10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

☒  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended: December 31, 2020

OR

☐  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                        to                       

Commission File Number: 1-14066

SOUTHERN COPPER CORPORATION

(Exact name of registrant as specified in its charter)

Delaware	13-3849074
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

1440 East Missouri Avenue Suite 160 Phoenix, AZ	85014
(Address of principal executive offices)	(Zip code)

Registrant’s telephone number, including area code: (602) 264-1375

Securities registered pursuant to Section 12(b) of the Act:

Title of each class:	Trading Symbol	Name of each exchange on which registered:
Common stock, par value $0.01 per share	SCCO	New York Stock Exchange Lima Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ⌧ No ◻

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ◻ No ⌧

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ⌧ No ◻

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ⌧ No ◻

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ⌧	Accelerated filer ◻	Non-accelerated filer ◻	Smaller reporting company ☐
			Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ◻

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. Yes ⌧ No ◻

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).  Yes ☐  No ⌧

At February 24, 2021, there were of record 773,073,269 shares of common stock, par value $0.01 per share, outstanding.

The aggregate market value of the shares of common stock (based upon the closing price at June 30, 2020 as reported on the New York Stock Exchange-Composite Transactions) of Southern Copper Corporation held by non-affiliates was approximately $3,411.6 million.

PORTIONS OF THE FOLLOWING DOCUMENTS ARE INCORPORATED BY REFERENCE:

Part III:	Proxy statement for 2021 Annual Meeting of Stockholders
Part IV:	Exhibit Index is on Page 171 through 173

Southern Copper Corporation (“SCC”)

INDEX TO FORM 10-K

		Page No.
PART I.
Item 1	Business	3 - 13
Item 1A	Risk factors	13 - 24
Item 1B	Unresolved Staff Comments	24
Item 2	Properties	24 - 24
Item 3	Legal Proceedings	63
Item 4	Mine Safety Disclosure	63
PART II.
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	64 - 66
Item 6.	Selected Financial Data	67 - 68
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	69 - 97
Item 7A.	Quantitative and Qualitative Disclosures about Market Risk	98 - 99
Item 8.	Financial Statements and Supplementary Data	100 - 162
Item 9.	Changes in and Disagreements with Accountant on Accounting and Financial Disclosure	163
Item 9A.	Controls and Procedures	163 - 165
Item 9B.	Other Information	165
PART III.
Item 10.	Directors, Executive Officers and Corporate Governance	166 - 167
Item 11.	Executive Compensation	166 - 167
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	166 - 167
Item 13.	Certain Relationships and Related Transactions and Director Independence	166 - 167
Item 14.	Principal Accounting Fees and Services	166 - 167
PART IV.
Item 15.	Exhibits, Financial Statement Schedule	168 - 170
	Supplemental information	171 - 173
	Signatures	174

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PART I

ITEM 1. BUSINESS

THE COMPANY

We believe Southern Copper Corporation (“SCC”, “Southern Copper” or the “Company”) is one of the largest integrated copper producers in the world. Our major production includes copper, molybdenum, zinc and silver. All of our mining, smelting and refining facilities are located in Peru and Mexico and we conduct exploration activities in those countries and in Argentina, Chile and Ecuador. See Item 2 “Properties—Review of Operations” for maps of our principal mines, smelting facilities and refineries. The considerable scale of our operations makes us one of the largest mining companies in Peru and Mexico. We believe we have the largest copper reserves in the world. We were incorporated in Delaware in 1952 and have conducted copper mining operations since 1960. Since 1996, our common stock has been listed on both the New York and Lima Stock Exchanges.

Our Peruvian copper operations involve mining, milling and flotation of copper ore to produce copper concentrates and molybdenum concentrates; the smelting of copper concentrates to produce blister and anode copper; and the refining of anode copper to produce copper cathodes. As part of this production process, we also produce significant amounts of molybdenum concentrate and sulfuric acid. Our precious metals plant at the Ilo refinery produces refined silver, gold, and other materials. Additionally, we produce refined copper using solvent extraction/electrowinning technology (“SX-EW”). We operate the Toquepala and Cuajone open-pit mines high in the Andes Mountains, approximately 860 kilometers southeast of the city of Lima, Peru. We also operate a smelter and refinery west of the Toquepala and Cuajone mines in the coastal city of Ilo, Peru.

Our Mexican operations are conducted through our subsidiary, Minera Mexico, S.A. de C.V. (“Minera Mexico”), which we acquired in 2005. Minera Mexico engages primarily in the mining and processing of copper, molybdenum, zinc, silver, gold and lead. Minera Mexico operates through subsidiaries that are grouped into three separate units. Mexicana de Cobre, S.A. de C.V. (together with its subsidiaries, the “La Caridad” unit) operates La Caridad, an open-pit copper mine, a copper ore concentrator, a SX-EW plant, a smelter, refinery and a rod plant. The La Caridad refinery has a precious metals plant that produces refined silver, gold and other materials. Operadora de Minas e Instalaciones Mineras, S.A de C.V. (the “Buenavista unit”) operates Buenavista, an open-pit copper mine, which is located on the site of one of the world’s largest copper ore deposits, two copper concentrators and two operating SX-EW plants. Industrial Minera Mexico, S.A. de C.V. (together with its subsidiaries, the “IMMSA unit”) operates five underground mines that produce zinc, lead, copper, silver and gold, and a zinc refinery.

We utilize modern, state of the art mining and processing methods, including global positioning systems and computerized mining processes. Our operations have a high level of vertical integration, which allows us to use our facilities, employees and equipment to manage the entire production process, including ore mining and production of refined copper rod and other products, and to execute most associated transport and logistics functions.

The sales prices for our products are largely determined by market forces beyond our control. Our management, therefore, focuses on cost control and production enhancement to remain profitable. We endeavor to achieve these goals through capital spending programs, exploration efforts and cost reduction programs. Our focus is on remaining profitable during periods of low copper prices and maximizing results in periods of high copper prices. For additional information on the sale prices of the metals we produce, please see “Metal Prices” in this Item 1.

Currency Information:

Unless stated otherwise, all our financial information is presented in U.S. dollars and any reference herein to “U.S. dollars,” “dollars,” or “$” are to U.S. dollars; references to “sol,” “soles” or “S/”, signify Peruvian soles; and references to “peso,” “pesos,” or “Ps.,” represent Mexican pesos.

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Unit Information:

Unless otherwise noted, all tonnages are in metric tons. To convert to short tons, multiply by 1.102. All ounces are troy ounces. All distances are in kilometers. To convert to miles, multiply by 0.621. To convert hectares to acres, multiply by 2.47.

ORGANIZATIONAL STRUCTURE

The following chart describes our organizational structure, starting with our controlling stockholders, as of December 31, 2020. For clarity purposes, the chart identifies only our main subsidiaries and eliminates intermediate holding companies.

We are a majority-owned, indirect subsidiary of Grupo Mexico S.A.B. de C.V. (“Grupo Mexico”). As of December 31, 2020, Grupo Mexico, through its wholly-owned subsidiary Americas Mining Corporation (“AMC”), owned 88.9% of our capital stock. Grupo Mexico’s principal business is to act as a holding company for the shares of other corporations engaged in the mining, processing, purchase and sale of minerals and other products and in the provision of railway and other related services.

We conduct our operations in Peru through a registered branch (the “SPCC Peru Branch”, “Branch” or “Peruvian Branch”). The SPCC Peru Branch comprises virtually all of our assets and liabilities associated with our copper operations in Peru. The SPCC Peru Branch does not constitute a corporation that is separate from SCC, and, as such, the obligations of the SPCC Peru Branch are direct obligations of SCC and vice-versa. The SPCC Peru Branch is, however, registered as a branch of a foreign company pursuant to Peruvian law and through this entity, we hold assets, incur liabilities and conduct operations in Peru. Although the SPCC Peru Branch has no capital or liability that is separate from that held or applicable to SCC, the SPCC Peru Branch is deemed to have equity capital for purposes of determining the economic interests of holders of our investment shares (See Note 14 “Stockholders´ Equity” of the consolidated financial statements).

In April 2005, we acquired Minera Mexico, from Americas Mining Corporation (“AMC”), a subsidiary of Grupo Mexico, our controlling stockholder. Minera Mexico is a holding company and all of its operations are conducted through subsidiaries that are grouped into three units: (i) the La Caridad unit (ii) the Buenavista unit and (iii) the IMMSA unit. We own 99.96% of Minera Mexico.

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In 2008, our Board of Directors (“BOD”) authorized a $500 million share repurchase program that has since been increased by the BOD and is currently authorized to $3 billion. Pursuant to this program, through December 31, 2020 we have purchased 119.5 million shares of our common stock at a cost of $2.9 billion. These shares are available for general corporate purposes. We may purchase additional shares from time to time, based on market conditions and other factors. This repurchase program has no expiration date and may be modified or discontinued at any time.

REPUBLIC OF PERU AND MEXICO

Our revenues are derived primarily from our operations in Peru and Mexico. Risks related to our operations in both countries include those associated with economic and political conditions, the effects of currency fluctuations and inflation, the effects of government regulations and the geographic concentration of our operations.

AVAILABLE INFORMATION

We file annual, quarterly and current reports, proxy statements and other information with the U.S. Securities and Exchange Commission (“SEC”). You may read and copy any document we file at the SEC’s Public Reference Room at 100 F Street NE, Washington, D.C. 20549. The SEC maintains a website that contains annual, quarterly and current reports, proxy statements and other information that issuers (including Southern Copper Corporation) file electronically with the SEC. The SEC’s website is www.sec.gov.

Our website is www.southerncoppercorp.com. The first document on the list of materials available on this website is Form 8-K, dated March 14, 2003. We offer, free of charge, downloads of our annual, quarterly and current reports, as soon as they can be reasonably made available following electronic or physical filing with the SEC. Our website also includes the Company’s Corporate Governance guidelines and the charters of our main Board Committees. However, the information found on our website is not part of this or any other report.

CAUTIONARY STATEMENT

Forward-looking statements in this report and in other Company statements include information regarding expected commencement dates of mining or metal production operations, projected quantities of future metal production, anticipated production rates, operating efficiencies, costs and expenditures, including taxes, as well as projected demand or supply for the Company’s products. Actual results could differ materially depending upon certain factors, including the risks and uncertainties relating to general U.S. and international economic and political conditions, the cyclical and volatile prices of copper, other commodities and supplies, including fuel and electricity, the availability of materials, insurance coverage, equipment, required permits or approvals and financing, the occurrence of unusual weather or operating conditions, lower than expected ore grades, water and geological problems, the failure of equipment or processes to operate in accordance with specifications, failure to obtain financial assurance to meet closure and remediation obligations, labor relations, litigation and environmental risks, as well as political and economic risk associated with foreign operations. Results of operations are directly affected by metal prices on commodity exchanges, which can be volatile.

Additional business information follows:

COPPER BUSINESS

Copper is an important component in the world’s infrastructure chain. It is the third most widely used metal, after iron and aluminum. Copper has unique chemical and physical properties, including high ductility; malleability; thermal and electrical conductivity; and resistance to corrosion, and as such, is considered a prime material for use in electrical and electronic products, including components for power transmission and generation, which accounts for about three quarters of copper global use, and for telecommunications, building construction, transportation and industrial machinery. Copper is also an important metal in non-electrical applications such as plumbing and roofing and, when alloyed with zinc to form brass, is used in many industrial and consumer applications.

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Copper is an internationally traded commodity whose prices are mainly determined by the major metal exchanges, the Commodities Exchange, or “COMEX,” in New York and the London Metal Exchange or “LME,” in London. Copper is usually found in nature in association with sulfur. Pure copper metal is generally produced in a multi-stage process, beginning with the mining and concentrating of low-grade ores containing copper sulfide minerals, and followed by smelting and electrolytic refining to produce a pure copper cathode. An increasingly larger share of copper is being produced from acid leaching of oxidized ores. Copper is one of the oldest metals known to man and has contributed significantly to the development of civilization.

BUSINESS REPORTING SEGMENTS:

Our management divides Southern Copper into three reportable segments and manages each as a separate segment.

The three segments identified are groups of individual mines, each of which constitutes an operating segment with similar economic characteristics, product types, processes and support facilities, regulatory environments, employee bargaining contracts and currency risks. In addition, each mine within the individual group earns revenues from similar types of customers for their products and services and each group incurs expenses independently, including commercial transactions between groups.

Inter-segment sales are based on arm’s length prices at the time of sale. These may not be reflective of actual prices realized by the Company due to various factors, including additional processing, timing of sales to outside customers and transportation cost. Information regarding the Company’s sales is included in the segment data. The segments identified by the Company are:

1. Peruvian operations, which include the Toquepala and Cuajone mine complexes and the smelting and refining plants, including a precious metals plant, industrial railroad and port facilities that service both mines. Sales of its products are recorded as revenue from our Peruvian mines. The Peruvian operations produce copper, by-products of molybdenum, silver and other materials.

2. Mexican open-pit operations, which include the La Caridad and Buenavista mine complexes and the smelting and refining plants, including a precious metals plant and a copper rod plant and support facilities that service both mines. Sales of its products are recorded as revenue of our Mexican mines. The Mexican open-pit operations produce copper, with production of by-products of molybdenum, silver and other materials.

3. Mexican underground mining operations, which include five underground mines that produce zinc, copper, lead, silver and gold; and a zinc refinery. This group is identified as the IMMSA unit and sales of its products are recorded as revenue from the IMMSA unit.

Financial information is periodically prepared for each of the three segments and the results are reported to the Chief Operating Decision Maker (“CODM”) on a segment basis. The CODM focuses on operating income and on total assets as measures of performance to evaluate different segments and to make decisions to allocate resources to the reported segments. These are common measures in the mining industry.

Segment information is included in Item 2 “Properties,” under the captions—“Metal Production by Segments” and “Ore Reserves.” More information on business segment and segment financial information is included in Note 18 “Segment and Related Information” of the consolidated financial statements.

CAPITAL INVESTMENT PROGRAM AND EXPLORATION ACTIVITIES

For a description of our capital investment program, see Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Capital Investment Program” and for our exploration activities, see Item 2 “Properties—Explorations Activities.”

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PRINCIPAL PRODUCTS AND MARKETS

Copper is primarily used in the building and construction industries; in the power generation and transmission industry; and in the electrical and electronic products; and, to a lesser extent, in industrial machinery and equipment; consumer products; and in the automotive and transportation industries. Molybdenum is used to toughen alloy steels and soften tungsten alloy and is also used in fertilizers, dyes, enamels and reagents. Silver is used for photographic, electrical and electronic products and, to a lesser extent, in brazing alloys and solder, jewelry, coinage, silverware and catalysts. Zinc is primarily used as a coating on iron and steel to protect against corrosion; it is also used to make die cast parts to manufacture batteries and to form sheets for architectural purposes.

Our marketing strategy and annual sales planning emphasize developing and maintaining long-term customer relationships. As such, acquiring annual or other long-term contracts for the sale of our products is a high priority. Generally, 80% to 90% of our metal production is sold under annual or longer-term contracts. Sales prices are determined based on the prevailing commodity prices for the quotation period according to the terms of the contract.

We focus on end-user customers as opposed to selling on the spot market or to trading companies. In addition, we devote significant marketing efforts to diversifying our sales both by region and customer base. We also strive to provide superior customer service, including timely deliveries of our products. Our ability to consistently fulfill customer demand is underpinned by our substantial production capacity.

For additional information on sales please see “Revenue recognition” in Note 2 “Summary of Significant Accounting Policies” and Note 18 “Segment and Related Information” of the consolidated financial statements.

METALS PRICES

Prices for our products are principally a function of supply and demand and, with the exception of molybdenum, are established on COMEX and LME. Prices for our molybdenum products are established by reference to the publication Platt’s Metals Week. Our contract prices also reflect any negotiated premiums and the costs of freight and other factors. From time to time, we have entered into hedging transactions to provide partial protection against future decreases in the market price of metals and we may do so under certain market conditions. For a further discussion of our products market prices, please see Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Metal Prices.”

The table below shows the high, low and average COMEX and LME per pound copper prices during the last 10 years:

	Copper (COMEX)			Copper (LME)
Year	High	Low	Average	High	Low	Average
2011	4.62	3.05	4.01	4.60	3.08	4.00
2012	3.97	3.28	3.61	3.93	3.29	3.61
2013	3.78	3.03	3.34	3.74	3.01	3.32
2014	3.43	2.84	3.12	3.37	2.86	3.11
2015	2.95	2.02	2.51	2.92	2.05	2.50
2016	2.69	1.94	2.20	2.69	1.96	2.21
2017	3.29	2.48	2.80	3.27	2.48	2.80
2018	3.29	2.56	2.93	3.29	2.64	2.96
2019	2.98	2.51	2.72	2.98	2.51	2.72
2020—1st Q	2.88	2.12	2.57	2.86	2.09	2.56
2020—2nd Q	2.71	2.21	2.43	2.74	2.16	2.42
2020—3rd Q	3.11	2.72	2.94	3.10	2.73	2.96
2020—4th Q	3.63	2.86	3.26	3.61	2.91	3.25
2020	3.63	2.12	2.80	3.61	2.09	2.80

The per pound COMEX copper price during the last 5 and 10 year periods averaged $2.69 and $3.00, respectively. The per pound LME copper price during the last 5 and 10 year periods averaged $2.70 and $3.00, respectively.

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The table below shows the high, low and average prices per pound with the exception of silver, which is priced per ounce. The market prices for our three principal by-products over the last 10 years are as follows:

				Molybdenum (Dealer
				Oxide Platt’s
	Silver (COMEX)			Metals Week)			Zinc (LME)
Year	High	Low	Average	High	Low	Average	High	Low	Average
2011	48.58	26.81	35.18	17.88	12.70	15.33	1.15	0.79	0.99
2012	37.14	26.25	31.19	14.80	10.90	12.62	0.99	0.80	0.88
2013	32.41	18.53	23.82	11.95	9.12	10.26	0.99	0.81	0.87
2014	22.05	15.39	19.04	15.05	8.75	11.30	1.10	0.88	0.98
2015	18.35	13.67	15.68	9.40	4.30	6.59	1.09	0.66	0.88
2016	20.67	13.74	17.10	8.60	5.10	6.42	1.32	0.73	0.95
2017	18.49	15.37	17.03	10.25	6.85	8.13	1.53	1.00	1.31
2018	17.55	13.95	15.65	13.00	10.60	11.86	1.64	1.04	1.33
2019	19.39	14.28	16.16	12.70	8.28	11.27	1.37	0.90	1.16
2020—1st Q	18.87	11.74	16.87	10.90	7.80	9.56	1.12	0.72	0.97
2020—2nd Q	18.77	13.93	16.54	9.10	7.33	8.24	0.94	0.84	0.89
2020—3rd Q	29.25	18.13	24.59	8.45	7.00	7.57	1.16	0.91	1.06
2020—4th Q	26.49	22.53	24.50	10.03	8.20	8.93	1.29	1.04	1.19
2020	29.25	11.74	20.62	10.90	7.00	8.57	1.29	0.72	1.03

The per ounce COMEX silver price during the last 5 and 10 year periods averaged $17.31 and $21.15, respectively. The per pound Platt’s Metals Week Dealer Oxide molybdenum price during the last 5 and 10 year periods averaged $9.25 and $10.23, respectively. The per pound LME zinc price during the last 5 and 10 year periods averaged $1.15 and $1.04, respectively.

COMPETITIVE CONDITIONS

Competition in the copper market is based primarily on price and service basis, with price being the most important factor when supplies of copper are ample. Our products compete with other materials, including aluminum and plastics. For additional information, see Item 1A “Risk Factors—The copper mining industry is highly competitive.”

HUMAN CAPITAL RESOURCES

As of December 31, 2020, we had 13,777 employees, approximately 71% of whom are unionized and represented by nine different labor unions. We believe that the labor environment in our operations in Mexico and Peru is favorable, which has allowed us to increase productivity as we advance the goals of our capital expansion program.

As a large integrated copper producer, we have a wide range of employees, including management professionals, technicians, engineers, and production employees.  In Peru and Mexico we provide a wide variety of opportunities for professional growth for all employees with trainings and on-the-job experience. As of December 31, 2020, approximately 6.5% of our total workforce was female.

The Company seeks to create value for its employees to ensure that their working experience is optimal. Various efforts are made on this front, including promoting a safe and collaborative work environment and culture and ensuring employees continue to be engaged with the Company’s values and principles. We believe that this generates the bases for shared values and improves our employer brand for existing and future employees. We also focus on attracting and retaining employees by providing compensation and benefit packages that are competitive within the applicable market, taking into account the location of the position, responsibilities and compensation requirements in the countries where we operate. Our compensation practices consider many factors, including individual performance and responsibilities; years of service; elements of compensation mandated by Peruvian and Mexican law; future challenges and objectives; contributions to the future success of our Company; the employee’s total compensation and our financial performance. We may also look at the compensation levels of comparable companies.

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In 2020, in response to COVID-19, we incurred $27.6 million in COVID-19 related production costs, which included protective equipment and labor costs to support employees where operations were impacted; expanding, where possible, options for remote work; and enhancing safety protocols. For additional information, refer to Item 7: Management’s Discussion and Analysis of Financial Condition and Results of Operations and Note 1 “Description of the Business, COVID-19 Pandemic” to the consolidated financial statements.

In terms of corporate culture, the Company is committed to the continuous growth and development of its employees and surrounding communities. Through values such as creativity, honesty, equality and respect, we ensure that our employees are aligned with the same principles and work ethics, which in turn results in a standardized culture across the Company. The Company also seeks to promote goal-oriented principles to obtain results that positively affect our main stakeholders and communities and which focus on innovation, human growth and wellbeing, environmental care, and forward thinking.

We deploy several talent attraction programs, which entail leveraging organizational relations; establishing links with national and regional institutions of higher learning in the countries where we operate; and participating in job fairs. We also have a careers page and use several local and international job boards to publish openings.

We offer professional internship programs to attract students before they graduate from universities or centers for vocational training. Additionally, we believe that we are a first-choice employer in the countries where we operate. This reflects our efforts to strengthen relationships with our stakeholders, including employees, and engage in community development. We have transparent selection processes and are committed to upholding principles for Human Rights and Diversity, Inclusion and Non-Discrimination.

All our employees receive initial training and opportunities for continuous development throughout their careers, which favors talent retention. We also prioritize recruiting from our ranks and 60% of our vacant positions, on average, are filled by current employees looking to make career moves.

Voluntary turnover indicators in all of the countries in which we operate remain at single digits year-over-year. We believe that this is proof that our employees have a strong desire to continue working with us.

In addition, we conduct a biannual Employee Opinion Survey to measure employees’ perceptions of the Company to take actions that will increase employee engagement. We have decided to measure the factors that affect our organizational climate, which entails assessing how people perceive of the environment inside the organization, and how internal and/or external factors generate impact, and focuses on culture, which reflects the aggregate of behaviors, experiences, habits, practices, values, procedures and policies inside the organization.

All employees, both unionized and non-unionized, are invited to participate in all of our human talent initiatives. This reflects our belief that it is in the Company’s best interest to listen to all of our people and create an open communications channel. We apply surveys every two years and approximately 70% of our employees participate. This number far exceeds that registered by other companies that apply similar surveys.

We measure the employee engagement level with 18 sub-factors, which are grouped into two major sets of factors: loyalty and satisfaction. The first factor represents the degree to which an individual identifies with the organization and its business goals, whereas the second reflects the individual’s degree of satisfaction with his/her working conditions and draws a line between satisfaction levels and performance at work.

The average of these factors indicates the level of engagement on a scale of 1 to 5 (a Likert scale). In 2017, we had an engagement rating of 3.71 and in 2019, our rating was situated at 3.77. This represents a 1.6% improvement from 2017 to 2019.

We have adopted a corporate social responsibility policy that is designed to integrate the Company´s operations with local communities in areas influenced by our operations. This policy focuses on creating permanent and positive relationships to generate optimal social conditions and promote sustainable development in the area. We continue to make significant expenditures for community programs.  For additional information on our community programs, refer to Corporate Social Responsibility under Note 13 “Commitments and contingencies” to the consolidated financial statements.

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Peru

66% of the Company’s 4,739 Peruvian employees were unionized as of December 31, 2020. Currently, there are six separate unions, one large union and five small unions. In June 2018, the Company signed a three-year collective bargaining agreement with one of the smaller unions. This agreement includes, among other things, annual salary increases of 5% for each year starting September 2018, and a signing bonus of S/45,000 (approximately $13,600) which was recorded as labor expense. In August 2018, the Company signed a three-year collective bargaining agreement with three additional unions. This agreement includes, among other things, annual salary increases of 5% for each year starting December 2018, and a signing bonus of S/45,000 (approximately $13,600) which was recorded as labor expense. In March 2019, the Company resolved pending issues through arbitration with one additional union. The arbitral award included annual salary increases of 5% for each year starting September 2018 and a signing bonus of S/45,000 (approximately $13,600), which was recorded as a labor expense in the first quarter of 2019.

In May 2019, arbitration resolved pending issues with the remaining union. The arbitral award included a salary increase of 5.5% beginning in September 2018 and a bonus of S/16,000 (approximately $4,800) for the one-year agreement, which was recorded as a labor expense in the second quarter of 2019. In November 2019, the Company signed a collective bargaining agreement for three years with the same union. This agreement included, among other things, a salary increase of 5% for each year starting in September 2019 and a bonus of S/45,000 (approximately $13,300), which was recorded as labor expenses in the fourth quarter of 2019.

Employees of the Toquepala and Cuajone units reside in townsites, where we have built 3,700 houses and apartments. We also have 90 houses in Ilo for staff personnel. Housing, together with maintenance and utility services, is provided at minimal cost to most of our employees. Our townsite and housing complexes include schools, medical facilities, churches, social clubs and recreational facilities. We also provide shopping, banking and other services at the townsites.

Mexico

74% of our 8,962 Mexican employees were unionized as of December 31, 2020 and are represented by three separate unions. Under Mexican law, the terms of employment for unionized workers are set forth in collective bargaining agreements. Mexican companies negotiate the salary provisions of collective bargaining agreements with the labor unions on an annual basis and negotiate other benefits every two years. We conduct negotiations separately at each mining complex and each processing plant.

Our Taxco mine in Mexico has been on strike since July 2007. For a discussion of labor matters, refer to the information contained under the caption “Labor matters” in Note 13 “Commitments and Contingencies” of the consolidated financial statements.

Employees of La Caridad and Buenavista units reside in townsites at Nacozari and Cananea, where we have built approximately 1,800 houses and apartments. Most of the employees of the IMMSA unit reside on the grounds of the mining or processing complexes where they work. We have built 356 houses and apartments on these sites. Housing, together with maintenance and utility services, is provided at minimal cost to most of our employees. Our townsites and housing complexes include educational and medical facilities, churches, social clubs, shopping centers, banking and other services. Through 2007, the Buenavista unit provided health care services to employees and retired unionized employees and their families through its own on-site hospital. In 2010, the Company signed an agreement with the Secretary of Health of the State of Sonora to provide these services to its retired workers and their families. The new workers of Buenavista receive health services through the Mexican Institute of Social Security as is the case for all Mexican workers.

FUEL, ELECTRICITY AND WATER SUPPLIES

The principal raw materials used in our operations are fuel, gas, electricity and water. We use natural gas to power boilers as well as generators and for metallurgical processes at our Mexican operations and utilize diesel fuel to power mining equipment. We believe that sufficient sources of fuel, electricity and water are readily available. Fluctuations

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may occur in the prices of these raw materials that are beyond our control; as such, we focus our efforts on reducing costs through cost and energy-saving measures.

Energy generates the main cost in mining, so concern for its conservation and efficient usage is critical. We have energy management committees at most of our mines, which meet periodically to discuss consumption and to develop measures directed at saving energy. Also, alternative sources are being analyzed at the corporate level, including both traditional and renewable energy sources. This approach has helped us to develop a culture of energy conservation directed at ensuring the sustainability of our operations.

Peru:

Fuel: In Peru, we obtain fuel primarily from local companies. The Company believes that adequate supplies of fuel are available in Peru.

Electricity: In June 2014, we entered into a power purchase agreement for 120 megawatt (“MW”) with the state company Electroperu S.A., which began supplying energy to our Peruvian operations for a twenty-year period that started on April 17, 2017. In July 2014, we entered into a power purchase agreement for 120MW with a private power generator Kallpa Generacion S.A. (“Kallpa”), which began supplying energy to our Peruvian operations for a ten-year period that started on April 17, 2017. In May 2016, we signed an additional power purchase agreement for a maximum of 80MW with Kallpa, under which Kallpa will supply energy to the operations related to the Toquepala expansion and to other minor projects for a period starting on May 1, 2017 and ending after ten years of commercial operations at the Toquepala Expansion or until April 30, 2029; whichever occurs first. We feel confident that additional power can be obtained from the Peruvian national grid, should the need arise.

Additionally, we have nine megawatts of power generation capacity from two small hydro-generating installations at Cuajone. Power is distributed over a 224-kilometer closed loop transmission circuit, which is connected to the Peruvian network.

Water: We have water rights or licenses for up to 1,950 liters per second from well fields at the Huaitire, Vizcachas and Titijones aquifers and surface water rights from Lake Suches and two small water sources, Quebrada Honda and Quebrada Tacalaya. We believe these water sources are sufficient to supply the needs of our operating units at Toquepala and Cuajone, including the Toquepala expansion. In Ilo, we have two desalination plants that produce water for industrial use and domestic consumption that we believe will produce sufficient water for both current and projected needs.

Mexico:

Fuel: In Mexico, since 2018, we have purchased fuel from Petroleos Mexicanos (“PEMEX”), the state producer, and from private suppliers.

The La Caridad unit imports natural gas from the United States through its pipeline (between Douglas, Arizona and Nacozari, Sonora). This allows us to import natural gas at market prices and thereby reduce operating costs. Several contracts with PEMEX and the United States provide us with the option of using a monthly or daily fixed prices for our natural gas purchases.

Natural gas is used for metallurgical processes and to power furnaces, converters, casting wheels, boilers and electric generators. Diesel oil is a backup method for all these uses. We use diesel oil to power mining equipment at our operations.

Electricity: Electricity is used as the main energy source at our mining complexes. We purchase most of our electricity from Mexico Generadora de Energia S. de R. L. (“MGE”), a subsidiary of Grupo Mexico which has two power plants designed to supply power to La Caridad and Buenavista units. MGE supplies 2.3% of its power output to third party energy users. These plants are natural gas-fired combined cycle power generating units, with a net total capacity of 516.2 megawatts. In 2012, we entered into a power supply agreement with MGE that will last until 2032. The first plant was

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completed in 2013 and the second in the second quarter of 2014. The first plant began to supply power to the Company in December 2013, and the second plant in June 2015.

We also purchase electricity from the Comision Federal de Electricidad (the Federal Electricity Commission or the “CFE”), the state’s electrical power producer. In addition, we recover some energy from waste heat boilers at the La Caridad smelter. Accordingly, a significant portion of our operating costs in Mexico is dependent upon the pricing policies of CFE and PEMEX, which are affected by political and regulatory environments, international market prices for crude oil and natural gas; and conditions in the refinery markets.

Some IMMSA mining operations also purchase electricity from Eolica el Retiro, S.A.P.I de C.V. (“Eolica”), a windfarm energy producer that is an indirect subsidiary of Grupo Mexico. In August 2013, IMMSA and other of the Company’s mining operations entered into a purchase agreement and in late 2014 started to purchase electricity from Eolica. Due to the nature of the production process there is not a fixed power capacity contracted. In 2020, total purchases were approximately 12.1 million kilowatt hours.

Water: In Mexico, water is deemed public property and industries that are not connected to a public service water supply must obtain a water concession from Comision Nacional del Agua (the National Water Commission or the “CNA”). Water usage fees are established in the Ley Federal de Derechos (the Federal Rights Law), which distinguishes several availability zones with different fees per unit of volume according to each zone, with the exception of Mexicana de Cobre. All of our operations have one or several water concessions and pump out the required water from wells. Mexicana de Cobre pumps water from the La Angostura dam, which is close to the mine and plants. At our Buenavista facility, we maintain our own wells and pay the CNA for water usage. Water conservation committees have been established at each plant to conserve and recycle water. Water usage fees are updated on a yearly basis and have been on the rise in recent years.

LEGAL AND REGULATORY MATTERS

In 2019 and 2020, no legal, environmental, labor or tax regulations came into effect that required the Company to incur material costs of compliance, had material adverse effects on the Company’s operations, or affected normal execution of the Company’s projects. Additionally, we believe that all our facilities in Peru and Mexico are in material compliance with applicable environmental, mining and other applicable laws and regulations.

For a discussion of environmental and labor matters, reference is made to the information contained in Note 13 “Commitments and Contingencies” of the consolidated financial statements. For more information on tax matters, refer to Note 7 “Income taxes” of the consolidated financial statements.

MINING RIGHTS AND CONCESSIONS

Peru:

We have 150,321 hectares in concessions from the Peruvian government for our exploration, exploitation, extraction and production operations, at various sites, as follows:

	Toquepala	Cuajone	Ilo	Other	Total
	(hectares)
Plants	360	919	421	—	1,700
Operations	27,342	21,555	4,882	35,590	89,369
Exploration	—	—	—	59,252	59,252
Total	27,702	22,474	5,303	94,842	150,321

We believe that our Peruvian concessions are in full force and effect under applicable Peruvian laws and as such, comply with all material terms and requirements applicable to said concessions. The concessions have indefinite terms, subject to our payment of concession fees of up to $3.00 per hectare annually for the mining concessions and a fee based on nominal capacity for the processing concessions. Fees paid during 2020, 2019 and 2018, were approximately

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$1.4 million, $1.8 million and $1.5 million, respectively. We have two types of mining concessions in Peru: metallic and non-metallic concessions.

In 2011, the Peruvian Congress approved an amendment to the mining royalty charge. The new mining royalty charge is based on operating income margins with graduated rates ranging from 1% to 12% of operating profits; the minimum royalty charge is equivalent to 1% of net sales. If the operating income margin is 10% or less, the royalty charge is 1% and for each 5% increment in the operating income margin, the royalty charge rate increases by 0.75%, up to a maximum of 12%. In 2020, 2019 and 2018, we made provisions of $60.6 million, $42.3 million and $32.9 million, respectively.

At the same time the Peruvian Congress amended the mining royalty charge, it enacted a new tax for the mining industry. This tax is also based on operating income and its rates range from 2% to 8.4%. For additional information see Note 7 “Income Taxes” to the consolidated financial statements.

Mexico:

In Mexico we have 503,104 hectares in concessions from the Mexican government for our exploration and exploitation activities as outlined on the table below:

	IMMSA	La Caridad	Buenavista	Projects	Total
	(hectares)
Mine concessions	176,643	103,821	93,706	128,934	503,104

We believe that our Mexican concessions are in full force and in effect under applicable Mexican laws and that we are in compliance with all material terms and requirements applicable to these concessions. Under Mexican law, mineral resources belong to the Mexican nation and a concession from the Mexican federal government is required to explore or mine mineral reserves. Mining concessions have a 50-year term that can be renewed for another 50 years. Holding fees for mining concessions can be from $0.36 to $7.92 per hectare depending on the start date of the mining concession. Fees paid during 2020, 2019 and 2018 were approximately $6.6 million, $7.1 million and $6.3 million, respectively. In addition, all of our operating units in Mexico have water concessions that are in full force and effect. Although ownership is not required in order to explore or mine a concession, we generally own the land related to our Mexican concessions. We also own all of the processing facilities of our Mexican operations and the land on which they are built.

In December 2013, the Mexican government enacted a new law which, among other things, established a mining royalty charge of 7.5% on earnings before taxes as defined by Mexican tax regulations and an additional royalty charge of 0.5% over gross income from sales of gold, silver and platinum. These charges were effective January 2014 and are deductible for income tax purposes.

ITEM 1A. RISK FACTORS

Every investor or potential investor in Southern Copper Corporation should carefully consider the following risk factors.

Financial risks

Our financial performance is highly dependent on the price of copper and the other metals we produce.

Our financial performance is significantly affected by the market prices of the metals that we produce, particularly the market prices of copper, molybdenum, zinc and silver. Historically, these prices have been subject to wide fluctuations and are affected by numerous factors beyond our control, including international economic and political conditions, levels of supply and demand, the availability and costs of substitutes, inventory levels maintained by users, actions of participants in the commodities markets and currency exchange rates. In addition, the market prices of copper and certain other metals have on occasion been subject to rapid short-term changes. In 2020, the COVID-19 pandemic and consequent negative impact on the global economy created significant volatility in the financial markets, including the copper market.

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Over the last three years, approximately 81% of our revenues came from the sale of copper; 7% from molybdenum; 5% from silver; and 4% from zinc. Please see the distribution of our revenues per product on Item 8 “Financial Statements and Supplementary Data” Note 18 “Segment and Related Information—Sales value per segment” on page 157.

See also historical average price of our products on Item 1 Business caption “Metals prices”.

We cannot predict if metals prices will rise or fall in the future. Future declines in metals prices, and for copper in particular, will have an adverse impact on our results of operations and financial condition. Under very adverse market conditions, we might consider curtailing or modifying some of our mining and processing operations.

Our business requires levels of capital investments that we may not be able to maintain.

Our business is capital intensive. Specifically, the exploration and exploitation of copper and other metal reserves, mining, smelting and refining costs, the maintenance of machinery and equipment and compliance with laws and regulations require significant capital investments. We must continue to invest capital to maintain or increase the amount of copper reserves that we exploit and the amount of copper and other metals we produce. We cannot assure you that we will be able to maintain our production at levels that generate sufficient cash, or that we will have access to sufficient financing to continue our exploration, exploitation and refining activities at or above present levels.

Restrictive covenants in the agreements governing our indebtedness and the indebtedness of our Minera Mexico subsidiary may restrict our ability to pursue our business strategies.

Our financing instruments and those of our Minera Mexico subsidiary include financial and other restrictive covenants that, among other things, limit our and Minera Mexico’s abilities to incur additional debt and sell assets. If either we or our Minera Mexico subsidiary fails to comply with these obligations, we could be in default under the applicable agreements. This situation, if not addressed or waived, could require immediate repayment of debt obligations. Our Minera Mexico subsidiary is further limited by the terms of its outstanding notes, which also restrict the Company’s applicable incurrence of debt and liens. In addition, future credit facilities may contain limitations on our capacity to incur additional debt and liens; dispose of assets; or pay dividends to our common stockholders.

We may not pay a significant amount of our net income as cash dividends on our common stock in the future.

We have distributed a significant amount of our net income as dividends since 1996. Our dividend practice is subject to change at the discretion of our Board of Directors at any time. The amount that we pay in dividends is subject to a number of factors, including the results of our operations; our financial condition; cash requirements; tax considerations; future prospects; legal restrictions; contractual restrictions in credit agreements; limitations imposed by the government of Peru, Mexico or other countries where we have significant operations; and other factors that our Board of Directors may deem relevant. Depending on our capital investment program and global economic conditions, it is possible that future dividend distributions will fall below levels seen in recent years.

Our ability to recognize the benefits of deferred tax assets is dependent on future cash flows and taxable income.

Through 2020, the Company recognized the expected future tax benefit from deferred tax assets when the tax benefit was considered more likely than not to be realized. Assessing the recoverability of deferred tax assets requires management to make significant estimates related to expectations of future taxable income and existing tax laws. There can be no assurance that the Company will be able to recognize the expected future benefits of deferred tax assets; this inability could have a material adverse effect on the Company’s results of operations.

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Operational risks

Our actual reserves may not conform to our current estimates of our ore deposits and our long-term viability depends on our ability to replenish ore reserves.

There is a degree of uncertainty attributable to the calculation of reserves. Until reserves are actually mined and processed, the quantity of ore and grades must be considered as estimates only. The proven and probable ore reserves data included in this report are estimates prepared by us based on evaluation methods generally used in the mining industry. We may be required in the future to revise our reserves estimates based on our actual production. We cannot assure you that our actual reserves conform to geological, metallurgical or other expectations or that the estimated volume and grade of ore will be recovered. Market prices of our metals, increased production costs, reduced recovery rates, short-term operating factors, royalty charges and other factors may render proven and probable reserves uneconomic to exploit and may result in revisions of reserves data from time to time. Reserves data are not indicative of future results of operations. Our reserves are depleted as we mine. We depend on our ability to replenish our ore reserves for our long-term viability. We use several strategies to replenish and increase our ore reserves, including exploration and investment in properties located near our existing mine sites and investing in technology that could extend the life of a mine by allowing us to cost-effectively process ore types that were previously considered uneconomic. Acquisitions may also contribute to increasing ore reserves and we review potential acquisition opportunities on a regular basis. However, we cannot assure you that we will be able to continue with our strategy to replenish reserves indefinitely.

Our operations are subject to risks, some of which are not insurable.

The business of mining, smelting and refining copper, zinc and other metals is subject to a number of risks and hazards, including industrial accidents, labor disputes, unusual or unexpected geological conditions, changes in the regulatory environment, environmental hazards, weather and other natural phenomena, such as seismic activity, wall failures and rock slides in our open-pit mines, structural collapses of our underground mines or tailings impoundments, and lower than expected ore grades or recovery rates. The Company’s operations may also be affected by mudslides and flash floods caused by torrential rains.

Such occurrences could result in damage to, or destruction of, mining operations resulting in monetary losses and possible legal liability. In particular, surface and underground mining and related processing activities present inherent risks of injury to personnel, loss of life and damage to equipment.

The waste rock and tailings produced in our mining operations represent our largest volume of waste material. Managing the volume of waste rock and tailings presents significant environmental, safety and engineering challenges and risks. We maintain large tailings impoundments containing sand of ground rock, moistened with water, which are effectively large dams that must be engineered, built and monitored to assure structural stability and avoid leakages or structural collapse. Defects, errors and failures at tailings dams and in other impoundments at any of our mining operations could cause severe property and environmental damage and loss of life. The importance of careful design, management and monitoring of large impoundments was emphasized in recent years by large scale tailings dam failures at unaffiliated mines, which caused extensive property and environmental damage and resulted in the loss of life. For more information regarding our tailing dams, please see Item 2 “Properties—Slope Stability—Tailing Dams.”

We maintain insurance against many of these and other risks, which under certain circumstances may not provide adequate coverage. Insurance against certain risks, including certain liabilities for environmental damage or hazards as a result of exploration and production, is not generally available to us or other companies within the mining industry. Nevertheless, recent environmental legal initiatives contemplate requirements for environmental damage insurance. If these regulations come into force, we will have to analyze the need to obtain said insurance. We do not have, and do not intend to obtain, political risk insurance. We cannot assure you that these and other uninsured events will not have an adverse effect on our business, properties, operating results, financial condition or prospects.

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Changes in the demand level for our products and copper sales agreements could adversely affect our revenues.

Our financial results may be affected by fluctuations in demand for the refined, semi-refined metal products and concentrates we sell at both the industrial and consumer level, and may also be affected by changes in the global economy, including economic upturns and downturns of differing magnitudes. Changes in technology, industrial processes, concerns over weaknesses in the global economy and consumer habits may affect the level of demand to the extent that those increase or decrease the need for our metal products. Our revenues may also be adversely affected by events of force majeure that could have a negative impact on our sales agreements. These events include acts of nature, labor strikes, fires, floods, wars, transportation delays, government actions or other events that are beyond the control of the parties to the agreement.

Interruptions of energy supply or increases in energy, fuel and gas costs, shortages of water supply, critical parts, equipment, skilled labor and other production costs may adversely affect our results of operations.

We require substantial amounts of fuel oil, electricity, water and other resources for our operations. Fuel, gas and power costs constituted approximately 28% of our total production cost in 2020 and 2019, and 29% in 2018. We rely upon third parties for our supply of the energy resources consumed in our operations so that prices for and availability of energy resources may be subject to change or curtailment due to, among other things, new laws or regulations; imposition of new taxes or tariffs; interruptions in production by suppliers; and variations in global prices or market conditions. Regarding water consumption, although each operation currently has sufficient water rights to cover its operational demands, the loss of some or all water rights for any of our mines or operations, in whole or in part, or shortages relative to the water to which we have rights could require us to curtail or shut down mining production and could prevent us from pursuing expansion opportunities. In addition, future shortages of critical parts, equipment and skilled labor could adversely affect our operations and development projects.

Our Company is subject to health and safety laws that may restrict our operations, result in operational delays or increase our operating costs and adversely affect our financial results of operations.

We are required to comply with occupational health and safety laws and regulations in Peru and Mexico where our operations are subject to periodic inspections by the relevant governmental authorities. These laws and regulations govern, among others, health and safety workplace conditions, including high risk labor and the handling, storage and disposal of chemical and other hazardous substances. We believe our operations comply in all material respects with applicable health and safety laws and regulations in the countries in which we operate. Compliance with these laws and regulations and with new or existing regulations that may be applicable to us in the future could increase our operating costs and adversely affect our financial results of operations and cash flows.

Our objective is to preserve the health and safety of our workforce by implementing occupational health and training programs and safety incentives at our operations that meet all regulatory requirements and enhance employee performance. Despite the Company’s efforts, we are not exempt from accidents. These are reported to Mexican and Peruvian authorities as required. Regarding non-fatal accidents, in the last three years, the Company’s Dart rate (rate to measure workplace injuries severe enough to warrant Day Away from work, job Restrictions and/or job Transfers) was much lower than the MSHA Dart rate (the MSHA Dart rate is published by the U.S.’s Mine Safety and Health Administration, and is used as an industry benchmark).

In 2020 and 2018, no fatalities were reported at our operations in Mexico or Peru. Unfortunately, in 2019, we reported four fatalities in Mexico and Peru. The amounts paid to the Mexican and Peruvian authorities for reportable accidents had no adverse effects on our results. Under Mexican and Peruvian law penalties and fines for safety violations are generally monetary, but in certain cases may lead to the temporary or permanent shutdown of the affected facility or the suspension or revocation of permits or licenses. Additionally, violations of security and safety laws and regulations at our Peruvian operations can be considered criminal and punishable by a sentence of up to 10 years of prison.

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Our metals exploration efforts are highly speculative in nature and may be unsuccessful.

Metals exploration is highly speculative in nature. It involves many risks and is frequently unsuccessful. Once mineralization is discovered, it may take a number of years from the initial phases of drilling until production is possible, during which time the economic feasibility of production may change. Substantial expenditures must be made to determine proven and probable ore reserves; this requires drilling to establish the metallurgical processes that will be needed to extract the metals from the ore and, in the case of new properties, to construct mining and processing facilities. We cannot assure you that our exploration programs will result in expansion or replacement of current production with new proven and probable ore reserves.

Development projects have no operating history upon which we can base estimates of proven and probable ore reserves and estimates of future cash operating costs. Estimates are, to a large extent, based upon the interpretation of geological data obtained from drill holes and other sampling techniques and on feasibility studies that generate estimates of cash operating costs based upon anticipated tonnage and grades of ore to be mined and processed; the configuration of the ore body; expected recovery rates of the mineral from the ore; comparable facility and equipment operating costs; anticipated climatic conditions; and other factors. As a result, actual cash operating costs and economic returns based upon development of proven and probable ore reserves may differ significantly from those originally estimated. Moreover, significant decreases in actual or expected prices may mean reserves, once found, will be uneconomical to produce.

We may be adversely affected by challenges relating to slope stability.

Our open-pit mines get deeper as we mine them, presenting certain geotechnical challenges including the possibility of slope failure. If we are required to decrease pit slope angles or provide additional road access to prevent such a failure, our stated reserves could be negatively affected. Furthermore, hydrological conditions relating to pit slopes, renewal of material displaced by slope failures and increased stripping requirements could also negatively affect our stated reserves. We take actions in order to maintain slope stability, but we cannot assure you that we will not have to take additional action in the future or that our actions taken to date will be sufficient. Unexpected slope failures, or additional requirements to prevent slope failures, may negatively affect our results of operations and financial condition and may diminish our stated ore reserves.

We may be adversely affected by labor disputes.

In the last several years we have experienced a number of strikes or other labor disruptions that have had an adverse impact on our operations and operating results. As of December 31, 2020, unions represented approximately 71% of our workforce. Currently, we have labor agreements in effect for our Mexican and Peruvian operations.

Our Taxco mine in Mexico has been on strike since July 2007. It is expected that operations at this mine will remain suspended until these labor issues are resolved. In addition, workers at the San Martin mine were on strike from July 2007 to August 2018. After eleven years of an illegal stoppage, we resumed control of the San Martin mine in August 2018. The San Martin facilities deteriorated during this period and we undertook a major renovation in order to restart operations during the second quarter of 2019, with an estimated capital budget of $97.7 million. For additional information, see Item 2, “Properties—Mexican IMMSA Unit—San Martin and Taxco”, and Note 13, “Commitments and Contingencies—Labor matters”, to the consolidated financial statements.

We cannot assure you when the pending strike will be settled, or that in the future we will not experience strikes or other labor related work stoppages that could have a material adverse effect on our financial condition and results of operations.

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Our mining or metal production projects may be subject to additional costs due to community actions and other factors.

In recent years, worldwide mining activity has been pressured by neighboring communities for financial commitments to fund social benefit programs and infrastructure improvements. Our projects in Peru are not exempt from these pressures. Our Tia Maria project in Peru has experienced delays while trying to resolve issues with community groups.

It appears that in the Peruvian mining environment, it is becoming increasingly important to obtain acceptance from local communities for projects in their areas. This may entail demands for substantial investments in community infrastructure and upgrades that must be met in order to proceed with the mining projects.

We are confident that we will move forward with the Tia Maria project. However, we cannot assure you when and that we will incur no additional costs for community infrastructure and upgrades to obtain approval from the communities for current or future mining projects.

In addition, a number of collective action lawsuits and civil action lawsuits have been filed against the Company in Mexico through both federal courts and state courts in Sonora. A number of constitutional lawsuits have also been filed against various government authorities and against the Company. These lawsuits are seeking damages and demand remediation actions to restore the environment. The Company believes that it is not possible to determine the extent of the damages sought and believes the lawsuits are without merit. However, the Company cannot offer any assurances that the outcome of these lawsuits will not have adverse effects on the Company.

Environmental regulation, climate change and other regulations may increase our costs of doing business, restrict our operations or result in operational delays.

Our exploration, mining, milling, smelting and refining activities are subject to a number of Peruvian and Mexican laws and regulations, including environmental laws and regulations, and certain industry technical standards. Additional matters subject to regulation include, but are not limited to, concession fees, transportation, production, water use and discharge, power use and generation, use and storage of explosives, surface rights, housing and other facilities for workers, reclamation, taxation, labor standards, mine safety and occupational health.

Environmental regulations in Peru and Mexico have become increasingly stringent over the last decade and we have had to dedicate more time and money to compliance and remediation activities. Furthermore, the Mexican authorities have become more rigorous and stricter in enforcing Mexican environmental laws. We expect additional laws and regulations will be enacted over time with respect to environmental matters.

Please refer to Note 13 “Commitments and Contingencies—Environmental matters” of our financial statements for further information on this subject.

The potential physical impacts of climate change on our operations are highly uncertain and depend on the geographic location of our facilities. These may include changes in rainfall patterns, water shortages, changes in sea levels, storm patterns and intensities, and temperatures. These effects may adversely impact the cost, production and financial performance of our operations.

We monitor fluctuations in weather patterns in the areas where we operate. Aligned with government efforts, we are working to measure our carbon footprint to reduce our operations’ contributions to greenhouse gases. We also evaluate our water demand, as weather changes may result in increases or decreases that affect our needs.

Efforts to comply with more stringent environmental protection programs in Peru and Mexico and with relevant trade agreements could impose constraints on and imply additional costs for our operations; consequently, we may need to make significant investments in this regard in the future. We cannot assure you that current or future legislative, regulatory or trade developments will not have adverse effects on our business, properties, operating results, financial condition or prospects.

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Our mining and metal production projects may expose us to new risks.

Our Company is in the midst of a large expansion program, which may expose us to additional risks in terms of industrial accidents. While we believe our contractors employ safety standards and other procedures to ensure these projects are completed with proper governance, it is possible that increased activity at our sites could cause environmental accidents or endanger human life.

Our business depends upon information technology systems that may be adversely affected by disruptions, damage, failure and risks associated with implementation and integration.

Our operations depend upon information technology systems that may be subject to disruption, damage or failure from different sources, including, without limitation, installation of malicious software, computer viruses, security breaches, cyber-attacks and defects in design. In recent years, cybersecurity incidents have increased in frequency and include, but are not limited to, malicious software, attempts to gain unauthorized access to data and other electronic security breaches that could lead to disruptions in systems, unauthorized release of confidential or otherwise protected information and the corruption of data. In 2020, we experienced no material cybersecurity breaches in our systems.

However, given the unpredictability of the timing, nature and scope of information technology disruptions, we could potentially be subject to manipulation or improper use of our systems and networks, operational delays, situations that compromise confidential or otherwise protected information, destruction or corruption of data, security breaches, or financial losses from remedial actions, any of which could have a material adverse effect on the cash flows, competitive position, financial condition or results of our operations.

Other risks

Applicable law restricts the payment of dividends from our Minera Mexico subsidiary to us.

Our subsidiary, Minera Mexico, is a Mexican company and, as such, may pay dividends only out of net income that has been approved by shareholders. Shareholders must also approve the actual dividend payment, after mandatory legal reserves have been created and losses for prior fiscal years have been satisfied. These legal constraints may limit the ability of Minera Mexico to pay dividends to us, which in turn, may have an impact on our ability to pay stockholder dividends or to service debt.

Global and local market conditions, including the high competitiveness in the copper mining industry, may adversely affect our profitability.

Our industry is cyclical in nature and fluctuates with economic cycles. Therefore, we are subject to the risks arising from adverse changes in domestic and global economic and political conditions, such as lower levels of consumer and corporate confidence, lower business investment, higher unemployment, reduced income and asset values in many areas, currency volatility and limited availability of credit and access to capital. Additionally, we face competition from other copper mining and producing companies around the world. Along these lines, significant competition exists to acquire properties that produce or are capable of producing copper and other metals, and some of our main competitors have consolidated, which makes them more diversified than we are.

We cannot assure you that changes in market conditions, including competition, will not adversely affect our ability to compete in the future on the basis of price or other factors with companies that may benefit from future favorable trading or other arrangements.

We are controlled by Grupo Mexico, which exercises control over our affairs and policies and whose interests may be different from yours.

At December 31, 2020, Grupo Mexico owned indirectly 88.9% of our capital stock. Some of our officers and directors, and those of Minera Mexico, are also directors and/or officers of Grupo Mexico and/or of its affiliates. We cannot assure you that the interests of Grupo Mexico will not conflict with those of our minority stockholders.

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Grupo Mexico has the ability to determine the outcome of substantially all matters submitted for a vote to our stockholders and thus exercises control over our business policies and affairs, including the following:

● the composition of our Board of Directors and, as a result, any determinations of our Board with respect to our business direction and policy, including the appointment and removal of our officers;

● determinations with respect to mergers and other business combinations, including those that may result in a change of control;

● whether dividends are paid or other distributions are made and the amount of any dividends or other distributions;

● sales and dispositions of our assets;

● the amount of debt financing that we incur; and

● the approval of capital projects.

We cannot assure you that an increase in the financial obligations of Grupo Mexico or AMC, which may be attributable to financing or to other reasons, will not result in a scenario in which our parent corporations obtain loans, increase dividends or receive other funding from us.

In addition, we have in the past engaged in, and expect to continue engaging in, transactions with Grupo Mexico and its other affiliates that are related party transactions and may present conflicts of interest. For additional information regarding the share ownership of, and our relationships with, Grupo Mexico and its affiliates, see Note 17 “Related Party Transactions” to the consolidated financial statements.

Unanticipated litigation or negative developments in pending litigation or with respect to other contingencies may adversely affect our financial condition and results of operations.

We are currently, and may in the future become, subject to litigation, arbitration or other legal proceedings with other parties. If rulings are against the Company, these legal proceedings, or others that could be brought against us in the future, may adversely affect our financial position or prospects. For further detailed discussion of pending litigation, please see Note 13 “Commitment and Contingencies—Litigation matters” of the consolidated financial statements.

Developments in the United States, Europe and emerging market countries may adversely affect the Company business, our common stock price and our debt securities.

The business and market value of securities of companies with significant operations in Peru and Mexico is, to varying degrees, affected by the economic policies and market conditions in the United States, Europe and emerging market countries. Although economic policies and conditions in these countries may significantly differ from policies and conditions in Peru or Mexico, the business community’s reactions to developments in any of these countries may adversely affect the Company business or the market value or trading price of securities, including debt securities, of issuers that have significant operations in Peru or Mexico.

In addition, in recent years economic conditions in Mexico have shown increased correlation to U.S. economic conditions. Therefore, changes in economic policies and conditions in the United States could also have a significant adverse effect on Mexican economic conditions, affecting our business, the price of our common stock or debt securities. In 2017, the United States, Canada and Mexico began a discussion to update the North American Free Trade Agreement (“NAFTA”). In September 2018, the three countries reached an agreement on a new trade deal, which will be known as the United States—Mexico—Canada Agreement (“USMCA”). In June 2019, Mexico’s senate ratified the UMSCA. In December 2019, the three countries agreed to a new review of its regional trade pact, also concluding that the USMCA would replace NAFTA. On January 29, 2020, the U.S. ratified the USMCA and its President signed the USMCA into law. On July 1, 2020, the USMCA came into effect.

Although recent developments in the U.S. have reduced political instability, lifted consumer confidence and boosted the U.S. stock market, it is unclear if the U.S. government will enact new policies with regard to China that will reduce or eliminate trade tensions between the two countries. Despite being the COVID-19 pandemic epicenter, China began 2021 with a relatively optimistic economic growth outlook. A slowing in China’s economic growth and copper demand and continued trade tensions between the U.S. and China could result in lower copper prices which could have a material

20

adverse impact on our business and results of operations. The adoption and expansion of trade restrictions; changes in the state of China-U.S. relations, including on-going trade tensions; or other governmental action related to taxes, tariffs, trade agreements or other policies are difficult to predict, and could adversely affect demand for our products, our costs, our customers, our suppliers and the U.S. economy, and consequently, could have a material adverse effect on our cash flows, competitive position, financial condition or results of operations.

Additionally, there is uncertainty in global markets due to the June 2016 referendum in the United Kingdom, which resulted in a vote to leave the European Union (“Brexit”). In December of 2020, the United Kingdom left the European Union after an 11-month transition period that started in January. Brexit may adversely affect global political, regulatory, economic and market conditions, including capital markets and foreign exchange markets, which could adversely affect our business, financial condition and results of operations. It is likely that instability and volatility will continue in global financial markets until the terms of certain mechanisms of Brexit are clear.

We cannot assure you that the market value or trading prices of our common stock and debt securities, will not be adversely affected by events in the United States or elsewhere, including emerging market countries.

Other international risks

We are a company with substantial assets located outside of the United States. We conduct production operations in Peru and Mexico and exploration activities in these countries as well as in Chile, Argentina and Ecuador. Accordingly, in addition to the usual risks associated with conducting business in foreign countries, our business may be adversely affected by political, economic and social uncertainties in each of these countries. Such risks include possible expropriation or nationalization of property, confiscatory taxes or royalties, possible foreign exchange controls, changes in the national policy toward foreign investors, extreme environmental standards, etc.

Our international operations must comply with the U.S. Foreign Corrupt Practices Act and similar anti-corruption and anti-bribery laws in the other jurisdictions in which we operate. There has been a substantial increase in global enforcement of these laws in recent years. As such, our corporate policies and processes may not prevent or detect all potential breaches of law. Any violation of those laws could result in significant criminal or civil fines and penalties, litigation, and loss of operating licenses or permits, and may damage our reputation, which could have a material adverse effect on our cash flows, results of operations and financial condition.

Our insurance does not cover most losses caused by the aforementioned risks. Consequently, our production, development and exploration activities in these countries could be substantially affected by factors out of our control, some of which could materially and adversely affect our financial position or results of operations.

We may be adversely affected by natural disasters, pandemics (including the recent coronavirus outbreak) and other catastrophic events, and by man-made problems such as terrorism, which could disrupt our business operations and our business continuity; additionally, disaster recovery plans may not adequately protect us from a serious disaster.

Natural disasters, adverse weather conditions, floods, pandemics (including the recent coronavirus outbreak), acts of terrorism and other catastrophic or geo-political events may cause damage or disruption at our operations and in international commerce as well as the global economy, and could have an adverse effect on our business, operating results, and financial condition.

Our results of operations may be materially adversely impacted by the ongoing coronavirus pandemic (COVID-19).

The global spread of the coronavirus (COVID-19) has created significant volatility, uncertainty and economic disruption. Since the outbreak of the COVID-19 emerged in early 2020, it has quickly spread across the world.

The ongoing COVID-19 pandemic, coupled with the possibility that other pandemics may potentially arise in the future, represent significant risks for the Company, which include but are not limited to:

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a) supply chain disruptions that make it difficult for the Company to order and receive the materials needed to produce

its products and to ship finished products to our end customers,

b) financial risks pertaining to receivables due from customers that may become insolvent or otherwise unable to

meet their financial obligations,

c) government responses, including mandates that make it difficult to remain open for business; restrict imports of raw

materials or exports of finished goods; prohibit the Company’s products from being sold in their countries, and other

seen and unforeseen actions taken by government entities,

d) absenteeism or loss of employees at our Company, or at our affiliated companies, which involves workers needed to develop, validate, manufacture and perform other necessary functions for our operations, whether due to health reasons or government restrictions,

e) equipment failures due to maintenance postponements, loss of utilities and other disruptions that could impact our

operations or render them inoperable,

f) litigation or government actions against the Company,

g) a local or global recession or depression that could harm the international banking system, limiting demand for all

products, including those made by the Company,

h) disruption of banking and financial institutions, which may limit access to loans, and

i) many other seen and unforeseen events and circumstances, all of which could negatively impact the Company.

Risks Associated with Doing Business in Peru and Mexico

There is uncertainty as to the termination and renewal of our mining concessions.

Under the laws of Peru and Mexico, mineral resources belong to the state and government and concessions are required in both countries to explore for or exploit mineral reserves. In Peru, our mineral rights derive from concessions from Ministry of Energy and Mines (“MINEM”) for our exploration, exploitation, extraction and/or production operations. In Mexico, our mineral rights derive from concessions granted, on a discretionary basis, by the Ministry of Economy, pursuant to Mexican mining law and regulations thereunder.

Mining concessions in both Peru and Mexico may be terminated if the obligations of the concessioner are not satisfied. In Peru, we are obligated to pay certain fees for our mining concession. In Mexico, we are obligated, among other things, to explore or exploit the relevant concession, to pay any relevant fees, to comply with all environmental and safety standards, to provide information to the Ministry of Economy and to allow inspections by the Ministry of Economy. Any termination or unfavorable modification of the terms of one or more of our concessions, or failure to obtain renewals of such concessions subject to renewal or extensions, could have a material adverse effect on our financial condition and prospects.

Peruvian economic and political conditions may have an adverse impact on our business.

A significant portion of our operations is conducted in Peru. Accordingly, our business, financial condition or results of operations could be affected by changes in economic or other policies of the Peruvian government or other political, regulatory or economic developments in the country. Over the past several decades, Peru has had a succession of regimes with differing policies and programs. In the twentieth century, past governments have frequently intervened in the nation’s economy and social structure. Among other actions, past governments have imposed controls on prices, exchange rates and local and foreign investments; placed limitations on imports; restricted companies’ abilities to dismiss employees and have prohibited the remittance of profits to foreign investors.

In 2019 and 2020, Peru continued to experience heightened political instability in a context marked by ongoing investigations into allegations of corruption (Operation Car Wash investigation) and confrontation on the political scene. Significant political turmoil in Peru led to a shutdown of the Peruvian Congress and the removal of two Peruvian presidents.

Because we have significant operations in Peru, we cannot provide any assurance that political developments and economic conditions, including any changes to economic policies or the adoption of other reforms proposed by existing

22

or future administrations, in Peru and/or other factors will have no material adverse effects on market conditions, the prices of our securities, our ability to obtain financing, our results of operations, or our financial condition.

Mexican economic and political conditions, as well as drug-related violence, may have an adverse impact on our business.

The Mexican economy is highly sensitive to economic developments in the United States, mainly because of its high level of exports to this market. Other risks in Mexico are increases in taxes on the mining sector and higher royalties, such as those enacted in 2013. As has occurred in other metal producing countries, the mining industry may be perceived as a source of additional fiscal revenue.

In addition, public safety organizations in Mexico are under significant stress, as a result of drug-related violence. This situation creates potential risks, particularly for transportation of minerals and finished products, which may affect a small portion of our production. Drug-related violence has had a limited impact on our operations, as it has tended to concentrate outside of our areas of production. The potential risks to our operations might increase if the violence spreads to our areas of production.

Because we have significant operations in Mexico, we cannot provide any assurance that political developments and economic conditions, including any changes to economic policies or the adoption of other reforms proposed by existing or future administrations in Mexico, or the advent of drug-related violence in the country, will have no material adverse effect on market conditions, the prices of our securities, our ability to obtain financing, our results of operations or our financial condition.

Peruvian inflation and fluctuations in the sol exchange rate may adversely affect our financial condition and results of operations.

Although the U.S. dollar is our functional currency and our revenues are primarily denominated in U.S. dollars, as we operate in Peru, portions of our operating costs are denominated in Peruvian soles. Accordingly, when inflation or deflation in Peru is not offset by a change in the exchange rate of the sol, our financial position, results of operations, cash flows and the market price of our common stock could be affected.

Inflation in Peru in 2020, 2019 and 2018 was 2.0%, 1.9% and 2.5%, respectively. The value of the sol depreciated against the U.S. dollar 9.3% and 4.1% in 2020 and 2018, respectively but it appreciated 1.8% in 2019. Although the Peruvian government’s economic policy reduced inflation and the economy has experienced significant growth in recent years, we cannot assure you that inflation will not increase from its current level or that such economic growth will continue in the future at similar rates or at all. Additionally, a global financial economic crisis could negatively affect the Peruvian economy.

To manage the volatility related to the risk of currency rate fluctuations, we may enter into forward exchange contracts. We cannot assure you, however, that currency fluctuations will not have an impact on our financial condition and results of operations.

Mexican inflation, restrictive exchange control policies and fluctuations in the peso exchange rate may adversely affect our financial condition and results of operations.

Although all of our Mexican operations’ sales of metals are priced and invoiced in U.S. dollars, a substantial portion of its costs are denominated in pesos. Accordingly, when inflation in Mexico increases without a corresponding depreciation of the peso, the net income generated by our Mexican operations is adversely affected. The annual inflation rate in Mexico was 3.2% in 2020, 2.8% in 2019 and 4.8% in 2018.

At the same time, the peso has been subject in the past to significant volatility, which may not have been proportionate to the inflation rate and may not be proportionate to the inflation rate in the future. The value of the peso relative to the U.S. dollar decreased by 5.9% in 2020, and it increased by 4.3% and 0.3% in 2019 and 2018, respectively.

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Currently, the Mexican government does not restrict the ability of Mexican companies or individuals to convert pesos into dollars or other currencies. While we do not expect the Mexican government to impose any restrictions or exchange control policies in the future, it is an area we closely monitor. We cannot assure you the Mexican government will maintain its current policies with regard to the peso or that the peso’s value will not fluctuate significantly in the future. The imposition of exchange control policies could impair Minera Mexico’s ability to obtain imported goods and to meet its U.S. dollar-denominated obligations and could have an adverse effect on our business and financial condition.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

ITEM 2. PROPERTIES

We were incorporated in Delaware in 1952. Our corporate offices in the United States are located at 1440 East Missouri Avenue Suite 160, Phoenix, Arizona 85014. Our Phoenix telephone number is (602) 264-1375. Our corporate offices in Mexico are located in Mexico City and our corporate offices in Peru are located in Lima. Our website is www.southerncoppercorp.com. We believe that our existing properties are in good condition and adequate to conduct of our business.

REVIEW OF OPERATIONS

The following maps show the locations of our principal mines, smelting facilities and refineries. We operate open-pit copper mines in the southern part of Peru—at Toquepala and Cuajone—and in Mexico, at La Caridad and Buenavista. We also operate five underground mines that produce zinc, copper, silver and gold.

EXTRACTION, SMELTING AND REFINING PROCESSES

Our operations include open-pit and underground mining, concentrating, copper smelting, copper refining, copper rod production, solvent extraction/electrowinning (“SX-EW”), zinc refining, sulfuric acid production, molybdenum concentrate production and silver and gold refining. The extraction and production process are summarized below.

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OPEN-PIT MINING

In an open-pit mine, the production process begins at the mine pit, where waste rock, leaching ore and copper ore are drilled and blasted and then loaded onto diesel-electric trucks by electric shovels. Waste is hauled to dump areas and leaching ore is hauled to leaching dumps. The ore to be milled is transported to the primary crushers.

UNDERGROUND MINING

In an underground mine, the production process begins at the stopes, where copper, zinc and lead veins are drilled and blasted and the ore is hauled to the underground crusher station. The crushed ore is then hoisted to the surface for processing.

CONCENTRATING

The copper ore with a copper grade over 0.4% from the primary crusher or the copper, zinc and lead-bearing ore from the underground mines is transported to a concentrator plant where gyratory crushers break the ore into sizes no larger than three-quarter of an inch. The ore is then sent to a mill section where it is ground to the consistency of fine powder. The finely ground ore is mixed with water and chemical reagents and pumped as a slurry to the flotation separator, where it is mixed with certain chemicals. In the flotation separator, reagent solutions and air pumped into the flotation cells cause the minerals to separate from the waste rock and bubble to the surface where they are collected and dried.

If the bulk concentrated copper contains molybdenum, it is first processed in a molybdenum plant as described below under “Molybdenum Production.”

COPPER SMELTING

Copper concentrates are transported to a smelter, where they are smelted using a furnace, converter and anode furnace to produce either blister copper (which is in the form of cakes with air pockets) or copper anodes (which are cleaned of air pockets). At the smelter, the concentrates are mixed with flux (a chemical substance intentionally included for high temperature processing) and then sent to reverberatory furnaces producing copper matte and slag (a mixture of iron and other impurities). Copper matte contains approximately 65% copper. Copper matte is then sent to the converters, where the material is oxidized in two steps: (i) the iron sulfides in the matte are oxidized with silica, producing slag that is returned to the reverberatory furnaces, and (ii) the copper contained in the matte sulfides is then oxidized to produce copper that, after casting, is called blister copper, containing approximately 98% to 99% copper, or anodes, containing approximately 99.7% copper. Most of the blister and anode production is sent to the refinery and the remainder is sold to customers.

COPPER REFINING

Anodes are suspended in tanks with a solution containing water, sulfuric acid and copper sulfate. A weak electrical current is passed through the anodes and chemical solution and the dissolved copper is deposited on very thin starting sheets to produce copper cathodes containing approximately 99.99% copper. During this process, silver, gold and other metals (for example, palladium, platinum and selenium), along with other impurities, settle on the bottom of the tank (anodic muds). This anodic mud is processed at a precious metal plant where selenium, silver and gold are recovered.

COPPER ROD PLANT

To produce copper rod, copper cathodes are first smelted in a furnace and then dosed in a casting machine. The dosed copper is then extruded and passed through a cooling system that begins solidification of copper into a 60×50 millimeter copper bar. The resulting copper bar is gradually stretched in a rolling mill to achieve the desired diameter. The rolled bar is then cooled and sprayed with wax as a preservation agent and collected into a rod coil that is compacted and sent to market.

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SOLVENT EXTRACTION/ELECTROWINNING (“SX-EW”)

A complementary processing method is the leaching and SX-EW process. During the SX-EW process, low-grade sulfides ore and copper oxides are leached with sulfuric acid to allow copper content recovery. The acid and copper solution is then agitated with a solvent that contains chemical additives that attract copper ions. As the solvent is lighter than water, it floats to the surface carrying with it the copper content. The solvent is then separated using an acid solution, freeing the copper. The acid solution containing the copper is then moved to electrolytic extraction tanks to produce copper cathodes.

MOLYBDENUM PRODUCTION

Molybdenum is recovered from copper-molybdenum concentrates produced at the concentrator. The copper-molybdenum concentrate is first treated with a thickener until it becomes slurry with 60% solids. The slurry is then agitated in a chemical and water solution and pumped to the flotation separator. The separator creates a froth that carries molybdenum to the surface but not the copper mineral (which is later filtered to produce copper concentrates containing approximately 27% copper). The molybdenum froth is skimmed off, filtered and dried to produce molybdenum concentrates of approximately 58% contained molybdenum.

ZINC REFINING

Metallic zinc is produced through electrolysis using zinc concentrates and zinc oxides. Sulfur is eliminated from the concentrates by roasting and the zinc oxide is dissolved in sulfuric acid solution to eliminate solid impurities. The purified zinc sulfide solution is treated by electrolysis to produce refined zinc and to separate silver and gold, which are recovered as concentrates.

SULFURIC ACID PRODUCTION

Sulfur dioxide gases are produced in the copper smelting and zinc roasting processes. As a part of our environmental preservation program, we treat the sulfur dioxide emissions at two of our Mexican plants and at our Peruvian processing facilities to produce sulfuric acid, some of which is, in turn, used for the copper leaching process; the balance is sold to mining and fertilizer companies located mainly in Mexico, Peru, United States and Chile.

SILVER AND GOLD REFINING

Silver and gold are recovered from copper, zinc and lead concentrates in the smelters and refineries and from slimes through electrolytic refining.

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KEY PRODUCTION CAPACITY DATA

We own all production facilities. The table below provides details on the locations of production facilities as of December 31, 2020 by reportable segment, the processes used, and the key production and capacity data for each location:

				2020	2020 Capacity
Facility Name	Location	Process	Nominal Capacity(1)	Production	Use(3)
PERUVIAN OPEN‑PIT UNIT
Mining Operations
Cuajone open‑pit mine	Cuajone (Peru)	Copper ore milling and recovery, copper and molybdenum concentrate production	90.0 ktpd—ore milled	82.5	91.7	%
Toquepala open‑pit mine; Concentrator I	Toquepala (Peru)	Copper ore milling and recovery, copper and molybdenum concentrate production	60.0 ktpd—ore milled	57.3	95.5	%
Concentrator II			60.0 ktpd—ore milled	52.0	86.7	%
Toquepala SX‑EW plant	Toquepala (Peru)	Leaching, solvent extraction and cathode electrowinning	56.3 ktpy—refined	26.0	46.2	%
Processing Operations
Ilo copper smelter	Ilo (Peru)	Copper smelting, blister, anodes production	1,200.0 ktpy—concentrate feed	1,210.6	100.9	%
Ilo copper refinery	Ilo (Peru)	Copper refining	294.8 ktpy—refined cathodes	286.3	97.1	%
Ilo acid plants	Ilo (Peru)	Sulfuric acid	1,817.55 ktpy—sulfuric acid	1,203.9	66.2	%
Ilo precious metals refinery	Ilo (Peru)	Slime recovery & processing, gold & silver refining	460 tpy	365.4	79.4	%
MEXICAN OPEN‑PIT UNIT
Mining Operations
Buenavista open‑pit mine; Concentrator I	Sonora (Mexico)	Copper ore milling & recovery, copper concentrate production	82.0 ktpd—milling	84.2	102.7	%
Concentrator II			100.0 ktpd—milling	115.3	115.3	%
Buenavista: SX‑EW plant I	Sonora (Mexico)	Leaching, solvent extraction & refined cathode electrowinning	11.0 ktpy—refined	—	—	%
SX‑EW plant II			43.8 ktpy—refined	25.9	59.1	%
SX‑EW plant III			120.0 ktpy—refined	72.3	60.3	%
La Caridad open‑pit mine	Sonora (Mexico)	Copper ore milling & recovery, copper & molybdenum concentrate production	94.5 ktpd—milling	95.5	101.1	%
La Caridad SX‑EW plant	Sonora (Mexico)	Leaching, solvent extraction & cathode electrowinning	21.9 ktpy—refined	25.8	118.0	%
Processing Operations
La Caridad copper smelter	Sonora (Mexico)	Concentrate smelting, anode production	1,000 ktpy—concentrate feed	1,029.5	102.9	%
La Caridad copper refinery	Sonora (Mexico)	Copper refining	300 ktpy copper cathode	240.4	80.1	%
La Caridad copper rod plant	Sonora (Mexico)	Copper rod production	150 ktpy copper rod	129.4	86.3	%
La Caridad precious metals refinery	Sonora (Mexico)	Slime recovery & processing, gold & silver refining	1.8 ktpy—slime	1.0	56.1	%
La Caridad sulfuric acid plant	Sonora (Mexico)	Sulfuric acid	1,565.5 ktpy—sulfuric acid	967.5	61.8	%
IMMSA UNIT
Underground mines
Charcas	San Luis Potosi (Mexico)	Copper, zinc, lead milling, recovery & concentrate production	1,460 ktpy—ore milled	1,145.9	78.5	%
San Martin	Zacatecas (Mexico)	Lead, zinc, copper & silver mining, milling recovery & concentrate production	1,606 ktpy—ore milled	1,355.1	84.4	%
Santa Barbara	Chihuahua (Mexico)	Lead, copper and zinc mining & concentrates production	2,190 ktpy—ore milled	1,732.6	79.1	%
Santa Eulalia	Chihuahua (Mexico)	Lead & zinc mining and milling recovery & concentrate production	547.5 ktpy—ore milled	8.5	1.6	%
Taxco(2)	Guerrero (Mexico)	Lead, zinc silver & gold mining recovery & concentrate production	730 ktpy—ore milled	—	—	%
Processing Operations
San Luis Potosi zinc refinery	San Luis Potosi (Mexico)	Zinc concentrates refining	105.0 ktpy zinc cathode	102.4	97.6	%
San Luis Potosi sulfuric acid plant	San Luis Potosi (Mexico)	Sulfuric acid	180.0 ktpy sulfuric acid	181.0	100.6	%

ktpd = thousands of tons per day

ktpy = thousands of tons per year

Tpy = tons per year

(1) Our estimates of actual capacity under normal operating conditions contemplating an allowance for normal downtime for repairs and maintenance and are based on the average metal content for the relevant period.

(2) The Taxco mine has been on strike since July 2007. The Company restored production at the San Martin mine in the second quarter of 2019.

(3) In some cases, real production exceeds nominal capacity due to higher grades and recovery rates.

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PROPERTY BOOK VALUE

As of December 31, 2020, net book values of property and mine development were as follows (in millions):

Peruvian operations:
Cuajone	$	722.5
Toquepala		1,908.5
Tia Maria project		333.6
Ilo and other support facilities		629.5
Construction in progress		611.3
Total Peru	$	4,205.4
Mexican open‑pit operations:
Buenavista mine and concentrator plants	$	2,271.9
Buenavista SX‑EW and Quebalix		1,032.4
La Caridad mine and concentrator plant		351.6
La Caridad support facilities		385.1
Construction in progress		420.5
Total Mexico Open Pit	$	4,461.5
Mexican IMMSA unit:
San Luis Potosi	$	113.2
Zinc electrolytic refinery		67.9
Charcas		70.6
San Martin		80.7
Santa Barbara		69.4
Taxco		2.9
Santa Eulalia		53.1
Nueva Rosita		29.4
Construction in progress and other facilities		66.2
Total IMMSA Unit	$	553.4
Other property:
El Pilar	$	87.9
Mexicana del Arco		50.6
Total	$	138.5
Mexican administrative offices	$	99.9
Total Mexico	$	5,253.3
Total Southern Copper Corporation	$	9,458.7

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SUMMARY OPERATING DATA

The following table contains certain operating data underlying our financial and operating information for each of the periods indicated.

				Variance
	Year Ended December 31,			2020 -2019			2019 -2018
	2020	2019	2018	Volume	%		Volume	%
COPPER (thousand pounds):
Mined
Peru open‑pit
Toquepala	505,116	510,752	316,849	(5,636)	(1.1)	%	193,903	61.2	%
Cuajone	371,837	344,787	354,016	27,050	7.8	%	(9,229)	(2.6)	%
SX‑EW Toquepala	57,342	58,045	58,480	(703)	(1.2)	%	(435)	(0.7)	%
Mexico open‑pit
La Caridad	241,783	236,249	233,882	5,534	2.3	%	2,367	1.0	%
Buenavista	735,398	745,073	716,239	(9,675)	(1.3)	%	28,834	4.0	%
SX‑EW La Caridad	56,981	57,160	58,232	(179)	(0.3)	%	(1,072)	(1.8)	%
SX‑EW Buenavista	216,470	220,711	196,788	(4,241)	(1.9)	%	23,923	12.2	%
IMMSA unit	22,711	18,222	13,715	4,489	24.6	%	4,507	32.9	%
Total Mined	2,207,638	2,190,999	1,948,201	16,639	0.8	%	242,798	12.5	%
Smelted
Peru open‑pit
Blister Ilo	9,177	—	5,799	9,177	100.0	%	(5,799)	(100.0)	%
Anodes Ilo	762,700	700,009	760,060	62,691	9.0	%	(60,051)	(7.9)	%
Mexico open‑pit
Anodes La Caridad	625,414	612,122	631,056	13,292	2.2	%	(18,934)	(3.0)	%
Total Smelted	1,397,291	1,312,131	1,396,915	85,160	6.5	%	(84,784)	(6.1)	%
Refined
Peru Open‑pit
Cathodes Ilo	631,118	565,810	645,191	65,308	11.5	%	(79,381)	(12.3)	%
SX‑EW Toquepala	57,342	58,045	58,480	(703)	(1.2)	%	(435)	(0.7)	%
Mexico Open‑pit
Cathodes La Caridad	529,997	510,602	527,306	19,395	3.8	%	(16,704)	(3.2)	%
SX‑EW La Caridad	56,981	57,160	58,232	(179)	(0.3)	%	(1,072)	(1.8)	%
SX‑EW Buenavista	216,470	220,712	196,788	(4,242)	(1.9)	%	23,924	12.2	%
Total Refined	1,491,908	1,412,329	1,485,997	79,579	5.6	%	(73,668)	(5.0)	%
Rod Mexico Open‑pit—La Caridad	285,363	314,661	324,403	(29,298)	(9.3)	%	(9,742)	(3.0)	%
SILVER (thousand ounces)
Mined
Peru Open‑pit
Toquepala	3,341	3,421	2,132	(80)	(2.4)	%	1,289	60.5	%
Cuajone	2,400	2,207	2,280	193	8.8	%	(73)	(3.2)	%
Mexico Open‑pit
La Caridad	2,266	1,947	2,085	319	16.4	%	(138)	(6.6)	%
Buenavista	5,550	5,755	5,162	(205)	(3.6)	%	593	11.5	%
IMMSA unit	7,983	6,943	5,649	1,040	15.0	%	1,294	22.9	%
Total Mined	21,540	20,273	17,308	1,267	6.2	%	2,965	17.1	%
Refined
Peru—Ilo	3,967	3,344	3,884	623	18.7	%	(540)	(13.9)	%
Mexico—La Caridad	8,128	8,049	8,496	79	1.0	%	(447)	(5.3)	%
IMMSA unit	1,793	1,195	1,203	598	50.0	%	(8)	(0.7)	%
Total Refined	13,888	12,588	13,583	1,300	10.3	%	(995)	(7.3)	%
MOLYBDENUM (thousand pounds)
Mined
Toquepala	22,088	16,043	9,169	6,045	37.7	%	6,874	75.0	%
Cuajone	9,315	7,242	6,832	2,073	28.6	%	410	6.0	%
Buenavista	12,058	13,487	10,842	(1,429)	(10.6)	%	2,645	24.4	%
La Caridad	23,226	22,500	21,626	726	3.2	%	874	4.0	%
Total Mined	66,687	59,272	48,469	7,415	12.5	%	10,803	22.3	%
ZINC (thousand pounds)
Mined IMMSA	151,964	162,970	156,038	(11,006)	(6.8)	%	6,932	4.4	%
Refined IMMSA	225,842	231,435	237,076	(5,593)	(2.4)	%	(5,641)	(2.4)	%

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SLOPE STABILITY:

Peruvian Operations

The Toquepala and Cuajone pits are each approximately 930 meters deep. Under the present mine plan configuration the Toquepala pit will reach a depth of 1,605 meters and the Cuajone pit will reach a depth of 1,380 meters. The increases in the depth of the pits present us with a number of geotechnical challenges. Perhaps the foremost concern is the possibility of slope failure, which all open-pit mines face. In the past, in order to maintain slope stability, we have decreased pit slope angles, installed additional or duplicate haul road access, and increased stripping requirements. We have also responded to hydrological conditions and removed material displaced by slope failures. To meet the geotechnical challenges relating to slope stability of the open-pit mines, we have taken the following steps:

In the late 1990s, we hosted round table meetings with a group of specialists to review pit designs for mines with depths greater than 700 meters. Based on the concepts defined at these meetings, we initiated slope stability studies to define the mining of reserves by optimum design. The studies were completed in 2000 and we believe we have implemented the study recommendations. One of the major changes implemented was slope angle reduction at both mines.

Since 1998, a wall depressurization program has been in place in both pits. This consists of a horizontal drilling program, which improves drainage thereby reducing saturation and increasing wall stability. Additionally, a new blasting control program was put in place and a new slope monitoring system was implemented.

Toquepala:

In 2007, we installed 20 meter wide geotechnical berms every 10 benches at the Toquepala mine. We believe this will further strengthen the stability of the Toquepala pit. In October 2012, two interferometric radars were put in place to monitor slope stability at the Toquepala mine, and in September 2013, new full monitoring software (FMS360) was installed. These systems improve the reliability of instrumentation, the information quality for assessing the behavior of the slopes and anticipates the risks of instability.

In 2013, a mining consulting group began a study of dump stability at the Toquepala mine. This study assessed the current stability of the dumps and is developing a geotechnical campaign to obtain information to assess the stability of the future and final stages of the dumps. In 2016, the stability study was resumed by executing geophysical test and test pits to characterize the dumps. The execution of sonic perforations and complementary geophysical tests are currently pending. On December 2016, the consultants also presented the report “Slope Stability Analysis in Deposits of Waste and Leachable Material”.

In 2016, the mining consultants presented the final report “Physical Stability of the Quebrada Honda tailings dam.” This study consisted in the development of geotechnical investigations, static, seismic and post-seismic stability analysis, filtration analysis, deformation analysis, liquefaction potential analysis and dynamic analysis.

In 2016, as part of the slope stability upgrade study, a geotechnical and hydrological oriented drill program of 3,470 meters was executed at the Toquepala mine. This program was conducted in order to complement the study and to gain a better understanding of the behavior of the rock mass. The geotechnical drilling program involved 11 diamond drill holes, six geotechnical drills and five hydrogeological drills, all of which entailed geological and geotechnical logging. During the execution of these hydrogeological drills, permeability tests in the rock were executed as well as slug tests and constant load tests. Additionally, instrumentation was implemented with five vibrating wire piezometers for the monitoring of water table and to give support to the hydrogeological model. In 2016, the external mining consultants began the report for phase three of this study, which was concluded in 2017. They submitted and updated the block models of inter-ramp angles, the model of rock mass, the hydrogeological model and the 3D structural model. In addition, fieldwork continued on the “Slope Stability Analysis in Deposits of Waste and Leachable Material” study by executing geophysical tests, sampling and laboratory tests of soil mechanics. This study was concluded and submitted by the external consultants in 2018.

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Additionally, in 2018 we dedicated efforts to update the geotechnical pit models, which are essential to perform the analysis of slope stability. Related to this, we have carried out actions, including the completion of the geotechnical database implementation, laboratory testing, training, and other important aspects. In 2019, external consultants performed the “2019 Update of Slope Stability Analysis in Deposits of Waste and Leachable Material” study. In addition, an IBIS ArcSAR radar was incorporated into the pit slope monitoring system; this radar equipment offers greater coverage, five kilometers of maximum range and reduced scanning time. Sub- horizontal drains were also implemented for pit slope depressurization.

In 2020, external consultants performed the “Stability Study of the Toquepala Pit in Current Conditions” and “Stability Study of the North, South, East, Northwest Waste Deposits and South Run of Mine (ROM) and Northwest Leach Deposits.” In addition, another IBIS ArcSAR radar, which has a maximum range of five kilometers and offers reduced scanning time, was incorporated into the pit slope monitoring system. We also implemented a database for geotechnical drillholes, implemented the project “Automation and Real Time Monitoring of geotechnical instrumentation in the Pit and Quebrada Honda Tailings Dam” and conditioned a location to install three radars to conduct geotechnical monitoring of the Quebrada Honda Tailings Dam.

In recent years, we have made significant efforts to conduct stability studies of the slopes of the pit, dumps and leachable deposits and tailings to safeguard personnel and equipment; ensure the continuity of operations; and comply with Peruvian regulations.

Cuajone:

At the Cuajone mine, in 2007 in order to minimize the damage to the slopes caused by production blast vibrations, blasting control using three pre-split drills was implemented. Also, the slope monitoring system with reflection prisms has been replaced by a system using slope monitoring radar. In February 2012, the first radar equipment was put in service and in August 2013, the second radar installation and a geotechnical surveillance camera was added. This system improved the reliability and continuity of monitoring, improved the quality of information used to evaluate the performance of the slopes and helped better anticipate the risk of instability. The sub-surface deformation and the water level are still monitored with inclinometers and piezometers. In September 2012, we completed a program of oriented geotechnical drilling totaling 17,938 meters, and in May 2013 we completed a program of vertical geotechnical drilling totaling 2,814 meters, with hydraulic tests performed on rock and subsequently instrumented with inclinometers/piezometers. The geotechnical and hydraulic information obtained from the two programs will be used in the development of a geotechnical study for the new 15-year mine development plan (2015-2029). Additionally, in 2013, we drilled 772 meters of sub-horizontal holes to drain the east slope of the pit. The geotechnical study for the new 15-year mine development plan was completed at the end of 2015, and the result of this study is the increase of the inter ramp angle by an average of three degrees and include 40 meters wide geotechnical berms for inter ramp heights above 150 meters. This study also contains recommendations for improving the stability of the pit slopes.

In 2013, the Board of Directors approved a project to improve slope stability in the southern area of the Cuajone mine, which will remove approximately 148 million tons of waste material to improve the mine design without reducing our actual production level. As of December 31, 2020, 146.4 million tons of waste material had been removed. For further information see Item 7 “Management Discussion and Analysis—Capital Investment Program.”

In 2017, we installed three vibration monitoring stations and ten digital extensometers to monitor surface deformations on waste dumps in real time. We also completed the detailed engineering for the construction of the coronation channel in the west Torata waste dump. In 2018, we began to operate the first radar to monitor blasting vibrations and set up a second geotechnical surveillance camera. This equipment will allow us to improve control over the walls of the pit and to anticipate possible damages.

In 2020, equipment to extract rock samples was implemented in the rock mechanics laboratory. This equipment allows us to obtain cylindrical rock specimens and perform rock mechanics tests under current technical standards and norms. A drone was also incorporated in the slope reconciliation activities to obtain detailed topographic information on the slopes and identify good practices or opportunities to build stable walls.

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To increase the possibility of mining in the event of a slide, we have provided for two extraction ramps for each open-pit mine. While these measures cannot guarantee that a slope failure will not occur, we believe that our mining practices are sound and that the steps taken and the ongoing reviews performed are a prudent methodology for open-pit mining.

Mexican operations

In 2004, our 15-year mine plan study for the La Caridad mine was awarded to an independent consulting firm to conduct a geotechnical evaluation. The purpose of the plan was to develop a program of optimum bench design and inter-ramp slope angles for the open-pit. The results of the evaluation presented by the consultants included a recommendation of a maximum average bench face angle of 72 degrees. Additionally, single benching was recommended for the upper sections of the west, south and east walls of the main pit. Double benching was recommended for the lower levels of the main pit and single benching for the upper slope segments that consist of either alluvial material, mine waste dumps or mineralized stockpile material. Alternatively, slopes in these types of materials, may be designed with an overall 37-degree slope. The geostructural and geotechnical parameters recommended were applied in the pit design for the new life of mine plan for La Caridad mine, which was prepared in 2015. This mine plan replaced the 15-year mine plan prepared in 2010. However, since final pit limits have yet to be established at La Caridad, all current pit walls are effectively working slopes. Geostructural and geotechnical data collected at the open-pit mine from cell-mapping and oriented-core drilling databases provided the basis for the geotechnical evaluation and recommendations.

In 2019, we assigned an independent consulting firm to conduct a geotechnical study of La Caridad, which included the Bella Union area, based on a 15-year mining plan. The results of this study included recommendations on geostructural and geotechnical parameters. These were applied to the pit design for the new mine plan for La Caridad, which replaced the 15-year mine plan prepared in 2015. We continue to collect new information related to geotechnical data and other geology features from the mine pit and diamond drill hole to ensure structural security and improve the geotechnical data base for future studies.

At the Buenavista mine, we are following the recommendations produced by a geotechnical evaluation of the design slope for the 15-year pit plan. This evaluation was prepared by an independent mine consulting firm. The assessment included the determination of optimum pit slope design angles and bench design parameters for the proposed mine plan. The objective of the study was: (1) to determine optimum inter-ramp slope angles and bench design parameters for the 15-year plan and (2) to identify and analyze any potential major instability that could adversely impact mine operation. In 2012, we installed a radar system to monitor the walls of the mine.

The following recommendations were made for the Buenavista mine: inter-ramp slope design angles for the 15-year pit plan for all of the 21 design sectors defined on a rock-fabric-based catch bench analysis, using double bench, can range from 48° and 55°, and the inter-ramp slope angles are based on geometries obtained from the back-break analysis using 80% reliability of achieving the required 7.5 meter catch bench width for a single bench configuration and 10.6 meter catch bench width for a double bench configuration. Preliminary observations suggest the 15-year pit walls may be relatively free-draining; the back-break analysis assumed depressurized conditions of mine benches, and the inter-ramp stability analysis were performed for both saturated and depressurized conditions.

A pit dewatering/depressurization plan for the Buenavista mine was also recommended to address the issues of open-pit drainage, dewatering plan and future slope depressurization. Phase I of the geohydrological study was completed by an independent consultant. The analysis included a preliminary assessment and work plan implementation.

In 2011, five wells for extraction and monitoring were drilled close to the mine. Also, we began a drilling program to monitor possible water filtration beyond the limits of the open-pit mine. All the information obtained from these well drilling programs has been analyzed and included in the hydrologic model. The open-pit dewatering program from the bottom benches also continued in 2012 with a drilling program of 3,797 meters, which was conducted at in several monitoring wells to ensure the ability to continue with the current mining plan.

In 2013, Buenavista continued the drilling program monitoring the extraction wells in the area of Increment (Phase) five of the mine and beyond the current limits of the open pit mine.

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In 2013, the program to dewater the Buenavista pit bottom continued, in accordance with the short and medium term mine plans. Pumping from sumps located in Increment five, permitted mining of high-grade copper blocks. Concurrent with this operational task, a geophysical study was conducted to determine the best locations for water extraction wells to control the inflow of water to the pit bottom and allow us to continue our mining operations. The water extracted is being used for various purposes, including road irrigation for dust mitigation. The geophysical investigation also permitted the location of underground workings and filtration and seepage through fractures.

A total of 7,339 meters was drilled in 2013 for 30 extraction wells, three of these wells are located in the area of Increment (Phase) five. The rest were drilled at various locations outside of the current open pit mine limit.

In 2014, we continued collecting new geotechnical information from two exploration drilling projects; this data is available to analyze the geotechnical data base for new studies in accordance with slope angle for the open pit excavations. In the free face benches at the open pit mine operations, the cell-mapping were prepared to increment the geotechnical database. Following the recommendations of the geotechnical evaluation, we continued monitoring the walls using the radar system.

Various studies are now being conducted by outside specialized consultants to establish long-range mine water management objectives and implement recommendations for the efficient use of this resource. We are also conducting a geotechnical study and a diamond drilling program with an independent consulting firm in order to obtain additional geotechnical information, which will allow us to verify the slope stability for the long-term mine plan. In addition, slope monitoring continues with the SSR 160 radar.

In July 2020, the OMNI 505 radar began operating. As such, we currently have two working radars, which allow us to cover 95% of the slopes in the operating areas of the mine. We also plan to add two total stations with prisms to this instrumentation. In addition, we expect to begin developing a geotechnical model for the mine, which includes reviewing the hydrological model of the deposit.

Tailings Dams

Tailings are comprised of solid particles originating at the concentrator plants during the grinding process that, combined with water, are sent to specially built structures where they are impounded. The water is recovered to be reused in the process.

Tailings dams are basically built in two manners: by using the coarse fraction from the same tailings or by using external material, often known as “borrowed material” such as rock, clay etc. We believe SCC’s tailings dams are built with the highest quality standards and engineering practices. We comply with and at times exceed the national norms and recommendations of the International Commission on Large Dams (ICOLD). In addition, we maintain a committee including both internal and external specialists, which periodically review the safety and operation of each dam. In 2020, we implemented the project “Automation and Real Time Monitoring of geotechnical instrumentation in the Pit and Quebrada Honda Tailings Dam” and conditioned a location to install three radars to conduct geotechnical monitoring of the Quebrada Honda Tailings Dam. We do not expect that these activities will generate any adverse material effects in our operations.

We have six tailings dams in operation in Mexico and one in Peru as follows:

Country	Operation	Name	Current Height	Material	Method
Mexico	Buenavista	Tailings dam # 3	100 meters	Borrowed	Downstream
Mexico	Buenavista	New tailings dam	92 meters	Borrowed	Downstream
Mexico	La Caridad	Tailings dam # 7	189 meters	Borrowed	Downstream
Mexico	Charcas	Tailings dam	55 meters	Coarse tailings	Upstream
Mexico	Santa Barbara	Noriega dam	45 meters	Coarse tailings	Upstream
Mexico	Santa Eulalia	Tailings dam	73 meters	Coarse tailings	Upstream
Peru	Cuajone and Toquepala	Quebrada Honda	133 meters	Coarse tailings	Downstream

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METAL PRODUCTION BY SEGMENTS

The descriptions below provide details on the operations and other information relating to the operations included in each of our three segments.

PERUVIAN OPERATIONS

Operations in our Peruvian segment include the Cuajone and Toquepala mine complexes and the smelting and refining plants, the industrial railroad that links Ilo, Toquepala and Cuajone and the port facilities.

The map below indicates the approximate location of, and access to, our Cuajone and Toquepala mine complexes and our Ilo processing facilities:

We conduct ongoing maintenance and improvement programs to ensure the satisfactory performance of our equipment. We believe all our Peruvian plant’s equipment is in good physical condition and suitable for our operations.

Cuajone

Our Cuajone operations consist of an open-pit copper mine and a concentrator located in southern Peru, 30 kilometers from the city of Moquegua and 840 kilometers from Lima, at an altitude of 3,430 meters above sea level. Access to the Cuajone property is by plane from Lima to Tacna (1:40 hours) and then by highway to Moquegua and Cuajone (3:30 hours). The concentrator has a milling capacity of 90,000 tons per day. Overburden removal commenced in 1970 and ore production commenced in 1976. Our Cuajone operations utilize a conventional open-pit mining method to collect copper ore for further processing at the concentrator.

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The table below shows production information for 2020, 2019 and 2018 for our Cuajone operations:

					Variance 2020 -
					2019
		2020	2019	2018	Volume	%
Mine annual operating days		366	365	365
Mine
Total ore mined	(kt)	30,183	29,017	29,571	1,166	4.0	%
Copper grade	(%)	0.666	0.644	0.651	0.022	3.4	%
Leach material mined	(kt)	2,084	1,513	1,122	571	37.7	%
Leach material grade	(%)	0.704	0.483	0.456	0.221	45.8	%
Stripping ratio	(x)	3.03	4.04	4.71	(1.01)	(25.0)	%
Total material mined	(kt)	130,047	153,911	175,177	(23,864)	(15.5)	%
Concentrator
Total material milled	(kt)	30,110	29,056	29,575	1,054	3.6	%
Copper recovery	(%)	84.23	83.65	83.40	0.58	0.7	%
Copper concentrate	(kt)	664.1	625.5	660.7	38.6	6.2	%
Copper in concentrate	(kt)	168.7	156.4	160.6	12.3	7.9	%
Copper concentrates average grade	(%)	25.40	25.00	24.31	0.40	1.6	%
Molybdenum
Molybdenum grade	(%)	0.022	0.019	0.019	0.003	15.8	%
Molybdenum recovery	(%)	64.28	59.23	55.63	5.05	8.5	%
Molybdenum concentrate	(kt)	7.8	6.1	5.8	1.7	27.9	%
Molybdenum concentrate average grade	(%)	54.29	54.03	53.30	0.26	0.5	%
Molybdenum in concentrate	(kt)	4.2	3.3	3.1	0.9	27.9	%

Key: kt = thousand tons

x = Stripping ratio obtained dividing waste by leachable material plus ore mined.

Copper and molybdenum grades are referred to as total copper grade and total molybdenum grade, respectively.

Geology

The Cuajone porphyry copper deposit is located on the western flank of Cordillera Occidental in the southern-most region of the Andes mountains range of Peru. The deposit is part of a mineral district that contains two additional known deposits, Toquepala and Quellaveco. The copper mineralization at Cuajone is typical of porphyry copper deposits.

The Cuajone deposit is located approximately 30 kilometers north-west from the Toquepala deposit and is part of the Toquepala Group, which dates back approximately 60 to 100 million years (Upper Cretaceous to Lower Tertiary). The Cuajone lithology contains volcanic rocks from the Cretaceous to the Quaternary period. The deposit contains 50 rock types including, pre-mineral rocks, basaltic andesite, porphyritic rhyolite, Toquepala dolerite, Toquepala rhyolite and intrusive rocks, including diorite, porphyritic latite, breccias and dikes. In addition, the following post-mineral rocks are present: the Huaylillas and Chuntacala formations, which have been formed by conglomerates, tuffs sequence, traquites and agglomerates. These formations date from nine to 23 million years. There is also the occurrence of Quaternary rocks, which were formed by alluvial and colluvial mainly located in slopes of hills and streams.

The mineralogy is simple and is evenly distributed. It is mainly composed of minerals such as chalcopyrite (CuFeS₂), chalcosine (Cu₂S) and molybdenite (MoS₂) with occasional presence of galena, enargite and tetraedrite, none of which have economic value.

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Mine exploration

Exploration activities during the drill campaign in 2020 were as follows:

Studies	Meters	Holes	Notes
Infill drilling	3,900	14	To obtain additional information to improve confidence in our block model.
Geotechnical	1,830	8	To confirm the continuity of major structures and the quality of rock mass.

Concentrator

Our Cuajone operations use state-of-the-art computer monitoring systems at the concentrator, the crushing plant and the flotation circuit to coordinate inflows and optimize operations. Material with a copper grade over 0.35% is loaded onto an overland conveyor belt and sent to the milling circuit, where giant rotating crushers reduce the size of the rocks to approximately one-half of an inch. The ore is then sent to the ball mills, which grind it to the consistency of fine powder. The finely ground powder is agitated in a water and reagents solution and is then transported to flotation cells. Air is pumped into the cells to produce foam for floating the copper and molybdenum minerals while waste materials called tailings are separated. This copper-molybdenum bulk concentrate is then treated by inverse flotation, where molybdenum is floated and copper is depressed. The copper concentrate is shipped by rail to the smelter at Ilo and the molybdenum concentrate is packaged for shipment to customers. Sulfides under 0.35% copper are considered waste.

Tailings are sent to thickeners to recover water. The remaining tailings are sent to the Quebrada Honda dam, our principal tailings storage facility.

A major mill expansion was completed in 1999 and the eleventh primary mill began operations in January 2008. In December 2013, the high-pressure grinding roll was put in operation. At the end of 2016, the Larox filter press for molybdenum concentrate began operations. The overland primary crusher began operations in May 2018. The new tailings thickener began operations in September 2019.

Toquepala

Our Toquepala operations consist of an open-pit copper mine and two concentrators. We also refine copper at the SX-EW facility through a leaching process. Toquepala is located in southern Peru, 30 kilometers from Cuajone and 870 kilometers from Lima at an altitude of 3,220 meters above sea level. Access is by plane from Lima to the city of Tacna (1:40 hours) and then by the Pan-American highway to Camiara (1:20 hours) and by road to Toquepala (1 hour). Each concentrator has a milling capacity of 60,000 tons per day. The SX-EW facility has a production capacity of 56,000 tons per year of LME grade A copper cathodes. Overburden removal commenced in 1957 and ore production commenced in 1960. Our Toquepala operations utilize a conventional open-pit mining method to collect copper ore for further processing in our concentrators. The second concentrator began operations in the fourth quarter of 2018.

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The table below contains production information for 2020, 2019 and 2018 for our Toquepala operations:

					Variance 2020 -
					2019
		2020	2019	2018	Volume	%
Mine annual operating days		366	365	365
Mine
Total ore mined	(kt)	39,383	38,248	22,701	1,135	3.0	%
Copper grade	(%)	0.634	0.682	0.686	(0.048)	(7.0)	%
Leach material mined	(kt)	52,838	96,700	104,126	(43,862)	(45.4)	%
Leach material grade	(%)	0.195	0.161	0.160	0.034	21.1	%
Stripping ratio	(x)	0.83	0.85	0.90	(0.02)	(2.4)	%
Total material mined	(kt)	168,715	249,083	241,514	(80,368)	(32.3)	%
Concentrator
Total material milled	(kt)	39,894	38,121	23,060	1,773	4.7	%
Copper recovery	(%)	90.44	89.64	90.99	0.80	0.9	%
Copper concentrate	(kt)	899.3	885.2	528.2	14.1	1.6	%
Copper in concentrate	(kt)	229.1	231.7	143.7	(2.6)	(1.1)	%
Copper concentrate average grade	(%)	25.48	26.20	27.21	(0.72)	(2.7)	%
SX‑EW plant
Estimated leach recovery	(%)	23.71	23.72	24.11	(0.01)	(0.0)	%
SX‑EW cathode production	(kt)	26.0	26.3	26.5	(0.3)	(1.1)	%
Molybdenum
Molybdenum grade	(%)	0.036	0.033	0.028	0.003	9.1	%
Molybdenum recovery	(%)	69.76	57.84	68.42	11.92	20.6	%
Molybdenum concentrate	(kt)	18.1	13.1	7.5	5.0	38.2	%
Molybdenum concentrate average grade	(%)	55.34	55.64	55.54	(0.30)	(0.5)	%
Molybdenum in concentrate	(kt)	10.0	7.3	4.2	2.7	37.4	%

Key: kt = thousand tons

x = Stripping ratio obtained dividing waste by leachable material plus ore mined.

Copper and molybdenum grades are referred to as total copper grade and total molybdenum grade, respectively.

Geology

The Toquepala porphyry deposit is located on the western slopes of Cordillera Occidental in the southern-most region of the Andes mountains range of Peru and approximately 120 kilometers from the border with Chile. This region extends into Chile and is home to many of the world’s most significant known copper deposits. The deposit is part of a mineral district that contains two additional known deposits, Cuajone and Quellaveco. The deposit is in a territory with intrusive and eruptive activities of rhyolitic and andesitic rocks, which are 70 million years old (Cretaceous-Tertiary) and have created volcanic lava. The lava is composed of rhyolites, andesites and volcanic agglomerates with a western dip and at an altitude of 1,500 meters. These series are known as the Toquepala Group. Subsequently, different intrusive activities occurred that broke and smelted the rocks of the Toquepala Group. These intrusive activities resulted in diorites, granodiorites and dikes of porphyritic dacite. Toquepala has a simple mineralogy with regular copper grade distribution. Economic ore is found as disseminated sulfurs throughout the deposit as veinlets that replenish empty places or as small aggregates. Ore minerals include chalcopyrite (CuFeS2), chalcosine (Cu2S) and molybdenite (MoS2). A secondary enrichment zone is also present with thicknesses between 0 and 150 meters.

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Mine Exploration

Exploration activities during the drill campaign in 2020 were as follows:

Studies	Meters	Holes	Notes
Ore and leach confirmation to reserves and phases	15,055	20	To confirm the continuity of ore and leach material.

Concentrators

Our Toquepala concentrators use state-of-the-art computer monitoring systems to coordinate inflows and optimize operations. Material with a copper grade over 0.25% is loaded onto an overland conveyor belt and sent to the crushing circuit, where rotating crushers reduce the size of the rocks by approximately 85% to less than one-half of an inch. The ore is then sent to the rod and ball mills, which grind it in a mix with water to the consistency of fine powder. The finely ground powder mixed with water is then transported to flotation cells. Air is pumped into the cells producing a froth, which carries the copper mineral to the surface but not the waste rock, or tailings. The bulk concentrate with sufficient molybdenum content is processed to recover molybdenum by inverse flotation. This final copper concentrate with a content of approximately 26.5% of copper is filtered to reduce moisture to 8.5% or less. Concentrates are then shipped by rail to the Ilo smelter.

Tailings are sent to thickeners where water is recovered. The remaining tailings are sent to the Quebrada Honda dam, our principal tailings storage facility.

SX-EW Plant

The SX-EW facility at Toquepala produces grade A LME electrowon copper cathodes of 99.999% purity from solutions obtained by leaching low-grade ore stored at the Toquepala and Cuajone mines. The leach plant commenced operations in 1995 with a design capacity of 35,629 tons per year of copper cathodes. In 1999, the capacity was expanded to 56,000 tons per year.

This facility processes copper oxides from Cuajone and copper sulfides from Toquepala. Copper oxides from Cuajone with a copper grade higher than 0.520%; acid solubility index higher than 51%; and a cyanide solubility index higher than 25% are leached. At Toquepala, the copper sulfides cutoff grade is 0.080% and therefore, material with a total copper grade between 0.080% and 0.294% is leached. Copper in solution produced at Cuajone is sent to Toquepala through an eight-inch pipe laid alongside the Cuajone-Toquepala railroad track.

Plant and equipment are supported by a maintenance plan and a quality management system to assure good physical condition and high availability. The SX-EW plant management quality system (including leaching operations) has been audited periodically since 2002 by an external audit company and found to be in compliance with the requirements of ISO 9001-2008, OHSAS 18001-2007 and ISO 14001-2015 standards.

Processing Facilities—Ilo

Our Ilo smelter and refinery complex is located in the southern part of Peru, 17 kilometers north of the city of Ilo, 121 kilometers from Toquepala, 147 kilometers from Cuajone and 871 kilometers from the city of Lima. Access is by plane from Lima to Tacna (1:40 hours) and then by highway to the city of Ilo (2:00 hours). Additionally, we maintain a port facility in Ilo, from where we ship our products and receive supplies. Products shipped and supplies received are moved between Toquepala, Cuajone and Ilo on our industrial railroad.

Smelter

Our Ilo smelter produces copper anodes for the refinery we operate as part of the same facility. When the copper produced by the smelter exceeds the refinery’s capacity, the excess is sold to other refineries around the world. In 2007, we completed a major modernization of the smelter. The nominal installed capacity of the smelter is 1,200,000 tons of

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copper concentrate per year. Copper concentrates from Toquepala and Cuajone are transported by railroad to the smelter, where they are smelted using an ISASMELT furnace, converters and anode furnaces to produce copper anodes with 99.7% copper. At the smelter, the concentrates are mixed with flux and other material and sent to the ISASMELT furnace producing a mixture of copper matte and slag, which is tapped through a taphole to either of two rotary holding furnaces, where these smelted phases will be separated. Copper matte contains approximately 63% copper. Copper matte is then sent to the four Pierce Smith converters, where the material is oxidized in two steps: (1) the iron sulfides in the matte are oxidized with oxygen enriched air and silica is added producing slag that is sent to the slag cleaning furnaces, and (2) the copper contained in the matte sulfides is then oxidized to produce blister copper, containing approximately 99.3% copper. The blister copper is refined in two anode furnaces by oxidation and sulfur is removed with compressed air injected into the bath. Finally, the oxygen content of the molten copper is adjusted by reduction by injecting liquefied petroleum gas with steam into the bath. Anodes, containing approximately 99.7% copper, are cast in two casting wheels. The smelter also can produce blister copper bars, especially when an anode furnace is undergoing general repairs.

The table below contains production information for 2020, 2019 and 2018 for our Ilo smelter plant:

					Variance 2020 -
					2019
Smelter		2020	2019	2018	Volume	%
Concentrate smelted	(kt)	1,210.6	1,075.5	1,187.7	135.1	12.6	%
Average copper recovery	(%)	97.4	97.4	97.4	—	—
Anode production	(kt)	346.7	318.2	345.6	28.5	9.0	%
Average anode grade	(%)	99.77	99.78	99.77	(0.01)	—	%
Blister production	kt	4.2	—	2.7	4.2	100.0	%
Average blister grade	(%)	99.29	—	99.24	99.29	100.00	%
Sulfuric acid produced	(kt)	1,203.9	1,072.6	1,169.1	131.3	12.2	%

Key: kt = thousand tons

The off gases from the smelter are treated to recover over 92% of the incoming sulfur received in the concentrates to produce 98.5% sulfuric acid. The gas stream from the smelter with 11.34% SO₂ is split between two plants: The No. 1 acid plant (single absorption/single contact) and the No. 2 plant (double absorption/double contact). Approximately, 16% of the acid produced is used at our facilities with the balance sold to third parties. We anticipate that our internal usage will be over 80% when the Tia Maria project begins operation. The smelter also has two oxygen plants. Plant No. 1, with 272 tons per day of production capacity, and Plant No.2, with 1,045 tons per day of capacity.

In 2010, the Ilo smelter marine trestle started operation. This facility allows us to offload directly to offshore ships the sulfuric acid produced, avoiding hauling cargo through the city of Ilo. The 500 meter long marine trestle is the last part of the Ilo smelter modernization project. Currently, all overseas shipments of sulfuric acid are shipped using the marine trestle.

Refinery

The Ilo refinery consists of an electrolytic plant, a precious metal plant and a number of ancillary installations. The refinery is producing grade A copper cathode of 99.998% purity. The nominal capacity is 294,763 tons per year. Anodic slimes are recovered from the refining process and then sent to the precious metals facility to produce refined silver, refined gold and commercial grade selenium.

Anodes are suspended in tanks containing a solution of sulfuric acid and copper sulfate. A low voltage but high amperage electrical current is passed through the anodes, chemical solution and cathodes to dissolve copper which is initially deposited on very thin starting sheets until thickness is increased to produce high grade copper cathodes. During this process, silver, gold and other metals, including palladium, platinum and selenium, along with other impurities, settle to the bottom of the tank in the form of anodic slime. This anodic slime is processed in a precious metal plant where silver, gold and selenium are recovered.

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The table below contains production information for 2020, 2019 and 2018 for our Ilo refinery and precious metals plants:

					Variance 2020 -
					2019
Refinery		2020	2019	2018	Volume	%
Cathodes produced	(kt)	286.3	256.7	292.7	29.6	11.5	%
Average copper grade	(%)	99.999	99.998	99.999	0.001	—	%
Refined silver produced	(000 Kg)	123.4	104.0	120.8	19.4	18.7	%
Refined gold produced	(kg)	227.5	258.1	282.4	(30.6)	(11.9)	%
Commercial grade selenium produced	(tons)	52.7	55.7	52.2	(3.0)	(5.4)	%

Key: kt = thousand tons

In addition to the processing facilities, the refinery has a production control section, a laboratory that provides sample analysis throughout the Company, a maintenance department, a desalinization plant and other support facilities.

Other facilities in Ilo include a coquina plant with a production capacity of 200,000 tons of seashells per year; this facility, however, has been declared in progressive closure. In addition, we had a lime plant with a capacity of 80,000 tons per year, which has suspended its operations. We also operate an industrial railroad to haul production and supplies between Toquepala, Cuajone and Ilo.

The industrial railroad’s main equipment includes locomotives of different types and rolling stock with different types of cars and capacities. The track runs in a single 214 kilometer standard gauge line and supports a 30-ton axle load. The total length of the track system is around 257 kilometers including main yards and sidings. The infrastructure includes 27 kilometers of track under tunnels and one concrete bridge. The industrial railroad includes a car repair shop which is responsible for maintaining and repairing the car fleet. Annual transported tonnage is approximately 5.9 million tons.

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MEXICAN OPERATIONS

The map below indicates the approximate locations of our Mexican mines and processing facilities:

MEXICAN OPEN-PIT SEGMENT

Our Mexican open-pit segment operations combine two units of Minera Mexico, La Caridad and Buenavista, which include La Caridad and Buenavista mine complexes and smelting and refining plants and support facilities, which service both complexes.

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The map below indicates the approximate location of, and access to, our Mexican open-pit mine complexes and our processing facilities:

We have ongoing maintenance and improvement programs to ensure the satisfactory performance of our equipment. We believe all our Mexican open-pit segment equipment is in good physical condition and suitable for our operations.

Buenavista

The Buenavista mining unit operates an open-pit copper mine, two concentrators and three SX-EW plants. It is located 100 air-kilometers northwest of La Caridad and 40 kilometers south of the Arizona, U.S. - Mexican border, at an altitude of 1,900 meters above sea level. It lies on the outskirts of the city of Cananea. Buenavista is connected by paved highways to the border city of Agua Prieta to the northeast, to the town of Nacozari in the southeast and to the town of

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Imuris to the west. Buenavista is also connected by railway to Agua Prieta and Nogales. A municipal airport is located approximately 20 kilometers to the northeast of Buenavista.

In 2016 we concluded our $3.5 billion investment program in Mexico. The program included a third SX-EW plant, which was completed in June 2014 with a rated annual capacity of 120,000 tons of copper and a new concentrator, completed in 2015, with an annual copper production capacity of 188,000 tons. The program also included two molybdenum plants with a combined annual capacity of 4,600 tons. The first plant was completed in 2013 and the second in 2016. Additionally, the program included the Crushing, Conveying and Spreading System for Leachable Ore (Quebalix IV), which was completed on time and under budget and is currently operating steadily. This project will reduce mining costs and increase SX-EW copper recovery, allowing the Buenavista unit to reach its copper production capacity of 500,000 tons.

The original concentrator currently has a nominal milling capacity of 82,000 tons per day. The second concentrator began operations in 2015 with a nominal milling capacity of 100,000 tons per day. The SX-EW facilities have a cathode production capacity of 174,470 tons per year. The Buenavista ore body is considered one of the world’s largest porphyry copper deposits. Buenavista is the oldest continuously operated copper mine in North America, with operations dating back to 1899. High grade ore deposits in the district were mined exclusively using underground methods. The Anaconda Company acquired the property in 1917. In the early 1940s, Anaconda started developing the first open-pit in Buenavista. In 1990, through a public auction procedure, Minera Mexico acquired 100% of the Buenavista mining assets for $475 million. Buenavista is currently applying conventional open-pit mining methods to extract copper ore for further processing in the concentrator.

The following table contains production information for 2020, 2019 and 2018 for Buenavista:

					2020 - 2019
					Variance
		2020	2019	2018	Volume	%
Mine annual operating days		366	365	365
Mine:
Total ore mined	(kt)	72,895	70,323	70,464	2,572	3.7	%
Copper grade	(%)	0.527	0.554	0.537	(0.027)	(4.9)	%
Leach material mined	(kt)	128,118	141,096	145,253	(12,978)	(9.2)	%
Leach material grade	(%)	0.211	0.216	0.242	(0.005)	(2.3)	%
Stripping ratio	(x)	0.29	0.37	0.38	(0.08)	(21.6)	%
Total material mined	(kt)	259,860	288,882	297,718	(29,022)	(10.0)	%
Concentrator:
Total material milled	(kt)	73,011	70,371	70,328	2,640	3.8	%
Copper recovery	(%)	86.72	86.66	86.02	0.06	0.1	%
Copper concentrate	(kt)	1,398.4	1,420.5	1,371.1	(22.1)	(1.6)	%
Copper in concentrate	(kt)	334.0	338.0	325.0	(4.0)	(1.2)	%
Copper concentrate average grade	(%)	23.88	23.80	23.70	0.1	0.3	%
SX‑EW plant
Estimated leach recovery	(%)	66.00	62.00	60.00	4.00	6.5	%
SX‑EW cathode production	(kt)	98.2	100.1	89.3	(1.9)	(1.9)	%
Molybdenum
Molybdenum grade	(%)	0.011	0.013	0.012	(0.002)	(15.4)	%
Molybdenum recovery	(%)	67.26	65.63	58.44	1.63	2.5	%
Molybdenum concentrate	(kt)	10.44	11.80	9.62	(1.36)	(11.5)	%
Molybdenum concentrate average grade	(%)	52.39	51.83	51.13	0.56	1.1	%
Molybdenum in concentrate	(kt)	5.47	6.12	4.92	(0.65)	(10.6)	%

Key: kt = thousand tons

x = Stripping ratio obtained dividing waste by leachable material plus ore mined.

The copper and molybdenum grade are total grade.

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Geology

The Buenavista mining district lies on the southern cordilleran orogen, which extends from southern Mexico to northwestern United States. It also falls within the Basin and Range metallogenic province. Geological and structural features in the district are representative of large, disseminated-type porphyry copper deposits. A calcareous sedimentary sequence of lower Paleozoic age, which is lithologically correlated with a similar section in southeastern Arizona, uncomformably overlies Precambrian granite basement. The entire section was covered by volcanic rocks from the Mesozoic age and later and is intruded by deep seated granodiorite batholith from the Tertiary age, with further quartz monzonite porphyry differentiates from the Laramide age.

Mineralization in the district is extensive, covering a surface area of approximately 30 square kilometers. An early pegmatitic stage associated with bornite-chalcopyrite-molybdenite assemblage was followed by widespread flooding of hydrothermal solutions with quartz-pyrite-chalcopyrite. A pervasive quartz-sericite alteration is evident throughout the district’s igneous rock fabric.

An extensive and economically important zone of supergene enrichment, with disseminated and stockworks of chalcocite (Cu₂S), developed below the iron oxide capping. This zone coincides with the topography and has an average thickness of 300 meters. A mixed zone of secondary and primary sulfides underlay the chalcocite blanket. The hypogene mineralization, principally chalcopyrite (CuFeS₂), extensively underlies the ore body. Molybdenite occurs throughout the deposit and the content tends to increase with depth.

The Buenavista copper porphyry is considered world-class and unique. The deepest exploration results in the core of the deposit have confirmed a significant increase in copper grades. Similar porphyry copper deposits usually contain lower grades at depth. The district is also unique due to the occurrence of high-grade breccia pipes, which occur in clusters following the trend of the district.

Current dimensions of the mineralized ore body are 5x3 kilometers, and projects to more than one kilometer at depth. Given the geological and economic potential of the Buenavista porphyry copper deposit, it is expected that the operation can support a sizeable increase in copper production capacity.

Mine Exploration

In-fill core drilling was conducted in 2011 at the Buenavista zinc-copper-silver deposit, including directional drilling for geotechnical purposes. A deep drilling campaign was initiated in 2011 to explore the extent of the deposit at depth, drilling a total of 3,860 meters in 2012. For short-term mine planning, 6,652 meters were drilled to confirm copper grade and metallurgical recoveries. Also in 2011, a condemnation drilling program was initiated to define areas for future infrastructure, and for leach and waste dump deposits. A total of 28,369 meters of core drilling were completed in 2011. Additionally, a geohydrology program was initiated in 2011 to explore the possibility of groundwater sources within the mine limits, and a total of 29,750 meters of diamond drilling were drilled in 2012. In addition, 3,797 meters were drilled for water monitoring wells. We did not conduct a drilling campaign in 2013. In 2014, we performed a drilling program of 20,000 meters in order to verify the reserves. In 2015, we complied with our drilling program target of 15,000 meters to define reserves and to confirm copper and molybdenum grades. In 2018, we drilled 4,434 meters to further define reserves and confirm grades. In 2019, in accordance with the long-term mine plan, 5,549 meters of diamond drilling were drilled to confirm the continuity of the deposit mineralization. In 2020, we drilled 32,218 meters in accordance with the mine plan.

Concentrator

Buenavista uses state-of-the-art computer monitoring systems at the concentrators, the crushing plant and the flotation circuit in order to coordinate inflows and optimize operations. In the original concentrator, material with a copper grade over 0.38% is loaded onto trucks and sent to the milling circuit, where giant rotating crushers reduce the size of the ore to approximately one-half of an inch. The ore is then sent to the ball mills, which grind it to the consistency of fine powder. The finely ground powder is agitated in a water and reagents solution and is then transported to flotation cells. Air is pumped into the cells producing a froth, which carries the copper mineral to the surface but not the waste rock, or

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tailings. Recovered copper, with the consistency of froth, is filtered and dried to produce copper concentrates with an average copper content of approximately 24%. Concentrates are then shipped by rail to the smelter at La Caridad.

In the second concentrator, material with a copper grade over 0.555% is sent to a three-phase milling circuit, where the ore size is reduced to approximately one-half inch. The ore is then sent to a circuit of six ball mills, which grind it to the consistency of fine powder. The finely ground powder is agitated in a water and reagents solution and is then transported to flotation cells. Air is pumped into the cells producing a froth, which carries the copper mineral to the surface but not the waste rock, or tailings. Recovered copper, with the consistency of froth, is filtered and dried to produce copper concentrates with an average copper content of approximately 24%. Concentrates are then sent by trucks or by railroad to the La Caridad smelter or to the Guaymas port, at Sonora, for export.

As part of the expansion program for this unit, in 2013 we completed the construction of the first molybdenum plant with an annual production capacity of 2,000 tons of molybdenum contained in concentrate. The plant was designed to process 1,500 tons of copper-molybdenum concentrates per day with a content recovery of approximately 80% copper and 50% molybdenum. The molybdenum plant consists of thickeners, homogenizer tanks, flotation cells, column cells and a holo-flite dryer. The second molybdenum plant was designed to process 3,040 tons of copper-molybdenum concentrates per day for a content recovery between 80% and 87% for copper and 60% for molybdenum. The plant generated its first production lot in July 2016 and fully initiated operations in November 2016.

SX-EW Plant

The Buenavista unit operates a leaching facility and three SX-EW plants. All copper ore with a grade lower than the mill cut-off grade of 0.38%, but higher than 0.25%, is delivered to the leach dumps. A cycle of leaching and resting occurs for approximately five years in the run-of-mine dumps and three years for the crushed leach material.

There are three irrigation systems for the dumps and eleven dams for the pregnant leach solution (PLS). Plant I has four solvent extraction tanks with a nominal capacity of 18,000 liters per minute of PLS and 54 electrowinning cells and has a daily production capacity of 30 tons of copper cathodes with 99.999% purity. Plant II has five trains of solvent extraction with a nominal capacity of 62,000 liters per minute of PLS and 220 cells distributed in two bays and has a daily production capacity of 120 tons of copper cathodes with 99.9% purity. Plant III has three trains of solvent extraction with a nominal capacity of 167,100 liters per minute of PLS and 270 cells distributed in two bays and has a daily production capacity of 328 tons of copper cathodes with 99.9% purity. The plant produces copper cathodes of LME grade A.

La Caridad

The La Caridad complex includes an open-pit mine, concentrator, smelter, copper refinery, precious metals refinery, rod plant, SX-EW plant, lime plant and two sulfuric acid plants.

La Caridad mine and mill are located about 23 kilometers southeast of the town of Nacozari in northeastern Sonora at an altitude of 2,000 meters above sea level. Nacozari is about 264 kilometers northeast of the Sonora state capital of Hermosillo and 121 kilometers south of the U.S.—Mexico border. Nacozari is connected by paved highway with Hermosillo and Agua Prieta and by rail with the international port of Guaymas, and the Mexican and United States rail systems. An airstrip with a reported runway length of 2,500 meters is located 36 kilometers north of Nacozari, less than one kilometer away from the La Caridad copper smelter and refinery. The smelter and the sulfuric acid plants, as well as the refineries and rod plant, are located approximately 24 kilometers from the mine. Access is by paved highway and by railroad.

The concentrator began operations in 1979; the molybdenum plant was added in 1982 and the smelter in 1986; the first sulfuric acid plant was added in 1988 and the SX-EW plant in 1995; the second sulfuric acid plant was added in 1997 and the copper refinery in 1997; the rod plant was added in 1998 and the precious metals refinery in 1999; and the dust and effluents plant was incorporated in 2012.

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The table below contains production information for 2020, 2019 and 2018 for La Caridad:

					Variance
					2020 - 2019
		2020	2019	2018	Volume	%
Mine annual operating days		366	365	365
Mine
Total ore mined	(kt)	34,949	34,401	34,675	548	1.6	%
Copper grade	(%)	0.361	0.356	0.353	0.005	1.4	%
Leach material mined	(kt)	29,561	28,457	30,764	1,104	3.9	%
Leach material grade	(%)	0.220	0.224	0.221	(0.004)	(1.8)	%
Stripping ratio	(x)	0.45	0.50	0.48	(0.05)	(10.0)	%
Total material mined	(kt)	93,373	94,578	96,541	(1,205)	(1.3)	%
Concentrator
Total material milled	(kt)	34,858	34,648	34,548	210	0.6
Copper recovery	(%)	87.14	86.80	87.09	0.34	0.4	%
Copper concentrate	(kt)	473.1	446.2	446.2	26.9	6.0	%
Copper in concentrate	(kt)	109.7	107.2	106.1	2.5	2.3	%
Copper concentrate average grade	(%)	23.18	24.01	23.78	(0.83)	(3.5)	%
SX‑EW plant
Estimated leach recovery	(%)	38.04	38.06	37.99	(0.02)	(0.1)	%
SX‑EW cathode production	(kt)	25.85	25.93	26.41	(0.08)	(0.3)	%
Molybdenum
Molybdenum grade	(%)	0.036	0.036	0.034	—	—	%
Molybdenum recovery	(%)	82.82	82.17	83.28	0.65	0.8	%
Molybdenum concentrate	(kt)	19.3	18.8	18.0	0.5	2.7	%
Molybdenum concentrate average grade	(%)	54.48	54.26	54.61	0.2	0.4	%
Molybdenum in concentrate	(kt)	10.5	10.2	9.8	0.3	2.9	%

Key: kt = thousand tons

x = Stripping ratio obtained dividing waste by leachable material plus ore mined

The copper and molybdenum grade are total grade.

Geology

The La Caridad deposit is a typical porphyry copper and molybdenum deposit, similar to that found in the southwestern basin of United States. The La Caridad mine uses a conventional open-pit mining method. The ore body is at the top of a mountain, which gives La Caridad the advantage of a relatively low waste-stripping ratio, natural pit drainage and relatively short haul for both ore and waste. The mining method involves drilling, blasting, loading and hauling of ore mill to the primary crushers and leach materials and waste to dumps.

La Caridad deposit is located in northeastern Sonora, Mexico. The deposit is situated near the crest of the Sierra Juriquipa, about 23 kilometers southeast of the town of Nacozari, Sonora, Mexico. The Sierra Juriquipa rises to elevations of around 2,000 meters in the vicinity of La Caridad and is one of the many north-trending mountain ranges in Sonora that form a southern extension of the basin and range province.

The La Caridad porphyry copper-molybdenum deposit occurs exclusively in felsic to intermediate intrusive igneous rocks and associated breccias. Host rocks include diorite and granodiorite. These rocks are intruded by a quartz monzonite porphyry stock and by numerous breccia masses, which contain fragments of all the older rock types.

Supergene enrichment consists of complete to partial chalcosite (Cu₂S) replacement of chalcopyrite (CuFeS₂). The zone of supergene enrichment occurs as a flat and tabular blanket with an average diameter of 1,700 meters and thickness generally between 0 and 90 meters.

Economic ore is found as disseminated sulfurs within the central part of the deposit. Sulfide-filled breccia cavities are most abundant in the intrusive breccia. This breccia-cavity mineralization occurs as sulfide aggregates that have

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crystallized in the spaces separating breccia clasts. Near the margins of the deposit, mineralization occurs almost exclusively in veinlets. Ore minerals include chalcopyrite (CuFeS2), chalcosite (Cu₂S) and molybdenite (MoS₂).

Mine Exploration

The La Caridad ore body has been mined for over 35 years. The extent of the model area is approximately 6,000 meters by 4,000 meters with elevations ranging from 750 to 1,800 meters. Seventeen drilling campaigns have been conducted on the property since 1968. These campaigns drilled a total of 3,349 drill holes: 1,186 were diamond drill holes and 2,163 were reverse circulation. We have also drilled some hammer and percussion drill holes.

In 2008, La Caridad finished a large exploration program of 50,000 meters. The target was to reach the 900 level to reduce the drilling space; define the copper and molybdenum mineralization continuity; and carry out metallurgical testing for the flotation and leaching processes. There was no exploration program in 2009, 2011 and 2013. In 2012, we drilled 10,000 meters and further defined the extent of copper and molybdenum mineralization. From 2014 to 2017 we drilled 96 diamond drill holes equivalent to 38,984 meters to define a high-grade ore body located on the south western edge of the pit (Bella Union location). In 2018, we drilled 18 diamond drill holes equivalent to 5,132 meters at the Bella Union location. In 2019, we drilled 15 diamond drill holes at the La Caridad pit and 6 diamond drill holes at the Bella Union location, for a total of 3,790 meters. In 2020, we drilled 44 diamond drill holes at the La Caridad pit for a total of 9,453 meters.

Concentrator

La Caridad uses state-of-the-art computer monitoring systems at the concentrator, the crushing plant and the flotation circuit to coordinate inflows and optimize operations. The concentrator has a current capacity of 94,500 tons of ore per day.

Ore extracted from the mine with a copper grade over 0.30% is sent to the concentrator and processed into copper concentrates and molybdenum concentrates. The copper concentrates are sent to the smelter and the molybdenum concentrate is sold to a Mexican customer. The molybdenum recovery plant has a capacity of 2,000 tons per day of copper-molybdenum concentrates. The lime plant has a capacity of 340 tons of finished product per day.

SX-EW Plant

Approximately 919.7 million tons of leaching ore with an average grade of approximately 0.241% copper was extracted from the La Caridad open-pit mine and deposited in leaching dumps through December 31, 2020. All copper ore with a grade lower than the mill cut-off grade 0.30%, but higher than 0.15% copper, is delivered to the leaching dumps. In 1995, we completed the construction of a SX-EW facility at La Caridad that has allowed us to process this ore and certain leach ore reserves that were not mined; this has led to a subsequent reduction in our copper production costs. The SX-EW facility has an annual design capacity of 21,900 tons of copper cathodes.

The plant has three trains of solvent extraction with a nominal capacity of 2,400 cubic meters per hour and has 94 electrowinning cells, which are distributed in a single electrolytic bay. The plant has a daily production capacity of 65 tons of copper cathodes with 99.999% purity.

Processing Facilities—La Caridad

Our La Caridad complex includes a smelter, an electrolytic copper refinery, a precious metal refinery, a copper rod plant and an effluent and dust treatment plant. The distance between this complex and the La Caridad mine is approximately 24 kilometers.

Smelter

Copper concentrates from Buenavista, Santa Barbara, Charcas and La Caridad are transported by rail and truck to the La Caridad smelter where they are processed and cast into copper anodes of 99.2% purity. Sulfur dioxide off-gases

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collected from the flash furnace, the El Teniente converter and conventional converters are processed into sulfuric acid at two sulfuric acid plants. Approximately 2% to 3% of this acid is used by our SX-EW plants and the balance is sold to third parties.

All of the anodes produced in the smelter are sent to the La Caridad copper refinery. The actual installed capacity of the smelter is 1,000,000 tons per year, a capacity that is sufficient to treat all the concentrates of La Caridad and almost 40.5% of total production of the OMIMSA I and OMIMSA II concentrators from Buenavista. In 2010, the smelter also began processing concentrates from the IMMSA mines, as we closed the San Luis Potosi smelter.

Other facilities in the smelter include two sulfuric acid plants with capacities of 2,625 and 2,135 tons per day, three oxygen plants each with a production capacity of 275 tons per day; and one power turbine which generates 11.5 MWh.

Refinery

La Caridad includes an electrolytic copper refinery that uses permanent cathode technology. The installed capacity of the refinery is 300,000 tons per year. The refinery consists of an anode plant with a preparation area, an electrolytic plant with an electrolytic cell house with 1,115 cells and 32 liberator cells, two cathode stripping machines, an anode washing machine, a slime treatment plant and a number of ancillary installations. The refinery is producing grade A (LME) and grade 1 (COMEX) copper cathode of 99.99% purity. Anodic slimes are recovered from the refining process and sent to the slime treatment plant, where additional copper is extracted. The slimes are then filtered, dried, packed and shipped to the La Caridad precious metals refinery to produce silver and gold.

Precious Metals Plant

The operations at the precious metal refinery begin with the reception of anodic slimes, which are dried in a steam dryer. After this, the dried slime is smelted and a gold and silver alloy is obtained, which is known as Dore. The precious metal refinery plant has a hydrometallurgical stage and a pyrometallurgical stage, in addition to a steam dryer, Dore casting system, Kaldo furnace, 20 electrolytic cells in the silver refinery, one induction furnace for fine silver, one silver ingot casting system and two reactors for obtaining fine gold. The process ends with the refining of the gold and silver alloy. We also recover commercial selenium from the gas produced by the Kaldo furnace process.

Copper Rod Plant

A rod plant at the La Caridad complex began operations in 1998 and reached its full annual operating capacity of 150,000 tons in 1999. The plant is producing eight-millimeter copper rods with a purity of 99.99%.

Effluent and Dust Treatment Plant

In 2012, we started operating a dust and effluent plant with a treatment capacity of 5,000 tons of smelter dusts per year, which will produce 1,500 tons of copper by-products and 2,500 tons of lead sulfates per year. This plant is designed to reduce dust emissions from La Caridad metallurgical complex.

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The table below contains production information for 2020, 2019 and 2018 for the La Caridad processing facilities:

					Variance
					2020 - 2019
		2020	2019	2018	Volume	%
Smelter
Total copper concentrate smelted	(kt)	1,029.5	1,011.4	1,041.7	18.1	1.8	%
Anode copper production	(kt)	285.3	279.1	287.7	6.2	2.2	%
Average copper content in anode	(%)	99.45	99.47	99.49	(0.02)	(0.0)	%
Average smelter recovery	(%)	96.3	97.1	96.9	(0.8)	(0.8)	%
Sulfuric acid production	(kt)	967.5	966.2	1,002.5	1.3	0.1	%
Refinery
Refined cathode production	(kt)	240.4	231.6	239.2	8.8	3.8	%
Refined silver production	(000 kg)	252.8	250.3	264.3	2.5	1.0	%
Refined gold production	(Kg)	1,028.1	1,125.8	1,228.5	(97.7)	(8.7)	%
Rod Plant
Copper rod production	(kt)	129.4	142.7	147.1	(13.3)	(9.3)	%

Key: kt = thousand tons

Kg = kilograms

MEXICAN IMMSA UNIT

Our IMMSA unit (underground mining poly-metallic division) operates five underground mining complexes situated in central and northern Mexico. It produces zinc, lead, copper, silver and gold. These complexes include industrial processing facilities for zinc, lead, copper and silver. All of IMMSA’s mining facilities employ exploitation systems and conventional equipment. We believe that all the plants and equipment are in satisfactory operating condition. IMMSA’s principal mining facilities are Charcas, Santa Barbara, San Martin, Santa Eulalia and Taxco.

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The table below contains production information for 2020, 2019 and 2018 for our Mexican IMMSA unit:

					Variance
					2020 - 2019
		2020	2019	2018	Volume	%
Average annual operating days(*)		341	352	353
Total material mined and milled	(kt)	4,242	3,911	3,277	331	8.5	%
Zinc:
Average ore grade	(%)	2.03	2.24	2.51	(0.21)	(9.4)	%
Average recovery	(%)	80.01	84.46	86.07	(4.45)	(5.3)	%
Concentrate produced	(kt)	133.6	146.7	135.3	(13.1)	(8.9)	%
Concentrate average grade	(%)	51.61	50.40	52.30	1.21	2.4	%
Zinc in concentrate	(kt)	68.9	73.9	70.8	(5.0)	(6.8)	%
Lead:
Average ore grade	(%)	0.72	0.78	0.91	(0.06)	(7.7)	%
Average recovery	(%)	66.93	74.01	74.32	(7.08)	(9.6)	%
Concentrate produced	(kt)	38.5	43.8	39.1	(5.3)	(12.1)	%
Concentrate average grade	(%)	52.86	51.47	56.51	1.39	2.7	%
Lead in concentrate	(kt)	20.4	22.6	22.1	(2.2)	(9.7)	%
Copper:
Average ore grade	(%)	0.44	0.38	0.35	0.06	15.8
Average recovery	(%)	55.02	55.50	54.56	(0.48)	(0.9)	%
Concentrate produced	(kt)	45.7	33.9	23.5	11.8	34.8	%
Concentrate average grade	(%)	22.52	24.40	26.45	(1.88)	(7.7)	%
Copper in concentrate	(kt)	10.3	8.3	6.2	2.0	24.1	%
Silver:
Average ore grade	(ounces)	2.58	2.26	2.25	0.32	14.2	%
Average recovery	(%)	73.08	78.53	76.59	(5.45)	(6.9)	%
Concentrate average grade	(%)	36.6	30.9	28.5	5.7	18.4	%
Silver in concentrates	((000) ounces)	7,982.8	6,942.5	5,649.5	1,040.3	15.0	%

kt = thousand tons

(*) Weighted average annual operating days based on total material mined and milled in the four active mines: Charcas, Santa Barbara, Santa Eulalia and San Martin.

Charcas

The Charcas mining complex is located 111 kilometers north of the city of San Luis Potosi in the State of San Luis Potosi, Mexico. Charcas is connected to the state capital by a paved highway of 130 kilometers. It was discovered in 1573 and operations in the 20th century began in 1911. The complex includes three underground mines (San Bartolo, Rey-Reina and La Aurora) and one flotation plant that produces zinc, lead and copper concentrates with significant amounts of silver. The Charcas mine is characterized by low operating costs and good quality ores and is situated near the zinc refinery. Regarding its geology, economic ore is found as replacement sulfurs in carbonates host rock. The ore mineralogy is comprised predominantly of calcopyrite (CuFeS₂), sphalerite (ZnS), galena (PbS) and silver minerals as diaphorite (Pb₂Ag₃Sb₃S₈). The Charcas mine is now Mexico’s largest producer of zinc.

In October 2015, an earthquake damaged some underground facilities as well as the access to the mine. Consequently, normal mine operations were interrupted. In 2016, operations took place normally and a production compliance level of 97% was reached.

Mine exploration in 2015 included 32,144 meters of surface drilling and 20,536 meters from underground stations, which increased our reserves by 3,089,797 tons. For 2016, it included 20,000 meters of surface drilling and 20,754 meters from underground stations, which increased our reserves by 1,778,728 tons. For 2017, it included 5,999 meters of surface drilling and 23,098 meters from underground stations, which increased our reserves by 2,004,577 tons. For 2018, 11,757 meters of diamond drilling and 20,285 meters from underground stations were drilled, which increased our reserves by 2,282,322 tons. For 2019, 20,105 meters of diamond drilling and 9,012 meters from

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underground stations were drilled, which increased our reserves by 2,502,204 tons. In 2020, we drilled 10,609 meters from underground stations, which increased our reserves by 2,356,499 tons. For 2021, 15,364 meters of diamond drilling are planned to identify additional reserves.

Santa Barbara

The Santa Barbara mining complex is located approximately 26 kilometers southwest of the city of Hidalgo del Parral in southern Chihuahua, Mexico. The area can be reached via paved road from Hidalgo del Parral, a city on a federal highway. It was discovered in 1536 and mining activities in the 20th century began in 1913. Santa Barbara includes three main underground mines (San Diego, Segovedad and Tecolotes) as well as a flotation plant and produces lead, copper and zinc concentrates, with significant amounts of silver.

Regarding its geology, economic ore minerals include sphalerite (ZnS), marmatite (ZnFeS), galena (PbS), chalcopyrite (CuFeS₂) and tetrahedrite (CuFe₁₂Sb₄S₁₃). Due to the variable characteristics of the ore bodies, four types of mining methods are used: shrinkage stoping, long-hole drilled open stoping, cut-and-fill stoping and horizontal bench stoping. The ore, once crushed, is processed in the flotation plant to produce concentrates.

Mine exploration in 2015 included 5,977 meters of surface drilling and 16,609 meters from underground stations, which increased our reserves by 1,135,750 tons. For 2016, it included 14,300 meters from underground stations, which increased our reserves by 1,416,756 tons. For 2017, it included 2,571 meters of surface drilling and 11,838 meters from underground stations, which increased our reserves by 613,872 tons. For 2018, 10,769 meters from underground stations were drilled, which increased our reserves by 418,345 tons. For 2019, we achieved 11,070 meters of surface drilling and 208 meters from the underground stations, which increased our reserves by 2,160,062 tons. In 2020, we drilled 19,873 meters from underground stations, which increased our reserves by 2,606,888 tons. For 2021, 37,110 meters of diamond drilling are planned to identify additional reserves.

Santa Eulalia

The mining district of Santa Eulalia is located in the central part of the state of Chihuahua, Mexico, approximately 26 kilometers east of the city of Chihuahua, and is connected to the city of Chihuahua by a paved road (highway no. 45). It was discovered in 1590 but exploitation began in 1870. The main mines in Santa Eulalia are The Buena Tierra mine and the San Antonio mine.

Regarding its geology, the majority of mineralization corresponds to ore skarns: silicoaluminates of calcium, iron and manganese with variable quantities of lead, zinc, copper and iron sulfides. Economic ore include sphalerite (ZnS), galena (PbS) and small quantities of pyrargyrite (Ag₃SbS₃).

Mine exploration in 2015 included 3,014 meters from underground stations, which increased our reserves by 64,800 tons. In 2017, exploration included 936 meters from underground stations, which increased our reserves by 60,525 tons. In 2018, 1,930 meters from underground stations were drilled, which increased our reserves by 249,930 tons. In 2019, we achieved 2,207 meters of surface drilling and 10,214 meters from the underground stations, which increased our reserves by 409,733 tons.

In the first quarter of 2020, the Santa Eulalia mine temporarily suspended its operations due to flooding. We are currently evaluating different options to supply the Santa Eulalia concentrator. We are also evaluating drainage at the mining facilities and determining if it is possible to sell the water for agricultural or other uses.

San Martin

The San Martin mining complex is located in the municipality of Sombrerete in the western part of the state of Zacatecas, Mexico. It was discovered in 1555 and mining operations in the 20th century began in 1949. The complex includes an underground mine and a flotation plant. The ore body contains lead, copper and zinc concentrates, with significant amounts of silver.

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After eleven years of an illegal stoppage, we resumed control of the San Martin mine in August 2018. The San Martin facilities deteriorated during this period and we undertook a major renovation to restart operations in the second quarter of 2019, with a capital budget of $97.7 million. Production at this mine was restored to full capacity at the end of the third quarter of 2019.

Mine exploration in 2019 included 1,304 meters of surface drilling and 4,315 meters from underground stations, which increased our reserves by 374,683 tons. In 2020, we drilled 5,414 meters from underground stations, which increased our reserves by 519,761 tons. For 2021, 10,851 meters of diamond drilling are planned to identify additional reserves.

Taxco

The Taxco mining complex has been on strike since July 2007. It is located on the outskirts of the city of Taxco in the northern part of the state of Guerrero, Mexico. It was discovered in 1519 and mining activities in the 20th century began in 1918. The complex includes several underground mines (San Antonio, Guerrero and Remedios) and a flotation plant. The ore contains lead and zinc concentrates, with some amounts of gold and silver.

There was no mine exploration drilling at Taxco during the three-year period ended December 31, 2020 due to the strikes. Please see Note 13 “Commitments and Contingencies—Labor matters” to the consolidated financial statements.

Processing Facilities—San Luis Potosi

Our San Luis Potosi electrolytic zinc refinery is located in the city of San Luis Potosi, in the state of San Luis Potosi, Mexico. The city of San Luis Potosi is connected to our refinery by a major highway.

Zinc Refinery

The San Luis Potosi electrolytic zinc refinery was built in 1982 and was designed to produce 105,000 tons of refined zinc per year by treating up to 200,000 tons of zinc concentrate from our own mines, principally Charcas, which is located 113 kilometers from the refinery. The refinery produces special high-grade zinc (99.995%), high-grade zinc (over 99.9%) and zinc-based alloys with aluminum, lead, copper or magnesium in varying quantities and sizes depending on market demand. Refined silver and gold production is obtained from tolling services provided by a third party mining company.

The electrolytic zinc refinery has an acid plant, a steam recovery boiler and a roaster. There is also a calcine processing area with five leaching stages: neutral, hot acid, intermediate acid, acid, purified fourth and jarosite, as well as two stages for solution purifying.

The table below contains production information for 2020, 2019 and 2018 for our San Luis Potosi zinc refinery:

					Variance
					2020 - 2019
		2020	2019	2018	Volume	%
Total zinc concentrate treated	(kt)	211.6	209.3	204.0	2.3	1.1	%
Refined zinc produced	(kt)	102.4	104.9	107.5	(2.5)	(2.4)	%
Sulfuric acid produced	(kt)	181.0	187.2	184.2	(6.2)	(3.3)	%
Refined silver produced	(kt)	16.3	16.1	16.8	0.2	1.2	%
Refined gold produced	(k)	21.0	19.2	23.8	1.8	9.4	%
Refined cadmium produced	(kt)	0.6	0.6	0.6	—	—	%
Average refinery recovery	(%)	93.4	93.4	94.4	—	—	%

kt = thousand tons

Nueva Rosita Coal and Coke Complex

The Nueva Rosita coal and coke complex began operations in 1924 and is located in the state of Coahuila, Mexico, on the outskirts of the city of Nueva Rosita near the Texas border. It includes (a) an underground coal mine, which has been

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closed since 2006; (b) an open-pit mine with a yearly capacity of approximately 350,000 tons of coal; (c) a coal washing plant with a capacity of 900,000 tons per year that produces high quality clean coal; and d) a re-engineered and modernized 21 ovens coke facility capable of producing 100,000 tons of coke per year (metallurgical, nut and fine) of which, 95,000 tons are metallurgical coke. The complex also has a by-product plant to clean the coke gas oven in which tar, ammonium sulfate and light crude oil are recovered and two boilers, which produce 80,000 pounds of steam that is used in the by-products plant. In September 2017, a decision was made by the Company to close the coke plant and to initiate the cleaning and remediation process with a current budget of $14.0 million. As of December 31, 2020, expenses totaled $6.4 million.

On February 19, 2020, the Company announced the decision to return the underground coal mine, (the Olivo concession), which had been closed since 2006, to the Mexican government in response to a request of the President of Mexico to resume efforts to locate the remains of miners lost in a 2006 mining accident. On February 20, 2020 the Company presented the offer to return the concession to the General Direction of Mines. On September 3, 2020, the authorities accepted the offer.

Carbon mine exploration

Although, an intensive diamond drilling exploration program has identified two additional areas, Esperanza with a potential for more than 30 million tons of “in place” mineralized coal and Guayacan with a potential for 15 million tons of “in place” mineralized coal, all of which could be used for a future coal-fired power plant; in July 2019, the Company decided to suspend coal mining operations.

The table below contains production information for 2020, 2019 and 2018 for our Nueva Rosita coal and coke complex:

					Variance 2020 - 2019
		2020	2019	2018	Volume	%
Coal mined—open‑pit	(kt)	—	52.7	108.6	(52.7)	(100.0)	%
Average BTU content	BTU/Lb	—	10,022	10,022	(10,022.0)	(100.0)
Average percent sulfur	%	—	1.38	1.38	(1.4)	(100.0)
Clean coal produced	(kt)	—	25.2	42.8	(25.2)	(100.0)	%
Coke tonnage produced	(kt)	—	—	—	—	—
Average realized price—Coal	($ per ton)	—	48.4	39.0	(48.4)	(100.0)	%
Average realized price—Coke	($ per ton)	—	—	265.0	—	(100.0)	%

kt = thousand tons

ORE RESERVES

Ore reserves are the estimated quantities of proven and probable material that may be economically mined and processed for extraction of their mineral content at the time of reserve determination. “Proven” (measured) reserves are reserves for which (a) quantity is computed from dimensions revealed in outcrops, trenches, workings or drill holes; (b) grade and/or quality are computed from the results of detailed samplings; and (c) the sites for inspection, sampling and measurement are spaced so closely and the geologic character is so well defined that size, shape, depth and mineral content of reserves are well-established. “Probable” (indicated) reserves are reserves for which quantity and grade and/or quality are computed from information similar to that used for proven (measured) reserves, but the sites for inspection, sampling, and measurement are farther apart or are otherwise less adequately spaced. The degree of assurance, although lower than that for proven (measured) reserves, is high enough to assume continuity between points of observation. “Mineralized material,” on the other hand, is a mineralized body that has been delineated by appropriately spaced drilling and/or underground sampling to support the reported tonnage and average grade of metal(s). Such a deposit does not qualify as a reserve until legal and economic feasibility are concluded based upon a comprehensive evaluation of unit costs, grade, recoveries and other material factors.

Our proven and probable ore reserve estimates are based on engineering evaluations of assay values derived from the sampling of drill holes and other openings. We believe that the samplings taken are spaced at intervals close enough and

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the geological characteristics of the deposits are sufficiently well defined to render the estimates reliable. The ore reserve estimates include assessments of the resource, mining and metallurgy, as well as economic, marketing, legal, environmental, governmental, social and other necessary considerations.

Our Peruvian operations, including the Toquepala and Cuajone reserves, are classified into proven (measured), probable (indicated) and possible (inferred) categories based on a Relative Confidence Bound Index (“RCB Index”) that measures our level of geologic knowledge and confidence in each block. The RCB index is a measure of relative confidence in the block grade estimate. This approach combines the local variability of the composites used to krig a block with the kriging variance and incorporates the use of confidence intervals in measuring uncertainty of the block estimates relative to each other. The final resource classification is then based on the distribution of these RCB values for blocks above 0.05% copper. It is the distribution that is used to find the breaks between proven/probable and probable/possible.

Our Mexican operations, including the Buenavista and La Caridad reserves, are calculated using a mathematical block model and applying the MineSight software system. The estimated grades per block are classified as proven and probable. These grades are calculated applying a three-dimensional interpolation procedure and the inverse distance squared. Likewise, the quadrant method or spherical search is implemented to limit the number of composites that will affect the block’s interpolated value. The composites data is derived from the geological exploration of the ore body. In order to classify the individual blocks in the model, a thorough geostatistical variogram analysis is conducted, taking into consideration the principal characteristics of the deposit. Based on this block model classification, and with the implementation of the Lerch-Grossman algorithm, and the MineSight Pit Optimizer procedure, mineable reserves are determined. The calculated proven and probable reserves include those blocks that are economically feasible to mine by open-pit method within a particular mine design.

For the IMMSA unit, the basis for reserve estimations are sampling of mining operations and drilling exploration, geographical and topographic surveys, tracking down all the foregoing in the corresponding maps, measurement, calculation and interpretation based on the maps and reports from the mines, the mills and/or smelters. Mineral reserves are mineral stock which is estimated for extraction, to exploit if necessary, to sell or utilize economically, all or in part, taking into consideration the quotations, subsidies, costs, availability of treatment plants and other conditions that we estimate will prevail in the period for which reserves are being calculated. The reserves are divided into proven (85% reliable or more according to statistical studies) and probable (70% - 80% reliable or more according to statistical studies) categories according to their level of reliability and availability. In order to comply with SEC regulations, proven reserves is a classification that can only be used for such mineral found on top of the last level of the mine (either mineral up to 15 meters below the last level or below the first 15 meters only with sufficient drilling (25 or 30 meters between each drill)).

Our engineering department reviews reserve computations in detail on an annual basis. In addition, our engineering department reviews the computation when changes in assumptions occur. Changes can occur for price or cost assumptions, results in field drilling or new geotechnical parameters. We also engage third party consultants to review mine planning procedures.

Pursuant to SEC guidance, the reserves information in this report are calculated using average metals prices over the most recent three years unless otherwise stated. We refer to these three-year average metals prices as “current prices.” Our current prices for copper are calculated using prices quoted by COMEX, and our current prices for molybdenum are calculated according to Platt’s Metals Week. Unless otherwise stated, the reserve estimates in this report use $2.82 per pound for copper and $10.66 per pound for molybdenum, both current prices as of December 31, 2020. The current prices for copper and molybdenum were $2.82 and $10.50 as of December 31, 2019 and $2.64 and $8.88 as of December 31, 2018, respectively.

For internal ore reserve estimation, our management uses long-term metal price assumptions for copper and molybdenum, which are intended to approximate average prices over the long term. As of December 31, 2020, we considered $3.00 per pound of copper and $9.00 per pound of molybdenum. As of December 31, 2019, we considered $2.90 per pound of copper and $7.50 per pound of molybdenum.

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The average metal prices over the last 10 and 15-year periods and the continued positive outlook for these metals have led us to use these prices. For other forecast and planning purposes, particularly related to merger and acquisition activities, our management considers other price scenarios. These changes, however, do not affect the preparation of our financial statements.

For the years 2020, 2019 and 2018, we have used reserve estimates based on current average prices for the most recent three years then ended to determine amortization of mine development and intangible assets.

We periodically reevaluate estimates of our ore reserves, which represent our estimate as to the amount of unmined copper remaining in our existing mine locations that can be produced and sold at a profit. These estimates are based on engineering evaluations derived from samples of drill holes and other openings, combined with assumptions about copper market prices and production costs at each of our mines.

The persons responsible for ore reserve calculations are as follows:

Peruvian open-pit:

Cuajone mine – Julio Sagua Canqui, Mine Engineering Superintendent

Toquepala mine - Wilbert Perez, Mine Engineering Superintendent

Tia Maria project:

Jaime Arana Murriel, Investment Projects Leaching Manager

Mexican open-pit:

La Caridad Mine - Víctor Manuel Morales Medina, Operations Director

Buenavista mine - Jesus Molinares, Engineering and Mine Planning Superintendent

IMMSA unit:

Santa Barbara - Raul Guerrero Valdez, Manager

Charcas - Juan Jose Aguilar, Planning and Control Superintendent

Santa Eulalia - Primitivo Juarez Mendoza, Geology Manager

Taxco - Jorge Mario Espinosa, Manager

San Martin – Jose Leobardo Palomo Lopez, Manager

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El Arco project:

Michelle P. Cerecer A., Planning Engineer (with support of Hexagon Mining Inc.)

El Pilar project:

Michelle P. Cerecer A., Planning Engineer (with support of Hexagon Mining Inc.)

Pilares project:

Michelle P. Cerecer A., Planning Engineer (with support of Hexagon Mining Inc.)

On October 31, 2018, the SEC adopted new technical disclosure requirements applicable to companies engaged in material mining operations, including royalty companies. These new rules are based on the Committee for Mineral Reserves International Reporting Standards (CRIRSCO) and will replace the SEC Industry Guide 7. The new rules are effective for the fiscal year beginning on or after January 1, 2021. The Company has designed an implementation plan and formed a cross-functional implementation team that include external mining experts as required by the rule. This team is performing a completeness assessment of the Company’s mining operations to establish new policies, procedures and internal controls as mandated by the new standard.

For more information regarding our reserve estimates, please see Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates—Ore Reserves.”

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Ore Reserves Estimated at Current Prices:

The table below provides details on our estimated proven and probable copper and molybdenum reserves as of December 31, 2020 based on average market prices for the last three-year period, in accordance with SEC guidance:

	PERUVIAN OPEN‑PIT				MEXICAN OPEN‑PIT
	UNIT				UNIT				TOTAL		MEXICAN		DEVELOPMENT
	Cuajone		Toquepala		Buenavista		La Caridad		OPEN‑PIT		IMMSA		PROJECTS
	Mine(1)		Mine(1)		Mine(1)		Mine(1)		MINES		UNIT(2)		Tia Maria		El Arco		El Pilar		Pilares
Mineral Reserves
Metal prices:
Copper ($/lb.)	2.816		2.816		2.816		2.816		2.816		2.816		2.816		2.816		2.816		2.816
Molybdenum ($/lb.)	10.661		10.661		10.661		10.661		10.661						10.661
Cut‑off grade	0.217	%	0.205	%	0.151	%	0.113	%	0.163	%			0.100	%	0.190	%	0.150	%	0.140	%
Proven
Sulfide ore reserves (kt)	891,552		2,221,290		2,967,372		2,060,083		8,140,297		18,177				1,392,062				13,042
Average grade:
Copper	0.568	%	0.505	%	0.435	%	0.235	%	0.418	%	0.470	%			0.437	%			0.771	%
Molybdenum	0.019	%	0.029	%	0.006	%	0.031	%	0.020	%					0.007	%
Lead											1.227	%
Zinc											2.698	%
Leachable material (kt)	22		458,981		1,511,392		449,048		2,419,443				213,600		187,617		264,401		252
Leachable material grade	0.558	%	0.185	%	0.153	%	0.189	%	0.166	%			0.329	%	0.332	%	0.303	%	0.241	%
Probable
Sulfide ore reserves (kt)	727,835		235,200		1,437,754		1,090,788		3,491,577		29,420				1,019,671				30,974
Average grade:
Copper	0.397	%	0.317	%	0.385	%	0.214	%	0.329	%	0.585	%			0.396	%			0.693	%
Molybdenum	0.016	%	0.011	%	0.006	%	0.030	%	0.016	%					0.007	%
Lead											0.962	%
Zinc											2.832	%
Leachable material (kt)	896		1,027,667		619,638		167,328		1,815,529				527,151		65,283		9,426		926
Leachable material grade	0.613	%	0.126	%	0.136	%	0.181	%	0.135	%			0.365	%	0.161	%	0.287	%	0.252	%
Total
Sulfide ore reserves (kt)	1,619,387		2,456,490		4,405,126		3,150,871		11,631,874		47,597				2,411,733				44,016
Average grade:
Copper	0.491	%	0.487	%	0.419	%	0.228	%	0.391	%	0.541	%			0.420	%			0.716	%
Molybdenum	0.018	%	0.027	%	0.006	%	0.030	%	0.019	%					0.007	%
Lead											1.063	%
Zinc											2.781	%
Leachable material (kt)	918		1,486,648		2,131,030		616,376		4,234,972				740,751		252,900		273,827		1,178
Leachable material grade	0.612	%	0.144	%	0.148	%	0.187	%	0.152	%			0.354	%	0.288	%	0.303	%	0.250	%
Waste (kt)	4,419,530		8,117,853		5,903,083		2,558,925		20,999,391				662,917		2,107,694		524,290		148,971
Total material (kt)	6,039,835		12,060,991		12,439,239		6,326,172		36,866,237		47,597		1,403,668		4,772,327		798,117		194,165
Stripping ratio ((W+L)/O)	2.73		3.91		1.82		1.01		2.17						0.98				3.41
Stripping ratio (W/(L+O))	2.73		2.06		0.90		0.68		1.32				0.89		0.79		1.91		3.30
Leachable material
Reserves in stock (kt)	20,449		1,700,371		1,945,452		924,329		4,590,601
Average copper grade	0.502	%	0.154	%	0.158	%	0.241	%	0.175	%
In pit reserves:
Proven (kt)	22		458,981		1,511,392		449,048		2,419,443				213,600		187,617		264,401		252
Average copper grade	0.558	%	0.185	%	0.153	%	0.189	%	0.166	%			0.329	%	0.332	%	0.303	%	0.241	%
Probable (kt)	896		1,027,667		619,638		167,328		1,815,529				527,151		65,283		9,426		926
Average copper grade	0.613	%	0.126	%	0.136	%	0.181	%	0.135	%			0.365	%	0.161	%	0.287	%	0.252	%
Total leachable reserves (kt)	21,367		3,187,019		4,076,482		1,540,705		8,825,573				740,751		252,900		273,827		1,178
Average copper grade	0.507	%	0.149	%	0.153	%	0.219	%	0.164	%			0.355	%	0.288	%	0.302	%	0.250	%
Copper contained in ore reserves in pit(kt)(3)	7,957		14,104		21,611		8,337		52,009		257		2,622		10,858		830		318

kt = Thousand tons

W= Waste, L= Leachable material; O= Ore.

(1) The Cuajone, Toquepala, Buenavista and La Caridad concentrator recoveries calculated for these reserves were 83.76%, 87.24%, 82.60%, and 81.13%, respectively, obtained by using recovery formulas according to the different milling capacity and geo-metallurgical zones.

(2) The IMMSA unit includes the Charcas, Santa Barbara, San Martin, Santa Eulalia and Taxco mines. Zinc and lead contained in ore reserves are as follows:

(in thousand tons)	Proven	Probable	Total
Zinc	490.4	833.2	1,323.6
Lead	223.0	283.0	506.1

(3) Copper contained in ore reserves for open-pit mines is (i) the product of sulfide ore reserves and the average copper grade proven plus (ii) the product of sulfide ore reserves and the average copper grade probable plus (iii) the product of in-pit leachable reserves and the average copper grade. Copper contained in ore reserves for underground mines is the product of sulfide ore reserves and the average copper grade.

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Metal Price Sensitivity:

In preparing the sensitivity analysis, we recalculated our reserves based on the assumption that current average metal prices were 20% higher and 20% lower, respectively, than the actual current average prices for year-end 2020. Reserve results of this sensitivity analysis are not proportional to the increase or decrease in metal price assumptions.

	INCREASE—20%						DECREASE—20%
	Open‑Pit				Development		Open‑Pit				Development
	Mines		IMMSA		Projects		Mines		IMMSA		Projects
Mineral Reserves
Metal prices:
Copper ($/lb.)	3.379		3.379		3.379		2.253		2.253		2.253
Molybdenum ($/lb.)	12.793				12.793		8.529				8.529
Cut‑off grade	0.138	%			0.153	%	0.204	%			0.250	%
Proven
Sulfide ore reserves (kt)	9,006,279		19,037		1,439,535		6,382,291		15,945		1,343,049
Average grade:
Copper	0.403	%	0.461	%	0.432	%	0.455	%	0.491	%	0.454	%
Molybdenum	0.019	%			0.007	%	0.021	%			0.007	%
Lead			1.197	%					1.290	%
Zinc			2.635	%					2.862	%
Leachable material (kt)	2,053,422				696,490		2,933,979				572,761
Leachable material grade	0.148	%			0.315	%	0.190	%			0.329	%
Probable
Sulfide ore reserves (kt)	4,147,939		30,952		1,128,249		2,389,143		25,509		906,579
Average grade:
Copper	0.313	%	0.567	%	0.390	%	0.374	%	0.640	%	0.430	%
Molybdenum	0.015	%			0.007	%	0.015	%			0.007	%
Lead			0.942	%					1.011	%
Zinc			2.766	%					2.866	%
Leachable material (kt)	1,798,715				620,888		1,638,699				558,061
Leachable material grade	0.120	%			0.337	%	0.152	%			0.347	%
Total
Sulfide ore reserves (kt)	13,154,218		49,989		2,567,784		8,771,434		41,454		2,249,628
Average grade:
Copper	0.375	%	0.526	%	0.413	%	0.433	%	0.583	%	0.444	%
Molybdenum	0.018	%			0.007	%	0.019	%			0.007	%
Lead			1.039	%					1.118	%
Zinc			2.716	%					2.864	%
Leachable material (kt)	3,852,137				1,317,378		4,572,678				1,130,822
Leachable material grade	0.135	%			0.325	%	0.176	%			0.338	%
Waste (kt)	24,027,887				3,819,724		16,129,708				2,774,044
Total material (kt)	41,034,242		49,989		7,704,886		29,473,820				6,154,494
Stripping ratio ((W+L)/O)	2.12				2.00		2.36				1.74
Stripping ratio (W/(L+O))	1.41				0.98		1.21				0.82
Leachable material
Reserves in stock (kt)	4,590,601				—		4,590,601				—
Average copper grade	0.175	%			—		0.175	%			—
In pit reserves:
Proven (kt)	2,053,422				696,490		2,933,979				572,761
Average copper grade	0.148	%			0.315	%	0.190	%			0.329	%
Probable (kt)	1,798,715				620,888		1,638,699				558,061
Average copper grade	0.120	%			0.337	%	0.152	%			0.347	%
Total leachable reserves (kt)	8,442,738				1,317,378		9,163,279				1,130,822
Average copper grade	0.157	%			0.326	%	0.176	%			0.338	%
Copper contained in ore reserves in pit(kt)(1)	54,567		263		14,900		46,040		242		13,818

(1) Copper contained in ore reserves for open-pit mines is (i) the product of sulfide ore reserves and the average copper grade proven plus (ii) the product of sulfide ore reserves and the average copper grade probable plus (iii) the product of in-pit leachable reserves and the average copper grade. Copper contained in ore reserves for underground mines is the product of sulfide ore reserves and the average copper grade.

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Internal Ore Reserves Estimates:

The table below provides details on our proven and probable copper and molybdenum reserves as of December 31, 2020, which are estimated based on long-term price assumptions of $3.00 per pound of copper, $9.00 per pound of molybdenum and $19.00 per ounce of silver. As discussed on page 54, the internal ore reserve estimates as presented are not compliant with SEC requirements, given that long-term price assumptions differ from the current prices used pursuant to SEC guidance. These internal ore reserve estimates do not affect the preparation of our financial statements.

	PERUVIAN OPEN‑PIT				MEXICAN OPEN‑PIT
	UNIT				UNIT				TOTAL		MEXICAN		DEVELOPMENT
	Cuajone		Toquepala		Buenavista		La Caridad		OPEN‑PIT		IMMSA		PROJECTS
	Mine		Mine		Mine		Mine		MINES		UNIT(1)		Tia Maria		El Arco		El Pilar		Pilares
Mineral Reserves
Metal prices:
Copper ($/lb.)	3.000		3.000		3.000		3.000		3.000		3.000		3.000		3.000		3.000		3.000
Molybdenum ($/lb.)	9.000		9.000		9.000		9.000		9.000						9.000
Cut‑off grade	0.203	%	0.192	%	0.132	%	0.104	%	0.149	%			0.100	%	0.188	%	0.150	%	0.142	%
Proven
Sulfide ore reserves(kt)	892,550		2,348,667		3,320,189		2,118,919		8,680,325		17,736				1,385,642				13,042
Average grade:
Copper	0.566	%	0.496	%	0.411	%	0.233	%	0.406	%	0.476	%			0.439	%			0.771	%
Molybdenum	0.019	%	0.028	%	0.006	%	0.031	%	0.019	%					0.007	%
Lead											1.233	%
Zinc											2.714	%
Leachable material (kt)	22		384,767		1,179,435		450,318		2,014,542				218,016		187,617		271,101		252
Leachable material grade	0.558	%	0.174	%	0.138	%	0.189	%	0.156	%			0.325	%	0.332	%	0.302	%	0.241	%
Probable
Sulfide ore reserves(kt)	753,833		290,087		1,596,709		1,158,754		3,799,383		28,690				1,012,287				30,974
Average grade:
Copper	0.389	%	0.308	%	0.367	%	0.215	%	0.321	%	0.597	%			0.398	%			0.693	%
Molybdenum	0.016	%	0.010	%	0.006	%	0.030	%	0.015	%					0.007	%
Lead											0.971	%
Zinc											2.815	%
Leachable material (kt)	900		1,032,952		501,734		172,979		1,708,565				533,037		65,283		9,648		926
Leachable material grade	0.612	%	0.121	%	0.124	%	0.180	%	0.128	%			0.362	%	0.161	%	0.286	%	0.252	%
Total
Sulfide ore reserves(kt)	1,646,383		2,638,754		4,916,898		3,277,673		12,479,708		46,426		—		2,397,929		—		44,016
Average grade:
Copper	0.485	%	0.475	%	0.397	%	0.226	%	0.380	%	0.551	%			0.422	%			0.716	%
Molybdenum	0.018	%	0.026	%	0.006	%	0.031	%	0.018	%					0.007	%
Lead											1.072	%
Zinc											2.776	%
Leachable material (kt)	922		1,417,719		1,681,169		623,297		3,723,107				751,053		252,900		280,749		1,178
Leachable material grade	0.611	%	0.135	%	0.134	%	0.187	%	0.143	%			0.351	%	0.288	%	0.301	%	0.250	%
Waste (kt)	4,641,332		8,562,116		6,229,289		2,726,038		22,158,775				684,804		2,121,497		540,154		148,971
Total material (kt)	6,288,637		12,618,589		12,827,356		6,627,008		38,361,590		46,426		1,435,857		4,772,326		820,903		194,165
Stripping ratio ((W+L)/O)	2.82		3.78		1.61		1.02		2.07						0.99				3.41
Stripping ratio (W/(L+O))	2.82		2.11		0.94		0.70		1.37				0.91		0.80		1.92		3.30
Leachable material
Reserves in stock (kt)	20,449		1,700,371		1,945,452		924,329		4,590,601
Average copper grade	0.502	%	0.154	%	0.158	%	0.241	%	0.175	%
In‑pit reserves:
Proven (kt)	22		384,767		1,179,435		450,318		2,014,542				218,016		187,617		271,101		252
Average copper grade	0.558	%	0.174	%	0.138	%	0.189	%	0.156	%			0.325	%	0.332	%	0.302	%	0.241	%
Probable(kt)	900		1,032,952		501,734		172,979		1,708,565				533,037		65,283		9,648		926
Average copper grade	0.612	%	0.121	%	0.124	%	0.180	%	0.128	%			0.362	%	0.161	%	0.286	%	0.252	%
Total leachable reserves	21,371		3,118,090		3,626,621		1,547,626		8,313,708				751,053		252,900		280,749		1,178
Average copper grade	0.507	%	0.145	%	0.147	%	0.219	%	0.161	%			0.351	%	0.288	%	0.301	%	0.250	%
Copper contained in ore reserves (kt)(2)	7,991		14,448		21,773		8,573		52,785		256		2,636		10,848		845		318

(kt) = Thousand tons

W= Waste, L= Leachable material; O= Ore.

(1) The IMMSA unit includes the Charcas, Santa Barbara, San Martin, Santa Eulalia and Taxco mines. Zinc and lead contained in ore reserves are as follows:

(in thousand tons)	Proven	Probable	Total
Zinc	481.4	807.5	1,288.9
Lead	218.7	278.6	497.3

Copper contained in ore reserves for open-pit mines is (i) the product of sulfide ore reserves and the average copper grade plus (ii) the product of in-pit leachable reserves and the average grade of copper. Copper contained in ore reserves for underground mines is the product of sulfide ore reserves and the average copper grade.

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OVERVIEW OF BLOCK MODEL RECONCILIATION PROCESS

We apply the following block model to mill reconciliation procedure.

The following stages are identified at the Cuajone, Toquepala, Buenavista and La Caridad mines:

1. The mine geologists gather the necessary monthly statistical data from our information system (“SRP”), which provides ore tons milled and ore grades in the concentrator.

2. Mined areas are topographically determined and related boundaries are built.

3. Using the “interactive planner” option in our mining software (MineSight), ore tons and grades are calculated inside mined areas over the block model. At this point the current cut-off grade is considered.

4. In the final stage, accumulated tons mined, weighted average grade for ore material and leach is compared to data coming from our SRP system.

Tonnage and grade reconciliation for 2020 are as follows:

	Long Range Model		Mill		Variance
	Tons		Tons		Tons
Mine	(thousands)	% Copper	(thousands)	% Copper	(thousands)	% Copper
Cuajone	30,113	0.650	30,183	0.666	70	0.016
Toquepala	37,095	0.626	39,382	0.634	2,287	0.008
Buenavista	72,653	0.522	72,895	0.527	242	0.005
La Caridad	30,147	0.343	34,949	0.361	4,802	0.018

If the estimation error appears greater than 3%, a detailed evaluation is conducted to review the differences, which normally could result in more in-fill drilling, to better understand the geological characteristics (grade, rock type, mineralization and alteration) and the spacing of drill holes that are considered in the ore body zone.

AVERAGE DRILL-HOLE SPACING

The following is the average drill-hole spacing for proven and probable sulfide reserves as of December 31, 2020:

	Proven	Probable
	(average spacing
	in meters)
Cuajone	68.33	103.89
Toquepala	74.64	114.54
Buenavista	53.17	105.67
La Caridad	46.52	104.71

EXPLORATION ACTIVITIES

We are engaged in ongoing extensive exploration to locate additional ore bodies in Peru, Mexico, Argentina, Ecuador and Chile. We also conduct exploration in the areas of our current mining operations. We invested $32.6 million on exploration programs in 2020, $30.0 million in 2019 and $29.6 million in 2018 and we expect to spend approximately $61.2 million on exploration programs in 2021.

Currently, we directly control 59,252 hectares and 503,104 hectares of exploration concessions in Peru and Mexico, respectively. We also currently hold 229,312 hectares, 27,353 hectares and 7,299 hectares of exploration concessions in Argentina, Chile and Ecuador, respectively.

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Peru

Los Chancas. This property, located in the department of Apurimac in southern Peru, is a copper and molybdenum porphyry deposit. Current estimates indicate the presence of 545 million tons of mineralized material with a copper content of 0.59%, molybdenum content of 0.04% and 0.039 grams of gold per ton and 181 million tons of mineralized leachable material with a total copper content of 0.357%. In 2019 and 2020, we developed social and environmental improvements for local communities. In 2021, we plan to continue with these activities and to conclude the environmental impact assessment of the project.

Michiquillay. This property, located in the district of La Encañada, in the province and department of Cajamarca in northern Peru, is a copper porphyry deposit. In February 2018, we won the public bidding process for the project, and in June 2018 we signed the acquisition contract with the Peruvian government. In 2019, we developed social and environmental programs for the local communities and in 2020, we are concluding the semi-detailed environmental impact assessment. This will allow us to begin a 50,000-meter diamond drilling program in 2021 to verify and update the estimated mineralized materials of the project. We also plan to continue developing social programs for the local communities.

Other Peruvian Prospects. In 2020, we drilled 547 meters to complete a 13,000-meter diamond drilling program to explore various geochemical and geophysical anomalies. The results obtained indicate an iron system with low contents of disseminated copper.

For 2021, we plan to conduct a diamond drilling program of 15,500 meters at four prospects in southern Peru that have shown evidence of copper porphyry deposits. Additionally, we will continue conducting several prospection programs at other Peruvian metallogenic zones, which were identified in 2020.

Mexico

In addition to exploration and drilling programs at existing mines, we are currently conducting exploration to locate mineral deposits at various other sites in Mexico. The following are some of the more significant exploration projects:

Buenavista-Zinc. The Buenavista-Zinc site is located in the state of Sonora, Mexico and is part of the northwest Buenavista ore body. It is a skarn deposit containing zinc, copper, silver and lead sulfide mineralization. The deposit contains approximately 102.6 million tons of mineralized material, containing 1.88% of zinc, 0.47% of copper and 17 grams of silver per ton. In 2016, we reviewed the geological model of the deposit and the lithological description of prior drill holes, which were analyzed using infrared spectrometry. The results were included in the reserves database. Currently, we have concluded the conceptual design of the flotation plant. Additionally, the mining plan and economic studies have been prepared by external companies. In 2020, exploration was concluded at the Buenavista-Zinc site. In 2021, we expect to conduct a 5,000-meter drilling program at the Elisa-Puertecitos project, which is immediately northeast of Buenavista-Zinc.

The Chalchihuites. This is a skarn type deposit located in the state of Zacatecas, close to the San Martin mining unit. Drilling programs conducted between 1980 and 2014 identified 12.6 million of mineralized material with an average silver content of 110 grams per ton, 2.66% of zinc, 0.37% of lead and 0.67% of copper. Current results indicate that mineralization consists of a complex mixture of oxides and sulfides of silver, lead and zinc that requires additional metallurgical research. In 2017, we started a new drilling program of 21,000 meters to continue metallurgical research and testing. In 2018, this exploration program, which included 48 drill holes was completed. This program has been carried out in compliance with QA/QC protocol, which includes testing the specific density of different rocks and mineralized types and geochemistry sampling. In addition, 5,000 meters of core sample from the drilling program were analyzed with a hyperspectral scanner, and a study of 498 kilometers of hyperspectral imaging was conducted to recognize the geology of the entire Chalchihuites mineral district. In 2019, with the complete data from the diamond drilling program, we made a geological model of the Cronos deposit using Leapfrog software. In 2020, the sample design for a metallurgical test was completed and three metallurgical samples were delivered to an external consultant. We expect to conduct this test in 2021.

61

Bella Union (La Caridad). This prospect is a mineralized copper and molybdenum breccia deposit; the site is located at less than one kilometer from the border of La Caridad pit. In 2016 and 2017, we conducted a 28,217 meter drilling program to define the geometry of the deposit. The results identified 36.2 million tons of mineralized material with an average of 0.44% copper content and 0.05% of molybdenum. In May 2018, the drilling in this project was completed, totaling 46,400 meters distributed in 113 drill holes. The test results were received in June 2018. Currently, exploration at Bella Union has been completed and external consultants are working to integrate the information of this prospect into the life plan for the La Caridad-Pilares mines.

Campo Medio (Santa Eulalia). This prospect is located close to the west border of the Santa Eulalia mine. Results of geological surveying and drilling programs indicated that its mineralization consists of sulfides with 2.85 meters of width, 219 grams of silver, 6.60% of lead and 7.55% of zinc. Exploration at the Campo Medio area did not render positive results and exploration activities were suspended. In order to continue exploration towards the southern end of the San Antonio mine, the area must be drained because it was affected by flooding at Santa Eulalia.

Chile

El Salado (Montonero). A copper-gold prospect located in the Atacama region, northern Chile has been under exploration for copper and molybdenum porphyry since 2014. In 2016, we conducted a diamond drilling program of 12,169 meters to define mineral classification. In 2017, we drilled a total of 9,939 meters and finished the conceptual study. In 2021, we plan to conduct a pre-feasibility study of the project.

Other Chilean Prospects. In 2020, we concluded exploration work at the Cobre Sol prospect, a copper porphyry prospect located in the Antofagasta region. We conducted three diamond drilling programs, which totaled 798 meters and the results did not meet our objectives. In 2021, we plan to conduct a diamond drilling program of 12,000 meters at three prospects located in the copper-gold strip of the Antofagasta region in the north of Chile.

Ecuador

Chaucha. The Ruta del Cobre (“Copper Road”) project is located west of Cuenca city and south of Guayaquil. The mineralization in this area is characteristic of a copper-molybdenum porphyry system which is being explored since 2014. Through 2019, the exploration phase concluded with a total of 79,900 meters drilled. In 2020, we continued the infill-drilling program, where we conducted 35,400 meters of diamond drilling to reclassify the project’s existing mineralized materials. In 2021, we plan to drill an additional 30,000 meters to conclude the infill-drilling program and begin the project’s feasibility study.

Argentina

In 2011, we started exploration activities in Argentina. In 2015, we performed geological exploration in the Salta, Rio Negro and Neuquen provinces where we expected to locate copper porphyry with precious metals epithermal systems. In 2017, we performed prospection and geological evaluation work in the provinces of San Juan and Rio Negro. In 2019, we conducted a diamond drilling program of 2,530 meters to continue exploring the silver-gold epithermal systems, denominated the Caldera project, located in the Rio Negro province. In 2020, we conducted geological mapping and surface sampling work in these areas. In 2021, we plan to conduct further exploration work, mainly at the Cerro La Mina and Tanque Negro prospects.

Cañadon del Moro. This is a low sulfidation epithermal deposit with high longitude seams located in the Rio Negro province. We have defined an epithermal deposit of silver of potential economic interest with an estimated grade of 9.46 ounces of silver per metric ton. In 2021, we plan to drill an additional 5,000 meters to continue exploring the prospective and potential minerals.

In 2021, we also plan to conduct a diamond drilling program of 4,000 meters at the Esperanza project, located in the Rio Negro province. In addition, in 2021 we plan to conduct exploration programs of 3,000 meters and 2,000 meters at the La Hoyada and La Chilena prospects respectively; both are located in the province of Catamarca.

62

ITEM 3. LEGAL PROCEEDINGS

Reference is made to the information under the caption “Litigation Matters” in the consolidated financial statement Note 13 “Commitments and contingencies.”

ITEM 4. MINE SAFETY DISCLOSURE

Not applicable.

63

PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

SCC COMMON STOCK:

SCC’s common stock is traded on the New York Stock Exchange (“NYSE”) and the Lima Stock Exchange (“BVL”). SCC’s common stock symbol is SCCO on both the NYSE and the BVL. At December 31, 2020, there were 871 holders of record of our common stock.

DIVIDEND AND STOCK MARKET PRICES:

The table below contains information on the cash dividends paid per share of capital stock and the high and low stock prices on both the NYSE and the BVL for the periods indicated.

	For the year 2020
	Dividend		NYSE:				BVL:
Quarters	per Share		High		Low		High		Low
1st	$	0.40	$	44.41	$	23.53	$	44.23	$	24.29
2nd	$	0.20	$	39.77	$	26.54	$	39.50	$	26.82
3rd	$	0.40	$	48.52	$	38.59	$	48.32	$	38.60
4th	$	0.50	$	65.82	$	44.49	$	65.90	$	45.85
Year	$	1.50	$	65.82	$	23.53	$	65.90	$	24.29

	For the year 2019
	Dividend		NYSE:				BVL:
Quarters	per Share		High		Low		High		Low
1st	$	0.40	$	39.68	$	29.21	$	39.77	$	29.20
2nd	$	0.40	$	41.84	$	33.27	$	41.85	$	33.14
3rd	$	0.40	$	38.49	$	29.53	$	38.10	$	29.75
4th	$	0.40	$	43.19	$	32.35	$	43.00	$	32.50
Year	$	1.60	$	43.19	$	29.21	$	43.00	$	29.20

For a description of limitations on our ability to make dividend distributions, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—“Liquidity and Capital Resources” and Note 11 “Financing” to the consolidated financial statements.

DIRECTORS’ STOCK AWARD PLAN

The following table contains certain information related to our shares held as treasury stock for the Directors’ stock award plan as of December 31, 2020:

Equity Compensation Plan Information

	Number of securities to be	Weighted-average	Number of securities
	issued upon exercise of	exercise price of	remaining available
Plan Category	outstanding options	outstanding options	for future issuance
Directors’ stock award plan	N/A	N/A	208,400

For additional information see Note 14—“Stockholders Equity—Directors’ Stock Award Plan.”

64

SCC COMMON STOCK REPURCHASE PLAN:

In 2008, our BOD authorized a $500 million share repurchase program that has since been increased by the BOD and is currently authorized to $3 billion. Pursuant to this program, the Company purchased common stock as shown in the table below. These shares are available for general corporate purposes. The Company may purchase additional shares of its common stock from time to time, based on market conditions and other factors. This repurchase program has no expiration date and may be modified or discontinued at any time.

Period
					Total	Maximum
					Number of	Number of
					Shares	Shares that
		Total			Purchased	May Yet Be
		Number of	Average		as Part of	Purchased
		Shares	Price Paid		Publicly	Under the	Total Cost
From	To	Purchased	per Share		Announced Plan	Plan @ $65.12(1)	($ in millions)
2008	2012	46,914,486	$	18.72	46,914,486			878.1
2013:		10,245,000		27.47	57,159,486			281.4
2014:		22,711,428		30.06	79,870,914			682.8
2015:		36,689,052		27.38	116,559,966			1,004.4
2016:		2,937,801		24.42	119,497,767			71.7
Total purchased		119,497,767	$	24.42		1,253,583	$	2,918.4

(1) NYSE closing price of SCC common shares at December 31, 2020.

The SCC share repurchase program has registered no activity since the third quarter of 2016. The NYSE closing price of SCC common shares at December 31, 2020 was $65.12 and the maximum number of shares that the Company could purchase at that price was 1.3 million shares.

As a result of the repurchase of shares of SCC’s common stock, Grupo Mexico’s direct and indirect ownership was 88.9% as of December 31, 2020 and 2019.

SHAREHOLDER RETURN PERFORMANCE PRESENTATION

Set forth below is a line graph comparing the yearly change in the cumulative total returns on the Company’s common stock against cumulative total return on the S&P 500 Stock Index and the S&P Metals and Mining Select Industry Index for the five-year period ending December 31, 2020. The chart below analyzes the total return on SCC’s common stock for the period commencing December 31, 2015 and ending December 31, 2020, compared to the total return of the S&P 500 and the S&P Metals and Mining Select Industry Index for the same five-year period.

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Comparison of Five Year Cumulative Total Return *

SCC Stock, S&P 500 Index and S&P Metals and Mining Select Industry Index **

* Total return assumes reinvestment of dividends

** The comparison assumes $100 invested on December 31, 2015

	Total Return per Year
	2016		2017		2018		2019		2020
SCC	23.1	%	50.8	%	(33.0)	%	44.6	%	59.0	%
S&P 500	9.5	%	19.4	%	(6.2)	%	28.9	%	16.3	%
S&P M + MS	102.4	%	19.4	%	(27.0)	%	13.0	%	14.4	%

The foregoing Performance Graph and related information shall not be deemed “soliciting material” or “filed” with the SEC or subject to Section 18 of the Securities Exchange Act of 1934, as amended, nor shall such information be incorporated by reference into any future filing under the Securities Act of 1933 or Securities Exchange Act of 1934, each as amended, except to the extent that the Company specifically incorporates it by reference into such filing.

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ITEM 6. SELECTED FINANCIAL DATA

FIVE-YEAR SELECTED FINANCIAL AND STATISTICAL DATA

The selected historical financial data presented below as of and for the five years ended December 31, 2020, includes certain information that has been derived from the consolidated financial statements. The selected financial data should be read in conjunction with Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and the consolidated financial statements and notes thereto. The financial data is presented in millions, except per share and capital stock amounts and financial ratios.

	Year Ended December 31,
Statement of Earnings Data	2020		2019		2018		2017		2016
Net sales(1)	$	7,984.9	$	7,285.6	$	7,096.7	$	6,654.5	$	5,379.8
Operating income		3,120.7		2,753.0		2,881.2		2,618.9		1,564.2
Net income		1,577.8		1,491.9		1,548.2		732.4		778.8
Net income attributable to:
Non-controlling interest		7.4		6.1		5.2		3.9		2.3
Southern Copper Corporation	$	1,570.4	$	1,485.8	$	1,543.0	$	728.5	$	776.5
Per share amounts:
Earnings basic and diluted	$	2.03	$	1.92	$	2.00	$	0.94	$	1.00
Dividends paid	$	1.50	$	1.60	$	1.40	$	0.59	$	0.18

	As of December 31,
Balance Sheet Data	2020		2019		2018		2017		2016
Cash and cash equivalents	$	2,183.6	$	1,925.1	$	844.6	$	1,004.8	$	546.0
Total assets(2)		16,946.5		16,407.4		14,267.8		13,780.1		13,234.3
Total long-term debt, including current portion(2)		6,544.2		6,541.0		5,960.1		5,957.1		5,954.2
Total liabilities(2)		9,670.5		9,549.2		7,655.0		7,630.7		7,363.4
Total equity	$	7,276.0	$	6,858.2	$	6,612.8	$	6,149.4	$	5,870.9

	Year Ended December 31,
Statement of Cash Flows Data	2020		2019		2018		2017		2016
Net income	$	1,577.8	$	1,491.9	$	1,548.2	$	732.4	$	778.8
Depreciation, amortization and depletion		775.6		764.4		674.3		671.1		647.1
Cash provided by operating activities		2,783.6		1,911.9		2,235.1		1,976.6		923.1
Capital investments(3)		(592.2)		(707.5)		(1,121.4)		(1,023.5)		(1,118.5)
Debt repaid		(400.0)		—		—		—		—
Debt incurred		—		987.3		—		—		—
Dividends paid to common stockholders		(1,159.6)		(1,236.9)		(1,082.3)		(456.1)		(139.3)
SCC common shares buyback		—		—		—		—		(71.7)
Increase (decrease) in cash and cash equivalents	$	258.5	$	1,080.5	$	(160.2)	$	458.8	$	271.5

	Year Ended December 31,
Capital Stock	2020		2019		2018		2017		2016
Common shares outstanding—basic and diluted (in thousands)		773,065		773,059		773,044		773,028		773,016
NYSE Price—high	$	65.82	$	43.19	$	57.34	$	47.63	$	34.98
NYSE Price—low	$	23.53	$	23.21	$	29.78	$	32.38	$	22.29
Book value per share		9.35		8.82		8.50		7.90		7.54
P/E ratio(4)		32.06		22.10		15.42		50.35		31.82

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	Year Ended December 31,
Financial Ratios	2020		2019		2018		2017		2016
Gross margin(5)	41.10	%	40.0	%	42.5	%	41.0	%	31.6	%
Operating income margin(6)	39.10	%	37.8	%	40.6	%	39.4	%	29.1	%
Net margin(7)	19.70	%	20.4	%	21.7	%	10.9	%	14.4	%
Current assets to current liabilities	3.50		2.83		2.61		2.71		2.57
Net debt/Net capitalization(8)	35.2	%	41.8	%	42.6	%	44.4	%	47.7	%
Total debt/Total capitalization(9)	47.4	%	50.3	%	47.4	%	49.2	%	50.4	%

(1) Please see copper and metal prices for the last 10 years on Item 1 “Business—Metal Prices” and sales volumes for the last three years on Item 7 “Management Discussion and Analysis of Financial Condition and Results of Operations—Segments Results Analysis.”

(2) In January 2019, the Company adopted ASC 842, recognizing right-of-use assets and the corresponding operating lease liabilities on the consolidated balance sheet. The Company elected the transition approach.

(3) Please see Item 7 “Management Discussion and Analysis of Financial Condition and Results of Operations—Capital Investment Program.”

(4) Represents closing Price divided by Earnings per share.

(5) Represents net sales less cost of sales (including depreciation, amortization and depletion), divided by net sales, as a percentage.

(6) Represents operating income divided by net sales, as a percentage.

(7) Represents net income divided by net sales, as a percentage.

(8) Net debt, which is a Non-GAAP measure, is defined as total debt minus cash, cash equivalents and short-term investments balance. Please see Item 7 “Management Discussion and Analysis of Financial Condition and Results of Operations—Financing Section”. During 2015, management decided to include short-term investments as a reduction to debt to arrive at net debt given that the Company can liquidate these investments at any time as needed.

Net capitalization is defined as Net debt plus Equity.

Net debt/Net capitalization: represents net debt divided by net debt plus equity. Net debt to net capitalization is a Non-GAAP measure. This non-GAAP information should not be considered in isolation or as substitute for measures of performance determined in accordance with GAAP. A reconciliation of our net debt to net capitalization ratio to total debt and capitalization as presented in the consolidated balance sheet is presented under the subheading “Non-GAAP information reconciliation” in Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

(9) Total capitalization is defined as Total debt plus Equity.

Total debt/Total capitalization: represents total debt divided by total debt plus equity.

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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

EXECUTIVE SUMMARY

This Management’s Discussion and Analysis of Financial Condition and Results of Operations relates to and should be read together with our Audited Consolidated Financial Statements as of and for each of the years in the three-year period ended December 31, 2020. Therefore, unless otherwise noted, the discussion below of our financial condition and results of operations is for Southern Copper Corporation and its subsidiaries (collectively, “SCC,” “Southern Copper,” “the Company,” “our,” and “we”) on a consolidated basis for all periods. Our financial results may not be indicative of our future results.

This discussion contains forward-looking statements that are based on management’s current expectations, estimates and projections about our business and operations. Our actual results may differ materially from those currently anticipated and expressed in the forward-looking statements as a result of a number of factors. See Item 1 “Business—Cautionary Statement.”

EXECUTIVE OVERVIEW

Business: Our business is primarily the production and sale of copper. In the process of producing copper, a number of valuable metallurgical by-products are recovered, which we also produce and sell. Market forces outside of our control largely determine the sale prices for our products. Our management, therefore, focuses on value creation through copper production, cost control, production enhancement and maintaining a prudent capital structure to remain profitable. We endeavor to achieve these goals through capital spending programs, exploration efforts and cost reduction programs. Our aim is to remain profitable during periods of low copper prices and to maximize financial performance in periods of high copper prices. We are one of the world’s largest copper mining companies in terms of production and sales and our principal operations are in Peru and Mexico. We also have an active ongoing exploration program in Chile, Argentina and Ecuador.

We believe we hold the world’s largest copper reserve position. As of December 31, 2020, our copper ore reserves, calculated at a copper price of $3.00 per pound, totaled 67.7 million tons of contained copper, at the following locations:

Copper contained in ore reserves	Thousand tons
Mexican open‑pit	30,346
Peruvian operations	22,439
IMMSA	256
Development projects	14,647
Total	67,688

Outlook: Various key factors affect our outcome. These include, but are not limited to, the following:

● Sales structure: In the last three years, approximately 81.0% of our revenues came from the sale of copper, 7.0% from molybdenum, 4.0% from zinc, 5.0% from silver and 3.0% from various other products, including gold, sulfuric acid and other materials.

● Copper: In the last quarter of 2020, the LME copper price increased, from an average of $2.67 per pound in the fourth quarter of 2019 to $3.25 (+21.7%). Currently, we are seeing prices over $3.60 per pound, which bodes a positive outlook for the 2021 copper market. We believe the following factors are influencing the market:

● A worldwide recovery in copper demand for industrial uses, driven mainly by a sustained recovery in economic activity in China and other Asian economies and in the European auto industry.

● Regarding China, it should also be noted that copper scrap imports have decreased by 48% in the last 10 months of 2020, which led to a subsequent increase in Chinese consumption of refined copper.

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● The combined inventories of the LME, Comex, Shanghai and Bonded warehouses closed 2020 at their lowest levels since December 2014.

Given the current market outlook for supply and demand, we have a positive view for this year and for the long-term evolution of the copper market.

● Molybdenum: It represented approximately 6.4% of our sales in 2020. Molybdenum prices averaged $8.57 per pound in 2020, compared to $11.27 in 2019, a 24.0% decrease.

Molybdenum is mainly used to produce special alloys of stainless steel that require significant hardness, corrosion and heat resistance. A new use for this metal is in lubricants and sulfur filtering of heavy oils and shale gas production.

● Zinc: Although average zinc prices decreased in 2020 compared with 2019 (-11.0%), we believe zinc has very good long-term fundamentals due to its significant industrial consumption and expected production. Zinc represented 3.1% of our sales in 2020.

● Silver: We believe that silver prices will have support due to its industrial uses as well as being perceived as a value shelter in times of economic uncertainty. Silver represented 5.6% of our sales in 2020.

● Production: In 2021 and 2022, we expect to produce 943,000 tons of copper given that production during these periods will be affected by a temporary reduction in ore grade and recovery at our Peruvian operations.

We expect our copper production to recover by 2023 and reach 1,031,000 tons of production as we get Peruvian production back on track and generate new production on our Pilares, El Pilar and Buenavista-Zinc Concentrator projects.

We also expect to produce 21.4 million ounces of silver in 2021, in line with 2020 production. In 2021, we expect to produce 76,200 tons of zinc from our mines, up 10.5% from 2020 production level. Additionally, we expect to produce 26,800 tons of molybdenum, which represents a decrease of 11.3% compared to 2020 production levels.

● Capital investments: Capital investments were $592.2 million for 2020. This is 16.3% lower than in 2019, and represented 37.7% of net income. Our growth program to develop the full production potential of our Company is underway. We are currently developing a new organic growth plan to increase our copper volume production to 1.9 million tons by 2028 with the development of new projects.

For 2021, the Board of Directors approved a capital investment program of $1,431.3 million.

COVID-19

In March 2020, the World Health Organization classified the COVID-19 outbreak as a pandemic based on a rapid increase in global transmission rates. The full impact of the COVID-19 outbreak will continue and the magnitude of the impact on the Company’s financial condition, liquidity and future operating results is uncertain. Senior management is actively monitoring the global situation´s effect on the Company´s financial condition, liquidity, operations, suppliers, industry and workforce and is focusing principally on the health, safety and well-being of our employees, their families and the communities where we have operations. As of December 31, 2020, there have been no major delays in the supply of the materials and services critical for operations and sales. In addition, the supply of non-critical materials and services for the operations is gradually being restored. Additionally, shipments of products and collections experienced no known major delays in the fourth quarter of 2020.

As of December 31, 2020, we continued to see a positive trend in the copper price, which closed at $3.51 per pound (LME) after it registered a drop to $2.18 per pound at the end of the first quarter of 2020. Considering the market outlook previously described, we have a positive view for 2021 and for the long-term evolution of the copper market.

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The Company maintains a solid financial position and performance level. We believe this has allowed and will continue to allow us to deal with the effects of the pandemic in a way that prevents adverse material effects on our operations and financial results. The table below compares some of our financial information as of and for the years ended December 31, 2020 and 2019:

	2020	2019
($ in millions, except ratios)
Cash and cash equivalents	2,183.6	1,925.1
Accounts receivable	1,136.6	911.8
Total assets	16,946.5	16,407.4
Long term debt	6,544.2	6,541.0
Sales	7,984.9	7,285.6
RATIOS
Current assets to current liabilities	3.49	2.83
Accounts receivable turnover (1)	7.03	7.99
Total debt ratio (2)	0.39	0.42
Net income margin (3)	19.7%	20.4%

(1) Represents net sales divided by accounts receivable.

(2) Represents total debt divided by total assets.

(3) Represents net income divided by net sales, as a percentage.

Governmental authorities in Mexico and Peru have declared that essential economic activities must continue during the COVID-19 health emergency. These activities include industrial mining and/or any other activity necessary to ensure the provision of essential services such as electricity; provide elements to install medical and hospital infrastructure; and manufacture health-related supplies and technological equipment. We believe that industrial mining stands as the most efficient and timely supplier of inputs that are critical to the productive chain to fight the pandemic.

Given the nature of mining operations, which are highly automated, conducted in remote locations and with mandatory use of personal safety equipment at all the mines, it is easier to implement and comply with COVID-19 protective measures, such as physical isolation and control of access to facilities. Industrial mining uses advanced and reliable machinery and does not require high physical concentration of employees. In many cases, workers fulfill their duties maintaining distances of more than 100 meters from their closest coworkers.

At the present time, our operations are in compliance with all sanitary and government regulations and maintain proper environmental safeguards. Our COVID-19 emergency protocol has reinforced preventive measures such as disinfecting, clinical monitoring before work, cleaning and sanitizing of work areas and respect for social distancing. We have also restricted the access of contractors, suppliers and personnel to our facilities if visits are not indispensable and enforced multiple actions to limit workforce exposure to COVID-19 by imposing travel restrictions, prohibiting face-to-face meetings and urging frequent hand washing, as well as adhering to all other health, safety and social distancing measures required by governmental authorities. At December 31, 2020, approximately 92% of the workforce in Mexico was working on site or at home under strict safety measures; the remaining 8% of the workforce was not working, including all individuals at high risk due to age and/or preexisting medical conditions. At our Peruvian operations, approximately 63% of the workforce was working onsite or at home under strict safety measures, while the remaining 37% was not working, including all individuals at high risk due to age and/or preexisting medical conditions. Through December 31, 2020, SCC incurred approximately $27.6 million in COVID-19 related production costs that include protective equipment and labor costs. These costs have been expensed to cost of sales in the Company´s consolidated statement of earnings.

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KEY MATTERS

Below, we discuss several matters that we believe are important to understand our results of operations and financial condition. These matters include (i) earnings, (ii) production, (iii) “operating cash costs” as a measure of our performance, (iv) metal prices, (v) business segments, (vi) the effect of inflation and other local currency issues and (vii) our capital investment and exploration program.

Earnings: The table below highlights key financial and operational data of our Company for the three years ended December 31, 2020 (in millions, except copper price and per share amounts):

							Variance
	2020		2019		2018		2020 - 2019		2019 - 2018
Copper price LME		2.80		2.72		2.96		0.08		(0.24)
Pounds of copper sold		2,305.9		2,173.8		1,952.9		132.1		220.9
Net sales	$	7,984.9	$	7,285.6	$	7,096.7	$	699.3	$	188.9
Operating income	$	3,120.7	$	2,753.0	$	2,881.2	$	367.7	$	(128.2)
Income before income taxes	$	2,745.8	$	2,426.5	$	2,589.4	$	319.3	$	(162.9)
Net income attributable to SCC	$	1,570.4	$	1,485.8	$	1,543.0	$	84.6	$	(57.2)
Earnings per share	$	2.03	$	1.92	$	2.00	$	0.11	$	(0.08)
Dividends per share	$	1.50	$	1.60	$	1.40	$	(0.10)	$	0.20

Net sales in 2020 of $8.0 billion were the highest in our history and exceeded those recorded in 2019 by $699.3 million. This increase was mainly the result of higher copper (+6.1%), molybdenum (+12.7%) and silver (+8.8%) sales volumes, as well as higher copper (+2.9%) and silver (+27.6%) prices; this effect was partially offset by lower molybdenum (-24.0%) prices. Net sales in 2019 of $7.3 billion were higher than in 2018 by $188.9 million. This increase was mainly the result of higher copper (+11.3%), molybdenum (+21.7%) and silver (+5.7%) sales volumes and was partially offset by lower copper (−8.1%) and molybdenum (−5.0%) prices.

The two largest components of operating costs and expenses are cost of sales and depreciation, amortization and depletion, both of which increased in each of the years in the periods shown above. In 2020, cost of sales increased by $323.4 million and depreciation, amortization and depletion increased by $11.2 million. The increase in cost of sales in 2020 was mainly due to an increase in the cost of metals purchased from third parties and a decrease in the capitalization of leachable material. This increase was partially offset by a reduction in the cost of diesel and fuel. In 2019, cost of sales increased by $197.4 million and depreciation, amortization and depletion increased by $90.1 million. The increase in cost of sales in 2019 was mainly due to higher repairing materials and operating contractors’ costs, as well as a decrease in capitalized leachable material. This increase was partially offset by a decrease in the cost of metals purchased from third parties.

Net income attributable to SCC in 2020 was 5.7% higher than reported in 2019; this was mainly due to higher sales volumes and to higher copper and silver prices. Net income attributable to SCC in 2019 was 3.6% lower than in 2018; this was primarily driven by a decrease in prices for copper and molybdenum, despite an increase in sales volumes.

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Production: The table below contains mine production data of our Company for the three years ended December 31, 2020:

				Variance
				2020 - 2019			2019 - 2018
	2020	2019	2018	Volume	%		Volume	%
Copper (in million pounds)	2,207.6	2,191.0	1,948.2	16.6	0.8	%	242.8	12.5	%
Molybdenum (in million pounds)	66.7	59.3	48.5	7.4	12.5	%	10.8	22.3	%
Zinc (in million pounds)	152.0	163.0	156.0	(11.0)	(6.8)	%	7.0	4.5	%
Silver (in million ounces)	21.5	20.3	17.3	1.2	6.2	%	3.0	17.3	%

The table below contains copper production data from each of our mines for the three years ended December 31, 2020:

				Variance
				2020 - 2019			2019 - 2018
Copper (in million pounds):	2020	2019	2018	Volume	%		Volume	%
Toquepala	562.4	568.8	375.4	(6.4)	(1.1)	%	193.4	51.5	%
Cuajone	371.8	344.8	354.0	27.0	7.8	%	(9.2)	(2.6)	%
La Caridad	298.8	293.4	292.1	5.4	1.8	%	1.3	0.4	%
Buenavista	951.9	965.8	913.0	(13.9)	(1.4)	%	52.8	5.8	%
IMMSA	22.7	18.2	13.7	4.5	24.6	%	4.5	32.8	%
Total mined copper	2,207.6	2,191.0	1,948.2	16.6	0.8	%	242.8	12.5	%

2020 compared to 2019:

Copper mine production in 2020 increased 0.8% to 2,207.6 million pounds, up from 2,191.0 million pounds in 2019. This increase was due to:

● Higher production at the Cuajone mine (+7.8%), which was driven by an increase in ore grades and recoveries.

● Higher production at the La Caridad mine (+1.8%).

● Higher production at the IMMSA operations (+24.6%), which was attributable to an increase in ore grades.

Molybdenum production increased 12.5% in 2020 compared to the level in 2019 due to an increase in production at our Toquepala (+37.7%), Cuajone (+28.6%) and La Caridad (+3.2%) operations; this was partially offset by a decrease in production at our Buenavista (-10.6%) mine.

Zinc production decreased 6.8% in 2020, which was driven by a decrease in ore grades and in production at our Santa Eulalia (-96.0%) and Los Charcas (-5.0%) operations; this was partially offset by an increase in production at our San Martin (+151.0%) mine, which restored production to full capacity at the end of the third quarter of 2019.

Mined silver production increased 6.2% in 2020 compared to the level recorded in 2019; this was mainly due to an increase in production at our Cuajone (+8.8%), La Caridad (+16.4%) and IMMSA (+15.0%) operations, which was partially offset by a decrease in production at the Toquepala (-2.4%) and Buenavista (-3.6%) mines.

2019 compared to 2018:

Copper mine production in 2019 increased 12.5% to 2,191.0 million pounds from 1,948.2 million pounds in 2018. This increase was due to:

● Higher production at the Toquepala mine (+51.5%), as a result of additional copper production of 93,108 tons from the successful ramping up of the new concentrator.

● Higher production at the Buenavista mine (+5.8%) due to operating improvements at our new Buenavista plants, the SX/EW (+12.2%) and concentrator (+4.0%).

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● Higher production at the IMMSA operations (+32.9%), as result of the restoration of the San Martin mine operations.

Molybdenum production increased 22.3% in 2019 compared to 2018 due to higher production at all of our mines, principally at the Toquepala mine (+75%) due to the successful ramping up of the new molybdenum plant that started production in April 2019.

Zinc production increased 4.4% in 2019, as a result of higher production at our Santa Barbara mine due to higher grades and recoveries, as well as the restored production of 5,837 tons from our San Martin mine.

Mined silver production increased 17.1% in 2019 compared to 2018, mainly due to higher production at our Toquepala (+60.5%), IMMSA (+22.9%) and Buenavista (+11.5%) operations, partially offset by lower production at the La Caridad (-6.6%) and Cuajone (-3.2%) mines.

Operating Cash Costs: An overall benchmark used by us and a common industry metric to measure performance is operating cash costs per pound of copper produced. Operating cash cost is a non-GAAP measure that does not have a standardized meaning and may not be comparable to similarly titled measures provided by other companies. This non-GAAP information should not be considered in isolation or as substitute for measures of performance determined in accordance with GAAP. A reconciliation of our operating cash cost per pound of copper produced to the cost of sales (exclusive of depreciation, amortization and depletion) as presented in the consolidated statement of earnings is presented under the subheading, “Non-GAAP Information Reconciliation” on page 96. We disclose operating cash cost per pound of copper produced, both before and net of by-product revenues.

We define operating cash cost per pound of copper produced before by-product revenues as cost of sales (exclusive of depreciation, amortization and depletion), plus selling, general and administrative charges, treatment and refining charges net of sales premiums; less the cost of purchased concentrates, workers’ participation and other miscellaneous charges, including royalty charges, and the change in inventory levels; divided by total pounds of copper produced by our own mines.

In our calculation of operating cash cost per pound of copper produced, we exclude depreciation, amortization and depletion, which are considered non-cash expenses. Exploration is considered a discretionary expenditure and is also excluded. Workers’ participation provisions are determined on the basis of pre-tax earnings and are also excluded. Additional exclusions from operating cash costs are items of a non-recurring nature and the mining royalty charge as it is based on various calculations of taxable income, depending on which jurisdiction, Peru or Mexico, is imposing the charge. We believe these adjustments will allow our management and stakeholders to see a presentation of our controllable cash cost, which we believe is one of the lowest of all copper-producing companies of similar size.

We define operating cash cost per pound of copper produced net of by-product revenues as operating cash cost per pound of copper produced, as defined in the previous paragraph, less by-product revenues and net revenue (loss) on sale of metal purchased from third parties.

In our calculation of operating cash cost per pound of copper produced, net of by-product revenues, we credit against our costs the revenues from the sale of all our by-products, including, molybdenum, zinc, silver, gold, etc. and the net revenue (loss) on sale of metals purchased from third parties. We disclose this measure including the by-product revenues in this way because we consider our principal business to be the production and sale of copper. As part of our copper production process, much of our by-products are recovered. These by-products, as well as the processing of copper purchased from third parties, are a supplemental part of our production process and their sales value contribute to covering part of our incurred fixed costs. We believe that our Company is viewed by the investment community as a copper company, and is valued, in large part, by the investment community’s view of the copper market and our ability to produce copper at a reasonable cost.

We believe that both of these measures are useful tools for our management and our stakeholders. Our cash costs before by-product revenues allow us to monitor our cost structure and address areas of concern within operating management. The measure operating cash cost per pound of copper produced net of by-product revenues is a common measure used in

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the copper industry and is a useful management tool that allows us to track our performance and better allocate our resources. This measure is also used in our investment project evaluation process to determine a project’s potential contribution to our operations, its competitiveness and its relative strength in different price scenarios. The expected contribution of by-products is generally a significant factor used by the copper industry to determine whether to move forward or not in the development of a new mining project. As the price of our by-product commodities can have significant fluctuations from period to period, the value of its contribution to our costs can be volatile.

Our operating cash cost per pound of copper produced, as defined above, is presented in the table below for the three years ended December 31, 2020:

Operating cash cost per pound of copper produced(1)

(In millions, except cost per pound and percentages)

							2020 - 2019				2019 - 2018
	2020		2019		2018		Value		%		Value		%
Total operating cash cost before by‑product revenues	$	2,923.7	$	3,230.9	$	2,904.4	$	(307.2)	(9.5)	%	$	326.5	11.2	%
Total by‑product revenues	$	(1,455.9)	$	(1,359.2)	$	(1,267.7)	$	(96.7)	7.1	%		(91.5)	7.2	%
Total operating cash cost net of by‑product revenues	$	1,467.8	$	1,871.7	$	1,636.7	$	(403.9)	(21.6)	%	$	235.0	14.4	%
Total pounds of copper produced(2)		2,136.1		2,133.3		1,886.8		2.8	0.1	%		246.5	13.1	%
Operating cash cost per pound before by‑product revenues	$	1.37	$	1.52	$	1.54	$	(0.15)	(9.9)	%	$	(0.02)	(1.3)	%
By‑products per pound revenues	$	(0.68)	$	(0.64)	$	(0.67)	$	(0.04)	6.3	%	$	0.03	(4.5)	%
Operating cash cost per pound net of by‑product revenues	$	0.69	$	0.88	$	0.87	$	(0.19)	(21.7)	%	$	0.01	1.1	%

(1) These are non-GAAP measures, see page 96 for reconciliation to GAAP measure.

(2) Net of metallurgical losses.

2020 compared to 2019:

As seen in the table above, our per pound cash cost before by-product revenues in 2020 was 9.9% lower than that recorded in 2019. This reduction is mainly attributable to a temporary decrease in production costs, as some operating, stripping and maintenance costs were reduced or postponed due to the COVID-19 pandemic. Our cash cost per pound net of by-product revenues for 2020 was 21.7% below that seen for the same period of 2019 and was also attributable to the temporary decrease in production costs outlined above.

2019 compared to 2018:

As seen in the table above, our per pound cash cost before by-product revenues in 2019 was 1.3% lower when compared with 2018. This decrease was the result of the unit cost effect of 13.1% higher production. Meanwhile, our cash cost per pound when calculated net of by-product revenues for 2019 was 1.1% higher than in the same period of 2018 due to the higher production noted, as well as lower by-product revenues due to the additional copper volume effect.

Metal Prices: The profitability of our operations is dependent on, and our financial performance is significantly affected by, the international market prices for the products we produce, especially for copper, molybdenum, zinc and silver.

We are subject to market risks arising from the volatility of copper and other metals prices. Metal prices historically have been subject to wide fluctuations and are affected by numerous factors beyond our control. These factors, which affect each commodity to varying degrees, include international economic and political conditions, levels of supply and demand, the availability and cost of substitutes, inventory levels maintained by producers and others and, to a lesser degree, inventory carrying costs and currency exchange rates. In addition, the market prices of certain metals have on occasion been subject to rapid short-term changes due to economic concerns and financial investments.

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For 2021, assuming that expected metal production and sales are achieved; 2020 tax rates are unchanged and giving no effects relative to potential hedging programs, metal price sensitivity factors indicate the following change in estimated annual net income attributable to SCC resulting from metal price changes:

	Copper		Molybdenum		Zinc		Silver
Change in metal prices (per pound except silver—per ounce)	$	0.10	$	1.00	$	0.10	$	1.00
Change in net earnings (in millions)	$	122.2	$	35.8	$	14.3	$	13.5

Business Segments: We view our Company as having three reportable segments and manage it on the basis of these segments. These segments are (1) our Peruvian operations, (2) our Mexican open-pit operations and (3) our Mexican underground operations, known as our IMMSA unit. Our Peruvian operations include the Toquepala and Cuajone mine complexes and the smelting and refining plants, industrial railroad and port facilities that service both mines. Our Mexican open-pit operations include La Caridad and Buenavista mine complexes, the smelting and refining plants and support facilities, which service both mines. Our IMMSA unit includes five underground mines and several industrial processing facilities.

Segment information is included in our review of “Results of Operations” in this item and also in Note 18 “Segment and Related Information” of the consolidated financial statements.

Inflation and Exchange Rate Effect of the Peruvian sol and the Mexican peso: Our functional currency is the U.S. dollar and our revenues are primarily denominated in U.S. dollars. Significant portions of our operating costs are denominated in Peruvian sol and Mexican pesos. Accordingly, when inflation and currency devaluation/appreciation of the Peruvian and Mexican currency occur, our operating results can be affected. In recent years, we believe these changes have had no material effect on our results and financial position. Please see Item 7A “Quantitative and Qualitative Disclosures about Market Risk” for more detailed information.

Capital Investment Program: We made capital investments of $592.2 million in 2020, $707.5 million in 2019 and $1,121.4 million in 2018. In general, the capital investments and projects described below are intended to increase production, decrease costs or address social and environmental commitments.

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The table below contains information on our capital investments for the three years ended December 31, 2020 (in millions):

	2020		2019		2018
Peruvian projects:
Toquepala expansion project	$	5.1	$	41.1	$	392.4
Quebrada Honda dam expansion		30.9		—		—
Heavy mineral management optimizing project—Cuajone		—		—		17.0
Toquepala mine truck acquisition		9.7		—		—
HPGR system—Toquepala		—		7.6		7.8
Tailings disposal—Quebrada Honda dam		0.4		1.0		23.7
Ilo sulfuric acid plant N°1 modification		2.0		5.1		15.3
Pumping system neutralization plant - Toquepala		5.1		8.0		—
Other projects		46.8		37.8		25.1
Sub‑total projects		100.0		100.6		481.3
Maintenance and replacement		109.4		216.3		201.4
Net change in capital expenditures incurred but not yet paid		(14.4)		33.2		91.3
Total Peruvian expenditures		195.0		350.1		774.0
Mexican projects:
New Buenavista concentrator		68.3		1.0		5.8
Pilares Mine		33.4		—		—
Buenavista projects infrastructure		—		1.1		2.3
Solutions system improvements of Tinajas		10.0		6.0		1.3
Quebalix IV		0.1		0.7		2.0
New tailing disposal deposit at Buenavista mine		27.0		35.8		56.7
Over elevation of tailings deposit N° 7 at La Caridad mine		11.0		25.4		18
Sonora River water restitution system in Moritas Basin		—		1.8		6
San Martin mine restoration		21.1		48.9		13.5
Other projects		109.5		85.7		63.5
Sub‑total projects		280.4		206.4		169.4
Maintenance and replacement		132.5		148.6		169.3
Net change in capital expenditures incurred but not yet paid		(15.7)		2.4		8.7
Total Mexican expenditures		397.2		357.4		347.4
Total capital investments	$	592.2	$	707.5	$	1,121.4

In 2021, we plan to invest $1,431.3 million in capital projects. In addition to our ongoing capital maintenance and replacement spending, our principal capital programs include the following:

Projects in Mexico:

Buenavista Zinc - Sonora: This project is located within the Buenavista facility and includes the development of a new concentrator to produce approximately 80,000 tons of zinc and 20,000 tons of copper per year. We have completed the basic engineering study and the detailed engineering study has reached 81% completion. In order to continue with the project, stronger preventive measures to combat COVID-19 have been put in place. Purchase orders have been placed for major equipment, some of which is currently being manufactured. The project has all the necessary permits. The project´s budget is $413 million, and we expect to initiate operations in 2023. When completed, we anticipate that this new facility will double the Company’s zinc production capacity and will provide 490 direct jobs and 1,470 indirect jobs.

Pilares - Sonora: This project, located six kilometers from La Caridad, will be developed as an open-pit mine operation with an annual production capacity of 35,000 tons of copper in concentrate. The ore will be transported from the pit to the primary crushers of the La Caridad copper concentrator through a new 25-meter wide off-road facility for mining trucks, which is under construction, and will significantly improve the overall mineral ore grade (combining the 0.78%

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expected from Pilares with 0.34% from La Caridad). The budget for Pilares is $159 million and we expect the project to begin production in the first quarter of 2022.

El Pilar - Sonora: This is a low-capital intensity copper development project strategically located in Sonora, Mexico, approximately 45 kilometers from our Buenavista mine. Its copper oxide mineralization contains estimated proven and probable reserves of 281 million tons of ore with an average copper grade of 0.301%. El Pilar will operate as a conventional open-pit mine with an annual production capacity of 36,000 tons of copper cathodes. This operation will use highly cost efficient and environmentally friendly SX-EW technology. We estimate a development investment of approximately $310 million. Construction at the pilot plant and experimental pads has ended and tests are being performed. The results from experimental pads on leaching process have confirmed adequate levels of copper recovery. We expect this project to start production in 2023 with an expected mine life of 13 years.

The San Martin mine recovery program. After eleven years of illegal stoppage, we resumed control of the San Martin mine in August 2018. The San Martin facilities deteriorated during this period but we made a major renovation and restarted operations during the second quarter of 2019. In 2020, we produced 14,361 tons of zinc, 2.8 million ounces of silver, 3,601 tons of copper, and 1,425 tons of lead. The budget for the restoration program is $97.7 million. As of December 31, 2020 the program reported a total expense of $86.4 million.

Projects in Peru:

Quebrada Honda dam expansion – Tacna: This project aims to enlarge the main and lateral dams in Quebrada Honda and includes the relocation of some facilities due to dam growth and implementation of other facilities for water recovery, among other factors. As of December 31, 2020, the engineering study is complete and we have initiated the procurement process for the necessary materials and equipment. This project has a total budget of $140.0 million, of which we have invested $32 million as of December 31, 2020. Progress on the Project is 41% according to the plan.

Tia Maria - Arequipa: On July 8, 2019, we were granted the construction permit for this 120,000 ton annual SX-EW copper greenfield project with a total capital budget of $1,400 million. The Government awarded the permit after completing an exhaustive review process, complying with all established regulatory requirements and addressing all observations raised. The challenges surrounding the construction permit were overcome when on October 30, 2019, the Mining Council of the Peruvian Ministry of Energy and Mines ratified the construction permit for the Tia Maria project.

The Company has been consistently working to promote the welfare of the Islay province population. As part of these efforts, we have implemented successful social programs in education, healthcare and productive development to improve the quality-of-life in the region. We also have promoted agricultural and livestock activities in the Tambo Valley and supported growth in manufacturing, fishing and tourism in Islay.

We consider that the initiation of construction activities at Tia Maria will generate significant economic opportunities for the Islay province and the Arequipa region. During the construction and operation phase, we will make it a priority to hire local labor to fill the 9,000 jobs (3,600 direct and 5,400 indirect) that we expect to generate during Tia Maria’s construction phase. When operating, we expect Tia Maria to directly employ 600 workers and indirectly provide jobs for another 4,200. Additionally, from day one of our operations, we will generate significant contributions to revenues in the Arequipa region via royalties and taxes.

This greenfield project, located in Arequipa, Peru, will use state of the art SX-EW technology with the highest international environmental standards. SX-EW facilities are the most environmentally friendly in the industry due to their technical process with no emissions released into the atmosphere. 

Potential projects:

We have a number of other projects that we may develop in the future. We continuously evaluate new projects on the basis of our long-term corporate objectives, strategic and operating fit, expected return on investment, required investment, estimated production, estimated cash-flow profile, social and environmental considerations, among other

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factors. All capital spending plans will continue to be reviewed and adjusted to respond to changes in the economy, market conditions or the COVID-19 pandemic.

El Arco - Baja California: This is a world-class copper deposit located in the central part of the Baja California peninsula, with ore reserves of 2.4 billion tons with an ore grade of 0.422%, 0.3 billion tons of leach material with an ore grade of 0.288% and 0.11 grams of gold per ton. This project envisions an open-pit mine with a combined concentrator and SX-EW operations, with an estimated production capacity of 190,000 tons of copper and 105,000 ounces of gold annually. The project has an estimated capital budget of $2.9 billion. The Company has started the baseline study and is reviewing the basic engineering analysis to request the environmental impact permit. We are currently in the final stage of the land acquisition process for the project.

Los Chancas—Apurimac: This greenfield project, located in Apurimac, Peru, is a copper and molybdenum porphyry deposit. Current estimates indicate the presence of 545 million tons of mineralized material with a copper content of 0.59%, molybdenum content of 0.04% and 0.039 grams of gold per ton, as well as 181 million tons of mineralized leachable material with a total copper content of 0.357%. Los Chancas project envisions an open-pit mine with a combined operation of concentrator and SX-EW processes to produce 130,000 tons of copper and 7,500 tons of molybdenum annually. The estimated capital investment is $2,600 million and the project is expected to be in operation in 2027. In 2019, we continued to engage in social and environmental improvements for the local communities. In 2020, we continued to work on these activities and plan to conclude the environmental impact assessment for the project in 2021.

Michiquillay Project—Cajamarca: On June 12, 2018, Southern Copper signed a contract and made an initial payment of $12.5 million for the acquisition of the Michiquillay project in Cajamarca, Peru. The Company has created a multidisciplinary management team to plan the development of this project. As part of this plan, the Company has established contact with the local and regional authorities and communities to promote programs to sustainably develop the area. In 2020, we continued to develop social and environmental programs for the local communities and are concluding a semi-detailed environmental impact assessment. This will allow us to begin a 50,000 meter diamond drilling program in 2021 to verify and update the project´s estimated mineralized materials.

Michiquillay is a world class mining project with estimated mineralized material of 1,150 million tons with an estimated copper grade of 0.63%. When developed, we expect Michiquillay to produce 225,000 tons of copper per year (along with by-products of molybdenum, gold and silver) for an initial mine life of more than 25 years and at a competitive cash-cost. We estimate an investment of approximately $2.5 billion will be required and expect production start-up by 2028. We believe that Michiquillay will become one of Peru´s largest copper mines. The project will create significant business opportunities in the Cajamarca region, generate new jobs for the local communities and contribute with taxes and royalties to the local, regional and national governments.

The above information is based on estimates only. We cannot make any assurances that we will undertake any of these projects or that the information noted is accurate.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

Our significant accounting policies are discussed in Note 2 “Summary of Significant Accounting Policies” of the Notes to Consolidated Financial Statements, included in Item 8 “Financial Statements and Supplementary Data” of this Annual Report.

Our discussion and analysis of financial condition and results of operations, as well as quantitative and qualitative disclosures about market risks, are based upon our consolidated financial statements, which have been prepared in accordance with U.S. GAAP. Preparation of these consolidated financial statements requires our management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. We make our best estimate of the ultimate outcome for these items based on historical trends and other information available when the financial statements are prepared. Changes in estimates are recognized in accordance with the accounting rules for the estimate, which is typically in the period when new information becomes available to

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management. Areas where the nature of the estimate makes it reasonably possible that actual results could materially differ from amounts estimated include: ore reserves, revenue recognition, ore stockpiles on leach pads and related amortization, estimated impairment of assets, asset retirement obligations, determination of discount rates related to the operating lease liabilities, valuation allowances for deferred tax assets and unrecognized tax benefits. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances. Actual results may differ from these estimates under different assumptions or conditions.

Ore Reserves: For internal ore reserve estimation, we use metal price assumptions of $3.00 per pound for copper and $9.00 per pound for molybdenum. These prices are intended to conservatively approximate average prices over the long term and are based on internal estimates for the curves of long-term metal prices.

However, pursuant to SEC guidance, the reserve information in this report is calculated using average metal prices for the most recent three-year period, except as otherwise stated. We refer to these three-year average metals prices as “current average prices.” Our current average prices for copper are calculated using prices quoted by COMEX, and our current average prices for molybdenum are calculated using prices published in Platt’s Metals Week. Unless otherwise stated, reserve estimates in this report use the following three years average prices for copper and molybdenum as of December 31, 2020:

							Average
	2020		2019		2018			2020 - 2018
Copper ($per pound)	$	2.80	$	2.72	$	2.93	$	2.82
Molybdenum ($per pound)	$	8.69	$	11.35	$	11.94	$	10.66

Certain financial information is based on reserve estimates calculated on the basis of current average prices. These include amortization of intangible assets and mine development. Variations in ore reserve calculations from changes in metal price assumptions generally do not create material changes in our financial results. However, significant decreases in metal prices could adversely affect our earnings by causing, among other things, asset impairment charges, please see “Assets impairment” below. A 20% increase or decrease in three-year average copper prices (current prices) for mineral reserves estimation, which is a reasonable possibility, would not materially affect our statement of earnings as the amount of reserves would not change significantly. Please see Item 2 “Properties—Ore reserves.”

Ore stockpiles on leach pads: The leaching process is an integral part of the mining operations carried out at our open-pit mines. We capitalize the production cost of leachable material at our Toquepala, La Caridad and Buenavista mines recognizing it as inventory. The estimates of recoverable mineral content contained in the leaching dumps are supported by engineering studies. As the production cycle of the leaching process is significantly longer than the conventional process of concentrating, smelting and electrolytic refining, we include current leach inventory (as part of work-in-process inventories) and long-term leach inventory on our balance sheet. Amortization of leachable material is recorded by the units of production method.

On January 1, 2020, the Company aligned its capitalization method for its Peruvian and Mexican operations to capitalize based on the allocation of copper content recoverable between ore and leach material. In addition, inventory consumption is now valued at the average unit cost, instead of the declining percentages of recovery method used previously. As a result of these changes, during 2020 the value of capitalized material decreased by $196.4 million and consumption decreased by $29.3 million when compared to the previous capitalization method.

Management has evaluated ASC 250-10 and considered appropriate guidance to conclude that the aforementioned classifies as a change in accounting estimate, and therefore should affect accounting books prospectively. Management believes that this new method will result in a more accurate valuation of this material.

Asset Retirement Obligation: Our mining and exploration activities are subject to various laws and regulations governing the protection of the environment. Accounting for reclamation and remediation obligations requires management to make estimates unique to each mining operation of the future costs we will incur to complete the reclamation and remediation work required to comply with existing laws and regulations. These estimates are based in part on our inflation and credit rate assumptions. Actual costs incurred in future periods could differ from amounts estimated. Additionally, future changes to environmental laws and regulations could increase the extent of reclamation and remediation work required to be performed by us. Any such increases in future costs could materially impact the

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amounts charged to operations for reclamation and remediation. In 2020, the Company made a change in the estimate for the asset retirement obligation for its Mexican operations, mainly due to a detailed review of the closing activities required for each facility. The effect of this change was an increase in the asset retirement obligation of $269.3 million, which was recorded in December 2020.

Asset retirement obligations are further discussed in Note 10 “Asset Retirement Obligation” to the consolidated financial statements included herein.

Revenue Recognition: For certain of our sales of copper and molybdenum products, customer contracts allow for pricing based on a month subsequent to shipping, in most cases within the following three months and in a few cases, in a period that can exceed three months. In such cases, revenue is recorded at a provisional price at the time of shipment. The provisionally priced copper sales are adjusted to reflect forward LME or COMEX copper prices at the end of each month until a final adjustment is made to the price of the shipments upon settlement with customers pursuant to the terms of the contract. In the case of molybdenum sales, for which there are no published forward prices, the provisionally priced sales are adjusted to reflect the market prices at the end of each month until a final adjustment is made to the price of the shipments upon settlement with customers pursuant to the terms of the contract. (See details in “Provisionally Priced Sales” under this Item 7).

Income Taxes: In preparing our consolidated financial statements, we recognize income taxes in each of the jurisdictions in which we operate. For each jurisdiction, we calculate the actual amount currently payable or receivable, as well as deferred tax assets and liabilities attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred income tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which these temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in rate is recognized through the income tax provision in the period that the change is enacted.

A valuation allowance is provided for those deferred tax assets for which it is more likely than not that the related benefits will not be realized. In determining the amount of the valuation allowance, we consider estimated future taxable income, as well as feasible tax planning strategies in each jurisdiction. If we determine that we will not realize all or a portion of our deferred tax assets, we will increase our valuation allowance with a charge to income tax expense. Conversely, if we determine that we will ultimately be able to realize all or a portion of the related benefits for which a valuation allowance has been provided, all or a portion of the related valuation allowance will be reduced with a credit to income tax expense.

Our Company’s operations involve dealing with uncertainties and judgments in the application of complex tax regulations in multiple jurisdictions. The final taxes paid are dependent upon many factors, including negotiations with taxing authorities in various jurisdictions and resolution of disputes arising from federal, state, and international tax audits. We recognize potential liabilities and record tax liabilities for anticipated tax audit issues in the U.S. and other tax jurisdictions based on our estimate of whether, and the extent to which, additional taxes will be due. We follow the guidance of ASC 740 “Income Taxes” to record these liabilities. (See Note 7 “Income Taxes” of the consolidated financial statements for additional information). We adjust these reserves in light of changing facts and circumstances; however, due to the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different from our current estimate of the tax liabilities. If our estimate of tax liabilities proves to be less than the ultimate assessment, an additional charge to expense would result. If payment of these amounts ultimately proves to be less than the recorded amounts, the reversal of the liabilities would result in tax benefits being recognized in the period when we determine the liabilities are no longer necessary. We recognize interest and penalties, if any, related to unrecognized tax benefits in income tax expense.

On December 22, 2017, the Tax Cuts and Jobs Act (“TCJA”) significantly changed U.S. tax law by, among other things, lowering corporate income tax rates from 35% to a flat 21% effective January 1, 2018, implementing a territorial tax system; and imposing a repatriation tax on deemed repatriated earnings of foreign subsidiaries. To address circumstances that could arise because of the late passage of TCJA in 2017, the SEC issued Staff Accounting Bulletin No. 118 to address the application of U.S. GAAP in situations when a registrant lacked sufficient information prepared or analyzed

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in reasonable detail, to complete accounting under ASC 740 “Accounting For Income Taxes” during the following year (2018).

Asset Impairments: We evaluate our long-term assets when events or changes in economic circumstances indicate that the carrying amount of such assets may not be recoverable. Our evaluations are based on business plans that are prepared using a time horizon that is reflective of our expectations of metal prices over our business cycle. We are currently using an average copper price of $2.20 per pound and an average molybdenum price of $5.00 per pound, which reflect what we believe, for impairment test purposes, is the lower range of the current price environment. The results of our impairment sensitivity analysis, which included a stress test using a copper price assumption of $2.00 per pound and a molybdenum price assumption of $4.00 per pound, showed projected discounted cash flows in excess of the carrying amounts of long-lived assets by margins ranging from 1.3 to 4.3 times such carrying amount.

In recent years, our assumptions for long-term average prices resulted in stricter evaluations for impairment analysis than using the three year average prices for copper and molybdenum prices. Should this situation change in the future with three-year average prices falling below the long-term price assumption, we would assess the need to use the three-year average prices in our evaluations. We use an estimate of the future undiscounted net cash flows of the related asset or asset group over the remaining life to measure whether the assets are recoverable and measure any impairment compared to fair value.

Leases: In 2019, the Company adopted the new leases standard and it resulted in the recognition of right-of-use assets and lease obligations on the Company´s balance sheet. After the analysis of this standard, the Company concluded that all of its existing lease contracts are operating lease contracts. Right-of-use assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent an obligation by the Company to make lease payments that arise from the lease. Lease right-of-use assets and liabilities are recognized at the inception date based on the present value of lease payments over the lease term. As the Company’s lease contracts do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the inception date to determine the present value of lease payments.

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RESULTS OF OPERATIONS

The following table highlights key financial results for each of the years in the three-year period ended December 31, 2020 (in millions):

							Variance
Statement of Earnings Data	2020		2019		2018		2020 - 2019		2019 - 2018
Net sales	$	7,984.9	$	7,285.6	$	7,096.7	$	699.3	$	188.9
Operating costs and expenses		(4,864.2)		(4,532.6)		(4,215.5)		(331.6)		(317.1)
Operating income		3,120.7		2,753.0		2,881.2		367.7		(128.2)
Non‑operating income (expense)		(374.9)		(326.5)		(291.8)		(48.4)		(34.7)
Income before income taxes		2,745.8		2,426.5		2,589.4		319.3		(162.9)
Income taxes		(1,237.9)		(966.3)		(1,105.0)		(271.6)		138.7
Deferred income taxes		63.5		21.0		51.5		42.5		(30.5)
Equity earnings of affiliate		6.4		10.7		12.3		(4.3)		(1.6)
Net income attributable to non‑controlling interest		(7.4)		(6.1)		(5.2)		(1.3)		(0.9)
Net income attributable to SCC	$	1,570.4	$	1,485.8	$	1,543.0	$	84.6	$	(57.2)

NET SALES

2020-2019: Net sales in 2020 were $7,984.9 million, compared to $7,285.6 million in 2019, which represented an increase of $699.3 million. This 9.6% increase was mainly the result of higher sales volumes of copper (+6.1%), silver (+8.8%), molybdenum (+12.7%) and zinc (+1.0%) as well as higher copper (+2.9%) and silver (+27.7%) prices. This effect was slightly offset by lower molybdenum (−24.0%) and zinc (-11.2%) prices.

2019-2018: Net sales in 2019 were $7,285.6 million, compared to $7,096.7 million in 2018, an increase of $188.9 million. This 2.7% increase was mainly the result of higher copper (+11.3%), molybdenum (+21.7%) and silver (+5.7%) sales volumes, partially offset by copper (−8.1%) and molybdenum (−5.0%) prices.

The table below outlines the average published market metals prices for our metals for each of the three years in the three-year period ended December 31, 2020:

							% Variance
	2020		2019		2018		2020 - 2019		2019 - 2018
Copper price ($per pound—LME)	$	2.80	$	2.72	$	2.96	2.9	%	(8.1)	%
Copper price ($per pound—COMEX)	$	2.80	$	2.72	$	2.93	2.9	%	(7.2)	%
Molybdenum price ($per pound)(1)	$	8.57	$	11.27	$	11.86	(24.0)	%	(5.0)	%
Zinc price ($per pound—LME)	$	1.03	$	1.16	$	1.33	(11.2)	%	(12.8)	%
Silver price ($per ounce—COMEX)	$	20.62	$	16.16	$	15.65	27.6	%	3.3	%

(1) Platt’s Metals Week Dealer Oxide.

The table below provides our metal sales as a percentage of our total net sales:

	Year Ended
	December 31,
Sales as a percentage of total net sales	2020		2019		2018
Copper	81.6	%	80.2	%	80.4	%
Molybdenum	6.4	%	7.5	%	7.2	%
Silver	5.6	%	4.5	%	4.2	%
Zinc	3.1	%	3.8	%	4.6	%
Other by‑products	3.3	%	4.0	%	3.6	%
Total	100.0	%	100.0	%	100.0	%

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The table below provides our copper sales by type of product (in million pounds). The difference in value between products is the level of processing. At the market price, concentrates take a discount since they require smelting and refining processes, while refined and rod copper receive premiums due to their purity and presentation.

				Variance
Copper Sales (million pounds)	2020	2019	2018	2020 - 2019	2019 - 2018
Refined (including SX‑EW)	1,069.6	1,065.2	1,152.2	4.4	(87.0)
Rod	389.0	365.5	335.7	23.5	29.8
Concentrates and other	847.3	743.1	465.0	104.2	278.1
Total	2,305.9	2,173.8	1,952.9	132.1	220.9

The table below provides our copper sales volume by type of product as a percentage of our total copper sales volume:

	Year ended December 31,
Copper Sales by product type	2020		2019		2018
Refined (including SX‑EW)	46.4	%	49.0	%	59.0	%
Rod	16.9	%	16.8	%	17.2	%
Concentrates and other	36.7	%	34.2	%	23.8	%
Total	100.0	%	100.0	%	100.0	%

OPERATING COSTS AND EXPENSES

The table below summarizes the production cost structure by major components for the three years ended 2020 as a percentage of total production cost:

	Year ended December 31,
	2020		2019		2018
Power	16.8	%	14.7	%	14.8	%
Labor	13.5	%	13.9	%	13.9	%
Fuel	11.2	%	13.2	%	14.6	%
Maintenance	22.6	%	21.0	%	19.5	%
Operating material	17.4	%	17.7	%	18.7	%
Other	18.5	%	19.5	%	18.5	%
Total	100.0	%	100.0	%	100.0	%

2020-2019: Operating costs and expenses in 2020 increased $331.6 million, compared to 2019, primarily due to:

Operating cost and expenses for 2019		$	4,532.6
Plus:
•	Increase in volume and cost of metals purchased from third parties.		177.5
•	Decrease in capitalized leachable material.		218.2
•	COVID-19 related costs.		27.6
•	Increase in depreciation, amortization and depletion expense.		11.2
•	Increase in exploration expense.		2.6
Less:
•	Decrease in other cost of sales (exclusive of depreciation, amortization and depletion), mainly attributable to lower fuel costs.		(99.9)
•	Decrease in selling, general and administrative expenses.		(5.6)
Operating cost and expenses for 2020		$	4,864.2

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2019-2018: Operating costs and expenses in 2019 increased $317.1 million, compared to 2018, primarily due to:

Operating cost and expenses for 2018		$	4,215.5
Plus:
•	Decrease in capitalized leachable material.		97.9
•	Increase in other cost of sales (exclusive of depreciation, amortization and depletion) mainly due to higher repairing materials and operating contractors costs, partially offset by lower cost of metals purchased from third parties.		99.5
•	Higher depreciation, amortization and depletion expense due to our expansion and maintenance investments.		90.1
•	Higher selling, general and administrative expenses.		29.2
•	Higher exploration expense.		0.4
Operating cost and expenses for 2019		$	4,532.6

							Variance
NON‑OPERATING INCOME (EXPENSE)	2020		2019		2018		2020 - 2019		2019 - 2018
Interest expense	$	(393.4)	$	(372.9)	$	(360.9)	$	(20.5)	$	(12.0)
Capitalized interest		26.8		32.2		83.8		(5.4)		(51.6)
Other expense		(27.5)		(7.0)		(30.7)		(20.5)		23.7
Interest income		19.2		21.2		16.0		(2.0)		5.2
Total non‑operating income (expense)	$	(374.9)	$	(326.5)	$	(291.8)	$	(48.4)	$	(34.7)

2020-2019: Non-operating income and expense were a net expense of $374.9 million in 2020 compared to a net expense of $326.5 million in 2019. The $48.4 million increase in net expense in 2019 was mainly due to:

● $ 20.5 million increase in the miscellaneous expense, net, principally due to a $24.2 million provision related to rain damages at our Peruvian operations.

● $ 20.5 million increase in interest expense, which was attributable to the Minera Mexico debt issuance in September 2019;

● $ 5.4 million decrease in capitalized interest, given that completed projects in Peru have been transferred to operations, and

● $ 2.0 million of lower interest income.

2019-2018: Non-operating income and expense were a net expense of $326.5 million in 2019 compared to a net expense of $291.8 million in 2018. The $34.7 million increase in net expense in 2019 was mainly due to:

● $ 51.6 million of lower capitalized interest, as completed projects in Peru have been transferred to operations.

● $ 12.0 million of higher interest expense due to the Minera Mexico debt issuance in September 2019; partially offset by,

● $ 23.7 million of lower miscellaneous expense, net, which includes a $25.0 million insurance payment due to rain damages suffered in our Peruvian operations, and

● $ 5.2 million of higher interest income.

Income taxes

	Year Ended
	December 31,
	2020			2019			2018
Provision for income taxes ($ in millions)	$	1,174.4		$	945.3		$	1,053.5
Effective income tax rate		42.8	%		39.0	%		40.7	%

The income tax provision includes Peruvian, Mexican and U.S. federal and state income taxes.

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Components of income tax provision for 2020, 2019 and 2018 include the following ($ in millions):

	2020		2019		2018
Statutory income tax provision	$	1,020.9	$	831.4	$	903.4
Tax reform adjustment		—		—		30.9
Peruvian royalty		31.4		14.2		9.0
Mexican royalty		72.1		61.6		79.6
Peruvian special mining tax		50.0		38.1		30.6
Total income tax provision	$	1,174.4	$	945.3	$	1,053.5

The increase in the 2020 effective income tax rate from the prior year was primarily attributable to a movement in exchange gains and losses from the devaluation of the Mexican peso and the Peruvian sol against the U.S. dollar; an increase in the Peruvian special mining tax; and an increase in the Mexican and Peruvian royalty. In 2018 the Company, pursuant to SAB 118, completed its analysis of the effects of the 2017 U.S. tax reform and recorded a non-cash tax provision of $30.9 million in addition to the non-cash amount of $785.9 recorded in 2017. After applying the conditions of US tax reform in 2017, the aforementioned led to a total non-cash tax provision for 2017 and 2018 to $816.8 million.

Equity earnings of affiliate

In 2020, 2019 and 2018 we recognized $6.4 million, $10.7 million and $12.3 million in equity earnings, respectively, which were associated with our 44.2% interest in the Tantahuatay mine.

Net Income attributable to the non-controlling interest

Net income attributable to the non-controlling interest in 2020 was $7.4 million, compared to $6.1 million in 2019, and $5.2 million in 2018. This increased in 2020 and 2019 by $1.3 million and $0.9 million respectively. These changes were the result of higher earnings at our Peruvian operations in both years.

Income attributable to SCC

Our net income attributable to SCC in 2020 was $1,570.4 million, compared to $1,485.8 million in 2019 and $1,543.0 million in 2018. The increase in 2020 net income attributable to SCC was mainly due to growth in net sales. Net income attributable to SCC decreased in 2019, which was mainly due to increases in the cost of sales and depreciation, amortization and depletion.

SEGMENT RESULTS ANALYSIS

We have three segments: the Peruvian operations, the Mexican open-pit operations and the Mexican underground mining operations. Please see a detailed definition of these segments in Item 1 “Business—Business Reporting Segments.”

The following table presents the volume of sales by segment of copper and our significant by-products for each of the years in the three-year period ended December 31, 2020:

				Variance
Copper Sales (million pounds)	2020	2019	2018	2020 - 2019	2019 - 2018
Peruvian operations	964.2	959.3	759.4	4.9	199.9
Mexican open‑pit	1,330.7	1,214.0	1,193.6	116.7	20.4
Mexican IMMSA unit	31.7	18.7	19.0	13.0	(0.3)
Other and intersegment elimination	(20.7)	(18.2)	(19.0)	(2.5)	0.8
Total copper sales	2,305.9	2,173.8	1,953.0	132.1	220.8

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				Variance
By‑product Sales (million pounds, except silver—million ounces)	2020	2019	2018	2020 - 2019	2019 - 2018
Peruvian operations:
Molybdenum contained in concentrate	31.3	23.2	16.0	8.1	7.2
Silver	5.9	5.8	4.5	0.1	1.3
Mexican open‑pit operations:
Molybdenum contained in concentrate	35.4	36.0	32.6	(0.6)	3.4
Silver	11.7	11.5	11.3	0.2	0.2
IMMSA unit
Zinc‑refined and in concentrate	230.9	228.5	234.8	2.4	(6.3)
Silver	7.5	5.2	5.5	2.3	(0.3)
Other and intersegment elimination
Silver	(2.7)	(1.9)	(1.9)	(0.8)	—
Total by‑product sales
Molybdenum contained in concentrate	66.7	59.2	48.6	7.5	10.6
Zinc‑refined and in concentrate	230.9	228.5	234.8	2.4	(6.3)
Silver	22.4	20.6	19.4	1.8	1.2

Peruvian Open-pit Operations:

							Variance
	2020		2019		2018		2020 - 2019		2019 - 2018
Net sales	$	3,153.6	$	2,940.1	$	2,572.2	$	213.5	$	367.9
Operating costs and expenses		(2,055.2)		(2,085.2)		(1,802.0)		30.0		(283.2)
Operating income	$	1,098.4	$	854.9	$	770.2	$	243.5	$	84.7

Net sales:

2020-2019: Net sales in 2020 increased by $213.5 million compared to the amount recorded in 2019, which was mainly attributable to an increase in sales volumes for copper (+0.5%), molybdenum (+35.0%) and silver (+2.1%) and to higher copper and silver prices, partially offset by lower molybdenum prices.

2019-2018: Net sales in 2019 increased by $367.9 million, compared to 2018, mainly as a result of higher sales volumes of copper (+26.3%), molybdenum (+44.3%) and silver (+27.6%), which was partially offset by lower copper and molybdenum prices.

Operating costs and expenses:

2020-2019: Operating costs and expenses in 2020 decreased $30.0 million compared to 2019, which was primarily due to:

Operating costs and expenses for 2019		$	2,085.2
Less:
•	Decrease in other cost of sales (exclusive of depreciation, amortization and depletion) mainly due to lower fuel costs, operating contractors costs and lower labor costs.		(208.0)
•	Decrease in exploration expenses.		(7.1)
•	Decrease in selling, general and administrative expenses.		(0.9)
Plus:
•	Decrease in capitalized leachable material.		106.0
•	Increase in cost of metals purchased from third parties.		54.2
•	COVID-19 related costs.		25.2
•	Increase in depreciation, amortization and depletion expense.		0.6
Operating costs and expenses for 2020		$	2,055.2

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2019-2018: Operating costs and expenses in 2019 increased by $283.2 million, compared to 2018, principally due to:

Operating costs and expenses for 2018		$	1,802.0
Plus:
•	Increase in cost of sales (exclusive of depreciation, amortization and depletion) mainly due to higher repairing materials costs, operating contractors, power costs and higher workers’ participation expense; partially offset by lower inventory consumption and lower fuel costs.		192.7
•	Increase in depreciation, amortization and depletion expense due to our expansion and maintenance investments.		90.7
•	Increase in selling, general and administrative expenses.		1.8
Less:
•	Decrease in exploration expenses.		(2.0)
Operating costs and expenses for 2019		$	2,085.2

Operating income:

2020-2019: Operating income in 2020 increased by $243.5 million compared to the amount recorded in 2019, which was mainly attributable to a $213.5 million increase in sales and a $30.0 million decrease in operating costs and expenses, as explained above.

2019-2018: Operating income in 2019 increased by $84.7 million, compared to 2018, mainly as a result of a $367.9 million increase in sales, which was partially offset by a $283.2 million increase in operating costs and expenses, as explained above.

Mexican Open-pit Operations:

								Variance
		2020		2019		2018		2020 - 2019		2019 - 2018
Net sales	%	$	4,412.4	$	3,963.9	$	4,075.9	$	448.5	$	(112.0)
Operating costs and expenses	%		(2,431.3)		(2,045.4)		(2,028.7)		(385.9)		(16.7)
Operating income	%	$	1,981.1	$	1,918.5	$	2,047.2	$	62.6	$	(128.7)

Net sales:

2020-2019: Net sales in 2020 increased by $448.5 million compared to 2019. This increase was attributable to higher copper (+9.6%) and silver (+1.7%) sales volumes and to higher copper and silver prices; this increase was slightly offset by lower molybdenum prices.

2019-2018: Net sales in 2019 decreased by $112.0 million, compared to 2018, principally due to lower copper and molybdenum prices, partially reduced by higher sales volumes of molybdenum (+10.6%), copper (+1.7%) and silver (+1.6%).

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Operating costs and expenses:

2020-2019: Operating costs and expenses in 2020 increased by $385.9 million compared to 2019, which was mainly attributable to:

Operating costs and expenses for 2019		$	2,045.4
Plus:
•	Increase in cost and volume of metals purchased from third parties.		238.8
•	Decrease in capitalized leachable material.		112.2
•	COVID-19 related costs.		1.4
•	Increase in other cost of sales (exclusive of depreciation, amortization and depletion) mainly due to higher inventory consumption, and higher workers participation expense, partially offset by lower fuel costs.		26.1
•	Increase in exploration expenses.		0.7
•	Increase in depreciation, amortization and depletion expense.		14.8
Less:
•	Decrease in selling, general and administrative expenses.		(8.1)
Operating costs and expenses for 2020		$	2,431.3

2019-2018: Operating costs and expenses in 2019 increased by $16.7 million, compared to 2018, principally due to:

Operating costs and expenses for 2018		$	2,028.7
Plus:
•	Decrease in capitalized leachable material.		70.9
•	Increase in selling, general and administrative expenses.		23.3
•	Increase in cost of sales (exclusive of depreciation, amortization and depletion) mainly due to higher fuel and labor costs.		17.2
Less:
•	Decrease in cost and volume of metals purchased from third parties.		(86.0)
•	Decrease in depreciation, amortization and depletion expense.		(8.5)
•	Decrease in exploration expenses.		(0.2)
Operating costs and expenses for 2019		$	2,045.4

Operating income:

2020-2019: Operating income in 2020 increased by $62.6 million, compared to 2019, mainly as a result of $448.5 million of higher sales, which was partially offset by a $385.9 million increase in operating costs and expenses, as explained above.

2019-2018: Operating income in 2019 decreased by $128.7 million, compared to 2018, mainly as a result of a $112.0 million decrease in sales and a $16.7 million increase in operating costs and expenses, as explained above.

IMMSA unit:

							Variance
		2020		2019		2018	2020 - 2019		2019 - 2018
Net sales	$	529.9	$	464.8	$	527.9	$	65.1	$	(63.1)
Operating costs and expenses		(443.6)		(449.5)		(438.6)		5.9		(10.9)
Operating income	$	86.3	$	15.3	$	89.3	$	71.0	$	(74.0)

Net sales:

2020-2019: Net sales in 2020 increased $65.1 million compared to 2019. This increase was primarily due to an increase in copper (+69.7%), silver (+44.4%) and zinc (+1.0%) sales volumes and to higher copper and silver prices; this was slightly offset by lower zinc prices.

89

2019-2018: Net sales in 2019 decreased $63.1 million, compared to 2018, primarily due to lower silver (-6.1%), zinc (-2.6%) and copper (-1.9%) sales volumes, as well as lower copper and zinc prices.

Operating costs and expenses:

2020-2019: Operating costs and expenses in 2020 decreased by $5.9 million compared to 2019; this was principally due to:

Operating costs and expenses for 2019		$	449.5
Plus:
•	Increase in other cost of sales (exclusive of depreciation, amortization and depletion) mainly due to higher inventory consumption, higher workers' participation expense and foreign currency effect, partially offset by lower power and labor costs.		21.9
•	COVID-19 related costs.		1.1
•	Increase in selling, general and administrative expenses.		1.6
Less:
•	Decrease in cost of metals purchased from third parties.		(20.3)
•	Decrease in depreciation, amortization and depletion expense.		(9.8)
•	Decrease in exploration expenses.		(0.4)
Operating costs and expenses for 2020		$	443.6

2019-2018: Operating costs and expenses in 2019 increased by $10.9 million, compared to 2018, principally due to:

Operating costs and expenses for 2018		$	438.6
Plus:
•	Increase in depreciation, amortization and depletion expense.		4.7
•	Increase in exploration expenses.		3.8
•	Increase in other cost of sales (exclusive of depreciation, amortization and depletion) mainly due to higher inventory consumption and higher repairing materials costs.		32.7
Less:
•	Decrease in cost of metals purchased from third parties.		(29.7)
•	Decrease in selling, general and administrative expenses.		(0.6)
Operating costs and expenses for 2019		$	449.5

Operating income:

2020-2019: Operating income in 2020 increased by $71.0 million, compared to 2019, mainly as a result of a $65.1 million increase in sales and a $5.9 million decrease in operating costs and expenses, as explained above.

2019-2018: Operating income in 2019 decreased by $74.0 million, compared to 2018, mainly as a result of a $63.1 million decrease in sales and a $10.9 million increase in operating costs and expenses, as explained above.

Intersegment Eliminations and Adjustments:

The net sales, operating costs and expenses and operating income discussed above will not be directly equal to amounts in our consolidated statement of earnings because the adjustments to intersegment operating revenues and expenses must be taken into account. Please see Note 18 “Segment and Related Information” of the consolidated financial statements.

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LIQUIDITY AND CAPITAL RESOURCES

The following discussion relates to our liquidity and capital resources for each of the years in the three-year period ended December 31, 2020.

Cash Flow:

The following table shows the cash flow for the three year period ended December 31, 2020 (in millions):

							Variance
	2020		2019		2018		2020 - 2019		2019 - 2018
Net cash provided by operating activities	$	2,783.6	$	1,911.9	$	2,235.1	$	871.7	$	(323.2)
Net cash used in investing activities	$	(915.8)	$	(574.0)	$	(1,296.2)	$	(341.8)	$	722.2
Net cash used in financing activities	$	(1,563.3)	$	(262.2)	$	(1,083.4)	$	(1,301.1)	$	821.2

Net cash provided by operating activities:

The 2020, 2019 and 2018 change in net cash from operating activities include (in millions):

							Variance
	2020		2019		2018		2020 - 2019		2019 - 2018
Net income	$	1,577.8	$	1,491.9	$	1,548.2	$	85.9	$	(56.3)
Depreciation, amortization and depletion		775.6		764.4		674.3		11.2		90.1
Benefit for deferred income taxes		(63.5)		(21.0)		(51.5)		(42.5)		30.5
Loss on foreign currency transaction effect		0.9		17.9		17.3		(17.0)		0.6
Other adjustments to net income		9.1		5.7		23.1		3.4		(17.4)
Operating assets and liabilities		483.7		(347.0)		23.7		830.7		(370.7)
Net cash provided by operating activities	$	2,783.6	$	1,911.9	$	2,235.1	$	871.7	$	(323.2)

Significant items added to (deducted from) net income to arrive at operating cash flow include depreciation, amortization and depletion, deferred tax amounts and changes in operating assets and liabilities.

2020: Net income was $1,577.8 million, which represented approximately 56.7% of the net operating cash flow. A net increase in operating assets and liabilities increased operating cash flow by $483.7 million, which was attributable to the following variances in operating assets and liabilities:

● $(236.0) million increase in trade accounts receivable, which was mainly driven by a significant increase in copper prices during the last quarter of 2020.

● $223.6 million of net decrease in inventory, which included a $165.2 million decrease in the leaching inventory mainly at our Peruvian operations, and a $36.4 million decrease in the finished goods inventory, principally at our Mexican operations.

● $313.8 million increase in accounts payable and accrued liabilities, which primarily reflected growth in income taxes and workers’ participation accruals at our Peruvian and Mexican operations.

● $182.3 million decrease in other operating assets and liabilities, which mainly included a decrease in prepaid taxes and a drop in receivables to related parties.

2019: Net income was $1,491.9 million, which represented approximately 78% of the net cash provided by operating activities. A net decrease in operating assets and liabilities decreased operating cash flow by $347.0 million and included:

● $(184.9) million decrease in accounts payable and accrued liabilities, which included principally income taxes and workers’ participation payments as a result of higher earnings at our Mexican and Peruvian operations in 2018.

● $(10.5) million increase in trade accounts receivable mainly because of higher sales volumes at our Peruvian operations.

91

● $(88.7) million of net increase in inventory, which included $(83.2) million of higher leaching inventory and $(17.6) million of higher finished goods mainly at our Mexican operations.

● $(62.9) million increase in other operating assets and liabilities which included principally an increase in prepaid taxes in our Mexican operations due to changes in tax legislation.

2018: Net income was $1,548.2 million, which represented approximately 69% of the net cash provided by operating activities. A net increase in operating assets and liabilities increased operating cash flow by $23.7 million and included:

● $117.8 million increase in accounts payable and accrued liabilities.

● $68.3 million decrease in trade accounts receivable.

● $(190.8) million of net increase in inventory, which included $(207.1) million of higher leaching inventory, $(20.7) million of higher finished goods and $(14.0) million of higher supplies inventories for our operations, partially offset by $51.2 million of lower metals in process inventory.

● $28.4 million decrease in other operating assets and liabilities.

Net cash used in investing activities:

2020: Net cash used for investing activities in 2020 included $592.2 million for capital investments. This included $397.2 million of investments at our Mexican operations and $195.0 million at our Peruvian operations. For further information, please see “Capital Investment Program” under this Item on page 76.

The 2020 investing activities also included net purchases of short-term investments of $330.1 million.

2019: Net cash used for investing activities in 2019 included $707.5 million for capital investments. This included $357.4 million of investments at our Mexican operations and $350.1 million at our Peruvian operations. For further information, please see “Capital Investment Program” under this Item on page 76.

The 2019 investing activities also included net sales of short-term investments of $133.1 million.

2018: Net cash used for investing activities in 2018 included $1,121.4 million for capital investments. This included $347.4 million of investments at our Mexican operations and $774.0 million at our Peruvian operations. For further information, please see “Capital Investment Program” under this Item on page 76.

The 2018 investing activities also included net purchases of short-term investments of $163.3 million.

Net cash used in financing activities:

2020: Net cash used in financing activities in 2020 was $1,563.3 million and mainly included:

● A dividend distribution of $1,159.6 million.

● A debt repayment of $400 million.

2019: Net cash used in financing activities in 2019 was $262.2 million and mainly included:

● A dividend distribution of $1,236.9 million.

● Gross proceeds of $987.3 million from the issuance of senior notes by our Mexican subsidiary.

● Payment of debt issuance costs of $9.8 million.

2018: Net cash used in financing activities in 2018 was $1,083.4 million and included a dividend distribution of $1,082.3 million.

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Other Liquidity Considerations

We expect that we will meet our cash requirements for 2021 and beyond from cash on hand and internally generated funds. In addition, we believe that we will be able to access additional external financing on reasonable terms, if required.

As of December 31, 2020, $1,297.3 million of the Company´s total cash, cash equivalents and short-term investments of $2,594.4 million were held by foreign subsidiaries. The cash, cash equivalents and short-term investments maintained in our foreign operations are generally used to cover local operating and investment expenses. Earnings of the Company’s Peruvian branch are not subject to transition taxes since they are taxed in the United States on a current basis.

Share repurchase program: In 2008, our Board of Directors (“BOD”) authorized a $500 million share repurchase program that has since been increased by the BOD and is currently authorized to $3 billion. Since the inception of the program through December 31, 2020, we have purchased 119.5 million shares of our common stock at a cost of $2.9 billion. These shares are available for general corporate purposes. We may purchase additional shares of our common stock from time to time based on market conditions and other factors. This repurchase program has no expiration date and may be modified or discontinued at any time. For further details please see Item 5 “Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities—SCC common stock repurchase plan.”

Dividend: On January 21, 2021, the BOD authorized a dividend of $0.60 per share to be paid on February 24, 2021 to shareholders of record at the close of business on February 10, 2021.

FINANCING

Our total debt at December 31, 2020 was $6,544.2 million, compared to $6,940.8 million at December 31, 2019, net of the unamortized discount and issuance costs of notes issued under par for $107.0 million and $110.4 million as of December 31, 2020 and 2019 respectively. This debt is all denominated in dollars at fixed interest rates, weighed at 5.69%.

The ratio of total debt to total capitalization was 47.4% as of December 31, 2020, compared to 50.2% as of December 31, 2019. In addition, the ratio of net debt to net capitalization was 35.2% as of December 31, 2020, compared to 41.8% as of December 31, 2019.

We define net debt as total debt, including current maturities, minus cash, cash equivalents and short-term investments balance. We believe that net debt is useful to investors as a measure of our financial position. We define net capitalization as the sum of net debt and equity. We use the net debt to net capitalization ratio as measure of our indebtedness position and to determine how much debt we can take in addition to the use of the equity and of the balance sheet in general. We define total capitalization as the sum of the carrying values of our total debt, including current maturities and equity. A reconciliation of our net debt to net capitalization and total debt to total capitalization as included in the consolidated balance sheet is presented under the sub heading “Non-GAAP Information Reconciliation” below.

Please see Note 11 “Financing” for a discussion about the covenants requirements related to our long-term debt.

Capital Investment Program

A discussion of our capital investment program is an important part of understanding our liquidity and capital resources. We expect to meet the cash requirements for these capital investments from cash on hand, internally generated funds and from additional external financing if required. For information regarding our capital expenditure programs, please see the discussion under the caption “Capital Investment Program” under this Item 7.

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CONTRACTUAL OBLIGATIONS

The following table summarizes our significant contractual obligations as of December 31, 2020:

			Payments due by Period
													2026 and
	Total		2021		2022		2023		2024		2025		Thereafter
			(dollars in millions)
Long‑term debt	$	6,651.1	$	—	$	300.0	$	—	$	—	$	500.0	$	5,851.1
Interest on debt		7,511.2		380.0		378.5		369.4		369.5		359.6		5,654.2
Uncertain tax position(a)		66.1		—		—		—		—		—		—
Workers’ participation		247.8		247.8		—		—		—		—		—
Pension and post‑retirement obligations		39.2		4.6		3.3		3.3		3.5		3.4		21.1
Operating leases		1,272.1		114.7		113.7		112.3		104.7		103.7		723.0
Asset retirement obligation		545.0		—		—		—		—		—		545.0
Purchase obligations:
Commitments to purchase energy		2,859.2		240.9		240.9		259.3		259.3		259.3		1,599.5
Capital investment projects		365.8		356.1		9.7		—		—		—		—
Total	$	19,557.5	$	1,344.1	$	1,046.1	$	744.3	$	737.0	$	1,226.0	$	14,393.9

(a) The above table does not include any scheduled payments related to U.S. uncertain tax position liabilities because there is often a high degree of uncertainty regarding the timing of future cash outflows. As of December 31, 2020, the tax liability recognized by the Company is $66.1 million and is netted against the deferred tax asset in the consolidated Balance Sheet. Please refer to Note 7 “Income Taxes” of the consolidated financial statements.

Long-term debt payments do not include the debt discount valuation account and issuance costs of $107.0 million.

Interest on debt is calculated at rates in effect at December 31, 2020. As all our debt is at fixed rates, future expenditures will not change due to rate changes. Please refer to Note 11 “Financing” of the consolidated financial statements for a description of our long-term debt arrangements and credit facilities.

Workers’ participation is currently calculated based on Peruvian Branch and Mexican pre-tax earnings. In Peru, the provision for workers’ participation is calculated at 8% of pre-tax earnings. The current portion of this participation, which is accrued during the year, is based on the Peruvian Branch’s taxable income and is largely distributed to workers after final results are determined for the year. Amounts in excess of 18 times a worker’s salary are distributed to governmental bodies. In Mexico, workers’ participation is determined using the guidelines established in the Mexican income tax law at a rate of 10% of pre-tax earnings as adjusted by the tax law.

Operating leases include lease payments for power generating facilities to MGE, vehicles and properties. Please refer to Note 9 “Leases” of the consolidated financial statements.

Pension and post retirement obligations include the benefits expected to be paid under our pension and post-retirement benefit plans. Please refer to Note 12 “Benefit Plans” of the consolidated financial statements.

Asset retirement obligations include the aggregate amount of closure and remediation costs for our Peruvian mines and facilities to be paid under the mine closure plans approved by MINEM and the closure and remediation costs of our Mexican operations. See Note 10 “Asset Retirement Obligation.”

In June 2014, we entered into a power purchase agreement for 120 megawatt (“MW”) with the state company Electroperu S.A., which began supplying energy for our Peruvian operations for twenty years starting on April 17, 2017. In July 2014, we entered into a power purchase agreement for 120MW with a private power generator Kallpa Generacion S.A. (“Kallpa”), which began supplying energy for our Peruvian operations for ten years starting on April 17, 2017. In May 2016, we signed an additional power purchase agreement for a maximum of 80MW with Kallpa,

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under which Kallpa will supply energy to the operations related to the Toquepala Expansion and to other minor projects for ten years starting on May 1, 2017 and ending after ten years of commercial operation of the Toquepala Expansion or on April 30, 2029; whichever occurs first.

Additionally, we have a commitment to purchase power for our Mexican operations from MGE, a subsidiary of Grupo Mexico through 2032. See Note 13 “Commitment and Contingencies—Other commitments”.

Amounts indicated in the table above are based on our long-term estimated power costs, which are subject to change as energy generation costs change and our forecasted power requirements through the life of the agreements change.

Capital investment projects include committed purchase orders and executed contracts for our Mexican projects and for our Peruvian expansion projects at Tia Maria and the Toquepala mine.

CYBERSECURITY

Our operations depend upon information technology systems that may be subject to disruption, damage or failure from different sources, including, without limitation, installation of malicious software, computer viruses, security breaches, cyber-attacks and defects in design. In recent years, cybersecurity incidents have increased in frequency and include, but are not limited to, malicious software, attempts to gain unauthorized access to data and other electronic security breaches that could lead to disruptions in systems, unauthorized release of confidential or otherwise protected information and the corruption of data. We have implemented appropriate preventative measures to mitigate potential risks by implementing an information security management system, which ensures implementing controls that are frequently reviewed and tested, including a risk matrix that considers the possible threats through an impact and probability analysis, actions to avoid or mitigate them and the corresponding testing plan. In 2020, we did not have any material cybersecurity breaches in our systems.

CLIMATE CHANGE

Peruvian operations: On April 17, 2018, the Peruvian government enacted Law N. 30754, establishing a Climate Change Framework. Through this law, promoting public and private investments in climate change management is declared to be of national interest. The law proposes to create an institutional framework to address climate change in Peru, outlining new measures, particularly with respect to climate change mitigation. It includes, for example, provisions regarding: increasing carbon capture and use of carbon sinks; afforestation and reforestation practices; land use changes; and sustainable systems of transportation, solid waste management, and energy systems. This is the first climate change framework law in Latin America to incorporate obligations from the Paris Agreement. Regulations to this law were enacted by Supreme Decree 013-2019, which was published on December 31, 2019 and are applicable to all Peruvian institutions and agencies. It is expected that further Peruvian regulations will be applicable to non-governmental entities. The Company anticipates initiating a multi-year process to adopt applicable reporting recommendations of the Task-Force on Climate Related Financial Disclosures (TCFD) once new Peruvian climate change regulations applicable to non-governmental entities are implemented. The Company is committed to the environment and to managing climate-related impacts. The Company’s focus is to seek continuous improvement in the responsible use of natural resources while complying with strict applicable legal standards for prevention, mitigation, control and remediation of environmental impacts. Implementing continuous improvement in the Company’s processes improves efficiency in the use and consumption of energy, water, and other natural resources.

Mexican operations: Grupo Mexico, the indirect parent of SCC has issued sustainability reports under the Global Reporting Initiative (GRI) for more than 10 years. Grupo Mexico also participates in different Mexican and international reporting programs such as the Greenhouse Gases (GHG) Mexico Program and CDP (formerly the Carbon Disclosure Project). In 2013, GHG and CDP signed a memorandum of understanding to work on aligning their reporting frameworks. Grupo Mexico’s 2018 CDP questionnaire included responses to the Task Force on Climate-Related Disclosure or TCFD concerns. In compliance with the 2012 Mexican Climate Change Law, Grupo Mexico’s GHG emissions are reported and verified independently. Grupo Mexico’s Sustainability Reports, which disclose inventories of GHG emissions, can be found at “https://www.gmexico.com/en/Pages/development.aspx”. On October 18, 2017, Grupo Mexico was selected to join the S&P Sustainability Indices MILA Pacific Alliance (DJSI MILA). In 2017, this regional

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sustainability index included 42 leading companies in sustainability from the countries that form part of the Pacific Alliance: Mexico, Chile, Colombia and Peru.

NON-GAAP INFORMATION RECONCILIATION

Operating cash cost: Following is a reconciliation of “Operating Cash Cost” (see page 74) to cost of sales (exclusive of depreciation, amortization and depletion) as reported in our consolidated statement of earnings, in millions of dollars and dollars per pound in the table below:

	2020				2019				2018
			$ per				$ per				$ per
	$ millions		pound		$ millions		pound		$ millions		pound
Cost of sales (exclusive of depreciation, amortization and depletion)	$	3,929.8	$	1.84	$	3,606.4	$	1.69	$	3,409.0	$	1.81
Add:
Selling, general and administrative		126.2		0.06		131.8		0.06		102.6		0.05
Sales premiums, net of treatment and refining charges		17.0		0.01		28.7		0.02		13.9		0.01
Less:
Workers’ participation		(263.9)		(0.13)		(214.5)		(0.10)		(226.1)		(0.12)
Cost of metals purchased from third parties		(495.2)		(0.23)		(263.4)		(0.12)		(384.5)		(0.20)
Royalty charge and other, net		(171.6)		(0.08)		(125.7)		(0.06)		(125.0)		(0.07)
Inventory change		(218.6)		(0.10)		67.6		0.03		114.5		0.06
Operating Cash Cost before by‑product revenues	$	2,923.7	$	1.37	$	3,230.9	$	1.52	$	2,904.4	$	1.54
Add:
By‑product revenues(1)		(1,375.9)		(0.64)		(1,307.3)		(0.61)		(1,211.4)		(0.64)
Net revenue on sale of metal purchased from third parties		(80.0)		(0.04)		(51.9)		(0.03)		(56.3)		(0.03)
Total by‑product revenues		(1,455.9)		(0.68)		(1,359.2)		(0.64)		(1,267.7)		(0.67)
Operating Cash Cost net of by‑product revenues		1,467.8		0.69		1,871.7		0.88		1,636.7		0.87
Total pounds of copper produced (in millions)		2,136.1				2,133.3				1,886.8

(1) By-product revenues included in our presentation of operating cash cost contain the following:

	2020				2019				2018
			$ per				$ per				$ per
	$ millions		pound		$ millions		pound		$ millions		pound
Molybdenum	$	(510.3)	$	(0.24)	$	(549.4)	$	(0.26)	$	(509.9)	$	(0.27)
Silver		(415.5)		(0.19)		(278.3)		(0.13)		(244.5)		(0.13)
Zinc		(202.9)		(0.10)		(211.5)		(0.10)		(229.5)		(0.12)
Sulfuric Acid		(135.9)		(0.06)		(158.8)		(0.07)		(111.3)		(0.06)
Gold		(73.6)		(0.03)		(53.2)		(0.03)		(53.1)		(0.03)
Other		(37.7)		(0.02)		(56.1)		(0.02)		(63.1)		(0.03)
Total	$	(1,375.9)	$	(0.64)	$	(1,307.3)	$	(0.61)	$	(1,211.4)	$	(0.64)

The by-product revenue presented does not match with the sales value reported by segment on page 157 because the above table excludes purchases from third parties, which are reclassified to net revenue on sale of metal purchased from third parties.

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Net debt to net capitalization: Net debt to net capitalization as of December 31, 2020 and 2019 is as follows:

	2020			2019
Total debt	$	6,544.2		$	6,940.8
Cash and cash equivalents		(2,183.6)			(1,925.1)
Short‑term investments		(410.8)			(80.7)
Net debt		3,949.8			4,935.0
Net capitalization:
Net debt		3,949.8			4,935.0
Equity		7,276.0			6,858.2
Net capitalization	$	11,225.8		$	11,793.2
Net debt/net capitalization(*)		35.2	%		41.8	%

(*) Represents net debt divided by net capitalization.

Total debt to total capitalization: Total debt to total capitalization as of December 31, 2020 and 2019 is as follows:

	2020			2019
Total debt	$	6,544.2		$	6,940.8
Capitalization
Debt		6,544.2			6,940.8
Equity		7,276.0			6,858.2
Total capitalization	$	13,820.2		$	13,799.0
Total debt/total capitalization(*)		47.4	%		50.3	%

(*) Represents debt divided by total capitalization.

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ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Commodity price risk:

For additional information on metal price sensitivity, refer to “Metal Prices” in Part II, Item 7 of this annual report.

Open sales risk:

Our provisional copper and molybdenum sales contain an embedded derivative that is required to be separate from the host contract for accounting purposes. The host contract is the receivable from the sale of copper or molybdenum concentrates at prevailing market prices at the time of the sale. The embedded derivative, which does not qualify for hedge accounting, is marked to market through earnings in each period prior to settlement. See Note 18 to the consolidated financial statements for further information about these provisional sales.

Foreign currency exchange rate risk:

Our functional currency is the U.S. dollar. Portions of our operating costs are denominated in Peruvian soles and Mexican pesos. Given that our revenues are primarily denominated in U.S. dollars, when inflation or deflation in our Mexican or Peruvian operations is not offset by a change in the exchange rate of the sol or the peso to the dollar, our financial position, results of operations and cash flows could be affected by local cost conversion when expressed in U.S. dollars. In addition, the dollar value of our net monetary assets denominated in soles or pesos can be affected by an exchange rate variance of the sol or the peso, resulting in a re-measurement gain or loss in our financial statements. Recent inflation and exchange rate variances for the three years ended December 31, 2020 are provided in the table below:

	Year Ended
	December 31,
	2020		2019		2018
Peru:
Peruvian inflation rate	2.0	%	1.9	%	2.5	%
Initial exchange rate	3.317		3.379		3.245
Closing exchange rate	3.624		3.317		3.379
Appreciation/(devaluation)	(9.3)	%	1.8	%	(4.1)	%
Mexico:
Mexican inflation rate	3.2	%	2.8	%	4.8	%
Initial exchange rate	18.845		19.683		19.735
Closing exchange rate	19.949		18.845		19.683
Appreciation/(devaluation)	(5.9)	%	4.3	%	0.3	%

Change in monetary position:

Assuming an exchange rate variance of 10% at December 31, 2020, we estimate our net monetary position in Peruvian sol and Mexican peso would increase (decrease) our net earnings as follows:

	Effect in net
	earnings
	($ in millions)
Appreciation of 10% in U.S. dollar vs. Peruvian sol	$	27.2
Devaluation of 10% in U.S. dollar vs. Peruvian sol	$	(33.2)
Appreciation of 10% in U.S. dollar vs. Mexican peso	$	11.5
Devaluation of 10% in U.S. dollar vs. Mexican peso	$	(14.0)

The net monetary position is net of those assets and liabilities that are sol or peso denominated as of December 31, 2020.

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Short-term investments:

For additional information on our trading securities and available-for-sale investments, refer to Note 3 Short-term Investments in Part II, Item 8 of this annual report.

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ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTAL DATA

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of Southern Copper Corporation:

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of Southern Copper Corporation and subsidiaries (the “Company”) as of December 31, 2020 and 2019, the related consolidated statements of earnings, comprehensive income, changes in stockholders´ equity, and cash flows for each of the three years in the period ended December 31, 2020 and the related notes and schedule listed in the Index at Item 15 (collectively referred to as the “financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2020 and 2019, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2020, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting as of December 31, 2020 based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 25, 2021 expressed an unqualified opinion on the Company’s internal control over financial reporting.

Basis for Opinion

These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s consolidated financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.

Emphasis of a Matter

We draw attention to Note 1 of the financial statements, which describes the effects of the outbreak of coronavirus disease ("COVID-19") as of December 31, 2020 and for year then ended.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current-period audit of the financial statements that were communicated or required to be communicated to the audit committee and that (1) relate to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.

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Ore stockpiles on Leach Pads – Refer to Note 4 to the financial statements

Critical Audit Matter Description

The Company has recorded Ore stockpiles on leach pads of $1,423.5 million as of December 31, 2020 ($298.5 million presented as current and $1,125.0 million presented as non-current assets), for the capitalization of inventory costs related to leachable material.

The Company used the recoverable copper content grade when determining the capitalization of inventory costs related to leachable material. The leachable material inventory determined could be misstated if the monthly average recoverable copper content grade and the solubility index used by the Company does not correspond to the actual results obtained from the laboratories.

We identified the copper content grade and solubility index as a critical audit matter because of the significant judgments made by management to support its assertion that these capitalized costs are probable of recovery. Addressing this matter required a high degree of auditor judgment in evaluating whether the audit evidence obtained supports management’s assertion that these costs are probable of future recovery.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to management’s assertions that extraction and movement of material costs are capitalized in the appropriate amounts included the following, among others:

● We tested the effectiveness of controls over management’s review of the copper content grade used to determine the monthly average rate to be used in the calculation, which included an evaluation of the competence, objectivity and authority of the personnel involved in the determination of the copper content grade and the solubility index; the identification of costs to be capitalized as part of the leaching process; and reconciliations of mineral received for the leaching process.

● We tested the effectiveness of controls that ensure that the net realizable value was higher than the unit cost for the leachable material capitalized to conclude that no impartment existed. We performed control testing to ensure that the net realizable value was higher than the unit cost for the leachable material capitalized to conclude that no impartment existed.

● We tested the effectiveness of general IT controls for the relevant systems identified that process information that are considered significant inputs in the calculation of the Company’s estimate.

● We developed an independent expectation of the amounts of leachable material that should have been capitalized and amortized to compare it to the recorded balances.

● We independently recalculated the monthly average copper content grade and the monthly average solubility index to obtain the reasonability of the inputs used in the estimate.

● We performed a recalculation of the net realizable value and the total tons to determine that the unit cost was lower than the net realizable value. To determine the net realizable value we considered the annual average price, premium and sales expenses.

● We involved technical specialists to evaluate the methodology used by the Company to determine the recoverability of copper from the leach pads and challenge, from a technical perspective, if the balance as of December 31, 2020 represents copper that will be recovered as estimated by the Company.

Uncertain Tax Positions (Deferred income tax) – Refer to Note 7 to the financial statements

Critical Audit Matter Description

In accordance with ASC 740 - Income Taxes, the Company must perform an analysis to determine that Uncertain Tax Positions (UTPs) are identified, evaluated, valued, recorded and disclosed in the Company’s consolidated financial statements in the correct period and amounts. The Company’s UTPs as of December 31, 2020, were $66.1 million.

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We identified the UTPs as a critical audit matter because of the multiple jurisdictions in which the Company files its tax returns and the complexity of the tax laws and regulations. This identification process includes resolution of any related appeals or litigation processes that are based on the technical merits of the position. In evaluating whether a tax position has met the more-likely-than-not recognition threshold, the Company must presume that the position will be examined by the appropriate taxing authority that has full knowledge of all relevant information. As the Company operates in three different jurisdictions, this requires a high degree of auditor judgment and an increased extent of effort, including the need to involve our income tax specialists, when performing audit procedures to evaluate the reasonableness of how management determines whether it is more likely than not that a tax position will be sustained upon examination.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to UTPs included the following, among others:

● We tested the effectiveness of internal controls that address management processes to identify, evaluate, value, record and disclose significant UTPs.

● With the assistance of our income tax specialists, we read and evaluated management’s documentation obtained an understanding of potential UTPs including, the annual tax returns filed, calculations prepared by management, reconciliation of footnote disclosures.

● We made inquiries of management, including the Company’s tax department and internal legal counsel, regarding the identification and status of UTPs.

● We obtained confirmation letters from the Company’s external lawyers to evaluate whether any tax contingencies existed and determine completeness of the UTPs identified.

● We substantively tested UTPs on a sample basis obtaining evidence to evaluate whether the likelihood of occurrence criteria (more likely than not) has been applied appropriately and tax positions were measured at maximum amounts by applying the likelihood of occurrence criterion.

● We evaluated whether the estimates of UTPs were consistent with evidence obtained in other areas of the audit.

Estimate of Tia Maria Project Impairment Indicators (Property and mine development, net) – Refer to Notes 5 and 13 to the financial statements

Critical Audit Matter Description

The Tia Maria mining project in Peru has already received the construction license approval from the Peruvian Mining Council on October 30, 2019. The Company's commitment is to begin the development of the project within the framework of a favorable social atmosphere, working with the local population. This project budget is approximately $1.4 billion and has an investment as of December 31, 2020 of approximately $338.8 million that includes investment in property, plant and equipment of $220.1 million and $118.7 million representing intangible assets primarily composed of engineering studies and the Environmental Impact Study (EIS). The Company evaluates long-term assets when events or changes in economic circumstances indicate that the carrying amount of such assets may not be recoverable. The Company’s evaluations are based on business plans that are prepared using a time horizon that is reflective of their expectations of metal prices, costs and other economic variables over its business cycle.

We considered that the engineering studies and the EIS and other permits and studies composing the intangible assets balance could be impaired if the business plans of the Company changes or other external factors occur once the construction begins.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to identification of events or changes in circumstances that may indicate the carrying amount of the intangibles related to the Tia Maria Project may not be recoverable included the following, among others:

● We tested the effectiveness of controls over management’s identification of possible circumstances that may indicate that the carrying amounts are no longer recoverable.

● We obtained support documentation to ensure that the main inputs used in the business model were reasonable.

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● We read publicly available information regarding projections of copper prices.

● We obtained support documentation to test the stress testing performed by management over the business model, considering changes in main variables impacting the model such as copper price and cost changes (increases/decreases), among others and appropriate evidence to conclude that no impairment indicators existed as of December 31, 2020.

Galaz, Yamazaki, Ruiz Urquiza, S.C.

Member of Deloitte Touche Tohmatsu Limited

/s/ DANIEL TOLEDO ANTONIO

C.P.C. Daniel Toledo Antonio

We have served as the Company’s auditor since 2009

Mexico City, Mexico

February 25, 2021

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Southern Copper Corporation

and Subsidiaries

CONSOLIDATED STATEMENTS OF EARNINGS

For the years ended December 31, (in millions, except for per share amounts)	2020		2019		2018
Net sales (including sales to related parties, see note 17)	$	7,984.9	$	7,285.6	$	7,096.7
Operating cost and expenses:
Cost of sales (exclusive of depreciation, amortization and depletion shown separately below)		3,929.8		3,606.4		3,409.0
Selling, general and administrative		126.2		131.8		102.6
Depreciation, amortization and depletion		775.6		764.4		674.3
Exploration		32.6		30.0		29.6
Total operating costs and expenses		4,864.2		4,532.6		4,215.5
Operating income		3,120.7		2,753.0		2,881.2
Interest expense		(393.4)		(372.9)		(360.9)
Capitalized interest		26.8		32.2		83.8
Other income (expense)		(27.5)		(7.0)		(30.7)
Interest income		19.2		21.2		16.0
Income before income taxes		2,745.8		2,426.5		2,589.4
Income taxes (including royalty taxes, see Note 7)		1,237.9		966.3		1,105.0
Deferred income taxes		(63.5)		(21.0)		(51.5)
Net income before equity earnings of affiliate		1,571.4		1,481.2		1,535.9
Equity earnings of affiliate, net of income tax		6.4		10.7		12.3
Net income		1,577.8		1,491.9		1,548.2
Less: Net income attributable to the non-controlling interest		7.4		6.1		5.2
Net income attributable to SCC	$	1,570.4	$	1,485.8	$	1,543.0
Per common share amounts attributable to SCC:
Net earnings-basic and diluted	$	2.03	$	1.92	$	2.00
Weighted average shares outstanding-basic and diluted		773.1		773.1		773.0

The accompanying notes are an integral part of these consolidated financial statements.

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Southern Copper Corporation

and Subsidiaries

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	2020		2019		2018
	(in millions)
COMPREHENSIVE INCOME:
Net income and comprehensive income	$	1,577.8	$	1,491.9	$	1,548.2
Other comprehensive income (loss) net of tax:
—Decrease (increase) in pension and other post-retirement benefits (net of income tax of $(1.9), $3.7 and $2.1, respectively)		1.7		(7.7)		(2.9)
—Foreign currency translation adjustments		—		—		—
Total other comprehensive income (loss)		1.7		(7.7)		(2.9)
Total comprehensive income		1,579.5		1,484.2		1,545.3
Comprehensive income attributable to the non-controlling interest		7.4		6.1		5.2
Comprehensive income attributable to SCC	$	1,572.1	$	1,478.1	$	1,540.1

The accompanying notes are an integral part of these consolidated financial statements.

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and Subsidiaries

CONSOLIDATED BALANCE SHEETS

	December 31,		December 31,
	2020		2019
	(in millions)
ASSETS
Current assets:
Cash and cash equivalents	$	2,183.6	$	1,925.1
Short-term investments		410.8		80.7
Accounts receivable trade		1,068.9		832.9
Accounts receivable other (including related parties 2020- $23.3 and 2019 - $30.0)		67.7		78.9
Inventories		950.2		1,068.5
Prepaid taxes		104.8		172.4
Other current assets		29.2		26.2
Total current assets		4,815.2		4,184.7
Property and mine development, net		9,458.7		9,371.0
Ore stockpiles on leach pads		1,125.0		1,230.3
Intangible assets, net		143.0		148.4
Related parties receivable		—		59.5
Right-of-use assets		979.0		1,046.4
Deferred income tax		230.0		183.9
Equity method investment		114.3		111.9
Other non-current assets		81.3		71.3
Total assets	$	16,946.5	$	16,407.4
LIABILITIES
Current liabilities:
Current portion of long-term debt	$	—	$	399.8
Accounts payable (including related parties 2020- $104.3 and 2019- $86.4)		594.6		598.3
Accrued income taxes		340.9		116.3
Accrued workers’ participation		247.8		174.9
Accrued interest		98.6		96.0
Lease liabilities current		70.6		68.6
Other accrued liabilities		32.3		22.6
Total current liabilities		1,384.8		1,476.5
Long-term debt, net of current portion		6,544.2		6,541.0
Lease liabilities		908.4		977.8
Deferred income taxes		159.4		178.3
Non-current taxes payable		—		0.7
Other liabilities and reserves		128.7		112.6
Asset retirement obligation		545.0		262.3
Total non-current liabilities		8,285.7		8,072.7
Commitments and contingencies (Note 13)
STOCKHOLDERS’ EQUITY (NOTE 14)
Common stock par value $0.01; shares authorized, 2020 and 2019–2,000; shares issued, 2020 and 2019–884.6		8.8		8.8
Additional paid-in capital		3,441.5		3,424.9
Retained earnings		6,846.4		6,435.6
Accumulated other comprehensive income		(8.4)		(10.1)
Treasury stock, at cost, common shares		(3,063.5)		(3,048.9)
Total Southern Copper Corporation stockholders’ equity		7,224.8		6,810.3
Non-controlling interest		51.2		47.9
Total equity		7,276.0		6,858.2
Total liabilities and equity	$	16,946.5	$	16,407.4

The accompanying notes are an integral part of these consolidated financial statements.

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Southern Copper Corporation

and Subsidiaries

CONSOLIDATED STATEMENTS OF CASH FLOWS

	2020		2019		2018
OPERATING ACTIVITIES
Net income	$	1,577.8	$	1,491.9	$	1,548.2
Adjustments to reconcile net earnings to net cash provided from operating activities:
Depreciation, amortization and depletion		775.6		764.4		674.3
Equity earnings of affiliate, net of dividends received		(10.4)		(6.3)		(3.9)
Loss on foreign currency transaction effect		0.9		17.9		17.3
Benefit for deferred income taxes		(63.5)		(21.0)		(51.5)
Other, net		19.5		12.0		27.0
Change in operating assets and liabilities:
(Increase) decrease in accounts receivable		(236.0)		(10.5)		68.3
Decrease (increase) in inventories		223.6		(88.7)		(190.8)
Increase (decrease) in accounts payable and accrued liabilities		313.8		(184.9)		117.8
Decrease (increase) in other operating assets and liabilities		182.3		(62.9)		28.4
Net cash provided by operating activities		2,783.6		1,911.9		2,235.1
INVESTING ACTIVITIES
Capital expenditures		(592.2)		(707.5)		(1,121.4)
Purchase of short-term investments		(450.3)		(284.4)		(310.6)
Proceeds on sale of short-term investment		120.2		417.5		147.3
Other, net		6.5		0.4		(11.5)
Net cash used in investing activities		(915.8)		(574.0)		(1,296.2)
FINANCING ACTIVITIES
Repayments of debt		(400.0)		—		—
Proceeds from issuance of debt		—		987.3		—
Capitalization of debt issuance cost		—		(9.8)		—
Cash dividends paid to common stockholders		(1,159.6)		(1,236.9)		(1,082.3)
SCC shareholder derivative lawsuit — received from AMC		—		36.5		—
SCC shareholder derivative lawsuit — dividend paid		—		(36.5)		—
Distributions to non-controlling interest		(4.1)		(3.2)		(1.5)
Other, net		0.4		0.4		0.4
Net cash used in financing activities		(1,563.3)		(262.2)		(1,083.4)
Effect of exchange rate changes on cash and cash equivalents		(46.0)		4.8		(15.7)
Increase (decrease) in cash and cash equivalents		258.5		1,080.5		(160.2)
Cash and cash equivalents, at beginning of year		1,925.1		844.6		1,004.8
Cash and cash equivalents, at end of year	$	2,183.6	$	1,925.1	$	844.6

	2020		2019		2018
	(in millions)
Supplemental disclosure of cash flow information:
Cash paid during the year for:
Interest	$	383.5	$	356.7	$	356.7
Income taxes	$	1,037.1	$	1,138.7	$	1,155.3
Workers’ participation	$	153.9	$	224.5	$	194.0
Supplemental schedule of non-cash operating, investing and financing activities:
Decrease (increase) in pension and other post-retirement benefits	$	1.7	$	(7.7)	$	(2.9)
Capital expenditures incurred but not yet paid	$	32.2	$	2.1	$	37.7

The accompanying notes are an integral part of these consolidated financial statements.

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and Subsidiaries

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

(in millions)	2020		2019		2018
TOTAL EQUITY, beginning of year	$	6,858.2	$	6,612.8	$	6,149.4
STOCKHOLDERS’ EQUITY, beginning of year		6,810.3		6,567.4		6,107.7
CAPITAL STOCK:
Balance at beginning and end of year:		8.8		8.8		8.8
ADDITIONAL PAID-IN CAPITAL:
Balance at beginning of year		3,424.9		3,393.7		3,373.3
Other activity of the period		16.6		31.2		20.4
Balance at end of year		3,441.5		3,424.9		3,393.7
TREASURY STOCK:
Southern Copper common shares
Balance at beginning of the year		(2,767.9)		(2,768.3)		(2,768.7)
Used for corporate purposes		0.4		0.4		0.4
Balance at end of year		(2,767.5)		(2,767.9)		(2,768.3)
Parent Company common shares
Balance at beginning of year		(281.0)		(251.3)		(232.4)
Other activity, including dividend, interest and foreign currency transaction effect		(15.0)		(29.7)		(18.9)
Balance at end of year		(296.0)		(281.0)		(251.3)
Treasury stock balance at end of year		(3,063.5)		(3,048.9)		(3,019.6)
RETAINED EARNINGS:
Balance at beginning of year		6,435.6		6,186.9		5,726.2
Net earnings		1,570.4		1,485.8		1,543.0
Dividends declared and paid, common stock, per share, 2020- $1.50, 2019– $1.60, 2018 - $1.40		(1,159.6)		(1,236.9)		(1,082.3)
SCC shareholder derivative lawsuit — received from AMC		—		36.5		—
SCC shareholder derivative lawsuit — dividend paid		—		(36.5)		—
Other activity of the period		—		(0.2)		—
Balance at end of year		6,846.4		6,435.6		6,186.9
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS):
Balance at beginning of year		(10.1)		(2.4)		0.5
Other comprehensive income (loss)		1.7		(7.7)		(2.9)
Balance at end of year		(8.4)		(10.1)		(2.4)
STOCKHOLDERS’ EQUITY, end of year		7,224.8		6,810.3		6,567.4
NON-CONTROLLING INTEREST, beginning of year		47.9		45.4		41.7
Net earnings		7.4		6.1		5.2
Distributions paid		(4.1)		(3.6)		(1.5)
NON-CONTROLLING INTEREST, end of year		51.2		47.9		45.4
TOTAL EQUITY, end of year	$	7,276.0	$	6,858.2	$	6,612.8

The accompanying notes are an integral part of these consolidated financial statements.

108

SOUTHERN COPPER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1—DESCRIPTION OF THE BUSINESS:

The Company is a majority-owned, indirect subsidiary of Grupo Mexico S.A.B. de C.V. (“Grupo Mexico”). At December 31, 2020, Grupo Mexico through its wholly-owned subsidiary Americas Mining Corporation (“AMC”) owned 88.9% of the Company’s capital stock. The consolidated financial statements presented herein consist of the accounts of Southern Copper Corporation ("SCC", "Southern Copper" or the “Company”), a Delaware corporation, and its subsidiaries. The Company is an integrated producer of copper and other minerals, and operates mining, smelting and refining facilities in Peru and Mexico. The Company conducts its primary operations in Peru through a registered branch (the "Peruvian Branch" or “Branch” or “SPCC Peru Branch”). The Peruvian Branch is not a corporation separate from the Company. The Company's Mexican operations are conducted through subsidiaries. The Company also conducts exploration activities in Argentina, Chile, Ecuador, Mexico and Peru.

COVID – 19 PANDEMIC

Since the World Health Organization (“WHO”) declared the COVID-19 virus outbreak as a global pandemic, all the countries where the Company operates and conducts exploration activities, as well as the countries where its main customers and suppliers are located, have published health and safety rules and restrictions on individuals and business activities.

As of December 31, 2020, the Company‘s production facilities in Mexico and Peru were working at approximately 98% of their production capacity. The Company has developed a rigorous COVID-19 emergency protocol.

The Company has restarted exploration activities at all of its locations, except in Chile due to local restrictions. The Company restarted exploration activities in Ecuador and Argentina in September 2020 and at the end of the second quarter of 2020, respectively.

The financial reporting process and the information required to prepare the Company’s financial statements suffered no interruption and the financial statements were prepared without restrictions or difficulties.

SCC´s Corporate Crisis Committee as well as its Crisis Committees in Mexico and Peru continue to closely monitor the impact of the pandemic and to analyze and quickly resolve any issues that may arise. As of December 31, 2020, there were no major delays in the supply of materials and services critical for the operations and sales. Also, shipments and collections have registered no known major delays.

After completing the first stage of its capital programs at Buenavista in Mexico and Toquepala in Peru, the Company currently does not have major capital expenditures commitments (see Note 13 - Commitments and Contingencies). The Company paid the first tranche of its 2010 bonds of $400 million on April 15, 2020. The Company has no other major debt maturity until 2022.

The Company performed a qualitative analysis and as of December 31, 2020 identified no indicators of impairment. As the Company reported, the results of its impairment sensitivity analysis showed projected discounted cash flows in excess of the carrying amounts of long-lived assets by margins ranging from 1.3 to 4.3 times such carrying amount. This analysis included a stress test using a copper price assumption of $2.00 per pound and a molybdenum price assumption of $4.00 per pound.

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SOUTHERN COPPER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 2—SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

Principles of consolidation—

The consolidated financial statements include the accounts of subsidiaries of which the Company has voting control, in accordance with Accounting Standards Codification (“ASC”) 810 Consolidation. Such financial statements are prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP").

Use of estimates—

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include the carrying value of ore reserves that are the basis for future cash flow estimates and amortization calculations; environmental reclamation, closure and retirement obligations; estimates of recoverable copper in mill and leach stockpiles; asset impairments (including estimates of future cash flows); unrecognized tax benefits; valuation allowances for deferred tax assets; and fair value of financial instruments. Management bases its estimates on the Company's historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Actual results could differ from those estimates.

Revenue recognition—

The Company accounts for a contract with a customer when there is a legally enforceable contract between the Company and the customer, the rights of the parties are identified, the contract has commercial substance, and collectability of the contract consideration is probable. The Company's revenues are measured based on consideration specified in the contract with each customer. Disclosures regarding disaggregation of revenues and contract balances are disclosed within Note 18 "Segment and related information".

The Company’s marketing strategy and annual sales planning emphasize developing and maintaining long-term customer relationships. Generally, 80% to 90% of the Company’s metal production is sold under annual or longer-term contracts, which specify a volume of mineral to be sold over a stated period and delivery schedule; the price at which mineral will be sold at each delivery date is generally determined by the weekly or monthly average rate of the commodity published by major metal exchanges at specific dates stipulated within each contract. The Company considers each contract to be a single performance obligation, represented by the delivery of a series of distinct goods that are substantially the same, with the same pattern of transfer to the Company’s customers. The Company concluded this as, based on the nature of its contracts, customers receive the benefit of mineral sold as it is shipped per the terms of the contracts at each contractual delivery date. Likewise, each shipment of product represents the same measure of progress as other shipments within the contract. Accordingly, the Company recognizes revenues for each contract over the period of time in which the specified quantity of mineral is delivered. In doing so, the Company considers that it has a right to consideration from its customers in an amount that corresponds directly to the value transferred to those customers that being the quantity of mineral delivered at the price per unit delivered. Accordingly, the Company recognizes revenue at the amount to which it has the right to invoice (the invoice practical expedient), as it believes that this method is a faithful depiction of the transfer of goods to its customers.

For contracts with a term greater than one year, the Company is unable to disclose an allocation of the transaction price to the remaining unsatisfied performance obligation, given that unit prices of mineral sold are determined by published commodity prices at specified dates within the contract. The volume of mineral to be delivered after the first year of the contract is subject to annual volume negotiations in accordance with the terms of the contract. As of December 31, 2020, the Company has long-term contracts with promises to deliver in 2021 for a total of 208,000 metric tons of copper concentrate, 48,000 metric tons of copper cathodes, 43,329 tons of molybdenum concentrate and 325,700 tons of sulfuric

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SOUTHERN COPPER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

acid. This is an estimate that will vary in 2022 and 2023 based on the negotiations with the customers as mentioned above.

The remainder of the Company’s revenues, including its by-product revenues, are generated by spot sales that are recognized at a point in time.

Under both sales models, revenue is recognized when or as the performance obligations are satisfied, when the Company transfers control of the goods and title passes to the customer. Considering the International Commercial Terms (Incoterms) utilized by the Company, control is transferred generally upon the completion of loading the material at the point of origin. This is the point at which the customer obtains legal title to the product as well as the ability to direct the use of and obtain substantially all of the remaining benefits of ownership of the asset. Additionally, payment is generally due upon the delivery of the shipping and title documents at the point of origin, customers typically have 30 days to remit payment. Copper and non-copper revenues are measured based on the monthly average of prevailing commodity prices according to the terms of the contracts. The Company provides allowances for doubtful accounts based upon historical bad debt and claims experience and periodic evaluation of specific customer accounts.

Substantially all of the Company’s sales are made under carriage and insurance paid to, or cost, insurance and freight Incoterms, whereby the Company is responsible for providing shipping and insurance after control of the inventory has been transferred to the customer. According to the terms of the Company’s contracts, these services are not distinct within the context of the contract, and they are not separately identifiable from the other promises within the contract. Additionally, it is the Company policy and it has a long-standing history of providing shipping and insurance services to its customers. Accordingly, shipping and insurance are not considered separate performance obligations. The related costs of shipping and insurance are presented within the cost of sales line in the accompanying consolidated statements of income.

Furthermore, the Company considered the impact of the shipping and insurance services on the determination of when control is transferred to its customers. It has concluded that the terms of these services do not impact its customers’ ability to sell, pledge, or otherwise use the products in shipment. Also, there is a small likelihood and minimal history of lost or damaged goods during shipment. Considering these factors, combined with the other indicators of control previously mentioned, the Company has concluded that these services do not impact the determination that control is transferred at the point of origin.

For certain of the Company’s sales of copper and molybdenum products, customer contracts allow for pricing based on a month subsequent to shipping, in most cases within the following three months and occasionally in some cases a few additional months. In such cases, revenue is recorded at a provisional price at the time of shipment. The provisionally priced copper sales are adjusted to reflect forward LME or COMEX copper prices at the end of each month until a final adjustment is made to the price of the shipments upon settlement with customers pursuant to the terms of the contract. In the case of molybdenum sales, for which there are no published forward prices, the provisionally priced sales are adjusted to reflect the market prices at the end of each month until a final adjustment is made to the price of the shipments upon settlement with customers pursuant to the terms of the contract.

These provisional pricing arrangements are accounted for separately from the contract as an embedded derivative instrument under ASC 815-30 “Derivatives and Hedging—Cash Flow Hedges.” The Company sells copper in concentrate, anode, blister and refined form at industry standard commercial terms. Net sales include the invoiced value of copper, zinc, silver, molybdenum, sulfuric acid and other metals and the corresponding fair value adjustment of the related forward contract of copper and molybdenum. Disclosure regarding adjustments to sales for provisionally priced contracts is disclosed within Note 18 “Segment and related information”.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Cash and cash equivalents—

Cash and cash equivalents include bank deposits, certificates of deposit and short-term investment funds with original maturities of three months or less at the date of purchase. The carrying value of cash and cash equivalents approximates fair value.

Short-term investments—

The Company accounts for short-term investments in accordance with ASC 320-10 “Investments Debt and Equity Securities-Recognition.” The Company determines the appropriate classification of all short-term investments as held-to-maturity, available-for-sale or trading at the time of purchase and re-evaluates such classifications as of each balance sheet date. Unrealized gains and losses on available-for-sale investments, net of taxes, are reported as a component of accumulated other comprehensive income (loss) in stockholders’ equity, unless such loss is deemed to be other than temporary.

Inventories—

The Company principally produces copper and, in the production process, obtains several by-products, including molybdenum, silver, zinc, sulfuric acid and other metals.

Metal inventories, consisting of work-in-process and finished goods, are carried at the lower of average cost or net realizable value (NRV). Costs of work-in-process inventories and finished goods mainly include power, labor, fuel, operating and repair materials, depreciation, amortization, depletion, and other necessary costs related to the extraction and processing of ore, including mining, milling, concentrating, smelting, refining, leaching and chemical processing. Costs incurred in the production of metal inventories exclude general and administrative costs. Once molybdenum, silver, zinc and other by-products are identified, they are transferred to their respective production facilities and the incremental cost required to complete production is assigned to their inventory value.

Work-in-process inventories represent materials that are in the process of being converted into a saleable product. Conversion processes vary depending on the nature of the copper ore and the specific mining operation. For sulfide ores, processing includes milling and concentrating and results in the production of copper and molybdenum concentrates.

Finished goods include saleable products (e.g., copper concentrates, copper anodes, copper cathodes, copper rod, molybdenum concentrate and other metallurgical products).

Supplies inventories are carried at the lower of average cost or net realizable value (NRV).

Long-term inventory-Ore stockpiles on leach pads.

The leaching process is an integral part of the mining operations carried out at the Company’s open-pit mines. The Company capitalizes the production cost of leachable material at its Toquepala, La Caridad and Buenavista mines, recognizing it as inventory. This cost includes mining and haulage costs incurred to deliver ore to leach pads, depreciation, amortization, depletion and site overhead costs. The estimates of recoverable mineral content contained in the leaching dumps are supported by engineering studies. As the production cycle of the leaching process is significantly longer than the conventional process of concentrating, smelting and electrolytic refining, the Company includes current leach inventory (included in work-in-process inventories) and long-term leach inventory on its balance sheet. On January 1, 2020, the Company aligned its capitalization method for its Peruvian and Mexican operations to capitalize based on the allocation of copper content recoverable between ore and leach material. In addition, inventory consumption is now valued at the average unit cost, instead of the declining percentages of recovery method used previously. As a result of

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

these changes, during 2020 the value of capitalized material decreased by $196.4 million and consumption decreased by $29.3 million when compared to the previous capitalization method.

Management has evaluated ASC 250-10 and considered appropriate guidance to conclude that the aforementioned classifies as a change in accounting estimate, and therefore should affect accounting books prospectively. Management believes that this new method will result in a more accurate valuation of this material.

Property—

Property is recorded at acquisition cost, net of accumulated depreciation and amortization. Cost includes major expenditures for improvements and replacements, which extend useful lives or increase capacity and interest costs associated with significant capital additions. Maintenance, repairs, normal development costs at existing mines and gains or losses on assets retired or sold are reflected in earnings as incurred.

Buildings and equipment are depreciated on the straight-line method over estimated lives from two to 50 years or the estimated life of the mine if shorter.

Mine development—

Mine development includes primarily the cost of acquiring land rights to an exploitable ore body, pre-production stripping costs at new mines that are commercially exploitable, costs associated with bringing new mineral properties into production, and removal of overburden to prepare unique and identifiable areas outside the current mining area for such future production. Mine development costs are amortized on a unit of production basis over the remaining life of the mines.

Diverse practices exist in the mining industry relative to the treatment of drilling and other related costs to delineate new ore reserves. The Company follows the practices outlined in the next two paragraphs in its treatment of drilling and related costs.

Drilling and other associated costs incurred in the Company's efforts to delineate new resources, whether near-mine or Greenfield are expensed as incurred. These costs are classified as mineral exploration costs. Once the Company determines through feasibility studies that proven and probable reserves exist and that the drilling and other associated costs embody a probable future benefit that involves a capacity, singly or in combination with other assets, to contribute directly or indirectly to future net cash inflow, then the costs are classified as mine development costs. These mine development costs incurred prospectively to develop the property are capitalized as incurred, until the commencement of production, and are amortized using the units of production method over estimated life of the ore body. During the production stage, drilling and other related costs incurred to maintain production are included in production cost in the period in which they are incurred.

Drilling and other related costs incurred in the Company’s efforts to delineate a major expansion of reserves at an existing production property are expensed as incurred. Once the Company determines through feasibility studies that proven and probable incremental reserves exist and that the drilling and other associated costs embody a probable future benefit that involves a capacity, singly or in combination with other assets, to contribute directly or indirectly to future net cash inflow, then the costs are classified as mine development costs. These incremental mine development costs are capitalized as incurred, until the commencement of production and amortized using the units of production method over the estimated life of the ore body. A major expansion of reserves is one that increases total reserves at a property by approximately 10% or more.

For the years ended December 31, 2020, 2019 and 2018, the Company did not capitalize any drilling and related costs.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Asset retirement obligations (reclamation and remediation costs)—

The fair value of a liability for asset retirement obligations is recognized in the period in which the liability is incurred. The liability is measured at fair value and is adjusted to its present value in subsequent periods as accretion expense is recorded. The corresponding asset retirement costs are capitalized as part of the carrying value of the related long-lived assets and depreciated over the asset's useful life.

Intangible assets—

Intangible assets include primarily the excess amount paid over the book value for investment shares, which are presented as mining concessions, and mining and engineering development studies. Intangible assets are carried at acquisition costs, net of accumulated amortization and are amortized principally on a unit of production basis over the estimated remaining life of the mines. Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable.

Debt issuance costs—

Debt issuance costs related to a recognized debt liability are presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with the treatment of a debt discount.

Ore reserves—

The Company periodically reevaluates estimates of its ore reserves, which represent the Company’s estimate as to the amount of unmined copper remaining in its existing mine locations that can be produced and sold at a profit. Such estimates are based on engineering evaluations derived from samples of drill holes and other openings, combined with assumptions about copper market prices and production costs at each of the respective mines.

The Company updates its estimate of ore reserves at the beginning of each year. In this calculation, the Company uses current metal prices which are defined as the average metal price over the preceding three years. The current price per pound of copper, as defined, was $2.816, $2.818 and $2.642 at the end of 2020, 2019 and 2018, respectively. The ore reserve estimates are used to determine the amortization of mine development and intangible assets.

Once the Company determines through feasibility studies that proven and probable reserves exist and that drilling and other associated costs embody a probable future benefit that involves a capacity, singly or in combination with other assets, to contribute directly or indirectly to future net cash inflow, then the costs are classified as mine development costs and the Company discloses the related ore reserves.

Exploration—

Tangible and intangible costs incurred in the search for mineral properties are charged against earnings when incurred.

Income taxes—

Provisions for income taxes are based on taxes payable or refundable for the current year and deferred taxes on temporary differences between the amount of taxable income and pretax financial income and between the tax bases of assets and liabilities and their reported amounts in the financial statements. Deferred tax assets and liabilities are included in the financial statements at currently enacted income tax rates applicable to the period in which the deferred tax assets and liabilities are expected to be realized and settled as prescribed in ASC 740 “Income taxes.” As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Deferred income tax assets are reduced by any benefits that, in the opinion of management, are more likely not to be realized.

The Company’s operations involve dealing with uncertainties and judgments in the application of complex tax regulations in multiple jurisdictions. The final taxes paid are dependent upon many factors, including negotiations with tax authorities in various jurisdictions and resolution of disputes arising from federal, state, and international tax audits. The Company recognizes potential liabilities and records tax liabilities for anticipated tax audit issues in the U.S. and other tax jurisdictions based on its estimate of whether, and the extent to which, additional taxes will be due. The Company follows the guidance of ASC 740 “Income taxes” to record these liabilities. (See Note 7 “Income taxes” of the consolidated financial statements for additional information). The Company adjusts these reserves in light of changing facts and circumstances; however, due to the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different from the Company’s current estimate of the tax liabilities. If its estimate of tax liabilities proves to be less than the ultimate assessment, an additional charge to expense would result. If payment of these amounts ultimately proves to be less than the recorded amounts, the reversal of the liabilities would result in tax benefits being recognized in the period when the Company determines the liabilities are no longer necessary.

The Company classifies income tax-related interest and penalties as income taxes in the financial statements, as well as interest and penalties, if any, related to unrecognized tax benefits.

Foreign exchange—

The Company’s functional currency is the U.S. dollar. As required by local law, both the Peruvian Branch and Minera Mexico maintain their books of accounts in Peruvian soles and Mexican pesos, respectively.

Foreign currency assets and liabilities are remeasured into U.S. dollars at current exchange rates, except for non-monetary items such as inventory, property, intangible assets and other assets which are remeasured at historical exchange rates. Revenues and expenses are generally translated at actual exchange rates in effect during the period, except for those items related to balance sheet amounts that are remeasured at historical exchange rates. Gains and losses from foreign currency remeasurement are included in earnings of the period.

Gains and (losses) resulting from foreign currency transactions are included in "Cost of sales (exclusive of depreciation, amortization and depletion)."

Asset impairments -

The Company evaluates long-term assets when events or changes in economic circumstances indicate that the carrying amount of such assets may not be recoverable. These evaluations are based on business plans that are prepared using a time horizon that is reflective of the Company’s expectations of metal prices over its business cycle. The Company is currently using a long-term average copper price and an average molybdenum price for impairment tests, reflective of what the Company believes is the lower level of the current price environment. The results of its impairment tests using these long-term copper and molybdenum prices show no impairment in the carrying value of their assets.

In recent years testing using assumptions for long-term average prices have resulted in stricter evaluation for impairment analysis than would the higher three year average prices for copper and molybdenum prices. Should this situation reverse in the future with three-year average prices below the long-term price assumption, the Company would assess the need to use the three-year average prices in its evaluations. The Company uses an estimate of the future undiscounted net cash flows of the related asset or asset group over the remaining life to measure whether the assets are recoverable and measures any impairment by reference to fair value.

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Other comprehensive income—

Comprehensive income represents changes in equity during a period, except those resulting from investments by owners and distributions to owners. During the fiscal years ended December 31, 2020, 2019 and 2018, the components of "other comprehensive income (loss)" were, the unrecognized gain (loss) on employee benefit obligations and foreign currency translation adjustments.

Business segments-

Company management views Southern Copper as having three reportable segments and manages it on the basis of these segments. The segments identified by the Company are: 1) the Peruvian operations, which include the two open-pit copper mines in Peru and the plants and services supporting such mines, 2) the Mexican open-pit copper mines, which include La Caridad and Buenavista mine complexes and their supporting facilities and 3) the Mexican underground mining operations, which include five underground mines that produce zinc, lead, copper, silver and gold, a coal mine and a zinc refinery. Please see Note 18 “Segments and Related Information.”

The Chief Operating Decision Maker of the Company focuses on operating income as measure of performance to evaluate different segments, and to make decisions to allocate resources to the reported segments. This is a common measure in the mining industry.

Leases -

The Company adopted FASB ASC 842, Leases, effective January 1, 2019. The Company determined if a contract is or contained a lease at its inception. The Company evaluated if a contract gave the right to obtain substantially all of the economic benefits from use of an identified asset and the right to direct the use of the asset, in order to determine if a contract contained a lease. All of the Company’s existing lease contracts are operating lease contracts. For these leases, the Company recognized right-of-use assets and the corresponding operating lease liabilities on its consolidated balance sheet. Right-of-use assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent an obligation by the Company to make lease payments which arise from the lease. Lease right-of-use assets and liabilities are recognized at the inception date based on the present value of lease payments over the lease term. As the Company’s lease contracts do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the inception date in order to determine the present value of lease payments. Lease expense for lease payments is recognized on a straight-line basis over the lease term, in the cost of sales and operating expenses. The Company elected the transition approach whereby it applied the new leases standard at the adoption date and recognized a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company elected the short-term lease recognition exemption (short-term lease practical expedient) by class of underlying asset (which results in off-balance-sheet accounting for the lease).

ADOPTION OF CREDIT LOSSES STANDARD

In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-13: “Financial Instruments – Credit Losses (Topic 326)”. This ASU was adopted on January 1, 2020. Prior to adopting this ASU, the Company applied an impairment methodology for accounts receivable arising from revenue transactions within the scope of ASC 606 that is consistent with the provision matrix model contemplated in the new standard. In addition, the new disclosure requirements do not apply to such trade receivables because the collection periods in all cases are less than one year. The Company’s accounts receivable from related parties under common control are excluded from the scope of this ASU. Accordingly, the adoption of this ASU did not have a material impact on the Company’s financial statements or related disclosures.

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NOTE 3—SHORT-TERM INVESTMENTS:

Short-term investments were as follows ($ in millions):

	At December 31,
	2020			2019
Trading securities	$	410.2		$	80.0
Weighted average interest rate		0.4	%		2.0	%
Available-for-sale	$	0.6		$	0.7
Weighted average interest rate		0.7	%		0.7	%
Total	$	410.8		$	80.7

Trading securities consist of bonds issued by public companies and are publicly traded. Each financial instrument is independent of the others. The Company has the intention to sell these bonds in the short-term.

Available-for-sale investments consist of securities issued by public companies. Each security is independent of the others and, as of December 31, 2020 and 2019, included corporate bonds and asset and mortgage backed obligations. As of December 31, 2020 and 2019, gross unrealized gains and losses on available-for-sale securities were not material.

Related to these investments the Company earned interest, which was recorded as interest income in the consolidated statement of earnings. Also the Company redeemed some of these securities and recognized gains (losses) due to changes in fair value, which were recorded as other income (expense) in the consolidated statement of earnings.

The following table summarizes the activity of these investments by category (in millions):

	Years ended
	December 31,
	2020		2019
Trading:
Interest earned	$	0.7	$	0.6
Unrealized gain (loss) at the end of the period	$	(*)	$	(*)
Available-for-sale:
Interest earned		(*)		(*)
Investment redeemed	$	0.1	$	—

(*)   Less than $0.1 million

At December 31, 2020 and 2019, contractual maturities of the available-for-sale debt securities are as follows (in millions):

	2020		2019
One year or less	$	—	$	—
Maturing after one year through five years		—		—
Maturing after five years through ten years		—		—
Due after 10 years		0.6		0.7
Total debt securities	$	0.6	$	0.7

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NOTE 4—INVENTORIES:

	At December 31,
(in millions)	2020		2019
Inventory, current:
Metals at average cost:
Finished goods	$	50.8	$	87.2
Work-in-process		248.9		259.7
Ore stockpiles on leach pads		298.5		358.4
Supplies at average cost		352.0		363.2
Total current inventory	$	950.2	$	1,068.5
Inventory, long-term:
Ore stockpiles on leach pads	$	1,125.0	$	1,230.3

Total leaching costs added as long-term inventory of ore stockpiles in leach pads amounted to $194.0 million, $469.0 million and $506.6 million in 2020, 2019 and 2018, respectively. Long-term leaching inventories recognized as cost of sales amounted to $359.1 million, $385.8 million and $299.4 million in 2020, 2019 and 2018, respectively.

NOTE 5—PROPERTY:

	At December 31,
(in millions)	2020		2019
Buildings and equipment	$	15,561.9	$	15,016.1
Construction in progress		1,481.6		1,294.8
Mine development		272.8		267.5
Mineral assets		83.2		83.2
Land, other than mineral		235.8		200.1
Total property		17,635.3		16,861.7
Accumulated depreciation, amortization and depletion		(8,176.6)		(7,490.7)
Total property and mine development, net	$	9,458.7	$	9,371.0

Depreciation and depletion expense for the years ended December 31, 2020, 2019 and 2018, amounted to $766.4 million, $759.9 million and $668.9 million, respectively.

NOTE 6—INTANGIBLE ASSETS:

	At December 31,
(in millions)	2020		2019
Mining concessions	$	121.2	$	121.2
Mine engineering and development studies		19.8		19.8
Software		60.6		55.9
		201.6		196.9
Accumulated amortization:
Mining concessions		(38.6)		(38.0)
Mine engineering and development studies		(17.2)		(16.3)
Software		(44.7)		(36.1)
		(100.5)		(90.4)
Goodwill		41.9		41.9
Intangible assets, net	$	143.0	$	148.4

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Amortization of intangibles for the years ended December 31, 2020, 2019 and 2018, amounted to $9.2 million, $4.5 million and $5.4 million, respectively. Estimated amortization is as follows:

Estimated amortization expense (in millions):
2021	$	7.7
2022		5.2
2023		5.2
2024		4.3
2025		3.0
Total 2021 - 2025	$	25.4
Average annual	$	5.1

Goodwill includes $17.0 million generated in 1997 as a result of purchasing a third party interest in the Buenavista mine. It also includes $24.9 million representing the amount of the purchase price in excess of the fair value of the net assets acquired from El Pilar mine. This goodwill is attributable to future benefits that the Company expects to realize from the mine and will not be deductible for income tax purposes.

NOTE 7—INCOME TAXES:

Since March 2009, Grupo Mexico, through its wholly-owned subsidiary AMC, owns an interest in excess of 80% of SCC. Accordingly, SCC’s results are included in the consolidated results of the Grupo Mexico subsidiary for U.S. federal income tax reporting. SCC provides current and deferred income taxes, as if it were filing a separate U.S. federal income tax return.

The introduction of the Global Intangible Low Tax Income or GILTI for tax years beginning in 2018 impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. For 2018-2020, there was no U.S. tax liability from the GILTI inclusion. The Company does not anticipate a tax on GILTI in the future because of increased fixed asset amounts and given the Mexican tax rate of 30%, no U.S. deferred taxes would be recorded. Accordingly, the Company has elected that if GILTI were to apply in the future, a current period expense would be recorded when incurred.

Also introduced with 2017 U.S tax reform and applicable to years 2018 and after is the Base Erosion Anti-Abuse Tax (BEAT). BEAT is a 5% minimum tax for tax year 2018, 10% for the years 2019 through 2025 and 12.5% in years thereafter. It is calculated on a base equal to the Company’s income determined without the tax benefit arising from base erosion payments. The Company did not incur a BEAT liability in 2018, 2019 and 2020 since it has met the safe harbor rule that provides a Company not to be subject to the BEAT if related party payments from the U.S. to foreign entities does not exceed 3% of expenses excluding cost of goods sold. The Company must continue to analyze applicability of the BEAT provisions on a yearly basis.

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The components of the provision for income taxes for the three years ended December 31, 2020, are as follows:

(in millions)	2020		2019		2018
U.S. federal and state:
Current	$	—	$	—	$	2.6
Deferred		—		—		(13.0)
Uncertain tax positions		—		(1.3)		—
		—		(1.3)		(10.4)
Foreign (Peru and Mexico):
Current		1,237.9		966.3		1,102.4
Deferred		(63.5)		(30.1)		(38.5)
Uncertain tax positions		—		10.4		—
		1,174.4		946.6		1,063.9
Total provision for income taxes	$	1,174.4	$	945.3	$	1,053.5

The source of income is as follows:

(in millions)	2020		2019		2018
Earnings by location:
U.S.	$	(15.3)	$	(1.9)	$	(2.3)
Foreign
Peru		723.9		513.0		441.8
Mexico		2,037.2		1,915.4		2,149.9
		2,761.1		2,428.4		2,591.7
Earnings before taxes on income	$	2,745.8	$	2,426.5	$	2,589.4

The reconciliation of the statutory income tax rate to the effective tax rate for the three years ended December 31, 2020, is as follows (in percentage points):

	2020		2019		2018
Expected tax at U.S. statutory rate	21.0	%	21.0	%	21.0	%
Foreign tax at other than statutory rate, net of foreign tax credit benefit (1)	13.7		14.0		13.9
Percentage depletion	(2.2)		(2.7)		(2.1)
Other permanent differences	0.1		0.1		0.4
Change in 2017 valuation allowance on U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred taxes	—		—		7.5
Additional valuation allowance on 2018 U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred taxes	8.9		10.1		1.0
Decrease in 2017 U.S. deferred tax asset due to tax rate changes	—		—		(0.2)
U.S. one time transition tax on accumulated foreign earnings	—		—		0.4
Increase (decrease) in unrecognized tax benefits for uncertain tax positions	(0.1)		(2.1)		—
Amounts (over) / under provided in prior years	(0.1)		(1.1)		(1.3)
Other	1.5		(0.3)		0.1
Effective income tax rate	42.8	%	39.0	%	40.7	%

(1) Foreign tax at other than statutory rates, net of foreign tax credit benefit, also includes the effects of permanent differences in Peru and Mexico, that are determined at the local statutory rate.

The Company files income tax returns in three jurisdictions, Peru, Mexico and the United States. For the three years presented above, the statutory income tax rate for Mexico was 30% and the United States tax rate was 21%. The Peruvian tax rate was 29.5% for the three years presented above. While the largest components of income taxes are the

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Peruvian and Mexican taxes, the Company is a domestic U.S. entity. Therefore, the rate used in the above reconciliation is the U.S. statutory rate.

For all of the years presented, both the Peruvian branch and Minera Mexico filed separate tax returns in their respective tax jurisdictions. Although the tax rules and regulations imposed in the separate tax jurisdictions may vary significantly, similar permanent items exist, such as items which are nondeductible or nontaxable. Some permanent differences relate specifically to SCC such as the allowance in the United States for percentage depletion.

Deferred taxes include the U.S., Peruvian and Mexican tax effects of the following types of temporary differences and carryforwards:

	At December 31,
(in millions)	2020		2019
Assets:
Inventories	$	62.4	$	55.7
Capitalized exploration expenses		13.0		14.0
U.S. foreign tax credit carryforward, net of FIN 48 liability		974.1		731.8
U.S. tax effect of Peruvian deferred tax liability		111.2		131.3
Provisions		169.5		145.0
Mexican tax on consolidated dividends		—		9.0
Deferred workers participation		37.8		24.7
Accrued salaries, wages and vacations		8.5		10.0
Sales price adjustment (PUI)		(5.8)		3.0
Social responsibility expenses		4.3		2.1
Deferred charges		41.8		14.5
Valuation allowance on U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred		(1,343.2)		(1,097.0)
Other		19.5		9.9
Total deferred tax assets		93.1		54.0
	At December 31,
(in millions)	2020		2019
Liabilities:
Property, plant and equipment		(17.2)		(45.4)
Other		(5.3)		(3.0)
Total deferred tax liabilities		(22.5)		(48.4)
Total net deferred tax (liabilities) / assets	$	70.6	$	5.6

The valuation allowance increased by $246.2 million over 2019’s level, which was primarily due to the valuation of unutilized Foreign Tax Credits generated in 2020 and the valuation of Foreign Tax Credits carried forward from prior years. The Peru branch operations are taxed in the U.S. as a flow through entity to SCC. Prior to 2017 U.S. Tax Reform, the U.S. corporate income tax rate was 35% on the Peru earnings, which enabled the company to use more currently generated foreign tax credits. Since tax reform reduced the U.S. tax rate to 21%, there is less U.S. income tax to absorb currently generated FTC’s or carryforwards. Additionally, allowable expenses in the U.S. for percentage depletion and U.S. sourced interest expense on debt reduced the branch income subject to U.S. tax, further limiting utilization of foreign tax credits.

U.S. Tax Matters—

As of December 31, 2020, the Company considers its ownership of the stock of Minera Mexico to be essentially permanent in duration.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

As of December 31, 2020, $1,297.3 million of the Company´s total cash, cash equivalents and short-term investments of $2,594.4 million were held by foreign subsidiaries. The cash, cash equivalents and short-term investments maintained in our foreign operations are generally used to cover local operating and investment expenses. The Company has determined that as of December 31, 2020, a deferred tax asset of $0.2 billion exists with respect to its investment in foreign subsidiaries. Tax accounting guidance provided in ASC 740 requires this asset to be recognized only if the basis difference will reverse in the foreseeable future. Management has no plans that would result in the reversal of this temporary difference and consequently no deferred tax asset has been recorded. Future dividends from these subsidiaries are no longer subject to federal income tax in the U.S., and the Company incurs no state income tax liability. Additionally, there are no withholding taxes due to the tax treaty between the United States and Mexico. Earnings from the Company’s Peruvian branch are not subject to transition taxes given that they are taxed in the United States on a current basis.

At December 31, 2020, there were $1,040.0 million of foreign tax credits available for carryback or carryforward. These credits have a one-year carryback and a ten-year carryforward period and can only be used to reduce U.S. income tax on foreign earnings. There were no other unused U.S. tax credits at December 31, 2020. These credits will expire if not utilized by the end of the years listed below:

Year	Amount
2023		39.4
2024		102.0
2025		189.5
2026		107.0
2027		—
2028		159.6
2029		204.9
2030		237.6
Total	$	1,040.0

These foreign tax credits are presented above on a gross basis and have not been reduced here for any unrecognized tax benefits. These foreign tax credits have been adjusted to include the 2016 Net Operating Loss carryback in the U.S. jurisdiction, increasing foreign tax credits by approximately $15.9 million. In accordance with ASC 740 the Company has recorded $66.1 million for an unrecognized tax benefit as an offset to the Company’s deferred tax asset for foreign tax credits. The remaining foreign tax credits of $973.9 million are being re-valued to zero at December 31, 2020. It is the opinion of management that with the reduction in the U.S. corporate tax rate to 21% and considering the corporate tax rates in Mexico of 30% and in Peru at 29.5%, it is unlikely the excess foreign tax credits can be utilized. Additionally, foreign dividends will no longer be taxed in the U.S., thereby reducing the U.S. tax on the foreign source income that the credits can be used to offset.

Peruvian Tax Matters—

Royalty mining charge: The royalty charge is based on operating income margins with graduated rates ranging from 1% to 12% of operating profits, with a minimum royalty charge assessed at 1% of net sales. The minimum royalty charge is recorded as cost of sales and those amounts assessed at higher rates are included in the income tax provision. The Company has accrued $60.6 million, $42.3 million and $32.9 million of royalty charges in 2020, 2019 and 2018, respectively, of which $31.4 million, $14.2 million and $9.0 million were included in income taxes in 2020, 2019 and 2018, respectively.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Peruvian special mining tax: This tax is based on operating income with graduated rates increasing from 2% to 8.4%. The Company recognized $50.0 million, $38.1 million and $30.6 million in 2020, 2019 and 2018, respectively, with respect to this tax. These amounts are included as “income taxes” in the consolidated statement of earnings.

Mexican Tax Matters—

In 2013, the Mexican Congress enacted tax law changes that became effective on January 1, 2014. Among other effects, the amounts that Minera Mexico recorded during 2019 and paid in 2020 were:

● Mining royalty at the rate of 7.5% on taxable earnings before taxes: $60.1 million.

● Additional royalty of 0.5% over gross income from sales of gold, silver and platinum: $0.9 million.

On December 09, 2019, the Federal Revenue Law for fiscal year 2020, was published in the Federal Official Gazette, effective as of January 1, 2020. The main tax matters are reported as follows:

Income tax changes - Interest expense limitation based on profit levels: The Reform would subject taxpayers with interest expenses over 20 million Mexican pesos to a net interest expense deduction limitation equal to 30% of “adjusted taxable income.” Nondeductible interest expense for each year could be carried forward for 10 years. “Adjusted taxable income” is defined as taxable income for the year, with an addback for interest deductions on debt, as well as deductions for fixed assets, deferred charges and expenses, and pre-operating expenses. The interest limitation is calculated based on net interest, which is determined as interest income less interest expense. If interest income is greater, there is no limitation. Interest paid to Mexican residents, as well as non-residents, is subject to the limitation, as is interest to related and unrelated parties.

Accounting for Uncertainty in Income Taxes—

The total amount of unrecognized tax benefits in 2020, 2019 and 2018, was as follows (in millions):

	2020		2019		2018
Unrecognized tax benefits, opening balance	$	58.4	$	214.5	$	214.5
Gross increases—tax positions in prior period		—		(7.5)		—
Gross increases—current-period tax positions		7.7		(4.2)		—
Decreases related to settlements with taxing authorities		—		(144.4)		—
		7.7		(156.1)		—
Unrecognized tax benefits, ending balance	$	66.1	$	58.4	$	214.5

The amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate was zero at December 31, 2020 for unrecognized tax benefits in the Peruvian jurisdiction. Any recognition of unrecognized tax benefits within the U.S. jurisdiction would not affect the effective tax rate as long as the Company continues to value U.S. deferred tax assets including foreign tax credits. The Company has no unrecognized Mexican tax benefits.

The Company’s U.S. IRS audit of 2014 -2016 commenced in 2019 and is expected to settle in the first half of 2021.

As of December 31, 2020, the Company’s liability for uncertain tax positions did not include accrued interest and penalties in the U.S. jurisdiction. As of December 31, 2019 and December 31, 2018 the Company’s liability for uncertain tax positions included Peruvian accrued interest and penalties of $10.5 and $1.9 million, respectively.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The following tax years remain open to examination and adjustment in the Company’s three major tax jurisdictions:

Peru:	2014 and all subsequent years
U.S.:	2014 and all subsequent years
Mexico:	2015 and all subsequent years

Management does not expect that any of the open years will result in a cash payment within the U.S. jurisdiction in the upcoming twelve months ending December 31, 2021. Additionally, the Company expects that $0.6 million in cash payments in the Peruvian jurisdiction will be paid within the upcoming twelve months ending December 31, 2021. The Company’s reasonable expectations about future resolutions of uncertain items did not materially change during the year ended December 31, 2020.

NOTE 8—WORKERS’ PARTICIPATION:

The Company's operations in Peru and Mexico are subject to statutory workers' participation.

In Peru, the provision for workers' participation is calculated at 8% of pre-tax earnings. The current portion of this participation, which is accrued during the year, is based on the Peruvian Branch's taxable income and is distributed to workers following determination of final results for the year. The annual amount payable to an individual worker is capped at the worker’s salary for an 18 month period. Amounts determined in excess of the 18 months of worker’s salary is no longer made as a payment to the worker and is levied first for the benefit of the “Fondo Nacional de Capacitacion Laboral y de Promocion del Empleo” (National Workers’ Training and Employment Promotion Fund) until this entity receives from all employers in its region an amount equivalent to 2,200 Peruvian taxable units (approximately $2.6 million in 2020). Any remaining excess is levied as payment for the benefit of the regional governments. These levies fund worker training, employment promotion, entrepreneurship and various other programs.

In Mexico, workers' participation is determined using the guidelines established in the Mexican income tax law at a rate of 10% of pre-tax earnings as adjusted by the tax law.

The provision for workers’ participation is allocated to “Cost of sales (exclusive of depreciation, amortization and depletion)” and to “selling, general and administrative” in the consolidated statement of earnings, proportional to the number of workers in the production and administrative areas, respectively. Workers’ participation expense for the three years ended December 31, 2020 was as follows (in millions):

	2020		2019		2018
Current	$	248.5	$	188.8	$	219.9
Deferred		19.8		29.8		9.8
	$	268.3	$	218.6	$	229.7

NOTE 9—LEASES:

The Company has operating leases for power generating facilities, vehicles and properties. The Company recognizes lease expense for these leases on a straight-line basis over the lease term. Some of the Company’s leases include both lease and non-lease components which are accounted for separately. The Company’s leases have remaining lease terms of two years to 13 years, and do not include options to extend the leases. The Company’s lease agreements do not contain options to purchase the leased assets or to terminate the leases before the expiration date. In addition, the Company’s lease contracts do not have any material residual value guarantees or material restrictive covenants. As none of the Company’s leases provides an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The weighted average remaining lease term for the Company’s leases is 9 years, and the weighted average discount rate for these leases is 3.71%.

The operating lease expense recognized in the years ended December 31, 2020 and 2019 was classified as follows (in millions):

Classification	2020		2019
Cost of sales (exclusive of depreciation, amortization and depletion)	$	114.4	$	114.4
Selling, general and administrative		0.2		0.2
Exploration		0.2		0.2
Total lease expense	$	114.8	$	114.8

The Company’s short-term lease costs for the year ended December 31, 2020 were $0.1 million.

Maturities of lease liabilities are as follows:

	Lease liabilities
Year	(in millions)
2021	$	114.7
2022		113.7
2023		112.3
2024		104.7
2025		103.7
After 2025		723.0
Total lease payments	$	1,272.1
Less: interest on lease liabilities		(293.1)
Present value of lease payments	$	979.0

NOTE 10—ASSET RETIREMENT OBLIGATION:

Peruvian operations:

The Company maintains an asset retirement obligation for its mining properties in Peru, as required by the Peruvian Mine Closure Law. In accordance with the requirements of this law the Company’s closure plans were approved by the Peruvian Ministry of Energy and Mines (“MINEM”). As part of the closure plans, the Company is required to provide annual guarantees over the estimated life of the mines, based on a present value approach, and to furnish the funds for the asset retirement obligation. This law requires a review of closing plans every five years.

On June 24, 2019, MINEM approved a change to the guarantees required for the mining closure plans. The new regulation specifies that the annual guarantees can be secured with real estate up to a maximum of 50% and the remaining amount with credit instruments. Currently, the Company has pledged the value of its Lima office complex for the 50% of the guarantee and with a stand-by letter of credit for the other 50% as security for this obligation. Through January 2021, the Company provided total guarantees of $56.5 million.

The closure cost recognized for this liability includes the cost, as outlined in its closure plans, of dismantling the Toquepala and Cuajone concentrators, the Ilo smelter and refinery, and the shops and auxiliary facilities at the three units. In March 2016, MINEM approved the Mining Closure Plan for the Toquepala expansion project and the revised closure plans for the Cuajone mine and the Ilo facilities were approved in January and October 2019, respectively. As result of these new estimates, the Company increased the asset retirement obligation by $28.1 million in 2019. The closure plan for the Tia Maria project was approved in February 2017. The Company, however, has not recorded a

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retirement obligation for the project because the work on the project is on hold. The Company believes that under these circumstances the recording of a retirement obligation is not appropriate.

Mexican operations:

The Company has recognized an estimated asset retirement obligation for its mining properties in Mexico as part of its environmental commitment. Even though there is currently no enacted law, statute, ordinance, written or oral contract requiring the Company to carry out mine closure and environmental remediation activities, the Company believes that an obligation presently exists based on historical government requirements for the closure of any facility. The overall cost recognized for mining closure in Mexico includes the estimated costs of dismantling concentrators, smelter and refinery plants, shops and other facilities.

During 2020, the Company made a change in the estimate for the asset retirement obligation for its Mexican operations, mainly due to a detailed review of the closing activities required for each facility. The effect of this change was an increase in the asset retirement obligation of $269.3 million, which was recorded in December 2020.

The following table summarizes the asset retirement obligation activity for the years ended December 31, 2020 and 2019 (in millions):

	2020		2019
Balance as of January 1	$	262.3	$	217.7
Changes in estimates		269.3		36.4
Closure payments		(1.2)		(5.3)
Accretion expense		14.6		13.5
Balance as of December 31,	$	545.0	$	262.3

NOTE 11—FINANCING:

Long-term debt (in millions):

							Carrying
							value as of
	Face		Issuance		Issuance		December 31,
	amount		discount		costs		2020
3.500% Senior unsecured notes due 2022	$	300		(0.2)	$	(0.3)	$	299.5
3.875% Senior unsecured notes due 2025		500		(1.3)		(1.2)		497.5
9.250% Yankee bonds due 2028		51.2		—		—		51.2
7.500% Senior unsecured notes due 2035		1,000		(12.0)		(8.0)		980.0
6.750% Senior unsecured notes due 2040		1,100		(6.9)		(5.6)		1,087.5
5.250% Senior unsecured notes due 2042		1,200		(18.6)		(6.2)		1,175.2
5.875% Senior unsecured notes due 2045		1,500		(16.1)		(8.5)		1,475.4
4.500% Minera Mexico Senior unsecured notes due 2050		1,000		(12.5)		(9.6)		977.9
Total	$	6,651.2	$	(67.6)	$	(39.4)		6,544.2
Less, current portion								—
Total long-term debt							$	6,544.2

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							Carrying
							value as of
	Face		Issuance		Issuance		December 31,
	amount		discount		costs		2019
5.375% Senior unsecured notes due 2020	$	400		(0.1)	$	(0.1)	$	399.8
3.500% Senior unsecured notes due 2022		300		(0.3)		(0.5)		299.2
3.875% Senior unsecured notes due 2025		500		(1.6)		(1.5)		496.9
9.250% Yankee bonds due 2028		51		—		—		51.2
7.500% Senior unsecured notes due 2035		1,000		(12.4)		(8.3)		979.3
6.750% Senior unsecured notes due 2040		1,100		(7.1)		(5.7)		1,087.2
5.250% Senior unsecured notes due 2042		1,200		(19.0)		(6.3)		1,174.7
5.875% Senior unsecured notes due 2045		1,500		(16.4)		(8.6)		1,475.0
4.500% Minera Mexico Senior unsecured notes due 2050		1,000		(12.7)		(9.8)		977.5
Total	$	7,051	$	(69.6)	$	(40.8)		6,940.8
Less, current portion								(399.8)
Total long-term debt							$	6,541.0

The bonds, referred above as “Yankee bonds”, contain a covenant requiring Minera Mexico to maintain a ratio of EBITDA to interest expense of not less than 2.5 to 1.0 as such terms are defined in the debt instrument. At December 31, 2020, Minera Mexico was in compliance with this covenant.

Between July 2005 and November 2012 the Company issued senior unsecured notes six times totaling $4.2 billion, as listed above. Interest on the notes is paid semi-annually in arrears. The notes rank pari passu with each other and rank pari passu in right of payment with all of the Company’s other existing and future unsecured and unsubordinated indebtedness. On April 20, 2015, the Company issued $2.0 billion of fixed-rate senior unsecured notes. This debt was issued in two tranches, $500 million due 2025 at an annual interest rate of 3.875% and $1.5 billion due 2045 at an annual interest rate of 5.875%. These notes are general unsecured obligations of the Company and rank equally with all of its existing and future unsecured and unsubordinated debt. Net proceeds are being used for general corporate purposes, including the financing of the Company´s capital investment program. The notes were issued with an underwriters’ discount of $20.2 million. Additionally, issuance costs of $11.8 million associated with these notes were paid and deferred. The unamortized balance of the discount and the costs are presented net of the carrying value of the debt issued and are amortized as interest expense over the life of the loan.

The indentures relating to the notes contain certain restrictive covenants, including limitations on liens, limitations on sale and leaseback transactions, rights of the holders of the notes upon the occurrence of a change of control triggering event, limitations on subsidiary indebtedness and limitations on consolidations, mergers, sales or conveyances. Certain of these covenants cease to be applicable before the notes mature if the Company obtains an investment grade rating. The Company obtained investment grade rating in 2005. The Company has registered these notes under the Securities Act of 1933, as amended. The Company may issue additional debt from time to time pursuant to certain of the indentures.

If the Company experiences a “Change of Control Triggering Event”, the Company must offer to repurchase the notes at a purchase price equal to 101% of the principal amount thereof, plus accrued and unpaid interest, if any. A Change of Control Trigger Event means a Change of Control (as defined) and a rating decline (as defined), that is, if the rating of the notes, by at least one of the rating agencies shall be decreased by one or more gradations.

At December 31, 2020, the Company was in compliance with the covenants of the notes.

On September 26, 2019, SCC’s subsidiary Minera Mexico S.A. de C.V. issued $1.0 billion of fixed-rate senior notes with a discount of $12.7 million. Additionally, issuance costs of $9.8 million associated with these notes were paid and

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deferred. The unamortized balance of the discount and the costs are presented net of the carrying value of the debt issued and are amortized as interest expense over the life of the loan. This debt was issued in one tranche, due in 2050 at an annual interest rate of 4.5%. Interest on the notes is paid semi-annually in arrears. The Company intends to use the net proceeds from this offering (i) to finance Minera Mexico expansion program, including the Buenavista Zinc, Pilares and El Pilar projects, (ii) for other capital expenditures and (iii) for general corporate purposes.

The notes constitute general unsecured obligations of Minera Mexico. The notes were issued in an unregistered offering pursuant to Rule 144A and Regulation S under the Securities Act of 1933. The Company capitalized the costs associated with the issuance of this facility, which are included as part of the amortized cost of the long-term debt in the consolidated balance sheet.

In connection with the transaction, on September 26, 2019, Minera Mexico entered into an indenture with Wells Fargo Bank, National Association, as trustee, which provided for the issuance, and set forth the terms of the notes described above. The indenture contains covenants that limit Minera Mexico's ability to, among other things, incur certain liens securing indebtedness, engage in certain sale and leaseback transactions, and enter into certain consolidations, mergers, conveyances, transfers or leases of all or substantially all of Minera Mexico's assets.

Aggregate maturities of the outstanding borrowings at December 31, 2020, are as follows:

	Principal
Years	Due(*)
	(in millions)
2021	$	—
2022		300.0
2023		—
2024		—
2025		500.0
Thereafter		5,851.2
Total	$	6,651.2

(*)Total debt maturities do not include the debt discount valuation account of $107.0 million.

NOTE 12—BENEFIT PLANS:

Post retirement defined benefit plans and defined contribution plan

The Company has two noncontributory defined benefit pension plans covering former salaried employees in the United States and certain former expatriate employees in Peru (the “Expatriate Plan”). Effective October 31, 2000, the Board of Directors amended the qualified pension plan to suspend the accrual of benefits. In addition, the Company’s Mexican subsidiaries have a defined contribution pension plan for salaried employees and a non-contributory defined benefit pension plan for union employees (the “Mexican Plan”).

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The components of net periodic benefit costs calculated in accordance with ASC 715 “Compensation retirement benefits,” using December 31 as a measurement date, consist of the following:

(in millions)	2020		2019		2018
Service cost	$	1.4	$	1.1	$	1.0
Interest cost		1.7		1.8		1.6
Expected return on plan assets		(2.9)		(3.5)		(3.4)
Amortization of net actuarial loss		0.1		—		—
Amortization of prior service cost / (credit)		0.2		0.2		0.2
Settlement / Curtailment		(0.4)		—		(0.2)
Amortization of net loss/(gain)		0.2		0.3		0.2
Net periodic benefit cost	$	0.3	$	(0.1)	$	(0.6)

The change in benefit obligation and plan assets and a reconciliation of funded status are as follows:

	As of December 31,
(in millions)	2020		2019
Change in benefit obligation:
Projected benefit obligation at beginning of year	$	33.7	$	27.4
Service cost		1.4		1.1
Interest cost		1.7		1.8
Settlement		—		—
Benefits paid		(1.9)		(1.8)
Actuarial (gain)/loss		(4.2)		3.6
Actuarial gain assumption changes		0.8		0.9
Inflation adjustment		(1.6)		0.7
Projected benefit obligation at end of year	$	29.9	$	33.7
Change in plan assets:
Fair value of plan assets at beginning of year	$	51.6	$	46.7
Actual return on plan assets		6.5		4.8
Employer contributions		(0.6)		(0.6)
Benefits paid		(0.9)		(0.9)
Currency exchange rate adjustment		(2.2)		1.6
Fair value of plan assets at end of year	$	54.4	$	51.6
Funded status at end of year:	$	24.5	$	17.9
ASC-715 amounts recognized in statement of financial position consists of:
Non-current assets	$	24.5	$	17.9
Total	$	24.5	$	17.9
ASC-715 amounts recognized in accumulated other comprehensive income (net of income taxes of $(2.3) million and $(5.4) million in 2020 and 2019, respectively) consists of:
Net loss (gain)	$	3.0	$	7.6
Prior service cost		1.2		1.4
Total	$	4.2	$	9.0

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The following table summarizes the changes in accumulated other comprehensive income for the years ended December 31, related to the defined benefit pension plan, net of income tax:

(in millions)	2020		2019
Reconciliation of accumulated other comprehensive income:
Accumulated other comprehensive income at beginning of plan year	$	9.0	$	7.2
Net loss/(gain) amortized during the year		(4.1)		1.9
Net loss/(gain) occurring during the year		(0.3)		(0.2)
Prior service cost (credit)		—		—
Currency exchange rate adjustment		(0.4)		0.1
Net adjustment to accumulated other comprehensive income (net of income taxes of $3.1 million and $(2.2) million in 2020 and 2019, respectively)		(4.8)		1.8
Accumulated other comprehensive income at end of plan year	$	4.2	$	9.0

The following table summarizes the amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost in 2020 and 2019, net of income tax:

(in millions)	2020		2019
Net loss / (gain)	$	(4.1)	$	1.8
Amortization of net (loss) gain		(0.3)		(0.2)
Amortization of prior services cost (credit)		—		—
Total amortization expenses	$	(4.4)	$	1.6

The assumptions used to determine the pension obligations are:

Expatriate Plan	2020		2019		2018
Discount rate	1.90	%	2.85	%	3.90	%
Expected long-term rate of return on plan asset	3.50	%	4.00	%	4.00	%
Rate of increase in future compensation level	N/A		N/A		N/A

Mexican Plan(*)	2020		2019		2018
Discount rate	7.43	%	7.15	%	8.45	%
Expected long-term rate of return on plan asset	7.43	%	7.15	%	8.45	%
Rate of increase in future compensation level	4.50	%	4.50	%	4.50	%

(*)These rates are based on Mexican pesos as pension obligations are denominated in this currency.

The scheduled maturities of the benefits expected to be paid in each of the next five years, and thereafter, are as follows:

	Expected
Years	Benefit Payments
	(in millions)
2021	$	3.1
2022		1.7
2023		1.8
2024		2.0
2025		1.8
2026 to 2028		12.5
Total	$	22.9

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Expatriate Plan

The Company’s funding policy is to contribute amounts to the qualified plan sufficient to meet the minimum funding requirements set forth in the Employee Retirement Income Security Act of 1974 plus such additional amounts as the Company may determine to be appropriate.

Plan assets are invested in a group annuity contract with Metropolitan Life Insurance Company (“MetLife”). The Contract invests in the MetLife General Account Payment Fund (the "General Account") and the MetLife Broad Market Core Bond Fund (the “Bond Fund”) managed by BlackRock, Inc.

The General Account is broadly diversified across asset classes and backed by the total capital of MetLife.

The Bond Fund seeks to outperform the Bloomberg Barclays ® U.S. Aggregate Bond Index, net of fees, over a full market cycle. The Bond Fund invests in publicly traded, investment grade securities. These may include corporate securities, mortgage securities, treasuries and cash, agency securities, commercial mortgage backed securities and other investment vehicles adhering to the fund’s investment objectives. These investments are classified as Level 1 because they are valued using quoted prices of the same securities as they consist of instruments which are publicly traded.

Plan assets are invested with the objective of maximizing returns with an acceptable level of risk and maintaining adequate liquidity to fund expected benefit payments. The Company's policy for determining asset mix-targets to meet investment objectives includes periodic consultation with recognized third-party investment consultants.

The expected long-term rate of return on plan assets is reviewed annually, taking into consideration asset allocations, historical returns and the current economic environment. Based on these factors the Company expects its assets will earn an average of 4.00% per annum assuming its long-term mix will be consistent with its current mix.

Mexican Plan

Minera Mexico’s policy for determining asset mix targets includes periodic consultation with recognized third-party investment consultants. The expected long-term rate of return on plan assets is updated periodically, taking into consideration assets allocations, historical returns and the current economic environment. The fair value of plan assets is impacted by general market conditions. If actual returns on plan assets vary from the expected returns, actual results could differ.

The plan assets are managed by three financial institutions, Scotiabank Inverlat S.A., Banco Santander and GBM Grupo Bursatil Mexicano, S.A. 78% of the funds are invested in Mexican government securities, including treasury certificates and development bonds of the Mexican government. The remaining 22% is invested in common shares of Grupo Mexico. The plan assets are invested without restriction in active markets that are accessible when required and are therefore considered as level 1, in accordance with ASC 820 “Fair Value Measurement.”

These plans accounted for approximately 100% of benefit obligations. The following table represents the asset mix of the investment portfolio as of December 31:

	2020		2019
Asset category:
Treasury bills	78	%	80	%
Equity securities	22	%	20	%
	100	%	100	%

The amount of contributions that the Company expects to pay to the plan during 2021 is $2.3 million.

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Post-retirement Health Care Plan:

United States: The Company adopted a post-retirement health care plan for retired salaried employees eligible for Medicare in 1996. The Company manages the plan and is currently providing health benefits to retirees. The plan is accounted for in accordance with ASC 715 “Compensation retirement benefits.”

In Mexico, health services are provided by the Mexican Social Security Institute.

The components of net period benefit costs for the three years ended December 31, 2020 are as follows:

(in millions)	2020		2019		2018
Interest cost	$	1.3	$	0.9	$	0.9
Amortization of prior service cost/ (credit)		—		(0.2)		(0.2)
Net periodic benefit cost	$	1.3	$	0.7	$	0.7

The change in benefit obligation and a reconciliation of funded status are as follows:

	As of December 31,
(in millions)	2020		2019
Change in benefit obligation:
Projected benefit obligation at beginning of year	$	20.6	$	11.9
Interest cost		1.3		0.9
Actuarial loss/ (gain)-claims cost		—		—
Benefits paid		(1.5)		(1.3)
Actuarial (gain)/loss		4.5		8.6
Inflation adjustment		(1.1)		0.5
Projected benefit obligation at end of year	$	23.8	$	20.6
Change in plan assets:
Fair value of plan assets at beginning of year	$	—	$	—
Employer contributions		0.1		0.1
Benefits paid		(0.1)		(0.1)
Fair value of plan assets at end of year	$	—	$	—
Funded status at end of year:	$	23.8	$	20.6
ASC-715 amounts recognized in statement of financial position consists of:
Current liabilities	$	—	$	(0.1)
Non-current liabilities		(23.8)		(20.5)
Total	$	(23.8)	$	(20.6)
ASC-715 amounts recognized in accumulated other comprehensive income consists of:
Net loss (gain)	$	4.6	$	1.5
Total (net of income taxes of $(1.9) million and $(0.7) million in 2020 and 2019, respectively)	$	4.6	$	1.5

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The following table summarizes the changes in accumulated other comprehensive income for the years ended December 31, related to the post-retirement health care plan, net of income tax:

	As of December 31,
(in millions)	2020		2019
Reconciliation of accumulated other comprehensive income:
Accumulated other comprehensive income at beginning of plan year	$	1.5	$	(4.4)
Net loss/(gain) occurring during the year		3.2		6.0
Net loss/(gain) amortized during the year		—		0.1
Currency exchange rate adjustment		(0.1)		(0.2)
Net adjustment to accumulated other comprehensive income (net of income taxes of $(1.2) million and $(2.6) million in 2020 and 2019, respectively)		3.1		5.9
Accumulated other comprehensive income at end of plan year	$	4.6	$	1.5

The following table summarizes the amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost in 2020 and 2019, net of income tax:

	As of December 31,
(in millions)	2020		2019
Net loss / (gain)	$	3.2	$	5.9
Amortization of net (loss) gain		—		0.2
Total amortization expenses	$	3.2	$	6.1

The discount rates used in the calculation of other post-retirement benefits and cost as of December 31 were:

	2020		2019		2018
Expatriate health plan
Discount rate	1.90	%	2.85	%	3.90	%
Mexican health plan
Weighted average discount rate	7.43	%	7.15	%	8.45	%

The benefits expected to be paid in each of the next five years, and thereafter, are as follows:

	Expected
Year	Benefit Payments
	(in millions)
2021	$	1.5
2022		1.6
2023		1.5
2024		1.5
2025		1.6
2026 to 2030		8.6
Total	$	16.3

Expatriate Health Plan

For measurement purposes for pre 65 year old participants, a 5.1% annual rate of increase in the per capita cost of covered health care benefits was assumed for 2020 which gradually decrease to 4.2%. For post 65 year old the annual rate of increase in the per capita cost for 2020 is 4.9% which is assumed to decrease gradually to 4.0%.

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Assumed health care cost trend rates can have a significant effect on amounts reported for health care plans. However, because of the size of the Company’s plan, a one percentage-point change in assumed health care trend rate would not have a significant effect.

Mexican Health Plan

For measurement purposes, a 4.5% annual rate of increase in the per capita cost of covered health care benefits was assumed for 2020 and remains at that level thereafter.

An increase in other benefit cost trend rates have a significant effect on the amount of the reported obligations, as well as component cost of the other benefit plan. One percentage-point change in assumed other benefits cost trend rates would have the following effects:

	One Percentage
	Point
(in millions)	Increase		Decrease
Effect on total service and interest cost components	$	1.9	$	1.5
Effect on the post-retirement benefit obligation	$	24.7	$	22.2

NOTE 13—COMMITMENTS AND CONTINGENCIES:

Environmental matters:

The Company has instituted extensive environmental conservation programs at its mining facilities in Peru and Mexico. The Company’s environmental programs include, among others, water recovery systems to conserve water and minimize the impact on nearby streams, reforestation programs to stabilize the surface of the tailings dams and the implementation of scrubbing technology in the mines to reduce dust emissions.

Environmental capital investments in years 2020, 2019 and 2018, were as follows (in millions):

	2020		2019		2018
Peruvian operations (*)	$	(3.3)	$	18.6	$	59.3
Mexican operations		41.1		64.3		43.5
	$	37.8	$	82.9	$	102.8

(*)The activity in 2020 includes prepayment settlements classified to expenses.

Peruvian operations: The Company’s operations are subject to applicable Peruvian environmental laws and regulations. The Peruvian government, through the Ministry of Environment (“MINAM”) conducts annual audits of the Company’s Peruvian mining and metallurgical operations. Through these environmental audits, matters related to environmental obligation, compliance with legal requirements, atmospheric emissions, effluent monitoring and waste management are reviewed. The Company believes that it is in material compliance with applicable Peruvian environmental laws and regulations. Peruvian law requires that companies in the mining industry provide assurances for future mine closure and remediation. In accordance with the requirements of this law, the Company’s closure plans were approved by MINEM. See Note 10 “Asset retirement obligation,” for further discussion of this matter.

Air Quality Standards (“AQS”): In June 2017, MINAM enacted a supreme decree which defines new AQS for daily sulfur dioxide in the air. As of December 31, 2020, the Company maintains a lower daily average level of µg/m3 of SO2, than those required by the new AQS.

Soil Environmental Quality Standards (“SQS”): In 2013, the Peruvian government enacted Soil Quality Standards. In accordance with the regulatory requirements of the law, the Company prepared Soil Descontamination Plans (“SDP”)

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for environmentally impacted sites in each of its operation units (Toquepala, Cuajone and Ilo) with the assistance of consulting companies. The cost of these SDPs are not material, either individually or in aggregated form, for the financial statements of the Company.

Mexican operations: The Company’s operations are subject to applicable Mexican federal, state and municipal environmental laws, to Mexican official standards, and to regulations for the protection of the environment, including regulations relating to water supply, water quality, air quality, noise levels and hazardous and solid waste.

The principal legislation applicable to the Company’s Mexican operations is the Federal General Law of Ecological Balance and Environmental Protection (the “General Law”), which is enforced by the Federal Bureau of Environmental Protection (“PROFEPA”). PROFEPA monitors compliance with environmental legislation and enforces Mexican environmental laws, regulations and official standards. It may also initiate administrative proceedings against companies that violate environmental laws, which in the most extreme cases may result in the temporary or permanent shutdown of non-complying facilities, the revocation of operating licenses and/or other sanctions or fines.

In 2011, the General Law was amended to provide an individual or entity the ability to contest administrative acts, including environmental authorizations, permits or concessions granted, without the need to demonstrate the actual existence of harm to the environment as long as it can be argued that the harm may be caused. In addition, in 2011, amendments to the Civil Federal Procedures Code (“CFPC”) were enacted, which established three categories of collective actions under which a group of 30 or more individuals can be considered sufficient to prove a “legitimate interest” to file civil actions for injuries derived from alleged violations of environmental, consumer protection, financial services and economic competition laws and to seek restitution or economic compensation for the alleged injuries or the suspension of the activities which allegedly generated the injuries in question. The amendments to the CFPC may result in more litigation, with plaintiffs seeking remedies, including suspension of the activities alleged to cause harm.

In 2013, the Environmental Liability Federal Law was enacted. The law establishes general guidelines for actions to be considered to likely cause environmental harm. If a possible determination regarding harm occurs, environmental clean-up and remedial actions sufficient to restore environment to a pre-existing condition should be taken. Under this law, if restoration is not possible, compensation measures should be provided. Criminal penalties and monetary fines can be imposed under this law.

On February 2019, the Mexican Supreme Court confirmed the constitutionality of an ecological tax on extractive activities developed in the state of Zacatecas, which taxes the environmental remediation actions; emissions of certain gases to the atmosphere; emissions of pollutant substances to the soil or water; and waste storage within the state territory. The Company has determined that this new environmental regulation will have no impact on its financial position.

Guaymas sulfuric acid spill:

On July 9, 2019, there was an incident at the Company´s Marine Terminal in Guaymas, Sonora, that caused the discharge of approximately three cubic meters of sulfuric acid into the sea in the industrial port area.

The Guaymas bay has an estimated water volume of 340 million cubic meters. The spill, upon entering in contact with the sea’s alkaline conditions, led to quick dilution of the discharge and the sulfuric acid was naturally and immediately neutralized. As a result, the discharge was considered harmless; the report from the Ministry of Navy found that neither the flora nor fauna of the port area were affected.

On July 10, 2019, PROFEPA made a first inspection of the area, concluding that the Company executed all the appropriate procedures in order to contain the discharge, and no reference was made to the existence of negative impacts on the environment resulting from the incident.

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On Friday, July 19, 2019, PROFEPA revisited the facilities to carry out a second inspection, declaring a partial temporary shutdown that affected only the storage process and transportation of sulfuric acid at the terminal, arguing the absence of an authorization of environmental impact. It is important to note that these facilities have been in operation since 1979, prior to the 1988 Mexican General Law of Ecological Balance and the Protection of the Environment. Companies that were operating before the aforementioned law are exempt from the permit requirement. In addition, in 2009, PROFEPA awarded a certification of “Clean Industry and Environmental Quality” to the facility which was subsequently renewed four times (for a two-year period each time).

The Company is not aware of the reasons or causes for this partial and temporary closure, but will continue working with the environmental authorities to provide certainty that the operation is in strict compliance with environmental regulations. The Company expects the environmental authorities to suspend the partial temporary shutdown, once they resolve their concerns. Currently, the Company does not expect any impact on its operations. As of December 31, 2020, the matter is pending resolution.

Litigation matters:

Peruvian operations

The Tia Maria Mining Project

There are five lawsuits filed against the Peruvian Branch of the Company related to the Tia Maria project. The lawsuits seek (i) to declare null and void the resolution that approved the Environmental Impact Assessment of the project; (ii) the cancellation of the project and the withdrawal of mining activities in the area; (iii) to declare null and void the mining concession application for the Tia Maria project; and (iv) to declare null and void the resolution that approved the construction license. The lawsuits were filed by Messrs. Jorge Isaac del Carpio Lazo (filed May 22, 2015), Ernesto Mendoza Padilla (filed May 26, 2015), Juan Alberto Guillen Lopez (filed June 18, 2015), Junta de Usuarios del Valle del Tambo (filed April 30, 2015), and Gobierno Regional de Arequipa (filed December 16, 2019).

The del Carpio Lazio case was rejected by the court of first instance on November 14, 2016. The plaintiff filed an appeal before the Superior Court on January 3, 2017. On January 9, 2018, the lawyers of both parties presented their respective positions before the Appellate Court. On March 8, 2018, the Appellate Court issued its final decision, which upheld the first instance ruling. On April 27, 2018, the plaintiff filed an extraordinary appeal before the Supreme Court. As of December 31, 2020, the case remains pending resolution.

The Mendoza Padilla case was initially rejected by the lower court on July 8, 2015. This ruling was confirmed by the Superior Court on June 14, 2016. On July 12, 2016, the case was appealed before the Constitutional Court. On November 20, 2018, the Constitutional Court reversed the previous decisions and remanded the case to the lower court for further action. In the third quarter of 2020, the Company was notified that the complaint had been reinstated. The Company answered the complaint on September 15, 2020. On December 2, 2020, the lower court issued a resolution, considering the complaint answered. As of December 31, 2020, the case remains pending resolution.

The Guillen Lopez case is currently before the lower court. On July 19, 2019, the oral arguments took place. On January 7, 2020, the Judge decided to suspend the proceeding until the del Carpio Lazio case is concluded. Therefore, as of December 31, 2020, the case remains pending resolution.

The Junta de Usuarios del Valle del Tambo case is currently before the lower court. On May 2016, the Company was included in the process, after the Ministry of Energy and Mines filed a civil complaint. On March 6, 2019, the Company was formally notified of the lawsuit and answered the complaint on March 20, 2019. On July 8, 2019, the Company

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requested the suspension of the proceeding until the del Carpio Lazio case is concluded. As of December 31, 2020, the case remains pending resolution.

The Gobierno Regional de Arequipa case is currently before the lower court and the Company answered the complaint on September 15, 2020. As of December 31, 2020, the case remains pending resolution.

The Company asserts that these lawsuits are without merit and is vigorously defending against them. The potential contingency amount for these cases cannot be reasonably estimated by management at this time.

Special Regional Pasto Grande Project (“Pasto Grande Project”)

In 2012, the Pasto Grande Project, an entity of the Regional Government of Moquegua, filed a lawsuit against SCC’s Peruvian Branch alleging property rights over a certain area used by the Peruvian Branch and seeking the demolition of the tailings dam where SCC’s Peruvian Branch has deposited its tailings from the Toquepala and Cuajone operations since 1995. The Peruvian Branch has had title to use the area in question since 1960 and has, since 1995, constructed and operated the tailings dams with proper governmental authorization. Upon a motion filed by the Peruvian Branch, the lower court has included MINEM as a defendant in this lawsuit. MINEM has answered the complaint and denied the validity of the claim. As of December 31, 2020, the case was pending resolution without further developments. SCC’s Peruvian Branch asserts that the lawsuit is without merit and is vigorously defending against it. The amount of this contingency cannot be reasonably estimated by management at this time.

Mexican operations

The Accidental Spill at Buenavista Mine of 2014

In relation to the 2014 accidental spill of copper sulfate solution that occurred at a leaching pond in the Buenavista mine, the following legal procedures are pending against the Company:

On August 19, 2014, PROFEPA, as part of the administrative proceeding initiated after the spill, announced the filing of a criminal complaint against Buenavista del Cobre S.A. de C.V. (“BVC”), a subsidiary of the Company, in order to determine those responsible for environmental damages. During the second quarter of 2018, the criminal complaint was dismissed. This decision was appealed and was pending resolution as of December 31, 2020.

Through the first half of 2015, six collective action lawsuits were filed in federal courts in Mexico City and Sonora against two subsidiaries of the Company seeking economic compensation, clean up and remedial activities in order to restore the environment to its pre-existing conditions. Two of the collective action lawsuits have been dismissed by the court. As of December 31, 2020, four lawsuits continue in process: three were filed by Acciones Colectivas de Sinaloa, A.C. and one, by Defensa Colectiva, A.C.; requesting precautionary measures about construction of facilities for monitoring public health services and prohibiting the closure of the Rio Sonora Trust.

Similarly, during 2015, eight civil action lawsuits were filed against BVC in the state courts of Sonora seeking damages for alleged injuries and for moral damages as a consequence of the spill. The plaintiffs in the state court lawsuits are: Jose Vicente Arriola Nunez et al; Santana Ruiz Molina et al; Andres Nogales Romero et al; Teodoro Javier Robles et al; Gildardo Vasquez Carvajal et al; Rafael Noriega Souffle et al; Grupo Banamichi Unido de Sonora El Dorado, S.C. de R.L. de C.V; and Marcelino Mercado Cruz. In 2016, three additional civil action lawsuits, claiming similar damages, were filed by Juan Melquicedec Lebaron; Blanca Lidia Valenzuela Rivera et al and Ramona Franco Quijada et al. In 2017, BVC was served with thirty-three additional civil action lawsuits, claiming similar damages. The lawsuits were filed by Francisco Javier Molina Peralta et al; Anacleto Cohen Machini et al; Francisco Rafael Alvarez Ruiz et al; Jose Alberto Martinez Bracamonte et al; Gloria del Carmen Ramirez Duarte et al; Flor Margarita Sabori et al; Blanca Esthela Ruiz Toledo et al; Julio Alfonso Corral Dominguez et al; Maria Eduwiges Bracamonte Villa et al; Francisca Marquez

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Dominguez et al; Jose Juan Romo Bravo et al; Jose Alfredo Garcia Leyva et al; Gloria Irma Dominguez Perez et al; Maria del Refugio Romero et al; Miguel Rivas Medina et al; Yolanda Valenzuela Garrobo et al; Maria Elena Garcia Leyva et al; Manuel Alfonso Ortiz Valenzuela et al; Francisco Alberto Arvayo Romero et al; Maria del Carmen Villanueva Lopez et al; Manuel Martin Garcia Salazar; Miguel Garcia Arguelles et al; Dora Elena Rodriguez Ochoa et al; Honora Eduwiges Ortiz Rodriguez et al; Francisco Jose Martinez Lopez et al; Maria Eduwiges Lopez Bustamante; Rodolfo Barron Villa et al, Jose Carlos Martinez Fernandez et al, Maria de los Angeles Fabela et al; Rafaela Edith Haro et al; Luz Mercedes Cruz et al; Juan Pedro Montaño et al; and Juana Irma Alday Villa. In the first quarter of 2018, BVC was served with another civil action lawsuit, claiming similar damages. The lawsuit was filed by Alma Angelina Del Cid Rivera et al. In the last quarter of 2018, BVC was served with other three civil action lawsuits, claiming similar damages. These lawsuits were filed by Los Corrales de la Estancia, S.C. de R.L.; Jose Antonio Navarro; Jesus Maria Peña Molina, et al; these actions were dismissed by the court, because they have expired. As of December 31, 2020, forty-five cases remain pending resolution.

In 2015, four constitutional lawsuits (juicios de amparo) were filed before Federal Courts against various authorities and against a subsidiary of the Company, arguing; (i) the alleged lack of a waste management program approved by SEMARNAT; (ii) the alleged lack of a remediation plan approved by SEMARNAT with regard to the August 2014 spill; (iii) the alleged lack of community approval regarding the environmental impact authorizations granted by SEMARNAT to one subsidiary of the Company; and (iv) the alleged inactivity of the authorities with regard of the spill in August 2014. The plaintiffs of these lawsuits are: Francisca Garcia Enriquez, et al filed two lawsuits, Francisco Ramon Miranda, et al and Jesus David Lopez Peralta et al. In the third quarter of 2016, four additional constitutional lawsuits, claiming similar damages were filed by Mario Alberto Salcido et al; Maria Elena Heredia Bustamante et al; Martin Eligio Ortiz Gamez et al; and Maria de los Angeles Enriquez Bacame et al. In the third quarter of 2017, BVC was served with another constitutional lawsuit filed by Francisca García Enriquez et al. In 2018, BVC was served with two additional constitutional lawsuits that were filed against SEMARNAT by Norberto Bustamante et al. Regarding the constitutional lawsuit filed by Maria Elena Heredia Bustamante et al; in which it was claimed the lack of community approval regarding the authorization granted by SEMARNAT to build the new BVC tailings dam, on September 5, 2018, the Supreme Court of Justice issued a resolution establishing that such authorization was granted to BVC in compliance with the applicable legislation. However, SEMARNAT must carry out a public meeting to inform the community of the technical aspects required to build the dam, potential impacts and prevention measures, with no material effects to BVC’s operations. SEMARNAT has carried out the consultation ordered by the Supreme Court. As a result, has informed the corresponding Judge about its compliance with the resolution, in which BVC was imposed additional measures of environmental impact prevention, such as: (i) the building of at least three monitoring wells downstream from the curtain of the contingency dam in a period of six months; (ii) monitoring of the groundwater level and water quality every six months; (iii) carrying out rain collection work in order to restore water to the Sonora River basin, for which six months are granted to present the execution program; (iv) determine the location of wildlife conservation and protection areas and define the need to establish biological corridors; (v) obtain photographic or videographic evidence every six months; (vi) submitting to SEMARNAT two years before the closure and abandonment of the site, or earlier if necessary, the closure program that includes the cleaning and restoration of the soil including Mexican regulation NOM-141; (vii) include the measures in the Environmental Monitoring Program according to the environmental components impacted; and (viii) hiring an external environmental consultant to validate compliance with the current and new conditions that are imposed. The foregoing does not impact BVC’s operations. Likewise, it is noted that the lawsuits filed by Maria de los Angeles Enriquez Bacame and Norberto Bustamante have been dismissed and closed without prejudice to the Company. As of December 31, 2020, the remaining cases were still pending resolution.

It is currently not possible to determine the extent of the damages sought in these state and federal lawsuits but the Company believes that these lawsuits are without merit. Accordingly, the Company is vigorously defending against them. Nevertheless, the Company believes that none of the legal proceedings resulting from the spill, individually or in the aggregate, would have a material effect on its financial position or results of operations.

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Corporate operations

Carla Lacey, on behalf of herself and all other similarly situated stockholders of Southern Copper Corporation, and derivatively on behalf of Southern Copper Corporation

In April 2019, a derivative lawsuit was filed against the Company, certain current and former Directors, and Grupo Mexico in the Delaware Court of Chancery relating to certain construction contracts, contracts for the purchase and sale of minerals, and transportation contracts entered into between the Company’s subsidiaries and subsidiaries of Grupo Mexico.

In October 2019, the plaintiff amended the complaint to include claims related to certain administrative services contracts between the Company’s subsidiaries and Grupo Mexico. The amended complaint alleges, among other things, that the construction contracts, the mineral contracts, the transportation contracts, and the administrative services contracts were unfair as a result of breaches of fiduciary duties and the Company’s charter. The amended complaint also added Americas Mining Corporation (“AMC”) as a defendant, alleging that AMC breached its fiduciary duties as a controlling stockholder of the Company. The amended complaint seeks, among other things, unspecified monetary damages. In January 2020, the Company, the current and former Directors, and Grupo Mexico responded to the complaint by filing motions to dismiss. The Plaintiff filed a brief in response to the motions on March 13, 2020. On July 16, 2020, the Court denied the motions to dismiss the breach of fiduciary duty claims against the Directors. On October 6, 2020, the Court dismissed the Plaintiff’s claims against Grupo Mexico for lack of personal jurisdiction. On February 11, 2021, the Court granted the Directors’ motion to dismiss plaintiff’s breach of contract claim. The Court also granted AMC’s motion to dismiss all claims against AMC other than those related to the mineral contracts.

As of February 2021, because the Company has not reached a conclusion as to whether an unfavorable outcome is either probable or remote, the Company expresses no opinion as to the likelihood of an unfavorable outcome or the amount or range of any possible loss to the Company.

Labor matters:

Peruvian operations: 66% of the Company's 4,739 Peruvian employees were unionized at December 31, 2020. Currently, there are six separate unions, one large union and five smaller unions. In June 2018, the Company signed a three-year collective bargaining agreement with one of the smaller unions. This agreement includes, among other things, annual salary increases of 5% for each year starting September 2018, and a signing bonus of S/ 45,000 (approximately $13,600) which was recorded as labor expense. In August 2018, the Company signed a three-year collective bargaining agreement with three additional unions. This agreement includes, among other things, annual salary increases of 5% for each year starting December 2018, and a signing bonus of S/ 45,000 (approximately $13,600) which was recorded as labor expense. In March 2019, the Company resolved pending issues by means of an arbitration with one additional union. The arbitral award included annual salary increases of 5% for each year starting September 2018, and a signing bonus of S/45,000 (approximately $13,600) which was recorded as labor expense in the first quarter of 2019.

In May 2019, an arbitration resolved pending issues with the remaining union. The arbitral award included a salary increase of 5.5% beginning in September 2018 and a bonus of S/16,000 (approximately $4,800) for the one-year agreement, which was recorded as labor expense in the second quarter of 2019. In November 2019, the Company signed a collective bargaining agreement for three years with the same union. This agreement included, among other things, a salary increase of 5% for each year starting in September 2019 and a bonus of S/45,000 (approximately $13,300), which was recorded as labor expenses in the fourth quarter of 2019.

Mexican operations: In recent years, the Mexican operations have experienced a positive improvement in their labor environment, as workers opted to change their affiliation from the Sindicato Nacional de Trabajadores Mineros, Metalurgicos y Similares de la Republica Mexicana (the “National Mining Union”) to other less politicized unions.

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The workers of the San Martin mine were on strike since July 2007. On February 28, 2018, the striking workers of the San Martín mine of IMMSA held an election to vote on the union that would hold the collective bargaining agreement at the San Martín mine. The Federacion Nacional de Sindicatos Independientes (the National Federation of Independent Unions) won the vote by a majority. Nevertheless, the vote was challenged by the National Mining Union. On June 26, 2018, the Federal Mediation and Arbitration Board issued a ruling recognizing the election results. Due to the agreement between workers and the Company to end the protracted strike, on August 22, 2018, the Federal Mediation and Arbitration Board authorized the restart of operations of the San Martín mine. Such authorization was challenged by the National Mining Union. On April 4, 2019, the Federal Mediation and Arbitration Board recognized, once again, the election results from February 28, 2018, by which the National Federation of Independent Unions won by a majority. In the last quarter of 2019, a Federal Court issued a resolution that established that the Labor Court should analyze the list of workers with the right to vote in the union election. The Company and the National Federation of Independent Unions challenged such determination before the Supreme Court of Justice and the case was still pending resolution as of December 31, 2020. The Company is working on a rehabilitation plan to restore operations at the San Martin mine with a budget of $97.7 million. As of December 31, 2020, the plan is underway with a total expense of $86.4 million.

In the case of the Taxco mine, its workers have been on strike since July 2007. After several legal procedures, in August 2015, the Supreme Court decided to assert jurisdiction over the case and to rule on it directly. As of December 31, 2020, the case remains pending resolution without further developments.

It is expected that operations at the Taxco mine will remain suspended until the labor issues are resolved. In view of the lengthy strike, the Company has reviewed the carrying value of the Taxco mine to ascertain whether impairment exists. The Company concluded that there is a non-material impairment of the assets located at this mine.

In 2020, a small group of workers at the Charcas mine claimed an additional workers’ participation payment and a minor incident was reported. This claim lacked a legal basis because the Company had completely fulfilled said obligation with the workers in question. Consequently, the Company took legal action and through conciliation and mediation with labor authorities, the incident concluded with no further repercussions for the Company.

Other legal matters:

The Company is involved in various other legal proceedings incidental to its operations, but the Company does not believe that decisions adverse to it in any such proceedings, individually or in the aggregate, would have a material effect on its financial position or results of operations.

Other commitments:

Peruvian Operations

Tia Maria:

On August 1, 2014, the Company received the final approval of Tia Maria’s Environmental Impact Assessment (“EIA”). On July 8, 2019, the Company received the construction permit for this 120,000 ton annual SX-EW copper greenfield project with a total capital budget of $1,400 million. This permit was obtained after completing an exhaustive review process, complying with all established regulatory requirements and addressing all observations raised.

On July 15, 2019, anti-mining groups staged a violent demonstration affecting economic as well as other activities in the Islay province. These actions were followed by the filing of three complaints, sponsored by groups opposing the Tia Maria project, with the Mining Council, which is the Peruvian administrative authority responsible for ruling on these complaints. The Mining Council temporarily suspended the construction permit on August 8, 2019. On October 7, 2019, as part of the process, the Mining Council conducted a hearing to hear the complaints and the Company’s position. On

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October 30, 2019, the Mining Council of the Peruvian Ministry of Energy and Mines ratified the construction permit for the Tia Maria project.

The Company has been working to promote the welfare of the Islay province population. As part of these efforts, the Company has implemented social programs in education, healthcare and productive development to improve the quality-of-life in the region. The Company also has promoted agricultural and livestock activities in the Tambo Valley and supported growth in manufacturing, fishing and tourism in Islay.

During the construction and operation phase, the Company will make it a priority to hire local labor to fill the 9,000 jobs (3,600 direct and 5,400 indirect) that the Company expects to generate during Tia Maria’s construction phase. When operating, the Company expects Tia Maria to directly employ 600 workers and indirectly provide jobs for another 4,200. Additionally, from day one of its operations, the Company will generate significant contributions to revenues in the Arequipa region via royalties and taxes.

Tia Maria’s project budget is approximately $1.4 billion, of which $338.8 million has been invested through December 31, 2020. This project will use state-of-the-art SX-EW technology with the highest international environmental standards. SX-EW facilities are the most environmentally friendly in the industry as they do not require a smelting process and therefore, release no emissions into the atmosphere.

Michiquillay:

In June 2018, the Company signed a contract for the acquisition of the Michiquillay copper project in Cajamarca, Peru, at a purchase price of $400 million. Michiquillay is a world class mining project with estimated mineralized material of 1,150 million tons and a copper grade of 0.63%. It is expected to produce 225,000 tons of copper per year (along with by-products of molybdenum, gold and silver) for an initial mine life of more than 25 years.

The Company paid $12.5 million at the signing of the contract. The balance of $387.5 million will be paid if the Company decides to develop the project and it is not a present obligation.

Corporate Social Responsibility:

The Company has a corporate social responsibility policy to maintain and promote the continuity of its mining operations and obtain the best results. The main objective of this policy is to integrate the Company´s operations with local communities in the areas of influence of its operations by creating permanent positive relationships to develop optimum social conditions and promote sustainable development in the area. Accordingly, the Company has made the following commitments:

Tacna Region: In connection with the Toquepala concentrator expansion, the Company has committed to fund various social and infrastructure improvement projects in Toquepala's neighboring communities. The total amount committed for these purposes is S/ 445.0 million (approximately $122.8 million).

As the Toquepala expansion project has been completed, the Company considers that these commitments constitute present obligations of the Company and consequently has recorded a liability of $41.3 million in its consolidated financial statements as of December 31, 2020.

In addition, the Company has committed S/ 69.7 million (approximately $19.2 million) for the construction of one infrastructure project in the Tacna region under the “social investment for taxes” (obras por impuestos) program which allows the Company to use these amounts as an advance payment of taxes.

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Moquegua Region: In the Moquegua region, the Company participates in a “development roundtable” with local municipal authorities and community representatives to discuss the social needs and the way the Company could contribute to sustainable development in the region. Currently, the roundtable is discussing the creation of a Moquegua Region Development Fund for which the Company has offered a contribution of S/ 1,000 million (approximately $275.9 million). While final funding is not yet settled, the Company has committed to contribute S/ 108.4 million (approximately $29.9 million) as an advance, which is being utilized to fund an educational project. In addition, there is a commitment to finance the construction of a residual water treatment plant in Ilo for S/ 78.0 million (approximately $21.5 million).

In addition, the Company has committed S/ 86.9 million (approximately $24.0 million) for the construction of two infrastructure projects in the Moquegua region under the “social investment for taxes” (obras por impuestos) program, which allows the Company to use these amounts as an advance payment of taxes.

Power purchase agreements:

● Electroperu S.A.: In June 2014, the Company entered into a power purchase agreement for 120 megawatt (“MW”) with the state power company Electroperu S.A., under which Electroperu S.A. began supplying energy for the Peruvian operations for twenty years starting on April 17, 2017.

● Kallpa Generacion S.A. (“Kallpa”): In July 2014, the Company entered into a power purchase agreement for 120MW with Kallpa, an independent Israeli owned power company, under which Kallpa will supply energy for the Peruvian operations for ten years starting on April 17, 2017 and ending on April 30, 2027. In May 2016, the Company signed an additional power purchase agreement for a maximum of 80MW with Kallpa, under which Kallpa began supplying energy for the Peruvian operations related to the Toquepala Expansion and other minor projects for ten years starting on May 1, 2017 and ending after ten years of commercial operation of the Toquepala Expansion or on April 30, 2029; whichever occurs first.

Mexican operations

Power purchase agreements:

● MGE: In 2012, the Company signed a power purchase agreement with MGE, an indirect subsidiary of Grupo Mexico, to supply power to some of the Company’s Mexican operations through 2032. For further information, please see Note 17 “Related party transactions”.

● Eolica el Retiro, S.A.P.I. de C.V.: In 2013, the Company signed a power purchase agreement with Eolica el Retiro, S.A.P.I de C.V. a windfarm energy producer that is an indirect subsidiary of Grupo Mexico, to supply power to some of the Company’s Mexican operations. For further information, please see Note 17 “Related party transactions”.

● Parque Eolico de Fenicias, S. de R.L. de C.V.: On February 20, 2020, the Company signed a power purchase agreement with Parque Eolico de Fenicias, S. de R.L. de C.V., an indirect subsidiary of Grupo Mexico, to supply 611,400 MWh of power per year to some of the Company´s Mexican operations for 20 years. This agreement will start in January 2021.

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Corporate operations

Commitment for Capital projects:

As of December 31, 2020, the Company has committed approximately $365.8 million for the development of its capital investment projects.

Tax contingency matters:

Tax contingencies are provided for under ASC 740-10-50-15 Uncertain tax position (see Note 7 “Income taxes”).

NOTE 14—STOCKHOLDERS’ EQUITY

Treasury Stock:

Activity in treasury stock in the years 2020 and 2019 was as follows (in millions):

	2020		2019
Southern Copper common shares
Balance as of January 1,	$	2,767.9	$	2,768.3
Used for corporate purposes		(0.4)		(0.4)
Balance as of December 31,		2,767.5		2,767.9
Parent Company (Grupo Mexico) common shares
Balance as of January 1,		281.0		251.3
Other activity, including dividend, interest and foreign currency transaction effect		15.0		29.7
Balance as of December 31,		296.0		281.0
Treasury stock balance as of December 31,	$	3,063.5	$	3,048.9

SCC shares of common stock in treasury:

At December 31, 2020 and 2019, treasury stock holds 111,522,817 shares and 111,537,217 shares of SCC’s common stock with a cost of $2,767.5 million and $2,767.9 million, respectively. The shares of SCC’s common stock held in treasury are used for Director’s stock award plans and available for general corporate purposes.

SCC share repurchase program:

In 2008, the Company’s Board of Directors (“BOD”) authorized a $500 million share repurchase program that has since been increased by the BOD and is currently authorized to $3 billion. Pursuant to this program, the Company has purchased 119.5 million shares of common stock at a cost of $2.9 billion. These shares are available for general corporate purposes. The Company may purchase additional shares of its common stock from time to time, based on market conditions and other factors. This repurchase program has no expiration date and may be modified or discontinued at any time.

There has not been activity in the SCC share repurchase program since the third quarter of 2016. The NYSE closing price of SCC common shares at December 31, 2020 was $65.12 and the maximum number of shares that the Company could purchase at that price is 1.3 million shares.

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Grupo Mexico’s direct and indirect ownership remains at 88.9% as of December 31, 2020.

Directors’ Stock Award Plan:

The Company established a stock award compensation plan for certain directors who are not compensated as employees of the Company. Under this plan, participants received 1,200 shares of common stock upon election and 1,200 additional shares following each annual meeting of stockholders thereafter. 600,000 shares of Southern Copper common stock have been reserved for this plan. On April 26, 2018, the Company’s stockholders approved a five-year extension of the Plan until January 28, 2023 and an increase of the shares award from 1,200 to 1,600. The fair value of the award is measured each year at the date of the grant. In 2020 and 2019 the stock-based compensation expense under this plan equaled $0.4 million for each of these years.

The activity of this plan for the years ended December 31, 2020 and 2019 was as follows:

	2020	2019
Total SCC shares reserved for the plan	600,000	600,000
Total shares granted at January 1,	(377,200)	(362,800)
Granted in the period	(14,400)	(14,400)
Total shares granted at December 31,	(391,600)	(377,200)
Remaining shares reserved	208,400	222,800

Parent Company common shares:

At December 31, 2020 and 2019, there were in treasury 87,598,097 and 93,082,532 of Grupo Mexico’s common shares, respectively.

Employee Stock Purchase Plan:

2015 Plan: In January 2015, the Company offered to eligible employees a new stock purchase plan through a trust that acquires series B shares of Grupo Mexico stock for sale to its employees, and employees of subsidiaries, and certain affiliated companies. The purchase price was established at 38.44 Mexican pesos (approximately $1.86) for the initial subscription, which expires in January 2023. Every two years employees will be able to acquire title to 50% of the shares paid in the previous two years. The employees will pay for shares purchased through monthly payroll deductions over the eight-year period of the plan. At the end of the eight-year period, the Company will grant the participant a bonus of 1 share for every 10 shares purchased by the employee. Any future subscription will be at the average market price at the date of acquisition or the grant date.

If Grupo Mexico pays dividends on shares during the eight-year period, the participants will be entitled to receive the dividend in cash for all shares that have been fully purchased and paid as of the date that the dividend is paid. If the participant has only partially paid for shares, the entitled dividends will be used to reduce the remaining liability owed for purchased shares.

In the case of voluntary or involuntary resignation/termination of the employee, the Company will pay to the employee the fair market sales price at the date of resignation of the fully paid shares, net of costs and taxes. When the fair market sales value of the shares is higher than the purchase price, the Company will apply a deduction over the amount to be paid to the employee based on a decreasing schedule specified in the plan.

In case of retirement or death of the employee, the Company will render the buyer or his legal beneficiary, the fair market sales value as of the date of retirement or death of the shares effectively paid, net of costs and taxes.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The stock-based compensation expense for the years ended December 31, 2020, 2019 and 2018 and the unrecognized compensation expense under this plan were as follows (in millions):

	2020		2019		2018
Stock based compensation expense	$	0.6	$	0.6	$	0.6
Unrecognized compensation expense	$	1.4	$	2.0	$	2.6

The following table presents the stock award activity of this plan for the years ended December 31, 2020 and 2019:

		Unit Weighted Average
	Shares	Grant Date Fair Value
Outstanding shares at January 1, 2020	1,379,734	$	2.63
Granted	—
Exercised	(115,324)	$	2.63
Forfeited	—		—
Outstanding shares at December 31, 2020	1,264,410	$	2.63
Outstanding shares at January 1, 2019	1,840,336	$	2.63
Granted	—		—
Exercised	(460,602)	$	2.63
Forfeited	—		—
Outstanding shares at December 31, 2019	1,379,734	$	2.63

2018 Plan: In November 2018, the Company offered to eligible employees a new stock purchase plan (the "New Employee Stock Purchase Plan") through a trust that acquires series B shares of Grupo Mexico stock for sale to its employees, and employees of subsidiaries, and certain affiliated companies. The purchase price was established at 37.89 Mexican pesos (approximately $1.86) for the initial subscription, which expires in October 2026. Every two years employees will be able to acquire title to 50% of the shares paid in the previous two years. The employees will pay for shares purchased through monthly payroll deductions over the eight-year period of the plan. At the end of the eight-year period, the Company will grant the participant a bonus of 1 share for every 10 shares purchased by the employee. Any future subscription will be at the average market price at the date of acquisition or the grant date.

If Grupo Mexico pays dividends on shares during the eight-year period, the participants will be entitled to receive the dividend in cash for all shares that have been fully purchased and paid as of the date that the dividend is paid. If the participant has only partially paid for shares, the entitled dividends will be used to reduce the remaining liability owed for purchased shares.

In the case of voluntary or involuntary resignation/termination of the employee, the Company will pay to the employee the fair market sales price at the date of resignation of the fully paid shares, net of costs and taxes. When the fair market sales value of the shares is higher than the purchase price, the Company will apply a deduction over the amount to be paid to the employee based on a decreasing schedule specified in the plan.

In case of retirement or death of the employee, the Company will render the buyer or his legal beneficiary, the fair market sales value as of the date of retirement or death of the shares effectively paid, net of costs and taxes.

The stock-based compensation expense for the years ended December 31, 2020 and 2019 and the unrecognized compensation expense under this plan were as follows (in millions):

	2020		2019
Stock based compensation expense	$	0.7	$	0.7
Unrecognized compensation expense	$	3.8	$	4.5

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The following table presents the stock award activity of this plan for the years ended December 31, 2020 and 2019:

			Unit Weighted Average
	Shares		Grant Date Fair Value
Outstanding shares at January 1, 2020	4,002,898	$	1.86
Granted	—
Exercised	(84,440)	$	1.86
Forfeited	—
Outstanding shares at December 31, 2020	3,918,458	$	1.86
Outstanding shares at January 1, 2019	2,782,424	$	1.86
Granted	1,238,169	$	1.86
Exercised	(17,695)	$	1.86
Forfeited	—		—
Outstanding shares at December 31, 2019	4,002,898	$	1.86

Executive Stock Purchase Plan:

Grupo Mexico also offers a stock purchase plan for certain members of its executive management and the executive management of its subsidiaries and certain affiliated companies. Under this plan, participants will receive incentive cash bonuses which are used to purchase shares of Grupo Mexico which are deposited in a trust.

Retained earnings:

As part of the settlement of claims brought on behalf of the Company and its shareholders against Grupo Mexico, AMC and certain current and former directors (together with Grupo Mexico and AMC, the ‘‘Defendants’’) a dividend of $0.44428 per share was paid on February 21, 2019 to shareholders of record at the close of business on February 11, 2019, other than the Defendants. The settlement dividend, totaling $36.5 million was an obligation of Grupo Mexico and

AMC and therefore, has been funded by them. In addition, Grupo Mexico and AMC paid $13.5 million of legal fees.

Non-controlling interest:

For all the years presented, in the consolidated statement of earnings the income attributable to non-controlling interest is based on the earnings of the Company's Peruvian Branch.

The non-controlling interest of the Company’s Peruvian Branch is for investment shares. These shares were generated by legislation in place in Peru from the 1970s through 1991; such legislation provided for the participation of mining workers in the profits of the enterprises for which they worked. This participation was divided between equity and cash. The investment shares included in the non-controlling interest on the consolidated balance sheets reflect outstanding equity distributions made to the Peruvian Branch’s employees.

In prior years, the Company acquired some Peruvian investment shares in exchange for newly issued common shares of the Company and through purchases at market value. These acquisitions were accounted for as purchases of non-controlling interests. The excess paid over the carrying value was assigned to intangible assets and is being amortized based on production. As a result of these acquisitions, the remaining investment shareholders hold a 0.71% interest in the Peruvian Branch and are entitled to a pro rata participation in the cash distributions made by the Peruvian Branch. The shares are recorded as a non-controlling interest in the Company's financial statements.

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NOTE 15—FAIR VALUE MEASUREMENT:

Subtopic 820-10 of ASC “Fair value measurement and disclosures -Overall” establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy under Subtopic 820-10 are described below:

Level 1 -Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

Level 2 -Inputs that are observable, either directly or indirectly, but do not qualify as Level 1 inputs. (i.e., quoted prices for similar assets or liabilities).

Level 3 -Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity).

The carrying amounts of certain financial instruments, including cash and cash equivalents, accounts receivable (other than accounts receivable associated with provisionally priced sales) and accounts payable approximate fair value due to their short maturities. Consequently, such financial instruments are not included in the following table that provides information about the carrying amounts and estimated fair values of other financial instruments that are not measured at fair value in the consolidated balance sheet as of December 31, 2020 and December 31, 2019 (in millions):

	At December 31, 2020				At December 31, 2019
	Carrying Value		Fair Value		Carrying Value		Fair Value
Liabilities:
Long-term debt level 1	$	6,193.6	$	8,692.1	$	6,190.6	$	7,675.3
Long-term debt level 2		350.6		385.7		750.2		776.1
Total long-term debt	$	6,544.2	$	9,077.8	$	6,940.8	$	8,451.4

Long-term debt is carried at amortized cost and its estimated fair value is based on quoted market prices classified as Level 1 in the fair value hierarchy except for the cases of the Yankee bonds and the notes due 2022, which qualify as Level 2 in the fair value hierarchy as they are based on quoted priced in market that are not active.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Fair values of assets and liabilities measured at fair value on a recurring basis were calculated as of December 31, 2020 and 2019, as follows (in millions):

	Fair Value at Measurement Date Using:
					Significant
	Fair Value		Quoted prices in		other		Significant
	as of		active markets for		observable		unobservable
	December 31,		identical assets		inputs		inputs
Description	2020		(Level 1)		(Level 2)		(Level 3)
Assets:
Short term investment:
—Trading securities	$	410.2	$	410.2	$	—	$	—
—Available-for-sale debt securities:
Corporate bonds		—		—		—		—
Asset backed securities		0.3		—		0.3		—
Mortgage backed securities		0.3		—		0.3		—
Accounts receivable:
—Embedded derivatives—Not classified as hedges:
Provisionally priced sales:
Copper		491.9		491.9		—		—
Molybdenum		129.2		129.2		—		—
Total	$	1,031.9	$	1,031.3	$	0.6	$	—

	Fair Value at Measurement Date Using:
					Significant
	Fair Value		Quoted prices in		other		Significant
	as of		active markets for		observable		unobservable
	December 31,		identical assets		inputs		inputs
Description	2019		(Level 1)		(Level 2)		(Level 3)
Assets:
Short term investment:
—Trading securities	$	80.0	$	80.0	$	—	$	—
—Available-for-sale debt securities:
Corporate bonds		—		—		—		—
Asset backed securities		0.4		—		0.4		—
Mortgage backed securities		0.3		—		0.3		—
Accounts receivable:
—Embedded derivatives-Not classified as hedges:
Provisionally priced sales:
Copper		326.5		326.5		—		—
Molybdenum		126.8		126.8		—		—
Total	$	534.0	$	533.3	$	0.7	$	—

The Company’s short-term trading securities investments are classified as Level 1 because they are valued using quoted prices of the same securities as they consist of bonds issued by public companies and publicly traded. The Company’s short-term available-for-sale investments are classified as Level 2 because they are valued using quoted prices for similar investments.

The Company’s accounts receivables associated with provisionally priced copper sales are valued using quoted market prices based on the forward price on the LME or on the COMEX. Such value is classified within Level 1 of the fair value hierarchy. Molybdenum prices are established by reference to the publication Platt’s Metals Week and are considered Level 1 in the fair value hierarchy.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NOTE 16—CONCENTRATION OF RISK:

The Company operates four open-pit copper mines, five underground poly-metallic mines, two smelters and ten refineries in Peru and Mexico and substantially all of its assets are located in these countries. No assurances can be made that any operations and assets of the Company that are subject to the jurisdiction of the governments of Peru and Mexico will not be adversely affected by future actions of such governments. Much of the Company’s products are exported from Peru and Mexico to customers principally in the United States, Europe, Asia and South America.

Financial instruments, which potentially subject the Company to a concentration of credit risk, consist primarily of cash and cash equivalents, short-term investments and trade accounts receivable. The Company invests or maintains available cash with various banks, principally in the United States, Mexico, Europe and Peru, or in commercial papers of highly-rated companies. As part of its cash management process, the Company regularly monitors the relative credit standing of these institutions. At December 31, 2020, SCC had invested its cash and cash equivalents and short-term investments as follows:

	$ in		% of total		% in one institution
Country	million		cash (1)		of country		of total cash
United States	$	1,968.8	75.9	%	14.1	%	10.7	%
Switzerland		340.3	13.1	%	79.4	%	10.4	%
Peru		35.5	1.4	%	81.4	%	1.1	%
Mexico		249.8	9.6	%	53.8	%	5.2	%
Total cash and short-term investment	$	2,594.4	100.0	%

(1) 97% of the Company’s cash is in U.S. dollars.

During the normal course of business, the Company provides credit to its customers. Although the receivables resulting from these transactions are not collateralized, the Company has not experienced significant problems with the collection of receivables.

The Company’s largest customers as percentage of accounts receivable and total sales were as follows:

	2020		2019		2018
Accounts receivable trade as of December 31,
Five largest customers	35.3	%	37.6	%	34.2	%
Largest customer	12.9	%	13.0	%	10.9	%
Total sales in year
Five largest customers	28.1	%	28.0	%	28.4	%
Largest customer	10.0	%	10.4	%	9.3	%

NOTE 17—RELATED PARTY TRANSACTIONS:

The Company has entered into certain transactions in the ordinary course of business with parties that are controlling shareholders or their affiliates. These transactions include the lease of office space, air and railroad transportation, construction services, energy supply, and other products and services related to mining and refining. The Company lends and borrows funds among affiliates for acquisitions and other corporate purposes. These financial transactions bear interest and are subject to review and approval by senior management, as are all related party transactions. Article Nine of the Amended and Restated Certificate of Incorporation of the Company prohibits the Company from engaging in a Material Affiliate Transaction that was not the subject of prior review by a committee of the Board of Directors with at least three members, each of whom is independent, and defines a Material Affiliate Transaction as a transaction or series

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

of related transactions between Grupo Mexico or one of its affiliates (other than the Company or its subsidiaries), on the one hand, and the Company or one of its subsidiaries, on the other hand, that involves consideration of more than $10.0 million in the aggregate. It is the Company’s policy that (i) a Material Affiliate Transaction not be entered into or continued without the review and approval by the Audit Committee or its subcommittee of related party transactions comprised of independent directors,(ii) any potential related party transaction process with aggregate consideration between $8.0 million and $10.0 million be authorized by the General Counsel and Chief Financial Officer of the Company and (iii) all related party transactions, including any Material Affiliate Transaction, be reported to the Audit Committee of the Board of Directors or to its subcommittee of related party transactions.

Receivable and payable balances with related parties are shown below (in millions):

	At December 31,
	2020		2019
Related parties receivable current:
Grupo Mexico and affiliates:
Asarco LLC	$	5.3	$	10.8
AMMINCO Apoyo Administrativo, S.A. de C.V. (“AMMINCO”)		—		0.1
Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates		0.3		0.3
Grupo Mexico		2.7		2.7
Mexico Generadora de Energia S. de R.L. ("MGE")		14.4		15.3
Grupo Mexico Servicios de Ingenieria, S.A. de C.V.		0.2		0.2
Related to the controlling group:
Boutique Bowling de Mexico S.A. de C.V.		0.2		0.1
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport")		—		0.4
Operadora de Cinemas S.A. de C.V.		0.2		0.1
	$	23.3	$	30.0
Related parties receivable non-current:
Grupo Mexico and affiliates:
Asarco LLC	$	—		59.5
Related parties payable:
Grupo Mexico and affiliates:
Asarco LLC	$	13.9	$	4.3
AMMINCO		19.6		16.9
Eolica El Retiro, S.A.P.I. de C.V.		0.3		—
Ferrocarril Mexicano S.A. de C.V.		4.7		6.4
Grupo Mexico		0.9		1.1
MGE		40.8		40.2
Mexico Compania Constructora S.A de C.V.		22.9		16.0
Grupo Mexico Servicios de Ingenieria, S.A. de C.V.		0.7		—
Related to the controlling group:
Boutique Bowling de Mexico S.A. de C.V.		0.3		0.2
Mexico Transportes Aereos S.A. de C.V. (“Mextransport”)		0.1		1.2
Operadora de Cinemas S.A. de C.V.		0.1		0.1
	$	104.3	$	86.4

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Purchase and sale activity:

Grupo Mexico and affiliates:

The following table summarizes the purchase and sale activities with Grupo Mexico and its affiliates in 2020, 2019 and 2018 (in millions):

	2020		2019		2018
Purchase activity
Asarco LLC	$	233.9	$	37.6	$	37.2
AMMINCO		18.6		17.8		8.0
Eolica El Retiro, S.A.P.I. de C.V.		1.0		2.9		3.6
Ferrocarril Mexicano, S.A. de C.V.		45.8		44.1		41.7
Grupo Mexico		10.0		10.0		10.1
MGE		213.3		202.2		200.1
Mexico Compania Constructora S.A de C.V.		42.6		60.3		72.9
Grupo Mexico Servicios de Ingenieria, S.A. de C.V.		11.1		10.7		6.9
Total purchases	$	576.3	$	385.6	$	380.5
Sales activity
Asarco LLC	$	77.9	$	11.3	$	81.8
AMMINCO		0.1		0.1		0.3
Ferrocarril Mexicano, S.A. de C.V.		—		0.1		—
MGE		54.9		47.4		68.2
Total sales	$	132.9	$	58.9	$	150.3

Grupo Mexico, the parent and the majority indirect stockholder of the Company, and its affiliates provide various services to the Company. These services are primarily related to accounting, legal, tax, financial, treasury, human resources, price risk assessment and hedging, purchasing, procurement and logistics, sales and administrative and other support services. The Company pays Grupo Mexico and AMMINCO, a subsidiary of Grupo Mexico, for these services and expects to continue requiring these services in the future.

In 2020 and 2019, the Company donated $7.1 million and $9.6 million, respectively, to Fundacion Grupo Mexico,A.C., an organization dedicated to promoting the social and economic development of the communities close to the Company’s Mexican operations.

The Company’s Mexican operations paid fees for freight services provided by Ferrocarril Mexicano, S.A de C.V. and for construction services provided by Mexico Compania Constructora S.A. de C.V., which are all subsidiaries of Grupo Mexico. Additionally, the Company´s Peruvian and Mexican operations paid fees for engineering services provided by Grupo Mexico Servicios de Ingenieria, S.A. de C.V., a subsidiary of Grupo Mexico.

The Company’s Mexican operations purchased copper concentrate and anodic slimes from Asarco LLC and also paid fees for tolling services. Additionally, the Company´s Mexican operations purchased power from MGE. Both companies are subsidiaries of Grupo Mexico.

In 2012, the Company signed a power purchase agreement with MGE, whereby MGE will supply some of the Company’s Mexican operations with power through 2032. MGE has two natural gas-fired combined cycle power generating units, with a net total capacity of 516.2 megawatts and has been supplying power to the Company since December 2013. Currently, MGE is supplying 2.3% of its power output to third-party energy users; compared to 5.2% at December 31, 2019.

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In 2014, Mexico Generadora de Energia Eolica, S. de R.L. de C.V, an indirect subsidiary of Grupo Mexico, located in Oaxaca, Mexico, acquired Eolica el Retiro, a windfarm with 37 wind turbines. This company started operations in January 2014 and began to sell power to Industrial Minera Mexico, S.A. de C.V. and subsidiaries (IMMSA) and other subsidiaries of Grupo Mexico in the third quarter of 2014. Currently, Eolica el Retiro is supplying approximately 9.6% of its power output to IMMSA; compared to 18.2% at December 31, 2019.

The Company sold copper concentrate as well as sulfuric acid, silver and gold to Asarco LLC. In addition, in 2020 and 2019, the Company´s Mexican operations received rental fees from AMMINCO. In 2018, the Company´s Mexican operations sold vehicles to AMMINCO. In 2019, the Company´s Mexican operations sold an asset to Ferrocarril Mexicano, S.A. de C.V.

In September 2019, Asarco LLC signed a promissory agreement to pay to the Company´s Mexican operations $62.0 million plus interest no later than October 31, 2021, with quarterly payments of $0.5 million. The annual interest rate of the note was Libor plus 200 basis points, which would be reviewed annually. In November 2020, Asarco repaid this agreement. Related to this agreement, the Company recorded interest income of $2.2 and $2.3 million in 2020 and 2019, respectively.

The Company also received fees for natural gas and services provided to MGE, a subsidiary of Grupo Mexico. In May 2020, MGE signed a promissory note to pay to the Company´s Mexican operations 97.2 million Mexican pesos (approximately $5.1 million) plus interest. The annual interest rate of the note was 8.28% with monthly payments. MGE repaid this note in December 2020.

Companies with relationships with the controlling group:

The following table summarizes the purchase and sales activities with other Larrea family companies in 2020, 2019 and 2018 (in millions):

	2020		2019		2018
Purchase activity
Boutique Bowling de Mexico S.A. de C.V.	$	0.4	$	0.4	$	0.3
Mextransport		3.5		2.3		12.4
Operadora de Cinemas S.A. de C.V.		0.2		0.2		0.2
Total purchases	$	4.1	$	2.9	$	12.9
Sales activity
Boutique Bowling de Mexico S.A. de C.V.	$	0.1	$	0.1	$	0.2
Empresarios Industriales de Mexico, S.A. de C.V.		—		0.2		—
Mextransport		1.7		1.8		1.2
Operadora de Cinemas S.A. de C.V.		0.1		0.1		0.1
Total sales	$	1.9	$	2.2	$	1.5

The Larrea family controls a majority of the capital stock of Grupo Mexico, and has extensive interests in other businesses, including transportation, real estate and entertainment. The Company engages in certain transactions in the ordinary course of business with other entities controlled by the Larrea family relating to the lease of office space, air transportation and entertainment.

The Company’s Mexican operations paid fees for entertainment services provided by Boutique Bowling de Mexico S.A de C.V. and Operadora de Cinemas S.A. de C.V. Both companies are controlled by the Larrea family.

MexTransport provides aviation services to the Company’s Mexican operations. This is a company controlled by the Larrea family.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

In addition, the Company received fees for building rental and maintenance services provided to Boutique Bowling de Mexico S.A de C.V. and Operadora de Cinemas S.A. de C.V. The Company´s Mexican operations received fees from Mextransport for reimbursement of maintenance expenses and for rental services. In 2019, The Company´s Mexican operations received fees for security services provided to Empresarios Industriales de Mexico, S.A. de C.V. This is also a company controlled by the Larrea family.

Equity Investment in Affiliate: The Company has a 44.2% participation in Compañia Minera Coimolache S.A. (“Coimolache”), which it accounts for on the equity method. Coimolache owns Tantahuatay, a gold mine located in northern Peru.

In addition, the Company has a 30.0% participation in Apu Coropuna S.R.L. (“Apu Coropuna”), which it accounts for

on the equity method. Apu Coropuna is a company, which undertakes exploration activities in the Pucay prospect, located in Arequipa, Peru.

It is anticipated that in the future the Company will enter into similar transactions with these same parties.

Companies with relationships with SCC executive officers:

In 2020, 2019 and 2018, the Company engaged in no purchase or sales activities with companies that have relationships with SCC executive officers.

NOTE 18—SEGMENT AND RELATED INFORMATION:

Company management views Southern Copper as having three reportable segments and manages it on the basis of these segments. The reportable segments identified by the Company are: the Peruvian operations, the Mexican open-pit operations and the Mexican underground mining operations segment identified as the IMMSA unit.

The three reportable segments identified are groups of mines, each of which constitute an operating segment, with similar economic characteristics, type of products, processes and support facilities, similar regulatory environments, similar employee bargaining contracts and similar currency risks. In addition, each mine within the individual group earns revenues from similar type of customers for their products and services and each group incurs expenses independently, including commercial transactions between groups.

Intersegment sales are based on arm’s length prices at the time of sale. These may not be reflective of actual prices realized by the Company due to various factors, including additional processing, timing of sales to outside customers and transportation cost. Added to the segment data is information regarding the Company’s sales. The segments identified by the Company are:

1. Peruvian operations, which include the Toquepala and Cuajone mine complexes and the smelting and refining plants, including a precious metals plant, industrial railroad and port facilities that service both mines. The Peruvian operations produce copper, with production of by-products of molybdenum, silver and other material.

2. Mexican open-pit operations, which include La Caridad and Buenavista mine complexes and the smelting and refining plants, including a precious metals plant and a copper rod plant and support facilities that service both mines. The Mexican open-pit operations produce copper, with production of by-products of molybdenum, silver and other material.

3. Mexican underground mining operations, which include five underground mines that produce zinc, copper, silver and gold, and a zinc refinery. This group is identified as the IMMSA unit.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

The Peruvian operations include two open-pit copper mines whose mineral output is transported by rail to Ilo, Peru where it is processed at the Company’s Ilo smelter and refinery, without distinguishing between the products of the two mines. The resulting product, anodes and refined copper, are then shipped to customers throughout the world. These shipments are recorded as revenue of the Company’s Peruvian mines.

The Mexican open-pit segment includes two copper mines whose mineral output is processed in the same smelter and refinery without distinguishing between the products of the two mines. The resultant product, anodes and refined copper, are then shipped to customers throughout the world. These shipments are recorded as revenues of the Company’s Mexican open-pit mines.

The Company has determined that it is necessary to classify the Peruvian open-pit operations as an operating segment that is separate from the Mexican open-pit operations due to the very distinct regulatory and political environments in which they operate. The Company’s Chief Operating Decision Maker (“CODM”) must consider the operations in each country separately when analyzing results of the Company and making key decisions. The open-pit mines in Peru must comply with stricter environmental rules and must deal with a political climate that has a very distinct vision of the mining industry than that seen in Mexico. In addition, the collective bargaining agreement contracts are negotiated differently in each of the countries. These key differences result in the Company taking varying decisions with regard to open-pit operations in the two countries.

The IMMSA segment includes five mines whose minerals are processed in the same refinery. Sales of product from this segment are recorded as revenues of the Company’s IMMSA unit. While the Mexican underground mines are subject to a regulatory environment that is very similar to that applicable to Mexican open-pit mines, the nature of the products and processes of the two Mexican operations vary considerably. These differences cause the Company’s CODM to take a very different approach when analyzing results and making decisions regarding the two Mexican operations.

Financial information is regularly prepared for each of the three segments and the results of the Company’s operations are regularly reported to the CODM on the segment basis. The CODM of the Company focuses on operating income and on total assets as measures of performance to evaluate different segments and to make decisions to allocate resources to the reported segments. These are common measures in the mining industry.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

Financial information relating to Company’s segments is as follows:

	Year Ended December 31, 2020
	(in millions)
			Mexican				Corporate, other
	Mexican		IMMSA		Peruvian		and
	Open-pit		Unit		Operations		eliminations		Consolidated
Net sales outside of segments	$	4,412.4	$	418.9	$	3,153.6	$	—	$	7,984.9
Intersegment sales				111.0				(111.0)		—
Cost of sales (exclusive of depreciation, amortization and depletion)		1,991.6		383.0		1,679.5		(124.3)		3,929.8
Selling, general and administrative		70.5		9.5		37.6		8.6		126.2
Depreciation, amortization and depletion		366.7		42.5		328.7		37.7		775.6
Exploration		2.5		8.6		9.4		12.1		32.6
Operating income	$	1,981.1	$	86.3	$	1,098.4	$	(45.1)		3,120.7
Less:
Interest, net										(347.4)
Other income (expense)										(27.5)
Income taxes										(1,174.4)
Equity earnings of affiliate										6.4
Non-controlling interest										(7.4)
Net income attributable to SCC									$	1,570.4
Capital investment	$	317.1	$	72.1	$	195.0	$	8.0	$	592.2
Property and mine development, net	$	4,470.5	$	548.2	$	3,735.1	$	704.9	$	9,458.7
Total assets	$	7,236.1	$	967.2	$	5,169.9	$	3,573.3	$	16,946.5

	Year Ended December 31, 2019
	(in millions)
			Mexican				Corporate, other
	Mexican		IMMSA		Peruvian		and
	Open-pit		Unit		Operations		eliminations		Consolidated
Net sales outside of segments	$	3,963.9	$	381.6	$	2,940.1	$	—	$	7,285.6
Intersegment sales		—		83.2		—		(83.2)		—
Cost of sales (exclusive of depreciation, amortization and depletion)		1,613.1		380.3		1,702.1		(89.1)		3,606.4
Selling, general and administrative		78.6		7.9		38.5		6.8		131.8
Depreciation, amortization and depletion		351.9		52.3		328.1		32.1		764.4
Exploration		1.8		9.0		16.5		2.7		30.0
Operating income	$	1,918.5	$	15.3	$	854.9	$	(35.7)		2,753.0
Less:
Interest, net										(319.5)
Other income (expense)										(7.0)
Income taxes										(945.3)
Equity earnings of affiliate										10.7
Non-controlling interest										(6.1)
Net income attributable to SCC									$	1,485.8
Capital investment	$	244.3	$	106.3	$	350.1	$	6.8	$	707.5
Property and mine development, net	$	4,648.5	$	497.1	$	3,879.2	$	346.2	$	9,371.0
Total assets	$	8,081.9	$	837.6	$	5,017.9	$	2,470.0	$	16,407.4

155

SOUTHERN COPPER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

	Year Ended December 31, 2018
	(in millions)
			Mexican				Corporate, other
	Mexican		IMMSA		Peruvian		and
	Open-pit		Unit		Operations		eliminations		Consolidated
Net sales outside of segments	$	4,075.9	$	448.6	$	2,572.2	$	—	$	7,096.7
Intersegment sales		—		79.3		—		(79.3)		—
Cost of sales (exclusive of depreciation, amortization and depletion)		1,611.0		377.2		1,509.4		(88.6)		3,409.0
Selling, general and administrative		55.3		8.5		36.7		2.1		102.6
Depreciation, amortization and depletion		360.4		47.6		237.4		28.9		674.3
Exploration		2.0		5.3		18.5		3.8		29.6
Operating income	$	2,047.2	$	89.3	$	770.2	$	(25.5)		2,881.2
Less:
Interest, net										(261.1)
Other income (expense)										(30.7)
Income taxes										(1,053.5)
Equity earnings of affiliate										12.3
Non-controlling interest										(5.2)
Net income attributable to SCC									$	1,543.0
Capital investment	$	266.8	$	60.0	$	774.0	$	20.6	$	1,121.4
Property and mine development, net	$	4,783.8	$	448.3	$	3,797.2	$	374.5	$	9,403.8
Total assets	$	8,165.2	$	930.2	$	4,813.1	$	379.1	$	14,287.6

The following table presents information regarding the opening and closing balances of receivables by reporting segment of the Company for the three years ended December 31, 2020 (in millions):

			Mexican
	Mexican		IMMSA		Peruvian		Corporate &
	Open-Pit		Unit		Operations		Elimination		Consolidated
As of December 31, 2020:
Trade receivables	$	566.0	$	57.8	$	445.1	$	—	$	1,068.9
Related parties, current		15.4		—		0.8		7.1		23.3
As of December 31, 2019:
Trade receivables	$	477.8	$	38.0	$	317.1	$	—	$	832.9
Related parties, current		22.1		—		—		7.9		30.0
Related parties, non-current		59.5		—		—		—		59.5
As of December 31, 2018:
Trade receivables	$	505.9	$	50.5	$	266.0	$	—	$	822.4
Related parties		81.6		—		—		19.9		101.5

156

SOUTHERN COPPER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

SALES VALUE PER SEGMENT:

The following table presents information regarding the sales value by reporting segment of the Company’s significant products for the three years ended December 31, 2020 (in millions):

	Year Ended December 31, 2020
			Mexican
	Mexican		IMMSA		Peruvian		Corporate, Other &		Total
	Open-pit		Unit		Operations		Eliminations		Consolidated
Copper	$	3,762.1	$	72.1	$	2,727.3	$	(48.4)	$	6,513.1
Molybdenum		275.2		—		235.1		—		510.3
Zinc		—		247.8		—		1.6		249.4
Silver		235.5		155.8		112.0		(55.5)		447.8
Other		139.6		54.2		79.2		(8.7)		264.3
Total	$	4,412.4	$	529.9	$	3,153.6	$	(111.0)	$	7,984.9

	Year Ended December 31, 2019
			Mexican
	Mexican		IMMSA		Peruvian		Corporate, Other &		Total
	Open-pit		Unit		Operations		Eliminations		Consolidated
Copper	$	3,314.9	$	42.0	$	2,535.3	$	(46.9)	$	5,845.3
Molybdenum		341.0		—		208.4		—		549.4
Zinc		—		280.1		—		(2.3)		277.8
Silver		185.9		82.7		85.6		(29.9)		324.3
Other		122.1		60.0		110.8		(4.1)		288.8
Total	$	3,963.9	$	464.8	$	2,940.1	$	(83.2)	$	7,285.6

	Year Ended December 31, 2018
			Mexican
	Mexican		IMMSA		Peruvian		Corporate, Other &		Total
(in millions)	Open-pit		Unit		Operations		Eliminations		Consolidated
Copper	$	3,459.1	$	45.6	$	2,251.2	$	(48.1)	$	5,707.8
Molybdenum		342.5		—		167.4		—		509.9
Zinc		—		328.7		—		(0.1)		328.6
Silver		175.3		83.5		69.5		(28.1)		300.2
Other		99.0		70.1		84.1		(3.0)		250.2
Total	$	4,075.9	$	527.9	$	2,572.2	$	(79.3)	$	7,096.7

157

SOUTHERN COPPER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

NET SALES AND GEOGRAPHICAL INFORMATION:

The geographic breakdown of the Company’s sales for the three years ended December 31, 2020 was as follows (in millions):

	Year Ended December 31, 2020
			Mexican
	Mexican		IMMSA		Peruvian		Corporate &
	Open-Pit		Unit		Operations		Elimination		Consolidated
The Americas:
Mexico	$	1,296.6	$	341.1	$	—	$	(111.0)	$	1,526.7
United States		1,182.8		27.2		153.4		—		1,363.4
Peru		—		13.0		322.0		—		335.0
Brazil		—		18.7		214.3		—		233.0
Chile		18.8		—		202.3		—		221.1
Other American countries		36.8		2.9		2.7		—		42.4
Europe:
Switzerland		898.2		69.9		475.2		—		1,443.3
Italy		0.1		9.5		262.0		—		271.6
Spain		199.4		—		—		—		199.4
Other European countries		199.9		40.2		281.6		—		521.7
Asia:
Singapore		319.9		6.9		536.9		—		863.7
Japan		46.9		—		532.6		—		579.5
Other Asian countries		213.0		0.5		170.6				384.1
Total	$	4,412.4	$	529.9	$	3,153.6	$	(111.0)	$	7,984.9

	Year Ended December 31, 2019
			Mexican
	Mexican		IMMSA		Peruvian		Corporate &
	Open-Pit		Unit		Operations		Elimination		Consolidated
The Americas:
Mexico	$	1,262.2	$	352.9	$	—	$	(83.2)	$	1,531.9
United States		1,054.9		6.2		134.5		—		1,195.6
Peru		1.6		—		338.4		—		340.0
Brazil		—		17.3		194.4		—		211.7
Chile		1.2		—		190.1		—		191.3
Other American countries		37.6		2.2		3.3		—		43.1
Europe:
Switzerland		780.9		36.7		355.8		—		1,173.4
Italy		45.1		13.3		238.6		—		297.0
Spain		186.1		—		—		—		186.1
Other European countries		92.8		24.9		256.9		—		374.6
Asia:
Singapore		345.4		10.4		611.1		—		966.9
Japan		59.9		—		440.9		—		500.8
Other Asian countries		96.2		0.9		176.1		—		273.2
Total	$	3,963.9	$	464.8	$	2,940.1	$	(83.2)	$	7,285.6

158

SOUTHERN COPPER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

	Year Ended December 31, 2018
			Mexican
	Mexican		IMMSA		Peruvian		Corporate &
	Open-Pit		Unit		Operations		Elimination		Consolidated
The Americas:
Mexico	$	1,343.0	$	385.6	$	—	$	(79.3)	$	1,649.3
United States		1,008.0		6.6		244.0		—		1,258.6
Peru		—		—		390.4		—		390.4
Brazil		—		43.8		228.1		—		271.9
Chile		—		—		136.3		—		136.3
Other American countries		60.6		3.8		1.4		—		65.8
Europe:
Switzerland		453.3		43.4		156.7		—		653.4
Italy		20.6		21.7		305.0		—		347.3
Spain		169.4		—		—		—		169.4
Other European countries		234.8		19.9		124.9		—		379.6
Asia:
Singapore		528.8		2.2		538.2		—		1,069.2
Japan		71.8		—		411.6		—		483.4
Other Asian countries		185.6		0.9		35.6		—		222.1
Total	$	4,075.9	$	527.9	$	2,572.2	$	(79.3)	$	7,096.7

PROVISIONAL SALES PRICE:

At December 31, 2020, the Company has recorded provisionally priced sales of copper at average forward prices per pound, and molybdenum at the year-end market price per pound. These sales are subject to final pricing based on the average monthly copper prices on the London Metal Exchange (“LME”) or New York Commodities Exchange (“COMEX”) and Dealer Oxide molybdenum prices in the future month of settlement.

Following are the provisionally priced copper and molybdenum sales outstanding at December 31, 2020:

	Sales volume	Priced at
	(million lbs.)	(per pound)	Month of settlement
Copper	139.8	3.52	January through April 2021
Molybdenum	12.9	10.03	January through March 2021

Provisional sales price adjustments included in accounts receivable and net sales were as follows at December, 31 (in millions):

	At December 31,
	2020		2019
Copper	$	17.4	$	4.0
Molybdenum		14.1		(8.2)
Total	$	31.5	$	(4.2)

Management believes that the final pricing of these sales will not have a material effect on the Company’s financial position or results of operations.

159

SOUTHERN COPPER CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

LONG-TERM SALES CONTRACTS:

The following are the significant outstanding long-term contracts:

In 2019, a three-year copper cathodes sales agreement was signed with Mitsui, with shipments beginning in 2020. Mitsui and the Company will negotiate market terms and conditions for annual contracts no later than November 30 of the year prior to shipment. The contract considers the following annual volumes of copper cathodes; 48,000 tons for each of the years from 2020 through 2022. Failure to reach an agreement on market terms would cancel the annual contract but not the long-term agreement. Under the terms of the agreement all shipments would be to Asia and no exclusivity rights for Mitsui or commissions are included. This contract may be renewed for additional years, upon the agreement of both parties.

Under the terms of a sales contract with Molymet Group (Molibdenos y Metales, S.A. and Sadaci N.V.), SPCC Peru Branch is required to supply approximately 70% of the molybdenum concentrates production from 2019 through 2022. The sale price of the molybdenum concentrate is based on the average of the High and Low “Daily Dealer Oxide” as published in “Platt’s Metals Daily”. The roasting charge deduction is agreed based on international market terms.

Under the terms of a sales contract with Molymex, S.A. de C.V., Operadora de Minas de Nacozari, S.A. de C.V. and Operadora de Minas e Instalaciones Mineras, S.A. de C. V. are required to supply at least the 80% of their molybdenum concentrates production from 2020 through 2023. The sale price of the molybdenum concentrate is based on the average of the High and Low “Daily Dealer Oxide” as published in “Platt’s Metals Daily.” The roasting charge deduction is negotiated based on international market terms.

NOTE 19—SUBSEQUENT EVENTS:

DIVIDENDS:

On January 21, 2021, the Board of Directors authorized a dividend of $0.60 per share to be paid on February 24, 2021, to shareholders of record at the close of business on February 10, 2021.

160

OTHER COMPANY INFORMATION:

ANNUAL MEETING

The annual stockholders meeting of Southern Copper Corporation will be held on Thursday, April 29, 2021, at 9:00 am, Mexico City time. To support the health and well-being of our employees and shareholders, this year’s meeting will be held solely virtually via a live audio webcast.

TRANSFER AGENT, REGISTRAR AND STOCKHOLDERS’ SERVICES

Computershare

480 Washington Boulevard

Jersey City, NJ 07310-1900

Phone: (866) 230-0172

DIVIDEND REINVESTMENT PROGRAM

SCC stockholders can have their dividends automatically reinvested in SCC common shares. SCC pays all administrative and brokerage fees. This plan is administered by Computershare. For more information, contact Computershare at (866) 230-0172.

STOCK EXCHANGE LISTING

The principal markets for SCC’s common stock are the NYSE and the Lima Stock Exchange (BVL). SCC’s common stock symbol is SCCO on both the NYSE and the Lima Stock Exchange.

OTHER SECURITIES

The Branch in Peru has issued, in accordance with Peruvian Law, “investment shares” (formerly named labor shares) that are quoted on the Lima Stock Exchange under symbols SPCCPI1 and SPCCPI2. Transfer Agent, registrar and stockholders services are provided by Credicorp Capital, Avenida EI Derby 055, Torre 4, Piso 10, Santiago de Surco, Cod postal 15039, Peru.

Telephone (51-1) 416-3333, Extensions 32478 and 32441.

OTHER CORPORATE INFORMATION

For other information on the Company or to obtain, free of charge, additional copies of the Annual Report on Form 10-K, contact the Investor Relations Department at:

1440 East Missouri Avenue, Suite 160 Phoenix, AZ 85014, USA

Telephone: (602) 264-1375

SOUTHERN COPPER CORPORATION

USA

1440 East Missouri Ave, Suite 160

Phoenix, AZ 85014, USA

Phone: (602) 264-1375

Fax: (602) 264-1397

Mexico

Campos Eliseos 400

Colonia Lomas de Chapultepec

161

Delegacion Miguel Hidalgo

C.P. 11000—MEXICO

Phone: (5255) 1103-5000

Fax: (5255) 1103-5567

Peru

Av. Caminos del Inca 171

Urb. Chacarilla del Estanque

Santiago de Surco

Cod postal 15038—PERU

Phone: (511) 512-0440 Ext 3181

Fax: (511) 512-0492

Website: www.southerncoppercorp.com

Email address: southerncopper@southernperu.com.pe

162

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANT ON ACCOUNTING AND FINANCIAL DISCLOSURE

Not applicable.

ITEM 9A. CONTROLS AND PROCEDURES

As of December 31, 2020, the Company conducted an evaluation under the supervision and with the participation of the Company’s disclosure committee and the Company’s management, including the Chief Executive Officer and Chief Financial Officer, of the effectiveness and the design and operation of the Company’s disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e). Based on that evaluation, the Chief Executive Officer and the Chief Financial Officer have concluded that the Company’s disclosure controls and procedures are effective as of December 31, 2020, to ensure that information required to be disclosed in reports filed or submitted under the Exchange Act is:

1. Recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and

2. Accumulated and communicated to management, including the Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

CHANGES IN INTERNAL CONTROL OVER FINANCIAL REPORTING

There were no changes in the Company’s internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934, as amended) that occurred during the fourth quarter ended December 31, 2020 that have materially affected, or are reasonably likely to materially affect, the Company’s internal controls over financial reporting,

MANAGEMENT’S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

Management is responsible for establishing and maintaining adequate internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Company.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness for future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with policies or procedures may deteriorate.

Under the supervision and with the participation of the Company’s management, including the Chief Executive Officer and Chief Financial Officer, the Company conducted an evaluation of the effectiveness of its internal control over financial reporting based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organization of the Treadway Commission. Based on the evaluation made under this framework, management concluded that as of December 31, 2020 such internal control over financial reporting is effective.

Our internal control over financial reporting as of December 31, 2020 has been audited by Galaz, Yamazaki, Ruiz Urquiza, S.C. member of Deloitte Touche Tohmatsu Limited, an independent registered public accounting firm, as stated in their report which is provided below.

163

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of Southern Copper Corporation

Opinion on Internal Control over Financial Reporting

We have audited the internal control over financial reporting of Southern Copper Corporation and subsidiaries (the “Company”) as of December 31, 2020, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2020, based on the criteria established in Internal Control—Integrated Framework (2013) issued by COSO.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements and financial statement schedule as of and for the year ended December 31, 2020 of the Company and our report dated February 25, 2021, expressed an unqualified opinion on those financial statements and financial statement schedule.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying “Management’s Report on Internal Control over Financial Reporting” appearing in Item 9A. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control over Financial Reporting

A Company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A Company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the Company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the Company are being made only in accordance with authorizations of management and directors of the Company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the Company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of the effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

164

Galaz, Yamazaki, Ruiz Urquiza, S.C.

Member of Deloitte Touche Tohmatsu Limited

/s/ DANIEL TOLEDO ANTONIO

C.P.C. Daniel Toledo Antonio

Mexico City, Mexico

February 25, 2021

ITEM 9B. OTHER INFORMATION

None.

165

PART III

ITEM 10, 11, 12, 13 AND 14

INFORMATION ABOUT OUR EXECUTIVE OFFICERS

Set forth below are the executive officers of the Company, their ages as of January 31, 2021 and their positions.

Name	Age	Position
German Larrea Mota‑Velasco	67	Chairman of the Board and Director
Oscar Gonzalez Rocha	82	President, Chief Executive Officer and Director
Raul Jacob Ruisanchez	62	Vice President, Finance, Treasurer and Chief Financial Officer
Julian Jorge Lazalde Psihas	52	Secretary
Andres Carlos Ferrero Ghislieri	52	General Counsel
Lina Vingerhoets Vilca	59	Comptroller
Edgard Corrales Aguilar	65	Vice President, Exploration
Raul Vaca Castro	61	General Auditor

German Larrea Mota-Velasco has served as our Chairman of the Board since December 1999, Chief Executive Officer from December 1999 to October 2004 and as a member of our Board of Directors since November 1999. He has been Chairman of the board of directors, President and Chief Executive Officer of Grupo Mexico (holding) since 1994. Mr. Larrea has been Chairman of the board of directors and Chief Executive Officer of Grupo Ferroviario Mexicano S.A. de C.V (railroad company) since 1997. Mr. Larrea was previously Executive Vice Chairman of Grupo Mexico and has been a member of the board of directors since 1981. He is also Chairman of the board of directors and Chief Executive Officer of Empresarios Industriales de Mexico, S.A. de C.V. (holding) and Fondo Inmobiliario (real estate company), since 1992. He founded Grupo Impresa, a printing and publishing company in 1978, remaining as the Chairman and Chief Executive Officer until 1989 when the company was sold. He is a director of the Consejo Mexicano de Negocios since 1999, was a director of Banco Nacional de Mexico, S.A. (Citigroup) from 1992 to 2015 and Grupo Televisa, S.A.B. from 1999 to 2014.

Oscar Gonzalez Rocha has served as our President since December 1999 and our President and Chief Executive Officer since October 21, 2004. He has been our Director since November 1999. Mr. Gonzalez Rocha has been the President and Chief Executive Officer of Americas Mining Corporation since November 1, 2014 and the Chief Executive Officer and a director of Asarco LLC (integrated U.S. copper producer), an affiliate of the Company, since August 2010. Previously, he was our President and General Director and Chief Operating Officer from December 1999 to October 20, 2004. He has been a director of Grupo Mexico since 2002. He was General Director of Mexicana de Cobre, S.A. de C.V. from 1986 to 1999 and of Buenavista del Cobre S.A. de C.V. (formerly Mexicana de Cananea, S.A. de C.V.) from 1990 to 1999. He was an alternate director of Grupo Mexico from 1988 to April 2002. Mr. Gonzalez Rocha is a civil engineer with a degree from the Autonomous National University of Mexico (“UNAM”) in Mexico City, Mexico. Mr. Gonzalez Rocha has been recognized as Copper man of the year 2015 and was inducted into the American Mining Hall of Fame in December 2016 in Tucson, Arizona and into the Mexican Mining Hall of Fame in October 2017 in Guadalajara, Mexico.

Raul Jacob Ruisanchez has served as our Vice President, Finance and Chief Financial Officer since April 18, 2013. He was appointed Treasurer of the Company on April 28, 2016. He was our Comptroller from October 27, 2011 until April 18, 2013. He has held various positions focused primarily in financial planning, treasury, corporate finance, investor relations and project evaluation with the Company since 1992. In September 2011, he was appointed Director of Controller and Finance of the Company’s Peruvian Branch and Vice President and Chief Financial Officer of Southern Peru Limited, one of our subsidiaries. During the period 2016 – 2019, Mr. Jacob was considered by Institutional Investor among the top three Chief Financial Officers of the mining industry of Latin America. In 2010, he was ranked among the top three Investor Relations executives of the mining industry of Latin America by the same publication. He is currently President of the Peruvian National Mining, Oil and Energy Association. Mr. Jacob is currently a member of the consulting board of the MBA program (Finance) of the Universidad del Pacifico in Lima, Peru. Until March of 2010, he was President of the Strategic Studies Center of IPAE, an entrepreneurial association. Between 2004 and 2006, he was the President of the Finance Affairs Committee of the American Chamber of Commerce of Peru. Mr. Jacob holds an economics degree from Universidad del Pacifico, a Master’s Degree from the University of Texas (Austin), a Degree in

166

International Business Management from the Stockholm School of Economics and a Senior Manager Degree by the Instituto de Empresa Business School (IE) in Madrid.

Julian Jorge Lazalde Psihas, our Secretary, has been a Director, Executive Vice President and General Counsel of Asarco LLC since December 2009. Since October 2015 he is also General Counsel of Americas Mining Corporation, both subsidiaries of Grupo Mexico, S.A.B. de C.V., the parent company of the Company. Mr. Lazalde was General Counsel of Asarco Inc., the predecessor of Asarco LLC, from September 2006 until December 2009. Mr. Lazalde holds a law degree from the Autonomous Institute of Mexico, known as ITAM, and has degrees from the Panamerican University in two special areas, tax law and commercial law.

Andres Carlos Ferrero Ghislieri, our General Counsel, has been a member of the Legal Department of our Peruvian Branch since December 1995. Prior to this, he served as a Technical Advisor to the World Bank’s Energy and Mines Technical Assistance Loan Project (EMTAL) assigned to the National Society of Mining, Energy and Petroleum. He has also worked as a mining law consultant for the South African Government from May to October 2001. He was elected Superintendent of the Legal Affairs and Legal Manager of the Peruvian Branch in March 2008 and July 2016 respectively. He is a member of the Board of Compañía Minera Los Tolmos, S.A. and Secretary of the Board of Ocoña Hydro, S.A., which are subsidiaries of the Company. He is also a Board member of Inversiones Tulipan, S. A., which is an affiliate of the Company. He holds a law degree from the University of Lima, Peru and a Master of Law or LLM degree in Resources Law and Policy from Dundee University, United Kingdom.

Lina Vingerhoets Vilca, our Comptroller, has been the Assistant Comptroller of the Company since April 2015 and Controller of the Peruvian Branch of the Company since July 2015. Ms. Vingerhoets has worked for the Company’s Peruvian Branch in various capacities since 1991. From 2013 to 2015, she was in charge of Internal Control. From 2006 to 2015, she was in charge of Accounting Quality and SEC reporting. In addition, she has held other positions in Financial Planning, Finance and Accounting with the Company’s Peruvian Branch. Ms. Vingerhoets is a Peruvian certified public accountant and holds Accounting and MBA degrees from the Universidad del Pacifico, in Lima, Peru.

Edgard Corrales Aguilar has served as Vice President, Exploration since July 18, 2013. Mr. Corrales has been working with the Peruvian Branch of SCC since 1983 in various positions, including as senior geologist of the Toquepala mine, head of the geology department of the Cuajone mine and manager of the exploration department of the Peruvian Branch of SCC. Currently he is Exploration Director of the Peruvian Branch of SCC and general manager of SCC’s Branch in Chile. Mr. Corrales has a degree in geology and engineering from the Universidad Nacional San Agustin, Arequipa, Peru and has followed specialized studies at the Catholic University of Caracas, Venezuela and the MacKay School of Mines at the University of Reno, Nevada. He has also completed extensive studies in management at various universities in Peru.

Raul Vaca Castro was elected as General Auditor, effective July 18, 2019. He has 33 years of experience with Grupo Mexico. Mr. Vaca Castro has been Director of Internal Audit of Minera México, a subsidiary of SCC since 2018. Previously, he was Director of Internal Audit of the infrastructure division of Grupo Mexico, as well as Deputy Director of Internal Control for the mining division of Grupo México. He was also comptroller of Minera Mexico Internacional and before this, he held several positions in different companies of Grupo Mexico. Mr. Vaca holds a bachelor’s degree in Accounting from the Universidad Nacional Autonoma de Mexico (UNAM). He holds an MBA from the Universidad del Valle de México, with a specialization in finance, having earned an honorable mention award, when receiving his diplomas in finance and taxes. Mr. Vaca is also an active member of the Colegio de Contadores Publicos de Mexico and the Institute of Internal Auditors of Mexico. He is also member of the Technical Commission of Internal Audit of the Colegio de Contadores Publicos de Mexico. He was a professor at the Facultad de Contaduria y Administracion of Universidad Nacional Autonoma de Mexico (UNAM).

Information in response to the additional disclosure requirements specified by Part III, Items 10, 11, 12, 13 and 14 will be included in a definitive proxy statement, which will be filed pursuant to Regulation 14A of the 1934 Securities Exchange Act, as amended, prior to April 30, 2021, or will be provided by amendment to this Form 10-K, also to be filed no later than April 30, 2021.

The information contained in such definitive proxy statement is incorporated herein by reference, excluding the information under the caption “Compensation Committee Report,” which shall not be deemed filed.

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PART IV.

ITEM 15. EXHIBITS, FINANCIAL STATEMENTS, SCHEDULE.

The following documents are filed as part of this report:

1. Financial Statements

The following financial statements of Southern Copper Corporation and its subsidiaries are included at the indicated pages of the document as stated below:

	Form 10-K Pages
Report of Independent Registered Public Accounting Firm	100
Consolidated statements of earnings for the years ended December 31, 2020, 2019 and 2018	104
Consolidated statements of comprehensive income for the years ended December 31, 2020, 2019 and 2018	105
Consolidated balance sheets at December 31, 2020 and 2019	106
Consolidated statements of cash flows for the years ended December 31, 2020, 2019 and 2018	107
Consolidated statements of changes in equity for the years ended December 31, 2020, 2019 and 2018	108
Notes to the consolidated financial statements	109 - 160

2. Exhibits:

3.1	(a) Amended and Restated Certificate of Incorporation, filed on October 11, 2005.
	(b) Certificate of Amendment of Amended and Restated Certificate of Incorporation dated May 2, 2006.
	(c) Certificate of Amendment of Amended and Restated Certificate of Incorporation dated May 28, 2008.
3.2	By-Laws, as last amended on July 23, 2020.
4.1	(a) Indenture governing $600 million 7.500% Notes due 2035, by and among Southern Copper Corporation, The Bank of New York and The Bank of New York (Luxembourg) S.A.
	(b) Indenture governing $400 million 7.500% Notes due 2035, by and among Southern Copper Corporation, The Bank of New York, and The Bank of New York (Luxembourg) S.A.
4.2	Form of 6.375% Note (included in Exhibit 4.1).
4.3	Form of New 7.500% Note (included in Exhibit 4.2(a)).
4.4	Form of New 7.500% Note (included in Exhibit 4.2(b)).
4.5	Indenture, dated as of April 16, 2010, between Southern Copper Corporation and Wells Fargo Bank, National Association, as trustee, pursuant to which $1.1 billion of 6.750% Notes due 2040 were issued.
4.6	Second Supplemental Indenture, dated as of April 16, 2010, between Southern Copper Corporation and Wells Fargo Bank, National Association, as trustee, pursuant to which the 6.750% Notes due 2040 were issued.
4.7	Form of 6.750% Notes due 2040.
4.8	Third Supplemental Indenture, dated as of November 8, 2012, between Southern Copper Corporation and Wells Fargo Bank, National Association, as trustee, pursuant to which the 3.500% Notes due 2022 were issued.
4.9	Fourth Supplemental Indenture, dated as of November 8, 2012, between Southern Copper Corporation and Wells Fargo Bank, National Association, as trustee, pursuant to which the 5.250% Notes due 2042 were issued.
4.10	Form of 3.500% Notes due 2022.
4.11	Form of 5.250% Notes due 2042.
4.12	Fifth Supplemental Indenture dated as of April 23, 2015, between Southern Copper Corporation and Wells Fargo Bank, National Association, as trustee, pursuant to which the 3.875% Notes due 2025 were issued.
4.13	Sixth Supplemental Indenture, dated as of April 23, 2015, between Southern Copper Corporation and Wells Fargo Bank, National Association, as trustee, pursuant to which the 5.875% Notes due 2045 were issued.

168

4.14	Form of 3.875% Notes due 2025.
4.15	Form of 5.875% Notes due 2045.
4.16	Description of the Company’s securities registered pursuant to Section 12 of the Securities Exchange Act of 1934, as amended.
10.1	Directors’ Stock Award Plan of the Company, as amended through January 28, 2023.
10.2	Agreement and Plan of Merger, dated as of October 21, 2004, by and among Southern Copper Corporation, SCC Merger Sub, Inc., Americas Sales Company, Inc., Americas Mining Corporation and Minera Mexico S.A. de C.V.
10.3	Tax Agreement entered into by the Company and Americas Mining Corporation, effective as of February 20, 2017.
14.0	Code of Business Conduct and Ethics adopted by the Board of Directors on May 8, 2003 and amended on April 23, 2015.
21.1	Subsidiaries of the Company.
23.1	Consent of Registered Public Accounting Firm (Galaz, Yamazaki, Ruiz Urquiza, S.C., Member of Deloitte Touche Tohmatsu, Limited).
31.1	Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C., Section 1350. This document is being furnished in accordance with SEC Release No. 33-8328.
32.2	Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C., Section 1350. This document is being furnished in accordance with SEC Release No. 33-8328.
101.INS	XBRL Instance Document (submitted electronically with this report). The instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	XBRL Taxonomy Extension Schema Document (submitted electronically with this report).
101.CAL	XBRL Taxonomy Calculation Linkbase Document (submitted electronically with this report).
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document (submitted electronically with this report).
101.LAB	XBRL Taxonomy Label Linkbase Document (submitted electronically with this report).
101.PRE	XBRL Taxonomy Presentation Linkbase Document (submitted electronically with this report).
104	Cover page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

The exhibit listed as 10.1 is the management contract or compensatory plan or arrangement required to be filed pursuant to Item 15(b) of Form 10-K.

Attached as Exhibit 101 to this report are the following documents formatted in Inline XBRL (Inline Extensible Business Reporting Language): (i) the Consolidated Statements of Earnings for the years ended December 31, 2020, 2019 and 2018; (ii) the Consolidated Statements of Comprehensive Income for the years ended December 31, 2020, 2019 and 2018; (iii) the Consolidated Balance Sheets at December 31, 2020 and 2019; (iv) the Consolidated Statements of Cash Flows for the years ended December 31, 2020, 2019 and 2018; (v) the Consolidated Statements of changes in equity for the years ended December 31, 2020, 2019 and 2018, and (vi) the Notes to Consolidated Financial Statements tagged in detail. Users of this data are advised pursuant to Rule 406T of Regulation S-T that this interactive data file is deemed not filed or part of a registration statement or prospectus for purposes of sections 11 or 12 of the Securities Act of 1933, is deemed not filed for purposes of section 18 of the Securities Exchange Act of 1934, and otherwise is not subject to liability under these sections.

169

3.    Schedule II

Valuation and Qualifying Accounts and Reserves (in millions):

	Additions
	Balance at		Charged to
	beginning of		costs and		Deduction/	Balance at
	period		expenses	Additions	Application	end of period
Reserve deducted in balance sheet to which applicable:
Accounts Receivable:
2020	$	0.5	8.5	—	(0.2)	$	8.8
2019	$	0.5	—	—	—	$	0.5
2018	$	1.1	—	—	(0.6)	$	0.5
Notes issued under par:
2020	$	69.6	2.0	—	—	$	67.6
2019	$	58.8	1.9	12.7	—	$	69.6
2018	$	60.5	1.7	—	—	$	58.8
Valuation allowance:
2020	$	1,097.0	246.2	—	—	$	1,343.2
2019	$	819.1	277.9	—	—	$	1,097.0
2018	$	619.6	199.5	—	—	$	819.1

170

Supplemental information

Southern Copper Corporation

Exhibit Index

Sequential Exhibit Number	Document Description	Page Number
3.1	(a) Amended and Restated Certificate of Incorporation, filed on October 11, 2005. (Filed as Exhibit 3.1 to the Company’s Quarterly Report on Form 10-Q for the third quarter of 2005 and incorporated herein by reference).
	(b) Certificate of Amendment of Amended and Restated Certificate of Incorporation dated May 2, 2006. (Filed as Exhibit 3.1 to Registration Statement on Form S-4, File No. 333-135170, filed on June 20, 2006 and incorporated herein by reference).
	(c) Certificate of Amendment of Amended and Restated Certificate of Incorporation dated May 28, 2008. (Filed as Exhibit 3.1 to the Company’s Quarterly Report on Form 10-Q for the second quarter of 2008 and incorporated herein by reference).
3.2	By-Laws, as last amended on July 23, 2020. (Filed as Exhibit 3.2 to the Company’s Form 8-K filed on July 28, 2020 and incorporated herein by reference).
4.1	(a) Indenture governing $600 million 7.500% Notes due 2035, by and among Southern Copper Corporation, The Bank of New York and The Bank of New York (Luxembourg) S.A. (Filed as Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on August 1, 2005 and incorporated herein by reference).
	(b) Indenture governing $400 million 7.500% Notes due 2035, by and among Southern Copper Corporation, The Bank of New York, and The Bank of New York (Luxembourg) S.A. (Filed as Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on August 1, 2005 and incorporated herein by reference).
4.2	Form of 6.375% Note (included in exhibit 4.1).
4.3	Form of New 7.500% Note (included in Exhibit 4.2(a)).
4.4	Form of New 7.500% Note (included in Exhibit 4.2(b))
4.5	Indenture, dated as of April 16, 2010, between Southern Copper Corporation and Wells Fargo Bank, National Association, as trustee, pursuant to which $1.1 billion of 6.750% Notes due 2040 were issued. (Filed as Exhibit 4.1 to the Company’s Current Report on Form 8-K filed on April 19, 2010 and incorporated herein by reference).
4.6	Second Supplemental Indenture, dated as of April 16, 2010, between Southern Copper Corporation and Wells Fargo Bank, National Association, as trustee, pursuant to which the 6.750% Notes due 2040 were issued. (Filed as an Exhibit to the Company’s Current Report on Form 8-K filed on April 19, 2010 and incorporated herein by reference).
4.7	Form of 6.750% Notes due 2040. (Filed as an Exhibit to the Company’s Current Report on Form 8-K filed on April 19, 2010 and incorporated herein by reference).
4.8	Third Supplemental Indenture, dated as of November 8, 2012, between Southern Copper Corporation and Wells Fargo Bank, National Association, as trustee, pursuant to which the 3.500% Notes due 2022 were issued (Filed as an Exhibit to the Company’s Current Report on Form 8-K filed on November 9, 2012 and incorporated herein by reference).
4.9	Fourth Supplemental Indenture, dated as of November 8, 2012, between Southern Copper Corporation and Wells Fargo Bank, National Association, as trustee, pursuant to which the 5.250% Notes due 2042 were issued. (Filed as an Exhibit to the Company’s Current Report on Form 8-K filed on November 9, 2012 and incorporated herein by reference).
4.10	Form of 3.500% Notes due 2022. (Filed as an Exhibit to the Company’s Current Report on Form 8-K filed on November 9, 2012 and incorporated herein by reference).
4.11	Form of 5.250% Notes due 2042. (Filed as an Exhibit to the Company’s Current Report on Form 8-K filed on November 9, 2012 and incorporated herein by reference).

171

4.12	Fifth Supplemental Indenture dated as of April 23, 2015, between Southern Copper Corporation and Wells Fargo Bank, National Association, as trustee, pursuant to which the 3.875% Notes due 2025 were issued. (Filed as an Exhibit to the Company’s Current Report on Form 8-K filed on April 24, 2015 and incorporated herein by reference).
4.13	Sixth Supplemental Indenture, dated as of April 23, 2015, between Southern Copper Corporation and Wells Fargo Bank, National Association, as trustee, pursuant to which the 5.875% Notes due 2045 were issued. (Filed as an Exhibit to the Company’s Current Report on Form 8-K filed on April 24, 2015 and incorporated herein by reference).
4.14	Form of 3.875% Notes due 2025. (Filed as Exhibit A to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed on April 24, 2015 and incorporated herein by reference).
4.15	Form of 5.875% Notes due 2045. (Filed as Exhibit A to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed on April 24, 2015 and incorporated herein by reference).
4.16	Description of the Company’s securities registered pursuant to Section 12 of the Securities Exchange Act of 1934, as amended (Filed herewith).
10.1	Directors’ Stock Award Plan of the Company, as amended through January 28, 2023. (Filed as an exhibit to the Company’s 2018 Proxy Statement and incorporated herein by reference). The plan expired by its terms on January 30, 2017. A 5-year extension of the plan was approved by the Company’s stockholders at the 2018 Annual Meeting of Stockholders.
10.2	Agreement and Plan of Merger, dated as of October 21, 2004, by and among Southern Copper Corporation, SCC Merger Sub, Inc., Americas Sales Company, Inc., Americas Mining Corporation and Minera Mexico S.A. de C.V. (Filed as an Exhibit to Current Report on Form 8-K filed on October 22, 2004 and incorporated herein by reference).
10.3	Tax Agreement entered into by the Company and Americas Mining Corporation, effective as of February 20, 2017. (Filed as Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q for the first quarter of 2017 and incorporated herein by reference).
14.0	Code of Business Conduct and Ethics adopted by the Board of Directors on May 8, 2003 and amended on April 23, 2015. (Filed as Exhibit 14 to the Company’s Current Report on Form 8-K filed April 29, 2015 and incorporated herein by reference).
21.1	Subsidiaries of the Company (Filed herewith).
23.1	Consent of Registered Public Accounting Firm (Galaz, Yamazaki, Ruiz Urquiza, S.C.—Member of Deloitte Touche Tohmatsu, Limited) (Filed herewith).
31.1	Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (Filed herewith).
31.2	Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (Filed herewith).
32.1	Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C., section 1350. This document is being furnished in accordance with SEC Release No. 33-8238.
32.2	Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C., section 1350. This document is being furnished in accordance with SEC Release No. 33-8238.
101.INS	XBRL Instance Document (submitted electronically with this report). The instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	XBRL Taxonomy Extension Schema Document (submitted electronically with this report).
101.CAL	XBRL Taxonomy Calculation Linkbase Document (submitted electronically with this report).
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document (submitted electronically with this report).
101.LAB	XBRL Taxonomy Label Linkbase Document (submitted electronically with this report).
101.PRE	XBRL Taxonomy Presentation Linkbase Document (submitted electronically with this report).
104	Cover Page Interactive Data File (formatted in Inline XBRL and contained in Exhibit 101)

The exhibit listed as 10.1 is the management contract or compensatory plan or arrangement required to be filed pursuant to Item 15(b) of Form 10-K.

172

Attached as Exhibit 101 to this report are the following documents formatted in Inline XBRL (Inline Extensible Business Reporting Language): (i) the Consolidated Statements of Earnings for the years ended December 31, 2020, 2019 and 2018; (ii) the Consolidated Statements of Comprehensive Income for the years ended December 31, 2020, 2019 and 2018; (iii) the Consolidated Balance Sheets at December 31, 2020 and 2019; (iv) the Consolidated Statements of Cash Flows for the years ended December 31, 2020, 2019 and 2018; (v) the Consolidated Statements of changes in equity for the years ended December 31, 2020, 2019 and 2018, and (vi) the Notes to Consolidated Financial Statements tagged in detail. Users of this data are advised pursuant to Rule 406T of Regulation S-T that this interactive data file is deemed not filed or part of a registration statement or prospectus for purposes of sections 11 or 12 of the Securities Act of 1933, is deemed not filed for purposes of section 18 of the Securities Exchange Act of 1934, and otherwise is not subject to liability under these sections.

173

Signatures

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized.

SOUTHERN COPPER CORPORATION
(Registrant)
By:	/s/ OSCAR GONZALEZ ROCHA
	Oscar Gonzalez Rocha
	President and Chief Executive Officer

Date: February 25, 2021

Pursuant to requirements of the Securities Exchange Act of 1934, this Report on Form 10-K has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

/s/ GERMAN LARREA MOTA-VELASCO	Chairman of the Board, and Director
German Larrea Mota-Velasco
/s/ OSCAR GONZALEZ ROCHA	President, Chief Executive Officer and Director
Oscar Gonzalez Rocha
/s/ RAUL JACOB RUISANCHEZ	Vice President, Finance, Treasurer and Chief Financial Officer (Principal Financial Officer)
Raul Jacob Ruisanchez
/s/ LINA A. VINGERHOETS VILCA	Comptroller (Principal Accounting Officer)
Lina A. Vingerhoets Vilca
DIRECTORS
s/ GERMAN LARREA MOTA-VELASCO	/s/ OSCAR GONZALEZ ROCHA
German Larrea Mota-Velasco	Oscar Gonzalez Rocha
/s/ RAFAEL MAC GREGOR ANCIOLA	/s/ VICENTE ARIZTEGUI ANDREVE
Rafael Mac Gregor Anciola	Vicente Ariztegui Andreve
/s/ ALFREDO CASAR PEREZ	/s/ L. MIGUEL PALOMINO BONILLA
Alfredo Casar Perez	L. Miguel Palomino Bonilla
/s/ GILBERTO PEREZALONSO CIFUENTES	/s/ ENRIQUE CASTILLO SANCHEZ MEJORADA
Gilberto Perezalonso Cifuentes	Enrique Castillo Sanchez Mejorada
/s/ CARLOS RUIZ SACRISTAN	/s/ XAVIER GARCIA DE QUEVEDO
Carlos Ruiz Sacristan	Xavier Garcia de Quevedo

Date: February 25, 2021

174

EX-4.16

Exhibit 4.16

DESCRIPTION OF THE REGISTRANT’S SECURITIES

REGISTERED PURSUANT TO SECTION 12 OF THE

SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

Southern Copper Corporation only has shares of Common Stock registered under Section 12 of the Securities Exchange Act of 1934, as amended.

Description of Common Stock

The description of our Common Stock is incorporated by reference from the description of Common Stock of the Company as set forth in Registration Statement No. 333-203237 on Form S-3 effective April 3, 2015. Said description is a summary and does not purport to be complete. It is subject to and qualified in its entirety by reference to our Amended and Restated Certificate of Incorporation, as amended and our Amended Bylaws, each of which are incorporated by reference as an exhibit to the Annual Report on Form 10-K of which this Exhibit 4.16 is a part. We encourage you to read our Certificate of Incorporation, our Bylaws and the applicable provisions of the Delaware General Corporation Law.

EX-21.1

Exhibit 21.1

SOUTHERN COPPER CORPORATION

Subsidiaries

(More than 50% ownership)

		Percentage of voting
		Securities owned or
Name of Company		other bases of control
PARENT:	Americas Mining Corporation (Delaware)
Registrant:	Southern Copper Corporation (Delaware)
	Americas Sales Company, Inc.(Delaware)	100.00
	Minera Mexico, S.A. de C.V. (Mexico)	99.96
	Buenavista del Cobre, S.A de C.V. (Mexico)	100.00
	Mexicana de Cobre, S.A. de C.V. (Mexico)	98.20
	Operadora de Minas e Instalaciones Mineras, S.A. de C.V.(Mexico)	100.00
	Metalurgica de Cobre, S.A. de C.V. (Mexico)	100.00

Not included in this listing are subsidiaries, which would not constitute a significant subsidiary.

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Post-Effective Amendment No.3 to Registration Statement No. 333-150982 on Form S-8, of our reports dated February 25, 2021, relating to the financial statements of Southern Copper Corporation (the “Company”), and the effectiveness of the Company´s internal control over financial reporting, appearing in the Annual Report on Form 10-K for the year ended December 31, 2020.

Galaz, Yamazaki, Ruiz Urquiza, S.C.

Member of Deloitte Touche Tohmatsu Limited

/s/ DANIEL TOLEDO ANTONIO

C.P.C. Daniel Toledo Antonio

Mexico City, Mexico

February 25, 2021

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

Section 302 of the Sarbanes-Oxley Act of 2002

I, Oscar Gonzalez Rocha certify that:

1. I have reviewed this report on Form 10-K of Southern Copper Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15 (e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s fourth fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

February 25, 2021

/s/ OSCAR GONZALEZ ROCHA

Oscar Gonzalez Rocha

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO

Section 302 of the Sarbanes-Oxley Act of 2002

I, Raul Jacob, certify that:

1. I have reviewed this report on Form 10-K of Southern Copper Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15 (e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s fourth fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

February 25, 2021

/s/ RAUL JACOB

Raul Jacob

Vice President, Finance, Treasurer and

Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Southern Copper Corporation (the “Company”) on Form 10-K for the period ending December 31, 2020 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Oscar Gonzalez Rocha, President and Chief Executive Officer of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ OSCAR GONZALEZ ROCHA

Oscar Gonzalez Rocha

President and Chief Executive Officer

February 25, 2021

A signed original of this written statement required by section 906 has been provided to Southern Copper Corporation and will be retained by Southern Copper Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Southern Copper Corporation (the “Company”) on Form 10-K for the period ending December 31, 2020 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Raul Jacob, Vice President, Finance, Treasurer and Chief Financial Officer of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ RAUL JACOB

Raul Jacob

Vice President, Finance, Treasurer and

Chief Financial Officer

February 25, 2021

A signed original of this written statement required by section 906 has been provided to Southern Copper Corporation and will be retained by Southern Copper Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Feb. 24, 2021	Jun. 30, 2020
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	1-14066
Entity Registrant Name	SOUTHERN COPPER CORP/
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-3849074
Entity Address, Address Line One	1440 East Missouri Avenue Suite 160
Entity Address, City or Town	Phoenix
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85014
City Area Code	602
Local Phone Number	264-1375
Title of 12(b) Security	Common stock
Trading Symbol	SCCO
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	true
Entity Common Stock, Shares Outstanding		773,073,269
Entity Public Float			$ 3,411.6
Entity Central Index Key	0001001838
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false

XML

CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CONSOLIDATED STATEMENTS OF EARNINGS
Net sales (including sales to related parties, see note 17)	$ 7,984.9	$ 7,285.6	$ 7,096.7
Operating cost and expenses:
Cost of sales (exclusive of depreciation, amortization and depletion shown separately below)	3,929.8	3,606.4	3,409.0
Selling, general and administrative	126.2	131.8	102.6
Depreciation, amortization and depletion	775.6	764.4	674.3
Exploration	32.6	30.0	29.6
Total operating costs and expenses	4,864.2	4,532.6	4,215.5
Operating income	3,120.7	2,753.0	2,881.2
Interest expense	(393.4)	(372.9)	(360.9)
Capitalized interest	26.8	32.2	83.8
Other income (expense)	(27.5)	(7.0)	(30.7)
Interest income	19.2	21.2	16.0
Income before income taxes	2,745.8	2,426.5	2,589.4
Income taxes (including royalty taxes, see Note 7)	1,237.9	966.3	1,105.0
Deferred income taxes	(63.5)	(21.0)	(51.5)
Net income before equity earnings of affiliate	1,571.4	1,481.2	1,535.9
Equity earnings of affiliate, net of income tax	6.4	10.7	12.3
Net income	1,577.8	1,491.9	1,548.2
Less: Net income attributable to the non-controlling interest	7.4	6.1	5.2
Net income attributable to SCC	$ 1,570.4	$ 1,485.8	$ 1,543.0
Per common share amounts attributable to SCC:
Net earnings-basic and diluted	$ 2.03	$ 1.92	$ 2.00
Weighted average shares outstanding-basic and diluted	773.1	773.1	773.0

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income and comprehensive income	$ 1,577.8	$ 1,491.9	$ 1,548.2
Other comprehensive income (loss) net of tax:
-Decrease (increase) in pension and other post-retirement benefits (net of income tax of $(1.9), $3.7 and $2.1, respectively)	1.7	(7.7)	(2.9)
Total other comprehensive income (loss)	1.7	(7.7)	(2.9)
Total comprehensive income	1,579.5	1,484.2	1,545.3
Comprehensive income attributable to the non-controlling interest	7.4	6.1	5.2
Comprehensive income attributable to SCC	$ 1,572.1	$ 1,478.1	$ 1,540.1

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Decrease (increase) in pension and other post-retirement benefits, income tax	$ (1.9)	$ 3.7	$ 2.1

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 2,183.6	$ 1,925.1
Short-term investments	410.8	80.7
Accounts receivable trade	1,068.9	832.9
Accounts receivable other (including related parties 2020- $23.3 and 2019 - $30.0)	67.7	78.9
Inventories	950.2	1,068.5
Prepaid taxes	104.8	172.4
Other current assets	29.2	26.2
Total current assets	4,815.2	4,184.7
Property and mine development, net	9,458.7	9,371.0
Ore stockpiles on leach pads	1,125.0	1,230.3
Intangible assets, net	143.0	148.4
Related parties receivable		59.5
Right-of-use assets	979.0	1,046.4
Deferred income tax	230.0	183.9
Equity method investment	114.3	111.9
Other non-current assets	81.3	71.3
Total assets	16,946.5	16,407.4
Current liabilities:
Current portion of long-term debt		399.8
Accounts payable (including related parties 2020- $104.3 and 2019- $86.4)	594.6	598.3
Accrued income taxes	340.9	116.3
Accrued workers' participation	247.8	174.9
Accrued interest	98.6	96.0
Lease liabilities current	70.6	68.6
Other accrued liabilities	32.3	22.6
Total current liabilities	1,384.8	1,476.5
Long-term debt, net of current portion	6,544.2	6,541.0
Lease liabilities	908.4	977.8
Deferred income taxes	159.4	178.3
Non-current taxes payable		0.7
Other liabilities and reserves	128.7	112.6
Asset retirement obligation	545.0	262.3
Total non-current liabilities	8,285.7	8,072.7
Commitments and contingencies (Note 13)
STOCKHOLDERS' EQUITY (NOTE 14)
Common stock par value $0.01; shares authorized, 2020 and 2019-2,000; shares issued, 2020 and 2019-884.6	8.8	8.8
Additional paid-in capital	3,441.5	3,424.9
Retained earnings	6,846.4	6,435.6
Accumulated other comprehensive income	(8.4)	(10.1)
Treasury stock, at cost, common shares	(3,063.5)	(3,048.9)
Total Southern Copper Corporation stockholders' equity	7,224.8	6,810.3
Non-controlling interest	51.2	47.9
Total equity	7,276.0	6,858.2
Total liabilities and equity	$ 16,946.5	$ 16,407.4

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2020	Dec. 31, 2019
CONDENSED CONSOLIDATED BALANCE SHEETS
Accounts receivable other, related parties	$ 23.3	$ 30.0
Accounts payable, related parties	$ 104.3	$ 86.4
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	2,000.0	2,000.0
Common stock, shares issued	884.6	884.6

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING ACTIVITIES
Net income	$ 1,577.8	$ 1,491.9	$ 1,548.2
Adjustments to reconcile net earnings to net cash provided from operating activities:
Depreciation, amortization and depletion	775.6	764.4	674.3
Equity earnings of affiliate, net of dividends received	(10.4)	(6.3)	(3.9)
Loss on foreign currency transaction effect	0.9	17.9	17.3
Benefit for deferred income taxes	(63.5)	(21.0)	(51.5)
Other, net	19.5	12.0	27.0
Change in operating assets and liabilities:
(Increase) decrease in accounts receivable	(236.0)	(10.5)	68.3
Decrease (increase) in inventories	223.6	(88.7)	(190.8)
Increase (decrease) in accounts payable and accrued liabilities	313.8	(184.9)	117.8
Decrease (increase) in other operating assets and liabilities	182.3	(62.9)	28.4
Net cash provided by operating activities	2,783.6	1,911.9	2,235.1
INVESTING ACTIVITIES
Capital expenditures	(592.2)	(707.5)	(1,121.4)
Purchase of short-term investments	(450.3)	(284.4)	(310.6)
Proceeds on sale of short-term investment	120.2	417.5	147.3
Other, net	6.5	0.4	(11.5)
Net cash used in investing activities	(915.8)	(574.0)	(1,296.2)
FINANCING ACTIVITIES
Repayments of debt	(400.0)
Proceeds from issuance of debt		987.3
Capitalization of debt issuance cost		(9.8)
Cash dividends paid to common stockholders	(1,159.6)	(1,236.9)	(1,082.3)
SCC shareholder derivative lawsuit - received from AMC		(36.5)
SCC shareholder derivative lawsuit - dividend paid		36.5
Distributions to non-controlling interest	(4.1)	(3.2)	(1.5)
Other, net	0.4	0.4	0.4
Net cash used in financing activities	(1,563.3)	(262.2)	(1,083.4)
Effect of exchange rate changes on cash and cash equivalents	(46.0)	4.8	(15.7)
Increase (decrease) in cash and cash equivalents	258.5	1,080.5	(160.2)
Cash and cash equivalents, at beginning of year	1,925.1	844.6	1,004.8
Cash and cash equivalents, at end of year	2,183.6	1,925.1	844.6
Cash paid during the year for:
Interest	383.5	356.7	356.7
Income taxes	1,037.1	1,138.7	1,155.3
Workers' participation	153.9	224.5	194.0
Supplemental schedule of non-cash operating, investing and financing activities:
Decrease (increase) in pension and other post-retirement benefits	1.7	(7.7)	(2.9)
Capital expenditures incurred but not yet paid	$ 32.2	$ 2.1	$ 37.7

XML

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	CAPITAL STOCK:	ADDITIONAL PAID-IN CAPITAL:	TREASURY STOCK: Southern Copper common shares	TREASURY STOCK: Parent Company (Grupo Mexico) common shares	TREASURY STOCK:	RETAINED EARNINGS:	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS):	STOCKHOLDERS' EQUITY	NON-CONTROLLING INTEREST	Total
Balance at beginning of year at Dec. 31, 2017		$ 3,373.3	$ (2,768.7)	$ (232.4)		$ 5,726.2	$ 0.5	$ 6,107.7	$ 41.7	$ 6,149.4
Increase (Decrease) in Stockholders' Equity
Net earnings						1,543.0			5.2	1,543.0
Dividends/distributions declared and paid						(1,082.3)			(1.5)
Used for corporate purposes			0.4
Other activity, including dividend, interest and foreign currency transaction effect				(18.9)
Other activity of the period		20.4
Other comprehensive income (loss)							(2.9)			(2.9)
Balance at end of year at Dec. 31, 2018	$ 8.8	3,393.7	(2,768.3)	(251.3)	$ (3,019.6)	6,186.9	(2.4)	6,567.4	45.4	6,612.8
Increase (Decrease) in Stockholders' Equity
Net earnings						1,485.8			6.1	1,485.8
Dividends/distributions declared and paid						(1,236.9)			(3.6)
SCC shareholder derivative lawsuit - received from AMC						36.5				36.5
SCC shareholder derivative lawsuit - dividend paid						(36.5)				(36.5)
Used for corporate purposes			0.4
Other activity, including dividend, interest and foreign currency transaction effect				(29.7)
Other activity of the period		31.2				(0.2)
Other comprehensive income (loss)							(7.7)			(7.7)
Balance at end of year at Dec. 31, 2019	8.8	3,424.9	(2,767.9)	(281.0)	(3,048.9)	6,435.6	(10.1)	6,810.3	47.9	6,858.2
Increase (Decrease) in Stockholders' Equity
Net earnings						1,570.4			7.4	1,570.4
Dividends/distributions declared and paid						(1,159.6)			(4.1)
Used for corporate purposes			0.4
Other activity, including dividend, interest and foreign currency transaction effect				(15.0)
Other activity of the period		16.6
Other comprehensive income (loss)							1.7			1.7
Balance at end of year at Dec. 31, 2020	$ 8.8	$ 3,441.5	$ (2,767.5)	$ (296.0)	$ (3,063.5)	$ 6,846.4	$ (8.4)	$ 7,224.8	$ 51.2	$ 7,276.0

XML

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
RETAINED EARNINGS:
Dividends paid as cash dividend (in dollars per share)	$ 1.50	$ 1.60	$ 1.40

XML

DESCRIPTION OF THE BUSINESS:

12 Months Ended

Dec. 31, 2020

DESCRIPTION OF THE BUSINESS:

DESCRIPTION OF THE BUSINESS:

NOTE 1—DESCRIPTION OF THE BUSINESS:

The Company is a majority-owned, indirect subsidiary of Grupo Mexico S.A.B. de C.V. (“Grupo Mexico”). At December 31, 2020, Grupo Mexico through its wholly-owned subsidiary Americas Mining Corporation (“AMC”) owned 88.9% of the Company’s capital stock. The consolidated financial statements presented herein consist of the accounts of Southern Copper Corporation ("SCC", "Southern Copper" or the “Company”), a Delaware corporation, and its subsidiaries. The Company is an integrated producer of copper and other minerals, and operates mining, smelting and refining facilities in Peru and Mexico. The Company conducts its primary operations in Peru through a registered branch (the "Peruvian Branch" or “Branch” or “SPCC Peru Branch”). The Peruvian Branch is not a corporation separate from the Company. The Company's Mexican operations are conducted through subsidiaries. The Company also conducts exploration activities in Argentina, Chile, Ecuador, Mexico and Peru.

COVID – 19 PANDEMIC

Since the World Health Organization (“WHO”) declared the COVID-19 virus outbreak as a global pandemic, all the countries where the Company operates and conducts exploration activities, as well as the countries where its main customers and suppliers are located, have published health and safety rules and restrictions on individuals and business activities.

As of December 31, 2020, the Company‘s production facilities in Mexico and Peru were working at approximately 98% of their production capacity. The Company has developed a rigorous COVID-19 emergency protocol.

The Company has restarted exploration activities at all of its locations, except in Chile due to local restrictions. The Company restarted exploration activities in Ecuador and Argentina in September 2020 and at the end of the second quarter of 2020, respectively.

The financial reporting process and the information required to prepare the Company’s financial statements suffered no interruption and the financial statements were prepared without restrictions or difficulties.

SCC´s Corporate Crisis Committee as well as its Crisis Committees in Mexico and Peru continue to closely monitor the impact of the pandemic and to analyze and quickly resolve any issues that may arise. As of December 31, 2020, there were no major delays in the supply of materials and services critical for the operations and sales. Also, shipments and collections have registered no known major delays.

After completing the first stage of its capital programs at Buenavista in Mexico and Toquepala in Peru, the Company currently does not have major capital expenditures commitments (see Note 13 - Commitments and Contingencies). The Company paid the first tranche of its 2010 bonds of $400 million on April 15, 2020. The Company has no other major debt maturity until 2022.

The Company performed a qualitative analysis and as of December 31, 2020 identified no indicators of impairment. As the Company reported, the results of its impairment sensitivity analysis showed projected discounted cash flows in excess of the carrying amounts of long-lived assets by margins ranging from 1.3 to 4.3 times such carrying amount. This analysis included a stress test using a copper price assumption of $2.00 per pound and a molybdenum price assumption of $4.00 per pound.

XML

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

12 Months Ended

Dec. 31, 2020

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

NOTE 2—SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

Principles of consolidation—

The consolidated financial statements include the accounts of subsidiaries of which the Company has voting control, in accordance with Accounting Standards Codification (“ASC”) 810 Consolidation. Such financial statements are prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP").

Use of estimates—

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include the carrying value of ore reserves that are the basis for future cash flow estimates and amortization calculations; environmental reclamation, closure and retirement obligations; estimates of recoverable copper in mill and leach stockpiles; asset impairments (including estimates of future cash flows); unrecognized tax benefits; valuation allowances for deferred tax assets; and fair value of financial instruments. Management bases its estimates on the Company's historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Actual results could differ from those estimates.

Revenue recognition—

The Company accounts for a contract with a customer when there is a legally enforceable contract between the Company and the customer, the rights of the parties are identified, the contract has commercial substance, and collectability of the contract consideration is probable. The Company's revenues are measured based on consideration specified in the contract with each customer. Disclosures regarding disaggregation of revenues and contract balances are disclosed within Note 18 "Segment and related information".

The Company’s marketing strategy and annual sales planning emphasize developing and maintaining long-term customer relationships. Generally, 80% to 90% of the Company’s metal production is sold under annual or longer-term contracts, which specify a volume of mineral to be sold over a stated period and delivery schedule; the price at which mineral will be sold at each delivery date is generally determined by the weekly or monthly average rate of the commodity published by major metal exchanges at specific dates stipulated within each contract. The Company considers each contract to be a single performance obligation, represented by the delivery of a series of distinct goods that are substantially the same, with the same pattern of transfer to the Company’s customers. The Company concluded this as, based on the nature of its contracts, customers receive the benefit of mineral sold as it is shipped per the terms of the contracts at each contractual delivery date. Likewise, each shipment of product represents the same measure of progress as other shipments within the contract. Accordingly, the Company recognizes revenues for each contract over the period of time in which the specified quantity of mineral is delivered. In doing so, the Company considers that it has a right to consideration from its customers in an amount that corresponds directly to the value transferred to those customers that being the quantity of mineral delivered at the price per unit delivered. Accordingly, the Company recognizes revenue at the amount to which it has the right to invoice (the invoice practical expedient), as it believes that this method is a faithful depiction of the transfer of goods to its customers.

For contracts with a term greater than one year, the Company is unable to disclose an allocation of the transaction price to the remaining unsatisfied performance obligation, given that unit prices of mineral sold are determined by published commodity prices at specified dates within the contract. The volume of mineral to be delivered after the first year of the contract is subject to annual volume negotiations in accordance with the terms of the contract. As of December 31, 2020, the Company has long-term contracts with promises to deliver in 2021 for a total of 208,000 metric tons of copper concentrate, 48,000 metric tons of copper cathodes, 43,329 tons of molybdenum concentrate and 325,700 tons of sulfuric

acid. This is an estimate that will vary in 2022 and 2023 based on the negotiations with the customers as mentioned above.

The remainder of the Company’s revenues, including its by-product revenues, are generated by spot sales that are recognized at a point in time.

Under both sales models, revenue is recognized when or as the performance obligations are satisfied, when the Company transfers control of the goods and title passes to the customer. Considering the International Commercial Terms (Incoterms) utilized by the Company, control is transferred generally upon the completion of loading the material at the point of origin. This is the point at which the customer obtains legal title to the product as well as the ability to direct the use of and obtain substantially all of the remaining benefits of ownership of the asset. Additionally, payment is generally due upon the delivery of the shipping and title documents at the point of origin, customers typically have 30 days to remit payment. Copper and non-copper revenues are measured based on the monthly average of prevailing commodity prices according to the terms of the contracts. The Company provides allowances for doubtful accounts based upon historical bad debt and claims experience and periodic evaluation of specific customer accounts.

Substantially all of the Company’s sales are made under carriage and insurance paid to, or cost, insurance and freight Incoterms, whereby the Company is responsible for providing shipping and insurance after control of the inventory has been transferred to the customer. According to the terms of the Company’s contracts, these services are not distinct within the context of the contract, and they are not separately identifiable from the other promises within the contract. Additionally, it is the Company policy and it has a long-standing history of providing shipping and insurance services to its customers. Accordingly, shipping and insurance are not considered separate performance obligations. The related costs of shipping and insurance are presented within the cost of sales line in the accompanying consolidated statements of income.

Furthermore, the Company considered the impact of the shipping and insurance services on the determination of when control is transferred to its customers. It has concluded that the terms of these services do not impact its customers’ ability to sell, pledge, or otherwise use the products in shipment. Also, there is a small likelihood and minimal history of lost or damaged goods during shipment. Considering these factors, combined with the other indicators of control previously mentioned, the Company has concluded that these services do not impact the determination that control is transferred at the point of origin.

For certain of the Company’s sales of copper and molybdenum products, customer contracts allow for pricing based on a month subsequent to shipping, in most cases within the following three months and occasionally in some cases a few additional months. In such cases, revenue is recorded at a provisional price at the time of shipment. The provisionally priced copper sales are adjusted to reflect forward LME or COMEX copper prices at the end of each month until a final adjustment is made to the price of the shipments upon settlement with customers pursuant to the terms of the contract. In the case of molybdenum sales, for which there are no published forward prices, the provisionally priced sales are adjusted to reflect the market prices at the end of each month until a final adjustment is made to the price of the shipments upon settlement with customers pursuant to the terms of the contract.

These provisional pricing arrangements are accounted for separately from the contract as an embedded derivative instrument under ASC 815-30 “Derivatives and Hedging—Cash Flow Hedges.” The Company sells copper in concentrate, anode, blister and refined form at industry standard commercial terms. Net sales include the invoiced value of copper, zinc, silver, molybdenum, sulfuric acid and other metals and the corresponding fair value adjustment of the related forward contract of copper and molybdenum. Disclosure regarding adjustments to sales for provisionally priced contracts is disclosed within Note 18 “Segment and related information”.

Cash and cash equivalents—

Cash and cash equivalents include bank deposits, certificates of deposit and short-term investment funds with original maturities of three months or less at the date of purchase. The carrying value of cash and cash equivalents approximates fair value.

Short-term investments—

The Company accounts for short-term investments in accordance with ASC 320-10 “Investments Debt and Equity Securities-Recognition.” The Company determines the appropriate classification of all short-term investments as held-to-maturity, available-for-sale or trading at the time of purchase and re-evaluates such classifications as of each balance sheet date. Unrealized gains and losses on available-for-sale investments, net of taxes, are reported as a component of accumulated other comprehensive income (loss) in stockholders’ equity, unless such loss is deemed to be other than temporary.

Inventories—

The Company principally produces copper and, in the production process, obtains several by-products, including molybdenum, silver, zinc, sulfuric acid and other metals.

Metal inventories, consisting of work-in-process and finished goods, are carried at the lower of average cost or net realizable value (NRV). Costs of work-in-process inventories and finished goods mainly include power, labor, fuel, operating and repair materials, depreciation, amortization, depletion, and other necessary costs related to the extraction and processing of ore, including mining, milling, concentrating, smelting, refining, leaching and chemical processing. Costs incurred in the production of metal inventories exclude general and administrative costs. Once molybdenum, silver, zinc and other by-products are identified, they are transferred to their respective production facilities and the incremental cost required to complete production is assigned to their inventory value.

Work-in-process inventories represent materials that are in the process of being converted into a saleable product. Conversion processes vary depending on the nature of the copper ore and the specific mining operation. For sulfide ores, processing includes milling and concentrating and results in the production of copper and molybdenum concentrates.

Finished goods include saleable products (e.g., copper concentrates, copper anodes, copper cathodes, copper rod, molybdenum concentrate and other metallurgical products).

Supplies inventories are carried at the lower of average cost or net realizable value (NRV).

Long-term inventory-Ore stockpiles on leach pads.

The leaching process is an integral part of the mining operations carried out at the Company’s open-pit mines. The Company capitalizes the production cost of leachable material at its Toquepala, La Caridad and Buenavista mines, recognizing it as inventory. This cost includes mining and haulage costs incurred to deliver ore to leach pads, depreciation, amortization, depletion and site overhead costs. The estimates of recoverable mineral content contained in the leaching dumps are supported by engineering studies. As the production cycle of the leaching process is significantly longer than the conventional process of concentrating, smelting and electrolytic refining, the Company includes current leach inventory (included in work-in-process inventories) and long-term leach inventory on its balance sheet. On January 1, 2020, the Company aligned its capitalization method for its Peruvian and Mexican operations to capitalize based on the allocation of copper content recoverable between ore and leach material. In addition, inventory consumption is now valued at the average unit cost, instead of the declining percentages of recovery method used previously. As a result of

these changes, during 2020 the value of capitalized material decreased by $196.4 million and consumption decreased by $29.3 million when compared to the previous capitalization method.

Management has evaluated ASC 250-10 and considered appropriate guidance to conclude that the aforementioned classifies as a change in accounting estimate, and therefore should affect accounting books prospectively. Management believes that this new method will result in a more accurate valuation of this material.

Property—

Property is recorded at acquisition cost, net of accumulated depreciation and amortization. Cost includes major expenditures for improvements and replacements, which extend useful lives or increase capacity and interest costs associated with significant capital additions. Maintenance, repairs, normal development costs at existing mines and gains or losses on assets retired or sold are reflected in earnings as incurred.

Buildings and equipment are depreciated on the straight-line method over estimated lives from two to 50 years or the estimated life of the mine if shorter.

Mine development—

Mine development includes primarily the cost of acquiring land rights to an exploitable ore body, pre-production stripping costs at new mines that are commercially exploitable, costs associated with bringing new mineral properties into production, and removal of overburden to prepare unique and identifiable areas outside the current mining area for such future production. Mine development costs are amortized on a unit of production basis over the remaining life of the mines.

Diverse practices exist in the mining industry relative to the treatment of drilling and other related costs to delineate new ore reserves. The Company follows the practices outlined in the next two paragraphs in its treatment of drilling and related costs.

Drilling and other associated costs incurred in the Company's efforts to delineate new resources, whether near-mine or Greenfield are expensed as incurred. These costs are classified as mineral exploration costs. Once the Company determines through feasibility studies that proven and probable reserves exist and that the drilling and other associated costs embody a probable future benefit that involves a capacity, singly or in combination with other assets, to contribute directly or indirectly to future net cash inflow, then the costs are classified as mine development costs. These mine development costs incurred prospectively to develop the property are capitalized as incurred, until the commencement of production, and are amortized using the units of production method over estimated life of the ore body. During the production stage, drilling and other related costs incurred to maintain production are included in production cost in the period in which they are incurred.

Drilling and other related costs incurred in the Company’s efforts to delineate a major expansion of reserves at an existing production property are expensed as incurred. Once the Company determines through feasibility studies that proven and probable incremental reserves exist and that the drilling and other associated costs embody a probable future benefit that involves a capacity, singly or in combination with other assets, to contribute directly or indirectly to future net cash inflow, then the costs are classified as mine development costs. These incremental mine development costs are capitalized as incurred, until the commencement of production and amortized using the units of production method over the estimated life of the ore body. A major expansion of reserves is one that increases total reserves at a property by approximately 10% or more.

For the years ended December 31, 2020, 2019 and 2018, the Company did not capitalize any drilling and related costs.

Asset retirement obligations (reclamation and remediation costs)—

The fair value of a liability for asset retirement obligations is recognized in the period in which the liability is incurred. The liability is measured at fair value and is adjusted to its present value in subsequent periods as accretion expense is recorded. The corresponding asset retirement costs are capitalized as part of the carrying value of the related long-lived assets and depreciated over the asset's useful life.

Intangible assets—

Intangible assets include primarily the excess amount paid over the book value for investment shares, which are presented as mining concessions, and mining and engineering development studies. Intangible assets are carried at acquisition costs, net of accumulated amortization and are amortized principally on a unit of production basis over the estimated remaining life of the mines. Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable.

Debt issuance costs—

Debt issuance costs related to a recognized debt liability are presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with the treatment of a debt discount.

Ore reserves—

The Company periodically reevaluates estimates of its ore reserves, which represent the Company’s estimate as to the amount of unmined copper remaining in its existing mine locations that can be produced and sold at a profit. Such estimates are based on engineering evaluations derived from samples of drill holes and other openings, combined with assumptions about copper market prices and production costs at each of the respective mines.

The Company updates its estimate of ore reserves at the beginning of each year. In this calculation, the Company uses current metal prices which are defined as the average metal price over the preceding three years. The current price per pound of copper, as defined, was $2.816, $2.818 and $2.642 at the end of 2020, 2019 and 2018, respectively. The ore reserve estimates are used to determine the amortization of mine development and intangible assets.

Once the Company determines through feasibility studies that proven and probable reserves exist and that drilling and other associated costs embody a probable future benefit that involves a capacity, singly or in combination with other assets, to contribute directly or indirectly to future net cash inflow, then the costs are classified as mine development costs and the Company discloses the related ore reserves.

Exploration—

Tangible and intangible costs incurred in the search for mineral properties are charged against earnings when incurred.

Income taxes—

Provisions for income taxes are based on taxes payable or refundable for the current year and deferred taxes on temporary differences between the amount of taxable income and pretax financial income and between the tax bases of assets and liabilities and their reported amounts in the financial statements. Deferred tax assets and liabilities are included in the financial statements at currently enacted income tax rates applicable to the period in which the deferred tax assets and liabilities are expected to be realized and settled as prescribed in ASC 740 “Income taxes.” As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

Deferred income tax assets are reduced by any benefits that, in the opinion of management, are more likely not to be realized.

The Company’s operations involve dealing with uncertainties and judgments in the application of complex tax regulations in multiple jurisdictions. The final taxes paid are dependent upon many factors, including negotiations with tax authorities in various jurisdictions and resolution of disputes arising from federal, state, and international tax audits. The Company recognizes potential liabilities and records tax liabilities for anticipated tax audit issues in the U.S. and other tax jurisdictions based on its estimate of whether, and the extent to which, additional taxes will be due. The Company follows the guidance of ASC 740 “Income taxes” to record these liabilities. (See Note 7 “Income taxes” of the consolidated financial statements for additional information). The Company adjusts these reserves in light of changing facts and circumstances; however, due to the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different from the Company’s current estimate of the tax liabilities. If its estimate of tax liabilities proves to be less than the ultimate assessment, an additional charge to expense would result. If payment of these amounts ultimately proves to be less than the recorded amounts, the reversal of the liabilities would result in tax benefits being recognized in the period when the Company determines the liabilities are no longer necessary.

The Company classifies income tax-related interest and penalties as income taxes in the financial statements, as well as interest and penalties, if any, related to unrecognized tax benefits.

Foreign exchange—

The Company’s functional currency is the U.S. dollar. As required by local law, both the Peruvian Branch and Minera Mexico maintain their books of accounts in Peruvian soles and Mexican pesos, respectively.

Foreign currency assets and liabilities are remeasured into U.S. dollars at current exchange rates, except for non-monetary items such as inventory, property, intangible assets and other assets which are remeasured at historical exchange rates. Revenues and expenses are generally translated at actual exchange rates in effect during the period, except for those items related to balance sheet amounts that are remeasured at historical exchange rates. Gains and losses from foreign currency remeasurement are included in earnings of the period.

Gains and (losses) resulting from foreign currency transactions are included in "Cost of sales (exclusive of depreciation, amortization and depletion)."

Asset impairments -

The Company evaluates long-term assets when events or changes in economic circumstances indicate that the carrying amount of such assets may not be recoverable. These evaluations are based on business plans that are prepared using a time horizon that is reflective of the Company’s expectations of metal prices over its business cycle. The Company is currently using a long-term average copper price and an average molybdenum price for impairment tests, reflective of what the Company believes is the lower level of the current price environment. The results of its impairment tests using these long-term copper and molybdenum prices show no impairment in the carrying value of their assets.

In recent years testing using assumptions for long-term average prices have resulted in stricter evaluation for impairment analysis than would the higher three year average prices for copper and molybdenum prices. Should this situation reverse in the future with three-year average prices below the long-term price assumption, the Company would assess the need to use the three-year average prices in its evaluations. The Company uses an estimate of the future undiscounted net cash flows of the related asset or asset group over the remaining life to measure whether the assets are recoverable and measures any impairment by reference to fair value.

Other comprehensive income—

Comprehensive income represents changes in equity during a period, except those resulting from investments by owners and distributions to owners. During the fiscal years ended December 31, 2020, 2019 and 2018, the components of "other comprehensive income (loss)" were, the unrecognized gain (loss) on employee benefit obligations and foreign currency translation adjustments.

Business segments-

Company management views Southern Copper as having three reportable segments and manages it on the basis of these segments. The segments identified by the Company are: 1) the Peruvian operations, which include the two open-pit copper mines in Peru and the plants and services supporting such mines, 2) the Mexican open-pit copper mines, which include La Caridad and Buenavista mine complexes and their supporting facilities and 3) the Mexican underground mining operations, which include five underground mines that produce zinc, lead, copper, silver and gold, a coal mine and a zinc refinery. Please see Note 18 “Segments and Related Information.”

The Chief Operating Decision Maker of the Company focuses on operating income as measure of performance to evaluate different segments, and to make decisions to allocate resources to the reported segments. This is a common measure in the mining industry.

Leases -

The Company adopted FASB ASC 842, Leases, effective January 1, 2019. The Company determined if a contract is or contained a lease at its inception. The Company evaluated if a contract gave the right to obtain substantially all of the economic benefits from use of an identified asset and the right to direct the use of the asset, in order to determine if a contract contained a lease. All of the Company’s existing lease contracts are operating lease contracts. For these leases, the Company recognized right-of-use assets and the corresponding operating lease liabilities on its consolidated balance sheet. Right-of-use assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent an obligation by the Company to make lease payments which arise from the lease. Lease right-of-use assets and liabilities are recognized at the inception date based on the present value of lease payments over the lease term. As the Company’s lease contracts do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the inception date in order to determine the present value of lease payments. Lease expense for lease payments is recognized on a straight-line basis over the lease term, in the cost of sales and operating expenses. The Company elected the transition approach whereby it applied the new leases standard at the adoption date and recognized a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company elected the short-term lease recognition exemption (short-term lease practical expedient) by class of underlying asset (which results in off-balance-sheet accounting for the lease).

ADOPTION OF CREDIT LOSSES STANDARD

In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-13: “Financial Instruments – Credit Losses (Topic 326)”. This ASU was adopted on January 1, 2020. Prior to adopting this ASU, the Company applied an impairment methodology for accounts receivable arising from revenue transactions within the scope of ASC 606 that is consistent with the provision matrix model contemplated in the new standard. In addition, the new disclosure requirements do not apply to such trade receivables because the collection periods in all cases are less than one year. The Company’s accounts receivable from related parties under common control are excluded from the scope of this ASU. Accordingly, the adoption of this ASU did not have a material impact on the Company’s financial statements or related disclosures.

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SHORT-TERM INVESTMENTS:

12 Months Ended

Dec. 31, 2020

SHORT-TERM INVESTMENTS:

SHORT-TERM INVESTMENTS:

NOTE 3—SHORT-TERM INVESTMENTS:

Short-term investments were as follows ($ in millions):

	At December 31,
	2020			2019
Trading securities	$	410.2		$	80.0
Weighted average interest rate		0.4	%		2.0	%
Available-for-sale	$	0.6		$	0.7
Weighted average interest rate		0.7	%		0.7	%
Total	$	410.8		$	80.7

Trading securities consist of bonds issued by public companies and are publicly traded. Each financial instrument is independent of the others. The Company has the intention to sell these bonds in the short-term.

Available-for-sale investments consist of securities issued by public companies. Each security is independent of the others and, as of December 31, 2020 and 2019, included corporate bonds and asset and mortgage backed obligations. As of December 31, 2020 and 2019, gross unrealized gains and losses on available-for-sale securities were not material.

Related to these investments the Company earned interest, which was recorded as interest income in the consolidated statement of earnings. Also the Company redeemed some of these securities and recognized gains (losses) due to changes in fair value, which were recorded as other income (expense) in the consolidated statement of earnings.

The following table summarizes the activity of these investments by category (in millions):

	Years ended
	December 31,
	2020		2019
Trading:
Interest earned	$	0.7	$	0.6
Unrealized gain (loss) at the end of the period	$	(*)	$	(*)
Available-for-sale:
Interest earned		(*)		(*)
Investment redeemed	$	0.1	$	—

(*)   Less than $0.1 million

At December 31, 2020 and 2019, contractual maturities of the available-for-sale debt securities are as follows (in millions):

	2020		2019
One year or less	$	—	$	—
Maturing after one year through five years		—		—
Maturing after five years through ten years		—		—
Due after 10 years		0.6		0.7
Total debt securities	$	0.6	$	0.7

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INVENTORIES:

12 Months Ended

Dec. 31, 2020

INVENTORIES:

INVENTORIES:

NOTE 4—INVENTORIES:

	At December 31,
(in millions)	2020		2019
Inventory, current:
Metals at average cost:
Finished goods	$	50.8	$	87.2
Work-in-process		248.9		259.7
Ore stockpiles on leach pads		298.5		358.4
Supplies at average cost		352.0		363.2
Total current inventory	$	950.2	$	1,068.5
Inventory, long-term:
Ore stockpiles on leach pads	$	1,125.0	$	1,230.3

Total leaching costs added as long-term inventory of ore stockpiles in leach pads amounted to $194.0 million, $469.0 million and $506.6 million in 2020, 2019 and 2018, respectively. Long-term leaching inventories recognized as cost of sales amounted to $359.1 million, $385.8 million and $299.4 million in 2020, 2019 and 2018, respectively.

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PROPERTY:

12 Months Ended

Dec. 31, 2020

PROPERTY:

PROPERTY:

NOTE 5—PROPERTY:

	At December 31,
(in millions)	2020		2019
Buildings and equipment	$	15,561.9	$	15,016.1
Construction in progress		1,481.6		1,294.8
Mine development		272.8		267.5
Mineral assets		83.2		83.2
Land, other than mineral		235.8		200.1
Total property		17,635.3		16,861.7
Accumulated depreciation, amortization and depletion		(8,176.6)		(7,490.7)
Total property and mine development, net	$	9,458.7	$	9,371.0

Depreciation and depletion expense for the years ended December 31, 2020, 2019 and 2018, amounted to $766.4 million, $759.9 million and $668.9 million, respectively.

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INTANGIBLE ASSETS:

12 Months Ended

Dec. 31, 2020

INTANGIBLE ASSETS:

INTANGIBLE ASSETS:

NOTE 6—INTANGIBLE ASSETS:

	At December 31,
(in millions)	2020		2019
Mining concessions	$	121.2	$	121.2
Mine engineering and development studies		19.8		19.8
Software		60.6		55.9
		201.6		196.9
Accumulated amortization:
Mining concessions		(38.6)		(38.0)
Mine engineering and development studies		(17.2)		(16.3)
Software		(44.7)		(36.1)
		(100.5)		(90.4)
Goodwill		41.9		41.9
Intangible assets, net	$	143.0	$	148.4

Amortization of intangibles for the years ended December 31, 2020, 2019 and 2018, amounted to $9.2 million, $4.5 million and $5.4 million, respectively. Estimated amortization is as follows:

Estimated amortization expense (in millions):
2021	$	7.7
2022		5.2
2023		5.2
2024		4.3
2025		3.0
Total 2021 - 2025	$	25.4
Average annual	$	5.1

Goodwill includes $17.0 million generated in 1997 as a result of purchasing a third party interest in the Buenavista mine. It also includes $24.9 million representing the amount of the purchase price in excess of the fair value of the net assets acquired from El Pilar mine. This goodwill is attributable to future benefits that the Company expects to realize from the mine and will not be deductible for income tax purposes.

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INCOME TAXES:

12 Months Ended

Dec. 31, 2020

INCOME TAXES:

INCOME TAXES:

NOTE 7—INCOME TAXES:

Since March 2009, Grupo Mexico, through its wholly-owned subsidiary AMC, owns an interest in excess of 80% of SCC. Accordingly, SCC’s results are included in the consolidated results of the Grupo Mexico subsidiary for U.S. federal income tax reporting. SCC provides current and deferred income taxes, as if it were filing a separate U.S. federal income tax return.

The introduction of the Global Intangible Low Tax Income or GILTI for tax years beginning in 2018 impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. For 2018-2020, there was no U.S. tax liability from the GILTI inclusion. The Company does not anticipate a tax on GILTI in the future because of increased fixed asset amounts and given the Mexican tax rate of 30%, no U.S. deferred taxes would be recorded. Accordingly, the Company has elected that if GILTI were to apply in the future, a current period expense would be recorded when incurred.

Also introduced with 2017 U.S tax reform and applicable to years 2018 and after is the Base Erosion Anti-Abuse Tax (BEAT). BEAT is a 5% minimum tax for tax year 2018, 10% for the years 2019 through 2025 and 12.5% in years thereafter. It is calculated on a base equal to the Company’s income determined without the tax benefit arising from base erosion payments. The Company did not incur a BEAT liability in 2018, 2019 and 2020 since it has met the safe harbor rule that provides a Company not to be subject to the BEAT if related party payments from the U.S. to foreign entities does not exceed 3% of expenses excluding cost of goods sold. The Company must continue to analyze applicability of the BEAT provisions on a yearly basis.

The components of the provision for income taxes for the three years ended December 31, 2020, are as follows:

(in millions)	2020		2019		2018
U.S. federal and state:
Current	$	—	$	—	$	2.6
Deferred		—		—		(13.0)
Uncertain tax positions		—		(1.3)		—
		—		(1.3)		(10.4)
Foreign (Peru and Mexico):
Current		1,237.9		966.3		1,102.4
Deferred		(63.5)		(30.1)		(38.5)
Uncertain tax positions		—		10.4		—
		1,174.4		946.6		1,063.9
Total provision for income taxes	$	1,174.4	$	945.3	$	1,053.5

The source of income is as follows:

(in millions)	2020		2019		2018
Earnings by location:
U.S.	$	(15.3)	$	(1.9)	$	(2.3)
Foreign
Peru		723.9		513.0		441.8
Mexico		2,037.2		1,915.4		2,149.9
		2,761.1		2,428.4		2,591.7
Earnings before taxes on income	$	2,745.8	$	2,426.5	$	2,589.4

The reconciliation of the statutory income tax rate to the effective tax rate for the three years ended December 31, 2020, is as follows (in percentage points):

	2020		2019		2018
Expected tax at U.S. statutory rate	21.0	%	21.0	%	21.0	%
Foreign tax at other than statutory rate, net of foreign tax credit benefit (1)	13.7		14.0		13.9
Percentage depletion	(2.2)		(2.7)		(2.1)
Other permanent differences	0.1		0.1		0.4
Change in 2017 valuation allowance on U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred taxes	—		—		7.5
Additional valuation allowance on 2018 U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred taxes	8.9		10.1		1.0
Decrease in 2017 U.S. deferred tax asset due to tax rate changes	—		—		(0.2)
U.S. one time transition tax on accumulated foreign earnings	—		—		0.4
Increase (decrease) in unrecognized tax benefits for uncertain tax positions	(0.1)		(2.1)		—
Amounts (over) / under provided in prior years	(0.1)		(1.1)		(1.3)
Other	1.5		(0.3)		0.1
Effective income tax rate	42.8	%	39.0	%	40.7	%

(1) Foreign tax at other than statutory rates, net of foreign tax credit benefit, also includes the effects of permanent differences in Peru and Mexico, that are determined at the local statutory rate.

The Company files income tax returns in three jurisdictions, Peru, Mexico and the United States. For the three years presented above, the statutory income tax rate for Mexico was 30% and the United States tax rate was 21%. The Peruvian tax rate was 29.5% for the three years presented above. While the largest components of income taxes are the

Peruvian and Mexican taxes, the Company is a domestic U.S. entity. Therefore, the rate used in the above reconciliation is the U.S. statutory rate.

For all of the years presented, both the Peruvian branch and Minera Mexico filed separate tax returns in their respective tax jurisdictions. Although the tax rules and regulations imposed in the separate tax jurisdictions may vary significantly, similar permanent items exist, such as items which are nondeductible or nontaxable. Some permanent differences relate specifically to SCC such as the allowance in the United States for percentage depletion.

Deferred taxes include the U.S., Peruvian and Mexican tax effects of the following types of temporary differences and carryforwards:

	At December 31,
(in millions)	2020		2019
Assets:
Inventories	$	62.4	$	55.7
Capitalized exploration expenses		13.0		14.0
U.S. foreign tax credit carryforward, net of FIN 48 liability		974.1		731.8
U.S. tax effect of Peruvian deferred tax liability		111.2		131.3
Provisions		169.5		145.0
Mexican tax on consolidated dividends		—		9.0
Deferred workers participation		37.8		24.7
Accrued salaries, wages and vacations		8.5		10.0
Sales price adjustment (PUI)		(5.8)		3.0
Social responsibility expenses		4.3		2.1
Deferred charges		41.8		14.5
Valuation allowance on U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred		(1,343.2)		(1,097.0)
Other		19.5		9.9
Total deferred tax assets		93.1		54.0
	At December 31,
(in millions)	2020		2019
Liabilities:
Property, plant and equipment		(17.2)		(45.4)
Other		(5.3)		(3.0)
Total deferred tax liabilities		(22.5)		(48.4)
Total net deferred tax (liabilities) / assets	$	70.6	$	5.6

The valuation allowance increased by $246.2 million over 2019’s level, which was primarily due to the valuation of unutilized Foreign Tax Credits generated in 2020 and the valuation of Foreign Tax Credits carried forward from prior years. The Peru branch operations are taxed in the U.S. as a flow through entity to SCC. Prior to 2017 U.S. Tax Reform, the U.S. corporate income tax rate was 35% on the Peru earnings, which enabled the company to use more currently generated foreign tax credits. Since tax reform reduced the U.S. tax rate to 21%, there is less U.S. income tax to absorb currently generated FTC’s or carryforwards. Additionally, allowable expenses in the U.S. for percentage depletion and U.S. sourced interest expense on debt reduced the branch income subject to U.S. tax, further limiting utilization of foreign tax credits.

U.S. Tax Matters—

As of December 31, 2020, the Company considers its ownership of the stock of Minera Mexico to be essentially permanent in duration.

As of December 31, 2020, $1,297.3 million of the Company´s total cash, cash equivalents and short-term investments of $2,594.4 million were held by foreign subsidiaries. The cash, cash equivalents and short-term investments maintained in our foreign operations are generally used to cover local operating and investment expenses. The Company has determined that as of December 31, 2020, a deferred tax asset of $0.2 billion exists with respect to its investment in foreign subsidiaries. Tax accounting guidance provided in ASC 740 requires this asset to be recognized only if the basis difference will reverse in the foreseeable future. Management has no plans that would result in the reversal of this temporary difference and consequently no deferred tax asset has been recorded. Future dividends from these subsidiaries are no longer subject to federal income tax in the U.S., and the Company incurs no state income tax liability. Additionally, there are no withholding taxes due to the tax treaty between the United States and Mexico. Earnings from the Company’s Peruvian branch are not subject to transition taxes given that they are taxed in the United States on a current basis.

At December 31, 2020, there were $1,040.0 million of foreign tax credits available for carryback or carryforward. These credits have a one-year carryback and a ten-year carryforward period and can only be used to reduce U.S. income tax on foreign earnings. There were no other unused U.S. tax credits at December 31, 2020. These credits will expire if not utilized by the end of the years listed below:

Year	Amount
2023		39.4
2024		102.0
2025		189.5
2026		107.0
2027		—
2028		159.6
2029		204.9
2030		237.6
Total	$	1,040.0

These foreign tax credits are presented above on a gross basis and have not been reduced here for any unrecognized tax benefits. These foreign tax credits have been adjusted to include the 2016 Net Operating Loss carryback in the U.S. jurisdiction, increasing foreign tax credits by approximately $15.9 million. In accordance with ASC 740 the Company has recorded $66.1 million for an unrecognized tax benefit as an offset to the Company’s deferred tax asset for foreign tax credits. The remaining foreign tax credits of $973.9 million are being re-valued to zero at December 31, 2020. It is the opinion of management that with the reduction in the U.S. corporate tax rate to 21% and considering the corporate tax rates in Mexico of 30% and in Peru at 29.5%, it is unlikely the excess foreign tax credits can be utilized. Additionally, foreign dividends will no longer be taxed in the U.S., thereby reducing the U.S. tax on the foreign source income that the credits can be used to offset.

Peruvian Tax Matters—

Royalty mining charge: The royalty charge is based on operating income margins with graduated rates ranging from 1% to 12% of operating profits, with a minimum royalty charge assessed at 1% of net sales. The minimum royalty charge is recorded as cost of sales and those amounts assessed at higher rates are included in the income tax provision. The Company has accrued $60.6 million, $42.3 million and $32.9 million of royalty charges in 2020, 2019 and 2018, respectively, of which $31.4 million, $14.2 million and $9.0 million were included in income taxes in 2020, 2019 and 2018, respectively.

Peruvian special mining tax: This tax is based on operating income with graduated rates increasing from 2% to 8.4%. The Company recognized $50.0 million, $38.1 million and $30.6 million in 2020, 2019 and 2018, respectively, with respect to this tax. These amounts are included as “income taxes” in the consolidated statement of earnings.

Mexican Tax Matters—

In 2013, the Mexican Congress enacted tax law changes that became effective on January 1, 2014. Among other effects, the amounts that Minera Mexico recorded during 2019 and paid in 2020 were:

● Mining royalty at the rate of 7.5% on taxable earnings before taxes: $60.1 million.

● Additional royalty of 0.5% over gross income from sales of gold, silver and platinum: $0.9 million.

On December 09, 2019, the Federal Revenue Law for fiscal year 2020, was published in the Federal Official Gazette, effective as of January 1, 2020. The main tax matters are reported as follows:

Income tax changes - Interest expense limitation based on profit levels: The Reform would subject taxpayers with interest expenses over 20 million Mexican pesos to a net interest expense deduction limitation equal to 30% of “adjusted taxable income.” Nondeductible interest expense for each year could be carried forward for 10 years. “Adjusted taxable income” is defined as taxable income for the year, with an addback for interest deductions on debt, as well as deductions for fixed assets, deferred charges and expenses, and pre-operating expenses. The interest limitation is calculated based on net interest, which is determined as interest income less interest expense. If interest income is greater, there is no limitation. Interest paid to Mexican residents, as well as non-residents, is subject to the limitation, as is interest to related and unrelated parties.

Accounting for Uncertainty in Income Taxes—

The total amount of unrecognized tax benefits in 2020, 2019 and 2018, was as follows (in millions):

	2020		2019		2018
Unrecognized tax benefits, opening balance	$	58.4	$	214.5	$	214.5
Gross increases—tax positions in prior period		—		(7.5)		—
Gross increases—current-period tax positions		7.7		(4.2)		—
Decreases related to settlements with taxing authorities		—		(144.4)		—
		7.7		(156.1)		—
Unrecognized tax benefits, ending balance	$	66.1	$	58.4	$	214.5

The amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate was zero at December 31, 2020 for unrecognized tax benefits in the Peruvian jurisdiction. Any recognition of unrecognized tax benefits within the U.S. jurisdiction would not affect the effective tax rate as long as the Company continues to value U.S. deferred tax assets including foreign tax credits. The Company has no unrecognized Mexican tax benefits.

The Company’s U.S. IRS audit of 2014 -2016 commenced in 2019 and is expected to settle in the first half of 2021.

As of December 31, 2020, the Company’s liability for uncertain tax positions did not include accrued interest and penalties in the U.S. jurisdiction. As of December 31, 2019 and December 31, 2018 the Company’s liability for uncertain tax positions included Peruvian accrued interest and penalties of $10.5 and $1.9 million, respectively.

The following tax years remain open to examination and adjustment in the Company’s three major tax jurisdictions:

Peru:	2014 and all subsequent years
U.S.:	2014 and all subsequent years
Mexico:	2015 and all subsequent years

Management does not expect that any of the open years will result in a cash payment within the U.S. jurisdiction in the upcoming twelve months ending December 31, 2021. Additionally, the Company expects that $0.6 million in cash payments in the Peruvian jurisdiction will be paid within the upcoming twelve months ending December 31, 2021. The Company’s reasonable expectations about future resolutions of uncertain items did not materially change during the year ended December 31, 2020.

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WORKERS' PARTICIPATION:

12 Months Ended

Dec. 31, 2020

WORKERS' PARTICIPATION:

WORKERS' PARTICIPATION:

NOTE 8—WORKERS’ PARTICIPATION:

The Company's operations in Peru and Mexico are subject to statutory workers' participation.

In Peru, the provision for workers' participation is calculated at 8% of pre-tax earnings. The current portion of this participation, which is accrued during the year, is based on the Peruvian Branch's taxable income and is distributed to workers following determination of final results for the year. The annual amount payable to an individual worker is capped at the worker’s salary for an 18 month period. Amounts determined in excess of the 18 months of worker’s salary is no longer made as a payment to the worker and is levied first for the benefit of the “Fondo Nacional de Capacitacion Laboral y de Promocion del Empleo” (National Workers’ Training and Employment Promotion Fund) until this entity receives from all employers in its region an amount equivalent to 2,200 Peruvian taxable units (approximately $2.6 million in 2020). Any remaining excess is levied as payment for the benefit of the regional governments. These levies fund worker training, employment promotion, entrepreneurship and various other programs.

In Mexico, workers' participation is determined using the guidelines established in the Mexican income tax law at a rate of 10% of pre-tax earnings as adjusted by the tax law.

The provision for workers’ participation is allocated to “Cost of sales (exclusive of depreciation, amortization and depletion)” and to “selling, general and administrative” in the consolidated statement of earnings, proportional to the number of workers in the production and administrative areas, respectively. Workers’ participation expense for the three years ended December 31, 2020 was as follows (in millions):

	2020		2019		2018
Current	$	248.5	$	188.8	$	219.9
Deferred		19.8		29.8		9.8
	$	268.3	$	218.6	$	229.7

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LEASES:

12 Months Ended

Dec. 31, 2020

LEASES:

LEASES:

NOTE 9—LEASES:

The Company has operating leases for power generating facilities, vehicles and properties. The Company recognizes lease expense for these leases on a straight-line basis over the lease term. Some of the Company’s leases include both lease and non-lease components which are accounted for separately. The Company’s leases have remaining lease terms of two years to 13 years, and do not include options to extend the leases. The Company’s lease agreements do not contain options to purchase the leased assets or to terminate the leases before the expiration date. In addition, the Company’s lease contracts do not have any material residual value guarantees or material restrictive covenants. As none of the Company’s leases provides an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments.

The weighted average remaining lease term for the Company’s leases is 9 years, and the weighted average discount rate for these leases is 3.71%.

The operating lease expense recognized in the years ended December 31, 2020 and 2019 was classified as follows (in millions):

Classification	2020		2019
Cost of sales (exclusive of depreciation, amortization and depletion)	$	114.4	$	114.4
Selling, general and administrative		0.2		0.2
Exploration		0.2		0.2
Total lease expense	$	114.8	$	114.8

The Company’s short-term lease costs for the year ended December 31, 2020 were $0.1 million.

Maturities of lease liabilities are as follows:

	Lease liabilities
Year	(in millions)
2021	$	114.7
2022		113.7
2023		112.3
2024		104.7
2025		103.7
After 2025		723.0
Total lease payments	$	1,272.1
Less: interest on lease liabilities		(293.1)
Present value of lease payments	$	979.0

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ASSET RETIREMENT OBLIGATION:

12 Months Ended

Dec. 31, 2020

ASSET RETIREMENT OBLIGATION:

ASSET RETIREMENT OBLIGATION:

NOTE 10—ASSET RETIREMENT OBLIGATION:

Peruvian operations:

The Company maintains an asset retirement obligation for its mining properties in Peru, as required by the Peruvian Mine Closure Law. In accordance with the requirements of this law the Company’s closure plans were approved by the Peruvian Ministry of Energy and Mines (“MINEM”). As part of the closure plans, the Company is required to provide annual guarantees over the estimated life of the mines, based on a present value approach, and to furnish the funds for the asset retirement obligation. This law requires a review of closing plans every five years.

On June 24, 2019, MINEM approved a change to the guarantees required for the mining closure plans. The new regulation specifies that the annual guarantees can be secured with real estate up to a maximum of 50% and the remaining amount with credit instruments. Currently, the Company has pledged the value of its Lima office complex for the 50% of the guarantee and with a stand-by letter of credit for the other 50% as security for this obligation. Through January 2021, the Company provided total guarantees of $56.5 million.

The closure cost recognized for this liability includes the cost, as outlined in its closure plans, of dismantling the Toquepala and Cuajone concentrators, the Ilo smelter and refinery, and the shops and auxiliary facilities at the three units. In March 2016, MINEM approved the Mining Closure Plan for the Toquepala expansion project and the revised closure plans for the Cuajone mine and the Ilo facilities were approved in January and October 2019, respectively. As result of these new estimates, the Company increased the asset retirement obligation by $28.1 million in 2019. The closure plan for the Tia Maria project was approved in February 2017. The Company, however, has not recorded a

retirement obligation for the project because the work on the project is on hold. The Company believes that under these circumstances the recording of a retirement obligation is not appropriate.

Mexican operations:

The Company has recognized an estimated asset retirement obligation for its mining properties in Mexico as part of its environmental commitment. Even though there is currently no enacted law, statute, ordinance, written or oral contract requiring the Company to carry out mine closure and environmental remediation activities, the Company believes that an obligation presently exists based on historical government requirements for the closure of any facility. The overall cost recognized for mining closure in Mexico includes the estimated costs of dismantling concentrators, smelter and refinery plants, shops and other facilities.

During 2020, the Company made a change in the estimate for the asset retirement obligation for its Mexican operations, mainly due to a detailed review of the closing activities required for each facility. The effect of this change was an increase in the asset retirement obligation of $269.3 million, which was recorded in December 2020.

The following table summarizes the asset retirement obligation activity for the years ended December 31, 2020 and 2019 (in millions):

	2020		2019
Balance as of January 1	$	262.3	$	217.7
Changes in estimates		269.3		36.4
Closure payments		(1.2)		(5.3)
Accretion expense		14.6		13.5
Balance as of December 31,	$	545.0	$	262.3

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FINANCING

12 Months Ended

Dec. 31, 2020

FINANCING:

FINANCING:

NOTE 11—FINANCING:

Long-term debt (in millions):

							Carrying
							value as of
	Face		Issuance		Issuance		December 31,
	amount		discount		costs		2020
3.500% Senior unsecured notes due 2022	$	300		(0.2)	$	(0.3)	$	299.5
3.875% Senior unsecured notes due 2025		500		(1.3)		(1.2)		497.5
9.250% Yankee bonds due 2028		51.2		—		—		51.2
7.500% Senior unsecured notes due 2035		1,000		(12.0)		(8.0)		980.0
6.750% Senior unsecured notes due 2040		1,100		(6.9)		(5.6)		1,087.5
5.250% Senior unsecured notes due 2042		1,200		(18.6)		(6.2)		1,175.2
5.875% Senior unsecured notes due 2045		1,500		(16.1)		(8.5)		1,475.4
4.500% Minera Mexico Senior unsecured notes due 2050		1,000		(12.5)		(9.6)		977.9
Total	$	6,651.2	$	(67.6)	$	(39.4)		6,544.2
Less, current portion								—
Total long-term debt							$	6,544.2

							Carrying
							value as of
	Face		Issuance		Issuance		December 31,
	amount		discount		costs		2019
5.375% Senior unsecured notes due 2020	$	400		(0.1)	$	(0.1)	$	399.8
3.500% Senior unsecured notes due 2022		300		(0.3)		(0.5)		299.2
3.875% Senior unsecured notes due 2025		500		(1.6)		(1.5)		496.9
9.250% Yankee bonds due 2028		51		—		—		51.2
7.500% Senior unsecured notes due 2035		1,000		(12.4)		(8.3)		979.3
6.750% Senior unsecured notes due 2040		1,100		(7.1)		(5.7)		1,087.2
5.250% Senior unsecured notes due 2042		1,200		(19.0)		(6.3)		1,174.7
5.875% Senior unsecured notes due 2045		1,500		(16.4)		(8.6)		1,475.0
4.500% Minera Mexico Senior unsecured notes due 2050		1,000		(12.7)		(9.8)		977.5
Total	$	7,051	$	(69.6)	$	(40.8)		6,940.8
Less, current portion								(399.8)
Total long-term debt							$	6,541.0

The bonds, referred above as “Yankee bonds”, contain a covenant requiring Minera Mexico to maintain a ratio of EBITDA to interest expense of not less than 2.5 to 1.0 as such terms are defined in the debt instrument. At December 31, 2020, Minera Mexico was in compliance with this covenant.

Between July 2005 and November 2012 the Company issued senior unsecured notes six times totaling $4.2 billion, as listed above. Interest on the notes is paid semi-annually in arrears. The notes rank pari passu with each other and rank pari passu in right of payment with all of the Company’s other existing and future unsecured and unsubordinated indebtedness. On April 20, 2015, the Company issued $2.0 billion of fixed-rate senior unsecured notes. This debt was issued in two tranches, $500 million due 2025 at an annual interest rate of 3.875% and $1.5 billion due 2045 at an annual interest rate of 5.875%. These notes are general unsecured obligations of the Company and rank equally with all of its existing and future unsecured and unsubordinated debt. Net proceeds are being used for general corporate purposes, including the financing of the Company´s capital investment program. The notes were issued with an underwriters’ discount of $20.2 million. Additionally, issuance costs of $11.8 million associated with these notes were paid and deferred. The unamortized balance of the discount and the costs are presented net of the carrying value of the debt issued and are amortized as interest expense over the life of the loan.

The indentures relating to the notes contain certain restrictive covenants, including limitations on liens, limitations on sale and leaseback transactions, rights of the holders of the notes upon the occurrence of a change of control triggering event, limitations on subsidiary indebtedness and limitations on consolidations, mergers, sales or conveyances. Certain of these covenants cease to be applicable before the notes mature if the Company obtains an investment grade rating. The Company obtained investment grade rating in 2005. The Company has registered these notes under the Securities Act of 1933, as amended. The Company may issue additional debt from time to time pursuant to certain of the indentures.

If the Company experiences a “Change of Control Triggering Event”, the Company must offer to repurchase the notes at a purchase price equal to 101% of the principal amount thereof, plus accrued and unpaid interest, if any. A Change of Control Trigger Event means a Change of Control (as defined) and a rating decline (as defined), that is, if the rating of the notes, by at least one of the rating agencies shall be decreased by one or more gradations.

At December 31, 2020, the Company was in compliance with the covenants of the notes.

On September 26, 2019, SCC’s subsidiary Minera Mexico S.A. de C.V. issued $1.0 billion of fixed-rate senior notes with a discount of $12.7 million. Additionally, issuance costs of $9.8 million associated with these notes were paid and

deferred. The unamortized balance of the discount and the costs are presented net of the carrying value of the debt issued and are amortized as interest expense over the life of the loan. This debt was issued in one tranche, due in 2050 at an annual interest rate of 4.5%. Interest on the notes is paid semi-annually in arrears. The Company intends to use the net proceeds from this offering (i) to finance Minera Mexico expansion program, including the Buenavista Zinc, Pilares and El Pilar projects, (ii) for other capital expenditures and (iii) for general corporate purposes.

The notes constitute general unsecured obligations of Minera Mexico. The notes were issued in an unregistered offering pursuant to Rule 144A and Regulation S under the Securities Act of 1933. The Company capitalized the costs associated with the issuance of this facility, which are included as part of the amortized cost of the long-term debt in the consolidated balance sheet.

In connection with the transaction, on September 26, 2019, Minera Mexico entered into an indenture with Wells Fargo Bank, National Association, as trustee, which provided for the issuance, and set forth the terms of the notes described above. The indenture contains covenants that limit Minera Mexico's ability to, among other things, incur certain liens securing indebtedness, engage in certain sale and leaseback transactions, and enter into certain consolidations, mergers, conveyances, transfers or leases of all or substantially all of Minera Mexico's assets.

Aggregate maturities of the outstanding borrowings at December 31, 2020, are as follows:

	Principal
Years	Due(*)
	(in millions)
2021	$	—
2022		300.0
2023		—
2024		—
2025		500.0
Thereafter		5,851.2
Total	$	6,651.2

(*)Total debt maturities do not include the debt discount valuation account of $107.0 million.

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BENEFIT PLANS

12 Months Ended

Dec. 31, 2020

BENEFIT PLANS:

BENEFIT PLANS:

NOTE 12—BENEFIT PLANS:

Post retirement defined benefit plans and defined contribution plan

The Company has two noncontributory defined benefit pension plans covering former salaried employees in the United States and certain former expatriate employees in Peru (the “Expatriate Plan”). Effective October 31, 2000, the Board of Directors amended the qualified pension plan to suspend the accrual of benefits. In addition, the Company’s Mexican subsidiaries have a defined contribution pension plan for salaried employees and a non-contributory defined benefit pension plan for union employees (the “Mexican Plan”).

The components of net periodic benefit costs calculated in accordance with ASC 715 “Compensation retirement benefits,” using December 31 as a measurement date, consist of the following:

(in millions)	2020		2019		2018
Service cost	$	1.4	$	1.1	$	1.0
Interest cost		1.7		1.8		1.6
Expected return on plan assets		(2.9)		(3.5)		(3.4)
Amortization of net actuarial loss		0.1		—		—
Amortization of prior service cost / (credit)		0.2		0.2		0.2
Settlement / Curtailment		(0.4)		—		(0.2)
Amortization of net loss/(gain)		0.2		0.3		0.2
Net periodic benefit cost	$	0.3	$	(0.1)	$	(0.6)

The change in benefit obligation and plan assets and a reconciliation of funded status are as follows:

	As of December 31,
(in millions)	2020		2019
Change in benefit obligation:
Projected benefit obligation at beginning of year	$	33.7	$	27.4
Service cost		1.4		1.1
Interest cost		1.7		1.8
Settlement		—		—
Benefits paid		(1.9)		(1.8)
Actuarial (gain)/loss		(4.2)		3.6
Actuarial gain assumption changes		0.8		0.9
Inflation adjustment		(1.6)		0.7
Projected benefit obligation at end of year	$	29.9	$	33.7
Change in plan assets:
Fair value of plan assets at beginning of year	$	51.6	$	46.7
Actual return on plan assets		6.5		4.8
Employer contributions		(0.6)		(0.6)
Benefits paid		(0.9)		(0.9)
Currency exchange rate adjustment		(2.2)		1.6
Fair value of plan assets at end of year	$	54.4	$	51.6
Funded status at end of year:	$	24.5	$	17.9
ASC-715 amounts recognized in statement of financial position consists of:
Non-current assets	$	24.5	$	17.9
Total	$	24.5	$	17.9
ASC-715 amounts recognized in accumulated other comprehensive income (net of income taxes of $(2.3) million and $(5.4) million in 2020 and 2019, respectively) consists of:
Net loss (gain)	$	3.0	$	7.6
Prior service cost		1.2		1.4
Total	$	4.2	$	9.0

The following table summarizes the changes in accumulated other comprehensive income for the years ended December 31, related to the defined benefit pension plan, net of income tax:

(in millions)	2020		2019
Reconciliation of accumulated other comprehensive income:
Accumulated other comprehensive income at beginning of plan year	$	9.0	$	7.2
Net loss/(gain) amortized during the year		(4.1)		1.9
Net loss/(gain) occurring during the year		(0.3)		(0.2)
Prior service cost (credit)		—		—
Currency exchange rate adjustment		(0.4)		0.1
Net adjustment to accumulated other comprehensive income (net of income taxes of $3.1 million and $(2.2) million in 2020 and 2019, respectively)		(4.8)		1.8
Accumulated other comprehensive income at end of plan year	$	4.2	$	9.0

The following table summarizes the amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost in 2020 and 2019, net of income tax:

(in millions)	2020		2019
Net loss / (gain)	$	(4.1)	$	1.8
Amortization of net (loss) gain		(0.3)		(0.2)
Amortization of prior services cost (credit)		—		—
Total amortization expenses	$	(4.4)	$	1.6

The assumptions used to determine the pension obligations are:

Expatriate Plan	2020		2019		2018
Discount rate	1.90	%	2.85	%	3.90	%
Expected long-term rate of return on plan asset	3.50	%	4.00	%	4.00	%
Rate of increase in future compensation level	N/A		N/A		N/A

Mexican Plan(*)	2020		2019		2018
Discount rate	7.43	%	7.15	%	8.45	%
Expected long-term rate of return on plan asset	7.43	%	7.15	%	8.45	%
Rate of increase in future compensation level	4.50	%	4.50	%	4.50	%

(*)These rates are based on Mexican pesos as pension obligations are denominated in this currency.

The scheduled maturities of the benefits expected to be paid in each of the next five years, and thereafter, are as follows:

	Expected
Years	Benefit Payments
	(in millions)
2021	$	3.1
2022		1.7
2023		1.8
2024		2.0
2025		1.8
2026 to 2028		12.5
Total	$	22.9

Expatriate Plan

The Company’s funding policy is to contribute amounts to the qualified plan sufficient to meet the minimum funding requirements set forth in the Employee Retirement Income Security Act of 1974 plus such additional amounts as the Company may determine to be appropriate.

Plan assets are invested in a group annuity contract with Metropolitan Life Insurance Company (“MetLife”). The Contract invests in the MetLife General Account Payment Fund (the "General Account") and the MetLife Broad Market Core Bond Fund (the “Bond Fund”) managed by BlackRock, Inc.

The General Account is broadly diversified across asset classes and backed by the total capital of MetLife.

The Bond Fund seeks to outperform the Bloomberg Barclays ® U.S. Aggregate Bond Index, net of fees, over a full market cycle. The Bond Fund invests in publicly traded, investment grade securities. These may include corporate securities, mortgage securities, treasuries and cash, agency securities, commercial mortgage backed securities and other investment vehicles adhering to the fund’s investment objectives. These investments are classified as Level 1 because they are valued using quoted prices of the same securities as they consist of instruments which are publicly traded.

Plan assets are invested with the objective of maximizing returns with an acceptable level of risk and maintaining adequate liquidity to fund expected benefit payments. The Company's policy for determining asset mix-targets to meet investment objectives includes periodic consultation with recognized third-party investment consultants.

The expected long-term rate of return on plan assets is reviewed annually, taking into consideration asset allocations, historical returns and the current economic environment. Based on these factors the Company expects its assets will earn an average of 4.00% per annum assuming its long-term mix will be consistent with its current mix.

Mexican Plan

Minera Mexico’s policy for determining asset mix targets includes periodic consultation with recognized third-party investment consultants. The expected long-term rate of return on plan assets is updated periodically, taking into consideration assets allocations, historical returns and the current economic environment. The fair value of plan assets is impacted by general market conditions. If actual returns on plan assets vary from the expected returns, actual results could differ.

The plan assets are managed by three financial institutions, Scotiabank Inverlat S.A., Banco Santander and GBM Grupo Bursatil Mexicano, S.A. 78% of the funds are invested in Mexican government securities, including treasury certificates and development bonds of the Mexican government. The remaining 22% is invested in common shares of Grupo Mexico. The plan assets are invested without restriction in active markets that are accessible when required and are therefore considered as level 1, in accordance with ASC 820 “Fair Value Measurement.”

These plans accounted for approximately 100% of benefit obligations. The following table represents the asset mix of the investment portfolio as of December 31:

	2020		2019
Asset category:
Treasury bills	78	%	80	%
Equity securities	22	%	20	%
	100	%	100	%

The amount of contributions that the Company expects to pay to the plan during 2021 is $2.3 million.

Post-retirement Health Care Plan:

United States: The Company adopted a post-retirement health care plan for retired salaried employees eligible for Medicare in 1996. The Company manages the plan and is currently providing health benefits to retirees. The plan is accounted for in accordance with ASC 715 “Compensation retirement benefits.”

In Mexico, health services are provided by the Mexican Social Security Institute.

The components of net period benefit costs for the three years ended December 31, 2020 are as follows:

(in millions)	2020		2019		2018
Interest cost	$	1.3	$	0.9	$	0.9
Amortization of prior service cost/ (credit)		—		(0.2)		(0.2)
Net periodic benefit cost	$	1.3	$	0.7	$	0.7

The change in benefit obligation and a reconciliation of funded status are as follows:

	As of December 31,
(in millions)	2020		2019
Change in benefit obligation:
Projected benefit obligation at beginning of year	$	20.6	$	11.9
Interest cost		1.3		0.9
Actuarial loss/ (gain)-claims cost		—		—
Benefits paid		(1.5)		(1.3)
Actuarial (gain)/loss		4.5		8.6
Inflation adjustment		(1.1)		0.5
Projected benefit obligation at end of year	$	23.8	$	20.6
Change in plan assets:
Fair value of plan assets at beginning of year	$	—	$	—
Employer contributions		0.1		0.1
Benefits paid		(0.1)		(0.1)
Fair value of plan assets at end of year	$	—	$	—
Funded status at end of year:	$	23.8	$	20.6
ASC-715 amounts recognized in statement of financial position consists of:
Current liabilities	$	—	$	(0.1)
Non-current liabilities		(23.8)		(20.5)
Total	$	(23.8)	$	(20.6)
ASC-715 amounts recognized in accumulated other comprehensive income consists of:
Net loss (gain)	$	4.6	$	1.5
Total (net of income taxes of $(1.9) million and $(0.7) million in 2020 and 2019, respectively)	$	4.6	$	1.5

The following table summarizes the changes in accumulated other comprehensive income for the years ended December 31, related to the post-retirement health care plan, net of income tax:

	As of December 31,
(in millions)	2020		2019
Reconciliation of accumulated other comprehensive income:
Accumulated other comprehensive income at beginning of plan year	$	1.5	$	(4.4)
Net loss/(gain) occurring during the year		3.2		6.0
Net loss/(gain) amortized during the year		—		0.1
Currency exchange rate adjustment		(0.1)		(0.2)
Net adjustment to accumulated other comprehensive income (net of income taxes of $(1.2) million and $(2.6) million in 2020 and 2019, respectively)		3.1		5.9
Accumulated other comprehensive income at end of plan year	$	4.6	$	1.5

The following table summarizes the amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost in 2020 and 2019, net of income tax:

	As of December 31,
(in millions)	2020		2019
Net loss / (gain)	$	3.2	$	5.9
Amortization of net (loss) gain		—		0.2
Total amortization expenses	$	3.2	$	6.1

The discount rates used in the calculation of other post-retirement benefits and cost as of December 31 were:

	2020		2019		2018
Expatriate health plan
Discount rate	1.90	%	2.85	%	3.90	%
Mexican health plan
Weighted average discount rate	7.43	%	7.15	%	8.45	%

The benefits expected to be paid in each of the next five years, and thereafter, are as follows:

	Expected
Year	Benefit Payments
	(in millions)
2021	$	1.5
2022		1.6
2023		1.5
2024		1.5
2025		1.6
2026 to 2030		8.6
Total	$	16.3

Expatriate Health Plan

For measurement purposes for pre 65 year old participants, a 5.1% annual rate of increase in the per capita cost of covered health care benefits was assumed for 2020 which gradually decrease to 4.2%. For post 65 year old the annual rate of increase in the per capita cost for 2020 is 4.9% which is assumed to decrease gradually to 4.0%.

Assumed health care cost trend rates can have a significant effect on amounts reported for health care plans. However, because of the size of the Company’s plan, a one percentage-point change in assumed health care trend rate would not have a significant effect.

Mexican Health Plan

For measurement purposes, a 4.5% annual rate of increase in the per capita cost of covered health care benefits was assumed for 2020 and remains at that level thereafter.

An increase in other benefit cost trend rates have a significant effect on the amount of the reported obligations, as well as component cost of the other benefit plan. One percentage-point change in assumed other benefits cost trend rates would have the following effects:

	One Percentage
	Point
(in millions)	Increase		Decrease
Effect on total service and interest cost components	$	1.9	$	1.5
Effect on the post-retirement benefit obligation	$	24.7	$	22.2

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COMMITMENTS AND CONTINGENCIES:

12 Months Ended

Dec. 31, 2020

COMMITMENTS AND CONTINGENCIES:

COMMITMENTS AND CONTINGENCIES:

NOTE 13—COMMITMENTS AND CONTINGENCIES:

Environmental matters:

The Company has instituted extensive environmental conservation programs at its mining facilities in Peru and Mexico. The Company’s environmental programs include, among others, water recovery systems to conserve water and minimize the impact on nearby streams, reforestation programs to stabilize the surface of the tailings dams and the implementation of scrubbing technology in the mines to reduce dust emissions.

Environmental capital investments in years 2020, 2019 and 2018, were as follows (in millions):

	2020		2019		2018
Peruvian operations (*)	$	(3.3)	$	18.6	$	59.3
Mexican operations		41.1		64.3		43.5
	$	37.8	$	82.9	$	102.8

(*)The activity in 2020 includes prepayment settlements classified to expenses.

Peruvian operations: The Company’s operations are subject to applicable Peruvian environmental laws and regulations. The Peruvian government, through the Ministry of Environment (“MINAM”) conducts annual audits of the Company’s Peruvian mining and metallurgical operations. Through these environmental audits, matters related to environmental obligation, compliance with legal requirements, atmospheric emissions, effluent monitoring and waste management are reviewed. The Company believes that it is in material compliance with applicable Peruvian environmental laws and regulations. Peruvian law requires that companies in the mining industry provide assurances for future mine closure and remediation. In accordance with the requirements of this law, the Company’s closure plans were approved by MINEM. See Note 10 “Asset retirement obligation,” for further discussion of this matter.

Air Quality Standards (“AQS”): In June 2017, MINAM enacted a supreme decree which defines new AQS for daily sulfur dioxide in the air. As of December 31, 2020, the Company maintains a lower daily average level of µg/m3 of SO2, than those required by the new AQS.

Soil Environmental Quality Standards (“SQS”): In 2013, the Peruvian government enacted Soil Quality Standards. In accordance with the regulatory requirements of the law, the Company prepared Soil Descontamination Plans (“SDP”)

for environmentally impacted sites in each of its operation units (Toquepala, Cuajone and Ilo) with the assistance of consulting companies. The cost of these SDPs are not material, either individually or in aggregated form, for the financial statements of the Company.

Mexican operations: The Company’s operations are subject to applicable Mexican federal, state and municipal environmental laws, to Mexican official standards, and to regulations for the protection of the environment, including regulations relating to water supply, water quality, air quality, noise levels and hazardous and solid waste.

The principal legislation applicable to the Company’s Mexican operations is the Federal General Law of Ecological Balance and Environmental Protection (the “General Law”), which is enforced by the Federal Bureau of Environmental Protection (“PROFEPA”). PROFEPA monitors compliance with environmental legislation and enforces Mexican environmental laws, regulations and official standards. It may also initiate administrative proceedings against companies that violate environmental laws, which in the most extreme cases may result in the temporary or permanent shutdown of non-complying facilities, the revocation of operating licenses and/or other sanctions or fines.

In 2011, the General Law was amended to provide an individual or entity the ability to contest administrative acts, including environmental authorizations, permits or concessions granted, without the need to demonstrate the actual existence of harm to the environment as long as it can be argued that the harm may be caused. In addition, in 2011, amendments to the Civil Federal Procedures Code (“CFPC”) were enacted, which established three categories of collective actions under which a group of 30 or more individuals can be considered sufficient to prove a “legitimate interest” to file civil actions for injuries derived from alleged violations of environmental, consumer protection, financial services and economic competition laws and to seek restitution or economic compensation for the alleged injuries or the suspension of the activities which allegedly generated the injuries in question. The amendments to the CFPC may result in more litigation, with plaintiffs seeking remedies, including suspension of the activities alleged to cause harm.

In 2013, the Environmental Liability Federal Law was enacted. The law establishes general guidelines for actions to be considered to likely cause environmental harm. If a possible determination regarding harm occurs, environmental clean-up and remedial actions sufficient to restore environment to a pre-existing condition should be taken. Under this law, if restoration is not possible, compensation measures should be provided. Criminal penalties and monetary fines can be imposed under this law.

On February 2019, the Mexican Supreme Court confirmed the constitutionality of an ecological tax on extractive activities developed in the state of Zacatecas, which taxes the environmental remediation actions; emissions of certain gases to the atmosphere; emissions of pollutant substances to the soil or water; and waste storage within the state territory. The Company has determined that this new environmental regulation will have no impact on its financial position.

Guaymas sulfuric acid spill:

On July 9, 2019, there was an incident at the Company´s Marine Terminal in Guaymas, Sonora, that caused the discharge of approximately three cubic meters of sulfuric acid into the sea in the industrial port area.

The Guaymas bay has an estimated water volume of 340 million cubic meters. The spill, upon entering in contact with the sea’s alkaline conditions, led to quick dilution of the discharge and the sulfuric acid was naturally and immediately neutralized. As a result, the discharge was considered harmless; the report from the Ministry of Navy found that neither the flora nor fauna of the port area were affected.

On July 10, 2019, PROFEPA made a first inspection of the area, concluding that the Company executed all the appropriate procedures in order to contain the discharge, and no reference was made to the existence of negative impacts on the environment resulting from the incident.

On Friday, July 19, 2019, PROFEPA revisited the facilities to carry out a second inspection, declaring a partial temporary shutdown that affected only the storage process and transportation of sulfuric acid at the terminal, arguing the absence of an authorization of environmental impact. It is important to note that these facilities have been in operation since 1979, prior to the 1988 Mexican General Law of Ecological Balance and the Protection of the Environment. Companies that were operating before the aforementioned law are exempt from the permit requirement. In addition, in 2009, PROFEPA awarded a certification of “Clean Industry and Environmental Quality” to the facility which was subsequently renewed four times (for a two-year period each time).

The Company is not aware of the reasons or causes for this partial and temporary closure, but will continue working with the environmental authorities to provide certainty that the operation is in strict compliance with environmental regulations. The Company expects the environmental authorities to suspend the partial temporary shutdown, once they resolve their concerns. Currently, the Company does not expect any impact on its operations. As of December 31, 2020, the matter is pending resolution.

Litigation matters:

Peruvian operations

The Tia Maria Mining Project

There are five lawsuits filed against the Peruvian Branch of the Company related to the Tia Maria project. The lawsuits seek (i) to declare null and void the resolution that approved the Environmental Impact Assessment of the project; (ii) the cancellation of the project and the withdrawal of mining activities in the area; (iii) to declare null and void the mining concession application for the Tia Maria project; and (iv) to declare null and void the resolution that approved the construction license. The lawsuits were filed by Messrs. Jorge Isaac del Carpio Lazo (filed May 22, 2015), Ernesto Mendoza Padilla (filed May 26, 2015), Juan Alberto Guillen Lopez (filed June 18, 2015), Junta de Usuarios del Valle del Tambo (filed April 30, 2015), and Gobierno Regional de Arequipa (filed December 16, 2019).

The del Carpio Lazio case was rejected by the court of first instance on November 14, 2016. The plaintiff filed an appeal before the Superior Court on January 3, 2017. On January 9, 2018, the lawyers of both parties presented their respective positions before the Appellate Court. On March 8, 2018, the Appellate Court issued its final decision, which upheld the first instance ruling. On April 27, 2018, the plaintiff filed an extraordinary appeal before the Supreme Court. As of December 31, 2020, the case remains pending resolution.

The Mendoza Padilla case was initially rejected by the lower court on July 8, 2015. This ruling was confirmed by the Superior Court on June 14, 2016. On July 12, 2016, the case was appealed before the Constitutional Court. On November 20, 2018, the Constitutional Court reversed the previous decisions and remanded the case to the lower court for further action. In the third quarter of 2020, the Company was notified that the complaint had been reinstated. The Company answered the complaint on September 15, 2020. On December 2, 2020, the lower court issued a resolution, considering the complaint answered. As of December 31, 2020, the case remains pending resolution.

The Guillen Lopez case is currently before the lower court. On July 19, 2019, the oral arguments took place. On January 7, 2020, the Judge decided to suspend the proceeding until the del Carpio Lazio case is concluded. Therefore, as of December 31, 2020, the case remains pending resolution.

The Junta de Usuarios del Valle del Tambo case is currently before the lower court. On May 2016, the Company was included in the process, after the Ministry of Energy and Mines filed a civil complaint. On March 6, 2019, the Company was formally notified of the lawsuit and answered the complaint on March 20, 2019. On July 8, 2019, the Company

requested the suspension of the proceeding until the del Carpio Lazio case is concluded. As of December 31, 2020, the case remains pending resolution.

The Gobierno Regional de Arequipa case is currently before the lower court and the Company answered the complaint on September 15, 2020. As of December 31, 2020, the case remains pending resolution.

The Company asserts that these lawsuits are without merit and is vigorously defending against them. The potential contingency amount for these cases cannot be reasonably estimated by management at this time.

Special Regional Pasto Grande Project (“Pasto Grande Project”)

In 2012, the Pasto Grande Project, an entity of the Regional Government of Moquegua, filed a lawsuit against SCC’s Peruvian Branch alleging property rights over a certain area used by the Peruvian Branch and seeking the demolition of the tailings dam where SCC’s Peruvian Branch has deposited its tailings from the Toquepala and Cuajone operations since 1995. The Peruvian Branch has had title to use the area in question since 1960 and has, since 1995, constructed and operated the tailings dams with proper governmental authorization. Upon a motion filed by the Peruvian Branch, the lower court has included MINEM as a defendant in this lawsuit. MINEM has answered the complaint and denied the validity of the claim. As of December 31, 2020, the case was pending resolution without further developments. SCC’s Peruvian Branch asserts that the lawsuit is without merit and is vigorously defending against it. The amount of this contingency cannot be reasonably estimated by management at this time.

Mexican operations

The Accidental Spill at Buenavista Mine of 2014

In relation to the 2014 accidental spill of copper sulfate solution that occurred at a leaching pond in the Buenavista mine, the following legal procedures are pending against the Company:

On August 19, 2014, PROFEPA, as part of the administrative proceeding initiated after the spill, announced the filing of a criminal complaint against Buenavista del Cobre S.A. de C.V. (“BVC”), a subsidiary of the Company, in order to determine those responsible for environmental damages. During the second quarter of 2018, the criminal complaint was dismissed. This decision was appealed and was pending resolution as of December 31, 2020.

Through the first half of 2015, six collective action lawsuits were filed in federal courts in Mexico City and Sonora against two subsidiaries of the Company seeking economic compensation, clean up and remedial activities in order to restore the environment to its pre-existing conditions. Two of the collective action lawsuits have been dismissed by the court. As of December 31, 2020, four lawsuits continue in process: three were filed by Acciones Colectivas de Sinaloa, A.C. and one, by Defensa Colectiva, A.C.; requesting precautionary measures about construction of facilities for monitoring public health services and prohibiting the closure of the Rio Sonora Trust.

Similarly, during 2015, eight civil action lawsuits were filed against BVC in the state courts of Sonora seeking damages for alleged injuries and for moral damages as a consequence of the spill. The plaintiffs in the state court lawsuits are: Jose Vicente Arriola Nunez et al; Santana Ruiz Molina et al; Andres Nogales Romero et al; Teodoro Javier Robles et al; Gildardo Vasquez Carvajal et al; Rafael Noriega Souffle et al; Grupo Banamichi Unido de Sonora El Dorado, S.C. de R.L. de C.V; and Marcelino Mercado Cruz. In 2016, three additional civil action lawsuits, claiming similar damages, were filed by Juan Melquicedec Lebaron; Blanca Lidia Valenzuela Rivera et al and Ramona Franco Quijada et al. In 2017, BVC was served with thirty-three additional civil action lawsuits, claiming similar damages. The lawsuits were filed by Francisco Javier Molina Peralta et al; Anacleto Cohen Machini et al; Francisco Rafael Alvarez Ruiz et al; Jose Alberto Martinez Bracamonte et al; Gloria del Carmen Ramirez Duarte et al; Flor Margarita Sabori et al; Blanca Esthela Ruiz Toledo et al; Julio Alfonso Corral Dominguez et al; Maria Eduwiges Bracamonte Villa et al; Francisca Marquez

Dominguez et al; Jose Juan Romo Bravo et al; Jose Alfredo Garcia Leyva et al; Gloria Irma Dominguez Perez et al; Maria del Refugio Romero et al; Miguel Rivas Medina et al; Yolanda Valenzuela Garrobo et al; Maria Elena Garcia Leyva et al; Manuel Alfonso Ortiz Valenzuela et al; Francisco Alberto Arvayo Romero et al; Maria del Carmen Villanueva Lopez et al; Manuel Martin Garcia Salazar; Miguel Garcia Arguelles et al; Dora Elena Rodriguez Ochoa et al; Honora Eduwiges Ortiz Rodriguez et al; Francisco Jose Martinez Lopez et al; Maria Eduwiges Lopez Bustamante; Rodolfo Barron Villa et al, Jose Carlos Martinez Fernandez et al, Maria de los Angeles Fabela et al; Rafaela Edith Haro et al; Luz Mercedes Cruz et al; Juan Pedro Montaño et al; and Juana Irma Alday Villa. In the first quarter of 2018, BVC was served with another civil action lawsuit, claiming similar damages. The lawsuit was filed by Alma Angelina Del Cid Rivera et al. In the last quarter of 2018, BVC was served with other three civil action lawsuits, claiming similar damages. These lawsuits were filed by Los Corrales de la Estancia, S.C. de R.L.; Jose Antonio Navarro; Jesus Maria Peña Molina, et al; these actions were dismissed by the court, because they have expired. As of December 31, 2020, forty-five cases remain pending resolution.

In 2015, four constitutional lawsuits (juicios de amparo) were filed before Federal Courts against various authorities and against a subsidiary of the Company, arguing; (i) the alleged lack of a waste management program approved by SEMARNAT; (ii) the alleged lack of a remediation plan approved by SEMARNAT with regard to the August 2014 spill; (iii) the alleged lack of community approval regarding the environmental impact authorizations granted by SEMARNAT to one subsidiary of the Company; and (iv) the alleged inactivity of the authorities with regard of the spill in August 2014. The plaintiffs of these lawsuits are: Francisca Garcia Enriquez, et al filed two lawsuits, Francisco Ramon Miranda, et al and Jesus David Lopez Peralta et al. In the third quarter of 2016, four additional constitutional lawsuits, claiming similar damages were filed by Mario Alberto Salcido et al; Maria Elena Heredia Bustamante et al; Martin Eligio Ortiz Gamez et al; and Maria de los Angeles Enriquez Bacame et al. In the third quarter of 2017, BVC was served with another constitutional lawsuit filed by Francisca García Enriquez et al. In 2018, BVC was served with two additional constitutional lawsuits that were filed against SEMARNAT by Norberto Bustamante et al. Regarding the constitutional lawsuit filed by Maria Elena Heredia Bustamante et al; in which it was claimed the lack of community approval regarding the authorization granted by SEMARNAT to build the new BVC tailings dam, on September 5, 2018, the Supreme Court of Justice issued a resolution establishing that such authorization was granted to BVC in compliance with the applicable legislation. However, SEMARNAT must carry out a public meeting to inform the community of the technical aspects required to build the dam, potential impacts and prevention measures, with no material effects to BVC’s operations. SEMARNAT has carried out the consultation ordered by the Supreme Court. As a result, has informed the corresponding Judge about its compliance with the resolution, in which BVC was imposed additional measures of environmental impact prevention, such as: (i) the building of at least three monitoring wells downstream from the curtain of the contingency dam in a period of six months; (ii) monitoring of the groundwater level and water quality every six months; (iii) carrying out rain collection work in order to restore water to the Sonora River basin, for which six months are granted to present the execution program; (iv) determine the location of wildlife conservation and protection areas and define the need to establish biological corridors; (v) obtain photographic or videographic evidence every six months; (vi) submitting to SEMARNAT two years before the closure and abandonment of the site, or earlier if necessary, the closure program that includes the cleaning and restoration of the soil including Mexican regulation NOM-141; (vii) include the measures in the Environmental Monitoring Program according to the environmental components impacted; and (viii) hiring an external environmental consultant to validate compliance with the current and new conditions that are imposed. The foregoing does not impact BVC’s operations. Likewise, it is noted that the lawsuits filed by Maria de los Angeles Enriquez Bacame and Norberto Bustamante have been dismissed and closed without prejudice to the Company. As of December 31, 2020, the remaining cases were still pending resolution.

It is currently not possible to determine the extent of the damages sought in these state and federal lawsuits but the Company believes that these lawsuits are without merit. Accordingly, the Company is vigorously defending against them. Nevertheless, the Company believes that none of the legal proceedings resulting from the spill, individually or in the aggregate, would have a material effect on its financial position or results of operations.

Corporate operations

Carla Lacey, on behalf of herself and all other similarly situated stockholders of Southern Copper Corporation, and derivatively on behalf of Southern Copper Corporation

In April 2019, a derivative lawsuit was filed against the Company, certain current and former Directors, and Grupo Mexico in the Delaware Court of Chancery relating to certain construction contracts, contracts for the purchase and sale of minerals, and transportation contracts entered into between the Company’s subsidiaries and subsidiaries of Grupo Mexico.

In October 2019, the plaintiff amended the complaint to include claims related to certain administrative services contracts between the Company’s subsidiaries and Grupo Mexico. The amended complaint alleges, among other things, that the construction contracts, the mineral contracts, the transportation contracts, and the administrative services contracts were unfair as a result of breaches of fiduciary duties and the Company’s charter. The amended complaint also added Americas Mining Corporation (“AMC”) as a defendant, alleging that AMC breached its fiduciary duties as a controlling stockholder of the Company. The amended complaint seeks, among other things, unspecified monetary damages. In January 2020, the Company, the current and former Directors, and Grupo Mexico responded to the complaint by filing motions to dismiss. The Plaintiff filed a brief in response to the motions on March 13, 2020. On July 16, 2020, the Court denied the motions to dismiss the breach of fiduciary duty claims against the Directors. On October 6, 2020, the Court dismissed the Plaintiff’s claims against Grupo Mexico for lack of personal jurisdiction. On February 11, 2021, the Court granted the Directors’ motion to dismiss plaintiff’s breach of contract claim. The Court also granted AMC’s motion to dismiss all claims against AMC other than those related to the mineral contracts.

As of February 2021, because the Company has not reached a conclusion as to whether an unfavorable outcome is either probable or remote, the Company expresses no opinion as to the likelihood of an unfavorable outcome or the amount or range of any possible loss to the Company.

Labor matters:

Peruvian operations: 66% of the Company's 4,739 Peruvian employees were unionized at December 31, 2020. Currently, there are six separate unions, one large union and five smaller unions. In June 2018, the Company signed a three-year collective bargaining agreement with one of the smaller unions. This agreement includes, among other things, annual salary increases of 5% for each year starting September 2018, and a signing bonus of S/ 45,000 (approximately $13,600) which was recorded as labor expense. In August 2018, the Company signed a three-year collective bargaining agreement with three additional unions. This agreement includes, among other things, annual salary increases of 5% for each year starting December 2018, and a signing bonus of S/ 45,000 (approximately $13,600) which was recorded as labor expense. In March 2019, the Company resolved pending issues by means of an arbitration with one additional union. The arbitral award included annual salary increases of 5% for each year starting September 2018, and a signing bonus of S/45,000 (approximately $13,600) which was recorded as labor expense in the first quarter of 2019.

In May 2019, an arbitration resolved pending issues with the remaining union. The arbitral award included a salary increase of 5.5% beginning in September 2018 and a bonus of S/16,000 (approximately $4,800) for the one-year agreement, which was recorded as labor expense in the second quarter of 2019. In November 2019, the Company signed a collective bargaining agreement for three years with the same union. This agreement included, among other things, a salary increase of 5% for each year starting in September 2019 and a bonus of S/45,000 (approximately $13,300), which was recorded as labor expenses in the fourth quarter of 2019.

Mexican operations: In recent years, the Mexican operations have experienced a positive improvement in their labor environment, as workers opted to change their affiliation from the Sindicato Nacional de Trabajadores Mineros, Metalurgicos y Similares de la Republica Mexicana (the “National Mining Union”) to other less politicized unions.

The workers of the San Martin mine were on strike since July 2007. On February 28, 2018, the striking workers of the San Martín mine of IMMSA held an election to vote on the union that would hold the collective bargaining agreement at the San Martín mine. The Federacion Nacional de Sindicatos Independientes (the National Federation of Independent Unions) won the vote by a majority. Nevertheless, the vote was challenged by the National Mining Union. On June 26, 2018, the Federal Mediation and Arbitration Board issued a ruling recognizing the election results. Due to the agreement between workers and the Company to end the protracted strike, on August 22, 2018, the Federal Mediation and Arbitration Board authorized the restart of operations of the San Martín mine. Such authorization was challenged by the National Mining Union. On April 4, 2019, the Federal Mediation and Arbitration Board recognized, once again, the election results from February 28, 2018, by which the National Federation of Independent Unions won by a majority. In the last quarter of 2019, a Federal Court issued a resolution that established that the Labor Court should analyze the list of workers with the right to vote in the union election. The Company and the National Federation of Independent Unions challenged such determination before the Supreme Court of Justice and the case was still pending resolution as of December 31, 2020. The Company is working on a rehabilitation plan to restore operations at the San Martin mine with a budget of $97.7 million. As of December 31, 2020, the plan is underway with a total expense of $86.4 million.

In the case of the Taxco mine, its workers have been on strike since July 2007. After several legal procedures, in August 2015, the Supreme Court decided to assert jurisdiction over the case and to rule on it directly. As of December 31, 2020, the case remains pending resolution without further developments.

It is expected that operations at the Taxco mine will remain suspended until the labor issues are resolved. In view of the lengthy strike, the Company has reviewed the carrying value of the Taxco mine to ascertain whether impairment exists. The Company concluded that there is a non-material impairment of the assets located at this mine.

In 2020, a small group of workers at the Charcas mine claimed an additional workers’ participation payment and a minor incident was reported. This claim lacked a legal basis because the Company had completely fulfilled said obligation with the workers in question. Consequently, the Company took legal action and through conciliation and mediation with labor authorities, the incident concluded with no further repercussions for the Company.

Other legal matters:

The Company is involved in various other legal proceedings incidental to its operations, but the Company does not believe that decisions adverse to it in any such proceedings, individually or in the aggregate, would have a material effect on its financial position or results of operations.

Other commitments:

Peruvian Operations

Tia Maria:

On August 1, 2014, the Company received the final approval of Tia Maria’s Environmental Impact Assessment (“EIA”). On July 8, 2019, the Company received the construction permit for this 120,000 ton annual SX-EW copper greenfield project with a total capital budget of $1,400 million. This permit was obtained after completing an exhaustive review process, complying with all established regulatory requirements and addressing all observations raised.

On July 15, 2019, anti-mining groups staged a violent demonstration affecting economic as well as other activities in the Islay province. These actions were followed by the filing of three complaints, sponsored by groups opposing the Tia Maria project, with the Mining Council, which is the Peruvian administrative authority responsible for ruling on these complaints. The Mining Council temporarily suspended the construction permit on August 8, 2019. On October 7, 2019, as part of the process, the Mining Council conducted a hearing to hear the complaints and the Company’s position. On

October 30, 2019, the Mining Council of the Peruvian Ministry of Energy and Mines ratified the construction permit for the Tia Maria project.

The Company has been working to promote the welfare of the Islay province population. As part of these efforts, the Company has implemented social programs in education, healthcare and productive development to improve the quality-of-life in the region. The Company also has promoted agricultural and livestock activities in the Tambo Valley and supported growth in manufacturing, fishing and tourism in Islay.

During the construction and operation phase, the Company will make it a priority to hire local labor to fill the 9,000 jobs (3,600 direct and 5,400 indirect) that the Company expects to generate during Tia Maria’s construction phase. When operating, the Company expects Tia Maria to directly employ 600 workers and indirectly provide jobs for another 4,200. Additionally, from day one of its operations, the Company will generate significant contributions to revenues in the Arequipa region via royalties and taxes.

Tia Maria’s project budget is approximately $1.4 billion, of which $338.8 million has been invested through December 31, 2020. This project will use state-of-the-art SX-EW technology with the highest international environmental standards. SX-EW facilities are the most environmentally friendly in the industry as they do not require a smelting process and therefore, release no emissions into the atmosphere.

Michiquillay:

In June 2018, the Company signed a contract for the acquisition of the Michiquillay copper project in Cajamarca, Peru, at a purchase price of $400 million. Michiquillay is a world class mining project with estimated mineralized material of 1,150 million tons and a copper grade of 0.63%. It is expected to produce 225,000 tons of copper per year (along with by-products of molybdenum, gold and silver) for an initial mine life of more than 25 years.

The Company paid $12.5 million at the signing of the contract. The balance of $387.5 million will be paid if the Company decides to develop the project and it is not a present obligation.

Corporate Social Responsibility:

The Company has a corporate social responsibility policy to maintain and promote the continuity of its mining operations and obtain the best results. The main objective of this policy is to integrate the Company´s operations with local communities in the areas of influence of its operations by creating permanent positive relationships to develop optimum social conditions and promote sustainable development in the area. Accordingly, the Company has made the following commitments:

Tacna Region: In connection with the Toquepala concentrator expansion, the Company has committed to fund various social and infrastructure improvement projects in Toquepala's neighboring communities. The total amount committed for these purposes is S/ 445.0 million (approximately $122.8 million).

As the Toquepala expansion project has been completed, the Company considers that these commitments constitute present obligations of the Company and consequently has recorded a liability of $41.3 million in its consolidated financial statements as of December 31, 2020.

In addition, the Company has committed S/ 69.7 million (approximately $19.2 million) for the construction of one infrastructure project in the Tacna region under the “social investment for taxes” (obras por impuestos) program which allows the Company to use these amounts as an advance payment of taxes.

Moquegua Region: In the Moquegua region, the Company participates in a “development roundtable” with local municipal authorities and community representatives to discuss the social needs and the way the Company could contribute to sustainable development in the region. Currently, the roundtable is discussing the creation of a Moquegua Region Development Fund for which the Company has offered a contribution of S/ 1,000 million (approximately $275.9 million). While final funding is not yet settled, the Company has committed to contribute S/ 108.4 million (approximately $29.9 million) as an advance, which is being utilized to fund an educational project. In addition, there is a commitment to finance the construction of a residual water treatment plant in Ilo for S/ 78.0 million (approximately $21.5 million).

In addition, the Company has committed S/ 86.9 million (approximately $24.0 million) for the construction of two infrastructure projects in the Moquegua region under the “social investment for taxes” (obras por impuestos) program, which allows the Company to use these amounts as an advance payment of taxes.

Power purchase agreements:

● Electroperu S.A.: In June 2014, the Company entered into a power purchase agreement for 120 megawatt (“MW”) with the state power company Electroperu S.A., under which Electroperu S.A. began supplying energy for the Peruvian operations for twenty years starting on April 17, 2017.

● Kallpa Generacion S.A. (“Kallpa”): In July 2014, the Company entered into a power purchase agreement for 120MW with Kallpa, an independent Israeli owned power company, under which Kallpa will supply energy for the Peruvian operations for ten years starting on April 17, 2017 and ending on April 30, 2027. In May 2016, the Company signed an additional power purchase agreement for a maximum of 80MW with Kallpa, under which Kallpa began supplying energy for the Peruvian operations related to the Toquepala Expansion and other minor projects for ten years starting on May 1, 2017 and ending after ten years of commercial operation of the Toquepala Expansion or on April 30, 2029; whichever occurs first.

Mexican operations

Power purchase agreements:

● MGE: In 2012, the Company signed a power purchase agreement with MGE, an indirect subsidiary of Grupo Mexico, to supply power to some of the Company’s Mexican operations through 2032. For further information, please see Note 17 “Related party transactions”.

● Eolica el Retiro, S.A.P.I. de C.V.: In 2013, the Company signed a power purchase agreement with Eolica el Retiro, S.A.P.I de C.V. a windfarm energy producer that is an indirect subsidiary of Grupo Mexico, to supply power to some of the Company’s Mexican operations. For further information, please see Note 17 “Related party transactions”.

● Parque Eolico de Fenicias, S. de R.L. de C.V.: On February 20, 2020, the Company signed a power purchase agreement with Parque Eolico de Fenicias, S. de R.L. de C.V., an indirect subsidiary of Grupo Mexico, to supply 611,400 MWh of power per year to some of the Company´s Mexican operations for 20 years. This agreement will start in January 2021.

Corporate operations

Commitment for Capital projects:

As of December 31, 2020, the Company has committed approximately $365.8 million for the development of its capital investment projects.

Tax contingency matters:

Tax contingencies are provided for under ASC 740-10-50-15 Uncertain tax position (see Note 7 “Income taxes”).

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STOCKHOLDERS' EQUITY:

12 Months Ended

Dec. 31, 2020

STOCKHOLDERS' EQUITY:

STOCKHOLDERS' EQUITY:

NOTE 14—STOCKHOLDERS’ EQUITY

Treasury Stock:

Activity in treasury stock in the years 2020 and 2019 was as follows (in millions):

	2020		2019
Southern Copper common shares
Balance as of January 1,	$	2,767.9	$	2,768.3
Used for corporate purposes		(0.4)		(0.4)
Balance as of December 31,		2,767.5		2,767.9
Parent Company (Grupo Mexico) common shares
Balance as of January 1,		281.0		251.3
Other activity, including dividend, interest and foreign currency transaction effect		15.0		29.7
Balance as of December 31,		296.0		281.0
Treasury stock balance as of December 31,	$	3,063.5	$	3,048.9

SCC shares of common stock in treasury:

At December 31, 2020 and 2019, treasury stock holds 111,522,817 shares and 111,537,217 shares of SCC’s common stock with a cost of $2,767.5 million and $2,767.9 million, respectively. The shares of SCC’s common stock held in treasury are used for Director’s stock award plans and available for general corporate purposes.

SCC share repurchase program:

In 2008, the Company’s Board of Directors (“BOD”) authorized a $500 million share repurchase program that has since been increased by the BOD and is currently authorized to $3 billion. Pursuant to this program, the Company has purchased 119.5 million shares of common stock at a cost of $2.9 billion. These shares are available for general corporate purposes. The Company may purchase additional shares of its common stock from time to time, based on market conditions and other factors. This repurchase program has no expiration date and may be modified or discontinued at any time.

There has not been activity in the SCC share repurchase program since the third quarter of 2016. The NYSE closing price of SCC common shares at December 31, 2020 was $65.12 and the maximum number of shares that the Company could purchase at that price is 1.3 million shares.

Grupo Mexico’s direct and indirect ownership remains at 88.9% as of December 31, 2020.

Directors’ Stock Award Plan:

The Company established a stock award compensation plan for certain directors who are not compensated as employees of the Company. Under this plan, participants received 1,200 shares of common stock upon election and 1,200 additional shares following each annual meeting of stockholders thereafter. 600,000 shares of Southern Copper common stock have been reserved for this plan. On April 26, 2018, the Company’s stockholders approved a five-year extension of the Plan until January 28, 2023 and an increase of the shares award from 1,200 to 1,600. The fair value of the award is measured each year at the date of the grant. In 2020 and 2019 the stock-based compensation expense under this plan equaled $0.4 million for each of these years.

The activity of this plan for the years ended December 31, 2020 and 2019 was as follows:

	2020	2019
Total SCC shares reserved for the plan	600,000	600,000
Total shares granted at January 1,	(377,200)	(362,800)
Granted in the period	(14,400)	(14,400)
Total shares granted at December 31,	(391,600)	(377,200)
Remaining shares reserved	208,400	222,800

Parent Company common shares:

At December 31, 2020 and 2019, there were in treasury 87,598,097 and 93,082,532 of Grupo Mexico’s common shares, respectively.

Employee Stock Purchase Plan:

2015 Plan: In January 2015, the Company offered to eligible employees a new stock purchase plan through a trust that acquires series B shares of Grupo Mexico stock for sale to its employees, and employees of subsidiaries, and certain affiliated companies. The purchase price was established at 38.44 Mexican pesos (approximately $1.86) for the initial subscription, which expires in January 2023. Every two years employees will be able to acquire title to 50% of the shares paid in the previous two years. The employees will pay for shares purchased through monthly payroll deductions over the eight-year period of the plan. At the end of the eight-year period, the Company will grant the participant a bonus of 1 share for every 10 shares purchased by the employee. Any future subscription will be at the average market price at the date of acquisition or the grant date.

If Grupo Mexico pays dividends on shares during the eight-year period, the participants will be entitled to receive the dividend in cash for all shares that have been fully purchased and paid as of the date that the dividend is paid. If the participant has only partially paid for shares, the entitled dividends will be used to reduce the remaining liability owed for purchased shares.

In the case of voluntary or involuntary resignation/termination of the employee, the Company will pay to the employee the fair market sales price at the date of resignation of the fully paid shares, net of costs and taxes. When the fair market sales value of the shares is higher than the purchase price, the Company will apply a deduction over the amount to be paid to the employee based on a decreasing schedule specified in the plan.

In case of retirement or death of the employee, the Company will render the buyer or his legal beneficiary, the fair market sales value as of the date of retirement or death of the shares effectively paid, net of costs and taxes.

The stock-based compensation expense for the years ended December 31, 2020, 2019 and 2018 and the unrecognized compensation expense under this plan were as follows (in millions):

	2020		2019		2018
Stock based compensation expense	$	0.6	$	0.6	$	0.6
Unrecognized compensation expense	$	1.4	$	2.0	$	2.6

The following table presents the stock award activity of this plan for the years ended December 31, 2020 and 2019:

		Unit Weighted Average
	Shares	Grant Date Fair Value
Outstanding shares at January 1, 2020	1,379,734	$	2.63
Granted	—
Exercised	(115,324)	$	2.63
Forfeited	—		—
Outstanding shares at December 31, 2020	1,264,410	$	2.63
Outstanding shares at January 1, 2019	1,840,336	$	2.63
Granted	—		—
Exercised	(460,602)	$	2.63
Forfeited	—		—
Outstanding shares at December 31, 2019	1,379,734	$	2.63

2018 Plan: In November 2018, the Company offered to eligible employees a new stock purchase plan (the "New Employee Stock Purchase Plan") through a trust that acquires series B shares of Grupo Mexico stock for sale to its employees, and employees of subsidiaries, and certain affiliated companies. The purchase price was established at 37.89 Mexican pesos (approximately $1.86) for the initial subscription, which expires in October 2026. Every two years employees will be able to acquire title to 50% of the shares paid in the previous two years. The employees will pay for shares purchased through monthly payroll deductions over the eight-year period of the plan. At the end of the eight-year period, the Company will grant the participant a bonus of 1 share for every 10 shares purchased by the employee. Any future subscription will be at the average market price at the date of acquisition or the grant date.

If Grupo Mexico pays dividends on shares during the eight-year period, the participants will be entitled to receive the dividend in cash for all shares that have been fully purchased and paid as of the date that the dividend is paid. If the participant has only partially paid for shares, the entitled dividends will be used to reduce the remaining liability owed for purchased shares.

In the case of voluntary or involuntary resignation/termination of the employee, the Company will pay to the employee the fair market sales price at the date of resignation of the fully paid shares, net of costs and taxes. When the fair market sales value of the shares is higher than the purchase price, the Company will apply a deduction over the amount to be paid to the employee based on a decreasing schedule specified in the plan.

In case of retirement or death of the employee, the Company will render the buyer or his legal beneficiary, the fair market sales value as of the date of retirement or death of the shares effectively paid, net of costs and taxes.

The stock-based compensation expense for the years ended December 31, 2020 and 2019 and the unrecognized compensation expense under this plan were as follows (in millions):

	2020		2019
Stock based compensation expense	$	0.7	$	0.7
Unrecognized compensation expense	$	3.8	$	4.5

The following table presents the stock award activity of this plan for the years ended December 31, 2020 and 2019:

			Unit Weighted Average
	Shares		Grant Date Fair Value
Outstanding shares at January 1, 2020	4,002,898	$	1.86
Granted	—
Exercised	(84,440)	$	1.86
Forfeited	—
Outstanding shares at December 31, 2020	3,918,458	$	1.86
Outstanding shares at January 1, 2019	2,782,424	$	1.86
Granted	1,238,169	$	1.86
Exercised	(17,695)	$	1.86
Forfeited	—		—
Outstanding shares at December 31, 2019	4,002,898	$	1.86

Executive Stock Purchase Plan:

Grupo Mexico also offers a stock purchase plan for certain members of its executive management and the executive management of its subsidiaries and certain affiliated companies. Under this plan, participants will receive incentive cash bonuses which are used to purchase shares of Grupo Mexico which are deposited in a trust.

Retained earnings:

As part of the settlement of claims brought on behalf of the Company and its shareholders against Grupo Mexico, AMC and certain current and former directors (together with Grupo Mexico and AMC, the ‘‘Defendants’’) a dividend of $0.44428 per share was paid on February 21, 2019 to shareholders of record at the close of business on February 11, 2019, other than the Defendants. The settlement dividend, totaling $36.5 million was an obligation of Grupo Mexico and

AMC and therefore, has been funded by them. In addition, Grupo Mexico and AMC paid $13.5 million of legal fees.

Non-controlling interest:

For all the years presented, in the consolidated statement of earnings the income attributable to non-controlling interest is based on the earnings of the Company's Peruvian Branch.

The non-controlling interest of the Company’s Peruvian Branch is for investment shares. These shares were generated by legislation in place in Peru from the 1970s through 1991; such legislation provided for the participation of mining workers in the profits of the enterprises for which they worked. This participation was divided between equity and cash. The investment shares included in the non-controlling interest on the consolidated balance sheets reflect outstanding equity distributions made to the Peruvian Branch’s employees.

In prior years, the Company acquired some Peruvian investment shares in exchange for newly issued common shares of the Company and through purchases at market value. These acquisitions were accounted for as purchases of non-controlling interests. The excess paid over the carrying value was assigned to intangible assets and is being amortized based on production. As a result of these acquisitions, the remaining investment shareholders hold a 0.71% interest in the Peruvian Branch and are entitled to a pro rata participation in the cash distributions made by the Peruvian Branch. The shares are recorded as a non-controlling interest in the Company's financial statements.

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FAIR VALUE MEASUREMENT:

12 Months Ended

Dec. 31, 2020

FAIR VALUE MEASUREMENT:

FAIR VALUE MEASUREMENT:

NOTE 15—FAIR VALUE MEASUREMENT:

Subtopic 820-10 of ASC “Fair value measurement and disclosures -Overall” establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy under Subtopic 820-10 are described below:

Level 1 -Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

Level 2 -Inputs that are observable, either directly or indirectly, but do not qualify as Level 1 inputs. (i.e., quoted prices for similar assets or liabilities).

Level 3 -Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity).

The carrying amounts of certain financial instruments, including cash and cash equivalents, accounts receivable (other than accounts receivable associated with provisionally priced sales) and accounts payable approximate fair value due to their short maturities. Consequently, such financial instruments are not included in the following table that provides information about the carrying amounts and estimated fair values of other financial instruments that are not measured at fair value in the consolidated balance sheet as of December 31, 2020 and December 31, 2019 (in millions):

	At December 31, 2020				At December 31, 2019
	Carrying Value		Fair Value		Carrying Value		Fair Value
Liabilities:
Long-term debt level 1	$	6,193.6	$	8,692.1	$	6,190.6	$	7,675.3
Long-term debt level 2		350.6		385.7		750.2		776.1
Total long-term debt	$	6,544.2	$	9,077.8	$	6,940.8	$	8,451.4

Long-term debt is carried at amortized cost and its estimated fair value is based on quoted market prices classified as Level 1 in the fair value hierarchy except for the cases of the Yankee bonds and the notes due 2022, which qualify as Level 2 in the fair value hierarchy as they are based on quoted priced in market that are not active.

Fair values of assets and liabilities measured at fair value on a recurring basis were calculated as of December 31, 2020 and 2019, as follows (in millions):

	Fair Value at Measurement Date Using:
					Significant
	Fair Value		Quoted prices in		other		Significant
	as of		active markets for		observable		unobservable
	December 31,		identical assets		inputs		inputs
Description	2020		(Level 1)		(Level 2)		(Level 3)
Assets:
Short term investment:
—Trading securities	$	410.2	$	410.2	$	—	$	—
—Available-for-sale debt securities:
Corporate bonds		—		—		—		—
Asset backed securities		0.3		—		0.3		—
Mortgage backed securities		0.3		—		0.3		—
Accounts receivable:
—Embedded derivatives—Not classified as hedges:
Provisionally priced sales:
Copper		491.9		491.9		—		—
Molybdenum		129.2		129.2		—		—
Total	$	1,031.9	$	1,031.3	$	0.6	$	—

	Fair Value at Measurement Date Using:
					Significant
	Fair Value		Quoted prices in		other		Significant
	as of		active markets for		observable		unobservable
	December 31,		identical assets		inputs		inputs
Description	2019		(Level 1)		(Level 2)		(Level 3)
Assets:
Short term investment:
—Trading securities	$	80.0	$	80.0	$	—	$	—
—Available-for-sale debt securities:
Corporate bonds		—		—		—		—
Asset backed securities		0.4		—		0.4		—
Mortgage backed securities		0.3		—		0.3		—
Accounts receivable:
—Embedded derivatives-Not classified as hedges:
Provisionally priced sales:
Copper		326.5		326.5		—		—
Molybdenum		126.8		126.8		—		—
Total	$	534.0	$	533.3	$	0.7	$	—

The Company’s short-term trading securities investments are classified as Level 1 because they are valued using quoted prices of the same securities as they consist of bonds issued by public companies and publicly traded. The Company’s short-term available-for-sale investments are classified as Level 2 because they are valued using quoted prices for similar investments.

The Company’s accounts receivables associated with provisionally priced copper sales are valued using quoted market prices based on the forward price on the LME or on the COMEX. Such value is classified within Level 1 of the fair value hierarchy. Molybdenum prices are established by reference to the publication Platt’s Metals Week and are considered Level 1 in the fair value hierarchy.

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CONCENTRATION OF RISK

12 Months Ended

Dec. 31, 2020

CONCENTRATION OF RISK:

CONCENTRATION OF RISK:

NOTE 16—CONCENTRATION OF RISK:

The Company operates four open-pit copper mines, five underground poly-metallic mines, two smelters and ten refineries in Peru and Mexico and substantially all of its assets are located in these countries. No assurances can be made that any operations and assets of the Company that are subject to the jurisdiction of the governments of Peru and Mexico will not be adversely affected by future actions of such governments. Much of the Company’s products are exported from Peru and Mexico to customers principally in the United States, Europe, Asia and South America.

Financial instruments, which potentially subject the Company to a concentration of credit risk, consist primarily of cash and cash equivalents, short-term investments and trade accounts receivable. The Company invests or maintains available cash with various banks, principally in the United States, Mexico, Europe and Peru, or in commercial papers of highly-rated companies. As part of its cash management process, the Company regularly monitors the relative credit standing of these institutions. At December 31, 2020, SCC had invested its cash and cash equivalents and short-term investments as follows:

	$ in		% of total		% in one institution
Country	million		cash (1)		of country		of total cash
United States	$	1,968.8	75.9	%	14.1	%	10.7	%
Switzerland		340.3	13.1	%	79.4	%	10.4	%
Peru		35.5	1.4	%	81.4	%	1.1	%
Mexico		249.8	9.6	%	53.8	%	5.2	%
Total cash and short-term investment	$	2,594.4	100.0	%

(1) 97% of the Company’s cash is in U.S. dollars.

During the normal course of business, the Company provides credit to its customers. Although the receivables resulting from these transactions are not collateralized, the Company has not experienced significant problems with the collection of receivables.

The Company’s largest customers as percentage of accounts receivable and total sales were as follows:

	2020		2019		2018
Accounts receivable trade as of December 31,
Five largest customers	35.3	%	37.6	%	34.2	%
Largest customer	12.9	%	13.0	%	10.9	%
Total sales in year
Five largest customers	28.1	%	28.0	%	28.4	%
Largest customer	10.0	%	10.4	%	9.3	%

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RELATED PARTY TRANSACTIONS:

12 Months Ended

Dec. 31, 2020

RELATED PARTY TRANSACTIONS:

RELATED PARTY TRANSACTIONS:

NOTE 17—RELATED PARTY TRANSACTIONS:

The Company has entered into certain transactions in the ordinary course of business with parties that are controlling shareholders or their affiliates. These transactions include the lease of office space, air and railroad transportation, construction services, energy supply, and other products and services related to mining and refining. The Company lends and borrows funds among affiliates for acquisitions and other corporate purposes. These financial transactions bear interest and are subject to review and approval by senior management, as are all related party transactions. Article Nine of the Amended and Restated Certificate of Incorporation of the Company prohibits the Company from engaging in a Material Affiliate Transaction that was not the subject of prior review by a committee of the Board of Directors with at least three members, each of whom is independent, and defines a Material Affiliate Transaction as a transaction or series

of related transactions between Grupo Mexico or one of its affiliates (other than the Company or its subsidiaries), on the one hand, and the Company or one of its subsidiaries, on the other hand, that involves consideration of more than $10.0 million in the aggregate. It is the Company’s policy that (i) a Material Affiliate Transaction not be entered into or continued without the review and approval by the Audit Committee or its subcommittee of related party transactions comprised of independent directors,(ii) any potential related party transaction process with aggregate consideration between $8.0 million and $10.0 million be authorized by the General Counsel and Chief Financial Officer of the Company and (iii) all related party transactions, including any Material Affiliate Transaction, be reported to the Audit Committee of the Board of Directors or to its subcommittee of related party transactions.

Receivable and payable balances with related parties are shown below (in millions):

	At December 31,
	2020		2019
Related parties receivable current:
Grupo Mexico and affiliates:
Asarco LLC	$	5.3	$	10.8
AMMINCO Apoyo Administrativo, S.A. de C.V. (“AMMINCO”)		—		0.1
Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates		0.3		0.3
Grupo Mexico		2.7		2.7
Mexico Generadora de Energia S. de R.L. ("MGE")		14.4		15.3
Grupo Mexico Servicios de Ingenieria, S.A. de C.V.		0.2		0.2
Related to the controlling group:
Boutique Bowling de Mexico S.A. de C.V.		0.2		0.1
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport")		—		0.4
Operadora de Cinemas S.A. de C.V.		0.2		0.1
	$	23.3	$	30.0
Related parties receivable non-current:
Grupo Mexico and affiliates:
Asarco LLC	$	—		59.5
Related parties payable:
Grupo Mexico and affiliates:
Asarco LLC	$	13.9	$	4.3
AMMINCO		19.6		16.9
Eolica El Retiro, S.A.P.I. de C.V.		0.3		—
Ferrocarril Mexicano S.A. de C.V.		4.7		6.4
Grupo Mexico		0.9		1.1
MGE		40.8		40.2
Mexico Compania Constructora S.A de C.V.		22.9		16.0
Grupo Mexico Servicios de Ingenieria, S.A. de C.V.		0.7		—
Related to the controlling group:
Boutique Bowling de Mexico S.A. de C.V.		0.3		0.2
Mexico Transportes Aereos S.A. de C.V. (“Mextransport”)		0.1		1.2
Operadora de Cinemas S.A. de C.V.		0.1		0.1
	$	104.3	$	86.4

Purchase and sale activity:

Grupo Mexico and affiliates:

The following table summarizes the purchase and sale activities with Grupo Mexico and its affiliates in 2020, 2019 and 2018 (in millions):

	2020		2019		2018
Purchase activity
Asarco LLC	$	233.9	$	37.6	$	37.2
AMMINCO		18.6		17.8		8.0
Eolica El Retiro, S.A.P.I. de C.V.		1.0		2.9		3.6
Ferrocarril Mexicano, S.A. de C.V.		45.8		44.1		41.7
Grupo Mexico		10.0		10.0		10.1
MGE		213.3		202.2		200.1
Mexico Compania Constructora S.A de C.V.		42.6		60.3		72.9
Grupo Mexico Servicios de Ingenieria, S.A. de C.V.		11.1		10.7		6.9
Total purchases	$	576.3	$	385.6	$	380.5
Sales activity
Asarco LLC	$	77.9	$	11.3	$	81.8
AMMINCO		0.1		0.1		0.3
Ferrocarril Mexicano, S.A. de C.V.		—		0.1		—
MGE		54.9		47.4		68.2
Total sales	$	132.9	$	58.9	$	150.3

Grupo Mexico, the parent and the majority indirect stockholder of the Company, and its affiliates provide various services to the Company. These services are primarily related to accounting, legal, tax, financial, treasury, human resources, price risk assessment and hedging, purchasing, procurement and logistics, sales and administrative and other support services. The Company pays Grupo Mexico and AMMINCO, a subsidiary of Grupo Mexico, for these services and expects to continue requiring these services in the future.

In 2020 and 2019, the Company donated $7.1 million and $9.6 million, respectively, to Fundacion Grupo Mexico,A.C., an organization dedicated to promoting the social and economic development of the communities close to the Company’s Mexican operations.

The Company’s Mexican operations paid fees for freight services provided by Ferrocarril Mexicano, S.A de C.V. and for construction services provided by Mexico Compania Constructora S.A. de C.V., which are all subsidiaries of Grupo Mexico. Additionally, the Company´s Peruvian and Mexican operations paid fees for engineering services provided by Grupo Mexico Servicios de Ingenieria, S.A. de C.V., a subsidiary of Grupo Mexico.

The Company’s Mexican operations purchased copper concentrate and anodic slimes from Asarco LLC and also paid fees for tolling services. Additionally, the Company´s Mexican operations purchased power from MGE. Both companies are subsidiaries of Grupo Mexico.

In 2012, the Company signed a power purchase agreement with MGE, whereby MGE will supply some of the Company’s Mexican operations with power through 2032. MGE has two natural gas-fired combined cycle power generating units, with a net total capacity of 516.2 megawatts and has been supplying power to the Company since December 2013. Currently, MGE is supplying 2.3% of its power output to third-party energy users; compared to 5.2% at December 31, 2019.

In 2014, Mexico Generadora de Energia Eolica, S. de R.L. de C.V, an indirect subsidiary of Grupo Mexico, located in Oaxaca, Mexico, acquired Eolica el Retiro, a windfarm with 37 wind turbines. This company started operations in January 2014 and began to sell power to Industrial Minera Mexico, S.A. de C.V. and subsidiaries (IMMSA) and other subsidiaries of Grupo Mexico in the third quarter of 2014. Currently, Eolica el Retiro is supplying approximately 9.6% of its power output to IMMSA; compared to 18.2% at December 31, 2019.

The Company sold copper concentrate as well as sulfuric acid, silver and gold to Asarco LLC. In addition, in 2020 and 2019, the Company´s Mexican operations received rental fees from AMMINCO. In 2018, the Company´s Mexican operations sold vehicles to AMMINCO. In 2019, the Company´s Mexican operations sold an asset to Ferrocarril Mexicano, S.A. de C.V.

In September 2019, Asarco LLC signed a promissory agreement to pay to the Company´s Mexican operations $62.0 million plus interest no later than October 31, 2021, with quarterly payments of $0.5 million. The annual interest rate of the note was Libor plus 200 basis points, which would be reviewed annually. In November 2020, Asarco repaid this agreement. Related to this agreement, the Company recorded interest income of $2.2 and $2.3 million in 2020 and 2019, respectively.

The Company also received fees for natural gas and services provided to MGE, a subsidiary of Grupo Mexico. In May 2020, MGE signed a promissory note to pay to the Company´s Mexican operations 97.2 million Mexican pesos (approximately $5.1 million) plus interest. The annual interest rate of the note was 8.28% with monthly payments. MGE repaid this note in December 2020.

Companies with relationships with the controlling group:

The following table summarizes the purchase and sales activities with other Larrea family companies in 2020, 2019 and 2018 (in millions):

	2020		2019		2018
Purchase activity
Boutique Bowling de Mexico S.A. de C.V.	$	0.4	$	0.4	$	0.3
Mextransport		3.5		2.3		12.4
Operadora de Cinemas S.A. de C.V.		0.2		0.2		0.2
Total purchases	$	4.1	$	2.9	$	12.9
Sales activity
Boutique Bowling de Mexico S.A. de C.V.	$	0.1	$	0.1	$	0.2
Empresarios Industriales de Mexico, S.A. de C.V.		—		0.2		—
Mextransport		1.7		1.8		1.2
Operadora de Cinemas S.A. de C.V.		0.1		0.1		0.1
Total sales	$	1.9	$	2.2	$	1.5

The Larrea family controls a majority of the capital stock of Grupo Mexico, and has extensive interests in other businesses, including transportation, real estate and entertainment. The Company engages in certain transactions in the ordinary course of business with other entities controlled by the Larrea family relating to the lease of office space, air transportation and entertainment.

The Company’s Mexican operations paid fees for entertainment services provided by Boutique Bowling de Mexico S.A de C.V. and Operadora de Cinemas S.A. de C.V. Both companies are controlled by the Larrea family.

MexTransport provides aviation services to the Company’s Mexican operations. This is a company controlled by the Larrea family.

In addition, the Company received fees for building rental and maintenance services provided to Boutique Bowling de Mexico S.A de C.V. and Operadora de Cinemas S.A. de C.V. The Company´s Mexican operations received fees from Mextransport for reimbursement of maintenance expenses and for rental services. In 2019, The Company´s Mexican operations received fees for security services provided to Empresarios Industriales de Mexico, S.A. de C.V. This is also a company controlled by the Larrea family.

Equity Investment in Affiliate: The Company has a 44.2% participation in Compañia Minera Coimolache S.A. (“Coimolache”), which it accounts for on the equity method. Coimolache owns Tantahuatay, a gold mine located in northern Peru.

In addition, the Company has a 30.0% participation in Apu Coropuna S.R.L. (“Apu Coropuna”), which it accounts for

on the equity method. Apu Coropuna is a company, which undertakes exploration activities in the Pucay prospect, located in Arequipa, Peru.

It is anticipated that in the future the Company will enter into similar transactions with these same parties.

Companies with relationships with SCC executive officers:

In 2020, 2019 and 2018, the Company engaged in no purchase or sales activities with companies that have relationships with SCC executive officers.

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SEGMENT AND RELATED INFORMATION:

12 Months Ended

Dec. 31, 2020

SEGMENT AND RELATED INFORMATION:

SEGMENT AND RELATED INFORMATION:

NOTE 18—SEGMENT AND RELATED INFORMATION:

Company management views Southern Copper as having three reportable segments and manages it on the basis of these segments. The reportable segments identified by the Company are: the Peruvian operations, the Mexican open-pit operations and the Mexican underground mining operations segment identified as the IMMSA unit.

The three reportable segments identified are groups of mines, each of which constitute an operating segment, with similar economic characteristics, type of products, processes and support facilities, similar regulatory environments, similar employee bargaining contracts and similar currency risks. In addition, each mine within the individual group earns revenues from similar type of customers for their products and services and each group incurs expenses independently, including commercial transactions between groups.

Intersegment sales are based on arm’s length prices at the time of sale. These may not be reflective of actual prices realized by the Company due to various factors, including additional processing, timing of sales to outside customers and transportation cost. Added to the segment data is information regarding the Company’s sales. The segments identified by the Company are:

1. Peruvian operations, which include the Toquepala and Cuajone mine complexes and the smelting and refining plants, including a precious metals plant, industrial railroad and port facilities that service both mines. The Peruvian operations produce copper, with production of by-products of molybdenum, silver and other material.

2. Mexican open-pit operations, which include La Caridad and Buenavista mine complexes and the smelting and refining plants, including a precious metals plant and a copper rod plant and support facilities that service both mines. The Mexican open-pit operations produce copper, with production of by-products of molybdenum, silver and other material.

3. Mexican underground mining operations, which include five underground mines that produce zinc, copper, silver and gold, and a zinc refinery. This group is identified as the IMMSA unit.

The Peruvian operations include two open-pit copper mines whose mineral output is transported by rail to Ilo, Peru where it is processed at the Company’s Ilo smelter and refinery, without distinguishing between the products of the two mines. The resulting product, anodes and refined copper, are then shipped to customers throughout the world. These shipments are recorded as revenue of the Company’s Peruvian mines.

The Mexican open-pit segment includes two copper mines whose mineral output is processed in the same smelter and refinery without distinguishing between the products of the two mines. The resultant product, anodes and refined copper, are then shipped to customers throughout the world. These shipments are recorded as revenues of the Company’s Mexican open-pit mines.

The Company has determined that it is necessary to classify the Peruvian open-pit operations as an operating segment that is separate from the Mexican open-pit operations due to the very distinct regulatory and political environments in which they operate. The Company’s Chief Operating Decision Maker (“CODM”) must consider the operations in each country separately when analyzing results of the Company and making key decisions. The open-pit mines in Peru must comply with stricter environmental rules and must deal with a political climate that has a very distinct vision of the mining industry than that seen in Mexico. In addition, the collective bargaining agreement contracts are negotiated differently in each of the countries. These key differences result in the Company taking varying decisions with regard to open-pit operations in the two countries.

The IMMSA segment includes five mines whose minerals are processed in the same refinery. Sales of product from this segment are recorded as revenues of the Company’s IMMSA unit. While the Mexican underground mines are subject to a regulatory environment that is very similar to that applicable to Mexican open-pit mines, the nature of the products and processes of the two Mexican operations vary considerably. These differences cause the Company’s CODM to take a very different approach when analyzing results and making decisions regarding the two Mexican operations.

Financial information is regularly prepared for each of the three segments and the results of the Company’s operations are regularly reported to the CODM on the segment basis. The CODM of the Company focuses on operating income and on total assets as measures of performance to evaluate different segments and to make decisions to allocate resources to the reported segments. These are common measures in the mining industry.

Financial information relating to Company’s segments is as follows:

	Year Ended December 31, 2020
	(in millions)
			Mexican				Corporate, other
	Mexican		IMMSA		Peruvian		and
	Open-pit		Unit		Operations		eliminations		Consolidated
Net sales outside of segments	$	4,412.4	$	418.9	$	3,153.6	$	—	$	7,984.9
Intersegment sales				111.0				(111.0)		—
Cost of sales (exclusive of depreciation, amortization and depletion)		1,991.6		383.0		1,679.5		(124.3)		3,929.8
Selling, general and administrative		70.5		9.5		37.6		8.6		126.2
Depreciation, amortization and depletion		366.7		42.5		328.7		37.7		775.6
Exploration		2.5		8.6		9.4		12.1		32.6
Operating income	$	1,981.1	$	86.3	$	1,098.4	$	(45.1)		3,120.7
Less:
Interest, net										(347.4)
Other income (expense)										(27.5)
Income taxes										(1,174.4)
Equity earnings of affiliate										6.4
Non-controlling interest										(7.4)
Net income attributable to SCC									$	1,570.4
Capital investment	$	317.1	$	72.1	$	195.0	$	8.0	$	592.2
Property and mine development, net	$	4,470.5	$	548.2	$	3,735.1	$	704.9	$	9,458.7
Total assets	$	7,236.1	$	967.2	$	5,169.9	$	3,573.3	$	16,946.5

	Year Ended December 31, 2019
	(in millions)
			Mexican				Corporate, other
	Mexican		IMMSA		Peruvian		and
	Open-pit		Unit		Operations		eliminations		Consolidated
Net sales outside of segments	$	3,963.9	$	381.6	$	2,940.1	$	—	$	7,285.6
Intersegment sales		—		83.2		—		(83.2)		—
Cost of sales (exclusive of depreciation, amortization and depletion)		1,613.1		380.3		1,702.1		(89.1)		3,606.4
Selling, general and administrative		78.6		7.9		38.5		6.8		131.8
Depreciation, amortization and depletion		351.9		52.3		328.1		32.1		764.4
Exploration		1.8		9.0		16.5		2.7		30.0
Operating income	$	1,918.5	$	15.3	$	854.9	$	(35.7)		2,753.0
Less:
Interest, net										(319.5)
Other income (expense)										(7.0)
Income taxes										(945.3)
Equity earnings of affiliate										10.7
Non-controlling interest										(6.1)
Net income attributable to SCC									$	1,485.8
Capital investment	$	244.3	$	106.3	$	350.1	$	6.8	$	707.5
Property and mine development, net	$	4,648.5	$	497.1	$	3,879.2	$	346.2	$	9,371.0
Total assets	$	8,081.9	$	837.6	$	5,017.9	$	2,470.0	$	16,407.4

	Year Ended December 31, 2018
	(in millions)
			Mexican				Corporate, other
	Mexican		IMMSA		Peruvian		and
	Open-pit		Unit		Operations		eliminations		Consolidated
Net sales outside of segments	$	4,075.9	$	448.6	$	2,572.2	$	—	$	7,096.7
Intersegment sales		—		79.3		—		(79.3)		—
Cost of sales (exclusive of depreciation, amortization and depletion)		1,611.0		377.2		1,509.4		(88.6)		3,409.0
Selling, general and administrative		55.3		8.5		36.7		2.1		102.6
Depreciation, amortization and depletion		360.4		47.6		237.4		28.9		674.3
Exploration		2.0		5.3		18.5		3.8		29.6
Operating income	$	2,047.2	$	89.3	$	770.2	$	(25.5)		2,881.2
Less:
Interest, net										(261.1)
Other income (expense)										(30.7)
Income taxes										(1,053.5)
Equity earnings of affiliate										12.3
Non-controlling interest										(5.2)
Net income attributable to SCC									$	1,543.0
Capital investment	$	266.8	$	60.0	$	774.0	$	20.6	$	1,121.4
Property and mine development, net	$	4,783.8	$	448.3	$	3,797.2	$	374.5	$	9,403.8
Total assets	$	8,165.2	$	930.2	$	4,813.1	$	379.1	$	14,287.6

The following table presents information regarding the opening and closing balances of receivables by reporting segment of the Company for the three years ended December 31, 2020 (in millions):

			Mexican
	Mexican		IMMSA		Peruvian		Corporate &
	Open-Pit		Unit		Operations		Elimination		Consolidated
As of December 31, 2020:
Trade receivables	$	566.0	$	57.8	$	445.1	$	—	$	1,068.9
Related parties, current		15.4		—		0.8		7.1		23.3
As of December 31, 2019:
Trade receivables	$	477.8	$	38.0	$	317.1	$	—	$	832.9
Related parties, current		22.1		—		—		7.9		30.0
Related parties, non-current		59.5		—		—		—		59.5
As of December 31, 2018:
Trade receivables	$	505.9	$	50.5	$	266.0	$	—	$	822.4
Related parties		81.6		—		—		19.9		101.5

SALES VALUE PER SEGMENT:

The following table presents information regarding the sales value by reporting segment of the Company’s significant products for the three years ended December 31, 2020 (in millions):

	Year Ended December 31, 2020
			Mexican
	Mexican		IMMSA		Peruvian		Corporate, Other &		Total
	Open-pit		Unit		Operations		Eliminations		Consolidated
Copper	$	3,762.1	$	72.1	$	2,727.3	$	(48.4)	$	6,513.1
Molybdenum		275.2		—		235.1		—		510.3
Zinc		—		247.8		—		1.6		249.4
Silver		235.5		155.8		112.0		(55.5)		447.8
Other		139.6		54.2		79.2		(8.7)		264.3
Total	$	4,412.4	$	529.9	$	3,153.6	$	(111.0)	$	7,984.9

	Year Ended December 31, 2019
			Mexican
	Mexican		IMMSA		Peruvian		Corporate, Other &		Total
	Open-pit		Unit		Operations		Eliminations		Consolidated
Copper	$	3,314.9	$	42.0	$	2,535.3	$	(46.9)	$	5,845.3
Molybdenum		341.0		—		208.4		—		549.4
Zinc		—		280.1		—		(2.3)		277.8
Silver		185.9		82.7		85.6		(29.9)		324.3
Other		122.1		60.0		110.8		(4.1)		288.8
Total	$	3,963.9	$	464.8	$	2,940.1	$	(83.2)	$	7,285.6

	Year Ended December 31, 2018
			Mexican
	Mexican		IMMSA		Peruvian		Corporate, Other &		Total
(in millions)	Open-pit		Unit		Operations		Eliminations		Consolidated
Copper	$	3,459.1	$	45.6	$	2,251.2	$	(48.1)	$	5,707.8
Molybdenum		342.5		—		167.4		—		509.9
Zinc		—		328.7		—		(0.1)		328.6
Silver		175.3		83.5		69.5		(28.1)		300.2
Other		99.0		70.1		84.1		(3.0)		250.2
Total	$	4,075.9	$	527.9	$	2,572.2	$	(79.3)	$	7,096.7

NET SALES AND GEOGRAPHICAL INFORMATION:

The geographic breakdown of the Company’s sales for the three years ended December 31, 2020 was as follows (in millions):

	Year Ended December 31, 2020
			Mexican
	Mexican		IMMSA		Peruvian		Corporate &
	Open-Pit		Unit		Operations		Elimination		Consolidated
The Americas:
Mexico	$	1,296.6	$	341.1	$	—	$	(111.0)	$	1,526.7
United States		1,182.8		27.2		153.4		—		1,363.4
Peru		—		13.0		322.0		—		335.0
Brazil		—		18.7		214.3		—		233.0
Chile		18.8		—		202.3		—		221.1
Other American countries		36.8		2.9		2.7		—		42.4
Europe:
Switzerland		898.2		69.9		475.2		—		1,443.3
Italy		0.1		9.5		262.0		—		271.6
Spain		199.4		—		—		—		199.4
Other European countries		199.9		40.2		281.6		—		521.7
Asia:
Singapore		319.9		6.9		536.9		—		863.7
Japan		46.9		—		532.6		—		579.5
Other Asian countries		213.0		0.5		170.6				384.1
Total	$	4,412.4	$	529.9	$	3,153.6	$	(111.0)	$	7,984.9

	Year Ended December 31, 2019
			Mexican
	Mexican		IMMSA		Peruvian		Corporate &
	Open-Pit		Unit		Operations		Elimination		Consolidated
The Americas:
Mexico	$	1,262.2	$	352.9	$	—	$	(83.2)	$	1,531.9
United States		1,054.9		6.2		134.5		—		1,195.6
Peru		1.6		—		338.4		—		340.0
Brazil		—		17.3		194.4		—		211.7
Chile		1.2		—		190.1		—		191.3
Other American countries		37.6		2.2		3.3		—		43.1
Europe:
Switzerland		780.9		36.7		355.8		—		1,173.4
Italy		45.1		13.3		238.6		—		297.0
Spain		186.1		—		—		—		186.1
Other European countries		92.8		24.9		256.9		—		374.6
Asia:
Singapore		345.4		10.4		611.1		—		966.9
Japan		59.9		—		440.9		—		500.8
Other Asian countries		96.2		0.9		176.1		—		273.2
Total	$	3,963.9	$	464.8	$	2,940.1	$	(83.2)	$	7,285.6

	Year Ended December 31, 2018
			Mexican
	Mexican		IMMSA		Peruvian		Corporate &
	Open-Pit		Unit		Operations		Elimination		Consolidated
The Americas:
Mexico	$	1,343.0	$	385.6	$	—	$	(79.3)	$	1,649.3
United States		1,008.0		6.6		244.0		—		1,258.6
Peru		—		—		390.4		—		390.4
Brazil		—		43.8		228.1		—		271.9
Chile		—		—		136.3		—		136.3
Other American countries		60.6		3.8		1.4		—		65.8
Europe:
Switzerland		453.3		43.4		156.7		—		653.4
Italy		20.6		21.7		305.0		—		347.3
Spain		169.4		—		—		—		169.4
Other European countries		234.8		19.9		124.9		—		379.6
Asia:
Singapore		528.8		2.2		538.2		—		1,069.2
Japan		71.8		—		411.6		—		483.4
Other Asian countries		185.6		0.9		35.6		—		222.1
Total	$	4,075.9	$	527.9	$	2,572.2	$	(79.3)	$	7,096.7

PROVISIONAL SALES PRICE:

At December 31, 2020, the Company has recorded provisionally priced sales of copper at average forward prices per pound, and molybdenum at the year-end market price per pound. These sales are subject to final pricing based on the average monthly copper prices on the London Metal Exchange (“LME”) or New York Commodities Exchange (“COMEX”) and Dealer Oxide molybdenum prices in the future month of settlement.

Following are the provisionally priced copper and molybdenum sales outstanding at December 31, 2020:

	Sales volume	Priced at
	(million lbs.)	(per pound)	Month of settlement
Copper	139.8	3.52	January through April 2021
Molybdenum	12.9	10.03	January through March 2021

Provisional sales price adjustments included in accounts receivable and net sales were as follows at December, 31 (in millions):

	At December 31,
	2020		2019
Copper	$	17.4	$	4.0
Molybdenum		14.1		(8.2)
Total	$	31.5	$	(4.2)

Management believes that the final pricing of these sales will not have a material effect on the Company’s financial position or results of operations.

LONG-TERM SALES CONTRACTS:

The following are the significant outstanding long-term contracts:

In 2019, a three-year copper cathodes sales agreement was signed with Mitsui, with shipments beginning in 2020. Mitsui and the Company will negotiate market terms and conditions for annual contracts no later than November 30 of the year prior to shipment. The contract considers the following annual volumes of copper cathodes; 48,000 tons for each of the years from 2020 through 2022. Failure to reach an agreement on market terms would cancel the annual contract but not the long-term agreement. Under the terms of the agreement all shipments would be to Asia and no exclusivity rights for Mitsui or commissions are included. This contract may be renewed for additional years, upon the agreement of both parties.

Under the terms of a sales contract with Molymet Group (Molibdenos y Metales, S.A. and Sadaci N.V.), SPCC Peru Branch is required to supply approximately 70% of the molybdenum concentrates production from 2019 through 2022. The sale price of the molybdenum concentrate is based on the average of the High and Low “Daily Dealer Oxide” as published in “Platt’s Metals Daily”. The roasting charge deduction is agreed based on international market terms.

Under the terms of a sales contract with Molymex, S.A. de C.V., Operadora de Minas de Nacozari, S.A. de C.V. and Operadora de Minas e Instalaciones Mineras, S.A. de C. V. are required to supply at least the 80% of their molybdenum concentrates production from 2020 through 2023. The sale price of the molybdenum concentrate is based on the average of the High and Low “Daily Dealer Oxide” as published in “Platt’s Metals Daily.” The roasting charge deduction is negotiated based on international market terms.

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SUBSEQUENT EVENTS

12 Months Ended

Dec. 31, 2020

SUBSEQUENT EVENTS:

SUBSEQUENT EVENTS:

NOTE 19—SUBSEQUENT EVENTS:

DIVIDENDS:

On January 21, 2021, the Board of Directors authorized a dividend of $0.60 per share to be paid on February 24, 2021, to shareholders of record at the close of business on February 10, 2021.

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Schedule II - Valuation and Qualifying Accounts and Reserves

12 Months Ended

Dec. 31, 2020

Schedule II Valuation and Qualifying Accounts and Reserves

Schedule II Valuation and Qualifying Accounts and Reserves

Valuation and Qualifying Accounts and Reserves (in millions):

	Additions
	Balance at		Charged to
	beginning of		costs and		Deduction/	Balance at
	period		expenses	Additions	Application	end of period
Reserve deducted in balance sheet to which applicable:
Accounts Receivable:
2020	$	0.5	8.5	—	(0.2)	$	8.8
2019	$	0.5	—	—	—	$	0.5
2018	$	1.1	—	—	(0.6)	$	0.5
Notes issued under par:
2020	$	69.6	2.0	—	—	$	67.6
2019	$	58.8	1.9	12.7	—	$	69.6
2018	$	60.5	1.7	—	—	$	58.8
Valuation allowance:
2020	$	1,097.0	246.2	—	—	$	1,343.2
2019	$	819.1	277.9	—	—	$	1,097.0
2018	$	619.6	199.5	—	—	$	819.1

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Policies)

12 Months Ended

Dec. 31, 2020

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

Principles of consolidation

Principles of consolidation—

The consolidated financial statements include the accounts of subsidiaries of which the Company has voting control, in accordance with Accounting Standards Codification (“ASC”) 810 Consolidation. Such financial statements are prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP").

Use of estimates

Use of estimates—

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include the carrying value of ore reserves that are the basis for future cash flow estimates and amortization calculations; environmental reclamation, closure and retirement obligations; estimates of recoverable copper in mill and leach stockpiles; asset impairments (including estimates of future cash flows); unrecognized tax benefits; valuation allowances for deferred tax assets; and fair value of financial instruments. Management bases its estimates on the Company's historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Actual results could differ from those estimates.

Revenue recognition

Revenue recognition—

The Company accounts for a contract with a customer when there is a legally enforceable contract between the Company and the customer, the rights of the parties are identified, the contract has commercial substance, and collectability of the contract consideration is probable. The Company's revenues are measured based on consideration specified in the contract with each customer. Disclosures regarding disaggregation of revenues and contract balances are disclosed within Note 18 "Segment and related information".

The Company’s marketing strategy and annual sales planning emphasize developing and maintaining long-term customer relationships. Generally, 80% to 90% of the Company’s metal production is sold under annual or longer-term contracts, which specify a volume of mineral to be sold over a stated period and delivery schedule; the price at which mineral will be sold at each delivery date is generally determined by the weekly or monthly average rate of the commodity published by major metal exchanges at specific dates stipulated within each contract. The Company considers each contract to be a single performance obligation, represented by the delivery of a series of distinct goods that are substantially the same, with the same pattern of transfer to the Company’s customers. The Company concluded this as, based on the nature of its contracts, customers receive the benefit of mineral sold as it is shipped per the terms of the contracts at each contractual delivery date. Likewise, each shipment of product represents the same measure of progress as other shipments within the contract. Accordingly, the Company recognizes revenues for each contract over the period of time in which the specified quantity of mineral is delivered. In doing so, the Company considers that it has a right to consideration from its customers in an amount that corresponds directly to the value transferred to those customers that being the quantity of mineral delivered at the price per unit delivered. Accordingly, the Company recognizes revenue at the amount to which it has the right to invoice (the invoice practical expedient), as it believes that this method is a faithful depiction of the transfer of goods to its customers.

For contracts with a term greater than one year, the Company is unable to disclose an allocation of the transaction price to the remaining unsatisfied performance obligation, given that unit prices of mineral sold are determined by published commodity prices at specified dates within the contract. The volume of mineral to be delivered after the first year of the contract is subject to annual volume negotiations in accordance with the terms of the contract. As of December 31, 2020, the Company has long-term contracts with promises to deliver in 2021 for a total of 208,000 metric tons of copper concentrate, 48,000 metric tons of copper cathodes, 43,329 tons of molybdenum concentrate and 325,700 tons of sulfuric

acid. This is an estimate that will vary in 2022 and 2023 based on the negotiations with the customers as mentioned above.

The remainder of the Company’s revenues, including its by-product revenues, are generated by spot sales that are recognized at a point in time.

Under both sales models, revenue is recognized when or as the performance obligations are satisfied, when the Company transfers control of the goods and title passes to the customer. Considering the International Commercial Terms (Incoterms) utilized by the Company, control is transferred generally upon the completion of loading the material at the point of origin. This is the point at which the customer obtains legal title to the product as well as the ability to direct the use of and obtain substantially all of the remaining benefits of ownership of the asset. Additionally, payment is generally due upon the delivery of the shipping and title documents at the point of origin, customers typically have 30 days to remit payment. Copper and non-copper revenues are measured based on the monthly average of prevailing commodity prices according to the terms of the contracts. The Company provides allowances for doubtful accounts based upon historical bad debt and claims experience and periodic evaluation of specific customer accounts.

Substantially all of the Company’s sales are made under carriage and insurance paid to, or cost, insurance and freight Incoterms, whereby the Company is responsible for providing shipping and insurance after control of the inventory has been transferred to the customer. According to the terms of the Company’s contracts, these services are not distinct within the context of the contract, and they are not separately identifiable from the other promises within the contract. Additionally, it is the Company policy and it has a long-standing history of providing shipping and insurance services to its customers. Accordingly, shipping and insurance are not considered separate performance obligations. The related costs of shipping and insurance are presented within the cost of sales line in the accompanying consolidated statements of income.

Furthermore, the Company considered the impact of the shipping and insurance services on the determination of when control is transferred to its customers. It has concluded that the terms of these services do not impact its customers’ ability to sell, pledge, or otherwise use the products in shipment. Also, there is a small likelihood and minimal history of lost or damaged goods during shipment. Considering these factors, combined with the other indicators of control previously mentioned, the Company has concluded that these services do not impact the determination that control is transferred at the point of origin.

For certain of the Company’s sales of copper and molybdenum products, customer contracts allow for pricing based on a month subsequent to shipping, in most cases within the following three months and occasionally in some cases a few additional months. In such cases, revenue is recorded at a provisional price at the time of shipment. The provisionally priced copper sales are adjusted to reflect forward LME or COMEX copper prices at the end of each month until a final adjustment is made to the price of the shipments upon settlement with customers pursuant to the terms of the contract. In the case of molybdenum sales, for which there are no published forward prices, the provisionally priced sales are adjusted to reflect the market prices at the end of each month until a final adjustment is made to the price of the shipments upon settlement with customers pursuant to the terms of the contract.

These provisional pricing arrangements are accounted for separately from the contract as an embedded derivative instrument under ASC 815-30 “Derivatives and Hedging—Cash Flow Hedges.” The Company sells copper in concentrate, anode, blister and refined form at industry standard commercial terms. Net sales include the invoiced value of copper, zinc, silver, molybdenum, sulfuric acid and other metals and the corresponding fair value adjustment of the related forward contract of copper and molybdenum. Disclosure regarding adjustments to sales for provisionally priced contracts is disclosed within Note 18 “Segment and related information”.

Cash and cash equivalents

Cash and cash equivalents—

Cash and cash equivalents include bank deposits, certificates of deposit and short-term investment funds with original maturities of three months or less at the date of purchase. The carrying value of cash and cash equivalents approximates fair value.

Short-term investments

Short-term investments—

The Company accounts for short-term investments in accordance with ASC 320-10 “Investments Debt and Equity Securities-Recognition.” The Company determines the appropriate classification of all short-term investments as held-to-maturity, available-for-sale or trading at the time of purchase and re-evaluates such classifications as of each balance sheet date. Unrealized gains and losses on available-for-sale investments, net of taxes, are reported as a component of accumulated other comprehensive income (loss) in stockholders’ equity, unless such loss is deemed to be other than temporary.

Inventories

Inventories—

The Company principally produces copper and, in the production process, obtains several by-products, including molybdenum, silver, zinc, sulfuric acid and other metals.

Metal inventories, consisting of work-in-process and finished goods, are carried at the lower of average cost or net realizable value (NRV). Costs of work-in-process inventories and finished goods mainly include power, labor, fuel, operating and repair materials, depreciation, amortization, depletion, and other necessary costs related to the extraction and processing of ore, including mining, milling, concentrating, smelting, refining, leaching and chemical processing. Costs incurred in the production of metal inventories exclude general and administrative costs. Once molybdenum, silver, zinc and other by-products are identified, they are transferred to their respective production facilities and the incremental cost required to complete production is assigned to their inventory value.

Work-in-process inventories represent materials that are in the process of being converted into a saleable product. Conversion processes vary depending on the nature of the copper ore and the specific mining operation. For sulfide ores, processing includes milling and concentrating and results in the production of copper and molybdenum concentrates.

Finished goods include saleable products (e.g., copper concentrates, copper anodes, copper cathodes, copper rod, molybdenum concentrate and other metallurgical products).

Supplies inventories are carried at the lower of average cost or net realizable value (NRV).

Long-term inventory - Ore stockpiles on leach pads

Long-term inventory-Ore stockpiles on leach pads.

The leaching process is an integral part of the mining operations carried out at the Company’s open-pit mines. The Company capitalizes the production cost of leachable material at its Toquepala, La Caridad and Buenavista mines, recognizing it as inventory. This cost includes mining and haulage costs incurred to deliver ore to leach pads, depreciation, amortization, depletion and site overhead costs. The estimates of recoverable mineral content contained in the leaching dumps are supported by engineering studies. As the production cycle of the leaching process is significantly longer than the conventional process of concentrating, smelting and electrolytic refining, the Company includes current leach inventory (included in work-in-process inventories) and long-term leach inventory on its balance sheet. On January 1, 2020, the Company aligned its capitalization method for its Peruvian and Mexican operations to capitalize based on the allocation of copper content recoverable between ore and leach material. In addition, inventory consumption is now valued at the average unit cost, instead of the declining percentages of recovery method used previously. As a result of

these changes, during 2020 the value of capitalized material decreased by $196.4 million and consumption decreased by $29.3 million when compared to the previous capitalization method.

Management has evaluated ASC 250-10 and considered appropriate guidance to conclude that the aforementioned classifies as a change in accounting estimate, and therefore should affect accounting books prospectively. Management believes that this new method will result in a more accurate valuation of this material.

Property

Property—

Property is recorded at acquisition cost, net of accumulated depreciation and amortization. Cost includes major expenditures for improvements and replacements, which extend useful lives or increase capacity and interest costs associated with significant capital additions. Maintenance, repairs, normal development costs at existing mines and gains or losses on assets retired or sold are reflected in earnings as incurred.

Buildings and equipment are depreciated on the straight-line method over estimated lives from two to 50 years or the estimated life of the mine if shorter.

Mine development

Mine development—

Mine development includes primarily the cost of acquiring land rights to an exploitable ore body, pre-production stripping costs at new mines that are commercially exploitable, costs associated with bringing new mineral properties into production, and removal of overburden to prepare unique and identifiable areas outside the current mining area for such future production. Mine development costs are amortized on a unit of production basis over the remaining life of the mines.

Diverse practices exist in the mining industry relative to the treatment of drilling and other related costs to delineate new ore reserves. The Company follows the practices outlined in the next two paragraphs in its treatment of drilling and related costs.

Drilling and other associated costs incurred in the Company's efforts to delineate new resources, whether near-mine or Greenfield are expensed as incurred. These costs are classified as mineral exploration costs. Once the Company determines through feasibility studies that proven and probable reserves exist and that the drilling and other associated costs embody a probable future benefit that involves a capacity, singly or in combination with other assets, to contribute directly or indirectly to future net cash inflow, then the costs are classified as mine development costs. These mine development costs incurred prospectively to develop the property are capitalized as incurred, until the commencement of production, and are amortized using the units of production method over estimated life of the ore body. During the production stage, drilling and other related costs incurred to maintain production are included in production cost in the period in which they are incurred.

Drilling and other related costs incurred in the Company’s efforts to delineate a major expansion of reserves at an existing production property are expensed as incurred. Once the Company determines through feasibility studies that proven and probable incremental reserves exist and that the drilling and other associated costs embody a probable future benefit that involves a capacity, singly or in combination with other assets, to contribute directly or indirectly to future net cash inflow, then the costs are classified as mine development costs. These incremental mine development costs are capitalized as incurred, until the commencement of production and amortized using the units of production method over the estimated life of the ore body. A major expansion of reserves is one that increases total reserves at a property by approximately 10% or more.

For the years ended December 31, 2020, 2019 and 2018, the Company did not capitalize any drilling and related costs.

Asset retirement obligations (reclamation and remediation costs)

Asset retirement obligations (reclamation and remediation costs)—

The fair value of a liability for asset retirement obligations is recognized in the period in which the liability is incurred. The liability is measured at fair value and is adjusted to its present value in subsequent periods as accretion expense is recorded. The corresponding asset retirement costs are capitalized as part of the carrying value of the related long-lived assets and depreciated over the asset's useful life.

Intangible assets

Intangible assets—

Intangible assets include primarily the excess amount paid over the book value for investment shares, which are presented as mining concessions, and mining and engineering development studies. Intangible assets are carried at acquisition costs, net of accumulated amortization and are amortized principally on a unit of production basis over the estimated remaining life of the mines. Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable.

Debt issuance costs

Debt issuance costs—

Debt issuance costs related to a recognized debt liability are presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with the treatment of a debt discount.

Ore reserves

Ore reserves—

The Company periodically reevaluates estimates of its ore reserves, which represent the Company’s estimate as to the amount of unmined copper remaining in its existing mine locations that can be produced and sold at a profit. Such estimates are based on engineering evaluations derived from samples of drill holes and other openings, combined with assumptions about copper market prices and production costs at each of the respective mines.

The Company updates its estimate of ore reserves at the beginning of each year. In this calculation, the Company uses current metal prices which are defined as the average metal price over the preceding three years. The current price per pound of copper, as defined, was $2.816, $2.818 and $2.642 at the end of 2020, 2019 and 2018, respectively. The ore reserve estimates are used to determine the amortization of mine development and intangible assets.

Once the Company determines through feasibility studies that proven and probable reserves exist and that drilling and other associated costs embody a probable future benefit that involves a capacity, singly or in combination with other assets, to contribute directly or indirectly to future net cash inflow, then the costs are classified as mine development costs and the Company discloses the related ore reserves.

Exploration

Exploration—

Tangible and intangible costs incurred in the search for mineral properties are charged against earnings when incurred.

Income taxes

Income taxes—

Provisions for income taxes are based on taxes payable or refundable for the current year and deferred taxes on temporary differences between the amount of taxable income and pretax financial income and between the tax bases of assets and liabilities and their reported amounts in the financial statements. Deferred tax assets and liabilities are included in the financial statements at currently enacted income tax rates applicable to the period in which the deferred tax assets and liabilities are expected to be realized and settled as prescribed in ASC 740 “Income taxes.” As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

Deferred income tax assets are reduced by any benefits that, in the opinion of management, are more likely not to be realized.

The Company’s operations involve dealing with uncertainties and judgments in the application of complex tax regulations in multiple jurisdictions. The final taxes paid are dependent upon many factors, including negotiations with tax authorities in various jurisdictions and resolution of disputes arising from federal, state, and international tax audits. The Company recognizes potential liabilities and records tax liabilities for anticipated tax audit issues in the U.S. and other tax jurisdictions based on its estimate of whether, and the extent to which, additional taxes will be due. The Company follows the guidance of ASC 740 “Income taxes” to record these liabilities. (See Note 7 “Income taxes” of the consolidated financial statements for additional information). The Company adjusts these reserves in light of changing facts and circumstances; however, due to the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different from the Company’s current estimate of the tax liabilities. If its estimate of tax liabilities proves to be less than the ultimate assessment, an additional charge to expense would result. If payment of these amounts ultimately proves to be less than the recorded amounts, the reversal of the liabilities would result in tax benefits being recognized in the period when the Company determines the liabilities are no longer necessary.

The Company classifies income tax-related interest and penalties as income taxes in the financial statements, as well as interest and penalties, if any, related to unrecognized tax benefits.

Foreign exchange

Foreign exchange—

The Company’s functional currency is the U.S. dollar. As required by local law, both the Peruvian Branch and Minera Mexico maintain their books of accounts in Peruvian soles and Mexican pesos, respectively.

Foreign currency assets and liabilities are remeasured into U.S. dollars at current exchange rates, except for non-monetary items such as inventory, property, intangible assets and other assets which are remeasured at historical exchange rates. Revenues and expenses are generally translated at actual exchange rates in effect during the period, except for those items related to balance sheet amounts that are remeasured at historical exchange rates. Gains and losses from foreign currency remeasurement are included in earnings of the period.

Gains and (losses) resulting from foreign currency transactions are included in "Cost of sales (exclusive of depreciation, amortization and depletion)."

Asset impairments

Asset impairments -

The Company evaluates long-term assets when events or changes in economic circumstances indicate that the carrying amount of such assets may not be recoverable. These evaluations are based on business plans that are prepared using a time horizon that is reflective of the Company’s expectations of metal prices over its business cycle. The Company is currently using a long-term average copper price and an average molybdenum price for impairment tests, reflective of what the Company believes is the lower level of the current price environment. The results of its impairment tests using these long-term copper and molybdenum prices show no impairment in the carrying value of their assets.

In recent years testing using assumptions for long-term average prices have resulted in stricter evaluation for impairment analysis than would the higher three year average prices for copper and molybdenum prices. Should this situation reverse in the future with three-year average prices below the long-term price assumption, the Company would assess the need to use the three-year average prices in its evaluations. The Company uses an estimate of the future undiscounted net cash flows of the related asset or asset group over the remaining life to measure whether the assets are recoverable and measures any impairment by reference to fair value.

Other comprehensive income

Other comprehensive income—

Comprehensive income represents changes in equity during a period, except those resulting from investments by owners and distributions to owners. During the fiscal years ended December 31, 2020, 2019 and 2018, the components of "other comprehensive income (loss)" were, the unrecognized gain (loss) on employee benefit obligations and foreign currency translation adjustments.

Business segments

Business segments-

Company management views Southern Copper as having three reportable segments and manages it on the basis of these segments. The segments identified by the Company are: 1) the Peruvian operations, which include the two open-pit copper mines in Peru and the plants and services supporting such mines, 2) the Mexican open-pit copper mines, which include La Caridad and Buenavista mine complexes and their supporting facilities and 3) the Mexican underground mining operations, which include five underground mines that produce zinc, lead, copper, silver and gold, a coal mine and a zinc refinery. Please see Note 18 “Segments and Related Information.”

The Chief Operating Decision Maker of the Company focuses on operating income as measure of performance to evaluate different segments, and to make decisions to allocate resources to the reported segments. This is a common measure in the mining industry.

Leases

Leases -

The Company adopted FASB ASC 842, Leases, effective January 1, 2019. The Company determined if a contract is or contained a lease at its inception. The Company evaluated if a contract gave the right to obtain substantially all of the economic benefits from use of an identified asset and the right to direct the use of the asset, in order to determine if a contract contained a lease. All of the Company’s existing lease contracts are operating lease contracts. For these leases, the Company recognized right-of-use assets and the corresponding operating lease liabilities on its consolidated balance sheet. Right-of-use assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent an obligation by the Company to make lease payments which arise from the lease. Lease right-of-use assets and liabilities are recognized at the inception date based on the present value of lease payments over the lease term. As the Company’s lease contracts do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the inception date in order to determine the present value of lease payments. Lease expense for lease payments is recognized on a straight-line basis over the lease term, in the cost of sales and operating expenses. The Company elected the transition approach whereby it applied the new leases standard at the adoption date and recognized a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company elected the short-term lease recognition exemption (short-term lease practical expedient) by class of underlying asset (which results in off-balance-sheet accounting for the lease).

Credit losses

ADOPTION OF CREDIT LOSSES STANDARD

In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-13: “Financial Instruments – Credit Losses (Topic 326)”. This ASU was adopted on January 1, 2020. Prior to adopting this ASU, the Company applied an impairment methodology for accounts receivable arising from revenue transactions within the scope of ASC 606 that is consistent with the provision matrix model contemplated in the new standard. In addition, the new disclosure requirements do not apply to such trade receivables because the collection periods in all cases are less than one year. The Company’s accounts receivable from related parties under common control are excluded from the scope of this ASU. Accordingly, the adoption of this ASU did not have a material impact on the Company’s financial statements or related disclosures.

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SHORT-TERM INVESTMENTS: (Tables)

12 Months Ended

Dec. 31, 2020

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

Short-term investments were as follows ($ in millions):

	At December 31,
	2020			2019
Trading securities	$	410.2		$	80.0
Weighted average interest rate		0.4	%		2.0	%
Available-for-sale	$	0.6		$	0.7
Weighted average interest rate		0.7	%		0.7	%
Total	$	410.8		$	80.7

Summary of activity investments

The following table summarizes the activity of these investments by category (in millions):

	Years ended
	December 31,
	2020		2019
Trading:
Interest earned	$	0.7	$	0.6
Unrealized gain (loss) at the end of the period	$	(*)	$	(*)
Available-for-sale:
Interest earned		(*)		(*)
Investment redeemed	$	0.1	$	—

(*)   Less than $0.1 million

Schedule of contractual maturities of the Company's available-for-sale debt securities

At December 31, 2020 and 2019, contractual maturities of the available-for-sale debt securities are as follows (in millions):

	2020		2019
One year or less	$	—	$	—
Maturing after one year through five years		—		—
Maturing after five years through ten years		—		—
Due after 10 years		0.6		0.7
Total debt securities	$	0.6	$	0.7

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INVENTORIES: (Tables)

12 Months Ended

Dec. 31, 2020

INVENTORIES:

Schedule of inventories

	At December 31,
(in millions)	2020		2019
Inventory, current:
Metals at average cost:
Finished goods	$	50.8	$	87.2
Work-in-process		248.9		259.7
Ore stockpiles on leach pads		298.5		358.4
Supplies at average cost		352.0		363.2
Total current inventory	$	950.2	$	1,068.5
Inventory, long-term:
Ore stockpiles on leach pads	$	1,125.0	$	1,230.3

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PROPERTY: (Tables)

12 Months Ended

Dec. 31, 2020

PROPERTY:

Schedule of major classes of property, plant and equipment

	At December 31,
(in millions)	2020		2019
Buildings and equipment	$	15,561.9	$	15,016.1
Construction in progress		1,481.6		1,294.8
Mine development		272.8		267.5
Mineral assets		83.2		83.2
Land, other than mineral		235.8		200.1
Total property		17,635.3		16,861.7
Accumulated depreciation, amortization and depletion		(8,176.6)		(7,490.7)
Total property and mine development, net	$	9,458.7	$	9,371.0

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INTANGIBLE ASSETS: (Tables)

12 Months Ended

Dec. 31, 2020

INTANGIBLE ASSETS:

Schedule of major classes of intangible assets and goodwill

	At December 31,
(in millions)	2020		2019
Mining concessions	$	121.2	$	121.2
Mine engineering and development studies		19.8		19.8
Software		60.6		55.9
		201.6		196.9
Accumulated amortization:
Mining concessions		(38.6)		(38.0)
Mine engineering and development studies		(17.2)		(16.3)
Software		(44.7)		(36.1)
		(100.5)		(90.4)
Goodwill		41.9		41.9
Intangible assets, net	$	143.0	$	148.4

Schedule of estimated amortization of intangible assets for future periods

Estimated amortization expense (in millions):
2021	$	7.7
2022		5.2
2023		5.2
2024		4.3
2025		3.0
Total 2021 - 2025	$	25.4
Average annual	$	5.1

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INCOME TAXES: (Tables)

12 Months Ended

Dec. 31, 2020

INCOME TAXES:

Components of the provision for income taxes

(in millions)	2020		2019		2018
U.S. federal and state:
Current	$	—	$	—	$	2.6
Deferred		—		—		(13.0)
Uncertain tax positions		—		(1.3)		—
		—		(1.3)		(10.4)
Foreign (Peru and Mexico):
Current		1,237.9		966.3		1,102.4
Deferred		(63.5)		(30.1)		(38.5)
Uncertain tax positions		—		10.4		—
		1,174.4		946.6		1,063.9
Total provision for income taxes	$	1,174.4	$	945.3	$	1,053.5

Schedule of source of income

(in millions)	2020		2019		2018
Earnings by location:
U.S.	$	(15.3)	$	(1.9)	$	(2.3)
Foreign
Peru		723.9		513.0		441.8
Mexico		2,037.2		1,915.4		2,149.9
		2,761.1		2,428.4		2,591.7
Earnings before taxes on income	$	2,745.8	$	2,426.5	$	2,589.4

Reconciliation of the statutory income tax rate to the effective tax rate

The reconciliation of the statutory income tax rate to the effective tax rate for the three years ended December 31, 2020, is as follows (in percentage points):

	2020		2019		2018
Expected tax at U.S. statutory rate	21.0	%	21.0	%	21.0	%
Foreign tax at other than statutory rate, net of foreign tax credit benefit (1)	13.7		14.0		13.9
Percentage depletion	(2.2)		(2.7)		(2.1)
Other permanent differences	0.1		0.1		0.4
Change in 2017 valuation allowance on U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred taxes	—		—		7.5
Additional valuation allowance on 2018 U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred taxes	8.9		10.1		1.0
Decrease in 2017 U.S. deferred tax asset due to tax rate changes	—		—		(0.2)
U.S. one time transition tax on accumulated foreign earnings	—		—		0.4
Increase (decrease) in unrecognized tax benefits for uncertain tax positions	(0.1)		(2.1)		—
Amounts (over) / under provided in prior years	(0.1)		(1.1)		(1.3)
Other	1.5		(0.3)		0.1
Effective income tax rate	42.8	%	39.0	%	40.7	%

(1) Foreign tax at other than statutory rates, net of foreign tax credit benefit, also includes the effects of permanent differences in Peru and Mexico, that are determined at the local statutory rate.

Schedule of deferred tax assets and liabilities

	At December 31,
(in millions)	2020		2019
Assets:
Inventories	$	62.4	$	55.7
Capitalized exploration expenses		13.0		14.0
U.S. foreign tax credit carryforward, net of FIN 48 liability		974.1		731.8
U.S. tax effect of Peruvian deferred tax liability		111.2		131.3
Provisions		169.5		145.0
Mexican tax on consolidated dividends		—		9.0
Deferred workers participation		37.8		24.7
Accrued salaries, wages and vacations		8.5		10.0
Sales price adjustment (PUI)		(5.8)		3.0
Social responsibility expenses		4.3		2.1
Deferred charges		41.8		14.5
Valuation allowance on U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred		(1,343.2)		(1,097.0)
Other		19.5		9.9
Total deferred tax assets		93.1		54.0
	At December 31,
(in millions)	2020		2019
Liabilities:
Property, plant and equipment		(17.2)		(45.4)
Other		(5.3)		(3.0)
Total deferred tax liabilities		(22.5)		(48.4)
Total net deferred tax (liabilities) / assets	$	70.6	$	5.6

Summary of expiry of foreign tax credits

Year	Amount
2023		39.4
2024		102.0
2025		189.5
2026		107.0
2027		—
2028		159.6
2029		204.9
2030		237.6
Total	$	1,040.0

Schedule of reconciliation of amount of unrecognized tax benefits

The total amount of unrecognized tax benefits in 2020, 2019 and 2018, was as follows (in millions):

	2020		2019		2018
Unrecognized tax benefits, opening balance	$	58.4	$	214.5	$	214.5
Gross increases—tax positions in prior period		—		(7.5)		—
Gross increases—current-period tax positions		7.7		(4.2)		—
Decreases related to settlements with taxing authorities		—		(144.4)		—
		7.7		(156.1)		—
Unrecognized tax benefits, ending balance	$	66.1	$	58.4	$	214.5

Summary of tax years remaining open to examination and adjustment in major tax jurisdictions

Peru:	2014 and all subsequent years
U.S.:	2014 and all subsequent years
Mexico:	2015 and all subsequent years

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WORKERS' PARTICIPATION: (Tables)

12 Months Ended

Dec. 31, 2020

WORKERS' PARTICIPATION:

Schedule of workers' participation expense

Workers’ participation expense for the three years ended December 31, 2020 was as follows (in millions):

	2020		2019		2018
Current	$	248.5	$	188.8	$	219.9
Deferred		19.8		29.8		9.8
	$	268.3	$	218.6	$	229.7

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LEASES: (Tables)

12 Months Ended

Dec. 31, 2020

LEASES:

Schedule of the operating lease expense recognized

The operating lease expense recognized in the years ended December 31, 2020 and 2019 was classified as follows (in millions):

Classification	2020		2019
Cost of sales (exclusive of depreciation, amortization and depletion)	$	114.4	$	114.4
Selling, general and administrative		0.2		0.2
Exploration		0.2		0.2
Total lease expense	$	114.8	$	114.8

Schedule of Maturities of lease liabilities

	Lease liabilities
Year	(in millions)
2021	$	114.7
2022		113.7
2023		112.3
2024		104.7
2025		103.7
After 2025		723.0
Total lease payments	$	1,272.1
Less: interest on lease liabilities		(293.1)
Present value of lease payments	$	979.0

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ASSET RETIREMENT OBLIGATION: (Tables)

12 Months Ended

Dec. 31, 2020

ASSET RETIREMENT OBLIGATION:

Summary of asset retirement obligation activity

The following table summarizes the asset retirement obligation activity for the years ended December 31, 2020 and 2019 (in millions):

	2020		2019
Balance as of January 1	$	262.3	$	217.7
Changes in estimates		269.3		36.4
Closure payments		(1.2)		(5.3)
Accretion expense		14.6		13.5
Balance as of December 31,	$	545.0	$	262.3

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FINANCING: (Tables)

12 Months Ended

Dec. 31, 2020

FINANCING:

Schedule of long-term debt

Long-term debt (in millions):

							Carrying
							value as of
	Face		Issuance		Issuance		December 31,
	amount		discount		costs		2020
3.500% Senior unsecured notes due 2022	$	300		(0.2)	$	(0.3)	$	299.5
3.875% Senior unsecured notes due 2025		500		(1.3)		(1.2)		497.5
9.250% Yankee bonds due 2028		51.2		—		—		51.2
7.500% Senior unsecured notes due 2035		1,000		(12.0)		(8.0)		980.0
6.750% Senior unsecured notes due 2040		1,100		(6.9)		(5.6)		1,087.5
5.250% Senior unsecured notes due 2042		1,200		(18.6)		(6.2)		1,175.2
5.875% Senior unsecured notes due 2045		1,500		(16.1)		(8.5)		1,475.4
4.500% Minera Mexico Senior unsecured notes due 2050		1,000		(12.5)		(9.6)		977.9
Total	$	6,651.2	$	(67.6)	$	(39.4)		6,544.2
Less, current portion								—
Total long-term debt							$	6,544.2

							Carrying
							value as of
	Face		Issuance		Issuance		December 31,
	amount		discount		costs		2019
5.375% Senior unsecured notes due 2020	$	400		(0.1)	$	(0.1)	$	399.8
3.500% Senior unsecured notes due 2022		300		(0.3)		(0.5)		299.2
3.875% Senior unsecured notes due 2025		500		(1.6)		(1.5)		496.9
9.250% Yankee bonds due 2028		51		—		—		51.2
7.500% Senior unsecured notes due 2035		1,000		(12.4)		(8.3)		979.3
6.750% Senior unsecured notes due 2040		1,100		(7.1)		(5.7)		1,087.2
5.250% Senior unsecured notes due 2042		1,200		(19.0)		(6.3)		1,174.7
5.875% Senior unsecured notes due 2045		1,500		(16.4)		(8.6)		1,475.0
4.500% Minera Mexico Senior unsecured notes due 2050		1,000		(12.7)		(9.8)		977.5
Total	$	7,051	$	(69.6)	$	(40.8)		6,940.8
Less, current portion								(399.8)
Total long-term debt							$	6,541.0

Schedule of aggregate maturities of the outstanding borrowings

	Principal
Years	Due(*)
	(in millions)
2021	$	—
2022		300.0
2023		—
2024		—
2025		500.0
Thereafter		5,851.2
Total	$	6,651.2

(*)Total debt maturities do not include the debt discount valuation account of $107.0 million.

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BENEFIT PLANS: (Tables)

12 Months Ended

Dec. 31, 2020

Post retirement defined benefit plans and defined contribution plan

Components of net periodic benefit costs

Schedule of the components of net periodic benefit costs

(in millions)	2020		2019		2018
Service cost	$	1.4	$	1.1	$	1.0
Interest cost		1.7		1.8		1.6
Expected return on plan assets		(2.9)		(3.5)		(3.4)
Amortization of net actuarial loss		0.1		—		—
Amortization of prior service cost / (credit)		0.2		0.2		0.2
Settlement / Curtailment		(0.4)		—		(0.2)
Amortization of net loss/(gain)		0.2		0.3		0.2
Net periodic benefit cost	$	0.3	$	(0.1)	$	(0.6)

Schedule of changes in the benefit obligation and plan assets, the funded status of the plans and the amount recognized in balance sheet and accumulated other comprehensive income

	As of December 31,
(in millions)	2020		2019
Change in benefit obligation:
Projected benefit obligation at beginning of year	$	33.7	$	27.4
Service cost		1.4		1.1
Interest cost		1.7		1.8
Settlement		—		—
Benefits paid		(1.9)		(1.8)
Actuarial (gain)/loss		(4.2)		3.6
Actuarial gain assumption changes		0.8		0.9
Inflation adjustment		(1.6)		0.7
Projected benefit obligation at end of year	$	29.9	$	33.7
Change in plan assets:
Fair value of plan assets at beginning of year	$	51.6	$	46.7
Actual return on plan assets		6.5		4.8
Employer contributions		(0.6)		(0.6)
Benefits paid		(0.9)		(0.9)
Currency exchange rate adjustment		(2.2)		1.6
Fair value of plan assets at end of year	$	54.4	$	51.6
Funded status at end of year:	$	24.5	$	17.9
ASC-715 amounts recognized in statement of financial position consists of:
Non-current assets	$	24.5	$	17.9
Total	$	24.5	$	17.9
ASC-715 amounts recognized in accumulated other comprehensive income (net of income taxes of $(2.3) million and $(5.4) million in 2020 and 2019, respectively) consists of:
Net loss (gain)	$	3.0	$	7.6
Prior service cost		1.2		1.4
Total	$	4.2	$	9.0

Schedule of changes in accumulated other comprehensive income

(in millions)	2020		2019
Reconciliation of accumulated other comprehensive income:
Accumulated other comprehensive income at beginning of plan year	$	9.0	$	7.2
Net loss/(gain) amortized during the year		(4.1)		1.9
Net loss/(gain) occurring during the year		(0.3)		(0.2)
Prior service cost (credit)		—		—
Currency exchange rate adjustment		(0.4)		0.1
Net adjustment to accumulated other comprehensive income (net of income taxes of $3.1 million and $(2.2) million in 2020 and 2019, respectively)		(4.8)		1.8
Accumulated other comprehensive income at end of plan year	$	4.2	$	9.0

Summary of the amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of tax

(in millions)	2020		2019
Net loss / (gain)	$	(4.1)	$	1.8
Amortization of net (loss) gain		(0.3)		(0.2)
Amortization of prior services cost (credit)		—		—
Total amortization expenses	$	(4.4)	$	1.6

Schedule of assumptions used to determine the pension obligations and other post-retirement benefits

Expatriate Plan	2020		2019		2018
Discount rate	1.90	%	2.85	%	3.90	%
Expected long-term rate of return on plan asset	3.50	%	4.00	%	4.00	%
Rate of increase in future compensation level	N/A		N/A		N/A

Mexican Plan(*)	2020		2019		2018
Discount rate	7.43	%	7.15	%	8.45	%
Expected long-term rate of return on plan asset	7.43	%	7.15	%	8.45	%
Rate of increase in future compensation level	4.50	%	4.50	%	4.50	%

(*)These rates are based on Mexican pesos as pension obligations are denominated in this currency.

Scheduled maturities of the benefits expected to be paid in each of the next five years, and thereafter

	Expected
Years	Benefit Payments
	(in millions)
2021	$	3.1
2022		1.7
2023		1.8
2024		2.0
2025		1.8
2026 to 2028		12.5
Total	$	22.9

Post-retirement Health care plans

Components of net periodic benefit costs

Schedule of the components of net periodic benefit costs

(in millions)	2020		2019		2018
Interest cost	$	1.3	$	0.9	$	0.9
Amortization of prior service cost/ (credit)		—		(0.2)		(0.2)
Net periodic benefit cost	$	1.3	$	0.7	$	0.7

Schedule of changes in the benefit obligation and plan assets, the funded status of the plans and the amount recognized in balance sheet and accumulated other comprehensive income

	As of December 31,
(in millions)	2020		2019
Change in benefit obligation:
Projected benefit obligation at beginning of year	$	20.6	$	11.9
Interest cost		1.3		0.9
Actuarial loss/ (gain)-claims cost		—		—
Benefits paid		(1.5)		(1.3)
Actuarial (gain)/loss		4.5		8.6
Inflation adjustment		(1.1)		0.5
Projected benefit obligation at end of year	$	23.8	$	20.6
Change in plan assets:
Fair value of plan assets at beginning of year	$	—	$	—
Employer contributions		0.1		0.1
Benefits paid		(0.1)		(0.1)
Fair value of plan assets at end of year	$	—	$	—
Funded status at end of year:	$	23.8	$	20.6
ASC-715 amounts recognized in statement of financial position consists of:
Current liabilities	$	—	$	(0.1)
Non-current liabilities		(23.8)		(20.5)
Total	$	(23.8)	$	(20.6)
ASC-715 amounts recognized in accumulated other comprehensive income consists of:
Net loss (gain)	$	4.6	$	1.5
Total (net of income taxes of $(1.9) million and $(0.7) million in 2020 and 2019, respectively)	$	4.6	$	1.5

Schedule of changes in accumulated other comprehensive income

	As of December 31,
(in millions)	2020		2019
Reconciliation of accumulated other comprehensive income:
Accumulated other comprehensive income at beginning of plan year	$	1.5	$	(4.4)
Net loss/(gain) occurring during the year		3.2		6.0
Net loss/(gain) amortized during the year		—		0.1
Currency exchange rate adjustment		(0.1)		(0.2)
Net adjustment to accumulated other comprehensive income (net of income taxes of $(1.2) million and $(2.6) million in 2020 and 2019, respectively)		3.1		5.9
Accumulated other comprehensive income at end of plan year	$	4.6	$	1.5

Summary of the amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of tax

	As of December 31,
(in millions)	2020		2019
Net loss / (gain)	$	3.2	$	5.9
Amortization of net (loss) gain		—		0.2
Total amortization expenses	$	3.2	$	6.1

Schedule of assumptions used to determine the pension obligations and other post-retirement benefits

	2020		2019		2018
Expatriate health plan
Discount rate	1.90	%	2.85	%	3.90	%
Mexican health plan
Weighted average discount rate	7.43	%	7.15	%	8.45	%

Scheduled maturities of the benefits expected to be paid in each of the next five years, and thereafter

	Expected
Year	Benefit Payments
	(in millions)
2021	$	1.5
2022		1.6
2023		1.5
2024		1.5
2025		1.6
2026 to 2030		8.6
Total	$	16.3

Mexican Health Plan | Post retirement defined benefit plans and defined contribution plan

Components of net periodic benefit costs

Schedule of asset mix of the investment portfolio

	2020		2019
Asset category:
Treasury bills	78	%	80	%
Equity securities	22	%	20	%
	100	%	100	%

Mexican Health Plan | Post-retirement Health care plans

Components of net periodic benefit costs

Schedule of effects of one percentage-point change in assumed other benefits cost trend rates

	One Percentage
	Point
(in millions)	Increase		Decrease
Effect on total service and interest cost components	$	1.9	$	1.5
Effect on the post-retirement benefit obligation	$	24.7	$	22.2

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COMMITMENTS AND CONTINGENCIES: (Tables)

12 Months Ended

Dec. 31, 2020

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

Environmental capital investments in years 2020, 2019 and 2018, were as follows (in millions):

	2020		2019		2018
Peruvian operations (*)	$	(3.3)	$	18.6	$	59.3
Mexican operations		41.1		64.3		43.5
	$	37.8	$	82.9	$	102.8

(*)The activity in 2020 includes prepayment settlements classified to expenses.

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STOCKHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2020

Share based Compensation Plan

Schedule of activity in treasury stock

Activity in treasury stock in the years 2020 and 2019 was as follows (in millions):

	2020		2019
Southern Copper common shares
Balance as of January 1,	$	2,767.9	$	2,768.3
Used for corporate purposes		(0.4)		(0.4)
Balance as of December 31,		2,767.5		2,767.9
Parent Company (Grupo Mexico) common shares
Balance as of January 1,		281.0		251.3
Other activity, including dividend, interest and foreign currency transaction effect		15.0		29.7
Balance as of December 31,		296.0		281.0
Treasury stock balance as of December 31,	$	3,063.5	$	3,048.9

Schedule of activity in Directors' Stock Award Plan

	2020	2019
Total SCC shares reserved for the plan	600,000	600,000
Total shares granted at January 1,	(377,200)	(362,800)
Granted in the period	(14,400)	(14,400)
Total shares granted at December 31,	(391,600)	(377,200)
Remaining shares reserved	208,400	222,800

Employee Stock Purchase 2015 Plan

Share based Compensation Plan

Schedule of stock based compensation expense and unrecognized compensation expense

The stock-based compensation expense for the years ended December 31, 2020, 2019 and 2018 and the unrecognized compensation expense under this plan were as follows (in millions):

	2020		2019		2018
Stock based compensation expense	$	0.6	$	0.6	$	0.6
Unrecognized compensation expense	$	1.4	$	2.0	$	2.6

Schedule of stock award activity

		Unit Weighted Average
	Shares	Grant Date Fair Value
Outstanding shares at January 1, 2020	1,379,734	$	2.63
Granted	—
Exercised	(115,324)	$	2.63
Forfeited	—		—
Outstanding shares at December 31, 2020	1,264,410	$	2.63
Outstanding shares at January 1, 2019	1,840,336	$	2.63
Granted	—		—
Exercised	(460,602)	$	2.63
Forfeited	—		—
Outstanding shares at December 31, 2019	1,379,734	$	2.63

Employee Stock Purchase 2018 Plan

Share based Compensation Plan

Schedule of stock based compensation expense and unrecognized compensation expense

The stock-based compensation expense for the years ended December 31, 2020 and 2019 and the unrecognized compensation expense under this plan were as follows (in millions):

	2020		2019
Stock based compensation expense	$	0.7	$	0.7
Unrecognized compensation expense	$	3.8	$	4.5

Schedule of stock award activity

			Unit Weighted Average
	Shares		Grant Date Fair Value
Outstanding shares at January 1, 2020	4,002,898	$	1.86
Granted	—
Exercised	(84,440)	$	1.86
Forfeited	—
Outstanding shares at December 31, 2020	3,918,458	$	1.86
Outstanding shares at January 1, 2019	2,782,424	$	1.86
Granted	1,238,169	$	1.86
Exercised	(17,695)	$	1.86
Forfeited	—		—
Outstanding shares at December 31, 2019	4,002,898	$	1.86

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FAIR VALUE MEASUREMENT: (Tables)

12 Months Ended

Dec. 31, 2020

FAIR VALUE MEASUREMENT:

Schedule of carrying amount and estimated fair values of the Company's financial instruments

Consequently, such financial instruments are not included in the following table that provides information about the carrying amounts and estimated fair values of other financial instruments that are not measured at fair value in the consolidated balance sheet as of December 31, 2020 and December 31, 2019 (in millions):

	At December 31, 2020				At December 31, 2019
	Carrying Value		Fair Value		Carrying Value		Fair Value
Liabilities:
Long-term debt level 1	$	6,193.6	$	8,692.1	$	6,190.6	$	7,675.3
Long-term debt level 2		350.6		385.7		750.2		776.1
Total long-term debt	$	6,544.2	$	9,077.8	$	6,940.8	$	8,451.4

Schedule of fair values of assets and liabilities measured at fair value on a recurring basis

Fair values of assets and liabilities measured at fair value on a recurring basis were calculated as of December 31, 2020 and 2019, as follows (in millions):

	Fair Value at Measurement Date Using:
					Significant
	Fair Value		Quoted prices in		other		Significant
	as of		active markets for		observable		unobservable
	December 31,		identical assets		inputs		inputs
Description	2020		(Level 1)		(Level 2)		(Level 3)
Assets:
Short term investment:
—Trading securities	$	410.2	$	410.2	$	—	$	—
—Available-for-sale debt securities:
Corporate bonds		—		—		—		—
Asset backed securities		0.3		—		0.3		—
Mortgage backed securities		0.3		—		0.3		—
Accounts receivable:
—Embedded derivatives—Not classified as hedges:
Provisionally priced sales:
Copper		491.9		491.9		—		—
Molybdenum		129.2		129.2		—		—
Total	$	1,031.9	$	1,031.3	$	0.6	$	—

	Fair Value at Measurement Date Using:
					Significant
	Fair Value		Quoted prices in		other		Significant
	as of		active markets for		observable		unobservable
	December 31,		identical assets		inputs		inputs
Description	2019		(Level 1)		(Level 2)		(Level 3)
Assets:
Short term investment:
—Trading securities	$	80.0	$	80.0	$	—	$	—
—Available-for-sale debt securities:
Corporate bonds		—		—		—		—
Asset backed securities		0.4		—		0.4		—
Mortgage backed securities		0.3		—		0.3		—
Accounts receivable:
—Embedded derivatives-Not classified as hedges:
Provisionally priced sales:
Copper		326.5		326.5		—		—
Molybdenum		126.8		126.8		—		—
Total	$	534.0	$	533.3	$	0.7	$	—

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CONCENTRATION OF RISK: (Tables)

12 Months Ended

Dec. 31, 2020

CONCENTRATION OF RISK:

Schedule of concentration risk for cash equivalents and short- term investments

	$ in		% of total		% in one institution
Country	million		cash (1)		of country		of total cash
United States	$	1,968.8	75.9	%	14.1	%	10.7	%
Switzerland		340.3	13.1	%	79.4	%	10.4	%
Peru		35.5	1.4	%	81.4	%	1.1	%
Mexico		249.8	9.6	%	53.8	%	5.2	%
Total cash and short-term investment	$	2,594.4	100.0	%

(1) 97% of the Company’s cash is in U.S. dollars.

Schedule of company's largest customers as percentage of accounts receivable and total sales

	2020		2019		2018
Accounts receivable trade as of December 31,
Five largest customers	35.3	%	37.6	%	34.2	%
Largest customer	12.9	%	13.0	%	10.9	%
Total sales in year
Five largest customers	28.1	%	28.0	%	28.4	%
Largest customer	10.0	%	10.4	%	9.3	%

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RELATED PARTY TRANSACTIONS: (Tables)

12 Months Ended

Dec. 31, 2020

RELATED PARTY TRANSACTIONS:

Schedule of receivable and payable balances with related parties

Receivable and payable balances with related parties are shown below (in millions):

	At December 31,
	2020		2019
Related parties receivable current:
Grupo Mexico and affiliates:
Asarco LLC	$	5.3	$	10.8
AMMINCO Apoyo Administrativo, S.A. de C.V. (“AMMINCO”)		—		0.1
Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates		0.3		0.3
Grupo Mexico		2.7		2.7
Mexico Generadora de Energia S. de R.L. ("MGE")		14.4		15.3
Grupo Mexico Servicios de Ingenieria, S.A. de C.V.		0.2		0.2
Related to the controlling group:
Boutique Bowling de Mexico S.A. de C.V.		0.2		0.1
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport")		—		0.4
Operadora de Cinemas S.A. de C.V.		0.2		0.1
	$	23.3	$	30.0
Related parties receivable non-current:
Grupo Mexico and affiliates:
Asarco LLC	$	—		59.5
Related parties payable:
Grupo Mexico and affiliates:
Asarco LLC	$	13.9	$	4.3
AMMINCO		19.6		16.9
Eolica El Retiro, S.A.P.I. de C.V.		0.3		—
Ferrocarril Mexicano S.A. de C.V.		4.7		6.4
Grupo Mexico		0.9		1.1
MGE		40.8		40.2
Mexico Compania Constructora S.A de C.V.		22.9		16.0
Grupo Mexico Servicios de Ingenieria, S.A. de C.V.		0.7		—
Related to the controlling group:
Boutique Bowling de Mexico S.A. de C.V.		0.3		0.2
Mexico Transportes Aereos S.A. de C.V. (“Mextransport”)		0.1		1.2
Operadora de Cinemas S.A. de C.V.		0.1		0.1
	$	104.3	$	86.4

Grupo Mexico and affiliates

RELATED PARTY TRANSACTIONS:

Schedule of purchase and sales activities with related parties

The following table summarizes the purchase and sale activities with Grupo Mexico and its affiliates in 2020, 2019 and 2018 (in millions):

	2020		2019		2018
Purchase activity
Asarco LLC	$	233.9	$	37.6	$	37.2
AMMINCO		18.6		17.8		8.0
Eolica El Retiro, S.A.P.I. de C.V.		1.0		2.9		3.6
Ferrocarril Mexicano, S.A. de C.V.		45.8		44.1		41.7
Grupo Mexico		10.0		10.0		10.1
MGE		213.3		202.2		200.1
Mexico Compania Constructora S.A de C.V.		42.6		60.3		72.9
Grupo Mexico Servicios de Ingenieria, S.A. de C.V.		11.1		10.7		6.9
Total purchases	$	576.3	$	385.6	$	380.5
Sales activity
Asarco LLC	$	77.9	$	11.3	$	81.8
AMMINCO		0.1		0.1		0.3
Ferrocarril Mexicano, S.A. de C.V.		—		0.1		—
MGE		54.9		47.4		68.2
Total sales	$	132.9	$	58.9	$	150.3

Related to the controlling group

RELATED PARTY TRANSACTIONS:

Schedule of purchase and sales activities with related parties

The following table summarizes the purchase and sales activities with other Larrea family companies in 2020, 2019 and 2018 (in millions):

	2020		2019		2018
Purchase activity
Boutique Bowling de Mexico S.A. de C.V.	$	0.4	$	0.4	$	0.3
Mextransport		3.5		2.3		12.4
Operadora de Cinemas S.A. de C.V.		0.2		0.2		0.2
Total purchases	$	4.1	$	2.9	$	12.9
Sales activity
Boutique Bowling de Mexico S.A. de C.V.	$	0.1	$	0.1	$	0.2
Empresarios Industriales de Mexico, S.A. de C.V.		—		0.2		—
Mextransport		1.7		1.8		1.2
Operadora de Cinemas S.A. de C.V.		0.1		0.1		0.1
Total sales	$	1.9	$	2.2	$	1.5

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SEGMENT AND RELATED INFORMATION: (Tables)

12 Months Ended

Dec. 31, 2020

SEGMENT AND RELATED INFORMATION:

Schedule of financial information relating to Company's segments

	Year Ended December 31, 2020
	(in millions)
			Mexican				Corporate, other
	Mexican		IMMSA		Peruvian		and
	Open-pit		Unit		Operations		eliminations		Consolidated
Net sales outside of segments	$	4,412.4	$	418.9	$	3,153.6	$	—	$	7,984.9
Intersegment sales				111.0				(111.0)		—
Cost of sales (exclusive of depreciation, amortization and depletion)		1,991.6		383.0		1,679.5		(124.3)		3,929.8
Selling, general and administrative		70.5		9.5		37.6		8.6		126.2
Depreciation, amortization and depletion		366.7		42.5		328.7		37.7		775.6
Exploration		2.5		8.6		9.4		12.1		32.6
Operating income	$	1,981.1	$	86.3	$	1,098.4	$	(45.1)		3,120.7
Less:
Interest, net										(347.4)
Other income (expense)										(27.5)
Income taxes										(1,174.4)
Equity earnings of affiliate										6.4
Non-controlling interest										(7.4)
Net income attributable to SCC									$	1,570.4
Capital investment	$	317.1	$	72.1	$	195.0	$	8.0	$	592.2
Property and mine development, net	$	4,470.5	$	548.2	$	3,735.1	$	704.9	$	9,458.7
Total assets	$	7,236.1	$	967.2	$	5,169.9	$	3,573.3	$	16,946.5

	Year Ended December 31, 2019
	(in millions)
			Mexican				Corporate, other
	Mexican		IMMSA		Peruvian		and
	Open-pit		Unit		Operations		eliminations		Consolidated
Net sales outside of segments	$	3,963.9	$	381.6	$	2,940.1	$	—	$	7,285.6
Intersegment sales		—		83.2		—		(83.2)		—
Cost of sales (exclusive of depreciation, amortization and depletion)		1,613.1		380.3		1,702.1		(89.1)		3,606.4
Selling, general and administrative		78.6		7.9		38.5		6.8		131.8
Depreciation, amortization and depletion		351.9		52.3		328.1		32.1		764.4
Exploration		1.8		9.0		16.5		2.7		30.0
Operating income	$	1,918.5	$	15.3	$	854.9	$	(35.7)		2,753.0
Less:
Interest, net										(319.5)
Other income (expense)										(7.0)
Income taxes										(945.3)
Equity earnings of affiliate										10.7
Non-controlling interest										(6.1)
Net income attributable to SCC									$	1,485.8
Capital investment	$	244.3	$	106.3	$	350.1	$	6.8	$	707.5
Property and mine development, net	$	4,648.5	$	497.1	$	3,879.2	$	346.2	$	9,371.0
Total assets	$	8,081.9	$	837.6	$	5,017.9	$	2,470.0	$	16,407.4

	Year Ended December 31, 2018
	(in millions)
			Mexican				Corporate, other
	Mexican		IMMSA		Peruvian		and
	Open-pit		Unit		Operations		eliminations		Consolidated
Net sales outside of segments	$	4,075.9	$	448.6	$	2,572.2	$	—	$	7,096.7
Intersegment sales		—		79.3		—		(79.3)		—
Cost of sales (exclusive of depreciation, amortization and depletion)		1,611.0		377.2		1,509.4		(88.6)		3,409.0
Selling, general and administrative		55.3		8.5		36.7		2.1		102.6
Depreciation, amortization and depletion		360.4		47.6		237.4		28.9		674.3
Exploration		2.0		5.3		18.5		3.8		29.6
Operating income	$	2,047.2	$	89.3	$	770.2	$	(25.5)		2,881.2
Less:
Interest, net										(261.1)
Other income (expense)										(30.7)
Income taxes										(1,053.5)
Equity earnings of affiliate										12.3
Non-controlling interest										(5.2)
Net income attributable to SCC									$	1,543.0
Capital investment	$	266.8	$	60.0	$	774.0	$	20.6	$	1,121.4
Property and mine development, net	$	4,783.8	$	448.3	$	3,797.2	$	374.5	$	9,403.8
Total assets	$	8,165.2	$	930.2	$	4,813.1	$	379.1	$	14,287.6

Schedule of opening and closing balances of receivables by reporting segment

The following table presents information regarding the opening and closing balances of receivables by reporting segment of the Company for the three years ended December 31, 2020 (in millions):

			Mexican
	Mexican		IMMSA		Peruvian		Corporate &
	Open-Pit		Unit		Operations		Elimination		Consolidated
As of December 31, 2020:
Trade receivables	$	566.0	$	57.8	$	445.1	$	—	$	1,068.9
Related parties, current		15.4		—		0.8		7.1		23.3
As of December 31, 2019:
Trade receivables	$	477.8	$	38.0	$	317.1	$	—	$	832.9
Related parties, current		22.1		—		—		7.9		30.0
Related parties, non-current		59.5		—		—		—		59.5
As of December 31, 2018:
Trade receivables	$	505.9	$	50.5	$	266.0	$	—	$	822.4
Related parties		81.6		—		—		19.9		101.5

Schedule of sales value per segment

The following table presents information regarding the sales value by reporting segment of the Company’s significant products for the three years ended December 31, 2020 (in millions):

	Year Ended December 31, 2020
			Mexican
	Mexican		IMMSA		Peruvian		Corporate, Other &		Total
	Open-pit		Unit		Operations		Eliminations		Consolidated
Copper	$	3,762.1	$	72.1	$	2,727.3	$	(48.4)	$	6,513.1
Molybdenum		275.2		—		235.1		—		510.3
Zinc		—		247.8		—		1.6		249.4
Silver		235.5		155.8		112.0		(55.5)		447.8
Other		139.6		54.2		79.2		(8.7)		264.3
Total	$	4,412.4	$	529.9	$	3,153.6	$	(111.0)	$	7,984.9

	Year Ended December 31, 2019
			Mexican
	Mexican		IMMSA		Peruvian		Corporate, Other &		Total
	Open-pit		Unit		Operations		Eliminations		Consolidated
Copper	$	3,314.9	$	42.0	$	2,535.3	$	(46.9)	$	5,845.3
Molybdenum		341.0		—		208.4		—		549.4
Zinc		—		280.1		—		(2.3)		277.8
Silver		185.9		82.7		85.6		(29.9)		324.3
Other		122.1		60.0		110.8		(4.1)		288.8
Total	$	3,963.9	$	464.8	$	2,940.1	$	(83.2)	$	7,285.6

	Year Ended December 31, 2018
			Mexican
	Mexican		IMMSA		Peruvian		Corporate, Other &		Total
(in millions)	Open-pit		Unit		Operations		Eliminations		Consolidated
Copper	$	3,459.1	$	45.6	$	2,251.2	$	(48.1)	$	5,707.8
Molybdenum		342.5		—		167.4		—		509.9
Zinc		—		328.7		—		(0.1)		328.6
Silver		175.3		83.5		69.5		(28.1)		300.2
Other		99.0		70.1		84.1		(3.0)		250.2
Total	$	4,075.9	$	527.9	$	2,572.2	$	(79.3)	$	7,096.7

Schedule of net sales by countries

The geographic breakdown of the Company’s sales for the three years ended December 31, 2020 was as follows (in millions):

	Year Ended December 31, 2020
			Mexican
	Mexican		IMMSA		Peruvian		Corporate &
	Open-Pit		Unit		Operations		Elimination		Consolidated
The Americas:
Mexico	$	1,296.6	$	341.1	$	—	$	(111.0)	$	1,526.7
United States		1,182.8		27.2		153.4		—		1,363.4
Peru		—		13.0		322.0		—		335.0
Brazil		—		18.7		214.3		—		233.0
Chile		18.8		—		202.3		—		221.1
Other American countries		36.8		2.9		2.7		—		42.4
Europe:
Switzerland		898.2		69.9		475.2		—		1,443.3
Italy		0.1		9.5		262.0		—		271.6
Spain		199.4		—		—		—		199.4
Other European countries		199.9		40.2		281.6		—		521.7
Asia:
Singapore		319.9		6.9		536.9		—		863.7
Japan		46.9		—		532.6		—		579.5
Other Asian countries		213.0		0.5		170.6				384.1
Total	$	4,412.4	$	529.9	$	3,153.6	$	(111.0)	$	7,984.9

	Year Ended December 31, 2019
			Mexican
	Mexican		IMMSA		Peruvian		Corporate &
	Open-Pit		Unit		Operations		Elimination		Consolidated
The Americas:
Mexico	$	1,262.2	$	352.9	$	—	$	(83.2)	$	1,531.9
United States		1,054.9		6.2		134.5		—		1,195.6
Peru		1.6		—		338.4		—		340.0
Brazil		—		17.3		194.4		—		211.7
Chile		1.2		—		190.1		—		191.3
Other American countries		37.6		2.2		3.3		—		43.1
Europe:
Switzerland		780.9		36.7		355.8		—		1,173.4
Italy		45.1		13.3		238.6		—		297.0
Spain		186.1		—		—		—		186.1
Other European countries		92.8		24.9		256.9		—		374.6
Asia:
Singapore		345.4		10.4		611.1		—		966.9
Japan		59.9		—		440.9		—		500.8
Other Asian countries		96.2		0.9		176.1		—		273.2
Total	$	3,963.9	$	464.8	$	2,940.1	$	(83.2)	$	7,285.6

	Year Ended December 31, 2018
			Mexican
	Mexican		IMMSA		Peruvian		Corporate &
	Open-Pit		Unit		Operations		Elimination		Consolidated
The Americas:
Mexico	$	1,343.0	$	385.6	$	—	$	(79.3)	$	1,649.3
United States		1,008.0		6.6		244.0		—		1,258.6
Peru		—		—		390.4		—		390.4
Brazil		—		43.8		228.1		—		271.9
Chile		—		—		136.3		—		136.3
Other American countries		60.6		3.8		1.4		—		65.8
Europe:
Switzerland		453.3		43.4		156.7		—		653.4
Italy		20.6		21.7		305.0		—		347.3
Spain		169.4		—		—		—		169.4
Other European countries		234.8		19.9		124.9		—		379.6
Asia:
Singapore		528.8		2.2		538.2		—		1,069.2
Japan		71.8		—		411.6		—		483.4
Other Asian countries		185.6		0.9		35.6		—		222.1
Total	$	4,075.9	$	527.9	$	2,572.2	$	(79.3)	$	7,096.7

Schedule of provisionally priced copper and molybdenum sales outstanding

	Sales volume	Priced at
	(million lbs.)	(per pound)	Month of settlement
Copper	139.8	3.52	January through April 2021
Molybdenum	12.9	10.03	January through March 2021

Schedule of provisional sales price adjustments included in accounts receivable and net sales

Provisional sales price adjustments included in accounts receivable and net sales were as follows at December, 31 (in millions):

	At December 31,
	2020		2019
Copper	$	17.4	$	4.0
Molybdenum		14.1		(8.2)
Total	$	31.5	$	(4.2)

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DESCRIPTION OF THE BUSINESS: (Details) $ in Millions		12 Months Ended
	Apr. 15, 2020 USD ($)	Dec. 31, 2020 $ / lb $ / item
Percentage of ownership interest held by the parent company		88.90%
Percentage of operating over production capacity during COVID-19 time		0.98%
Copper price assumption | $ / lb		2.00
Molybdenum price assumption | $ / item		4.00
Minimum
Projected discounted cash flows in excess of the carrying amounts of long lived assets by margins		1.3
Maximum
Projected discounted cash flows in excess of the carrying amounts of long lived assets by margins		4.3
Fixed-rate senior unsecured notes issued April 2010
Repayment of debt | $	$ 400

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) item t segment $ / lb	Dec. 31, 2019 $ / lb	Dec. 31, 2018 $ / lb
Financial information related to segments
Decrease in inventory capitalized material | $	$ 196.4
Increase in inventory consumption | $	$ 29.3
Significant Accounting Policies
Increase in total reserves at a property to qualify as a major expansion (as a percent)	10.00%
Period considered for calculation of average metal price	3 years
Current price of copper (in dollars per pound) | $ / lb	2.816	2.818	2.642
Impairment in the carrying value of long-term assets | $	$ 0.0
Number of years of average prices for copper and molybdenum used for impairment analysis	3 years
Number of reportable segments | segment	3
Copper concentrates
Significant Accounting Policies
Long-term contracts with promises to deliver mineral	208,000
Copper cathodes
Significant Accounting Policies
Long-term contracts with promises to deliver mineral	48,000
Molybdenum concentrates
Significant Accounting Policies
Long-term contracts with promises to deliver mineral	43,329
Sulfuric acid
Significant Accounting Policies
Long-term contracts with promises to deliver mineral	325,700
Minimum
Financial information related to segments
Estimated useful lives of buildings and equipment	2 years
Significant Accounting Policies
Percentage of metal production sold under annual or longer-term contracts	80.00%
Maximum
Financial information related to segments
Maximum period after shipping within which pricing is based by customer contracts in most cases	3 months
Estimated useful lives of buildings and equipment	50 years
Significant Accounting Policies
Percentage of metal production sold under annual or longer-term contracts	90.00%
Peruvian Operations
Financial information related to segments
Number of open-pit copper mines | item	2
Mexican IMMSA Unit
Financial information related to segments
Number of underground poly metal mines | item	5

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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Short-term investment:
Trading securities	$ 410.2	$ 80.0
Weighted average interest rate (as a percent)	0.40%	2.00%
Available-for-sale	$ 0.6	$ 0.7
Weighted average interest rate (as a percent)	0.70%	0.70%
Total	$ 410.8	$ 80.7
Trading:
Interest earned	0.7	0.6
Available-for-sale:
Interest earned	19.2	21.2	$ 16.0
Investment redeemed	0.1
Contractual maturities of available-for-sale debt securities
Due after 10 years	0.6	0.7
Total debt securities	0.6	0.7
Maximum
Available-for-sale:
Interest earned	$ 0.1	$ 0.1

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INVENTORIES: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Metals at average cost:
Finished goods	$ 50.8	$ 87.2
Work-in-process	248.9	259.7
Ore stockpiles on leach pads	298.5	358.4
Supplies at average cost	352.0	363.2
Total current inventory	950.2	1,068.5
Inventory, long-term:
Ore stockpiles on leach pads	1,125.0	1,230.3
Total leaching costs added as long-term inventory of ore stockpiles in leach pads	194.0	469.0	$ 506.6
Long-term leaching inventories recognized as cost of sales	$ 359.1	$ 385.8	$ 299.4

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PROPERTY: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property
Total property	$ 17,635.3	$ 16,861.7
Accumulated depreciation, amortization and depletion	(8,176.6)	(7,490.7)
Total property and mine development, net	9,458.7	9,371.0	$ 9,403.8
Depreciation and depletion expense	766.4	759.9	$ 668.9
Buildings and equipment
Property
Total property	15,561.9	15,016.1
Construction in progress
Property
Total property	1,481.6	1,294.8
Mine development
Property
Total property	272.8	267.5
Mineral assets
Property
Total property	83.2	83.2
Land, other than mineral
Property
Total property	$ 235.8	$ 200.1

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INTANGIBLE ASSETS: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangible assets
Intangible assets excluding goodwill, gross	$ 201.6	$ 196.9
Accumulated amortization	(100.5)	(90.4)
Goodwill	41.9	41.9
Intangible assets, net	143.0	148.4
Amortization expense:
Amortization expense	9.2	4.5	$ 5.4
Estimated amortization expense:
2021	7.7
2022	5.2
2023	5.2
2024	4.3
2025	3.0
Total 2021-2025	25.4
Average annual	5.1
Buenavista del Cobre, S.A. de C.V
Intangible assets
Goodwill	17.0
El Pilar
Intangible assets
Goodwill	24.9
Mining concessions
Intangible assets
Intangible assets excluding goodwill, gross	121.2	121.2
Accumulated amortization	(38.6)	(38.0)
Mine engineering and development studies
Intangible assets
Intangible assets excluding goodwill, gross	19.8	19.8
Accumulated amortization	(17.2)	(16.3)
Software
Intangible assets
Intangible assets excluding goodwill, gross	60.6	55.9
Accumulated amortization	$ (44.7)	$ (36.1)

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INCOME TAXES: - TCJA (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2009
Income Taxes
Percentage of ownership by parent	88.90%
U.S. statutory rate (as a percent)	21.00%	21.00%	21.00%	35.00%
Maximum percentage of expenses excluding cost of goods sold	3.00%
Minimum
Income Taxes
BEAT tax rate (as a percent)			5.00%
Minimum | Years 2019 through 2025
Income Taxes
BEAT tax rate (as a percent)	10.00%
Minimum | Years thereafter
Income Taxes
BEAT tax rate (as a percent)	12.50%
AMC | Minimum
Income Taxes
Percentage of ownership by parent					80.00%

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INCOME TAXES: - Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
U.S. federal and state:
Current			$ 2.6
Deferred			(13.0)
Uncertain tax positions		$ (1.3)
Provision for income taxes		(1.3)	(10.4)
Foreign (Peru and Mexico):
Current	$ 1,237.9	966.3	1,102.4
Deferred	(63.5)	(30.1)	(38.5)
Uncertain tax position		10.4
Provision for income taxes	1,174.4	946.6	1,063.9
Total provision for income taxes	1,174.4	945.3	1,053.5
Earnings by location:
U.S.	(15.3)	(1.9)	(2.3)
Peru	723.9	513.0	441.8
Mexico	2,037.2	1,915.4	2,149.9
Foreign	2,761.1	2,428.4	2,591.7
Income before income taxes	$ 2,745.8	$ 2,426.5	$ 2,589.4

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INCOME TAXES: - Effective tax rate (Details) - item	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of the statutory income tax rate to the effective tax rate
Expected tax at U.S. statutory rate (as a percent)	21.00%	21.00%	21.00%	35.00%
Foreign tax at other than statutory rate, net of foreign tax credit benefit (as a percent)	13.70%	14.00%	13.90%
Percentage depletion (as a percent)	(2.20%)	(2.70%)	(2.10%)
Other permanent differences (as a percent)	0.10%	0.10%	0.40%
Change in 2017 valuation allowance on U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred taxes			7.50%
Additional valuation allowance on U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred taxes	8.90%	10.10%	1.00%
Decrease in U.S. deferred tax asset due to tax rate changes			(0.20%)
U.S. one time transition tax on accumulated foreign earnings			0.40%
Increase (decrease) in unrecognized tax benefits for uncertain tax positions (as a percent)	(0.10%)	(2.10%)
Amounts (over) / under provided in prior years	(0.10%)	(1.10%)	(1.30%)
Other (as a percent)	1.50%	(0.30%)	0.10%
Effective income tax rate	42.80%	39.00%	40.70%
Number of jurisdictions where company files income tax returns	3
Duration for which statutory tax rates for Peru and Mexico are considered to determine effective tax rate	3 years
Mexico
Reconciliation of the statutory income tax rate to the effective tax rate
Expected tax at U.S. statutory rate (as a percent)	30.00%	30.00%	30.00%
Peru
Reconciliation of the statutory income tax rate to the effective tax rate
Expected tax at U.S. statutory rate (as a percent)	29.50%	29.50%	29.50%

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INCOME TAXES: - Tax assets and liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets:
Inventories	$ 62.4	$ 55.7
Capitalized exploration expenses	13.0	14.0
U.S. foreign tax credit carryforward, net of FIN 48 liability	974.1	731.8
U.S. tax effect of Peruvian deferred tax liability	111.2	131.3
Provisions	169.5	145.0
Mexican tax on consolidated dividends		9.0
Deferred workers participation	37.8	24.7
Accrued salaries, wages and vacations	8.5	10.0
Sales price adjustment (PUI)	(5.8)	3.0
Social responsibility expenses	4.3	2.1
Deferred charges	41.8	14.5
Valuation allowance on U.S. deferred tax assets, foreign tax credits and U.S. tax effect on Peruvian deferred	(1,343.2)	(1,097.0)
Other	19.5	9.9
Total deferred tax assets	93.1	54.0
Liabilities:
Property, plant and equipment	(17.2)	(45.4)
Other	(5.3)	(3.0)
Total deferred tax liabilities	(22.5)	(48.4)
Total net deferred tax assets	70.6	$ 5.6
Increase in valuation allowance	$ 246.2
U.S. statutory rate (as a percent)	21.00%	21.00%	21.00%	35.00%

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INCOME TAXES: - Carryforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Foreign tax credits
Other U.S. tax credits	$ 0.0
Unrecognized Tax Benefits	$ 66.1	$ 58.4	$ 214.5
Income Tax Rate (as a percent)	21.00%	21.00%	21.00%	35.00%
Mexico
Foreign tax credits
Unrecognized Tax Benefits	$ 0.0
Income Tax Rate (as a percent)	30.00%	30.00%	30.00%
Peru
Foreign tax credits
Income Tax Rate (as a percent)	29.50%	29.50%	29.50%
Foreign
Foreign tax credits
Tax credits carryback period	1 year
Tax credits carryforward period	10 years
Increase in foreign tax credits	$ 15.9
Unrecognized Tax Benefits	66.1
Foreign tax credit carryforward	1,040.0
Foreign tax credit carryforward net of unrecognized tax benefit	973.9
2023 | Foreign
Foreign tax credits
Foreign tax credit carryforward	39.4
2024 | Foreign
Foreign tax credits
Foreign tax credit carryforward	102.0
2025 | Foreign
Foreign tax credits
Foreign tax credit carryforward	189.5
2026 | Foreign
Foreign tax credits
Foreign tax credit carryforward	107.0
2028 | Foreign
Foreign tax credits
Foreign tax credit carryforward	159.6
2029 | Foreign
Foreign tax credits
Foreign tax credit carryforward	204.9
2030 | Foreign
Foreign tax credits
Foreign tax credit carryforward	$ 237.6

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INCOME TAXES: - Other (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2021 USD ($)
Income Taxes
Total cash, cash equivalents and short-term investments	$ 2,594.4
Deferred tax asset	93.1	$ 54.0
State income tax liability	0.0
Withholding taxes due to the tax treaty between the United States and Mexico	0.0
Changes in unrecognized tax benefits
Unrecognized tax benefits, opening balance	58.4	214.5
Gross increases - tax positions in prior period		7.5
Gross increases - current-period tax positions	7.7
Gross decreases - current-period tax positions		(4.2)
Decreases related to settlements with taxing authorities		144.4
Increase (decrease) in unrecognized tax benefits	7.7	(156.1)
Unrecognized tax benefits, ending balance	66.1	58.4	$ 214.5
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate	$ 0.0
Number of major tax jurisdictions | item	3
Income tax expected to be paid				$ 0.6
Foreign subsidiaries
Income Taxes
Total cash, cash equivalents and short-term investments	$ 1,297.3
Deferred tax asset	200.0
Foreign
Changes in unrecognized tax benefits
Unrecognized tax benefits, ending balance	$ 66.1
Peru
Income Taxes
Royalty charge assessed as a percentage of net sales	1.00%
Royalty charges	$ 60.6	42.3	32.9
Provision for royalty tax	31.4	14.2	9.0
Peruvian special mining tax	$ 50.0	38.1	30.6
Changes in unrecognized tax benefits
Accrued interest and penalties included in liability for uncertain tax positions		$ 10.5	$ 1.9
Peru | Minimum
Income Taxes
Mining royalty tax (as a percent)	1.00%
Special mine tax (as a percent)	2.00%
Peru | Maximum
Income Taxes
Mining royalty tax (as a percent)	12.00%
Special mine tax (as a percent)	8.40%
Mexico
Income Taxes
Mining royalty tax (as a percent)	7.50%
Mining royalty amount on earnings before taxes	$ 60.1
Additional royalty tax over gross income from sales of gold, silver and platinum (as a percent)	0.50%
Additional royalty over sales revenue from gold, silver and platinum	$ 0.9
Changes in unrecognized tax benefits
Unrecognized tax benefits, ending balance	0.0
United States
Changes in unrecognized tax benefits
Accrued interest and penalties included in liability for uncertain tax positions	$ 0.0

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WORKERS' PARTICIPATION: (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Statutory workers' participation
Current	$ 248.5	$ 188.8	$ 219.9
Deferred	19.8	29.8	9.8
Workers' participation expense (in USD)	$ 268.3	$ 218.6	$ 229.7
Peru
Statutory workers' participation
Provision for workers' participation as a percentage of pre-tax earnings	8.00%
Number of months for which an individual worker's salary is capped for consideration of annual individual worker participation	18 months
Maximum taxable units contributed by employer to benefit fund (in Peruvian taxable units) | item	2,200
Maximum employer contribution to benefit fund (in USD)	$ 2.6
Mexico
Statutory workers' participation
Provision for workers' participation as a percentage of pre-tax earnings	10.00%

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LEASES: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases
Lessee, operating lease, option to extend	false
Lessee, operating lease, option to terminate	false
The weighted average remaining lease term	9 years
The weighted average discount rate	3.71%
Total lease expense	$ 114.8	$ 114.8
Short term lease costs	0.1
Maturities of lease liabilities
2021	114.7
2022	113.7
2023	112.3
2024	104.7
2025	103.7
After 2025	723.0
Total lease payments	1,272.1
Less: interest on lease liabilities	(293.1)
Lease liabilities	979.0
Cost of sales (exclusive of depreciation, amortization and depletion)
Leases
Total lease expense	114.4	114.4
Selling, general and administrative
Leases
Total lease expense	0.2	0.2
Exploration
Leases
Total lease expense	$ 0.2	$ 0.2
Minimum
Leases
Remaining lease terms	2 years
Maximum
Leases
Remaining lease terms	13 years

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ASSET RETIREMENT OBLIGATION: (Details) $ in Millions		12 Months Ended
	Jun. 24, 2019	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)
ASSET RETIREMENT OBLIGATION:
Maximum annual guarantees secured	50.00%
Percentage of guarantee for Lima complex		50.00%
Percentage of security for LOC		50.00%
Total guarantees		$ 56.5
Asset retirement obligation activity
Balance at the beginning of the year		262.3	$ 217.7
Changes in estimates		269.3	36.4
Closure Payments		(1.2)	(5.3)
Accretion expense		14.6	13.5
Balance at the end of the year		$ 545.0	$ 262.3
Peru
ASSET RETIREMENT OBLIGATION:
Period after which successive reviews are required by the law (in years)		5 years
Number of units with future closure costs recognized as an asset retirement obligation | item		3
Asset retirement obligation activity
Changes in estimates		$ 28.1
Mexico
Asset retirement obligation activity
Changes in estimates		$ 269.3

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FINANCING: (Details) $ in Millions		12 Months Ended	89 Months Ended
	Apr. 20, 2015 USD ($) tranche	Dec. 31, 2020 USD ($) item grade	Nov. 30, 2012 USD ($) item	Dec. 31, 2019 USD ($)	Sep. 26, 2019 USD ($)
FINANCING
Face amount		$ 6,651.2	$ 4,200.0	$ 7,051.0
Debt discount		67.6		69.6
Issuance costs	$ (11.8)	(39.4)		(40.8)
Long-term debt, Carrying Value		6,544.2		6,940.8
Less, current portion				399.8
Long-term debt, net of current portion		$ 6,544.2		6,541.0
Number of tranches | tranche	2
Underwriters discount	$ 20.2
Number of times for which senior unsecured notes were issued | item			6
Percentage of principal amount at which notes may be required to be repurchased in event of change of control in the entity		101.00%
Minimum
FINANCING
Number of decreased gradations that could cause a change of control triggering event | grade		1
5.375% Senior unsecured notes due 2020
FINANCING
Face amount				400.0
Debt discount				0.1
Issuance costs				(0.1)
Long-term debt, Carrying Value				$ 399.8
Interest rate (as a percent)				5.375%
3.500% Senior unsecured notes due 2022
FINANCING
Face amount		$ 300.0		$ 300.0
Debt discount		0.2		0.3
Issuance costs		(0.3)		(0.5)
Long-term debt, Carrying Value		$ 299.5		$ 299.2
Interest rate (as a percent)		3.50%		3.50%
3.875% Senior unsecured notes due 2025
FINANCING
Face amount	$ 500.0	$ 500.0		$ 500.0
Debt discount		1.3		1.6
Issuance costs		(1.2)		(1.5)
Long-term debt, Carrying Value		$ 497.5		$ 496.9
Interest rate (as a percent)	3.875%	3.875%		3.875%
9.250% Yankee Bonds due 2028
FINANCING
Face amount		$ 51.2		$ 51.0
Long-term debt, Carrying Value		$ 51.2		$ 51.2
Interest rate (as a percent)		9.25%		9.25%
9.250% Yankee Bonds due 2028 | Minera Mexico | Minimum
FINANCING
Ratio of EBITDA to interest expense | item		2.5
7.500% Senior unsecured notes due 2035
FINANCING
Face amount		$ 1,000.0		$ 1,000.0
Debt discount		12.0		12.4
Issuance costs		(8.0)		(8.3)
Long-term debt, Carrying Value		$ 980.0		$ 979.3
Interest rate (as a percent)		7.50%		7.50%
6.750% Senior unsecured notes due 2040
FINANCING
Face amount		$ 1,100.0		$ 1,100.0
Debt discount		6.9		7.1
Issuance costs		(5.6)		(5.7)
Long-term debt, Carrying Value		$ 1,087.5		$ 1,087.2
Interest rate (as a percent)		6.75%		6.75%
5.250% Senior unsecured notes due 2042
FINANCING
Face amount		$ 1,200.0		$ 1,200.0
Debt discount		18.6		19.0
Issuance costs		(6.2)		(6.3)
Long-term debt, Carrying Value		$ 1,175.2		$ 1,174.7
Interest rate (as a percent)		5.25%		5.25%
5.875% Senior unsecured notes due 2045
FINANCING
Face amount	$ 1,500.0	$ 1,500.0		$ 1,500.0
Debt discount		16.1		16.4
Issuance costs		(8.5)		(8.6)
Long-term debt, Carrying Value		$ 1,475.4		$ 1,475.0
Interest rate (as a percent)	5.875%	5.875%		5.875%
Fixed-rate senior unsecured notes issued in April 2015
FINANCING
Face amount	$ 2,000.0
4.500% Minera Mexico Senior unsecured notes due 2050
FINANCING
Face amount		$ 1,000.0		$ 1,000.0
Debt discount		12.5		12.7
Issuance costs		(9.6)		(9.8)
Long-term debt, Carrying Value		$ 977.9		$ 977.5
Interest rate (as a percent)		4.50%		4.50%
4.500% Minera Mexico Senior unsecured notes due 2050 | Minera Mexico S.A. de C.V. Notes
FINANCING
Face amount					$ 1,000.0
Debt discount					12.7
Issuance costs					$ (9.8)
Interest rate (as a percent)					4.50%

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FINANCING: - Outstanding borrowing (Details) $ in Millions	Dec. 31, 2020 USD ($)
Aggregate maturities of the outstanding borrowings
2022	$ 300.0
2025	500.0
Thereafter	5,851.2
Total	6,651.2
Debt discount valuation account	$ 107.0

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BENEFIT PLANS: - Other (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) plan	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Benefit plans
Number of noncontributory defined benefit pension plans | plan	2
Post retirement defined benefit plans and defined contribution plan
Defined benefit plan, net periodic benefit costs
Service cost	$ 1.4	$ 1.1	$ 1.0
Interest cost	1.7	1.8	1.6
Expected return on plan assets	(2.9)	(3.5)	(3.4)
Amortization of net actuarial loss	0.1
Amortization of prior service cost (credit)	0.2	0.2	0.2
Settlement / Curtailment	(0.4)		(0.2)
Amortization of net loss (gain)	0.2	0.3	0.2
Net periodic benefit cost	0.3	(0.1)	(0.6)
Change in benefit obligation:
Projected benefit obligation at beginning of year	33.7	27.4
Service cost	1.4	1.1	1.0
Interest cost	1.7	1.8	1.6
Benefits paid	(1.9)	(1.8)
Actuarial (gain)/loss	(4.2)	3.6
Actuarial gain assumption changes	0.8	0.9
Inflation adjustment	(1.6)	0.7
Projected benefit obligation at end of year	29.9	33.7	27.4
Change in plan assets:
Fair value of plan assets at beginning of year	51.6	46.7
Actual return on plan assets	6.5	4.8
Employer contributions	(0.6)	(0.6)
Benefits paid	(0.9)	(0.9)
Currency exchange rate adjustment	(2.2)	1.6
Fair value of plan assets at end of year	54.4	51.6	46.7
Funded status at end of year				$ 24.5	$ 17.9
Amounts recognized in statement of financial position
Non-current assets				24.5	17.9
Total				24.5	17.9
Amounts recognized in accumulated other comprehensive income
Net loss (gain)				3.0	7.6
Prior service cost (credit)				1.2	1.4
Total, net of tax	9.0	7.2	7.2	4.2	9.0
Net loss (gain), income taxes				(2.3)	(5.4)
Reconciliation of accumulated other comprehensive income:
Accumulated other comprehensive income at beginning of plan year	9.0	7.2
Net loss/(gain) amortized during the year	(4.1)	1.9
Net loss/(gain) occurring during the year	(0.3)	(0.2)
Currency exchange rate adjustment	(0.4)	0.1
Net adjustment to accumulated other comprehensive income	(4.8)	1.8
Accumulated other comprehensive income at end of plan year	4.2	9.0	$ 7.2
Net adjustment to accumulated other comprehensive income, income taxes	3.1	(2.2)
Amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of income tax
Net loss / (gain)	(4.1)	1.8
Amortization of net (loss) gain	(0.3)	(0.2)
Total amortization expenses	$ (4.4)	$ 1.6
Expected Benefit Payments
2021				3.1
2022				1.7
2023				1.8
2024				2.0
2025				1.8
2026 to 2028				12.5
Total				22.9
Post retirement defined benefit plans and defined contribution plan | Expatriate Plan
Assumptions used to determine the pension obligation and other post-retirement benefits and cost
Discount rate (as a percent)	1.90%	2.85%	3.90%
Expected long-term rate of return on plan asset (as a percent)	3.50%	4.00%	4.00%
Post retirement defined benefit plans and defined contribution plan | Mexican Health Plan
Assumptions used to determine the pension obligation and other post-retirement benefits and cost
Discount rate (as a percent)	7.43%	7.15%	8.45%
Expected long-term rate of return on plan asset (as a percent)	7.43%	7.15%	8.45%
Rate of increase in future compensation level (as a percent)	4.50%	4.50%	4.50%
Post-retirement Health care plans
Defined benefit plan, net periodic benefit costs
Interest cost	$ 1.3	$ 0.9	$ 0.9
Amortization of prior service cost (credit)		(0.2)	(0.2)
Net periodic benefit cost	1.3	0.7	0.7
Change in benefit obligation:
Projected benefit obligation at beginning of year	20.6	11.9
Interest cost	1.3	0.9	0.9
Benefits paid	(1.5)	(1.3)
Actuarial (gain)/loss	4.5	8.6
Inflation adjustment	(1.1)	0.5
Projected benefit obligation at end of year	23.8	20.6	11.9
Change in plan assets:
Employer contributions	(0.1)	(0.1)
Benefits paid	(0.1)	(0.1)
Funded status at end of year				23.8	20.6
Amounts recognized in statement of financial position
Current liabilities					(0.1)
Non-current liabilities				(23.8)	(20.5)
Total				(23.8)	(20.6)
Amounts recognized in accumulated other comprehensive income
Net loss (gain)				4.6	1.5
Total, net of tax	1.5	(4.4)	(4.4)	4.6	1.5
Net loss (gain), income taxes				(1.9)	$ (0.7)
Reconciliation of accumulated other comprehensive income:
Accumulated other comprehensive income at beginning of plan year	1.5	(4.4)
Net loss/(gain) amortized during the year		0.1
Net loss/(gain) occurring during the year	3.2	6.0
Currency exchange rate adjustment	(0.1)	(0.2)
Net adjustment to accumulated other comprehensive income	3.1	5.9
Accumulated other comprehensive income at end of plan year	4.6	1.5	$ (4.4)
Net adjustment to accumulated other comprehensive income, income taxes	(1.2)	(2.6)
Amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of income tax
Net loss / (gain)	3.2	5.9
Amortization of net (loss) gain		0.2
Total amortization expenses	$ 3.2	$ 6.1
Expected Benefit Payments
2021				1.5
2022				1.6
2023				1.5
2024				1.5
2025				1.6
2026 to 2030				8.6
Total				$ 16.3
Post-retirement Health care plans | Expatriate Plan
Assumptions used to determine the pension obligation and other post-retirement benefits and cost
Discount rate (as a percent)	1.90%	2.85%	3.90%
Expected Benefit Payments
Assumed trend rate for covered health care benefit cost (as a percent)	5.10%
Assumed trend rate for covered health care benefit cost post-65 years of age (as a percent)	4.90%
Assumed ultimate trend rate for health care benefit cost (as a percent)				4.20%
Assumed ultimate trend rate for health care benefit cost post-65 years of age (as a percent)	4.00%
Post-retirement Health care plans | Mexican Health Plan
Expected Benefit Payments
Assumed trend rate for covered health care benefit cost (as a percent)		4.50%
Effect of one percentage-point change in assumed other benefit cost trend rates
Effect of one percentage-point increase on total service and interest cost components	$ 1.9
Effect of one percentage-point decrease on total service and interest cost components	1.5
Effect of one percentage-point increase on post-retirement benefit obligation	24.7
Effect of one percentage-point decrease on post-retirement benefit obligation	$ 22.2
Post-retirement Health care plans | Weighted average | Mexican Health Plan
Assumptions used to determine the pension obligation and other post-retirement benefits and cost
Discount rate (as a percent)	7.43%	7.15%	8.45%

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BENEFIT PLANS: - Post retirement (Details) - Post retirement defined benefit plans and defined contribution plan - Mexican Health Plan $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) entity	Dec. 31, 2019
Assumptions used to determine the pension obligation and other post-retirement benefits and cost
Number of financial institutions managing plan assets | entity	3
Plan obligations as a percentage of benefit obligation	100.00%
Asset allocation (as a percent)	100.00%	100.00%
Expected employer contribution in next fiscal year | $	$ 2.3
Parent Company (Grupo Mexico) common shares
Assumptions used to determine the pension obligation and other post-retirement benefits and cost
Asset allocation (as a percent)	22.00%
Treasury bills
Assumptions used to determine the pension obligation and other post-retirement benefits and cost
Asset allocation (as a percent)	78.00%	80.00%
Equity securities
Assumptions used to determine the pension obligation and other post-retirement benefits and cost
Asset allocation (as a percent)	22.00%	20.00%

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COMMITMENTS AND CONTINGENCIES: - Environmental matters (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2011 person category
Environmental costs
Environmental capital investment	$ 37.8	$ 82.9	$ 102.8
Peru
Environmental costs
Environmental capital investment		18.6	59.3
Environmental capital investment	(3.3)
Mexico
Environmental costs
Environmental capital investment	$ 41.1	$ 64.3	$ 43.5
Number of categories of collective actions | category				3
Minimum number of people claiming injury due to collective action initiative in Civil Federal Procedures Code (CFPC) | person				30

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COMMITMENTS AND CONTINGENCIES: - Guaymas sulfuric acid spill (Details) - Marine Terminal in Guaymas	Jul. 19, 2019 item	Jul. 09, 2019 m³
Volume of sulfuric acid discharged in the incident at Guaymas		3
Water volume at Guaymas bay		340,000,000
Number of times of renewal | item	4
Number of years of each renewal	2 years

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COMMITMENTS AND CONTINGENCIES: - Litigation matters (Details)	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2016 lawsuit	Jun. 30, 2015 lawsuit item	Dec. 31, 2020 claim item lawsuit	Dec. 31, 2015 item lawsuit	Dec. 31, 2019 item	Dec. 31, 2018 lawsuit
Litigation Matter
Number of collective action lawsuits		6
Number of subsidiaries against which lawsuits were filed | item		2
Number of collective action lawsuits dismissed		2
Number of lawsuits in process			4
Number of civil actions seeking damages						33
Number Of Constitutional Action Lawsuits				4
Number of subsidiaries to which environmental impact authorizations were granted | item				1
Tia Maria
Litigation Matter
Number of lawsuits			5
Buenavista del Cobre, S.A. de C.V
Litigation Matter
Number of civil actions seeking damages				8	3	3
Number of resolutions | claim			45
Francisca Garcia Enriquez
Litigation Matter
Number of additional constitutional lawsuits filed				2
Mario Alberto Salcido et al; Maria Elena Heredia Bustamante et al; Martin Eligio Ortiz Gamez et al and Maria de los Angeles Enriquez Bacame et al
Litigation Matter
Number of additional constitutional lawsuits filed	4
Mario Alberto Salcido et al; Maria Elena Heredia Bustamante et al; Martin Eligio Ortiz Gamez et al and Maria de los Angeles Enriquez Bacame et al | Mexico
Litigation Matter
Number of monitoring wells downstream from the dam | item			3
Period to submit Semarnat			2 years
Norberto Bustamante et al
Litigation Matter
Number of additional constitutional lawsuits filed			2
Acciones Colectivas de Sinaloa
Litigation Matter
Number of lawsuits in process			3

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COMMITMENTS AND CONTINGENCIES: - Labor matters (Details)	1 Months Ended										12 Months Ended
	Nov. 30, 2019 PEN (S/)	Nov. 30, 2019 USD ($)	May 31, 2019 PEN (S/)	May 31, 2019 USD ($)	Mar. 31, 2019 PEN (S/) item	Mar. 31, 2019 USD ($) item	Aug. 31, 2018 PEN (S/) item	Aug. 31, 2018 USD ($) item	Jun. 30, 2018 PEN (S/)	Jun. 30, 2018 USD ($)	Dec. 31, 2020 USD ($) item employee	Aug. 22, 2018 USD ($)
Labor Matters
Labor matters
Annual salary increase (as a percent)	5.00%	5.00%	5.50%	5.50%
Labor Matters | Year One Collective Bargaining Agreement
Labor matters
Term of agreement			1 year	1 year
Labor expense		$ 13,300	S/ 16,000	$ 4,800
Labor Matters | Year Three Collective Bargaining Agreement
Labor matters
Term of agreement	3 years	3 years
Labor expense | S/	S/ 45,000
Peru | Labor Matters
Labor matters
Percentage of labor unionized											66.00%
Total number of workers | employee											4,739
Number of labor unions											6
Number of labor unions represent majority of workers											1
Number of labor unions other than majority workers unions											5
Term of agreement							3 years	3 years	3 years	3 years
Annual salary increase (as a percent)					5.00%	5.00%	5.00%	5.00%	5.00%	5.00%
Labor expense					S/ 45,000	$ 13,600	S/ 45,000	$ 13,600	S/ 45,000	$ 13,600
Number of additional unions					1	1	3	3
Mexico | San Martin
Labor matters
Budgeted cost for rehabilitation of mine | $												$ 97,700,000
Total expense incurred on rehabilitation of mine till date | $											$ 86,400,000

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COMMITMENTS AND CONTINGENCIES: - Other (Details) S/ in Millions, $ in Millions			1 Months Ended				12 Months Ended
	Feb. 20, 2020 MW	Jul. 15, 2019 complaint	Jun. 30, 2018 USD ($) T	May 31, 2016 MW	Jul. 31, 2014 MW	Jun. 30, 2014 MW	Dec. 31, 2020 USD ($) item T	Dec. 31, 2020 PEN (S/) item T
Other commitments
Commitment for capital projects | $							$ 365.8
Tia Maria | Peru
Other commitments
Project budget | $							1,400.0
Amount spend as of the current date | $							$ 338.8
Annual production ( in tons) | T							120,000	120,000
Number Of Complaints | complaint		3
Number of jobs expected to be generated | item							9,000	9,000
Number of direct jobs expected to be generated | item							3,600	3,600
Number of indirect jobs expected to be generated | item							5,400	5,400
Number of workers expected to be directly employed | item							600	600
Number of workers expected to be indirectly employed | item							4,200	4,200
Toquepala Concentrator Expansion | Peru
Other commitments
Amount committed to funding for social and infrastructure improvement projects							$ 122.8	S/ 445.0
Commitment liability recorded in the balance sheet | $							41.3
Development Fund Moquegua Region | Peru
Other commitments
Amount committed to funding for social and infrastructure improvement projects							275.9	1,000.0
Copper | Michiquillay | Peru
Other commitments
Annual production ( in tons) | T			225,000
Contingent contractual obligation | $			$ 400.0
Estimated mineralized material (in tons) | T			1,150,000,000
Copper grade percentage			0.63%
Initial mine life			25 years
Contractual obligation paid on project | $			$ 12.5
Remaining amount to pay if project is developed | $			$ 387.5
Power purchase agreements | Electroperu S.A | Peru
Other commitments
Purchase agreement, contracted power capacity (in megawatts) | MW						120
Term of power purchase agreement related to sale of power plant						20 years
Power purchase agreements | Kallpa | Peru
Other commitments
Purchase agreement, contracted power capacity (in megawatts) | MW					120
Term of power purchase agreement related to sale of power plant				10 years	10 years
Power purchase agreements | Kallpa | Peru | Maximum
Other commitments
Purchase agreement, contracted power capacity (in megawatts) | MW				80
Power purchase agreements | Parque Eolico de Fenicias, S. de R.L. de C.V | Mexico
Other commitments
Purchase agreement, contracted power capacity (in megawatts) | MW	611,400
Term of power purchase agreement related to sale of power plant	20 years
Educational Project | Development Fund Moquegua Region | Peru
Other commitments
Amount committed to funding for social and infrastructure improvement projects							29.9	108.4
Water Treatment | Development Fund Moquegua Region | Peru
Other commitments
Amount committed to funding for social and infrastructure improvement projects							21.5	78.0
Social Investment For Taxes | Development Fund Moquegua Region | Peru
Other commitments
Amount committed to funding for social and infrastructure improvement projects							$ 24.0	S/ 86.9
Number of infrastructure projects agreed for construction | item							2	2
Social Investment For Taxes | Tacna region [Member] | Peru
Other commitments
Amount committed to funding for social and infrastructure improvement projects							$ 19.2	S/ 69.7
Number of infrastructure projects agreed for construction | item							1	1

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STOCKHOLDERS' EQUITY - Treasury Stock (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Activity in treasury stock
Balance at the beginning of the period	$ 3,048.9
Purchase of shares	2,900.0
Balance at the end of the period	$ 3,063.5	$ 3,048.9
Southern Copper common shares
Activity in treasury stock
Treasury stock balance at the end of the period (in shares)	111,522,817	111,537,217
TREASURY STOCK: | Southern Copper common shares
Activity in treasury stock
Balance at the beginning of the period	$ 2,767.9	$ 2,768.3
Used for corporate purposes	(0.4)	(0.4)	$ (0.4)
Balance at the end of the period	2,767.5	2,767.9	2,768.3
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares
Activity in treasury stock
Balance at the beginning of the period	281.0	251.3
Other activity, including dividend, interest and foreign currency transaction effect	15.0	29.7	18.9
Balance at the end of the period	$ 296.0	$ 281.0	$ 251.3

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STOCKHOLDERS' EQUITY - Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2008
SCC share repurchase program:
Amount authorized for share repurchase program	$ 3,000	$ 500
Total Number of Shares Purchased	119.5
Cost of purchase of shares	$ 2,900
Closing price of NYSE (in dollars per share)	$ 65.12
Maximum Number of Shares that May Yet Be Purchased Under the Plan @ $39.68	1.3
Percentage of Ownership by Parent	88.90%

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STOCKHOLDERS' EQUITY: - Directors' Stock Award Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Parent Company (Grupo Mexico) common shares
Activity in directors' stock award plan
Treasury stock balance at the end of the period (in shares)	87,598,097	93,082,532
Directors' Stock Award Plan
Share based Compensation Plan
Common shares received on election as director	1,200
Additional shares issued at each annual general meeting	1,200
Total SCC shares reserved for the plan	600,000	600,000
Period of extension of plan	5 years
Increased share awards issued to directors	1,600
Activity in directors' stock award plan
Total shares granted at the beginning of the period (in shares)	(377,200)	(362,800)
Granted in the period	(14,400)	(14,400)
Total shares granted at the end of the period (in shares)	(391,600)	(377,200)
Remaining shares reserved	208,400	222,800
Share based compensation
Stock based compensation expense	$ 0.4	$ 0.4

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STOCKHOLDERS' EQUITY - Compensation Plan (Details) $ / shares in Units, $ in Millions		1 Months Ended				12 Months Ended
	Feb. 21, 2019 USD ($) $ / shares	Nov. 30, 2018 $ / shares	Nov. 30, 2018 $ / shares	Jan. 31, 2015 $ / shares	Jan. 31, 2015 $ / shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Grupo Mexico and Americas Mining
Retained earnings
Dividend per share | $ / shares	$ 0.44428
Settlement dividend paid | $	$ 36.5
Legal fees paid | $	$ 13.5
Peruvian Operations
Non-controlling interest
Investment shareholders' interest in Peruvian Branch (as a percent)						0.71%
Employee Stock Purchase 2015 Plan
Information related to compensation cost
Purchase price for initial subscription (in dollars per share) | (per share)				$ 1.86	$ 38.44	$ 1.86
Percentage of title acquired by employee in every two years on shares paid in previous two years						50.00%
Period of plan						8 years
Ratio of bonus shares granted to participant						0.1
Stock based compensation expense | $						$ 0.6	$ 0.6	$ 0.6
Unrecognized compensation expense | $						$ 1.4	$ 2.0	$ 2.6
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares						1,379,734	1,840,336
Exercised (in shares) | shares						(115,324)	(460,602)
Outstanding shares at the end of the period | shares						1,264,410	1,379,734	1,840,336
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares						$ 2.63	$ 2.63
Exercised (in dollars per share) | $ / shares						2.63	2.63
Outstanding shares at the end of the period (in dollars per share) | $ / shares						$ 2.63	$ 2.63	$ 2.63
Employee Stock Purchase 2018 Plan
Information related to compensation cost
Purchase price for initial subscription (in dollars per share) | (per share)		$ 1.86	$ 37.89
Percentage of title acquired by employee in every two years on shares paid in previous two years						50.00%
Period of plan						8 years
Ratio of bonus shares granted to participant						0.1
Stock based compensation expense | $						$ 0.7	$ 0.7
Unrecognized compensation expense | $						$ 3.8	$ 4.5
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares						4,002,898	2,782,424
Granted (in shares) | shares							1,238,169
Exercised (in shares) | shares						(84,440)	(17,695)
Outstanding shares at the end of the period | shares						3,918,458	4,002,898	2,782,424
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares						$ 1.86	$ 1.86
Granted (in dollars per share) | $ / shares							1.86
Exercised (in dollars per share) | $ / shares						1.86	1.86
Outstanding shares at the end of the period (in dollars per share) | $ / shares						$ 1.86	$ 1.86	$ 1.86
Directors' Stock Award Plan
Information related to compensation cost
Stock based compensation expense | $						$ 0.4	$ 0.4
Stock award activity, Shares
Granted (in shares) | shares						14,400	14,400

XML

FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Liabilities:
Long-term debt, Carrying Value	$ 6,544.2	$ 6,940.8
Long-term debt, Fair Value	9,077.8	8,451.4
Short-term investment:
Trading securities	410.2	80.0
Available-for-sale:
Available-for-sale debt securities	0.6	0.7
Available-for-sale Securities, Current, Total	0.6	0.7
Quoted prices in active markets for identical assets (Level 1)
Liabilities:
Long-term debt, Carrying Value	6,193.6	6,190.6
Long-term debt, Fair Value	8,692.1	7,675.3
Significant other observable inputs (Level 2)
Liabilities:
Long-term debt, Carrying Value	350.6	750.2
Long-term debt, Fair Value	385.7	776.1
Fair value measurements recurring | Fair value as of the end of the period
Short-term investment:
Trading securities	410.2	80.0
Derivative:
Total assets, fair value	1,031.9	534.0
Fair value measurements recurring | Fair value as of the end of the period | Copper
Derivative:
Provisionally priced sales	491.9	326.5
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum
Derivative:
Provisionally priced sales	129.2	126.8
Fair value measurements recurring | Asset backed securities | Fair value as of the end of the period
Available-for-sale:
Available-for-sale debt securities	0.3	0.4
Fair value measurements recurring | Mortgage backed securities | Fair value as of the end of the period
Available-for-sale:
Available-for-sale debt securities	0.3	0.3
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1)
Short-term investment:
Trading securities	410.2	80.0
Derivative:
Total assets, fair value	1,031.3	533.3
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper
Derivative:
Provisionally priced sales	491.9	326.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum
Derivative:
Provisionally priced sales	129.2	126.8
Fair value measurements recurring | Significant other observable inputs (Level 2)
Available-for-sale:
Available-for-sale Securities, Current, Total	0.6	0.7
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities
Available-for-sale:
Available-for-sale debt securities	0.3	0.4
Fair value measurements recurring | Significant other observable inputs (Level 2) | Mortgage backed securities
Available-for-sale:
Available-for-sale debt securities	$ 0.3	$ 0.3

XML

CONCENTRATION OF RISK: (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) item	Dec. 31, 2019	Dec. 31, 2018
Concentration of risk
Number of open-pit copper mines | item	4
Number of underground poly metallic mines | item	5
Number of smelters | item	2
Number of refineries | item	10
Total cash and short-term investment	$ 2,594.4
Cash equivalents
Concentration of risk
Total cash and short-term investment	$ 2,594.4
Percentage of total cash	100.00%
Percentage of cash in US dollars	97.00%
Cash equivalents | United States
Concentration of risk
Total cash and short-term investment	$ 1,968.8
Percentage of total cash	75.90%
Percentage invested in one institution of country	14.10%
Percentage invested in one institution of total cash	10.70%
Cash equivalents | Switzerland
Concentration of risk
Total cash and short-term investment	$ 340.3
Percentage of total cash	13.10%
Percentage invested in one institution of country	79.40%
Percentage invested in one institution of total cash	10.40%
Cash equivalents | Peru
Concentration of risk
Total cash and short-term investment	$ 35.5
Percentage of total cash	1.40%
Percentage invested in one institution of country	81.40%
Percentage invested in one institution of total cash	1.10%
Cash equivalents | Mexico
Concentration of risk
Total cash and short-term investment	$ 249.8
Percentage of total cash	9.60%
Percentage invested in one institution of country	53.80%
Percentage invested in one institution of total cash	5.20%
Accounts receivable trade | Five largest customers
Concentration of risk
Percentage of accounts receivable and total sales	35.30%	37.60%	34.20%
Accounts receivable trade | Largest customer
Concentration of risk
Percentage of accounts receivable and total sales	12.90%	13.00%	10.90%
Total sales | Five largest customers
Concentration of risk
Percentage of accounts receivable and total sales	28.10%	28.00%	28.40%
Total sales | Largest customer
Concentration of risk
Percentage of accounts receivable and total sales	10.00%	10.40%	9.30%

XML

RELATED PARTY TRANSACTIONS: (Details) $ in Millions	1 Months Ended		12 Months Ended
	May 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2014 item
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			$ 23.3	$ 30.0	$ 101.5
Related parties receivable non-current:				59.5
Related parties payable:			104.3	86.4
Total purchases			4.1	2.9	12.9
Total sales			1.9	2.2	1.5
Minimum
RELATED PARTY TRANSACTIONS:
Aggregate consideration of Material Affiliate Transaction to be be authorized by the General Counsel and CFO			8.0
Maximum
RELATED PARTY TRANSACTIONS:
Aggregate consideration of Material Affiliate Transaction to be be authorized by the General Counsel and CFO			10.0
Grupo Mexico and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases			576.3	385.6	380.5
Total sales			132.9	58.9	150.3
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			5.3	10.8
Related parties receivable non-current:				59.5
Related parties payable:			13.9	4.3
Total purchases			233.9	37.6	37.2
Total sales			77.9	11.3	81.8
Accounts Receivable		$ 62.0
Making quarterly payments		$ 0.5
Asarco LLC | Other Noncurrent Assets [Member]
RELATED PARTY TRANSACTIONS:
Related parties receivable non-current:			2.2	2.3
Asarco LLC | London Interbank Offered Rate (LIBOR) [Member]
RELATED PARTY TRANSACTIONS:
Debt Instrument, Basis Spread on Variable Rate		2.00%
AMMINCO
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.1
Related parties payable:			19.6	16.9
Total purchases			18.6	17.8	8.0
Total sales			0.1	0.1	0.3
Compania Perforadora Mexico, S.A.P.I. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.3	0.3
Total sales				0.1
Eolica El Retiro, S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			0.3
Total purchases			$ 1.0	$ 2.9	3.6
Number of wind turbines | item							37
Percentage of supply to third-party energy users			9.60%	18.20%
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			$ 4.7	$ 6.4
Total purchases			45.8	44.1	41.7
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			2.7	2.7
Related parties payable:			0.9	1.1
Total purchases			10.0	10.0	10.1
Donations			7.1	9.6
Mexico Generadora de Energia, S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			14.4	15.3
Related parties payable:			40.8	40.2
Total purchases			213.3	202.2	200.1
Total sales			$ 54.9	$ 47.4	68.2
Accounts Receivable	$ 97.2
Making quarterly payments	$ 5.1
Debt Instrument, Basis Spread on Variable Rate	8.28%
Mexico Generadora de Energia, S. de R.L. ("MGE") | Mexico
RELATED PARTY TRANSACTIONS:
Number of natural gas-fired combined cycle power generating units | item						2
Net total capacity (in megawatts) | MW						516.2
Percentage of supply to third-party energy users			2.30%	5.20%
Mexico Compania Constructora S.A de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			$ 22.9	$ 16.0
Total purchases			42.6	60.3	72.9
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates ("MPD")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.2	0.2
Related parties payable:			0.7
Total purchases			$ 11.1	10.7	6.9
Apu Coropuna S.R.L.
RELATED PARTY TRANSACTIONS:
Ownership percentage			30.00%
Related to the controlling group
RELATED PARTY TRANSACTIONS:
Total purchases			$ 0.2	0.2	0.2
Boutique Bowling de Mexico, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.2	0.1
Related parties payable:			0.3	0.2
Total purchases			0.4	0.4	0.3
Total sales			0.1	0.1	0.2
Empresarios Industriales de Mexico, S.A. de C.V
RELATED PARTY TRANSACTIONS:
Total sales				0.2
Mexico Transportes Aereos, S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:				0.4
Related parties payable:			0.1	1.2
Total sales			1.7	1.8	1.2
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.2	0.1
Related parties payable:			0.1	0.1
Total purchases			3.5	2.3	12.4
Total sales			$ 0.1	$ 0.1	$ 0.1
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage			44.20%

XML

SEGMENT AND RELATED INFORMATION: - Financial (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) item country segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Financial information related to segments
Number of reportable segments | segment	3
Number of countries having open-pit operations | country	2
Financial information relating to segments
Net sales (including sales to related parties, see note 17)	$ 7,984,900	$ 7,285,600	$ 7,096,700
Cost of sales (exclusive of depreciation, amortization and depletion)	3,929,800	3,606,400	3,409,000
Selling, general and administrative	126,200	131,800	102,600
Depreciation, amortization and depletion	775,600	764,400	674,300
Exploration	32,600	30,000	29,600
Operating income	3,120,700	2,753,000	2,881,200
Interest, net	(347,400)	(319,500)	(261,100)
Other income (expense)	(27,500)	(7,000)	(30,700)
Income taxes	(1,174,400)	(945,300)	(1,053,500)
Equity earnings of affiliate, net of income tax	6,400	10,700	12,300
Non-controlling interest	(7,400)	(6,100)	(5,200)
Net income attributable to SCC	1,570,400	1,485,800	1,543,000
Capital investment	592,200	707,500	1,121,400
Property and mine development, net	9,458,700	9,371,000	9,403,800
Total assets	16,946,500	16,407,400	14,287,600
Intersegment sales
Financial information relating to segments
Net sales (including sales to related parties, see note 17)	(111,000)	(83,200)	(79,300)
Corporate, other and eliminations
Financial information relating to segments
Net sales (including sales to related parties, see note 17)	(111,000)	(83,200)	(79,300)
Cost of sales (exclusive of depreciation, amortization and depletion)	(124,300)	(89,100)	(88,600)
Selling, general and administrative	8,600	6,800	2,100
Depreciation, amortization and depletion	37,700	32,100	28,900
Exploration	12,100	2,700	3,800
Operating income	(45,100)	(35,700)	(25,500)
Capital investment	8,000	6,800	20,600
Property and mine development, net	704,900	346,200	374,500
Total assets	$ 3,573,300	2,470,000	379,100
Mexican Open-pit
Financial information related to segments
Number of open-pit copper mines | item	2
Financial information relating to segments
Net sales (including sales to related parties, see note 17)	$ 4,412,400	3,963,900	4,075,900
Mexican Open-pit | Operating segment
Financial information relating to segments
Net sales (including sales to related parties, see note 17)	4,412,400	3,963,900	4,075,900
Cost of sales (exclusive of depreciation, amortization and depletion)	1,991,600	1,613,100	1,611,000
Selling, general and administrative	70,500	78,600	55,300
Depreciation, amortization and depletion	366,700	351,900	360,400
Exploration	2,500	1,800	2,000
Operating income	1,981,100	1,918,500	2,047,200
Capital investment	317,100	244,300	266,800
Property and mine development, net	4,470,500	4,648,500	4,783,800
Total assets	7,236,100	8,081,900	8,165,200
Mexican Open-pit | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales (including sales to related parties, see note 17)	$ 4,412,400	3,963,900	4,075,900
Mexican IMMSA Unit
Financial information related to segments
Number of underground poly metal mines | item	5
Financial information relating to segments
Net sales (including sales to related parties, see note 17)	$ 529,900	464,800	527,900
Mexican IMMSA Unit | Operating segment
Financial information relating to segments
Net sales (including sales to related parties, see note 17)	529,900	464,800	527,900
Cost of sales (exclusive of depreciation, amortization and depletion)	383,000	380,300	377,200
Selling, general and administrative	9,500	7,900	8,500
Depreciation, amortization and depletion	42,500	52,300	47,600
Exploration	8,600	9,000	5,300
Operating income	86,300	15,300	89,300
Capital investment	72,100	106,300	60,000
Property and mine development, net	548,200	497,100	448,300
Total assets	967,200	837,600	930,200
Mexican IMMSA Unit | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales (including sales to related parties, see note 17)	418,900	381,600	448,600
Mexican IMMSA Unit | Intersegment sales | Operating segment
Financial information relating to segments
Net sales (including sales to related parties, see note 17)	$ 111,000	83,200	79,300
Peruvian Operations
Financial information related to segments
Number of open-pit copper mines | item	2
Financial information relating to segments
Net sales (including sales to related parties, see note 17)	$ 3,153,600	2,940,100	2,572,200
Peruvian Operations | Operating segment
Financial information relating to segments
Net sales (including sales to related parties, see note 17)	3,153,600	2,940,100	2,572,200
Cost of sales (exclusive of depreciation, amortization and depletion)	1,679,500	1,702,100	1,509,400
Selling, general and administrative	37,600	38,500	36,700
Depreciation, amortization and depletion	328,700	328,100	237,400
Exploration	9,400	16,500	18,500
Operating income	1,098,400	854,900	770,200
Capital investment	195,000	350,100	774,000
Property and mine development, net	3,735,100	3,879,200	3,797,200
Total assets	5,169,900	5,017,900	4,813,100
Peruvian Operations | Reportable subsegments | Operating segment
Financial information relating to segments
Net sales (including sales to related parties, see note 17)	$ 3,153,600	$ 2,940,100	$ 2,572,200

XML

SEGMENT AND RELATED INFORMATION: - Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financial information related to segments
Trade receivables	$ 1,068.9	$ 832.9	$ 822.4
Related parties receivable current:	23.3	30.0	101.5
Related parties receivable non-current:		59.5
Corporate, other and eliminations
Financial information related to segments
Related parties receivable current:	7.1	7.9	19.9
Mexican Open-pit
Financial information related to segments
Trade receivables	566.0	477.8	505.9
Related parties receivable current:	15.4	22.1	81.6
Related parties receivable non-current:		59.5
Mexican IMMSA Unit
Financial information related to segments
Trade receivables	57.8	38.0	50.5
Peruvian Operations
Financial information related to segments
Trade receivables	445.1	$ 317.1	$ 266.0
Related parties receivable current:	$ 0.8

XML

SEGMENT AND RELATED INFORMATION: - Sales (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	$ 7,984.9	$ 7,285.6	$ 7,096.7
Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	6,513.1	5,845.3	5,707.8
Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	510.3	549.4	509.9
Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	249.4	277.8	328.6
Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	447.8	324.3	300.2
Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	264.3	288.8	250.2
Corporate, other and eliminations
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	(111.0)	(83.2)	(79.3)
Corporate, other and eliminations | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	(48.4)	(46.9)	(48.1)
Corporate, other and eliminations | Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	1.6	(2.3)	(0.1)
Corporate, other and eliminations | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	(55.5)	(29.9)	(28.1)
Corporate, other and eliminations | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	(8.7)	(4.1)	(3.0)
Mexican Open-pit
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	4,412.4	3,963.9	4,075.9
Mexican Open-pit | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	4,412.4	3,963.9	4,075.9
Mexican Open-pit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	3,762.1	3,314.9	3,459.1
Mexican Open-pit | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	275.2	341.0	342.5
Mexican Open-pit | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	235.5	185.9	175.3
Mexican Open-pit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	139.6	122.1	99.0
Mexican IMMSA Unit
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	529.9	464.8	527.9
Mexican IMMSA Unit | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	529.9	464.8	527.9
Mexican IMMSA Unit | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	72.1	42.0	45.6
Mexican IMMSA Unit | Operating segment | Silver
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	247.8	280.1	328.7
Mexican IMMSA Unit | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	155.8	82.7	83.5
Mexican IMMSA Unit | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	54.2	60.0	70.1
Peruvian Operations
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	3,153.6	2,940.1	2,572.2
Peruvian Operations | Operating segment
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	3,153.6	2,940.1	2,572.2
Peruvian Operations | Operating segment | Copper
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	2,727.3	2,535.3	2,251.2
Peruvian Operations | Operating segment | Molybdenum
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	235.1	208.4	167.4
Peruvian Operations | Operating segment | Zinc
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	112.0	85.6	69.5
Peruvian Operations | Operating segment | Other
SALES VALUE PER SEGMENT:
Net sales (including sales to related parties, see note 17)	$ 79.2	$ 110.8	$ 84.1

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SEGMENT AND RELATED INFORMATION: - Geographical (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of revenue by geographical location
Net sales	$ 7,984.9	$ 7,285.6	$ 7,096.7
Mexico
Schedule of revenue by geographical location
Net sales	1,526.7	1,531.9	1,649.3
United States
Schedule of revenue by geographical location
Net sales	1,363.4	1,195.6	1,258.6
Peru
Schedule of revenue by geographical location
Net sales	335.0	340.0	390.4
Brazil
Schedule of revenue by geographical location
Net sales	233.0	211.7	271.9
Chile
Schedule of revenue by geographical location
Net sales	221.1	191.3	136.3
Other American countries
Schedule of revenue by geographical location
Net sales	42.4	43.1	65.8
Switzerland
Schedule of revenue by geographical location
Net sales	1,443.3	1,173.4	653.4
Italy
Schedule of revenue by geographical location
Net sales	271.6	297.0	347.3
Spain
Schedule of revenue by geographical location
Net sales	199.4	186.1	169.4
Other European Countries
Schedule of revenue by geographical location
Net sales	521.7	374.6	379.6
Singapore
Schedule of revenue by geographical location
Net sales	863.7	966.9	1,069.2
Japan
Schedule of revenue by geographical location
Net sales	579.5	500.8	483.4
Other Asian countries
Schedule of revenue by geographical location
Net sales	384.1	273.2	222.1
Corporate, other and eliminations
Schedule of revenue by geographical location
Net sales	(111.0)	(83.2)	(79.3)
Corporate, other and eliminations | Mexico
Schedule of revenue by geographical location
Net sales	(111.0)	(83.2)	(79.3)
Mexican Open-pit
Schedule of revenue by geographical location
Net sales	4,412.4	3,963.9	4,075.9
Mexican Open-pit | Mexico
Schedule of revenue by geographical location
Net sales	1,296.6	1,262.2	1,343.0
Mexican Open-pit | United States
Schedule of revenue by geographical location
Net sales	1,182.8	1,054.9	1,008.0
Mexican Open-pit | Peru
Schedule of revenue by geographical location
Net sales		1.6
Mexican Open-pit | Chile
Schedule of revenue by geographical location
Net sales	18.8	1.2
Mexican Open-pit | Other American countries
Schedule of revenue by geographical location
Net sales	36.8	37.6	60.6
Mexican Open-pit | Switzerland
Schedule of revenue by geographical location
Net sales	898.2	780.9	453.3
Mexican Open-pit | Italy
Schedule of revenue by geographical location
Net sales	0.1	45.1	20.6
Mexican Open-pit | Spain
Schedule of revenue by geographical location
Net sales	199.4	186.1	169.4
Mexican Open-pit | Other European Countries
Schedule of revenue by geographical location
Net sales	199.9	92.8	234.8
Mexican Open-pit | Singapore
Schedule of revenue by geographical location
Net sales	319.9	345.4	528.8
Mexican Open-pit | Japan
Schedule of revenue by geographical location
Net sales	46.9	59.9	71.8
Mexican Open-pit | Other Asian countries
Schedule of revenue by geographical location
Net sales	213.0	96.2	185.6
Mexican IMMSA Unit
Schedule of revenue by geographical location
Net sales	529.9	464.8	527.9
Mexican IMMSA Unit | Mexico
Schedule of revenue by geographical location
Net sales	341.1	352.9	385.6
Mexican IMMSA Unit | United States
Schedule of revenue by geographical location
Net sales	27.2	6.2	6.6
Mexican IMMSA Unit | Peru
Schedule of revenue by geographical location
Net sales	13.0
Mexican IMMSA Unit | Brazil
Schedule of revenue by geographical location
Net sales	18.7	17.3	43.8
Mexican IMMSA Unit | Other American countries
Schedule of revenue by geographical location
Net sales	2.9	2.2	3.8
Mexican IMMSA Unit | Switzerland
Schedule of revenue by geographical location
Net sales	69.9	36.7	43.4
Mexican IMMSA Unit | Italy
Schedule of revenue by geographical location
Net sales	9.5	13.3	21.7
Mexican IMMSA Unit | Other European Countries
Schedule of revenue by geographical location
Net sales	40.2	24.9	19.9
Mexican IMMSA Unit | Singapore
Schedule of revenue by geographical location
Net sales	6.9	10.4	2.2
Mexican IMMSA Unit | Other Asian countries
Schedule of revenue by geographical location
Net sales	0.5	0.9	0.9
Peruvian Operations
Schedule of revenue by geographical location
Net sales	3,153.6	2,940.1	2,572.2
Peruvian Operations | United States
Schedule of revenue by geographical location
Net sales	153.4	134.5	244.0
Peruvian Operations | Peru
Schedule of revenue by geographical location
Net sales	322.0	338.4	390.4
Peruvian Operations | Brazil
Schedule of revenue by geographical location
Net sales	214.3	194.4	228.1
Peruvian Operations | Chile
Schedule of revenue by geographical location
Net sales	202.3	190.1	136.3
Peruvian Operations | Other American countries
Schedule of revenue by geographical location
Net sales	2.7	3.3	1.4
Peruvian Operations | Switzerland
Schedule of revenue by geographical location
Net sales	475.2	355.8	156.7
Peruvian Operations | Italy
Schedule of revenue by geographical location
Net sales	262.0	238.6	305.0
Peruvian Operations | Other European Countries
Schedule of revenue by geographical location
Net sales	281.6	256.9	124.9
Peruvian Operations | Singapore
Schedule of revenue by geographical location
Net sales	536.9	611.1	538.2
Peruvian Operations | Japan
Schedule of revenue by geographical location
Net sales	532.6	440.9	411.6
Peruvian Operations | Other Asian countries
Schedule of revenue by geographical location
Net sales	$ 170.6	$ 176.1	$ 35.6

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SEGMENT AND RELATED INFORMATION: - Provisional Sale (Details) lb in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) lb	Dec. 31, 2019 USD ($)
Provisionally priced sales:
Provisional price sales adjustment amounts included in net sales	$ (31,500,000)	$ 4,200,000
Copper
Provisionally priced sales:
Provisional price sales adjustment amounts included in accounts receivable	$ (17,400,000)	(4,000,000.0)
Copper | January through April 2021
Provisionally priced sales:
Sales volume (in million lbs.) | lb	139.8
Provisional price	$ 3.52
Molybdenum
Provisionally priced sales:
Provisional price sales adjustment amounts included in accounts receivable	$ (14,100,000)	$ 8,200,000
Molybdenum | January through March 2021
Provisionally priced sales:
Sales volume (in million lbs.) | lb	12.9
Provisional price	$ 10.03

XML

SEGMENT AND RELATED INFORMATION: - Long Term Sales Contract (Details)	12 Months Ended
	Dec. 31, 2020 T
Copper cathodes | Mitsui
Long-term sales contract
Term of agreement	3 years
Quantity to be supplied related to additional annual contract from 2016 until 2019 (in tons)	48,000
Molybdenum concentrates | Molibdenos y Metales
Long-term sales contract
Minimum percentage of total production required to be supplied	70.00%
Molybdenum concentrates | Molymex
Long-term sales contract
Minimum percentage of total production required to be supplied	80.00%

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SUBSEQUENT EVENTS: (Details) - $ / shares	Feb. 24, 2021	Jan. 21, 2021	Feb. 21, 2019
Grupo Mexico and Americas Mining
SUBSEQUENT EVENTS
Dividends declared and paid			$ 0.44428
Subsequent Events
SUBSEQUENT EVENTS
Quarterly dividend authorized (in dollars per share)		$ 0.60
Dividends declared and paid	$ 0.60

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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable
Valuation and Qualifying Accounts and Reserves
Balance at beginning of period	$ 0.5	$ 0.5	$ 1.1
Charged to costs and expenses	8.5
Deductions/Applications	(0.2)		(0.6)
Balance at end of period	8.8	0.5	0.5
Notes issued under par
Valuation and Qualifying Accounts and Reserves
Balance at beginning of period	69.6	58.8	60.5
Charged to costs and expenses	2.0	1.9	1.7
Additions		12.7
Balance at end of period	67.6	69.6	58.8
Valuation allowance
Valuation and Qualifying Accounts and Reserves
Balance at beginning of period	1,097.0	819.1	619.6
Charged to costs and expenses	246.2	277.9	199.5
Balance at end of period	$ 1,343.2	$ 1,097.0	$ 819.1