10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

☒ 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 001-34018

GRAN TIERRA ENERGY INC.

(Exact name of registrant as specified in its charter)

Delaware				98-0479924
(State or other jurisdiction of incorporation or organization)				(I.R.S. Employer Identification No.)
900, 520 - 3 Avenue SW
	Calgary,	Alberta	Canada	T2P 0R3
(Address of principal executive offices, including zip code)

(403) 265-3221

(Registrant’s telephone number, including area code)

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.001 per share	GTE	NYSE American
		Toronto Stock Exchange
		London 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 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, or a smaller reporting company or an emerging growth company. See the 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.                  ☒

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

The aggregate market value of the voting and non-voting common equity held by non-affiliates as of June 30, 2020, the last business day of the registrant’s most recently completed second fiscal quarter, was approximately $96.8 million.

On February 19, 2021, 366,981,556 shares of the registrant’s Common Stock with $0.001 par value were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

The information required by Part III of this report, to the extent not set forth herein, is incorporated by reference from the registrant’s definitive proxy statement relating to the 2021 annual meeting of stockholders, which definitive proxy statement will be filed with the Securities and Exchange Commission within 120 days after December 31, 2020.

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Gran Tierra Energy Inc.

Annual Report on Form 10-K

Year Ended December 31, 2020

Table of Contents

		Page
PART I
Items 1 and 2.	Business and Properties	6
Item 1A.	Risk Factors	19
Item 1B.	Unresolved Staff Comments	27
Item 3.	Legal Proceedings	27
Item 4.	Mine Safety Disclosures	27
PART II
Item 5.	Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	29
Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	29
Item 8.	Financial Statements and Supplementary Data	55
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	86
Item 9A.	Controls and Procedures	86
Item 9B.	Other Information	88
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	88
Item 11.	Executive Compensation	88
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	88
Item 13.	Certain Relationships and Related Transactions, and Director Independence	89
Item 14.	Principal Accounting Fees and Services	89
PART IV
Item 15.	Exhibits, Financial Statement Schedules	90
Item 16.	Form 10-K Summary	96
SIGNATURES		97

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CAUTIONARY LANGUAGE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). All statements other than statements of historical facts included in this Annual Report on Form 10-K regarding our financial position, estimated quantities and net present values of reserves, business strategy, plans and objectives of our management for future operations, covenant compliance, capital spending plans and benefits of the changes in our capital program or expenditures, our liquidity and financial condition, the impacts of the novel coronavirus (COVID-19) pandemic and those statements preceded by, followed by or that otherwise include the words “believe”, “expect”, “anticipate”, “intend”, “estimate”, “project”, “target”, “goal”, “plan”, “budget”, “objective”, “should”, or similar expressions or variations on these expressions are forward-looking statements. We can give no assurances that the assumptions upon which the forward-looking statements are based will prove to be correct or that, even if correct, intervening circumstances will not occur to cause actual results to be different than expected. Because forward-looking statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by the forward-looking statements. There are a number of risks, uncertainties and other important factors that could cause our actual results to differ materially from the forward-looking statements, including, but not limited to, our ability to comply with covenants in our credit

agreement and indentures and make borrowings under our credit agreement; a reduction in our borrowing base and our ability to repay any excess borrowings; sustained or future declines in commodity prices and the demand for oil; continued or future excess supply of oil and natural gas; potential future impairments and reductions in proved reserve quantities and value; continued spread of the COVID-19 virus and extensions of previously announced lockdowns and possible future restrictions against oil and gas activity in Colombia and Ecuador; our operations are located in South America, and unexpected problems can arise due to guerilla activity and other local conditions; technical difficulties and operational difficulties may arise which impact the production, transport or sale of our products; geographic, political and weather conditions can impact the production, transport or sale of our products; our ability to raise capital; our ability to identify and complete successful acquisitions; our ability to execute business plans; unexpected delays and difficulties in developing currently owned properties may occur; the timely receipt of regulatory or other required approvals for our operating activities; the failure of exploratory drilling to result in commercial wells; unexpected delays due to the limited availability of drilling equipment and personnel; current global economic and credit market conditions may impact oil prices and oil consumption differently than we currently predict, which could cause us to further modify our strategy and capital spending program; volatility or declines in the trading price of our common stock and the continued listing of our shares on a national stock exchange; and those factors set out in Part I, Item 1A “Risk Factors” in this Annual Report on Form 10-K. The unprecedented nature of the current pandemic and downturn in the worldwide economy and oil and gas industry makes, including the unpredictable nature of the resurgence of cases and governmental responses, make it more difficult to predict the accuracy of the forward-looking statements. The information included herein is given as of the filing date of this Annual Report on Form 10-K with the Securities and Exchange Commission (“SEC”) and, except as otherwise required by the federal securities laws, we disclaim any obligation or undertaking to publicly release any updates or revisions to, or to withdraw, any forward-looking statement contained in this Annual Report on Form 10-K to reflect any change in our expectations with regard thereto or any change in events, conditions or circumstances on which any forward-looking statement is based.

GLOSSARY OF OIL AND GAS TERMS

In this report, the abbreviations set forth below have the following meanings:

bbl	barrel	Mcf	thousand cubic feet
Mbbl	thousand barrels	MMcf	million cubic feet
MMbbl	million barrels	Bcf	billion cubic feet
BOE	barrels of oil equivalent	bopd	barrels of oil per day
MMBOE	million barrels of oil equivalent	NAR	net after royalty
BOEPD	barrels of oil equivalent per day	BOPD	barrels of oil per day

Sales volumes represent production NAR adjusted for inventory changes and losses. Our oil and gas reserves are reported NAR. Our production is also reported NAR, except as otherwise specifically noted as “working interest production before royalties”. Gas volumes are converted to BOE at the rate of 6 Mcf of gas per bbl of oil, based upon the approximate relative energy content of gas and oil. The rate is not necessarily indicative of the relationship between oil and gas prices. BOEs may be misleading, particularly if used in isolation. A BOE conversion ratio of 6 Mcf:1 bbl is based on an energy equivalency conversion method primarily applicable at the burner tip and does not represent a value equivalency at the wellhead.

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Below are explanations of some commonly used terms in the oil and gas business and in this report.

Developed acres. The number of acres that are allocated or assignable to producing wells or wells capable of production.

Development well. A well drilled within the proved area of an oil or gas reservoir to the depth of a stratigraphic horizon known to be productive.

Dry hole. Exploratory or development well that does not produce oil or gas in commercial quantities.

Exploitation activities. The process of the recovery of fluids from reservoirs and drilling and development of oil and gas reserves.

Exploration well. An exploration well is a well drilled to find a new field or new reservoir in a field previously found to be productive of oil or gas in another reservoir. Generally, an exploratory well is any well that is not a development well, an extension well, a service well or a stratigraphic test well.

Field. An area consisting of a single reservoir or multiple reservoirs all grouped on or related to the same individual geological structural feature and/or stratigraphic condition.

Gross acres or gross wells. The total acres or wells in which we own a working interest.

Net acres or net wells. The sum of the fractional working interests we own in gross acres or gross wells expressed as whole numbers and fractions of whole numbers.

Possible reserves. Possible reserves are those additional reserves that are less certain to be recovered than probable reserves. The SEC provides a complete definition of possible reserves in Rule 4-10(a)(17) of Regulation S-X.

Probable reserves. Probable reserves are those additional reserves that are less certain to be recovered than proved reserves but that, together with proved reserves, are as likely as not to be recovered. The SEC provides a complete definition of probable reserves in Rule 4-10(a)(18) of Regulation S-X.

Productive well. A well that is found to be capable of producing hydrocarbons in sufficient quantities such that proceeds from the sale of such production exceed production expenses and taxes.

Proved developed reserves. In general, reserves that can be expected to be recovered from existing wells with existing equipment and operating methods. The SEC provides a complete definition of developed oil and gas reserves in Rule 4-10(a)(6) of Regulation S-X.

Proved reserves. Those quantities of oil and natural gas, which, by analysis of geoscience and engineering data, can be estimated with reasonable certainty to be economically producible from a given date forward, from known reservoirs and under existing economic conditions, operating methods and government regulations prior to the time at which contracts providing the right to operate expire, unless evidence indicates that renewal is reasonably certain, regardless of whether deterministic or probabilistic methods are used for the estimation. The project to extract the hydrocarbons must have commenced or the operator must be reasonably certain that it will commence the project within a reasonable time.

(i)The area of the reservoir considered as proved includes:

(A)The area identified by drilling and limited by fluid contacts, if any, and

(B)Adjacent undrilled portions of the reservoir that can, with reasonable certainty, be judged to be continuous with it and to contain economically producible oil or gas on the basis of available geoscience and engineering data.

(ii)In the absence of data on fluid contacts, proved quantities in a reservoir are limited by the lowest known hydrocarbons ("LKH") as seen in a well penetration unless geoscience, engineering, or performance data and reliable technology establishes a lower contact with reasonable certainty.

(iii)Where direct observation from well penetrations has defined a highest known oil ("HKO") elevation and the potential exists for an associated gas cap, proved oil reserves may be assigned in the structurally higher portions of the reservoir only if geoscience, engineering, or performance data and reliable technology establish the higher contact with reasonable certainty.

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(iv)Reserves which can be produced economically through application of improved recovery techniques (including, but not limited to, fluid injection) are included in the proved classification when:

(A)Successful testing by a pilot project in an area of the reservoir with properties no more favorable than in the reservoir as a whole, the operation of an installed program in the reservoir or an analogous reservoir, or other evidence using reliable technology establishes the reasonable certainty of the engineering analysis on which the project or program was based; and

(B)The project has been approved for development by all necessary parties and entities, including governmental entities.

(v)Existing economic conditions include prices and costs at which economic producibility from a reservoir is to be determined. The price shall be the average price during the 12-month period prior to the ending date of the period covered by the report, determined as an unweighted arithmetic average of the first-day-of-the-month price for each month within such period, unless prices are defined by contractual arrangements, excluding escalations based upon future conditions.

Proved undeveloped reserves. In general, reserves that are expected to be recovered from new wells on undrilled acreage or from existing wells where a relatively major expenditure is required for recompletion. The SEC provides a complete definition of undeveloped oil and gas reserves in Rule 4-10(a)(31) of Regulation S-X.

Reserves. Reserves are estimated remaining quantities of oil and gas and related substances anticipated to be economically producible, as of a given date, by application of development projects to known accumulations. In addition, there must exist, or there must be a reasonable expectation that there will exist, the legal right to produce or a revenue interest in the production, installed means of delivering oil and gas or related substances to market, and all permits and financing required to implement the project.

Undeveloped acreage. Lease acreage on which wells have not been drilled or completed to a point that would permit the production of economic quantities of oil and gas regardless of whether such acreage contains proved reserves.

Working interest. The operating interest that gives the owner the right to drill, produce and conduct operating activities on the property and a share of production and requires the owner to pay a share of the costs of drilling and production operations.

PART I

Items 1 and 2. Business and Properties

General

Gran Tierra Energy Inc., together with its subsidiaries (“Gran Tierra”, “the Company”, “us”, “our”, or “we”), is a company focused on international oil and gas exploration and production with assets currently in Colombia and Ecuador. Our Colombian properties represented 100% of our proved reserves NAR at December 31, 2020. For the year ended December 31, 2020, 100% (2019 - 100%) of our revenue and other income was generated in Colombia.

We were incorporated under the laws of the State of Nevada in June 2008 and changed our state of incorporation to the State of Delaware in October 2016.

All dollar ($) amounts referred to in this Annual Report on Form 10-K are United States (U.S.) dollars, unless otherwise indicated.

2020 Operational Highlights

During the year ended December 31, 2020, we incurred capital expenditures of $96.3 million, the majority of which were incurred in Colombia. In 2020, we drilled 7 development wells and one water injector, all of which were drilled in the Midas Block. As at December 31, 2020, 6 of the development wells were producing and one was in progress.

Of the three wells in progress in Colombia as at December 31, 2019, one was inactive pending future tests and two were dry at December 31, 2020.

The COVID-19 pandemic and resulting economic slowdown disrupted the overall global supply and demand for crude oil for the year ended December 31, 2020. Governments worldwide, including those in Canada, Colombia and Ecuador, the countries where we currently operate, enacted emergency measures to combat the spread of the virus, including the implementation of travel bans and self-imposed quarantines, which decreased the demand for and increased the supply of oil. On April 12, 2020,

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certain members of OPEC+ had agreed to production cuts intended to mitigate the oil supply and demand imbalance to stabilize prices. On December 3, 2020, certain members agreed to modestly increase production in January 2021; however, members eventually agreed to keep production levels mostly steady in February and March 2021 as certain economies have been forced to lockdown again due to a resurgence of the pandemic and the difficulties that governments have experienced in distributing vaccines. Though declining U.S. production has helped to mitigate the supply and demand imbalance experienced during 2020, we expect that oil supply and demand in the near term will continue to be influenced by the duration and severity of the COVID-19 pandemic and its resulting impact on global economies and the extent to which countries abide by the OPEC+ production agreement.

2021 Outlook

Our Colombian operation, which represents 100% of our production, is expected to represent 98% of our 2021 capital budget with the remainder allocated to exploration activities in Ecuador.

The table below shows the break-down of our 2021 capital program:

	Number of Wells (Gross)	Number of Wells (Net)	2021 Capital Budget ($ million)
Colombia
Development	14-18	14-18	118-138
Exploration	—	—	9
Ecuador
Exploration	—	—	3
	14-18	14-18	130-150

Our base capital program for 2021 is $130 million to $150 million for exploration and development based on a mid-point range for budgeted exploration costs. Based on the mid-point of the 2021 guidance, the capital budget is forecasted to be approximately 91% directed to development and 9% to exploration activities. Approximately 21% of the development activities included in the 2021 capital program are expected to be directed to facilities.

We expect our 2021 capital program to be fully funded by cash flows from operations. Funding this program from cash flow from operations relies in part on Brent oil prices being at least $49 per bbl for 2021.

Business Strategy

We are an international exploration and production company focused on hydrocarbon development in proven, under-explored conventional basins which have access to established infrastructure and competitive fiscal regimes. Our mandate is to develop high value resource opportunities in order to deliver top-quartile returns. We intend to continue to high-grade our portfolio, with a continued focus on operational excellence, safety, and stakeholder returns. The senior management team has a proven track record in developing technically difficult reservoirs, enhanced oil recovery and operating in remote locations in demanding jurisdictions. We aim to have meaningful and sustainable impact through social investments within the communities we operate. Our "Beyond Compliance Policy" focuses on our commitments to environmental, social and governance excellence.

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Oil and Gas Properties - Colombia and Ecuador

As of December 31, 2020, excluding blocks subject to relinquishment, we had interests in 27 blocks in Colombia, 3 blocks in Ecuador and were the operator on 28 of those blocks.

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Exploration Blocks & Commitments

The following table provides a summary of our exploration commitments for certain blocks as of December 31, 2020:

Basin	Block	Current Phase	Remaining Commitments, Current Phase
Colombia
Putumayo	Alea 1848-A	3 & 4	one exploration well
Putumayo	Alea 1947-C	2	one exploration well
Putumayo	PUT-1	2*	two exploration wells
Putumayo	PUT-2	2*	three exploration wells
Putumayo	PUT-4	1	one exploration well
Putumayo	PUT-7	2	two exploration wells
Putumayo	PUT-10	1*	73 km 2D seismic, two exploration wells
Putumayo	PUT-25	1	one exploration well
Putumayo	PUT-31	1	202 km 2D seismic, one exploration well
Llanos	LLA-1	1*	97.5 km2 3D seismic, one exploration well
Llanos	LLA-5	1*	133 km2 3D seismic, one exploration well
Llanos	LLA-22	1 & 2*	85 km2 3D seismic, one exploration well
Llanos	LLA-70	1*	163 km2 3D seismic, one exploration well
Llanos	LLA-85	1	50 km2 3D seismic, 451 km2 3D seismic reprocessing
MMV	VMM-24	1	50 km2 3D seismic, 100 km 2D seismic reprocessing, 100 km aerogeophysics, 100 km2 remote sensing, 80 km2 surface geochemistry, one exploration well
Ecuador
Oriente	Charapa	1	50 km 2D seismic, seven exploration wells
Oriente	Chanangue	1	five exploration wells
Oriente	Iguana	1	two exploration wells

*As of December 31, 2020, exploration has been suspended due to licensing restrictions, security issues or social reasons

Royalties

Colombian royalties are regulated under Colombia Law 756 of 2002, as modified by Law 1530 of 2012. All discoveries made subsequent to the enactment of Law 756 of 2002 have the sliding scale royalty described below. Discoveries made before the enactment of Law 756 of 2002 have a royalty of 20%, and in the case of such discoveries under association contracts reverted to the national government, an additional 12% applies for a total royalty of 32%.

The Agencia Nacional de Hidrocarburos (National Hydrocarbons Agency) (“ANH”) contracts have royalties that are based on a sliding scale described in Law 756 of 2002. These royalties work on an individual oil field basis starting with a base royalty rate of 8% for gross production of less than 5,000 bopd, increasing in a linear fashion from 8% to 20% for gross production between 5,000 and 125,000 bopd and is fixed at 20% for gross production between 125,000 and 400,000 bopd. For gross production

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between 400,000 and 600,000 bopd the rate increases in a linear fashion from 20% to 25%. For gross production in excess of 600,000 bopd the royalty rate is fixed at 25%. The Santana and Nancy-Burdine-Maxine Blocks have a fixed rate for existing production of 32% and 20%, respectively, and the sliding scale for new discoveries or incremental production duly approved by ANH. In addition to the sliding scale royalty, there are additional x-factor royalties of 1% for Llanos-22, Putumayo-2, Putumayo-4, Putumayo-7, Putumayo-21 and VMM-24; 2% for Llanos-85, 3% 5% for Putumayo-1; 12% for Putumayo-31; 19% for Putumayo 25; 31% for Llanos-1 and Llanos -70.

For gas fields, the royalty is on an individual gas field basis starting with a base royalty rate of 6.4% for gross production of less than 28.5 MMcf of gas per day. The royalty increases in a linear fashion from 6.4% to 16% for gross production between 28.5 MMcf of gas per day and 712.5 MMcf of gas per day and is stable at 16% for gross production between 712.5 to 2,280 MMcf of gas per day, and then increases in a linear fashion from 16% to 20% for gross production between 2.28 to 3.42 Bcf of gas per day. For gross production in excess of 3.42 Bcf of gas per day the royalty rate is fixed at 20%.

An additional high price share royalty ("HPR") is applicable to exploration and production contracts signed under new ANH oil regulatory regime in 2004 and onwards when cumulative gross production (net of royalty) from an Exploitation Area is greater than 5 MMbbls of oil and WTI reference price exceeds the trigger price defined in the contract. The HPR is calculated using the associated production multiplied by Q factor which is calculated as follows:

Q factor = (WTI price - Base Price(1))/WTI Price * 30%

Quality (Oil API)	(1)Base Price ($/bbl)
< 10 o	Nil
10o to 15o	57.20
15o to 22o	40.04
22o to 29o	38.61
> 29o	37.16

At December 31, 2020, HPR was applicable to our production from the Costayaco and Moqueta Exploitation Areas in the Chaza Block and the Acordionero Exploitation Area in the Midas Block.

In addition to these government royalties, our original interests in the Guayuyaco and Chaza Blocks acquired on our entry into Colombia in 2006 are subject to a third party royalty. The additional interests in Guayuyaco and Chaza that we acquired on the acquisition of Solana in 2008 are not subject to this third party royalty. The overriding royalty rights start with a 2% rate on working interest production less government royalties. For new commercial fields discovered within 10 years of the agreement date and after a prescribed threshold is reached, Crosby Capital, LLC (“Crosby”) reserves the right to convert the overriding royalty rights to a net profit interest (“NPI”). This NPI ranges from 7.5% to 10% of working interest production less sliding scale government royalties, as described above, and operating and overhead costs. No adjustment is made for the HPR. On certain pre-existing fields, Crosby does not have the right to convert its overriding royalty rights to an NPI. In addition, there are conditional overriding royalty rights that apply only to the pre-existing fields. Currently, we are subject to a 10% NPI on 50% of our working interest production from the Costayaco and Moqueta Fields in the Chaza Block and 35% of our working interest production from the Juanambu Field in the Guayuyaco Block, and overriding royalties on our working interest production from the Guayuyaco Field in the Guayuyaco Block.

The Putumayo-7 and Putumayo-1 Blocks are also subject to a third party royalty in addition to the government royalties. Pursuant to the terms of the agreement by which the interests in the Putumayo-7 Block were acquired, a 10% royalty on production from the Putumayo-7 Block is payable to a third party. The terms of the royalty allow for transportation costs, marketing and handling fees, government royalties (including royalties payable to the ANH pursuant to Section 39 of the contract for the Putumayo-7 Block - the “Rights Due to High Prices”) and taxes, other than taxes measured by the income of any party, and other than value added tax ("VAT") or any equivalent, to be paid in cash or kind to the Government of Colombia (or any federal, state, regional or local government agency) and ANH, and a 1% 'X' factor payment to be deducted from production revenue prior to the royalty being paid to a third party. Pursuant to the terms of the agreement by which the interests in the Putumayo-1 Block were acquired, a 3% royalty on production from the Putumayo-1 Block is payable to a third party. The terms of the royalty do not allow for any costs, royalties and taxes to be deducted from production revenue.

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Administrative Facilities

Our principal executive office is located in Calgary, Alberta, Canada. The Calgary office lease will expire on November 29, 2022. We also have offices in Colombia and Ecuador.

Estimated Reserves

Our 2020 reserves were independently prepared by McDaniel International Inc. (“McDaniel”), a wholly-owned subsidiary of McDaniel & Associates. McDaniel & Associates was established in 1955 as an independent Canadian consulting firm and has been providing oil and gas reserves evaluation services to the world's petroleum industry for the past 60 years. They have internationally recognized expertise in reserves evaluations, resource assessments, geological studies, and acquisition and disposition advisory services. McDaniel's office is located in Calgary, Canada. The technical person primarily responsible for the preparation of our reserves estimates at McDaniel meets the requirements regarding qualifications, independence, objectivity, and confidentiality set forth in the Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information promulgated by the Society of Petroleum Engineers.

The primary internal technical person in charge of overseeing the preparation of our reserve estimates is the Vice President, Asset Management. He has a Bachelor of Geological Engineering, graduating with Great Distinction, and a Masters of Chemical Engineering (petroleum). He is responsible for our engineering activities including reserves reporting, asset evaluation, reservoir management and field development. He has over 30 years of experience in the oil and gas industry with extensive experience in reservoir management, production and operations.

We have developed internal controls for estimating and evaluating reserves. Our internal controls over reserve estimates include: 100% of our reserves are evaluated by an independent reservoir engineering firm, at least annually; and review controls are followed, including an independent internal review of assumptions used in the reserve estimates and presentation of the results of this internal review to our reserves committee. Calculations and data are reviewed at several levels of the Company to ensure consistent and appropriate standards and procedures. Our policies are applied by all staff involved in generating and reporting reserve estimates including geological, engineering and finance personnel.

The process of estimating oil and gas reserves is complex and requires significant judgment, as discussed in Item 1A “Risk Factors”. The reserve estimation process requires us to use significant decisions and assumptions in the evaluation of available geological, geophysical, engineering and economic data for each property. Therefore, the accuracy of the reserve estimate is dependent on the quality of the data, the accuracy of the assumptions based on the data and the interpretations and judgment related to the data.

Proved reserves are reserves which, by analysis of geoscience and engineering data, can be estimated with reasonable certainty to be economically producible from a given date forward from known reservoirs under existing economic conditions, operating methods and government regulations prior to the time at which contracts providing the right to operate expires, unless evidence indicates that renewal is reasonably certain. The term “reasonable certainty” implies a high degree of confidence that the quantities of oil or natural gas actually recovered will equal or exceed the estimate. To achieve reasonable certainty, we and the independent reserve engineers employed technologies that have been demonstrated to yield results with consistency and repeatability. Estimates of proved reserves are generated through the integration of relevant geological, engineering, and production data, utilizing technologies that have been demonstrated in the field to yield repeatable and consistent results as defined in the SEC regulations. Data used in these integrated assessments included information obtained directly from the subsurface through wellbores, such as well logs, reservoir core samples, fluid samples, static and dynamic pressure information, production test data, and surveillance and performance information. The data utilized also included subsurface information obtained through indirect measurements, such as seismic data. The tools used to interpret the data included proprietary and commercially available seismic processing software and commercially available reservoir modeling and simulation software. Reservoir parameters from analogous reservoirs were used to increase the quality of and confidence in the reserves estimates when available. The method or combination of methods used to estimate the reserves of each reservoir was based on the unique circumstances of each reservoir and the dataset available at the time of the estimate. Probable reserves are reserves that are less certain to be recovered than proved reserves but which, together with proved reserves, are as likely as not to be recovered. Estimates of probable reserves which may potentially be recoverable through additional drilling or recovery techniques are by nature more uncertain than estimates of proved reserves and accordingly are subject to substantially greater risk of not actually being realized by us. The probable reserves that have been assigned as of December 31, 2020 were based on both the greater percentage of recovery of the hydrocarbons in place than assumed for proved reserves, as well as to areas of a reservoir adjacent to proved reserves where data control or interpretations of available data are less certain.

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Possible reserves are reserves that are less certain to be recovered than probable reserves. Estimates of possible reserves are also inherently imprecise. Estimates of probable and possible reserves are also continually subject to revisions based on production history, results of additional exploration and development, price changes and other factors. The possible reserves that have been assigned as of December 31, 2020 were based on both the greater percentage of recovery of the hydrocarbons in place than assumed for probable reserves as well as to areas of a reservoir adjacent to probable reserves where data control or interpretations of available data are less certain.

The following table sets forth our estimated reserves NAR as of December 31, 2020:

	Oil	Natural Gas	Oil and Natural Gas
Reserves Category	(Mbbl)	(MMcf)	(MBOE)
Proved
Total proved developed reserves	38,660	633	38,766
Total proved undeveloped reserves	26,032	1,022	26,202
Total proved reserves	64,692	1,655	64,968
Probable (1)
Total probable developed reserves	16,818	96	16,834
Total probable undeveloped reserves	26,997	1,044	27,171
Total probable reserves	43,815	1,140	44,005
Possible (1)
Total possible developed reserves	14,145	205	14,179
Total possible undeveloped reserves	29,171	1,206	29,372
Total possible reserves	43,316	1,411	43,551

(1) Estimates of probable and possible reserves are more uncertain than proved reserves, but have not been adjusted for risk due to that uncertainty. Accordingly, estimates of probable and possible reserves are not comparable and have not been, or should not be, summed arithmetically with each other or with estimates of proved reserves.

Product Prices Used In Reserves Estimates

The product prices that were used to determine the future gross revenue for each property reflect adjustments to the benchmark prices for gravity, quality, local conditions and/or distance from market. The average realized prices for reserves in the report are:

Oil ($/bbl) - Colombia	$	35.33
Natural Gas ($/Mcf) - Colombia	$	3.67
ICE Brent - average of the first day of each month price for the 12-month period	$	43.43

These prices should not be interpreted as a prediction of future prices. We do not represent that this data is the fair value of our oil and gas properties, or a fair estimate of the present value of cash flows to be obtained from their development and production.

Proved Undeveloped Reserves

At December 31, 2020, we had total proved undeveloped reserves NAR of 26.2 MMBOE (December 31, 2019 - 31.0 MMBOE), which were 100% in Colombia (December 31, 2019 – 100% in Colombia). Approximately 51%, 12%, 14% and 15% for a total of 92% of proved undeveloped reserves are located in our Acordionero, Cohembi, Costayaco and Moqueta Fields, respectively, in Colombia. None of our proved undeveloped reserves at December 31, 2020 have remained undeveloped for five years or more since initial disclosure as proved reserves and we have adopted a development plan which indicates that the proved undeveloped reserves are scheduled to be drilled within five years of initial disclosure as proved reserves.

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Changes in proved undeveloped reserves during the year ended December 31, 2020 are shown in the table below:

	Colombia - Oil Equivalent (MMBOE)
Balance, December 31, 2019	$	31.0
Converted to proved producing	$	(4.9)
Technical and economic revisions	$	(1.8)
Extensions	$	0.9
Improved recovery	$	1.0
Balance, December 31, 2020	$	26.2

Changes in proved undeveloped reserves during the year ended December 31, 2020 shown in the table above primarily resulted from the following significant factors:

Converted to Proved Producing. In 2020, we converted 4.9 MMBOE, or 16% of 2019 proved undeveloped reserves to developed status. In 2020, we made investments consisting solely of capital expenditures of $19.3 million in Colombia associated with drilling 8 wells in the Midas Block.

Technical and Economic Revisions. During the year ended December 31, 2020, we experienced revisions of 1.8 MMBOE of proved undeveloped reserves primarily as a result of an increase in uneconomic reserves due to lower pricing.

Extensions. We added 0.9 MMBOE to proved undeveloped reserves during the year ended December 31, 2020, which were attributed to extensions of 0.4 MMBOE in the Acordionero field and 0.5 MMBOE in the Costayaco field.

Improved Recoveries. We added 1.0 MMBOE to proved undeveloped reserves during the year ended December 31, 2020, which were attributed to better recoveries of heavy oil in the Acordionero field.

Production, Revenue and Price History

Certain information concerning production, prices, revenues and operating expenses for the years ended December 31, 2020 and 2019 is set forth in Item 7 “Management's Discussion and Analysis of Financial Condition and Results of Operations” and in the “Supplementary Data (Unaudited)” provided following our Financial Statements in Item 8, which information is incorporated by reference here.

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The following table presents NAR oil production, average sales prices and operating expenses per NAR oil production from our major Fields Costayaco, Moqueta, Cohembi and Acordionero and from all of our properties for each of the three years ended December 31, 2020:

	Costayaco (1)		Moqueta (1)		Cohembi (1)		Acordionero (1)		Total for all   properties (2)
Year Ended December 31, 2020
Oil production NAR bbl	1,773,723		792,011		438,799		3,612,338		7,346,200
Average sales price of oil per bbl	$	32.07	$	31.52	$	32.32	$	32.45	$	32.38
Operating expenses of oil per bbl (3)	$	17.63	$	17.71	$	15.60	$	12.19	$	16.67
Year Ended December 31, 2019
Oil production NAR bbl	1,966,585		1,022,391		675,086		5,166,430		10,590,137
Average sales price of oil per bbl	$	56.38	$	55.93	$	54.35	$	54.17	$	53.92
Operating expenses of oil per bbl (3)	$	18.95	$	18.88	$	23.94	$	14.60	$	19.23
Year Ended December 31, 2018
Oil production NAR bbl	2,244,497		1,020,673		324,798		5,469,072		10,604,197
Average sales price of oil per bbl	$	58.19	$	59.87	$	55.06	$	57.64	$	57.85
Operating expenses of oil per bbl (3)	$	22.23	$	20.47	$	22.81	$	11.22	$	16.47

(1) 100% of product sales were oil

(2) Includes de minimis natural gas production from non-core properties from Colombia of 214,719 Mcf (35,787 boe), 361,065 Mcf

(60,178 boe) and 208,961 Mcf (34,827 boe) for each of the years ended December 31, 2020, 2019 and 2018, respectively

(3) Operating expenses include operating and transportation expenses

We prepared the estimate of standardized measure of proved reserves in accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification 932, “Extractive Activities – Oil and Gas”.

Drilling Activities

The following table summarizes the results of our exploration and development drilling activity for the past three years. Wells labeled as “In Progress” for a year were in progress as of December 31, 2020, 2019 or 2018. This information should not be considered indicative of future performance, nor should it be assumed that there was any correlation between the number of

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productive wells drilled and the oil and gas reserves generated thereby or the costs to Gran Tierra of productive wells compared to the costs of dry holes.

	2020		2019		2018
	Gross	Net	Gross	Net	Gross	Net
Exploration
Productive	—	—	3.00	2.50	1.00	1.00
Dry	—	—	1.00	1.00	1.00	0.51
In progress	—	—	2.00	2.00	3.00	3.00
Development
Productive	6.00	6.00	22.00	22.00	19.00	18.16
Dry	—	—	2.00	2.00	—	—
In progress	1.00	1.00	1.00	1.00	4.00	4.00
Service
Water injectors	1.00	1.00	5.00	5.00	—	—
Total Colombia	8.00	8.00	36.00	35.50	28.00	26.67

Of the three wells in progress in Colombia as at December 31, 2019, one was inactive pending future tests and two were dry at December 31, 2020.

In 2020, we continued work on power reliability and expansion infrastructure in Acordionero and Cohembi fields.

Well Statistics

The following table sets forth our productive wells as of December 31, 2020:

	Oil Wells
	Gross	Net
Colombia (1)	224.0	190.0
	224.0	190.0

(1) Includes 38.0 gross and 33.1 net water and gas injector wells and 70.0 gross and 67.1 net wells with multiple completions.

We commenced the execution of our 2021 capital program, as planned, and as of February 19, 2021, drilled six development wells and one water injector in the Midas Block

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Developed and Undeveloped Acreage

At December 31, 2020, our acreage was located 93% in Colombia and 7% in Ecuador. The following table sets forth our developed and undeveloped oil and gas lease and mineral acreage as of December 31, 2020:

	Developed		Undeveloped (2)		Total
	Gross	Net	Gross	Net	Gross	Net
Colombia (1)	312,302	219,913	1,544,097	1,534,552	1,856,399	1,754,465
Ecuador	—	—	138,239	138,239	138,239	138,239
Total	312,302	219,913	1,682,336	1,672,791	1,994,638	1,892,704

(1) Excludes our interest in one block with a total of 0.1 million net acres for which government approval of relinquishment or sale was pending at December 31, 2020.

(2) As of December 31, 2020 the exploration phase for 0.3 million gross and net undeveloped acres expires within next three years with an option to extend exploration phase for 50% of the expired area.

Marketing and Major Customers

Colombia represents 100% of our production with oil reserves and production mainly located in the Middle Magdalena Valley (“MMV”) and Putumayo Basin. In MMV, our largest field is the Acordionero Field, where we produce approximately 17° API oil, which represented 49% of total Company production in 2020. The Putumayo production is approximately 27° API for Chaza Block and 18° API for Suoriente Block, which represented 44% of total Company production in 2020.

We have entered into numerous sales agreements for our production from MMV and the Putumayo Basin with domestic and international customers. These agreements are subject to renegotiation terms between three and twelve months and generally contain mutual termination provisions with 90 days' notice. The volume of crude oil contemplated in these sales agreements does not include the volume of oil corresponding to royalties taken in kind, but does include volumes relating to HPR royalties.

The majority of our Putumayo production is sold at wellhead. The oil is picked up by customers at Company operated truck loading stations located at our Costayaco battery or Santana station facilities in Putumayo North, and at our Cohembi and Cumplidor Fields in Putumayo South. Production from the Acordionero Field in MMV is trucked and sold at various terminals or pipeline inlets, and at various distances from the Acordionero field depending on the applicable sales agreement. Production from MMV minor fields is sold at wellhead.

In 2020, approximately 86% of our Putumayo production and 51% of our MMV production was sold to two international marketers, for which the sales agreements expire on August 31, 2021 and June 30, 2021, respectively. The loss of each individual sales customer will not have a material adverse impact on our Company as customers can be substituted.

We receive revenues for our Colombian oil sales in U.S. dollars. Oil prices for sales of our crude oil are defined by agreements with the purchasers of the oil and are based generally on an average price for crude oil, referenced to ICE Brent, with adjustments for differences in quality, specified fees, transportation fees and transportation tax. Pipeline tariffs are denominated in U.S. dollars and trucking costs are in Colombian Pesos.

Competition

The oil and gas industry is highly competitive. We face competition from both local and international companies. This competition impacts our ability to acquire properties, contract for drilling and other oil field equipment and secure trained personnel. Many competitors, such as Colombia's and Ecuador's national oil companies, have greater financial and technical resources. Our larger or more integrated competitors may be able to absorb the burden of existing, and any changes to, federal, state and local laws and regulations more easily than we can, which could adversely affect our competitive position. Our ability to acquire additional properties and to discover reserves in the future will depend on our ability to evaluate and select suitable properties and to consummate transactions in a highly competitive environment. There is substantial competition for land contracts, prospects and resources in the oil and natural gas industry, and we compete to develop and produce those reserves cost effectively. In addition, we compete to monetize our oil production: for transportation capacity and infrastructure for the delivery of our products, to maintain a skilled workforce and to obtain quality services and materials.

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Geographic Information

Based on geographic organization, Colombia is the only reportable segment. During 2019, we signed participation contracts for three blocks in Ecuador. As at and for the years ended December 31, 2020 and 2019, the Ecuador business unit was not significant and was included in our Colombia reportable segment. Long lived assets are Property, Plant and Equipment, which include all oil and gas assets, furniture and fixtures, automobiles, computer equipment and capitalized leases. No long lived assets are held in our country of domicile, which is the United States of America. Assets held by our corporate head office in Calgary, Alberta, Canada were not significant as of December 31, 2020 and 2019 and were included into the Colombia reportable segment under "other" category. Because all of our exploration and development operations are in Colombia and Ecuador, we face many risks associated with these operations. See Item 1A “Risk Factors” for risks associated with our foreign operations.

Regulation

The oil and gas industry in both Colombia and Ecuador is heavily regulated. Rights and obligations with regard to exploration, development and production activities are explicit for each project; economics are governed by a royalty/tax regime. Various government approvals are required for property acquisitions and transfers, including, but not limited to, meeting financial and technical qualification criteria in order to be certified as an oil and gas company in the country. Oil and gas concessions are typically granted for fixed terms with opportunity for extension.

Colombia Administration

We operate in Colombia through Colombian branches of the following entities: Gran Tierra Energy Colombia LLC, Gran Tierra Colombia Inc. and Gran Tierra Energy Resources Inc. Gran Tierra Energy Colombia LLC and Gran Tierra Colombia Inc. are currently qualified as operators of oil and gas properties by the National Hydrocarbons Regulator ("ANH"). The entities operate under a special regime for hydrocarbon companies in Colombia that entitles them to collect proceeds from oil sales abroad in US dollars.

In Colombia, the ANH is the administrator of the hydrocarbons in the country and therefore is responsible for the administration of Colombian oil and gas contracts and managing all exploration lands. Ecopetrol, the Colombian national oil company, is a public company listed in the Colombian and United States stock markets, owned in majority by the state with the main purpose of exploring and producing hydrocarbons similar to any other oil company. In addition, Ecopetrol is a major purchaser and marketer of oil in Colombia and directly or through its subsidiaries operates the majority of the oil transportation infrastructure in the country.

The ANH uses various forms of contracts, which provide full risk/reward benefits for the contractor. Under the terms of these contracts, the operator retains the rights to produce all reserves, production and income from any new exploration and evaluation block, subject to existing royalty and tax regulations. Each contract contains an exploration period and a production period. The exploration period contains a number of exploration phases and each phase has an associated work commitment. The production period lasts a number of years (usually 24) from the declaration of a commercial hydrocarbon discovery. Such contracts may be terminated at election of the ANH on the failure of the contract holder to comply with certain material terms of the contract, such as failure to perform committed exploration operations or investments in accordance with the contract.

When operating under a contract, the contractor is the owner of the hydrocarbons extracted from the contract area during the performance of operations, except for royalty volumes which are collected by the ANH (or its designee). The contractor can market the hydrocarbons in any manner whatsoever, subject to a limitation in the case of natural emergencies where the law specifies the manner of sale.

Ecuador Administration

We operate in Ecuador through the Ecuadorian branch of Gran Tierra Energy Colombia, LLC.

In Ecuador, the Ministry of Energy and Non-Renewable Natural Resources ("MERNNR", for its acronym in Spanish) is responsible for signing the oil and gas contracts and regulating the Ecuadorian oil and gas industry through the Agency for Regulation and Control of Energy and Non-Renewable Natural Resources.

The MERNNR uses Service and Participation Contracts for the Exploration and/or Exploitation of Hydrocarbons. We currently hold three Participation Contracts which provide for full risk for the contractor and production sharing with the MERNNR and contain an exploration period and an exploitation period. The exploration period has an associated work commitment and lasts

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typically 4 years. The exploitation period lasts usually 20 years from the approval of the development plan for a commercial hydrocarbon discovery. Such contracts may be terminated at the election of the MERNNR on the failure of the contract holder to comply with certain material terms of the contract, such as failure to perform committed exploration operations in accordance with the contract.

When operating under a Participation Contract, the contractor is the owner of the hydrocarbons extracted from the contract area during the performance of operations, except for the share of volumes owned by the MERNNR agreed under each contract.

Environmental Compliance

Our activities are subject to laws and regulations governing environmental compliance quality, waste and pollution control in the countries where we maintain operations. Our activities with respect to exploration, drilling, production facilities, including the operation and construction of pipelines, plants and other facilities for transporting, processing, treating or storing oil and other products, are subject to stringent environmental regulation by regional and federal authorities in Colombia and Ecuador. Such regulations relate to mandatory environmental impact studies, the discharge of pollutants into air and water, water use and management, the management of non-hazardous and hazardous waste, including its transportation, storage, and disposal, permitting for the construction of facilities, recycling requirements and reclamation standards, and the protection of certain plants and animal species as well as cultural resources and areas inhabited by indigenous peoples, among others. Risks are inherent in oil and gas exploration, development and production operations. These risks include blowouts, fires, or spills. Significant costs and liabilities may be incurred in connection with environmental compliance issues. Licenses and permits required for our exploration and production activities may not be obtainable on reasonable terms or on a timely basis, which could result in delays and have an adverse effect on our operations. Spills and releases into the environment of petroleum products can result in remediation costs and liability for damages. The costs of remedying such conditions may be significant, and remediation obligations could adversely affect our financial condition, results of operations and prospects. Moreover, violations of environmental laws and regulations can result in the issuance of administrative, civil or criminal fines and penalties, as well as orders or injunctions prohibiting some or all of our operations in affected areas. In addition, indigenous groups or other local organizations could oppose our operations in their communities, potentially resulting in delays which could adversely affect our operations. Governmental or judicial actions may influence the interpretation and enforcement of environmental laws and regulations and may thereby increase licensing and compliance costs. We do not expect that the cost of compliance with regional and federal provisions, which have been enacted regulating the discharge of materials into the environment, or otherwise relating to the protection of the environment or natural resources, will be material to us.

We have implemented a company wide web-based reporting system which allows us to track incidents and respective corrective actions and associated costs. We have a Corporate Health, Safety, and Environmental Management Policy and Plan as well as a Corporate Environmental Management Plan ("EMP"). The EMP is based on the environmental performance standards of the World Bank/IFC and reflects best industry practices. We have an Environmental Management System which is ISO14001:2015 certified representing compliance with internationally recognized industry best practice, as well as an environmental risk management program and robust waste management procedures. Air, soil and water testing occur regularly and environmental contingency plans have been prepared for all sites and transportation of oil. We have a regular quarterly reporting system, reporting to executive management as well as an HSE committee of the Board of Directors. We have a schedule of internal and external audits and routine checking of practices and procedures and conduct emergency response exercises.

In 2020, we continued with environmental clean-up activities in the Suroriente Block. The remediation activities address the oil spills originated in 2013 by illegal groups in the area. We are undertaking an estimated total clean-up of 28 hectares of which 21 hectares have already been cleaned up. Activities took place during the first quarter of 2020 and the total amount spent was $1.3 million for the year ended December 31, 2020.

Employees

At December 31, 2020, we had 322 full-time employees (December 31, 2019 - 362): 95 located in the Calgary corporate office, 226 in Colombia (156 staff in Bogota and 70 field personnel), and one in Ecuador (Quito). None of our employees are represented by labor unions, and we consider our employee relations to be good. Safety is one of our greatest priorities, and we have implemented safety management systems, procedures and tools to help protecting our employees and contractors. We strive to hire local employees and have provided training programs for employees, including special programs for women, to develop specialized skills necessary for our industry. We also focus on career development to create opportunities for advancement and strengthened local leadership at our worksites.

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Available Information

We file or furnish annual, quarterly and current reports, proxy statements and other documents with the Securities and Exchange Commission (“SEC”). We make available free of charge through our website at www.grantierra.com our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and all amendments to those reports as soon as reasonably practicable after such material is electronically filed or furnished with the SEC. Our Code of Business Conduct and Ethics, our Corporate Governance Guidelines, our Audit Committee Charter, our Compensation Committee Charter and our Nominating and Corporate Governance Committee Charter are also posted to the governance section of our website. Our website address is provided solely for informational purposes. Information on our website is not incorporated into this Annual Report or otherwise made part of this Annual Report. We intend to use our website as means for distributing information to the public for purposes of compliance with Regulation Fair Disclosure.

In addition, the SEC maintains a website (www.sec.gov) that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC, including us.

Item 1A. Risk Factors

Risks Related to our Business

Prices and markets for oil and natural gas are unpredictable and tend to fluctuate significantly, which could cause temporary suspension of production and reduce our value

Substantially all of our revenues are derived from the sale of oil. The current and forward contract oil price is based on world demand, supply, weather, pipeline capacity constraints, inventory storage levels, geopolitical unrest, world health events and other factors, all of which are beyond our control. Historically, the market for oil has been volatile and is expected to remain so. During 2020, global oil and natural gas prices declined to historic lows due to a dispute between major oil producing countries combined with the impact of the shutdown in the world economy to mitigate the impact of the COVID-19 pandemic. We expect that oil prices in the near term will continue to be influenced by the duration and severity of the COVID-19 pandemic and its resulting impact on oil and natural gas demand. Furthermore, prices which we receive for our oil sales, while based on international oil prices, are established by contracts with purchasers and include the deductions for transportation and quality differentials. The differentials and transportation costs can change over time and have a detrimental impact on realized prices.

As a result of the low commodity price environment in 2020, we temporarily suspended development and workover activities and operations in fields with low or negative netbacks, which were recommenced in the fourth quarter of 2020. If our production and cash flows decline, it could have a material adverse effect on our results of operations and result in impairments and non-compliance with financial covenants in our debt instruments. For example, for the year ended December 31, 2020, we recorded $102.6 million impairment of goodwill and $564.5 million of oil and gas property and inventory impairment relating to our Colombia business unit. The goodwill impairment was due to the carrying value of the unit exceeding its fair value as a result of the cumulative impact of the shut-in of uneconomic oil production in and lower forecasted commodity prices. The oil and gas property impairment was a result of the net book value of oil and gas assets in our Colombia business unit, less related deferred income taxes, exceeding a calculated “ceiling”.

A period of sustained low prices may have a material adverse effect on our financial condition, the future results of our operations (including rendering existing projects unprofitable or requiring temporary suspension of fields), financing available to us, and quantities of reserves recoverable on an economic basis, as well as the market price for our securities.

We may be adversely affected by global epidemics, including the recent COVID-19 pandemic

The outbreak of the COVID-19 virus, which was declared a pandemic by the World Health Organization, has spread across the globe and impacted worldwide economic activity since early 2020. Governments worldwide, including those in Colombia and Ecuador, the countries where we operate, enacted emergency measures to combat the spread of the virus. These measures, which include the implementation of travel bans, self-imposed quarantine periods and social distancing, have caused material disruption to businesses globally resulting in an economic slowdown. Governments and central banks have reacted with significant monetary and fiscal interventions designed to stabilize economic conditions however the long-term success of these interventions is not currently determinable. In addition, global commodity prices declined significantly in 2020 due to the dramatic decline in demand for oil and natural gas, coupled with oversupply in the midst of a dispute between OPEC and other major oil producing countries. Despite the recent improvement in oil prices, this challenging economic climate has had and may in the future have significant adverse impacts on our Company including, but not exclusively:

•material declines in revenue and cash flows as a result of the decline in commodity prices;

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•declines in revenue and operating activities due to reduced capital programs and the shut-in of production;

•impairment charges;

•inability to comply with covenants and restrictions in debt agreements;

•inability to access financing sources;

•increased risk of non-performance by our customers and suppliers; and

•interruptions in operations as we adjust personnel to the dynamic environment.

The situation is dynamic and the ultimate duration and magnitude of the impact on the economy and the financial effect on our Company is not fully known at this time. Estimates and judgments made by management in the preparation of the financial statements are increasingly difficult and subject to a higher degree of measurement uncertainty during this volatile period. The pandemic and resulting worldwide economic downturn could create risks we have not identified or amplify the impact of other risks we have identified.

Estimates of oil and natural gas reserves may be inaccurate and our actual revenues may be lower than estimated

We make estimates of oil and natural gas reserves, upon which we base our financial projections and capital expenditure plans. We make these reserve estimates using various assumptions, including assumptions as to oil and natural gas prices, drilling and operating expenses, capital expenditures, taxes and availability of funds. Some of these assumptions are inherently subjective, and the accuracy of our reserve estimates relies in part on the ability of our management team, engineers and other advisors to make accurate assumptions. Wells that are drilled may not achieve the results expected. Economic factors beyond our control, such as world oil prices, interest rates, inflation, and exchange rates, will also impact the quantity and value of our reserves.

The process of estimating oil and natural gas reserves is complex, and requires us to use significant decisions and assumptions in the evaluation of available geological, geophysical, engineering and economic data for each property. As a result, our reserves estimates are inherently imprecise. All categories of reserves are continually subject to revisions based on production history, results of additional exploration and development, price changes and other factors. When producing an estimate of the amount of oil that is recoverable from a particular reservoir, probable reserves are those additional reserves that are less certain to be recovered than proved reserves but which, together with proved reserves, are as likely as not to be recovered. Possible reserves are even less certain and generally require only a 10% or greater probability of being recovered. Estimates of probable and possible reserves are by their nature much more speculative than estimates of proved reserves and are subject to greater uncertainties, and accordingly the likelihood of recovering those reserves is subject to substantially greater risk. Actual future production, oil and natural gas prices, revenues, taxes, exploration and development expenditures, operating expenses and quantities of recoverable oil and natural gas reserves may vary substantially from those we estimate. Such changes could materially reduce our revenues and result in the impairment of our oil and natural gas interests.

Unless we are able to replace our reserves and production, and develop and manage oil and natural gas reserves and production on an economically viable basis, our financial condition and results of operations will be adversely impacted

Our future success depends on our ability to find, develop and acquire additional oil and natural gas reserves that are economically recoverable. Producing oil and natural gas reservoirs generally are characterized by declining production rates that vary depending upon reservoir characteristics and other factors. Our future oil and natural gas reserves and production, and therefore our cash flow and results of operations, are highly dependent on our success in efficiently developing and exploiting our current reserves and economically finding or acquiring additional recoverable reserves. The value of our securities and our ability to raise capital will be adversely impacted if we are not able to replace our reserves that are depleted by production. We may not be able to develop, exploit, find or acquire sufficient additional reserves to replace our current and future production.

Exploration, development and production costs (including operating and transportation costs), marketing costs (including distribution costs) and regulatory compliance costs (including taxes) will substantially impact the net revenues we derive from the oil and natural gas that we produce. These costs are subject to fluctuations and variations in the areas in which we operate, and we may not be able to predict or control these costs. If these costs exceed our expectations, this may adversely affect our results of operations.

Our future reserves will depend not only on our ability to develop and effectively manage then-existing properties, but also on our ability to identify and acquire additional suitable producing properties or prospects, to identify and retain responsible service providers and contractors to efficiently drill and complete our wells and to find markets for the oil and natural gas we develop and to effectively distribute our production into our markets.

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Exploration for oil and natural gas, and development of new formations, is risky

Oil and natural gas exploration involves a high degree of operational and financial risk. These risks are more acute in the early stages of exploration, appraisal and development. It is difficult to predict the results and project the costs of implementing an exploratory drilling program due to the inherent uncertainties and costs of drilling in unknown formations and encountering various drilling conditions, such as unexpected formations or pressures, premature decline of reservoirs, the invasion of water into producing formations, tools lost in the hole, and changes in drilling plans and locations as a result of prior exploratory wells or additional seismic data and interpretations thereof. Future oil and gas exploration may involve unprofitable efforts, not only from dry wells, but from wells that are productive but do not produce sufficient net revenues to return a profit after drilling, operating and other costs.

Oil and natural gas exploration, development and production operations are subject to the risks and hazards typically associated with such operations, including, but not limited to, fire, explosion, blowouts, cratering, sour gas releases, spills and other environmental hazards. Such risks and hazards could result in substantial damage to oil and natural gas wells, production facilities, other property or the environment, as well as personal injury to our employees, contractors or members of the public.

Losses resulting from the occurrence of any of these risks may have a material adverse effect on our business, financial condition, results of operations and prospects.

Although we maintain well control and liability insurance in an amount that we consider prudent and consistent with industry practice, liabilities associated with certain risks could exceed policy limits or not be covered. In either event we could incur significant costs.

Our business is subject to local legal, social, political and economic factors that are beyond our control, which could impair or delay our ability to expand our operations or operate profitably

All of our proved reserves and production are currently located in Colombia; however, we may eventually expand to other countries. Exploration and production operations are subject to legal, social, political and economic uncertainties, including terrorism, military repression, social unrest and activism, blockades, strikes by local or national labor groups, interference with private contract rights, extreme fluctuations in currency exchange rates, high rates of inflation, exchange controls, changes in tax rates, changes in laws or policies affecting environmental issues (including land use and water use), workplace safety, foreign investment, foreign trade, investment or taxation, as well as restrictions imposed on the oil and natural gas industry, such as restrictions on production, price controls and export controls. When such disruptions occur, they may adversely impact our operations and threaten the economic viability of our projects or our ability to meet our production targets.

Both Colombia and Ecuador have experienced and may in the future experience political and economic instability. This instability could result in new governments or the adoption of new policies, laws or regulations that might assume a substantially more hostile attitude toward foreign investment, including but not limited to: the imposition of additional taxes; nationalization; changes in energy or environmental policies or the personnel administering them; changes in oil and natural gas pricing policies; and royalty changes or increases. In an extreme case, such a change could result in termination of contract rights and expropriation of foreign-owned assets or renegotiation or nullification of existing concessions and contracts. Any changes in the oil and gas or investment regulations and policies or a shift in political attitudes in Ecuador or Colombia are beyond our control and may significantly hamper our ability to expand our operations or operate our business at a profit.

We are vulnerable to risks associated with geographically concentrated operations

The vast majority of our production comes from four fields located in Colombia. For the year ended December 31, 2020, the Acordionero, Costayaco, Moqueta and Cohembi Fields collectively generated 90% of our production and at December 31, 2020, these four fields accounted for 88% of our proved reserves. As a result of this concentration, we may be disproportionately exposed to the impact of, among other things, regional supply and demand factors including limitations on our ability to most profitably sell or market our oil to a smaller pool of potential buyers, delays or interruptions of production from wells in these areas caused by governmental regulation, community protests, guerrilla activities, processing or transportation capacity constraints, continued authorization by the government to explore and drill in these areas, severe weather events and the availability of drilling rigs and related equipment, facilities, personnel or services. Due to the concentrated nature of our portfolio of properties, a number of our properties could experience any of the same conditions at the same time, resulting in a relatively greater impact on our results of operations than they might have on other companies that have a more diversified portfolio of properties.

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We rely on local infrastructure and the availability of transportation for storage and shipment of our products. This infrastructure, including storage and transportation facilities, is less developed than that in North America and may be insufficient for our needs at commercially acceptable terms in the localities in which we operate. Further, we operate in remote areas and may rely on helicopters, boats or other transportation methods. Some of these transport methods may result in increased levels of risk, including the risk of accidents involving serious injury or loss of life, and could lead to operational delays which could affect our ability to add to our reserve base or produce oil and could have a significant impact on our reputation or cash flow. Additionally, some of this equipment is specialized and may be difficult to obtain in our areas of operations, which could hamper or delay operations, and could increase the cost of those operations. In 2020 we experienced a local farmers blockade at Suroriente and PUT-7 Blocks, which has negatively impacted our annual production. The local farmers blockade has been resolved at the end of the third quarter of 2020.

Social disruptions or community disputes in our areas of operations may delay production and result in lost revenue

To enjoy the support and trust of local populations and governments, we must demonstrate a commitment to providing local employment, training and business opportunities; a high level of environmental performance; open and transparent communication; and a willingness to discuss and address community issues including community development investments that are carefully selected, not unduly costly and bring lasting social and economic benefits to the community and the area. Improper management of these relationships could lead to a delay or suspension of operations, loss of license or major impact to our reputation in these communities, which could adversely affect our business. We cannot ensure that such issues or disruptions will not be experienced in the future and we cannot predict their potential impacts, which may include delays or loss of production, standby charges, stranded equipment, or damage to our facilities. We also cannot ensure that we will not experience protests or blockades erected by criminal groups or cultivators of illegal crops, in response to the Colombian government's eradication of such crops, if such crops are grown in proximity to roads required to access our operations. In addition, we must comply with legislative requirements for prior consultation with communities and ethnic groups who are affected by our proposed projects in Colombia and Ecuador. Notwithstanding our compliance with these requirements, we may be sued by such communities through a writ for protection of tutela in the Colombian courts for enhanced consultation, potentially leading to increased costs, operational delays and other impacts. In addition, several areas in Colombia have conducted Popular Consultations and essential referendums on extractive industries. The referendums were organized by opponents of the mining or oil and natural gas industries. It remains unclear to what extent such results can impact the exercise of mineral rights conferred by the national government.

Security concerns in Colombia or Ecuador may disrupt our operations

Oil pipelines have historically been primary targets of terrorist activity in Colombia. Although a Peace Agreement was ratified by Colombian government in 2016, the result of which was the demobilization and disarmament of the Revolutionary Armed Forces of Colombia ("FARC"), there continue to be examples of violence against pipelines and other infrastructure that has been attributed to such FARC groups. It is not currently known whether or to what degree violence will continue and whether and to what degree that violence may impact our operations. Notwithstanding the Peace Agreement ratified and the ongoing efforts to implement such Agreements as well as the continuing attempts by the Colombian government to reduce or prevent activity of guerrilla dissidents, such efforts may not be successful and such activity may continue to disrupt our operations in the future or cause us higher security costs and could adversely impact our financial condition, results of operations or cash flows.

Colombia and Ecuador also both have a history of security problems. Our efforts to ensure the security of our physical assets may not be successful and there can also be no assurance that we can maintain the safety of our or our contractors' field personnel and our Bogota and Quito head office personnel or operations in Colombia and Ecuador or that this violence will not adversely affect our operations in the future and cause significant loss. If these security problems disrupt our operations, our financial condition and results of operations could be adversely affected.

All of our revenue is generated outside of Canada and the United States, and if we determine to, or are required to, repatriate earnings from foreign jurisdictions, we could be subject to taxes

All of our revenue is generated outside of Canada and the United States. The cash generated from operations abroad is generally not available to fund domestic or head office operations unless funds are repatriated. At this time, we do not intend to repatriate further funds, other than to pay head office charges, but if we did, we might have to accrue and pay withholding taxes in certain jurisdictions on the distribution of accumulated earnings. Undistributed earnings of foreign subsidiaries are considered to be

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permanently reinvested and a determination of the amount of unrecognized deferred tax liability on these undistributed earnings is not practicable.

The threat and impact of cyberattacks may adversely impact our operations and could result in information theft, data corruption, operational disruption, and/or financial loss

We use digital technologies and software programs to interpret seismic data, manage drilling rigs, conduct reservoir modeling and reserves estimation, as well as to process and record financial and operating data. We depend on digital technology, including information systems and related infrastructure as well as cloud application and services, to store, transmit, process and record sensitive information (including trade secrets, employee information and financial and operating data), communicate with our employees and business partners, analyze seismic and drilling information, estimate quantities of oil and gas reserves and for many other activities related to our business. The complexities of the technologies needed to explore for and develop oil and gas in increasingly difficult physical environments, and global competition for oil and gas resources make certain information attractive to thieves. Our business processes depend on the availability, capacity, reliability and security of our information technology infrastructure and our ability to expand and continually update this infrastructure in response to our changing needs and therefore it is critical to our business that our facilities and infrastructure remain secure. While we have implemented strategies to mitigate impacts from these types of events, we cannot guarantee that measures taken to defend against cybersecurity threats will be sufficient for this purpose. The ability of the information technology function to support our business in the event of a security breach or a disaster such as fire or flood and our ability to recover key systems and information from unexpected interruptions cannot be fully tested and there is a risk that, if such an event actually occurs, we may not be able to address immediately the repercussions of the breach or disaster. In that event, key information and systems may be unavailable for a number of days or weeks, leading to our inability to conduct business or perform some business processes in a timely manner. Moreover, if any of these events were to materialize, they could lead to losses of sensitive information, critical infrastructure, personnel or capabilities essential to our operations and could have a material adverse effect on our reputation, financial condition or results of operations.

Our employees have been and will continue to be targeted by parties using fraudulent “spoof” and “phishing” emails to misappropriate information or to introduce viruses or other malware through “trojan horse” programs to our computers. These emails appear to be legitimate emails but direct recipients to fake websites operated by the sender of the email or request that the recipient send a password or other confidential information through email or download malware. Despite our efforts to mitigate “spoof” and “phishing” emails through policies and education, “spoof” and “phishing” activities remain a serious problem that may damage our information technology infrastructure.

We hold a minority equity investment in PetroTal Corp. ("PetroTal"), and our inability, or limited ability, to control the operations or management of PetroTal may result in our receiving or retaining less than the amount of benefit we expect

We hold a minority equity investment in PetroTal and our Chief Executive Officer and Chief Financial Officer serve on the board of directors of PetroTal. Even though we are able to exercise influence as a minority equity investor in PetroTal, our influence of PetroTal is limited. As a result, we may be unable to implement or influence PetroTal’s business plan, assure quality control, or set the timing and pace of development. Our inability, or limited ability, to control the operations or management of PetroTal may result in us receiving or retaining less than the amount of benefit we might otherwise expect to receive from such investment. We may also be unable, or limited in our ability, to cause PetroTal to effect significant transactions such as large expenditures or contractual commitments, the development of properties, the construction or acquisition of assets or the borrowing of money. Serving on the board of directors by our two senior executive officers will require time commitment and could expose them to liability in such role. If PetroTal or its board of directors were to experience events that exposed them to liability or reputational harm, it could have an adverse effect on us or our senior executives, including a decline in the market price of our equity securities. We may also be limited in our ability to monetize or exit our investment in PetroTal given the limited trading market for its equity securities. Subsequent to December 31, 2020, we sold 44% percent of our interest in PetroTal with the remaining investment representing 17% of PetroTal's issued and outstanding common shares.

Risks Related to our Financial Condition

Our business requires significant capital expenditures, and we may not have the resources necessary to fund these expenditures

Our base capital program for 2021 is $130.0 million to $150.0 million for exploration and development based on a mid-point range for budgeted exploration costs. We expect to finance our 2021 capital program primarily through cash flows from

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operations. Funding this program from cash flows from operations relies in part on Brent oil prices being at least $49.0 per barrel or greater. For the period from January 1 to February 19, 2021, the average price of Brent oil was $57.8 per barrel.

If cash flows from operations, cash on hand and available capacity under our credit facility are not sufficient to fund our capital program, we may be required to seek external financing or to delay or reduce our exploration and development activities, which could impact production, revenues and reserves.

If we require additional capital, we may pursue sources of capital through various financing transactions or arrangements, including joint venturing of projects, debt financing, equity financing or other means. We may not be able to access capital on favorable terms or at all. If we do succeed in raising additional capital, future financings may be dilutive to our shareholders, as we could issue additional shares of common stock or other equity to investors. In addition, debt and other mezzanine financing may involve a pledge of assets, require covenants that would restrict our business activities, and may be senior to interests of equity holders. We may incur substantial costs in pursuing future capital financing, including investment banking fees, legal fees and other costs. We may also be required to recognize non-cash expenses in connection with certain securities we may issue, such as convertibles and warrants, which would adversely impact our financial results.

Our ability to obtain needed financing may be impaired by factors such as weak capital markets (both generally and for the oil and gas industry in particular), the location of our oil and natural gas properties, including in Colombia and Ecuador, low or declining prices of oil and natural gas on the commodities markets, and the loss of key management. Further, if oil or natural gas prices on the commodities markets decrease, then our revenues will likely decrease, and such decreased revenues may increase our requirements for capital. Some of the contractual arrangements governing our exploration activity may require us to commit to certain capital expenditures, and we may lose our contract rights if we do not have the required capital to fulfill these commitments. If the amount of capital we are able to raise from financing activities, together with our cash flows from operations, is not sufficient to satisfy our capital needs (even to the extent that we reduce our activities), we may be required to curtail our operations.

The borrowing base under our revolving credit facility may be reduced by the lenders, which could prevent us from meeting our future capital needs

The borrowing base under our revolving credit facility is currently $215 million, of which $200 million is readily available for borrowing and $15 million is subject to approval by majority lenders. Our borrowing base is redetermined by the lenders twice per year, with the next re-determination to occur no later than May 2021. Our borrowing base may decrease as a result of a decline in oil or natural gas prices, operating difficulties, declines in reserves, lending requirements or regulations, lenders willingness to lend to the oil and gas industry, the issuance of new indebtedness or for any other reason. We cannot be certain that funding will be available if needed, and to the extent required, on acceptable terms. In the event of a decrease in our borrowing base, we could be required to repay any indebtedness in excess of the redetermined borrowing base, which would deplete cash flow from operations or require additional financing.

Further, our borrowing base is made available to us subject to the terms and covenants of our revolving credit facility, including compliance with the ratios and other financial covenants of such facility, and a failure to comply with such ratios or covenants could force us to repay a portion of our borrowings and suffer adverse financial impacts. Management has obtained a relief from compliance with certain financial covenants until October 1, 2021 ("the covenant relief period"), permitting the ratio of total debt to Covenant EBITDAX ("EBITDAX") to be greater than 4.0 to 1.0, Senior Secured Debt to EBITDAX ratio must not exceed 2.5 to 1.0, and EBITDAX to interest expense ratio for the trailing four quarter periods measured as of the last day of the fiscal quarters ending (i) December 31, 2020 and March 31, 2021, must be at least 1.5 to 1.0 (ii) June 30, 2021 and September 30, 2021 must be at least 2.0 to 1.0, and be at least 2.5 to 1.0 thereafter. We are required to comply with various covenants, which as disclosed above, have been modified in response to the current market conditions and the COVID-19 pandemic. After the expiration of covenant relief period, we must maintain compliance with the following financial covenants: limitations on Company's ratio of debt to EBITDAX to a maximum of 4.0 to 1.0; limitations on Company's ratio of Senior Secured Debt to EBITDAX to a maximum of 3.0 to 1.0; and the maintenance of a ratio of EBITDAX to interest expense of at least 2.5 to 1.0.

If we fail to comply with these financial covenants, it would result in a default under the terms of the credit agreement, which could result in an acceleration of repayment of all indebtedness under our revolving credit facility. An event of default under the revolving credit facility would result in a default under the indentures governing our senior notes, which could allow the note holders to require us to repurchase all of our outstanding senior notes. Based on the Brent price and production levels used in

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2021 outlook, management expects to be in compliance with the financial covenants contained in the credit facility agreement after the expiry of covenant relief period.

Foreign currency exchange rate volatility may affect our financial results

We sell our oil and natural gas production under agreements that are denominated mainly in U.S. dollars. Many of the operational and other expenses we incur, including current and deferred tax assets and liabilities in Colombia, are denominated in Colombian pesos. Most of our administration costs in Canada are incurred in Canadian dollars. As a result, we are exposed to translation risk when local currency financial statements are translated to U.S. dollars, our functional currency. An appreciation of local currencies can increase our costs and negatively impact our results from operations. Because our Consolidated Financial Statements are presented in U.S. dollars, we must translate revenues, expenses and income, as well as assets and liabilities, into U.S. dollars at exchange rates in effect during or at the end of each reporting period. We are also exposed to transaction risk on settlement of payables and receivables denominated in foreign currency. We also hold an equity stake in PetroTal (TSXV - TAL, AIM - PTAL) which is denominated in Canadian dollars. Changes in exchange rate impacts the value of our investment.

Legal and Regulatory Risks

We are dependent on obtaining and maintaining permits and licenses from various governmental authorities

Our oil and natural gas exploration and production operations are subject to complex and stringent laws and regulations. In order to conduct our operations in compliance with these laws and regulations, we must obtain and maintain numerous licenses, permits, approvals and certificates, including environmental and other operating permits. We may not be able to obtain, sustain or renew such licenses and permits on a timely basis or at all. We may also have licenses and permits rescinded or may not be able to renew expiring licenses and permits. Failure or delay in obtaining or maintaining regulatory approvals or permits could have a material adverse effect on our ability to develop and explore on our properties, and receipt of drilling permits with onerous conditions could increase our compliance costs. Loss of permits for existing drilling, water injection or other activities necessary for production may result in a decline of our production levels and revenues or damage to the well structure. Regulations and policies relating to these licenses and permits may change, be implemented in a way that we do not currently anticipate or take significantly greater time to obtain. There can be no assurance that future political conditions in Colombia and Ecuador will not result in changes to policies with respect to foreign development and ownership of oil, environmental protection, health and safety or labor relations, which may negatively affect our ability to undertake exploration and development activities in respect of present and future properties, as well as our ability to raise funds to further such activities.

As we are not the operator of all the joint ventures we are currently involved in, we may rely on the operator to obtain all necessary permits and licenses. If we fail to comply with these requirements, we could be prevented from drilling for oil and natural gas, and we could be subject to civil or criminal liability or fines. Revocation or suspension of our environmental and operating permits could have a material adverse effect on our business, financial condition and results of operations.

Environmental regulation and risks may adversely affect our business

Environmental regulation is stringent and the costs and expenses of regulatory compliance are increasing. All phases of the oil and natural gas business present environmental risks and hazards and are subject to environmental regulation pursuant to an extensive suite of international conventions and national and regional laws and regulations. Environmental legislation provides for, among other things, restrictions and prohibitions on spills, releases or emissions of various substances used or produced in association with oil and gas operations. The legislation also requires that wells and facility sites be operated, maintained, abandoned and reclaimed to the satisfaction of applicable regulatory authorities. Compliance with such legislation can require significant expenditures. Failure to comply with these laws and regulations may result in the suspension or termination of operations and subject us to administrative, civil and criminal fines and penalties. Our operations create the risk of significant environmental liabilities to the government or third parties for any unlawful discharge of oil, gas or other pollutants into the air, soil or water or for certain other environmental impacts. There is uncertainty around the impact of environmental laws and regulations, including those presently in force and those expected to be proposed in the future. We cannot predict how future environmental laws will be interpreted, administered or enforced, but more stringent laws or regulations or more vigorous enforcement policies could in the future require material expenditures by us for the installation and operation of compliant systems; therefore it is impossible at this time to predict the nature and impact of those requirements on our company however they may have a material adverse impact on our business.

Given the nature of our business, there are inherent risks of oil spills at drilling or operations sites due to operational failure, accidents, sabotage, pipeline failure or tampering or escape of oil due to the transportation of the oil by truck. All of these may

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lead to significant potential environmental liabilities, such as damages, litigation costs, clean-up costs or penalties, some of which may be material and for which our insurance coverage maybe inadequate or unavailable.

We may be exposed to liabilities under anti-bribery laws and a finding that we violated these laws could have a material adverse effect on our business

We are subject to anti-bribery laws in the United States, Canada, Ecuador and Colombia and will be subject to similar laws in other jurisdictions where we may operate in the future. We may face, directly or indirectly, corrupt demands by officials, tribal or insurgent organizations, international organizations, or private entities. As a result, we face the risk of unauthorized payments or offers of payments by employees, contractors, agents, and partners of ours or our subsidiaries or affiliates, given that these parties are not always subject to our control or direction. It is our policy to prohibit these practices. However, our existing safeguards and any future improvements to those measures may prove to be less than effective or may not be followed, and our employees, contractors, agents, and partners may engage in illegal conduct for which we might be held responsible. A violation of any of these laws, even if prohibited by our policies, may result in criminal or civil sanctions or other penalties (including profit disgorgement) as well as reputational damage and could have a material adverse effect on our business and financial condition.

If the United States imposes sanctions on Colombia or Ecuador in the future, our business may be adversely affected

Colombia is among several nations whose eligibility to receive foreign aid from the United States is dependent on its progress in stemming the production and transit of illegal drugs, which is subject to an annual review by the President of the United States. Although Colombia is currently eligible for such aid, Colombia may not remain eligible in the future. A finding by the President that Colombia has failed demonstrably to meet its obligations under international counter-narcotic agreements may result in the imposition of economic and trade sanctions on Colombia which could result in adverse economic consequences in Colombia including potentially threatening our ability to obtain necessary financing to develop our Colombian properties, and could further heighten the political and economic risks associated with our operations there.

Regulations related to emissions and the impact of any changes in climate could adversely impact our business

Governments around the world have become increasingly focused on regulating greenhouse gas (“GHG”) emissions and addressing the impacts of climate change in some manner. GHG emissions legislation is emerging and is subject to change. For example, on an international level, in December 2015, almost 200 nations, including Colombia, agreed to an international climate change agreement in Paris, France (the “Paris Agreement”), that calls for countries to set their own GHG emission targets and be transparent about the measures each country will use to achieve its GHG emission targets. Although it is not possible at this time to predict how this legislation or any new regulations that may be adopted to address GHG emissions would impact our business, any such future laws and regulations that limit emissions of GHGs could adversely affect demand for the oil and natural gas that we produce.

Current GHG emissions legislation has not resulted in material compliance costs; however, it is not possible at this time to predict whether proposed legislation or regulations will be adopted, and any such future laws and regulations could result in additional compliance costs or additional operating restrictions. If we are unable to recover a significant amount of our costs related to complying with climate change regulatory requirements imposed on us, it could have a material adverse impact on our business, financial condition and results of operations. Significant restrictions on GHG emissions could result in decreased demand for the oil that we produce, with a resulting decrease in the value of our reserves. Further, there have been efforts in recent years to influence the investment community to consider climate change in how they invest in companies. To the extent financial markets view climate change and GHG emissions as a financial risk; this could negatively impact our cost of or access to capital. Increasing attention to the risks of climate change has resulted in an increased possibility of lawsuits brought by public and private entities against oil and natural gas companies in connection with their GHG emissions. Should we be targeted by any such litigation, we may incur liability, which, to the extent that societal pressures or political or other factors are involved, could be imposed without regard to the company's causation of or contribution to the asserted damage, or to other mitigating factors. Finally, although we strive to operate our business operations to accommodate expected climatic conditions, to the extent there are significant changes in the Earth’s climate, such as more severe or frequent weather conditions in the markets we serve or the areas where our assets reside, we could incur increased expenses, our operations could be materially impacted, and demand for our products could fall.

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Risks Related to Ownership of our Common Stock

Shares of our Common Stock are listed on the NYSE American, the TSX and the London Stock Exchange ("LSE") and investors seeking to take advantage of price differences between such markets may create unexpected volatility in market prices

Shares of our Common Stock are listed on the NYSE American, the TSX and the LSE. While the Common Stock is traded on such markets, the price and volume levels could fluctuate significantly on any market independently of the price or trading volume on other markets. Investors could seek to sell or purchase shares of Common Stock to take advantage of any price differences between the NYSE American, the TSX and the LSE through a practice referred to as arbitrage. Any arbitrage activity could create unexpected volatility in the price of the Common Stock on any of these exchanges or the volume of Common Stock available for trading on any of these markets. In addition, shareholders in any of these jurisdictions will not be able to transfer such shares of Common Stock for trading on another market without effecting necessary procedures with our transfer agent or registrar. This could result in time delays and additional cost for shareholders of the Common Stock.

If we cannot meet the NYSE American continued listing requirements, the NYSE may delist our shares of Common Stock

Our shares of Common Stock are currently listed on the NYSE American, and the continued listing of our shares is subject to our compliance with a number of listing standards. If we fail to maintain compliance with these continued listing standards, including if the price our shares of Common Stock remains at its current low for a substantial period of time and we fail to effect a reverse stock split upon notice from the NYSE, our shares of Common Stock may be delisted. A delisting of our shares could negatively impact us by, among other things reducing the liquidity of our shares and limiting our ability to issue additional securities, obtain additional financing or pursuant strategic transactions.

For as long as we are a smaller reporting company, we will not be required to comply with certain disclosure requirements that apply to other public companies

We are currently a “smaller reporting company” as defined by Rule 12b-2 of the Exchange Act. “Smaller reporting companies”, are able to provide simplified executive compensation disclosures in their filings, and have certain other scaled disclosure obligations in their SEC filings, including, among other things, being required to provide only two years of audited financial statements in annual reports. The scaled disclosures we provide in our SEC filings due to our status as a “smaller reporting company” may make it harder for investors to analyze our results of operations and financial prospects. If some investors find our common stock to be less attractive as a result of the scaled disclosures, there also may be a less active trading market for our common stock and our trading price may be more volatile.

Item 1B. Unresolved Staff Comments

None.

Item 3. Legal Proceedings

We are engaged in discussions with the ANH regarding the interpretation of whether certain transportation and related costs are eligible to be deducted in the calculation of the HPR royalty. Discussions with the ANH are ongoing. Although the outcome of these discussions cannot be predicted with certainty, we believe the resolution of these matters would not have a material adverse effect on the Company’s consolidated financial position, results of operations or cash flows. The costs are recorded as they incurred or become probable and determinable.

We have several other lawsuits and claims pending. Although the outcome of these lawsuits and disputes cannot be predicted with certainty, we believe the resolution of these matters would not have a material adverse effect on our consolidated financial position, results of operations or cash flows. We record costs as they are incurred or become probable and determinable.

Item 4. Mine Safety Disclosures

Not applicable.

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Information About Our Executive Officers

Set forth below is information regarding our executive officers as of February 19, 2021.

Name	Age	Position
Gary S. Guidry	65	President and Chief Executive Officer, Director
Ryan Ellson	45	Chief Financial Officer and Executive Vice President, Finance
James Evans	55	Vice President, Corporate Services
Glen Mah	64	Vice President, Exploration Ecuador
Rodger Trimble	59	Vice President, Investor Relations
Lawrence West	64	Vice President, Exploration

•Gary S. Guidry, President and Chief Executive Officer, Director. Mr. Guidry has been Gran Tierra's Chief Executive Officer and President since May 7, 2015. From July 2011 to July 2014, Mr. Guidry served as President and Chief Executive Officer of Caracal Energy Inc. Mr. Guidry also served as President and CEO of Orion Oil & Gas Corp. from October 2009 to July 2011, Tanganyika Oil Corp. from May 2005 to January 2009, and Calpine Natural Gas Trust from October 2003 to February 2005. As Chief Executive Officer of these companies, Mr. Guidry was responsible for overseeing all aspects of the respective company’s business. Mr. Guidry currently sits on the board of Africa Oil Corp. (since April 2008) where he also serves as a member of the Audit Committee and the board of PetroTal Corp. (since December 2017). From September 2010 to October 2011, Mr. Guidry served on the board of Zodiac Exploration Corp., from October 2009 to March 2014, he served on the board of TransGlobe Energy Corp., and from February 2007 to May 2018, he served on the board of Shamaran Petroleum Corp. Prior to these positions, Mr. Guidry served as Senior Vice President and subsequently President of Alberta Energy Company International, and President and General Manager of Canadian Occidental Petroleum’s Nigerian operations. Mr. Guidry has directed exploration and production operations in Yemen, Syria and Egypt and has worked for oil and gas companies around the world in the U.S., Colombia, Ecuador, Venezuela, Argentina and Oman. Mr. Guidry is an Alberta-registered professional engineer (P. Eng.) and holds a B.Sc. in petroleum engineering from Texas A&M University.

•Ryan Ellson, Chief Financial Officer and Executive Vice President, Finance. Mr. Ellson has been Gran Tierra's Chief Financial Officer since May 2015. Mr. Ellson has over 21 years of experience in a broad range of international corporate finance and accounting roles. Mr. Ellson is currently a Director of PetroTal Corp. (since December 2017). From July 2014 until December 2014 Mr. Ellson was Head of Finance for Glencore E&P (Canada) Inc. and prior thereto Vice President, Finance at Caracal Energy Inc., a London Stock Exchange ("LSE") listed company with operations in Chad, Africa from August 2011 until July 2014. Glencore E&P (Canada) purchased Caracal in July 2014. Prior to Caracal, Mr. Ellson was Vice President of Finance at Sea Dragon Energy from April 2010 until August 2011. In these positions, Mr. Ellson oversaw financial and accounting functions, implemented and oversaw internal financial controls, secured reserve based lending facility's and was involved in multiple capital raises. Mr. Ellson has held management and executive positions with companies operating in Chad, Egypt, India and Canada. Mr. Ellson is a Chartered Professional Accountant and holds a Bachelor of Commerce and a Master of Professional Accounting from the University of Saskatchewan. Mr. Ellson has completed the Leadership for Senior Executives program at Harvard Business School and several executive education programs at The Wharton School of the University of Pennsylvania.

•James Evans, Vice President, Corporate Services. Mr. Evans has been Gran Tierra's Vice President, Corporate Services, since May 2015. Mr. Evans has over 27 years of experience including working the last 16 years in the international oil and gas industry. Most recently, Mr. Evans was the Head of Compliance & Corporate Services for Glencore E&P (Canada) Inc. from July 2014 to December 2014, and prior thereto Vice President of Compliance & Corporate Services at Caracal Energy Inc. from July 2011 to June 2014 where he oversaw the execution of corporate strategy and goals, developed and implemented a robust corporate compliance program, and managed all aspects of IT, document control, security and administration. Mr. Evans also managed the recruitment, training and retention of staff in both Calgary and Chad. He oversaw the growth of Caracal Energy from seven employees to more than 400 at the time of sale to Glencore. Prior to Caracal, Mr. Evans held senior management and executive positions at Orion Oil and Gas and Tanganyika Oil, with operating experience in Egypt, Syria and Canada. Mr. Evans holds a Bachelor of Commerce degree from the University of Calgary.

•Glen Mah, Vice President, Exploration Ecuador. Mr. Mah was appointed as Vice President, Explorations Ecuador in September 2019 and has been Gran Tierra's Vice President, Business Development since June 2016. He is a Petroleum Geologist with extensive management experience covering the execution of exploration programs, field development and

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asset management for conventional and unconventional hydrocarbons. He has worked with onshore and offshore projects in various petroleum basins in the Americas, Africa, Middle East and Asia. Mr. Mah was the Chief Geologist with the highly successful Tanganyika Oil Company Ltd. Mr. Mah has Alberta-registered Professional designation with APEGA and holds a Bachelor of Science degree Specialization in Geology from the University of Alberta.

•Rodger Trimble, Vice President, Investor Relations. Mr. Trimble has been Gran Tierra's Vice President, Investor Relations since June 2016. He is a Professional Engineer with more than 31 years of experience in domestic and international basins in various management positions. Prior to joining Gran Tierra, Mr. Trimble was Head of Corporate Planning, Budgeting & Finance with Glencore E&P (Canada) Inc. and prior thereto Director Corporate Planning, Budget & Business Development with Caracal Energy Inc. (acquired by Glencore E&P). He has held several senior management positions ranging from Country Manager in Argentina with Canadian Hunter Exploration, Vice President, Exploitation with Esprit Energy Trust, Manager, Reservoir Engineering with Apache Canada Inc. and Manager, Upstream Evaluations - Frontiers & International with Husky Energy. Mr. Trimble is an Alberta-registered Professional Engineer and a member of APEGA. He received a Bachelor of Science in Petroleum Engineering (with Distinction) from Stanford University.

•Lawrence West, Vice President, Exploration. Mr. West has been Gran Tierra's Vice President, Exploration, since May 2015. Mr. West has over 36 years of experience as an executive, explorationist, and geologist. Most recently, Mr. West was Vice President, Exploration at Caracal Energy from July 2011 to June 2014. Mr. West built a multi-disciplinary team to assess resources and grow reserves in the interior rift basins within Chad and led a successful exploration program. During his tenure he successfully executed two large 2D/3D seismic shoots in remote frontier basins, on time and on budget. Prior to Caracal he has been involved in starting and growing several public and private companies, including Reserve Royalty Corp., Chariot Energy, Auriga Energy and Orion Oil and Gas. Lawrence worked at Alberta Energy Company (AEC), where he was on the team that merged with Conwest. He built and led the AEC East team to the Rocky Mountain USA basins. His career began with Imperial Oil working on prospect and reservoir characterization, in multi-disciplinary teams, and as a technical mentor to exploration teams. Lawrence has an Honours Bachelor of Science in Geology from McMaster University and an MBA, specializing in economics, from the University of Calgary.

PART II

Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Shares of our Common Stock trade on the NYSE American, the Toronto Stock Exchange (“TSX”) and on the London Stock Exchange (“LSE”) under the symbol “GTE”.

As of February 19, 2021, there were approximately 28 holders of record of shares of our Common Stock and 366,981,556 shares outstanding with $0.001 par value.

Dividend Policy

We have never declared or paid dividends on the shares of Common Stock and we intend to retain future earnings, if any, to support the development of the business and therefore do not anticipate paying cash dividends for the foreseeable future. Payment of future dividends, if any, would be at the discretion of our Board of Directors after taking into account various factors, including current financial condition, the tax impact of repatriating cash, operating results and current and anticipated cash needs. Under the terms of the credit facility, the Company cannot pay any dividends to its shareholders if it is in default under the facility and, if the Company is not in default, it is required to obtain bank approval for dividend payments to shareholders outside of the credit facility group which comprises the Company’s subsidiaries in Colombia, Canada and the United States of America (the “Credit Facility Group”).

Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations

This report, and in particular this Management’s Discussion and Analysis of Financial Condition and Results of Operations, contains forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. Please see the cautionary language at the very beginning of this Annual Report on Form 10-K regarding the identification of and risks relating to forward-looking statements, as well as Part I, Item 1A. “Risk Factors” in this Annual Report on Form 10-K.

The following discussion of our financial condition and results of operations should be read in conjunction with the “Financial Statements and Supplementary Data” as set out in Part II, Item 8 of this Annual Report on Form 10-K. As a smaller reporting

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company, we are not required to include information regarding fiscal year 2018 in this Item 7, including a comparison of 2019 to 2018. For this information, please read Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, in our Annual Report on Form 10-K for the year ended December 31, 2019.

Overview

We are a company focused on international oil and gas exploration and production with assets currently in Colombia and Ecuador. Our Colombian properties represented 100% of our proved reserves NAR at December 31, 2020. For the year ended December 31, 2020, 100% of our revenue was generated in Colombia (2019 - 100%). We are headquartered in Calgary, Alberta, Canada.

As of December 31, 2020, we had estimated proved reserves NAR of 65.0 MMBOE, a slight decrease of 4% from the prior year, of which 60% were proved developed reserves and 100% were oil.

Financial and Operational Highlights

Key Highlights

•Net loss in 2020 was $778.0 million or $(2.12) per share basic and diluted, which included a non-cash ceiling test and inventory impairment of $564.5 million and goodwill impairment of $102.6 million, respectively, compared to net income of $38.7 million, or $0.10 per share basic and diluted in 2019

•Loss before income taxes in 2020 was $853.4 million compared to income before income taxes of $96.0 million in 2019

•Our total 2020 average production NAR was 20,072 bopd, a decrease from 29,015 bopd in 2019. With unprecedented impact of the COVID-19 pandemic and the related crash in world oil prices, we took decisive action during the first half of 2020 to shut-in minor fields, curtail drilling activity and defer workovers in order to protect the Company's balance sheet and liquidity. In the low price environment, we made the prudent move not to maximize production but defer production to a higher price environment

•Our total 2020 oil sales volumes NAR decreased by 31% to 20,163 bopd compared to 2019

•Oil sales for 2020 decreased 58% to $237.8 million compared to $571.0 million in 2019 primarily as a result of a 33% decrease in Brent price and a 31% decrease in sales volumes

•Oil sales per bbl for 2020 were $32.23, 40% lower compared to 2019

•Adjusted EBITDA(1) for 2020 was $96.5 million compared to $329.4 million in 2019

•Funds flow from operations(1) for 2020 decreased by 83% to $45.2 million or $0.12 per share basic and diluted compared with $272.4 million or $0.72 per share basic and diluted in 2019

•Operating expenses per bbl for 2020 were $15.16, 12% lower compared to 2019 primarily due to cost saving initiatives implemented during the first half of 2020 in response to deteriorating world oil prices, and the shut-in of higher cost minor fields for a portion of 2020. The majority of the cost saving initiatives, which are expected to be maintained in 2021, represent structural improvements of the Company's operations. Total operating expenses were $111.9 million in 2020, compared to $183.2 million in 2019 representing a 39% decrease

•Quality and transportation discounts per bbl for 2020 were $10.98 compared to $10.48 in 2019. The increase was due to higher Castilla and Vasconia differentials in 2020 compared to 2019

•Transportation expenses per bbl for 2020 decreased by 26% to $1.43 compared to 2019, primarily as a result of utilization of alternative transportation routes during 2020 which had lower cost per bbl

•General and administrative ("G&A") expenses before stock-based compensation per bbl for 2020 decreased by 3% to $3.05 compared to 2019 due to headcount optimization in addition to costs saving initiatives implemented in 2020, despite a 31% decrease in production. G&A expense before stock-based compensation was $22.5 million in 2020, compared to $33.3 million in 2019 representing a 32% decrease

•Capital expenditures decreased by $283.0 million or 75% from the prior year to $96.3 million as a result of significantly reduced activity. During fourth quarter of 2020, we restarted development drilling operations at the Acordionero field and accelerated certain budgeted first half of 2021 capital expenditures into fourth quarter to maximize operational efficiencies

•In December 2020, we completed the semi-annual redetermination of our credit facility resulting in a committed borrowing base of $215.0 million with a balance outstanding of $190.0 million as at December 31, 2020

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•Through both direct tax refunds from the Colombian government and value-added tax ("VAT) on our oil sales, we collected a total of VAT and income tax receivables of $113.7 million

(Thousands of U.S. Dollars, unless otherwise noted)	Year Ended December 31,
	2020		% Change	2019
SEC Compliant Reserves, NAR (MMBOE)
Estimated proved oil and gas reserves	65		(4)	68
Estimated probable oil and gas reserves	44		(24)	58
Estimated possible oil and gas reserves	44		16	38
Average Consolidated Daily Volumes (BOPD)
Working interest ("WI") production before royalties	22,624		(35)	34,817
Royalties	(2,552)		(56)	(5,802)
Production NAR	20,072		(31)	29,015
Decrease in inventory	91		(27)	125
Sales (2)	20,163		(31)	29,140
Net (Loss) Income	$	(777,967)	(2,111)	$	38,690
Operating Netback
Oil sales	$	237,838	(58)	$	570,983
Operating expenses	(111,888)		(39)	(183,204)
Transportation expenses	(10,543)		(48)	(20,400)
Operating netback (1)	$	115,407	(69)	$	367,379
G&A Expenses Before Stock-Based Compensation	$	22,506	(32)	$	33,300
G&A Stock-Based Compensation	$	1,216	(15)	$	1,430
Adjusted EBITDA (1)	$	96,482	(71)	$	329,359
Net Cash Provided By Operating Activities	$	81,074	(54)	$	177,665
Funds Flow From Operations (1)	$	45,213	(83)	$	272,409
Capital Expenditures	$	96,281	(75)	$	379,314
Cash Paid for Acquisitions, Net of Cash Acquired	$	—	(100)	$	77,772

	As at December 31,
(Thousands of U.S. Dollars)	2020		% Change	2019
Cash and cash equivalents and current restricted cash and cash equivalents	$	14,114	60	$	8,817
Working capital surplus, including cash and cash equivalents	$	20,226	(78)	$	91,347
Revolving credit facility	$	190,000	61	$	118,000
Senior Notes	$	600,000	—	$	600,000

(1) Non-GAAP measures

Operating netback, adjusted EBITDA and funds flow from operations are non-GAAP measures which do not have any standardized meaning prescribed under GAAP. Management views these measures as financial performance measures. Investors are cautioned that these measures should not be construed as alternatives to net income or loss or other measures of financial performance as determined in accordance with GAAP. Our method of calculating these measures may differ from other companies and, accordingly, may not be comparable to similar measures used by other companies. Each non-GAAP financial measure is presented along with the corresponding GAAP measure so as not to imply that more emphasis should be placed on the non-GAAP measure.

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Operating netback, as presented, is defined as oil sales less operating and transportation expenses. Management believes that operating netback is a useful supplemental measure for management and investors to analyze financial performance and provides an indication of the results generated by our principal business activities prior to the consideration of other income and expenses. A reconciliation from oil sales to operating netback is provided in the table above.

EBITDA, as presented, is defined as net income or loss adjusted for depletion, depreciation and accretion ("DD&A") expenses, interest expense and income tax expense or recovery. Adjusted EBITDA, as presented, is defined as EBITDA adjusted for asset impairment, goodwill impairment, non-cash lease expense, lease payments, unrealized foreign exchange gains or losses, loss on redemption of Convertible Notes, unrealized gains or losses on financial instruments, other non-cash losses and stock based compensation expense. Management uses this supplemental measure to analyze performance and income generated by our principal business activities prior to the consideration of how non-cash items affect that income, and believes that this financial measure is useful supplemental information for investors to analyze our performance and our financial results. A reconciliation from net income or loss to EBITDA and adjusted EBITDA is as follows:

	Year Ended December 31,				Three Months Ended,
	December 31,				December 31,				September 30,
(Thousands of U.S. Dollars)	2020		2019		2020		2019		2020
Net (loss) income	$	(777,967)	$	38,690	$	(47,871)	$	27,004	$	(107,821)
Adjustments to reconcile net (loss) income to EBITDA and Adjusted EBITDA
DD&A expenses	164,233		225,033		33,115		60,603		31,340
Interest expense	54,140		43,268		13,936		12,613		14,029
Income tax (recovery) expense	(75,394)		57,285		(13,158)		11,610		(20,565)
EBITDA (non-GAAP)	$	(634,988)	$	364,276	$	(13,978)	$	111,830	$	(83,017)
Asset impairment	564,495		—		57,402		196		104,731
Goodwill impairment	102,581		—		—		—		—
Non-cash lease expense	1,951		1,806		457		440		523
Lease payments	(1,926)		(1,969)		(522)		(366)		(429)
Unrealized foreign exchange loss (gain)	5,271		1,803		(17,064)		(3,500)		3,080
Loss on redemption of Convertible Notes	—		11,501		—		196		—
Unrealized loss (gain) on financial instruments	55,856		(49,488)		(5,983)		(44,323)		(5,086)
Other non-cash loss	2,026		—		—		—		2,026
Stock-based compensation expense	1,216		1,430		1,923		338		56
Adjusted EBITDA (non-GAAP)	$	96,482	$	329,359	$	22,235	$	64,811	$	21,884

Funds flow from operations, as presented, is defined as net income or loss adjusted for DD&A expenses, asset impairment, goodwill impairment, deferred tax expense or recovery, stock-based compensation expense, amortization of debt issuance costs, non-cash lease expense, lease payments, unrealized foreign exchange gains or losses, financial instruments gains or losses, other non-cash losses, cash settlement of financial instruments and loss on redemption of Convertible Notes. Management uses this financial measure to analyze performance and income or loss generated by our principal business activities prior to the consideration of how non-cash items affect that income or loss, and believes that this financial measure is also useful supplemental information for investors to analyze performance and our financial results. A reconciliation from net income or loss to funds flow from operations is as follows:

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	Year Ended December 31,				Three Months Ended,
	December 31,				December 31,				September 30,
(Thousands of U.S. Dollars)	2020		2019		2020		2019		2020
Net (loss) income	$	(777,967)	$	38,690	$	(47,871)	$	27,004	$	(107,821)
Adjustments to reconcile net (loss) income to funds flow from operations
DD&A expenses	164,233		225,033		33,115		60,603		31,340
Asset impairment	564,495		—		57,402		—		104,731
Goodwill impairment	102,581		—		—		—		—
Deferred tax (recovery) expense	(76,148)		40,227		(13,352)		8,475		(21,202)
Stock-based compensation expense	1,216		1,430		1,923		338		56
Amortization of debt issuance costs	3,625		3,376		851		802		838
Non-cash lease expense	1,951		1,806		457		440		523
Lease payments	(1,926)		(1,969)		(522)		(366)		(429)
Unrealized foreign exchange loss (gain)	5,271		1,803		(17,064)		(3,500)		3,080
Other non-cash loss	2,026		—		—		—		2,026
Financial instruments loss (gain)	50,982		(46,215)		(887)		(43,325)		(713)
Cash settlement of financial instruments	4,874		(3,273)		(5,096)		(998)		(4,373)
Loss on redemption of Convertible Notes	—		11,501		—		196		—
Funds flow from operations (non-GAAP)	$	45,213	$	272,409	$	8,956	$	49,669	$	8,056

(2) Sales volumes represent production NAR adjusted for inventory changes.

Consolidated Results of Operations

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		% Change	2019
Oil sales	$	237,838	(58)	$	570,983
Operating expenses	111,888		(39)	183,204
Transportation expenses	10,543		(48)	20,400
Operating netback (1)	115,407		(69)	367,379
COVID-19 related costs	2,679		100	—
DD&A expenses	164,233		(27)	225,033
Asset impairment	564,495		100	—
Goodwill Impairment	102,581		100	—
G&A expenses before stock-based compensation	22,506		(32)	33,300
G&A stock-based compensation expense	1,216		(15)	1,430
Severance expenses	1,628		(8)	1,771
Foreign exchange loss	4,184		567	627
Financial instruments loss (gain)	50,982		210	(46,215)
Interest expense	54,140		25	43,268
	968,644		274	259,214
Other loss	(469)		(96)	(12,886)
Interest income	345		(50)	696
(Loss) income before income taxes	(853,361)		(989)	95,975
Current income tax expense	754		(96)	17,058

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Deferred income tax (recovery) expense	(76,148)		(289)	40,227
Total income tax (recovery) expense	(75,394)		(232)	57,285
Net (loss) income	$	(777,967)	(2,111)	$	38,690
Sales Volumes (NAR)
Total sales volumes, BOPD	20,163		(31)	29,140
Brent Price per bbl	$	43.21	(33)	$	64.16
Consolidated Results of Operations per bbl Sales Volumes (NAR)
Oil sales	$	32.23	(40)	$	53.68
Operating expenses	15.16		(12)	17.23
Transportation expenses	1.43		(26)	1.92
Operating netback (1)	15.64		(55)	34.53
COVID-19 related costs	0.36		100	—
DD&A expenses	22.25		5	21.16
Asset impairment	76.49		100	—
Goodwill Impairment	13.90		100	—
G&A expenses before stock-based compensation	3.05		(3)	3.13
G&A stock-based compensation expense	0.16		23	0.13
Severance expenses	0.22		29	0.17
Foreign exchange loss	0.57		850	0.06
Financial instruments loss (gain)	6.91		259	(4.35)
Interest expense	7.34		80	4.07
	131.25		439	24.37
Other loss	(0.06)		95	(1.21)
Interest income	0.05		(29)	0.07
(Loss) income before income taxes	(115.62)		(1,382)	9.02
Current income tax expense	0.10		(94)	1.60
Deferred income tax (recovery) expense	(10.32)		(373)	3.78
Total income tax (recovery) expense	(10.22)		(290)	5.38
Net (loss) income	$	(105.40)	(2,996)	$	3.64

(1) Operating netback is a non-GAAP measure which does not have any standardized meaning prescribed under GAAP. Refer to "Financial and Operational Highlights - Non-GAAP measures" for a definition and reconciliation of this measure.

Oil Production and Sales Volumes, BOPD

	Year Ended December 31,
Average Daily Volumes (BOPD)	2020		2019
WI production before royalties	22,624		34,817
Royalties	(2,552)		(5,802)
Production NAR	20,072		29,015
Decrease in inventory	91		125
Sales	20,163		29,140
Royalties, % of working interest production before royalties	11	%	17	%

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Oil production NAR for the year ended December 31, 2020 decreased 31% to 20,072 BOPD from 2019. With unprecedented impact of the COVID-19 pandemic and the related crash in world oil prices, we took decisive action during the first half of 2020 to shut-in minor fields, curtail drilling activity and defer workovers in order to protect the Company's balance sheet and liquidity. In the low price environment, we made the prudent move not to maximize production but defer production to a higher price environment. In addition, we experienced force majeure related to local farmers blockade which resulted in shut-in of production at the Suroriente and PUT-7 Blocks for the first half of 2020.

Royalties as a percentage of production for the year ended December 31, 2020, decreased compared to prior year commensurate with the decrease in benchmark oil prices and the price sensitive royalty regime in Colombia.

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The Midas Block includes Acordionero, Mochuelo and Ayombero-Chuira fields and the Chaza Block includes Costayaco and Moqueta fields.

Oil Sales

Oil sales for the year ended December 31, 2020, decreased by 58% to $237.8 million compared to $571.0 million in 2019, primarily as a result of a 33% decrease in Brent price and lower production volumes.

The following table shows the effect of changes in realized price and sales volumes on our oil sales for the two years ended December 31, 2020:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Oil sales for the comparative period	$	570,983	$	613,431
Realized sales price decrease effect	(158,334)		(51,485)
Sales volume (decrease) increase effect	(174,811)		9,037
Oil sales for the current period	$	237,838	$	570,983

On a per bbl basis, average realized prices decreased by 40% to $32.23 for the year ended December 31, 2020 compared to $53.68 in 2019, primarily as a result of the decrease in benchmark oil prices and higher Castilla and Vasconia differentials in 2020. In 2020 Castilla and Vasconia differentials per bbl averaged $6.79 and $4.31 respectively, compared to $5.64 and $2.54 respectively, in 2019.

Transportation Expenses

We have options to sell our oil through multiple pipelines and trucking routes. Each transportation route has varying effects on realized price and transportation expenses. The following table shows the percentage of oil volumes we sold in Colombia using each transportation method for each of the two years ended December 31, 2020:

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	Year Ended December 31,
	2020		2019
Volume transported through pipelines	4	%	1	%
Volume sold at wellhead	48	%	51	%
Volume transported via truck to pipelines	48	%	48	%
	100	%	100	%

Volumes transported through pipelines or via truck receive a higher realized price, but incur higher transportation expenses. Volumes sold at the wellhead have the opposite effect of lower realized price, offset by lower transportation expense. We focus on maximizing operating netback per bbl when choosing a transportation method.

Transportation expenses for the year ended December 31, 2020, decreased by 48% to $10.5 million, compared with $20.4 million in 2019, as a result of lower sales volumes and the utilization of alternative transportation routes during 2020. On a per bbl basis, transportation expenses decreased 26% to $1.43, from $1.92 in 2019. The decrease in transportation expenses per bbl was as a result of utilization of alternative transportation routes during 2020 which had lower cost per bbl compared to the corresponding period in 2019.

The following table shows the variance in our average realized price net of transportation expenses in Colombia for each of the two years ended December 31, 2020:

	Year Ended December 31,
(U.S. Dollars per bbl Sales Volumes NAR)	2020		2019
Average realized price net of transportation expenses for the comparative period	$	51.76	$	55.76
Decrease in benchmark prices	(20.95)		(7.53)
(Increase) decrease in quality and transportation discounts	(0.50)		2.68
Decrease in transportation expense	0.49		0.85
Average realized price net of transportation expenses for the year	$	30.80	$	51.76

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Operating Expenses

Operating expenses for the year ended December 31, 2020, decreased by 39% to $111.9 million compared to $183.2 million in 2019. On a per bbl basis, operating expenses decreased by $2.07 to $15.16 compared to $17.23 in the prior year, primarily due to cost saving initiatives implemented during the first half of 2020 in response to deteriorating world oil prices, and the shut-in of higher cost minor fields for a portion of 2020. The majority of the cost saving initiatives, which are expected to be maintained in 2021, represent structural improvements of the Company's operations. By the end of fourth quarter of 2020, we resumed development activities throughout our portfolio at much lower cost, including the ongoing workover operations and restart of development drilling at Acordionero, the restart of workover operations at Costayaco, and the restart of previously shut-in minor fields.

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Operating Netbacks

	Year Ended December 31,
Consolidated	2020		2019
(Thousands of U.S. Dollars)
Oil sales	$	237,838	$	570,983
Transportation expenses	(10,543)		(20,400)
	227,295		550,583
Operating expenses	(111,888)		(183,204)
Operating netback (1)	$	115,407	$	367,379
(U.S. Dollars per bbl Sales Volumes NAR)
Brent	$	43.21	$	64.16
Quality and transportation discounts	(10.98)		(10.48)
Average realized price	32.23		53.68
Transportation expenses	(1.43)		(1.92)
Average realized price net of transportation expenses	30.80		51.76
Operating expenses	(15.16)		(17.23)
Operating netback (1)	$	15.64	$	34.53

(1) Operating netback is a non-GAAP measure which does not have any standardized meaning prescribed under GAAP. Refer to "Financial and Operational Highlights - Non-GAAP measures" for a definition and reconciliation of this measure.

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COVID-19 Related Costs

The COVID-19 pandemic resulted in extra operating and transportation costs related to COVID-19 health and safety preventative measures including incremental sanitation requirements and enhanced procedures for trucking barrels and crew changes in the field. For the year ended December 31, 2020, COVID-19 costs were $2.5 million relating to operating activities and $0.2 million to transportation activities. There were no COVID-19 related costs in 2019.

DD&A Expenses

	Year Ended December 31,
	2020		2019
DD&A Expenses, Thousands of U.S. Dollars	$	164,233	$	225,033
DD&A Expenses, U.S. Dollars per bbl	$	22.25	$	21.16

DD&A expenses for the year ended December 31, 2020, decreased by 27%, and increased by 5% on a per bbl from 2019. On a per bbl basis, the DD&A increase in 2020 was due to a proportionally higher decrease in production, compared to the decrease in overall DD&A expense, when compared to 2019.

Asset Impairment

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Impairment of oil and gas properties	$	560,344	$	—
Impairment of inventory	4,151		—
	$	564,495	$	—

We follow the full cost method of accounting for our oil and gas properties. Under this method, the net book value of properties on a country-by-country basis, less related deferred income taxes, may not exceed a calculated “ceiling”. The ceiling is the estimated after tax future net revenues from proved oil and gas properties, discounted at 10% per year. In calculating discounted

39

future net revenues, oil and natural gas prices are determined using the average price during the 12-month period prior to the ending date of the period covered by the balance sheet, calculated as an unweighted arithmetic average of the first-day-of-the month price for each month within such period for that oil and natural gas. That average price is then held constant, except for changes which are fixed and determinable by existing contracts. Therefore, ceiling test estimates are based on historical prices discounted at 10% per year and it should not be assumed that estimates of future net revenues represent the fair market value of our reserves.

For the year ended December 31, 2020, $560.3 million ceiling test impairment was recorded in our Colombia cost center. In accordance with GAAP, we used an average Brent price of $43.43 per bbl less corresponding differentials for the purpose of the December 31, 2020 ceiling test calculation (2019 - $64.20). For the year ended December 31, 2019, no ceiling test impairment was recorded.

For the year ended December 31, 2020, we recorded $4.2 million relating to the impairment of oil inventory due to the decline in commodity pricing. There was no inventory impairment for the year ended December 31, 2019.

Goodwill Impairment

For the year ended December 31, 2020, we recorded $102.6 million of goodwill impairment relating to our Colombia business unit. The impairment was due to the carrying value of the unit exceeding its fair value as a result of the cumulative impact of the shut-in of higher cost production fields and lower forecasted commodity prices. The estimated fair value of the Colombia unit for the goodwill impairment test was based on the discounted after-tax cash flows associated with the proved and probable reserves of the reporting unit. Our goodwill consisted entirely of $102.6 million relating to the Solana Resources Limited and Argosy Energy International L.P. acquisitions in 2008 and 2006, respectively. There was no goodwill impairment for the year ended December 31, 2019.

G&A Expenses

(Thousands of U.S. Dollars)	Year Ended December 31,
	2020		% change	2019
G&A expenses before stock-based compensation	$	22,506	(32)	$	33,300
G&A stock-based compensation	1,216		(15)	1,430
G&A expenses, including stock-based compensation	$	23,722	(32)	$	34,730
(U.S. Dollars Per bbl Sales Volumes NAR)
G&A expenses before stock-based compensation	$	3.05	(3)	$	3.13
G&A stock-based compensation	0.16		23	0.13
G&A expenses, including stock-based compensation	$	3.21	(2)	$	3.26

G&A expenses before stock-based compensation for the year ended December 31, 2020 decreased 32% compared to 2019 due to headcount optimization and cost saving measures implemented in 2020. On a per bbl basis, G&A expenses before stock-based compensation decreased 3% to $3.05 compared to 2019, despite a 31% decrease in production.

G&A expenses after stock-based compensation for the year ended December 31, 2020 decreased 32% for the same reason mentioned above, as well as lower stock based compensation as a result of lower share price compared to 2019. On a per bbl basis G&A expenses after stock based compensation were lower compared to prior year at $3.21, consistent with 31% lower production.

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Severance Expenses

For the years ended December 31, 2020 and 2019, severance expenses were $1.6 million and $1.8 million, respectively, due to headcount optimization.

Foreign Exchange Losses

For the years ended December 31, 2020 and 2019, we had foreign exchange losses of $4.2 million and $0.6 million, respectively. The main sources of the foreign exchange losses are revaluation of investment in PetroTal shares, taxes receivable and payable, and deferred tax assets and liabilities. Under GAAP, investment, income taxes and deferred taxes are considered a monetary assets and liabilities and require translation from local currency to U.S. dollar functional currency at each balance sheet date.

The following table presents the change in the Colombian peso and Canadian dollar against the U.S. dollar for the last two years ended December 31, 2020 and 2019:

	Year Ended December 31,
	2020		2019
Change in the Colombian peso against the U.S. dollar	weakened by		weakened by
	5	%	1	%
Change in the Canadian dollar against the U.S. dollar	strengthened by		strengthened by
	2	%	5	%

Financial Instruments Gains or Losses

The following table presents the nature of our financial instruments gains or losses for the last two years ended December 31:

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	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Commodity price derivative (gain) loss	$	(220)	$	3,642
Foreign currency derivative loss	3,155		27
Investment loss (gain)	46,883		(49,884)
Financial instruments loss	1,164		—
	$	50,982	$	(46,215)

For the year ended December 31, 2020, we had an unrealized investment loss of $46.9 million (2019 - unrealized investment gain of $49.9 million) on our investment in PetroTal. On January 21, 2021, we disposed 44% of our interest in PetroTal for a cash consideration of $14.8 million and incurred loss on sale of $5.1 million.

Income Tax Expense and Recovery

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020			2019
(Loss) income before income taxes	$	(853,361)		$	95,975
Current income tax expense	$	754		$	17,058
Deferred income tax (recovery) expense	(76,148)			40,227
Total income tax (recovery) expense	$	(75,394)		$	57,285
Effective tax rate	9		%	60		%

Current income tax expense decreased for the year ended December 31, 2020, compared to 2019, primarily as a result of lower taxable income in Colombia.

The deferred income tax recovery for the year ended December 31, 2020, of $76.1 million was mainly a result of an impairment write-down in Colombia, which was partially offset by Colombian tax losses that are now fully offset by a valuation allowance. The deferred income tax expense for the year ended December 31, 2019, of $40.2 million was primarily a result of excess tax depreciation compared to accounting depreciation in Colombia.

Our effective tax rate was 9% for the year ended December 31, 2020, compared with 60% in 2019. The decrease in the effective tax rate was primarily due to an increase in valuation allowance, increase in foreign currency translation adjustment, goodwill impairment, and impact of foreign taxes.

The difference between our effective tax rate of 9% for the year ended December 31, 2020, and the 32% Colombian statutory rate was primarily due to an increase in the valuation allowance, foreign currency translation adjustment, non-deductible goodwill impairment, and impact of foreign taxes.

The difference between our effective tax rate of 60% for the year ended December 31, 2019, and the 33% Colombian statutory rate was primarily due to an increase in foreign currency translation adjustments, impact of foreign taxes, other permanent differences, valuation allowance and non-deductible third party royalties in Colombia. These are partially offset by a non-taxable investment gain.

Our estimated tax pools at December 31, 2020, are as follows:

(Thousands of U.S. Dollars)	2020
Colombia
Non-capital losses and other tax credits	$	252,032
Depletable and depreciable assets	902,519
Total tax pools and credits	$	1,154,551

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Net Income (Loss) and Funds Flow From Operations (a Non-GAAP Measure)

(Thousands of U.S. Dollars)	Fourth quarter 2020 compared with third quarter 2020		% change		Fourth quarter 2020 compared with fourth quarter 2019		% change		Year ended December 31, 2020 compared with year ended December 31, 2019		% change
Net (loss) income for the comparative period	$	(107,821)			$	27,004			$	38,690
Increase (decrease) due to:
Sales volumes	7,617				(38,147)				(174,811)
Prices	4,034				(24,994)				(158,334)
Expenses:
Cash operating expenses	(6,494)				21,845				71,316
Transportation	(708)				2,239				9,857
COVID-19 related costs	(42)				(1,150)				(2,679)
Cash G&A, excluding stock-based compensation expense	(817)				3,195				10,794
Severance	(37)				530				143
Interest, net of amortization of debt issuance costs	106				(1,274)				(10,623)
Realized foreign exchange gain (loss)	41				(2,608)				(89)
Settlement of financial instruments	(723)				(4,098)				8,147
Other (loss) gain	(2,361)				983				2,942
Current taxes	443				2,941				16,304
Net lease payments	(159)				(139)				188
Interest income	—				(36)				(351)
Net change in funds flow from operations (1) from comparative period	900				(40,713)				(227,196)
Expenses:
Depletion, depreciation and accretion	(1,775)				27,488				60,800
Goodwill impairment	—				—				(102,581)
Asset impairment	47,329				(57,402)				(564,495)
Deferred tax	(7,850)				21,827				116,375
Amortization of debt issuance costs	(13)				(49)				(249)
Loss on convertible notes	—				196				11,501
Net lease payments	159				139				(188)
Stock-based compensation	(1,867)				(1,585)				214
Other non-cash gain (loss)	2,026				—				(2,026)
Financial instruments gain (loss), net of financial instruments settlements	897				(38,340)				(105,344)
Unrealized foreign exchange	20,144				13,564				(3,468)
Net change in net loss	59,950				(74,875)				(816,657)
Net loss for the current period	$	(47,871)	56	%	$	(47,871)	(277)	%	$	(777,967)	(2,111)	%

(1) Funds flow from operations is a non-GAAP measure which does not have any standardized meaning prescribed under GAAP. Refer to "Financial and Operational Highlights - Non-GAAP measures" for a definition and reconciliation of this measure.

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2021 Work Program and Capital Expenditures

Our Colombian operation, which represents 100% of our production, is expected to represent 98% of our 2021 capital budget with the remainder allocated to exploration activities in Ecuador.

The table below shows the break-down of our 2021 capital program:

	Number of Wells (Gross)	Number of Wells (Net)	2021 Capital Budget ($ million)
Colombia
Development	14-18	14-18	118-138
Exploration	—	—	9
Ecuador
Exploration	—	—	3
	14-18	14-18	130-150

Our base capital program for 2021 is $130 million to $150 million for exploration and development based on a mid-point range for budgeted exploration costs. Based on the mid-point of the 2021 guidance, the capital budget is forecasted to be approximately 91% directed to development and 9% to exploration activities. Approximately 21% of the development activities included in the 2021 capital program are expected to be directed to facilities.

We expect our 2021 capital program to be fully funded by cash flows from operations. Funding this program from cash flow from operations relies in part on Brent oil prices being at least $49 per bbl for 2021.

Capital Program

Capital expenditures during the year ended December 31, 2020, were $96.3 million.

During the year ended December 31, 2020, we spud the following wells in Colombia:

	Number of Wells (Gross and Net)
Development	7.0
Service	1.0
Total	8.0

We spud one service, and 7 development wells in 2020. All of the wells were in the Midas Block.

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Liquidity and Capital Resources

	As at December 31,
(Thousands of U.S. Dollars)	2020		% Change	2019
Cash and cash equivalents	$	13,687	65	$	8,301
Current restricted cash and cash equivalents	$	427	(17)	$	516
Working capital surplus, including cash and cash equivalents	$	20,226	(78)	$	91,347
Revolving credit facility	$	190,000	61	$	118,000
Senior Notes	$	600,000	—	$	600,000

The outbreak of the COVID-19 virus, which was declared a pandemic by the World Health Organization, has spread across the globe and impacted worldwide economic activity. In addition, global commodity prices declined significantly due to disputes between major oil producing countries combined with the impact of the COVID-19 pandemic and associated reductions in global demand for oil. Governments worldwide, including those in Colombia and Ecuador, the countries where we operate, enacted emergency measures to combat the spread of the virus. These measures, which include the implementation of travel bans, self-imposed quarantine periods and social distancing, have caused, and may continue to cause, material disruption to businesses globally resulting in an economic slowdown. Governments and central banks have reacted with significant monetary and fiscal interventions designed to stabilize economic conditions however the success of these interventions is not currently determinable. The current challenging economic climate is having and may continue to have significant adverse impacts on our Company including, but not exclusively:

•material declines in revenue and cash flows as a result of the decline in commodity prices;

•declines in revenue and operating activities due to reduced capital programs and the shut-in of production;

•impairment charges;

•inability to comply with covenants and restrictions in debt agreements;

•inability to access financing sources;

•increased risk of non-performance by our customers and suppliers;

•interruptions in operations as we adjust personnel to the dynamic environment; and

•inability to operate or delay in operations as a result COVID-19 restrictions in the countries in which we operate

The unprecedented decline in oil prices has materially reduced our forecasted EBITDAX and the estimated value of our oil reserves. Based on current forecasted Brent pricing and production levels, which can change materially in very short time frames, we forecasted to be in compliance with the amended financial covenants contained in Senior Secured Credit Facility ("the revolving credit facility") for at least the next year from the date of these financial statements. The amount available under the revolving credit facility is based on the lenders determination of the borrowing base. The borrowing base is determined, by the lenders, based on our reserves and commodity prices. The next renewal of the borrowing base is scheduled for May 2021 and there is risk that the borrowing base may be reduced by the lenders. In addition, our ability to borrow under the credit facility may be limited by the terms of the indentures for the 6.25% Senior Notes and 7.75% Senior Notes.

The risk of non-compliance with the covenants in the lending agreements and the risk associated with maintaining the borrowing base is heightened in the current period of volatility coupled with the unprecedented disruption caused by the COVID-19 pandemic. Management currently expects that we will continue to meet the terms of the revolving credit facility or obtain further amendments or waivers if and when required. We also expect to be able to maintain the borrowing base at a level in excess of the amount borrowed. However, there can be no assurances that our liquidity can be maintained at or above current levels during this period of volatility and global economic uncertainty.

The situation is dynamic and the ultimate duration and magnitude of the impact on the economy and the financial effect on our Company is not known at this time.

On June 1, 2020 and December 7, 2020, we completed the semi-annual re-determinations of our revolving credit facility resulting in a reduction of the borrowing base from $300.0 million to $225.0 million and further to $215.0 million, with $200 million readily available and $15 million subject to approval by majority lenders until June 29, 2021 and $20 million plus 50% of outstanding amounts owing under certain advance payment agreements starting June 30, 2021 and ending October 1, 2021. We intentionally apply all excess cash to the facility and minimize cash on the balance to reduce borrowing costs. We can borrow under the facility by providing the lenders with two days notice. Availability under the revolving credit facility is determined by the reserves-based borrowing determined by the lenders. At December 31, 2020, we had $190.0 million drawn under the revolving credit facility. As of February 19, 2021, outstanding borrowings under our credit facility remained at $190.0 million.

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We have also obtained a relief from compliance with certain financial covenants until October 1, 2021 ("the covenant relief period"), permitting the ratio of total debt to Covenant EBITDAX ("EBITDAX") to be greater than 4.0 to 1.0, Senior Secured Debt to EBITDAX ratio must not exceed 2.5 to 1.0, and EBITDAX to interest expense ratio for the trailing four quarter periods measured as of the last day of the fiscal quarters ending (i) December 31, 2020 and March 31, 2021, must be at least 1.5 to 1.0 (ii) June 30, 2021 and September 30, 2021 must be at least 2.0 to 1.0, and be at least 2.5 to 1.0 thereafter. We are required to comply with various covenants, which as disclosed above, have been modified in response to the current market conditions and the COVID-19 pandemic. As of December 31, 2020, we were in compliance with all applicable covenants under the revolving credit facility.

In addition to the covenant relief, the amendment to the credit agreement in connection with the semi-annual re-determination also amended the interest rate to either, at the borrower’s option, LIBOR plus a spread ranging from 2.90% to 4.90%, or base rate plus a spread ranging from 1.90% to 3.90%, with such spread in each case dependent upon our Senior Secured Leverage Ratio (as defined in the credit agreement), provided that during the covenant relief period the spread is increased by 125 basis points, (i) provided for a borrowing condition that we shall not have cash and cash equivalents (other than Excluded Cash, as defined in the credit agreement) in excess of $15.0 million, (ii) added certain mandatory prepayments, including for cash balances in excess of $15.0 million and (iii) amended and added certain negative covenants, including, without limitation, certain additional limitations on occurrence of indebtedness, liens and investments, the making of restricted payments, prepayments of indebtedness, and acquisitions and mergers.

After the expiration of covenant relief period, we must maintain compliance with the following financial covenants: limitations on Company's ratio of debt to EBITDAX to a maximum of 4.0 to 1.0; limitations on Company's ratio of Senior Secured Debt to EBITDAX to a maximum of 3.0 to 1.0; and the maintenance of a ratio of EBITDAX to interest expense of at least 2.5 to 1.0. If we fail to comply with these financial covenants, it would result in a default under the terms of the credit agreement, which could result in an acceleration of repayment of all indebtedness under our revolving credit facility. Under the terms of the credit facility, we are limited in our ability to pay any dividends to our shareholders without bank approval.

At December 31, 2020, we had $300.0 million of 7.75% Senior Notes due 2027 (the “7.75% Senior Notes”) and $300.0 million of 6.25% Senior Notes due 2025 (the “6.25% Senior Notes” and, together with the 7.75% Senior Notes, the “Senior Notes”) The Senior Notes are fully and unconditionally guaranteed by the Company and certain subsidiaries of the Company that guarantee its revolving credit facility.

The 7.75% Senior Notes bear interest at a rate of 7.75% per year, payable semi-annually in arrears on May 23 and November 23 of each year, beginning on November 23, 2019. The 7.75% Senior Notes will mature on May 23, 2027, unless earlier redeemed or repurchased.

The 6.25% Senior Notes bear interest at a rate of 6.25% per year, payable semi-annually in arrears on February 15 and August 15 of each year, beginning on August 15, 2018. The 6.25% Senior Notes will mature on February 15, 2025, unless earlier redeemed or repurchased.

An event of default under the revolving credit facility would result in a default under the indentures governing the Senior Notes, which could allow the note holders to require us to repurchase all of the outstanding Senior Notes.

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Cash and Cash Equivalents Held Outside of Canada and the United States

At December 31, 2020, 97% of our cash and cash equivalents were held by subsidiaries outside of Canada and the United States.

Derivative Positions

At December 31, 2020, we had outstanding commodity price derivative positions as follows:

Period and Type of Instrument	Volume, bopd	Reference	Sold Put ($/bbl, Weighted Average)	Purchased Put ($/bbl, Weighted Average)	Sold Call ($/bbl, Weighted Average)	Premium ($/bbl, Weighted Average)
Three-way Collars: January 1, to June 30, 2021	14,000	ICE Brent	36.43	45.14	51.45	0.21
Collars: January 1, to June 30, 2021	1,000	ICE Brent	n/a	45.00	50.40	n/a
Swaptions: July 1, to December 31, 2021	3,000	ICE Brent	n/a	n/a	56.75	n/a

Subsequent to December 31, 2020 , we entered into commodity price and foreign currency derivative positions as follows:

Period and Type of Instrument	Volume, bopd	Reference	Sold Put ($/bbl, Weighted Average)	Purchased Put ($/bbl, Weighted Average)	Sold Call ($/bbl, Weighted Average)	Premium ($/bbl, Weighted Average)
Three-way Collars: July 1, to December 31, 2021	4,000	ICE Brent	45.00	55.00	68.00	n/a

A collar limits the range of possible positive and negative returns and provides us downside protection at a lower cost compared to a swap.

Period and Type of Instrument	Amount Hedged (Millions of COP)	U.S. Dollar Equivalent of Amount Hedged (Thousands of U.S. Dollars)(1)	Reference	Floor Price (COP, Weighted Average)	Cap Price (COP, Weighted Average)
Collars: March 1, to December 31, 2021	10,000	3,051	COP	3,500	3,630

(1) At December 31, 2020 foreign exchange rate.

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Cash Flows

The following table presents our sources and uses of cash and cash equivalents for the periods presented:

	Year Ended December 31,
	2020		2019
Sources of Cash and Cash Equivalents:
Net (loss) income	$	(777,967)	$	38,690
Adjustments to reconcile net (loss) income to funds flow from operations
DD&A expenses	164,233		225,033
Asset impairment	564,495		—
Goodwill Impairment	102,581		—
Deferred tax (recovery) expense	(76,148)		40,227
Stock-based compensation expense	1,216		1,430
Amortization of debt issuance costs	3,625		3,376
Unrealized foreign exchange loss	5,271		1,803
Other non-cash loss	2,026		—
Financial instruments loss (gain)	50,982		(46,215)
Non-cash lease expenses	1,951		1,806
Lease payments	(1,926)		(1,969)
Cash settlement of financial instruments	4,874		(3,273)
Loss on redemption of Convertible Notes	—		11,501
Funds flow from operations (1)	45,213		272,409
Changes in non-cash operating working capital	36,062		—
Proceeds from issuance of Senior Notes, net of issuance costs	—		289,271
Proceeds from other debt, net of issuance costs	88,332		342,575
	169,607		904,255
Uses of Cash and Cash Equivalents:
Additions to property, plant and equipment - property acquisitions	—		(77,772)
Additions to property, plant and equipment	(96,281)		(379,314)
Repayment of debt	(17,000)		(349,219)
Lease payments	(879)		—
Changes in non-cash operating working capital	—		(93,874)
Changes in non-cash investing working capital	(48,642)		(7,851)
Cash settlement of asset retirement obligation	(201)		(870)
Repurchase of shares of Common Stock	—		(37,561)
Foreign exchange loss on cash and cash equivalents and restricted cash and cash equivalents	(156)		(1,027)
	(163,159)		(947,488)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents	$	6,448	$	(43,233)

(1) Funds flow from operations is a non-GAAP measure which does not have any standardized meaning prescribed under GAAP. Refer to "Financial and Operational Highlights - Non-GAAP measures" for a definition and reconciliation of this measure.

Off-Balance Sheet Arrangements

As at December 31, 2020 and 2019, we had no off-balance sheet arrangements.

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Contractual Obligations

The following is a schedule by year of purchase obligations, future minimum payments for firm agreements and leases that have initial or remaining non-cancelable terms in excess of one year as of December 31, 2020:

(Thousands of U.S. Dollars)	Total		2021		2022-2023		2024-2025		2026 and beyond
Revolving credit facility	$	190,000	$	—	$	190,000	$	—	$	—
6.25% Senior Notes	300,000		—		—		300,000		—
7.75% Senior Notes	300,000		—		—		—		300,000
Total long-term debt	790,000		—		190,000		300,000		300,000
Interest payments (1)	245,965		52,729		93,209		67,542		32,485
Operating leases	4,910		2,330		2,580		—		—
Finance leases	4,725		3,197		1,501		27		—
Software and Telecommunication	900		300		600		—		—
Total	$	1,046,500	$	58,556	$	287,890	$	367,569	$	332,485

(1) Interest payments were calculated by assuming that our revolving credit facility outstanding balance at December 31, 2020 of $190.0 million will be outstanding through the November 2022 maturity date and our 6.25% Senior Notes and 7.75% Senior Notes will be held until their maturity dates of February 2025 and May 2027, respectively. Actual results will differ from these estimates and assumptions.

At December 31, 2020, we had provided promissory notes totaling $100.6 million (2019 - $120.6 million) to support letters of credit or surety bonds relating to work commitment guarantees contained in exploration contracts and other capital or operating requirements. These unsecured letters of credit do not utilize our revolving credit facility capacity because they are backed by local Colombian banks and Export Development Canada.

The above table does not reflect estimated amounts expected to be incurred in the future associated with the abandonment of our oil and gas properties and other long-term liabilities, as we cannot determine with accuracy the timing of such payments. Information regarding our asset retirement obligation can be found in Note 10 to the Consolidated Financial Statements, Asset Retirement Obligation, in Item 8 “Financial Statements and Supplementary Data”.

As is customary in the oil and gas industry, we may at times have commitments in place to reserve or earn certain acreage positions or wells. If we do not meet such commitments, the acreage positions or wells may be lost and associated penalties may be payable.

Critical Accounting Policies and Estimates

The preparation of financial statements under GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities as well as the revenues and expenses reported and disclosure of contingent liabilities. Changes in these estimates related to judgments and assumptions will occur as a result of changes in facts and circumstances or discovery of new information, and, accordingly, actual results could differ from amounts estimated.

On a regular basis we evaluate our estimates, judgments and assumptions. We also discuss our critical accounting policies and estimates with the Audit Committee of the Board of Directors.

Certain accounting estimates are considered to be critical if (a) the nature of the estimates and assumptions is material due to the level of subjectivity and judgment necessary to account for highly uncertain matters or the susceptibility of such matters to changes; and (b) the impact of the estimates and assumptions on financial condition or operating performance is material. The areas of accounting and the associated critical estimates and assumptions made are discussed below.

Full Cost Method of Accounting, Proved Reserves, DD&A and Impairment of Oil and Gas Properties

We follow the full cost method of accounting for our oil and natural gas properties in accordance with SEC Regulation S-X Rule 4-10, as described in Note 2 to the Consolidated Financial Statements, Significant Accounting Policies, in Item 8 “Financial Statements and Supplementary Data”. Under the full cost method of accounting, all costs incurred in the acquisition, exploration and development of properties are capitalized, including internal costs directly attributable to these activities. The

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sum of net capitalized costs, including estimated asset retirement obligations ("ARO"), and estimated future development costs to be incurred in developing proved reserves are depleted using the unit-of-production method.

Companies that use the full cost method of accounting for oil and natural gas exploration and development activities are required to perform a ceiling test calculation. The ceiling test limits pooled costs to the aggregate of the discounted estimated after-tax future net revenues from proved oil and gas properties, plus the lower of cost or estimated fair value of unproved properties less any associated tax effects.

If our net book value of oil and gas properties, less related deferred income taxes, is in excess of the calculated ceiling, the excess must be written off as an expense. Any such write-down will reduce earnings in the period of occurrence and result in lower DD&A expenses in future periods. The ceiling limitation is imposed separately for each country in which we have oil and gas properties. An expense recorded in one period may not be reversed in a subsequent period even though higher oil and gas prices may have increased the ceiling applicable to the subsequent period.

Our estimates of proved oil and gas reserves are a major component of the depletion and full cost ceiling calculations. Additionally, our proved reserves represent the element of these calculations that require the most subjective judgments. Estimates of reserves are forecasts based on engineering data, projected future rates of production and the amount and timing of future expenditures. The process of estimating oil and natural gas reserves requires substantial judgment, resulting in imprecise determinations, particularly for new discoveries. Different reserve engineers may make different estimates of reserve quantities based on the same data.

We believe our assumptions are reasonable based on the information available to us at the time we prepare our estimates. However, these estimates may change substantially as additional data from ongoing development activities and production performance becomes available and as economic conditions impacting oil and gas prices and costs change.

Management is responsible for estimating the quantities of proved oil and natural gas reserves and for preparing related disclosures. Estimates and related disclosures are prepared in accordance with SEC requirements and generally accepted industry practices in the United States as prescribed by the Society of Petroleum Engineers. Reserve estimates are evaluated at least annually by independent qualified reserves consultants.

While the quantities of proved reserves require substantial judgment, the associated prices of oil and natural gas and the applicable discount rate, that are used to calculate the discounted present value of the reserves do not require judgment. The ceiling calculation dictates that a 10% discount factor be used and future net revenues are calculated using prices that represent the average of the first day of each month price for the 12-month period. Therefore, the future net revenues associated with the estimated proved reserves are not based on our assessment of future prices or costs, but reflect adjustments for gravity, quality, local conditions, gathering and transportation fees and distance from market. Estimates of standardized measure of our future cash flows from proved reserves for our December 31, 2020, ceiling tests were based on wellhead prices per bbl as of the first day of each month within that twelve month period.

Because the ceiling test calculation dictates the use of prices that are not representative of future prices and requires a 10% discount factor, the resulting value should not be construed as the current market value of the estimated oil and gas reserves attributable to our properties. Historical oil and gas prices for any particular 12-month period can be either higher or lower than our price forecast. Therefore, oil and gas property write-downs that result from applying the full cost ceiling limitation, and that are caused by fluctuations in price as opposed to reductions to the underlying quantities of reserves should not be viewed as absolute indicators of a reduction of the ultimate value of the related reserves.

Our Reserves Committee oversees the annual review of our oil and gas reserves and related disclosures. The Board meets with management periodically to review the reserves process, results and related disclosures and appoints and meets with the independent reserves consultants to review the scope of their work, whether they have had access to sufficient information, the nature and satisfactory resolution of any material differences of opinion, and in the case of the independent reserves consultants, their independence.

We assessed our oil and gas properties for impairment as at December 31, 2020, and recorded ceiling test impairment losses of

$560.3 million related to lower oil prices. For the year ended December 31, 2019, we had no ceiling test impairment losses. We used an average Brent price of $43.43 per bbl less corresponding differentials for the purposes of the December 31, 2020 ceiling test calculations (2019 - $64.20).

It is difficult to predict with reasonable certainty the amount of expected future impairment losses given the many factors impacting the asset base and the cash flows used in the prescribed U.S. GAAP ceiling test calculation. These factors include,

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but are not limited to, future commodity pricing, royalty rates in different pricing environments, operating costs and negotiated savings, foreign exchange rates, capital expenditures timing and negotiated savings, production and its impact on depletion and cost base, upward or downward reserve revisions as a result of ongoing exploration and development activity, and tax attributes.

Unproved Properties

Unproved properties are not depleted pending the determination of the existence of proved reserves. Costs are transferred into the amortization base on an ongoing basis as the properties are evaluated and proved reserves are established or impairment is determined. Unproved properties are evaluated quarterly to ascertain whether impairment has occurred. Unproved properties, the costs of which are individually significant, are assessed individually by considering seismic data, plans or requirements to relinquish acreage, drilling results and activity, remaining time in the commitment period, remaining capital plans and political, economic and market conditions. Where it is not practicable to individually assess the amount of impairment of properties for which costs are not individually significant, these properties are grouped for purposes of assessing impairment. During any period in which factors indicate an impairment, the cumulative costs incurred to date for such property are transferred to the full cost pool and are then subject to amortization. The transfer of costs into the amortization base involves a significant amount of judgment and may be subject to changes over time based on our drilling plans and results, seismic evaluations, the assignment of proved reserves, availability of capital and other factors. For countries where a reserve base has not yet been established, the impairment is charged to earnings.

Asset Retirement Obligations

We are required to remove or remedy the effect of our activities on the environment at our present and former operating sites by dismantling and removing production facilities and remediating any damage caused. Estimating our future ARO requires us to make estimates and judgments with respect to activities that will occur many years into the future. In addition, the ultimate financial impact of environmental laws and regulations is not always clearly known and cannot be reasonably estimated as standards evolve in the countries in which we operate.

We record ARO in our consolidated financial statements by discounting the present value of the estimated retirement obligations associated with our oil and gas wells and facilities. In arriving at amounts recorded, we make numerous assumptions and judgments with respect to the existence of a legal obligation for an ARO, estimated probabilities, amounts and timing of settlements, inflation factors, credit-adjusted risk-free discount rates and changes in legal, regulatory, environmental and political environments. Because costs typically extend many years into the future, estimating future costs is difficult and requires management to make judgments that are subject to future revisions based upon numerous factors, including changing technology and the political and regulatory environment. In periods subsequent to initial measurement of the ARO, we must recognize period-to-period changes in the liability resulting from the passage of time and revisions to either the timing or the amount of the original estimate of undiscounted cash flows. Increases in the ARO liability due to passage of time impact net income as accretion expense. The related capitalized costs, including revisions thereto, are charged to expense through DD&A.

It is difficult to determine the impact of a change in any one of our assumptions. As a result, we are unable to provide a reasonable sensitivity analysis of the impact a change in our assumptions would have on our financial results.

Equity Method Investment

During December 2017, we acquired an investment in common shares of PetroTal Corp. ("PetroTal") in connection with the sale of our Peru business unit. At December 31, 2020, this investment represented approximately 30% of PetroTal's issued and outstanding common shares. We determined that we did not have a controlling financial interest in PetroTal, but could exert significant influence over PetroTal's operating and financial policies as a result of our ownership interest in PetroTal and the right to nominate two directors to PetroTal's board of directors. Accordingly, we accounted for our investment in the common shares of PetroTal as an equity method investment, but elected the fair value option for this investment. On January 21, 2021 we sold 44% percent of our interest in PetroTal for cash proceeds of $14.8 million.

The fair value of the investment was estimated using quoted market prices in active markets. Information regarding the valuation of the investment can be found in Note 15 to the Consolidated Financial Statements, Financial Instruments, Fair Value Measurement, Credit Risk and Foreign Exchange Risk in Item 8 “Financial Statements and Supplementary Data”, which information is incorporated by reference here.

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Goodwill

Goodwill represented the excess of the aggregate of the consideration transferred over net identifiable assets acquired and liabilities assumed. The goodwill that was recorded on our balance sheet related entirely to our Colombia reporting unit.

At each reporting date, we assessed qualitative factors to determine whether it was more likely than not that the fair value of the reporting unit was less than its carrying amount and whether it was necessary to perform the goodwill impairment test. Changes in our future cash flows, operating results, growth rates, capital expenditures, cost of capital, discount rates, stock price or related market capitalization, could affect the results of our annual goodwill assessment and, accordingly, led to goodwill impairment charges. The goodwill impairment test required a comparison of the fair value of the reporting unit to its net book value. We performed step 1 of the goodwill impairment test as at the end of the first quarter of 2020, which resulted in a full write-down of goodwill. The most significant judgments involved in estimating the fair value of our reporting unit related to the valuation of our property and equipment.

Leases

At inception of a contract, we assess whether a contract is, or contains, a lease. A contract is, or contains, a lease if the contract conveys the right to control the use of an identified asset for a period of time in exchange for consideration. At inception of a contract that contains a lease component, we allocate the consideration in the contract to each lease and non-lease component on the basis of their relative stand-alone prices. We recognize a right-of-use asset and a lease liability at the lease commencement date. The right-of-use asset is initially measured at cost, and subsequently at cost less any accumulated depreciation and impairment losses, and adjusted for certain remeasurements of the lease liability.

The lease liability is initially measured at the present value of the lease payments that are not paid at the commencement date, discounted using the interest rate implicit in the lease or, if that rate cannot be readily determined, our incremental borrowing rate. Generally, we use our incremental borrowing rate as the discount rate. The lease liability is subsequently increased by the interest cost on the lease liability and decreased by lease payments made. It is remeasured when there is a change in future lease payments arising from a change in an index or rate, a change in the estimate of the amount expected to be payable under a residual value guarantee, or as appropriate, changes in the assessment of whether a purchase or extension option is reasonably certain to be exercised or a termination option is reasonably certain not to be exercised.

We have applied judgment to determine the lease term for contracts which include renewal or termination options. The assessment of whether we are reasonably certain to exercise such options impacts the lease term, which significantly affects the amount of lease liabilities and right-of-use assets recognized.

Revenue from Contracts with Customers

Our revenue relates to oil sales in Colombia. We recognize revenue when it transfers control of the product to a customer. This generally occurs at the time the customer obtains legal title to the product and when it is physically transferred to the delivery point agreed with the customer. Payment terms are generally within three business days following delivery of an invoice to the customer. Revenue is recognized based on the consideration specified in contracts with customers. Revenue represents our share and is recorded net of royalty payments to governments and other mineral interest owners.

We evaluate our arrangement with third parties and partners to determine if we act as a principal or an agent. In making this evaluation, our management considers if we obtain control of the product delivered, which is indicated by us having the primary responsibility for the delivery of the product, having ability to establish prices or having inventory risk. If we act in the capacity of an agent rather than as a principal in transaction, then the revenue is recognized on a net-basis, only reflecting the fee realized by us from the transaction.

Tariffs, tolls and fees charged to other entities for use of pipelines owned by us are evaluated by management to determine if these originate from contracts with customers or from incidental arrangements.

In the comparative period, revenue from the production of oil and natural gas was recognized when the customer took title and assumed the risks and rewards of ownership, prices were fixed or determinable, the sale was evidenced by a contract and collection of the revenue was reasonably assured.

When determining if we acted as a principal or as an agent in transactions, management determines if we obtain control of the product. As part of this assessment, management considers detailed criteria for revenue recognition set out in ASC 606.

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Allowance for credit losses

At each reporting date, we assess the expected lifetime credit losses on initial recognition of trade accounts receivable. Credit risk is assessed based on the number of days the receivable has been outstanding and the internal credit assessment of the customer. The expected loss rates are based on payment profiles over a period of 36 months prior to the period-end and the corresponding historical credit losses experienced within this period. Historical loss rates are adjusted to reflect current and forward looking economic factors of the country where we sell oil affecting the ability of the customers to settle the receivables. Trade receivables are written off when there is no reasonable expectation of recovery.

Income Taxes

We follow the liability method of accounting for income taxes whereby we recognize deferred income tax assets and liabilities for the future tax consequences attributable to differences between the financial statement carrying amounts of assets and liabilities and their respective tax bases. Deferred tax assets are also recognized for the future tax benefits attributable to the expected utilization of existing tax net operating loss carryforwards and other types of carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences and carryforwards are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.

We carry on business in several countries and as a result, we are subject to income taxes in numerous jurisdictions. The determination of our income tax provision is inherently complex and we are required to interpret continually changing regulations and make certain judgments. While income tax filings are subject to audits and reassessments, we believe we have made adequate provision for all income tax obligations. However, changes in facts and circumstances as a result of income tax audits, reassessments, jurisprudence and any new legislation may result in an increase or decrease in our provision for income taxes.

To assess the realization of deferred tax assets, we consider whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. We consider the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment.

Our effective tax rate is based on pre-tax income and the tax rates applicable to that income in the various jurisdictions in which we operate. An estimated effective tax rate for the year is applied to our quarterly operating results. In the event that there is a significant unusual or discrete item recognized, or expected to be recognized, in our quarterly operating results, the tax attributable to that item would be separately calculated and recorded at the same time as the unusual or discrete item. We consider the resolution of prior-year tax matters to be such items. Significant judgment is required in determining our effective tax rate and in evaluating our tax positions. We establish reserves when it is more likely than not that we will not realize the full tax benefit of the position. We adjust these reserves in light of changing facts and circumstances.

We routinely assess potential uncertain tax positions and, if required, estimate and establish accruals for such amounts.

Legal and Other Contingencies

A provision for legal and other contingencies is charged to expense when the loss is probable and the cost can be reasonably estimated. Determining when expenses should be recorded for these contingencies and the appropriate amounts for accrual is a complex estimation process that includes the subjective judgment of management. In many cases, management’s judgment is based on interpretation of laws and regulations, which can be interpreted differently by regulators and/or courts of law. Management closely monitors known and potential legal and other contingencies and periodically determines when we should record losses for these items based on information available to us.

Stock-Based Compensation

Our stock-based compensation cost is measured based on the fair value of the awards that are ultimately expected to vest. Fair values are determined using pricing models such as the Black-Scholes simulation stock option-pricing model and/or observable share prices. These estimates depend on certain assumptions, including volatility, risk-free interest rate, the term of the awards, the forfeiture rate and performance factors, which, by their nature, are subject to measurement uncertainty. We use historical data to estimate the expected term used in the Black-Scholes option pricing model, option exercises and employee departure behavior. Expected volatilities used in the fair value estimate are based on the historical volatility of our shares. The risk-free

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rate for periods within the expected term of the stock options is based on the U.S. Treasury yield curve in effect at the time of grant.

Risks and Measurement uncertainty

In March 2020, the outbreak of the COVID-19 virus, which was declared a pandemic by the World Health Organization, has spread across the globe and impacted worldwide economic activity. In addition, global commodity prices declined significantly due to disputes between major oil producing countries combined with the impact of the COVID-19 pandemic and associated reductions in global demand for oil. Governments worldwide, including those in Colombia and Ecuador, the countries where we operate, enacted emergency measures to combat the spread of the virus. These measures, which include the implementation of travel bans, self-imposed quarantine periods and physical distancing, have caused material disruption to businesses globally resulting in an economic slowdown. Governments and central banks have reacted with significant monetary and fiscal interventions designed to stabilize economic conditions; however, the success of these interventions is not currently determinable. The current challenging economic climate is having and may continue to have significant adverse impacts on our Company including, but not exclusively:

•material declines in revenue and cash flows as a result of the decline in commodity prices;

•declines in revenue and operating activities due to reduced capital programs and the shut-in of production;

•impairment charges;

•inability to comply with covenants and restrictions in debt agreements;

•inability to access financing sources;

•increased risk of non-performance by our customers and suppliers;

•interruptions in operations as we adjust personnel to the dynamic environment; and

•inability to operate or delay in operations as a result COVID-19 restrictions in the countries in which we operate

The situation is dynamic and the ultimate duration and magnitude of the impact on the economy and the financial effect on our Company is not known at this time. Estimates and judgments made by management in the preparation of the financial statements are increasingly difficult and subject to a higher degree of measurement uncertainty during this volatile period. In the near term, matters in these financial statements that are most subject to be impacted by this volatile period are our assessment of liquidity and access to capital, the carrying value of long-lived assets and the valuation of the deferred tax assets.

Recently Adopted Accounting Pronouncements

Financial Instruments - Credit Losses (ASC 326)

In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses". This ASU replaces the incurred loss impairment methodology with a methodology that reflects expected credit losses and requires a broader range of reasonable and supportable information to support credit loss estimates. In December 2019, the FASB issued ASU 2019-10, "Financial Instruments - Credit Losses, Derivatives and Hedging and Leases", which is codification improvement of ASU 2016-13. We adopted this ASU on January 1, 2020, the adoption of which had no impact on our consolidated balance sheet, results of operations or cash flows.

Item 8. Financial Statements and Supplementary Data

Report of Independent Registered Public Accounting Firm

To the Shareholders and Board of Directors of Gran Tierra Energy Inc.:

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of Gran Tierra Energy Inc. (the Company) as of December 31, 2020 and 2019, the related consolidated statements of operations, shareholders’ equity and cash flows for each of the years then ended, and the related notes (collectively, the consolidated 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 years then ended, in conformity with U.S. generally accepted accounting principles.

We also have 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

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Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated February 24, 2021 expressed an unqualified opinion on the effectiveness of 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 these 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.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current period audit of the consolidated 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 consolidated 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 consolidated 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.

Realizability of the deferred income tax asset.

As discussed in Note 13 to the consolidated financial statements, as of December 31, 2020, the Company had recognized a deferred income tax asset of $57.3 million. The Company estimated that there was a greater than 50 percent likelihood that the deferred income tax asset will be realized. The determination of the deferred income tax asset involves a number of estimates, including the future cash flows associated with the estimated proved oil and gas reserves (“proved reserves”). The estimation of the proved reserves involves the expertise of independent reservoir engineering specialists, who take into consideration assumptions related to its forecasted production, forecasted operating, royalty and capital cost assumptions and forecasted oil prices (“reserve assumptions”). The Company engages independent reservoir engineering specialists to estimate the proved reserves.

We identified the evaluation of the realizability of the deferred income tax asset as a critical audit matter. Changes in reserve assumptions could have had a significant impact on the determination of the Company’s ability to realize the deferred income tax asset and the amount of a valuation allowance, if any. A high degree of auditor judgment was required in evaluating the reserve assumptions used to estimate the proved reserves, which was an input to derive the deferred income tax asset. Additionally, the nature and extent of audit effort associated with this estimate required specialized skills and knowledge.

The following are the primary procedures we performed to address this critical audit matter. We evaluated the design and tested the operating effectiveness of certain internal controls related to the critical audit matter, including controls over the estimation of the proved reserves and the related reserve assumptions. We evaluated the competence, capabilities and objectivity of the independent reservoir engineering specialists engaged by the Company, who estimated the proved reserves. We evaluated the methodology used by independent reservoir engineering specialists to estimate the proved reserves for compliance with regulatory standards. We compared the 2020 actual production, operating, royalty and capital costs to those estimates used in the prior year’s estimate of the proved reserves to assess the Company’s ability to accurately forecast. We assessed the forecasted commodity prices used in the proved reserves by comparing them to those published by other reserve engineering firms. We assessed the estimates of forecasted production and forecasted operating, royalty and capital cost assumptions used in the proved reserves by comparing them to historical results. We involved Canadian and Colombian income tax professionals with specialized skills and knowledge who assisted in evaluating the application of relevant tax laws and regulations used in the determination of the recognized deferred tax asset.

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Impact of estimated proved oil reserves on the calculations of depletion expense and the ceiling test related to oil and gas properties

As discussed in Note 2 to the consolidated financial statements, the Company depletes its oil and gas properties using the unit-of-production method on a country-by-country basis. Under such method, capitalized costs associated with Colombia are depleted over the estimated proved oil and gas reserves associated with Colombia. As discussed in Note 5 to the consolidated financial statements, for the year ended December 31, 2020, the Company recorded depletion and depreciation expense of $160.8 million. Additionally, as discussed in Note 2 and 6 to the consolidated financial statements, the Company performs a ceiling test calculation each quarter and for the year ended December 31, 2020 the Company recorded ceiling test impairments of $560.3 million. In performing its quarterly ceiling test, the Company limits, on a country-by-country basis, the capitalized costs of proved oil and natural gas properties, net of accumulated depletion and deferred income taxes, to the estimated future net cash flows from proved reserves discounted at 10 percent, net of related tax effects, plus the lower of cost or fair value of unproved properties included in the costs being amortized. If such capitalized costs exceed the ceiling, the Company will record a write-down to the extent of such excess as a non-cash charge to net income or loss. The estimation of proved reserves, which are used in the calculations of depletion and the ceiling test, involves the expertise of independent reservoir engineering specialists, who take into consideration reserve assumptions. The Company engages independent reservoir engineering specialists to estimate the proved reserves.

We identified the assessment of the impact of estimated proved reserves on the calculations of depletion expense and the ceiling test related to oil and gas properties as a critical audit matter. Changes in reserve assumptions could have had a significant impact on the calculations of depletion expense and the ceiling tests. A high degree of auditor judgment was required in evaluating the proved reserves, and related reserve assumptions, which were an input to the calculations of depletion expense and the ceiling test.

The following are the primary procedures we performed to address this critical audit matter. We evaluated the design and tested the operating effectiveness of certain internal controls related to the critical audit matter, including controls over the calculation of depletion expense and the ceiling test and controls over the estimation of the proved reserves, including the reserve assumptions. We assessed the calculations of depletion expense and the ceiling test for compliance with regulatory standards. We evaluated the competence, capabilities and objectivity of the independent reservoir engineering specialists engaged by the Company, who estimated the proved reserves. We evaluated the methodology used by the independent reservoir engineering specialists to estimate the proved reserves for compliance with regulatory standards. We compared the Company’s 2020 actual production, operating, royalty and capital costs to those estimates used in the prior year’s estimate of the proved reserves to assess the Company’s ability to accurately forecast. We assessed the estimates of forecasted production and forecasted operating, royalty and capital cost assumptions used in the estimate of the proved reserves by comparing them to historical results.

We have served as the Company’s auditor since 2018.

/s/ KPMG LLP

Chartered Professional Accountants

Calgary, Canada

February 24, 2021

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Gran Tierra Energy Inc.

Consolidated Statements of Operations

(Thousands of U.S. Dollars, Except Share and Per Share Amounts)

	Year Ended December 31,
	2020		2019
OIL SALES (NOTE 11)	$	237,838	$	570,983
EXPENSES
Operating	111,888		183,204
Transportation	10,543		20,400
COVID-19 related costs (Note 12)	2,679		—
Depletion, depreciation and accretion (Note 5)	164,233		225,033
Goodwill impairment (Note 6)	102,581		—
Asset impairment (Note 6)	564,495		—
General and administrative	23,722		34,730
Severance	1,628		1,771
Foreign exchange loss	4,184		627
Financial instruments loss (gain) (Note 15)	50,982		(46,215)
Interest expense (Note 8)	54,140		43,268
TOTAL EXPENSES	1,091,075		462,818
OTHER LOSS	(469)		(12,886)
INTEREST INCOME	345		696
(LOSS) INCOME BEFORE INCOME TAXES	(853,361)		95,975
INCOME TAX EXPENSE (RECOVERY)
Current (Note 13)	754		17,058
Deferred (Note 13)	(76,148)		40,227
	(75,394)		57,285
NET AND COMPREHENSIVE (LOSS) INCOME	$	(777,967)	$	38,690
NET (LOSS) INCOME PER SHARE
–BASIC AND DILUTED	$	(2.12)	$	0.10
WEIGHTED AVERAGE SHARES OUTSTANDING - BASIC (Note 9)	366,981,556		376,495,306
WEIGHTED AVERAGE SHARES OUTSTANDING - DILUTED (Note 9)	366,981,556		376,507,812

(See notes to the consolidated financial statements)

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Gran Tierra Energy Inc.

Consolidated Balance Sheets

(Thousands of U.S. Dollars, Except Share and Per Share Amounts)

	As at December 31,
	2020		2019
ASSETS
Current Assets
Cash and cash equivalents	$	13,687	$	8,301
Restricted cash and cash equivalents (Note 10)	427		516
Accounts receivable (Note 3)	8,044		36,291
Investment (Note 15)	48,323		94,741
Taxes receivable (Note 4)	49,962		135,838
Other current assets	13,459		15,001
Total Current Assets	133,902		290,688
Oil and Gas Properties (using the full cost method of accounting)
Proved	797,355		1,258,934
Unproved	161,763		310,809
Total Oil and Gas Properties	959,118		1,569,743
Other capital assets	5,364		7,650
Total Property, Plant and Equipment (Note 5)	964,482		1,577,393
Other Long-Term Assets
Taxes receivable (Note 4)	42,635		25,869
Deferred tax assets (Note 13)	57,318		44,003
Other long-term assets	3,425		4,130
Goodwill (Note 6)	—		102,581
Total Other Long-Term Assets	103,378		176,583
Total Assets	$	1,201,762	$	2,044,664
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current Liabilities
Accounts payable and accrued liabilities (Note 7)	$	100,784	$	195,513
Derivatives (Note 15)	12,050		775
Taxes payable	37		—
Equity compensation award liability (Note 9 and 15)	805		3,053
Total Current Liabilities	113,676		199,341
Long-Term Liabilities
Long-term debt (Note 8)	774,770		700,459
Deferred tax liabilities (Note 13)	—		59,762
Asset retirement obligation (Note 10)	48,214		43,419
Equity compensation award liability (Note 9 and 15)	3,955		4,806
Other long-term liabilities	4,113		4,267
Total Long-Term Liabilities	831,052		812,713
Commitments and Contingencies (Note 14)
Shareholders’ Equity
Common Stock (Note 9) (366,981,556 and 366,981,556 shares of Common Stock, par value $0.001 per share, issued and outstanding as at December 31, 2020 and December 31, 2019, respectively)	10,270		10,270
Additional paid in capital	1,285,018		1,282,627
Deficit	(1,038,254)		(260,287)
Total Shareholders’ Equity	257,034		1,032,610
Total Liabilities and Shareholders’ Equity	$	1,201,762	$	2,044,664

(See notes to the consolidated financial statements)

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Gran Tierra Energy Inc.

Consolidated Statements of Cash Flows

(Thousands of U.S. Dollars)

	Year Ended December 31,
	2020		2019
Operating Activities
Net (loss) income	$	(777,967)	$	38,690
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depletion, depreciation and accretion (Note 5)	164,233		225,033
Goodwill Impairment (Note 6)	102,581		—
Asset impairment (Note 6)	564,495		—
Deferred tax (recovery) expense (Note 13)	(76,148)		40,227
Stock-based compensation (Note 9)	1,216		1,430
Amortization of debt issuance costs (Note 8)	3,625		3,376
Non-cash lease expenses	1,951		1,806
Lease payments	(1,926)		(1,969)
Unrealized foreign exchange loss	5,271		1,803
Financial instruments loss (gain) (Note 15)	50,982		(46,215)
Cash settlement of financial instruments	4,874		(3,273)
Cash settlement of asset retirement obligation (Note 10)	(201)		(870)
Other non-cash loss	2,026		—
Loss on redemption of Convertible Notes	—		11,501
Net change in assets and liabilities from operating activities (Note 16)	36,062		(93,874)
Net cash provided by operating activities	81,074		177,665
Investing Activities
Additions to property, plant and equipment (Note 5)	(96,281)		(379,314)
Property acquisitions (Note 5)	—		(77,772)
Changes in non-cash investing working capital	(48,642)		(7,851)
Net cash used in investing activities	(144,923)		(464,937)
Financing Activities
Proceeds from issuance of Senior Notes, net of issuance costs (Note 8)	—		289,271
Proceeds from bank debt, net of issuance costs	88,332		342,575
Repayment of debt	(17,000)		(349,219)
Lease payments	(879)		—
Repurchase of shares of Common Stock (Note 9)	—		(37,561)
Net cash provided by financing activities	70,453		245,066
Foreign exchange loss on cash and cash equivalents and restricted cash and cash equivalents	(156)		(1,027)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents	6,448		(43,233)
Cash and cash equivalents and restricted cash and cash equivalents, beginning of year (Note 16)	11,075		54,308
Cash and cash equivalents and restricted cash and cash equivalents, end of year (Note 16)	$	17,523	$	11,075
Supplemental cash flow disclosures (Note 16)

(See notes to the consolidated financial statements)

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Gran Tierra Energy Inc.

Consolidated Statements of Shareholders’ Equity

(Thousands of U.S. Dollars)

	Year Ended December 31,
	2020		2019
Share Capital
Balance, beginning of year	$	10,270	$	10,290
Repurchase of Common Stock (Note 9)	—		(20)
Balance, end of year	10,270		10,270
Additional Paid in Capital
Balance, beginning of year	1,282,627		1,318,048
Stock-based compensation (Note 9)	2,391		2,120
Repurchase of Common Stock (Note 9)	—		(37,541)
Balance, end of year	1,285,018		1,282,627
Deficit
Balance, beginning of year	(260,287)		(298,588)
Net (loss) income	(777,967)		38,690
Cumulative adjustment for accounting changes related to leases (Note 2)	—		(389)
Balance, end of year	(1,038,254)		(260,287)
Total Shareholders’ Equity	$	257,034	$	1,032,610

(See notes to the consolidated financial statements)

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Gran Tierra Energy Inc.

Notes to the Consolidated Financial Statements

For the Years Ended December 31, 2020 and 2019

(Expressed in U.S. Dollars, unless otherwise indicated)

1. Description of Business

Gran Tierra Energy Inc., a Delaware corporation (the “Company” or “Gran Tierra”), is a publicly traded company focused on international oil and natural gas exploration and production with assets currently in Colombia and Ecuador.

2. Significant Accounting Policies

The consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”).

Significant accounting policies are:

Basis of Consolidation

These consolidated financial statements include the accounts of the Company and its controlled subsidiaries. All intercompany accounts and transactions have been eliminated.

Use of Estimates

The preparation of financial statements in conformity with 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 consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates made by management include: oil and natural gas reserves and related present value of future cash flows; depreciation, depletion, amortization (“DD&A”) and impairment; impairment assessments of goodwill; timing of transfers from oil and gas properties not subject to depletion to the depletable base; asset retirement obligations; determining the value of the consideration transferred and the net identifiable assets acquired and liabilities assumed in connection with business combinations and determining goodwill; assessments of the likely outcome of legal and other contingencies; income taxes; stock-based compensation; and determining the fair value of derivatives. Although management believes these estimates are reasonable, changes in facts and circumstances or discovery of new information may result in revised estimates and actual results may differ from these estimates.

Cash and Cash Equivalents

The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents.

Restricted Cash and Cash Equivalents

Restricted cash and cash equivalents comprises cash and cash equivalents pledged to secure letters of credit and to settle asset retirement obligations. Letters of credit currently secured by cash relate to work commitment guarantees contained in exploration contracts. Restrictions will lapse when work obligations are satisfied pursuant to the exploration contract or an asset retirement obligation is settled. Cash and claims to cash that are restricted as to withdrawal or use for other than current operations or are designated for expenditure in the acquisition or construction of long-term assets are excluded from the current asset classification. The long-term portion of restricted cash and cash equivalents is included in other long-term assets on the Company's balance sheet.

Allowance for Doubtful Accounts

At each reporting date, the Company assesses the expected lifetime credit losses on initial recognition of trade accounts receivable. Credit risk is assessed based on the number of days the receivable has been outstanding and the internal credit assessment of the customer. The expected loss rates are based on payment profiles over a period of 36 months prior to the period-end and the corresponding historical credit losses experienced within this period. Historical loss rates are adjusted to

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reflect current and forward looking economic factors of the country where the Company sells oil that affect the ability of the customers to settle the receivables. Trade receivables are written off when there is no reasonable expectation of recovery.

Investment in PetroTal Corp.

During December 2017, the Company acquired an investment in common shares of PetroTal Corp. ("PetroTal") in connection with the sale of its Peru business unit. At December 31, 2020, this investment represented approximately 30% of PetroTal's issued and outstanding common shares. The Company determined that it did not have a controlling financial interest in PetroTal, but could exert significant influence over PetroTal's operating and financial policies as a result of its ownership interest in PetroTal and the right to nominate two directors to PetroTal's board of directors. Accordingly, Gran Tierra accounted for its investment in the common shares of PetroTal as an equity method investment, but elected the fair value option for this investment to reflect the value that market participants would use to value the investment. The fair value of the investment in PetroTal's common shares is recorded as "Investment" on the Company's consolidated balance sheet, and the change in fair value is recorded in the consolidated statements of operations as financial instruments gains or losses. As at December 31, 2020, we held 246,100,000 common shares of PetroTal and subsequent to December 31, 2020 we disposed of 109,006,250 common shares resulting in 137,093,750 common shares held (17% of all total outstanding shares).

Derivatives

The Company records derivative instruments on its balance sheet at fair value as either an asset or liability with changes in fair value recognized in the consolidated statements of operations as financial instruments gains or losses. While the Company utilizes derivative instruments to manage the price risk attributable to its expected oil production and foreign exchange risk, it has elected not to designate its derivative instruments as accounting hedges under the accounting guidance.

Inventory

Inventory consists of oil in tanks and third party pipelines and supplies and is valued at the lower of cost and net realizable value. The cost of inventory is determined using the weighted average method. Oil inventories include expenditures incurred to produce, upgrade and transport the product to the storage facilities and include operating, depletion and depreciation expenses and cash royalties.

Income Taxes

Income taxes are recognized using the liability method, whereby deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the consolidated financial statements carrying amounts of existing assets and liabilities and their respective tax base, and operating loss and tax credit carry forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences and carryforwards are expected to be recovered or settled. Valuation allowances are provided if, after considering available evidence, it is not more likely than not that some or all of the deferred tax assets will be realized.

The tax benefit from an uncertain tax position is recognized when it is more likely than not, based on the technical merits of the position, that the position will be sustained on examination by the taxing authorities. Additionally, the amount of the tax benefit recognized is the largest amount of benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. In evaluating whether a tax position has met the more-likely-than-not recognition threshold, the Company presumes that the position will be examined by the appropriate taxing authority that has full knowledge of all relevant information. The Company recognizes potential penalties and interest related to unrecognized tax benefits as a component of income tax expense.

Oil and Gas Properties

The Company uses the full cost method of accounting for its investment in oil and natural gas properties as defined by the Securities and Exchange Commission (“SEC”). Under this method, the Company capitalizes all acquisition, exploration and development costs incurred for the purpose of finding oil and natural gas reserves, including salaries, benefits and other internal costs directly attributable to these activities. Costs associated with production and general corporate activities; however, are expensed as incurred. Separate cost centers are maintained for each country in which the Company incurs costs.

The Company computes depletion of oil and natural gas properties on a quarterly basis using the unit-of-production method based upon production and estimates of proved reserve quantities. Future development costs related to properties with proved reserves are also included in the amortization base for computation of depletion. The costs of unproved properties are excluded from the amortization base until the properties are evaluated. The cost of exploratory dry wells is transferred to proved

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properties, and thus is subject to amortization, immediately upon determination that a well is dry in those countries where proved reserves exist.

The Company performs a ceiling test calculation each quarter in accordance with SEC Regulation S-X Rule 4-10. In performing its quarterly ceiling test, the Company limits, on a country-by-country basis, the capitalized costs of proved oil and natural gas properties, net of accumulated depletion and deferred income taxes, to the estimated future net cash flows from proved oil and natural gas reserves discounted at 10%, net of related tax effects, plus the lower of cost or fair value of unproved properties included in the costs being amortized. If such capitalized costs exceed the ceiling, the Company will record a write-down to the extent of such excess as a non-cash charge to net income or loss. Any such write-down will reduce earnings in the period of occurrence and results in a lower DD&A rate in future periods. A write-down may not be reversed in future periods even though higher oil and natural gas prices may subsequently increase the ceiling.

The Company calculates future net cash flows by applying the unweighted average of prices in effect on the first day of the month for the preceding 12-month period, adjusted for location and quality differentials. Such prices are utilized except where different prices are fixed and determinable from applicable contracts for the remaining term of those contracts.

Unproved properties are not depleted pending the determination of the existence of proved reserves. Costs are transferred into the depletable base on an ongoing basis as the properties are evaluated and proved reserves are established or impairment is determined. Unproved properties are evaluated quarterly to ascertain whether impairment has occurred. This evaluation considers, among other factors, seismic data, requirements to relinquish acreage, drilling results and activity, remaining time in the commitment period, remaining capital plans, and political, economic, and market conditions. During any period in which factors indicate an impairment, the cumulative costs incurred to date for such property are transferred to the full cost pool and are then subject to depletion. For countries where a reserve base has not yet been established, the impairment is charged to earnings.

In exploration areas, related seismic costs are capitalized in unproved property and evaluated as part of the total capitalized costs associated with a property. Seismic costs related to development projects are recorded in proved properties and therefore subject to depletion as incurred.

Gains and losses on the sale or other disposition of oil and natural gas properties are not recognized, unless the gain or loss would significantly alter the relationship between capitalized costs and proved reserves of oil and natural gas attributable to a country.

Asset Retirement Obligation

The Company records an estimated liability for future costs associated with the abandonment of its oil and gas properties including the costs of reclamation of drilling sites. The Company records the fair value of a liability for a legal obligation to retire an asset in the period in which the liability is incurred with an offsetting increase to the related oil and gas properties. The fair value of an asset retirement obligation is measured by reference to the expected future cash outflows required to satisfy the retirement obligation discounted at the Company’s credit-adjusted risk-free interest rate. Accretion expense is recognized over time as the discounted liabilities are accreted to their expected settlement value, while the asset retirement cost is amortized over the estimated productive life of the related assets. The accretion of the asset retirement obligation and amortization of the asset retirement cost are included in DD&A. If estimated future costs of an asset retirement obligation change, an adjustment is recorded to both the asset retirement obligation and oil and gas properties. Revisions to the estimated asset retirement obligation can result from changes in retirement cost estimates, revisions to estimated inflation rates and changes in the estimated timing of abandonment.

Other Capital Assets

Other capital assets, including additions and replacements, are recorded at cost upon acquisition and include furniture, fixtures and leasehold improvement, computer equipment, automobiles and right-of-use assets for operating and finance leases. Depreciation for furniture and fixtures, computer equipment and automobiles is provided using the straight-line method over the useful life of the asset. Leasehold improvements and right-of-use assets for operating and finance leases are depreciated on a straight-line basis over the shorter of the estimated useful life and the term of the related lease. The cost of repairs and maintenance is charged to expense as incurred.

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Goodwill

Goodwill represents the excess of the aggregate of the consideration transferred over the net identifiable assets acquired and liabilities assumed. The Company assesses qualitative factors annually, or more frequently if necessary, to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount and whether it is necessary to perform the goodwill impairment test. The impairment test requires allocating goodwill and certain other assets and liabilities to assigned reporting units. The fair value of each reporting unit is estimated and compared with its net book value. An impairment loss is recognized if the estimated fair value of the reporting unit is less than its carrying amount, not exceeding the carrying amount of goodwill allocated to that reporting unit. Because quoted market prices are not available for the Company’s reporting unit, the fair value of the reporting unit is estimated based upon estimated future cash flows of the reporting unit. The goodwill relates entirely to Colombia. The Company performed step 1 of the goodwill impairment test for the year-ended December 31, 2020 which resulted in a full write-down of goodwill.

Leases

At inception of a contract, the Company assesses whether a contract is, or contains, a lease. A contract is, or contains, a lease if the contract conveys the right to control the use of an identified asset for a period of time in exchange for consideration. At inception of a contract that contains a lease component, the Company allocates the consideration in the contract to each lease and non-lease component on the basis of their relative stand-alone prices. The Company recognizes a right-of-use asset and a lease liability at the lease commencement date. The right-of-use asset is initially measured at cost, and subsequently at cost less any accumulated depreciation and impairment losses, and adjusted for certain remeasurements of the lease liability.

The lease liability is initially measured at the present value of the lease payments that are not paid at the commencement date, discounted using the interest rate implicit in the lease or, if that rate cannot be readily determined, the Company's incremental borrowing rate. Generally, the Company uses its incremental borrowing rate as the discount rate. The lease liability is subsequently increased by the interest cost on the lease liability and decreased by lease payments made. It is remeasured when there is a change in future lease payments arising from a change in an index or rate, a change in the estimate of the amount expected to be payable under a residual value guarantee, or as appropriate, changes in the assessment of whether a purchase or extension option is reasonably certain to be exercised or a termination option is reasonably certain not to be exercised.

The Company has applied judgment to determine the lease term for contracts which include renewal or termination options. The assessment of whether the Company is reasonably certain to exercise such options impacts the lease term, which significantly affects the amount of lease liabilities and right-of-use assets recognized.

All leases identified as part of the transition on January 1, 2019 relate to office leases. The transition resulted in the recognition of a right-of-use asset presented in other capital assets of $3.8 million at January 1, 2019, the recognition of lease liabilities of $4.2 million and a $0.4 million impact on retained earnings. When measuring the lease liabilities, the Company's incremental borrowing rate was used. At January 1, 2019 the rates applied ranged between 5.6% and 9.1%.

Revenue from Contracts with Customers

The Company's revenue relates to oil sales in Colombia. The Company recognizes revenue when it transfers control of the product to a customer. This generally occurs at the time the customer obtains legal title to the product and when it is physically transferred to the delivery point agreed with the customer. Payment terms are generally within three business days following delivery of an invoice to the customer. Revenue is recognized based on the consideration specified in contracts with customers. Revenue represents the Company's share and is recorded net of royalty payments to governments and other mineral interest owners.

The Company evaluates its arrangement with third parties and partners to determine if the Company acts as a principal or an agent. In making this evaluation, management considers if the Company obtains control of the product delivered, which is indicated by the Company having the primary responsibility for the delivery of the product, having ability to establish prices or having inventory risk. If the Company acts in the capacity of an agent rather than as a principal in transaction, then the revenue is recognized on a net-basis, only reflecting the fee realized by the Company from the transaction.

Tariffs, tolls and fees charged to other entities for use of pipelines owned by the Company are evaluated by management to determine if these originate from contracts with customers or from incidental arrangements. When determining if the Company acted as a principal or as an agent in transactions, management determines if the Company obtains control of the product. As part of this assessment, management considers criteria for revenue recognition set out in ASC 606.

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Stock-based Compensation

The Company records stock-based compensation expense in its consolidated financial statements measured at the fair value of the awards that are ultimately expected to vest. Fair values are determined using pricing models such as the Black-Scholes-Merton or Monte Carlo simulation stock option-pricing models and/or observable share prices. For equity-settled stock-based compensation awards, fair values are determined at the grant date and the expense, net of estimated forfeitures, is recognized using the accelerated method over the requisite service period. An adjustment is made to compensation expense for any difference between the estimated forfeitures and the actual forfeitures. For cash-settled stock-based compensation awards, fair values are determined at each reporting date and periodic changes are recognized as compensation costs, with a corresponding change to liabilities.

The Company uses historical data to estimate the expected term used in the Black-Scholes option pricing model, option exercises and employee departure behavior. Expected volatilities used in the fair value estimate are based on the historical volatility of the Company’s shares. The risk-free rate for periods within the expected term of the stock options is based on the U.S. Treasury yield curve in effect at the time of grant.

Stock-based compensation expense is capitalized as part of oil and natural gas properties or expensed as part of general and administrative (“G&A”) or operating expenses, as appropriate.

Foreign Currency Translation

The functional currency of the Company, including its subsidiaries, is the United States dollar. Monetary items are translated into the reporting currency at the exchange rate in effect at the balance sheet date and non-monetary items are translated at historical exchange rates. Revenue and expense items are translated in a manner that produces substantially the same reporting currency amounts that would have resulted had the underlying transactions been translated on the dates they occurred.

DD&A expense on assets is translated at the historical exchange rates similar to the assets to which they relate. Gains and losses resulting from foreign currency transactions, which are transactions denominated in a currency other than the entity’s functional currency, are recognized in net income or loss.

Earnings (Loss) per Share

Basic earnings (loss) per share is calculated by dividing net income or loss attributable to common shareholders by the weighted average number of shares of Common Stock and exchangeable shares issued and outstanding during each period. Diluted net income or loss per share is calculated by adjusting the weighted average number of shares of Common Stock and exchangeable shares outstanding for the dilutive effect, if any, of share equivalents. The Company uses the treasury stock method to determine the dilutive effect. This method assumes that all Common Stock equivalents have been exercised at the beginning of the period (or at the time of issuance, if later), and that the funds obtained thereby were used to purchase shares of Common Stock of the Company at the volume weighted average trading price of shares of Common Stock during the period.

Recently Adopted Accounting Pronouncements

Financial Instruments - Credit Losses (ASC 326)

In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses". This ASU replaces the incurred loss impairment methodology with a methodology that reflects expected credit losses and requires a broader range of reasonable and supportable information to support credit loss estimates. In December 2019, the FASB issued ASU 2019-10, "Financial Instruments - Credit Losses, Derivatives and Hedging and Leases", which is codification improvement of ASU 2016-13. The Company adopted this ASU on January 1, 2020, the adoption of which had no material impact on the Company's consolidated balance sheet, results of operations or cash flows.

Risks and Measurement Uncertainty

In March 2020, the outbreak of the COVID-19 virus, which was declared a pandemic by the World Health Organization, has spread across the globe and impacted worldwide economic activity. In addition, global commodity prices declined significantly due to disputes between major oil producing countries combined with the impact of the COVID-19 pandemic and associated reductions in global demand for oil. Governments worldwide, including those in Colombia and Ecuador, the countries where the Company operates, enacted emergency measures to combat the spread of the virus. These measures, which include the implementation of travel bans, self-imposed quarantine periods and physical distancing, caused material disruption to

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businesses globally resulting in an economic slowdown. Governments and central banks have reacted with significant monetary and fiscal interventions designed to stabilize economic conditions; however, the success of these interventions is not currently determinable. The current challenging economic climate is having and may continue to have significant adverse impacts on the Company including, but not exclusively:

•material declines in revenue and cash flows as a result of the decline in commodity prices;

•declines in revenue and operating activities due to reduced capital programs and the shut-in of production;

•impairment charges (see Note 6);

•inability to comply with covenants and restrictions in debt agreements;

•inability to access financing sources;

•increased risk of non-performance by the Company’s customers and suppliers;

•interruptions in operations as the Company adjusts personnel to the dynamic environment; and

•inability to operate or delay in operations as a result COVID-19 restrictions in the countries in which the Company operates.

The unprecedented decline in oil prices has materially reduced the Company’s forecasted EBITDAX and the estimated value of its oil reserves. Based on current forecasted Brent pricing and production levels, which can change materially in very short time frames, the Company is forecasted to be in compliance with the amended financial covenants contained in the Company's Senior Secured Credit Facility (the "revolving credit facility") for at least the next year from the date of these financial statements. The amount available under the Company’s senior secured credit facility is based on the lenders determination of the borrowing base. The borrowing base is determined, by the lenders, based on the Company’s reserves and commodity prices. The next renewal of the borrowing base is scheduled for May 2021 and there is risk that the borrowing base may be reduced by the lenders. In addition, the Company’s ability to borrow under the credit facility may be limited by the terms of the indentures for the 6.25% Senior Notes and 7.75% Senior Notes.

The risk of non-compliance with the covenants in the lending agreements and the risk associated with maintaining the borrowing base is heightened in the current period of volatility coupled with the unprecedented disruption caused by the COVID-19 pandemic. Management currently expects that the Company will continue to meet the terms of the credit facility or obtain further amendments or waivers if and when required. The Company also expects to be able to maintain the borrowing base at a level in excess of the amount borrowed. However, there can be no assurances that the Company’s liquidity can be maintained at or above current levels during this period of volatility and global economic uncertainty.

The situation is dynamic and the ultimate duration and magnitude of the impact on the economy and the financial effect on the Company is not known at this time. Estimates and judgments made by management in the preparation of the financial statements are increasingly difficult and subject to a higher degree of measurement uncertainty during this volatile period. In the near term, matters in these financial statements that are most subject to be impacted by this volatile period are the Company's assessment of liquidity and access to capital, the carrying value of long-lived assets and the valuation of the deferred tax assets.

3. Accounts Receivable

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
Trade	$	3,799	$	24,890
Other	4,245		11,401
Total Accounts Receivable	$	8,044	$	36,291

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4. Taxes Receivable

The table below shows the break-down of taxes receivable which are comprised of value added tax ("VAT") and income tax receivables.

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Current
VAT Receivable	$	35,977	$	92,777
Income Tax Receivable	13,985		43,061
	$	49,962	$	135,838
Long-Term
VAT Receivable	$	28,485	$	25,869
Income Tax Receivable	14,150		—
	$	42,635	$	25,869
Total Taxes Receivable	$	92,597	$	161,707

The following table shows the movement of VAT and income tax receivables for the past two years:

(Thousands of U.S. Dollars)	VAT Receivable		Income Tax Receivable		Total Taxes Receivable
Balance, December 31, 2018	$	72,497	$	1,613	$	74,110
Collected through sales contracts	(18,197)		—		(18,197)
Taxes paid	65,114		58,494		123,608
Current tax expense	—		(17,058)		(17,058)
Foreign exchange loss	(768)		12		(756)
Balance, December 31, 2019	$	118,646	$	43,061	$	161,707
Collected through direct government refunds	(40,884)		(26,471)		(67,355)
Collected through sales contracts	(46,326)		—		(46,326)
Taxes paid	43,719		14,648		58,367
Current tax expense	—		(754)		(754)
Foreign exchange loss	(10,693)		(2,349)		(13,042)
Balance, December 31, 2020	$	64,462	$	28,135	$	92,597

5. Property, Plant and Equipment

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
Oil and natural gas properties
Proved	$	4,106,768	$	3,850,565
Unproved	161,763		310,809
	4,268,531		4,161,374
Other (1)	32,135		30,255
	4,300,666		4,191,629
Accumulated depletion, depreciation and impairment	(3,336,184)		(2,614,236)
	$	964,482	$	1,577,393

(1) The "other" category includes $11.4 million right-of-use assets for operating and finance leases which had a net book value of $4.4 million as at December 31, 2020 (December 31, 2019 - $9.7 million which had a net book value of $5.7 million).

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Depletion and depreciation expense on property, plant and equipment for the year ended December 31, 2020, was $160.8 million (2019 - $220.8 million). A portion of depletion and depreciation expense was recorded as oil inventory in each year.

2019 Acquisitions

On February 20, 2019, the Company acquired 36.2% working interest ("WI") in the Suroriente Block and a 100% WI of the Llanos-5 Block for cash consideration of $79.1 million and a promissory note of $1.5 million included in current accounts payable on the Company's consolidated balance sheet. The cost of the assets was allocated to proved properties using relative fair values.

(Thousands of U.S. Dollars)	2019
Cost of Asset Acquisition:
Cash	$	79,100
Promissory note	1,500
	$	80,600
Allocation of Consideration Paid:
Oil and gas properties
Proved	$	52,530
Unproved	44,768
	97,298
Net working capital (including cash acquired of $5.3 million)	(16,698)
	$	80,600

Unproved Oil and Natural Gas Properties

At December 31, 2020, unproved oil and natural gas properties consist of exploration lands held in Colombia and Ecuador. Unproved oil and natural gas properties are being held for their exploration value and are not being depleted pending determination of the existence of proved reserves. Gran Tierra will continue to assess the unproved properties over the next several years as proved reserves are established and as exploration warrants whether or not future areas will be developed. The Company expects that approximately 100% of costs not subject to depletion at December 31, 2020, will be transferred to the depletable base within the next five years.

The following is a summary of Gran Tierra’s oil and natural gas properties not subject to depletion as at December 31, 2020:

	Costs Incurred in
(Thousands of U.S. Dollars)	2020		2019		Prior to 2019		Total
Acquisition costs - Colombia	$	—	$	5,582	$	32,558	$	38,140
Exploration costs - Colombia	4,652		57,328		56,429		118,409
Exploration costs - Ecuador	2,006		3,208		—		5,214
	$	6,658	$	66,118	$	88,987	$	161,763

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6. Impairment

Asset Impairment

Asset impairment for the years ended December 31, 2020 and 2019, was as follows:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Impairment of oil and gas properties	$	560,344	$	—
Impairment of inventory	4,151		—
	$	564,495	$	—

(i)Oil and gas property impairment

For the year ended December 31, 2020, Gran Tierra recorded ceiling test impairment losses of $560.3 million as a result of lower oil prices. The Company follows the full cost method of accounting for its oil and gas properties. Under this method, the net book value of properties on a country-by-country basis, less related deferred income taxes, may not exceed a calculated “ceiling”. The ceiling is the estimated after-tax future net revenues from proved oil and gas properties, discounted at 10% per year. In calculating discounted future net revenues, oil and natural gas prices are determined using the average price for the 12-month period prior to the ending date of the period covered by the balance sheet, calculated as an unweighted arithmetic average of the first-day-of-the-month price for each month within such period. That average price is then held constant, except for changes which are fixed and determinable by existing contracts. Therefore, ceiling test estimates are based on historical prices discounted at 10% per year and it should not be assumed that estimates of future net revenues represent the fair market value of the Company's reserves. In accordance with GAAP, Gran Tierra used an average Brent price of $43.43 per bbl for the purposes of the December 31, 2020 ceiling test calculations (December 31, 2019 - $64.20 per bbl). There was no ceiling test impairment for the year ended December 31, 2019. Gran Tierra's total proved oil and gas reserves decreased 4% from the prior year.

(ii)Inventory impairment

For the year ended December 31, 2020, the Company recorded $4.2 million, relating to the impairment of oil inventory due to the decline in commodity pricing. There was no inventory impairment for the year ended December 31, 2019.

Goodwill Impairment

For the year ended December 31, 2020, the Company recorded $102.6 million of goodwill impairment relating to its Colombia business unit. The impairment was due to the carrying value of the unit exceeding its fair value as a result of the impact of lower forecasted commodity prices. The estimated fair value of the Colombia business unit for the goodwill impairment test was based on the discounted after-tax cash flows associated with the proved and probable reserves of the reporting unit. There was no goodwill impairment for the year ended December 31, 2019.

7. Accounts Payable and Accrued Liabilities

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Trade	$	70,450	$	151,747
Royalties	1,570		5,758
Employee compensation	1,701		6,861
Other	27,063		31,147
	$	100,784	$	195,513

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8. Debt and Debt Issuance Costs

The Company's debt at December 31, 2020 and 2019, was as follows:

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
6.25% Senior Notes	$	300,000	$	300,000
7.75% Senior Notes	300,000		300,000
Revolving credit facility	190,000		118,000
Unamortized debt issuance costs	(18,124)		(21,081)
Long-term lease obligation (1)	2,894		3,540
Long-term debt	$	774,770	$	700,459

(1) The current portion of the lease obligation has been included in accounts payable and accrued liabilities on the Company's balance sheet and totaled $3.3 million as at December 31, 2020 (December 31, 2019 - $3.3 million).

Senior Notes

At December 31, 2020, the Company had $300.0 million of 7.75% Senior Notes due 2027 (the “7.75% Senior Notes”) and $300.0 million of 6.25% Senior Notes due 2025 (the “6.25% Senior Notes” and, together with the 7.75% Senior Notes, the “Senior Notes”). The Senior Notes are fully and unconditionally guaranteed by the Company and certain subsidiaries of the Company that guarantee its revolving credit facility.

The 7.75% Senior Notes bear interest at a rate of 7.75% per year, payable semi-annually in arrears on May 23 and November 23 of each year, beginning on November 23, 2019. The 7.75% Senior Notes will mature on May 23, 2027, unless earlier redeemed or repurchased.

Before May 23, 2023, the Company may, at its option, redeem all or a portion of the 7.75% Senior Notes at 100% of the principal amount plus accrued and unpaid interest and a “make-whole” premium. Thereafter, the Company may redeem all or a portion of the 7.75% Senior Notes plus accrued and unpaid interest applicable to the date of the redemption at the following redemption prices: 2023 - 103.875%; 2024 - 101.938%; 2025 and thereafter - 100%.

The 6.25% Senior Notes bear interest at a rate of 6.25% per year, payable semi-annually in arrears on February 15 and August 15 of each year, beginning on August 15, 2018. The 6.25% Senior Notes will mature on February 15, 2025, unless earlier redeemed or repurchased.

Before February 15, 2022, the Company may, at its option, redeem all or a portion of the 6.25% Senior Notes at 100% of the principal amount plus accrued and unpaid interest and a make-whole premium. Thereafter, the Company may redeem all or a portion of the 6.25% Senior Notes plus accrued and unpaid interest applicable to the date of the redemption at the following redemption prices: 2022 - 103.125%; 2023 - 101.563%; 2024 and thereafter - 100%.

Credit Facility

At December 31, 2020, the Company had a revolving credit facility with a syndicate of lenders with a borrowing base of $215.0 million. Availability under the revolving credit facility is determined by the reserves-based borrowing base determined by the lenders. During the year, as part of semi-annual redeterminations, the borrowing base was reduced from $300.0 million to $225.0 million on June 1, 2020 and was further reduced to $215.0 million on December 7, 2020. The credit facility matures on November 10, 2022. The next re-determination of the borrowing base is due to occur no later than May 2021.

Management has also obtained a relief from compliance with certain financial covenants until October 1, 2021 (the "covenant relief period"), permitting the ratio of total debt to Covenant EBITDAX ("EBITDAX") to be greater than 4.0 to 1.0, Senior Secured Debt to EBITDAX ratio must not exceed 2.5 to 1.0, and EBITDAX to interest expense ratio for the trailing four quarter periods measured as of the last day of the fiscal quarters ending (i) December 31, 2020 and March 31, 2021, must be at least 1.5 to 1.0 (ii) June 30, 2021 and September 30, 2021 must be at least 2.0 to 1.0, and be at least 2.5 to 1.0 thereafter. The Company is required to comply with various covenants, which as disclosed above, have been modified in response to the current market

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conditions and the COVID-19 pandemic. As of December 31, 2020, the Company was in compliance with all applicable covenants in the revolving credit facility.

Availability for borrowing or issuance of letters of credit during covenant relief period and until June 29, 2021 was reduced by $15.0 million and starting from June 30, 2021 and until the end of covenant relief period by $20.0 million.

After the expiration of covenant relief period, the Company must maintain compliance with the following financial covenants: limitations on Company's ratio of debt to EBITDAX to a maximum of 4.0 to 1.0; limitations on Company's ratio of Senior Secured Debt to EBITDAX to a maximum of 3.0 to 1.0; and the maintenance of a ratio of EBITDAX to interest expense of at least 2.5 to 1.0. If the Company fails to comply with these financial covenants, and relief from compliance with the covenants was not obtained, it would result in a default under the terms of the credit agreement, which could result in an acceleration of repayment of all indebtedness under the Company's revolving credit facility.

Amounts drawn down under the revolving credit facility bear interest, at the Company's option, at the USD LIBOR rate plus a margin ranging from 2.90% to 4.90% (December 31, 2019 - 1.65% to 3.65%), or an alternate base rate plus a margin ranging from 1.90% to 3.90% (December 31, 2019 - 0.65% to 2.65%), in each case based on the borrowing base utilization percentage. The alternate base rate is currently the U.S. prime rate. Undrawn amounts under the revolving credit facility bear interest from 0.73% to 1.23% (December 31, 2019 - 0.41% to 0.91%) per annum, based on the average daily amount of unused commitments.

The Company’s revolving credit facility is guaranteed by and secured against the assets of certain of the Company’s subsidiaries (the "Credit Facility Group"). Under the terms of the credit facility, the Company is subject to certain restrictions on its ability to distribute funds to entities outside of the Credit Facility Group, including restrictions on the ability to pay dividends to shareholders of the Company.

Interest Expense

The following table presents total interest expense recognized in the accompanying consolidated statements of operations:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Contractual interest and other financing expenses	$	50,515	$	39,892
Amortization of debt issuance costs	3,625		3,376
	$	54,140	$	43,268

The Company incurred debt issuance costs in connection with the issuance of the Senior Notes and its revolving credit facility. As at December 31, 2020, the balance of unamortized debt issuance costs has been presented as a direct deduction against the carrying amount of debt and is being amortized to interest expense using the effective interest method over the term of the debt.

9. Share Capital

	Shares of Common Stock
Balance, December 31, 2018	387,079,027
Shares repurchased and canceled	(20,097,471)
Balance, December 31, 2019 and 2020	366,981,556

The Company’s authorized share capital consists of 595,000,000 shares of capital stock, of which 570,000,000 was designated as Common Stock, par value $0.001 per share and 25,000,000 as Preferred Stock, par value $0.001 per share.

Equity Compensation Awards

The Company has an equity compensation program in place for its executives, employees and directors. Executives and employees are given equity compensation grants that vest based on a recipient's continued employment and in the case of Performance Share Units (“PSUs”), the number of units that vest is dependent upon the achievement of certain key

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performance measures. Equity settled awards consist 80% of PSUs and 20% of stock options. The Company’s stock-based compensation awards outstanding as at December 31, 2020, include PSUs, deferred share units (“DSUs”), and stock options.

In accordance with the 2007 Equity Incentive Plan, as amended, the Company’s Board of Directors is authorized to issue options or other rights to acquire shares of the Company’s Common Stock. On June 27, 2012, the shareholders of Gran Tierra approved an amendment to the Company’s 2007 Equity Incentive Plan, which increased the Common Stock available for issuance thereunder from 23,306,100 shares to 39,806,100 shares.

The following table provides information about PSU, DSU and stock option activity for the year ended December 31, 2020:

	PSUs	DSUs	Stock Options
	Number of Outstanding Share Units	Number of Outstanding Share Units	Number of Outstanding Stock Options	Weighted Average Exercise Price /Stock Option ($)
Balance, December 31, 2019	11,371,367	1,251,994	10,612,872	$	2.78
Granted	15,897,575	2,815,903	8,893,140	0.70
Exercised	(2,366,351)	—	—	—
Forfeited	(1,629,187)	—	(1,038,093)	2.04
Expired	—	—	(3,022,970)	3.42
Balance, December 31, 2020	23,273,404	4,067,897	15,444,949	$	1.50
Vested and exercisable, at December 31, 2020			5,443,796	$	2.39
Vested, or expected to vest, at December 31, 2020 through the life of the options			14,938,829	$	1.53

Stock-based compensation expense for the year ended December 31, 2020, was $1.2 million (2019 - $1.4 million) and was primarily recorded in G&A expenses.

At December 31, 2020, there was $5.9 million (December 31, 2019 - $6.7 million) of unrecognized compensation cost related to unvested PSUs and stock options which is expected to be recognized over a weighted average period of 1.7 years. The weighted-average remaining contractual term of options vested, or expected to vest, at December 31, 2020 was 3.2 years.

PSUs

PSUs entitle the holder to receive, at the option of the Company, either the underlying number of shares of the Company's Common Stock upon vesting of such units or a cash payment equal to the value of the underlying shares. PSUs will cliff vest after three years, subject to the continued employment of the grantee. Upon vesting, the underlying number of Common Shares or the cash payment equivalent to their value may range from nil to 200% of the number of PSU's vested, based on the Company’s performance with respect to the applicable performance targets. As at December 31, 2020, 2.7 million (December 31, 2019 - 2.4 million) of PSU's had vested and will be settled in cash. The performance targets for the PSUs outstanding as at December 31, 2020, were as follows:

(i) 50% of the award is subject to targets relating to the total shareholder return (“TSR”) of the Company against a group of

peer companies;

(ii) 25% of the award is subject to targets relating to net asset value ("NAV") of the Company per share and NAV is based on

before tax net present value discounted at 10% of proved plus probable reserves; and

(iii) 25% of the award is subject to targets relating to the execution of corporate strategy.

The compensation cost of PSUs is subject to adjustment based upon the attainability of these performance targets. No settlement will occur with respect to the portion of the PSU award subject to each performance target for results below the applicable minimum threshold for that target. PSUs in excess of the target number granted will vest and be settled if performance exceeds the targeted performance goals. The Company currently intends to settle the PSUs in cash.

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DSUs

DSUs entitle the holder to receive, either the underlying number of shares of the Company's Common Stock upon vesting of such units or, at the option of the Company, a cash payment equal to the value of the underlying shares. Once a DSU is vested, it is immediately settled. During the year ended December 31, 2020, DSUs were granted to directors and will vest 100% at such time the grantee ceases to be a member of the Board of Directors. The Company currently intends to settle the DSUs in cash.

Stock Options

Each stock option permits the holder to purchase one share of Common Stock at the stated exercise price. The exercise price equals the market price of a share of Common Stock at the time of grant. Stock options generally vest over three years. The term of stock options granted starting in May of 2013 is five years or three months after the grantee’s end of service to the Company, whichever occurs first.

For the years ended December 31, 2020 and 2019 , no stock options were exercised and no cash proceeds were received.

At December 31, 2020, the weighted average remaining contractual term of outstanding stock options was 3.2 years, (exercisable stock options - 1.9 years).

The fair value of each stock option award is estimated on the date of grant using the Black-Scholes option pricing model based on assumptions noted in the following table:

	Year Ended December 31,
	2020		2019
Dividend yield (per share)	Nil		Nil
Volatility	50% to 69%		48% to 54%
Weighted average volatility	52	%	51	%
Risk-free interest rate	0.3% to 1.7%		1.5% to 2.5%
Expected term	5 years		4-5 years

The weighted average grant date fair value for options granted in the year ended December 31, 2020 was $0.29 (2019 - $0.89; 2018 - $1.15). The weighted average grant date fair value for options vested in the year ended December 31, 2020 was $0.79 (2019 - $1.10). The total fair value of stock options vested during year ended December 31, 2020 was $1.9 million (2019 - $1.9 million).

Weighted Average Shares Outstanding

	Year Ended December 31,
	2020	2019
Weighted average number of common and exchangeable shares outstanding	366,981,556	376,495,306
Shares issuable pursuant to stock options	—	87,204
Shares assumed to be purchased from proceeds of stock options	—	(74,698)
Weighted average number of diluted common and exchange shares outstanding	366,981,556	376,507,812

For the year ended December 31, 2020, all options, on a weighted average basis, (2019 - 9,465,737 options) were excluded from the diluted (loss) earnings per share calculation as the options were anti-dilutive.

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10. Asset Retirement Obligation

Changes in the carrying amounts of the asset retirement obligation associated with the Company’s oil and natural gas properties were as follows:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Balance, beginning of year	$	43,419	$	43,799
Liability incurred	909		7,034
Settlements	(201)		(846)
Accretion	3,464		3,436
Revisions in estimated liability	623		(10,004)
Balance, end of year	$	48,214	$	43,419

Revisions in estimated liabilities relate primarily to changes in estimates of asset retirement costs and include, but are not limited to, revisions of estimated inflation rates, changes in property lives and the expected timing of settling asset retirement obligations. At December 31, 2020, the fair value of assets that were legally restricted for purposes of settling asset retirement obligations was $3.8 million (December 31, 2019 - $2.8 million). These assets were accounted for as restricted cash and cash equivalents on the Company's balance sheet (Note 16).

11. Revenue

Most of the Company's revenue is generated from oil sales at prices which reflect the blended prices received upon shipment by the purchaser at defined sales points or are defined by contract relative to ICE Brent and adjusted for Vasconia or Castilla crude differentials, and quality and transportation discounts each month. For the year ended December 31, 2020, 100% (2019 - 100%) of the Company's revenue resulted from oil sales and quality and transportation discounts were 25% (2019 - 16%) of the ICE Brent price. During the year ended December 31, 2020, the Company's production was sold primarily to three major customers in Colombia (2019 - three) of which equaled 41%, 31% and 25% of total sales volumes respectively.

As at December 31, 2020, accounts receivable included $0.1 million of accrued sales revenue related to December 2020 production (as at December 31, 2019, $0.1 million related to December 2019 production).

12. COVID-19 Related Costs

The COVID-19 pandemic resulted in extra operating and transportation costs related to COVID-19 health and safety preventative measures including incremental sanitation requirements and enhanced procedures for trucking barrels and crew changes in the field. Below is a break-down of the costs:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Operating expenses	$	2,482	$	—
Transportation costs	197		—
COVID-19 costs	$	2,679	$	—

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13. Taxes

The income tax expense and recovery reported differs from the amount computed by applying the statutory rate to income (loss) before income taxes for the following reasons:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020			2019
Income (loss) before income taxes
United States	$	(19,065)		$	(27,984)
Foreign	(834,296)			123,959
	(853,361)			95,975
Statutory rate (1)	32		%	33		%
Income tax (recovery) expense expected	(273,076)			31,672
Impact of foreign taxes	26,668			9,387
Foreign currency translation	48,734			11,527
Goodwill Impairment	32,826			—
Stock-based compensation	666			430
Change in valuation allowance	75,241			3,429
Non-deductible third party royalty in Colombia	697			2,240
Other permanent differences	5,349			6,082
Non-deductible investment loss (gain) (PetroTal)	7,501			(7,482)
Total income tax (recovery) expense	$	(75,394)		$	57,285
Effective tax rate	9		%	60		%
Current income tax expense
Foreign	754			17,058
	754			17,058
Deferred income tax expense (recovery)
Foreign	(76,148)			40,227
Total income tax (recovery) expense	$	(75,394)		$	57,285

(1) The tax rate is the statutory rate in Colombia.

In general, it is the Company's practice and intention to reinvest the earnings of our non-U.S. subsidiaries in such subsidiaries' operations. As of December 31, 2020, the Company has not made a provision for U.S. or additional foreign withholding taxes on the investments in foreign subsidiaries that are indefinitely reinvested. Generally, such amounts become subject to taxation upon the remittance of dividends and under certain other circumstances.

In the fourth quarter of 2019, the Colombia government enacted a new tax reform to replace the 2018 tax reform, which was overturned by the Colombian Constitutional Court. This new tax reform maintains the same corporate tax rates that were approved by Congress in 2018. The enacted corporate tax rates are 32% for 2020, 31% for 2021 and 30% for 2022 and onwards. The tax rates applied to the calculation of deferred income taxes, before valuation allowances, have been adjusted to reflect these changes.

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	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
Deferred tax assets
Tax benefit of operating loss carryforwards	$	100,616	$	73,096
Tax basis in excess of book basis	37,698		544
Foreign tax credits and other accruals	86,664		76,720
Tax benefit of capital loss carryforwards	27,661		22,710
Deferred tax assets before valuation allowance	252,639		173,070
Valuation allowance	(195,321)		(129,067)
Deferred tax assets - long-term	57,318		44,003
Deferred tax liabilities	—		59,762
Net deferred tax assets (liabilities)	$	57,318	$	(15,759)

At December 31, 2020, the Company has not recognized the benefit of unused non-capital loss carryforwards of $46.0 million (2019 - $50.5 million) for federal purposes in the United States, which expire from 2029 to 2040.

At December 31, 2020, the Company has not recognized the benefit of unused non-capital loss carryforwards of $33.1 million (2019 - $31.5 million) for federal and provincial purposes in Canada, which expire from 2029 to 2039. The Company has not recognized the benefit of capital loss carry forwards of $240.5 million (2019 - $197.5 million) for federal and provincial purposes in Canada which can be carried forward indefinitely.

At December 31, 2020, the Company has recognized the benefit of unused non-capital loss carryforwards of $115.6 million (2019 - $140.5 million), out of a total of $252.0 million and tax credits of $1.0 million (2019 - $1.5 million), out of a total of $3.9 million, for federal purposes in Colombia. As a result of the 2016 Colombian Tax Reform, Colombian losses can be carryforward for a period of 12 years, and not indefinitely as under the previous tax regime. There is a grandfathering rule for losses incurred prior to 2017, which may continue to be carried forward indefinitely. Colombian losses of $33.7 million can be carried forward indefinitely and $218.3 million are entitled to a carryforward period of 12 years.

As at December 31, 2020 and 2019, Gran Tierra had no unrecognized tax benefits and related interest and penalties included in its deferred and current tax liabilities in the consolidated balance sheet. The Company does not anticipate any material changes with respect to unrecognized tax benefit within the next twelve months. The Company had no other significant interest or penalties related to taxes included in the consolidated statement of operations for the quarter ended December 31, 2020. The Company and its subsidiaries file income tax returns in the U.S. and certain other foreign jurisdictions. The Company is subject to income tax examinations for the tax years ended 2012 through 2020 in certain jurisdictions.

In the fourth quarter of 2019, $1.4 million of value added tax receivable was written-off mainly as a result of internal restructuring of our Colombian entities.

14. Commitments and Contingencies

Purchase Obligations, Firm Agreements and Leases

As at December 31, 2020, future minimum payments under non-cancelable agreements with remaining terms in excess of one year were as follows:

	Year ending December 31
(Thousands of U.S. Dollars)	Total		2021		2022		2023		2024		2025		Thereafter
Operating leases (1)	4,910		2,330		2,077		503		—		—		—
Finance leases (1)	4,725		3,197		1,444		57		27		—		—
Software and Telecommunication	900		300		300		300		—		—		—
	$	10,535	$	5,827	$	3,821	$	860	$	27	$	—	$	—

(1) Including maintenance and operating costs.

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Gran Tierra has operating leases for office spaces and finance leases for water flood facilities and storage tanks and commitments relating to compressors, vehicles, equipment and housing.

Indemnities

Corporate indemnities have been provided by the Company to directors and officers for various items including, but not limited to, all costs to settle suits or actions due to their association with the Company and its subsidiaries and/or affiliates, subject to certain restrictions. The Company has purchased directors’ and officers’ liability insurance to mitigate the cost of any potential future suits or actions. The maximum amount of any potential future payment cannot be reasonably estimated. The Company may provide indemnifications in the normal course of business that are often standard contractual terms to counterparties in certain transactions such as purchase and sale agreements. The terms of these indemnifications will vary based upon the contract, the nature of which prevents the Company from making a reasonable estimate of the maximum potential amounts that may be required to be paid.

Letters of Credit

At December 31, 2020, the Company had provided letters of credit and other credit support totaling $100.6 million (December 31, 2019 - $120.6 million) as security relating to work commitment guarantees contained in exploration contracts in Colombia and Ecuador and other capital or operating requirements.

Contingencies

Gran Tierra has a number of lawsuits and claims pending including a dispute with the ANH relating to the calculation of HPR royalties. Although the outcome of these other lawsuits and disputes cannot be predicted with certainty, Gran Tierra believes the resolution of these matters would not have a material adverse effect on the Company’s consolidated financial position, results of operations or cash flows. Gran Tierra records costs as they are incurred or become probable and determinable.

15. Financial Instruments, Fair Value Measurement, Credit Risk and Foreign Exchange Risk

Financial Instruments

At December 31, 2020, the Company’s financial instruments recognized in the balance sheet consist of cash and cash equivalents, restricted cash and cash equivalents, accounts receivable, investment, derivatives, accounts payable and accrued liabilities, long-term debt, current and long-term equity compensation reward liability and other long-term liabilities.

Fair Value Measurement

The fair value of investment, derivatives and PSU liabilities is being remeasured at the estimated fair value at the end of each reporting period.

The fair value of the Company's investment in PetroTal was estimated to be $48.3 million and $94.7 million as at December 31, 2020 and 2019, respectively, based on the closing stock price of PetroTal of $0.20 ($0.25 CAD) and $0.38 ($0.50 CAD) per share as at December 31, 2020 and 2019, respectively.

The fair value of commodity price and foreign currency derivatives is estimated based on various factors, including quoted market prices in active markets and quotes from third parties. The Company also performs an internal valuation to ensure the reasonableness of third party quotes. In consideration of counterparty credit risk, the Company assessed the possibility of whether the counterparty to the derivative would default by failing to make any contractually required payments. Additionally, the Company considers that it is of substantial credit quality and has the financial resources and willingness to meet its potential repayment obligations associated with the derivative transactions.

The fair value of the PSU liability was estimated based on option pricing model using the inputs, such as quoted market prices in an active market, and PSU performance factor.

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The fair value of investment, derivatives, PSU and DSU liabilities at December 31, 2020 and December 31, 2019 were as follows:

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
Investment	$	48,323	$	94,741
Derivative liability	$	12,050	$	775
PSU and DSU liability	4,760		7,859
	$	16,810	$	8,634

The following table presents gains or losses on financial instruments recognized in the accompanying consolidated statements of operations:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Commodity price derivative (gain) loss	$	(220)	$	3,642
Foreign currency derivative loss	3,155		27
Investment loss (gain)	46,883		(49,884)
Financial instruments loss	1,164		—
	$	50,982	$	(46,215)

These gains or losses are presented as financial instruments gains or losses in the consolidated statements of operations and cash flows.

GAAP establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. This hierarchy consists of three broad levels. Level 1 inputs consist of quoted prices (unadjusted) in active markets for identical assets and liabilities and have the highest priority. Level 2 and 3 inputs are based on significant other observable inputs and significant unobservable inputs, respectively, and have lower priorities. The Company uses appropriate valuation techniques based on the available inputs to measure the fair values of assets and liabilities.

Financial instruments not recorded at fair value at December 31, 2020 include the Senior Notes and the Revolving Credit Facility (Note 8). At December 31, 2020, the carrying amounts of the 6.25% Senior Notes and 7.75% Senior Notes were $292.3 million and $290.9 million, respectively, which represents the aggregate principal amount less unamortized debt issuance costs, and the fair values were $205.5 million and $206.9 million. The fair value of the Revolving Credit Facility approximates its carrying value. The fair value of the Senior Notes is determined based on quoted market prices considered Level 1 inputs. The fair value of the Revolving Credit Facility is estimated based on the amount the Company would have to pay a third party to assume the debt, including the credit spread for the difference between the issue rate and the period end market rate. The credit spread is the Company's default or repayment risk. The credit spread (premium or discount) is determined by comparing the debt to new issuances (secured or unsecured) and secondary trades of similar size and credit statistics for both public and private debt. The fair value of the Revolving Credit Facility was estimated using level 2 inputs.

The fair value of long-term restricted cash and cash equivalents and the revolving credit facility approximated their carrying value because interest rates are variable and reflective of market rates. The fair values of other financial instruments approximate their carrying amounts due to the short-term maturity of these instruments.

At December 31, 2020, the fair value of the investment and DSU liability was determined using Level 1 inputs and the fair value of derivatives and PSUs was determined using Level 2 inputs.

The Company’s non-recurring fair value measurements include asset retirement obligations. The fair value of an asset retirement obligation is measured by reference to the expected future cash outflows required to satisfy the retirement obligation discounted at the Company’s credit-adjusted risk-free interest rate. The significant level 3 inputs used to calculate such liabilities include estimates of costs to be incurred, the Company’s credit-adjusted risk-free interest rate, inflation rates and estimated dates of abandonment. Accretion expense is recognized over time as the discounted liabilities are accreted to their expected settlement value, while the asset retirement cost is amortized over the estimated productive life of the related assets.

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Commodity Price Risk

The Company may at time utilize commodity price derivatives to manage the variability in cash flows associated with the forecasted sale of its oil production, reduce commodity price risk and provide a base level of cash flow in order to assure it can execute at least a portion of its capital spending. As at December 31, 2020, the Company had outstanding commodity price derivative positions as follows:

Period and Type of Instrument	Volume, bopd	Reference	Sold Put ($/bbl, Weighted Average)	Purchased Put ($/bbl, Weighted Average)	Sold Call ($/bbl, Weighted Average)	Premium ($/bbl, Weighted Average)
Three-way Collars: January 1, to June 30, 2021	14,000	ICE Brent	36.43	45.14	51.45	0.21
Collars: January 1, to June 30, 2021	1,000	ICE Brent	n/a	45.00	50.40	n/a
Swaptions: July 1, to December 31, 2021	3,000	ICE Brent	n/a	n/a	56.75	n/a

Subsequent to year end, the Company entered into the following commodity price derivative positions:

Period and Type of Instrument	Volume, bopd	Reference	Sold Put ($/bbl, Weighted Average)	Purchased Put ($/bbl, Weighted Average)	Sold Call ($/bbl, Weighted Average)	Premium ($/bbl, Weighted Average)
Three-way Collars: July 1, to December 31, 2021	4,000	ICE Brent	45.00	55.00	68.00	n/a

Foreign Exchange Risk

The Company is exposed to foreign exchange risk in relation to its Colombian operations predominantly in operating costs, general and administrative costs and transportation costs. To mitigate exposure to fluctuations in foreign exchange, the Company may enter into foreign exchange derivatives. As at December 31, 2020 the Company had no outstanding foreign currency derivative positions. Subsequent to year end, the Company entered into the following foreign currency derivative positions:

Period and Type of Instrument	Amount Hedged (Millions of COP)	U.S. Dollar Equivalent of Amount Hedged (Thousands of U.S. Dollars)(1)	Reference	Floor Price (COP, Weighted Average)	Cap Price (COP, Weighted Average)
Collars: March 1, to December 31, 2021	10,000	3,051	COP	3,500	3,630

(1) At December 31, 2020 foreign exchange rate.

Unrealized foreign exchange gains and losses primarily result from fluctuation of the U.S. dollar to the Colombian peso and Canadian dollar due to Gran Tierra’s current and deferred tax assets, taxes receivable and investment, which are monetary assets and liabilities mainly denominated in the local currencies. As a result, foreign exchange gains and losses must be calculated on conversion to the U.S. dollar functional currency. A strengthening in one Colombian peso against the U.S. dollar results in foreign exchange gain of approximately $12,000 on deferred tax asset balance and a foreign exchange gain of approximately $26,000 on taxes receivable. The strengthening of one Canadian cent against the U.S. dollar results in foreign exchange gain of $0.4 million on investment balance. This effect was calculated based on the Company's December 31, 2020, deferred tax asset and investment balances.

For the years ended December 31, 2020 and 2019, respectively, 100% of the Company's oil sales were generated in Colombia. In Colombia, the Company receives 100% of its revenues in U.S. dollars and the majority of its capital expenditures are in U.S. dollars or are based on U.S. dollar prices.

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Credit Risk

Credit risk arises from the potential that the Company may incur a loss if counterparty to a financial instrument fails to meet its obligation in accordance with agreed terms. The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, restricted cash and accounts receivable. The carrying value of cash and cash equivalents, restricted cash and accounts receivable reflects management’s assessment of credit risk.

At December 31, 2020, cash and cash equivalents and restricted cash included balances in bank accounts, term deposits and certificates of deposit, placed with financial institutions with investment grade credit ratings.

Most of the Company’s accounts receivable relate to sales to customers in the oil and natural gas industry and are exposed to typical industry credit risks. The concentration of revenues in a single industry affects the Company’s overall exposure to credit risk because customers may be similarly affected by changes in economic and other conditions. The Company manages this credit risk by entering into sales contracts with only credit worthy entities and reviewing its exposure to individual entities on a regular basis and obtaining letters of credits from customers which amounted to $8.9 million as of December 31, 2020. For the years ended December 31, 2020 and 2019, respectively, the Company had three customers which were over 10% of sales.

To reduce the concentration of exposure to any individual counterparty, the Company utilizes a group of investment-grade rated financial institutions for its derivative transactions. The Company monitors counterparty creditworthiness on an ongoing basis; however, it cannot predict sudden changes in counterparties’ creditworthiness. In addition, even if such changes are not sudden, the Company may be limited in its ability to mitigate an increase in counterparty credit risk. Should one of these counterparties not perform, the Company may not realize the benefit of some of its derivative instruments.

16. Supplemental Cash Flow Information

The following table provides a reconciliation of cash, cash equivalents and restricted cash and cash equivalents with the Company's consolidated balance sheet that sum to the total of the same such amounts shown in the consolidated statements of cash flows:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Cash and cash equivalents	$	13,687	$	8,301
Restricted cash and cash equivalents - current	427		516
Restricted cash and cash equivalents - long-term (1)	3,409		2,258
	$	17,523	$	11,075

(1) The long-term portion of restricted cash is included in other long-term assets on the Company's balance sheet.

Net changes in assets and liabilities from operating activities were as follows:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Accounts receivable and other long-term assets	$	27,607	$	(5,680)
Derivatives	2,302		(638)
Inventory	(2,628)		(3,179)
Other prepaids	(279)		583
Accounts payable and accrued and other long-term liabilities	(47,194)		(1,367)
Prepaid tax and taxes receivable and payable	56,254		(83,593)
Net changes in assets and liabilities from operating activities	$	36,062	$	(93,874)

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The following table provides additional supplemental cash flow disclosures:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Cash paid for income taxes	$	15,476	$	49,196
Cash paid for interest	$	50,209	$	37,767
Non-cash investing activities
Net liabilities related to property, plant and equipment, end of year	$	28,711	$	77,353

17. Subsequent Events

Subsequent to December 31, 2020, the Company sold 44% percent (109,006,250 common shares) of its interest in PetroTal for cash proceeds of $14.9 million resulting in a loss on sale of $5.1 million.

Supplementary Data (Unaudited)

1) Oil and Gas Producing Activities

In accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification Topic 932, “Extractive Activities—Oil and Gas”, and regulations of the U.S. Securities and Exchange Commission (SEC), the Company is making certain supplemental disclosures about its oil and gas exploration and production operations.

A. Estimated Proved NAR Reserves

The following table sets forth Gran Tierra's estimated proved NAR reserves and total net proved developed and undeveloped reserves as of December 31, 2018, 2019 and 2020, and the changes in total net proved reserves during the two-year period ended December 31, 2020.

The net proved reserves represent management’s best estimate of proved oil and natural gas reserves after royalties. Reserve estimates for each property are prepared internally each year and 100% of the reserves at December 31, 2020, have been evaluated by independent qualified reserves consultants, McDaniel & Associates Consultants Ltd.

The reserve estimation process requires us to use significant decisions and assumptions in the evaluation of available geological, geophysical, engineering and economic data for each property, and demonstrate reasonable certainty that they are recoverable from known reservoirs under economic and operating conditions that existed at year end. The determination of oil and natural gas reserves is complex and requires significant judgment. Assumptions used to estimate reserve information may significantly increase or decrease such reserves in future periods. The estimates of reserves are subject to continuing changes and, therefore, an accurate determination of reserves may not be possible for many years because of the time needed for development, drilling, testing, and studies of reservoirs. The process of estimating oil and gas reserves is complex and requires significant judgment, as discussed in Item 1A “Risk Factors”. See “Critical Accounting Policies and Estimates” in Item 7 “Management's Discussion and Analysis of Financial Condition and Results of Operations” for a description of Gran Tierra’s reserves estimation process.

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	Colombia
	Liquids (1)	Gas
	(Mbbl)	(MMcf)
Proved NAR Reserves, December 31, 2018	53,922	2,182
Purchases of reserves in place	4,495	—
Extensions	6,106	—
Technical revisions	13,336	73
Production	(10,530)	(361)
Proved NAR Reserves, December 31, 2019	67,329	1,894
Improved Recoveries	961	—
Extensions	879	—
Technical revisions	2,477	(40)
Production	(6,954)	(199)
Proved NAR Reserves, December 31, 2020	64,692	1,655
Proved Developed Reserves NAR, December 31, 2018	36,805	1,253
Proved Developed Reserves NAR, December 31, 2019	36,465	1,008
Proved Developed Reserves NAR, December 31, 2020	38,660	633
Proved Undeveloped Reserves NAR, December 31, 2018	17,117	929
Proved Undeveloped Reserves NAR, December 31, 2019	30,864	886
Proved Undeveloped Reserves NAR, December 31, 2020	26,032	1,022

(1) At December 31, 2020, 2019, and 2018, liquids reserves are 100% oil.

Changes in proved reserves during the year ended December 31, 2020 shown in the table above primarily resulted from the following significant factors:

Improved Recoveries. Added 1.0 MMBOE of proved reserves, during the year ended December 31, 2020, which were attributed to improved recoveries of heavy oil in the Acordionero field.

Extensions. Added 0.9 MMBOE of proved reserves, during the year ended December 31, 2020, which were attributed to extensions of 0.4 MMBOE in the Acordionero field and 0.5 MMBOE in the Costayaco field.

Technical and Economic Revisions. Added 2.5 MMBOE of proved reserves, during the year ended December 31, 2020, primarily related to positive technical revisions, based on performance and waterflood response, in the Acordionero, Costayaco, Moqueta and Cohembi fields.

B. Capitalized Costs

Capitalized costs for Gran Tierra's oil and gas producing activities consisted of the following at the end of each of the years in the two-year period ended December 31, 2020:

(Thousands of U.S. Dollars)	Proved Properties		Unproved Properties		Accumulated Depletion, Depreciation and Impairment		Net Capitalized Costs
Balance, December 31, 2020	$	4,106,768	$	161,763	$	(3,309,413)	$	959,118
Balance, December 31, 2019	$	3,850,565	$	310,809	$	(2,591,631)	$	1,569,743

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C. Costs Incurred

The following table presents costs incurred for Gran Tierra's oil and gas property acquisitions and exploration and development for the respective years:

(Thousands of U.S. Dollars)	Total
Year Ended December 31, 2020
Property acquisition costs
Proved	$	—
Unproved	$	—
Exploration costs	$	12,852
Development costs	$	92,773
Year Ended December 31, 2019
Property acquisition costs
Proved	$	53,650
Unproved	$	48,648
Exploration costs	$	97,648
Development costs	$	281,151

D. Results of Operations for Oil and Gas Producing Activities

(Thousands of U.S. Dollars)	Colombia
December 31, 2020
Oil sales	$	237,838
Production costs	(122,431)
Exploration expenses	—
DD&A expenses	(164,013)
Asset impairment	(564,495)
Income tax expense	75,394
Results of Operations	$	(537,707)
December 31, 2019
Oil sales	$	570,983
Production costs	(203,604)
Exploration expenses	—
DD&A expenses	(224,045)
Asset impairment	—
Income tax expense	(53,989)
Results of Operations	$	89,345

E. Standardized Measure of Discounted Future Net Cash Flows and Changes

The following disclosure is based on estimates of net proved reserves and the period during which they are expected to be produced. Future cash inflows are computed by applying the twelve month period unweighted arithmetic average of the price as of the first day of each month within that twelve month period, unless prices are defined by contractual arrangements, excluding

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escalations based on future conditions to Gran Tierra’s after royalty share of estimated annual future production from proved oil and gas reserves.

	Colombia
Twelve month period unweighted arithmetic average of the wellhead price as of the first day of each month within the twelve month period
2020	$	35.33
2019	$	54.05
Weighted average production costs
2020	$	12.90
2019	$	18.67

Future development and production costs to be incurred in producing and further developing the proved reserves are based on year end cost indicators. Future income taxes are computed by applying year end statutory tax rates. These rates reflect allowable deductions and tax credits, and are applied to the estimated pre-tax future net cash flows. Discounted future net cash flows are calculated using 10% mid-year discount factors. The calculations assume the continuation of existing economic, operating and contractual conditions. However, such arbitrary assumptions have not proved to be the case in the past. Other assumptions could give rise to substantially different results.

The Company believes this information does not in any way reflect the current economic value of its oil and gas producing properties or the present value of their estimated future cash flows as:

•no economic value is attributed to probable and possible reserves;

•use of a 10% discount rate is arbitrary; and

•prices change constantly from the twelve-month period unweighted arithmetic average of the price as of the first day of each month within that twelve-month period.

The standardized measure of discounted future net cash flows from Gran Tierra's estimated proved oil and gas reserves is as follows:

(Thousands of U.S. Dollars)	Colombia
December 31, 2020
Future cash inflows	$	2,329,016
Future production costs	(929,591)
Future development costs	(252,347)
Future asset retirement obligations	(43,455)
Future income tax expense	(104,311)
Future net cash flows	999,312
10% discount	(271,825)
Standardized Measure of Discounted Future Net Cash Flows	$	727,487
December 31, 2019
Future cash inflows	$	3,711,517
Future production costs	(1,429,689)
Future development costs	(351,750)
Future asset retirement obligations	(46,922)
Future income tax expense	(288,088)
Future net cash flows	1,595,068
10% discount	(406,872)
Standardized Measure of Discounted Future Net Cash Flows	$	1,188,196

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Changes in the Standardized Measure of Discounted Future Net Cash Flows

The following table summarizes changes in the standardized measure of discounted future net cash flows for Gran Tierra's proved oil and gas reserves during two years ended December 31, 2020:

(Thousands of U.S. Dollars)	2020		2019
Balance, beginning of year	$	1,188,196	$	1,194,460
Sales and transfers of oil and gas produced, net of production costs	(442,826)		(595,872)
Net changes in prices and production costs related to future production	(813,627)		(387,603)
Extensions, discoveries and improved recovery, less related costs	47,271		200,486
Previously estimated development costs incurred during the year	(150,644)		155,287
Revisions of previous quantity estimates	700,106		731,352
Accretion of discount	118,820		119,446
Purchases of reserves in place	—		98,244
Net change in income taxes	128,265		(92,527)
Changes in future development costs	(48,074)		(235,077)
Net decrease	(460,709)		(6,264)
Balance, end of year	$	727,487	$	1,188,196

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

Disclosure Controls and Procedures

We have established disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, or Exchange Act). Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of the design and operation of our disclosure controls and procedures as of the end of the period covered by this report, as required by Rule 13a-15(b) of the Exchange Act. Based on their evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that Gran Tierra's disclosure controls and procedures were effective as of December 31, 2020, to provide reasonable assurance that the information required to be disclosed by Gran Tierra in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC rules and forms and that such information is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

Management’s Annual Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting for Gran Tierra, as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act. Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, conducted an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 2020 based on the framework in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission in 2013 (the “2013 COSO Framework”). Based on this evaluation under the 2013 COSO Framework, management concluded that our internal control over financial reporting was effective as of December 31, 2020. The effectiveness of our internal control over financial reporting as of December 31, 2020 has been audited by KPMG LLP, an independent registered public accounting firm, which audited our financial statements included in this Annual Report on Form 10-K as stated in their report which appears herein.

Changes in Internal Controls over Financial Reporting

There were no changes in our internal controls over financial reporting during the three months ended December 31, 2020, that have materially affected, or are reasonably likely to materially affect our internal controls over financial reporting.

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Report of Independent Registered Public Accounting Firm

To the Shareholders and Board of Directors of Gran Tierra Energy Inc.:

Opinion on Internal Control Over Financial Reporting

We have audited Gran Tierra Energy Inc.’s (the Company) 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. In our opinion, the Company maintained, in all material respects, effective 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.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 2020 and 2019, the related consolidated statements of operations, shareholders’ equity, and cash flows for each of the years then ended, and the related notes (collectively, the consolidated financial statements), and our report dated February 24, 2021 expressed an unqualified opinion on those consolidated financial statements.

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 Annual Report on Internal Control over Financial Reporting. 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 of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included 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 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.

/s/ KPMG LLP

Chartered Professional Accountants

Calgary, Canada

February 24, 2021

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Item 9B. Other Information

The Board of Directors of Gran Tierra Energy Inc. has established May 5, 2021 as the date of the Company’s 2021 Annual Meeting of Stockholders (the “2021 Annual Meeting”) and March 9, 2021 as the record date for determining stockholders entitled to notice of, and to vote at, the 2021 Annual Meeting. The time and location of the 2021 Annual Meeting will be as set forth in the Company’s proxy materials for the 2021 Annual Meeting.

PART III

Item 10. Directors, Executive Officers and Corporate Governance

The information required regarding our directors is incorporated herein by reference from the information contained in the section entitled “Proposal 1 - Election of Directors” in our definitive Proxy Statement for the 2021 Annual Meeting of Stockholders (our “Proxy Statement”), a copy of which will be filed with the SEC within 120 days after December 31, 2020. For information with respect to our executive officers, see “Information About Our Executive Officers” at the end of Part I of this report, following Item 4 “Mine Safety Disclosures”.

The information required regarding Section 16(a) beneficial ownership reporting compliance, if applicable, is incorporated by reference from the information contained in the section entitled “Delinquent Section 16(a) Reports” in our Proxy Statement.

The information required with respect to procedures by which security holders may recommend nominees to our Board of Directors, the composition of our Audit Committee, and whether we have an “audit committee financial expert”, is incorporated by reference from the information contained in the section entitled “Proposal 1 - Election of Directors” in our Proxy Statement.

Adoption of Code of Ethics

Gran Tierra has adopted a Code of Business Conduct and Ethics (the “Code”) applicable to all of its Board members, employees and executive officers, including its President and Chief Executive Officer, Director (Principal Executive Officer), and Chief Financial Officer and Executive Vice President, Finance (Principal Financial and Accounting Officer). Gran Tierra has made the Code available on its website at www.grantierra.com.

Gran Tierra intends to satisfy the public disclosure requirements regarding (1) any amendments to the Code, or (2) any waivers under the Code given to Gran Tierra’s (Principal Executive Officer) and (Principal Financial and Accounting Officer) by posting such information on its website at http://www.grantierra.com/governance.html within four business days of such amendment or waiver. Information on our website is not incorporated into this Annual Report or otherwise made part of this Annual Report.

Item 11. Executive Compensation

The information required regarding the compensation of our directors and executive officers is incorporated herein by reference from the information contained in the section entitled “Executive Compensation and Related Information” in our Proxy Statement, including under the subheadings “Director Compensation,” “Compensation Committee Report” and “Compensation Committee Interlocks and Insider Participation”.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

Security Ownership of Certain Beneficial Owners and Management

The information required regarding security ownership of our 10% or greater stockholders and of our directors and management is incorporated herein by reference from the information contained in the section entitled “Security Ownership of Certain Beneficial Owners and Management” in our Proxy Statement.

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The following table provides certain information with respect to securities authorized for issuance under Gran Tierra’s equity compensation plans in effect as of the end of December 31, 2020:

Plan category	(a) Number of securities to be issued upon exercise of outstanding options (1)	(b) Weighted average exercise price of outstanding options	(c) Number of securities remaining available for future issuance under equity compensation plans, excluding securities reflected in column (a) (2)
Equity compensation plans approved by security holders	15,444,949	1.50	7,223,817
Equity compensation plans not approved by security holders	—	—	—
	15,444,949	1.50	7,223.817

(1) Includes shares reserved to be issued pursuant to stock options granted pursuant to the 2007 Equity Incentive Plan ("the Plan"), which is an amendment and restatement of our 2005 Equity Incentive Plan. This does not include any shares reserved to be issued relating to performance stock units ("PSU's"), and deferred share units (DSU's"), which may be settled in cash or in shares of our common stock at our election, and for which management's intent to cash settle is reflected in the financial statement classification of these awards as financial liabilities.

(2) In accordance with Item 201(d) of Regulation S-K, the figure in this column represents the total number of shares of our common stock remaining available for issuance under the Plan as of December 31, 2020, minus the awards reported in column (a), above. Note, pursuant to the terms of the Plan, the pool of shares available for grant thereunder is not actually reduced until an award is settled in shares of our common stock (as opposed to reducing the pool at the time of grant). At December 31, 2020, 27,341,301 shares were issued and outstanding relating to PSUs and DSUs and, after application of the fungible factor of 1.55, these outstanding awards would represent a 42,379,017 reduction to the securities remaining available for future issuance under the Plan if such awards were to be equity settled. Consistent with accounting treatment that reflects management's intent to cash settle, these amounts are not included in the above table as a reduction in the securities remaining available for future issuance. Pursuant to the provisions of the Plan, the number of securities remaining available for issuance is reduced by the aggregate balance of (i) stock options exercised and outstanding at a fungible factor of 1.0 shares and (ii) unit based awards at a fungible factor of 1.55 shares for each share of our common stock issued pursuant to any equity settled awards granted under the Plan. Accordingly, the number of shares available for future awards under the Plan may be different than the amount shown in this column. 

The only equity compensation plan approved by our stockholders is our 2007 Equity Incentive Plan, which is an amendment and restatement of our 2005 Equity Plan.

Item 13. Certain Relationships and Related Transactions, and Director Independence

The information required regarding related transactions is incorporated herein by reference from the information contained in the section entitled “Certain Relationships and Related Transactions” and, with respect to director independence, the section entitled “Proposal 1 - Election of Directors”, in our Proxy Statement.

Item 14. Principal Accounting Fees and Services

The information required is incorporated herein by reference from the information contained in the sections entitled “Principal Accountant Fees and Services” and “Pre-Approval Policies and Procedures” in the proposal entitled “Ratification of Selection of Independent Auditors” in our Proxy Statement.

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PART IV

Item 15. Exhibits, Financial Statement Schedules

(a) The following documents are filed as part of this Annual Report on Form 10-K:

(1) Financial Statements

	Page
Report of Independent Registered Public Accounting Firm	55
Consolidated Statements of Operations	58
Consolidated Balance Sheets	59
Consolidated Statements of Cash Flow	60
Consolidated Statements of Shareholders’ Equity	61
Notes to the Consolidated Financial Statements	62
Supplementary Data (Unaudited)	82

(2) Financial Statement Schedules

None.

(3) Exhibits

Exhibit No.	Description	Reference
2.2	Plan of Conversion, dated October 31, 2016.	Incorporated by reference to Exhibit 2.1 to the Current Report on Form 8-K, filed with the SEC on November 4, 2016 (SEC File No. 001-34018).
3.1	Certificate of Incorporation.	Incorporated by reference to Exhibit 3.3 to the Current Report on Form 8-K, filed with the SEC on November 4, 2016 (SEC File No. 001-34018).
3.2	Bylaws of Gran Tierra Energy Inc.	Incorporated by reference to Exhibit 3.4 to the Current Report on Form 8-K, filed with the SEC on November 4, 2016 (SEC File No. 001-34018).
3.3	Certificate of Retirement of Special A Voting Stock and Special B Voting Stock of Gran Tierra Energy Inc.	Incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K, filed with the SEC on July 9, 2018 (SEC File No. 001-34018).
4.1	Indenture related to the 5.00% Convertible Senior Notes due 2021, dated as of April 6, 2016, between Gran Tierra Energy Inc. and U.S. Bank National Association.	Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K, filed with the SEC on April 6, 2016 (SEC File No. 001-34018).
4.2	Form of 5.00% Convertible Senior Notes due 2021.	Incorporated by reference in Exhibit A to Exhibit 4.1 to the Current Report on Form 8-K, filed with the SEC on April 6, 2016 (SEC File No. 001-34018).
4.3	Subscription Receipt Agreement, dated July 8, 2016, by and between Gran Tierra Energy Inc. and Computershare Trust Company of Canada.	Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K, filed with the SEC on July 14, 2016 (SEC File No. 001-34018).
4.4	Form of Registration Rights Agreement.	Incorporated by reference to Exhibit 4.2 to the Current Report on Form 8-K, filed with the SEC on July 14, 2016 (SEC File No. 001-34018).
4.5	Indenture related to the 6.25% Senior Notes due 2025, dated as of February 15, 2018, between Gran Tierra Energy International Holdings Ltd., the Guarantors named therein and U.S. Bank National Association.	Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K filed with the SEC on February 16, 2018 (SEC File No. 001-34018).

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4.6	First Supplemental Indenture related to 6.25% Senior Notes due 2025, dated as of July 23, 2019, among Gran Tierra Energy Inc., the guarantors named therein, and U.S. Bank National Association.	Incorporated by reference to Exhibit 10.3 to the Quarterly Report on Form 10-Q, filed with the SEC on August 8, 2019 (SEC File No. 001-34018).
4.7	Form of 6.25% Senior Notes due 2025.	Incorporated by reference to Exhibit 4.2 to the Current Report on Form 8-K filed with the SEC on February 16, 2018 (SEC File No. 001-34018).
4.8	Indenture related to the 7.750% Senior Notes due 2027, dated as of May 23, 2019, among Gran Tierra Energy Inc., the guarantors named therein, and U.S. Bank National Association.	Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K filed with the SEC on May 23, 2019 (SEC File No. 001-34018).
4.9	First Supplemental Indenture related to 7.750% Senior Notes due 2027, dated as of July 23, 2019, among Gran Tierra Energy Inc., the guarantors named therein, and U.S. Bank.	Incorporated by reference to Exhibit 10.4 to the Quarterly Report on Form 10-Q, filed with the SEC on August 8, 2019 (SEC File No. 001-34018).
4.10	Form of 7.750% Senior Notes due 2027 (included as Exhibit A to Exhibit 4.1).	Incorporated by reference to Exhibit 4.2 to the Current Report on Form 8-K filed with the SEC on May 23, 2019 (SEC File No. 001-34018).
4.11	Description of securities.	Incorporated by reference to Exhibit 4.11 to the Annual Report on Form 10-K, filed with the SEC on February 27, 2020 (SEC File No. 001-34018).
10.1	Share Purchase Agreement dated as of June 30, 2016, among Gran Tierra Energy International Holdings Ltd., Tribeca Oil & Gas Inc., Macquarie Bank Limited, Rorick Ventures Group Inc., as vendors, and PetroLatina Energy Limited.	Incorporated by reference to Exhibit 2.1 to the Current Report on Form 8-K, filed with the SEC on July 7, 2016 (SEC File No. 001-34018).
10.2	Share and Loan Purchase Agreement, dated February 5, 2017, by Gran Tierra Energy International Holdings Ltd., Gran Tierra Luxembourg Holdings S. Á. R.L. and Maha Energy AB	Incorporated by reference to Exhibit 2.1 to the Current Report on Form 8-K filed with the SEC on July 6, 2017 (SEC File No. 001-34018).
10.3	Amendment #1, dated May 30, 2017, to the Share and Loan Purchase Agreement dated February 5, 2017 between Gran Tierra Energy International Holdings Ltd., Gran Tierra Luxembourg Holdings S.Á.R.L. and Maha	Incorporated by reference to Exhibit 2.2 to the Current Report on Form 8-K filed with the SEC on July 6, 2017 (SEC File No. 001-34018).
10.4	Amendment #2, dated June 22, 2017, to the Share and Loan Purchase Agreement dated February 5, 2017 between Gran Tierra Energy International Holdings Ltd., Gran Tierra Luxembourg Holdings S.Á.R.L. and Maha	Incorporated by reference to Exhibit 2.3 to the Current Report on Form 8-K filed with the SEC on July 6, 2017 (SEC File No. 001-34018)
10.5	Amendment #3, dated June 26, 2017, to the Share and Loan Purchase Agreement dated February 5, 2017 between Gran Tierra Energy International Holdings Ltd., Gran Tierra Luxembourg Holdings S.Á.R.L. and Maha	Incorporated by reference to Exhibit 2.4 to the Current Report on Form 8-K filed with the SEC on July 6, 2017 (SEC File No. 001-34018).
10.6	Amendment #4, dated August 31, 2017, to the Share and Loan Purchase Agreement dated February 5, 2017 between Gran Tierra Energy International Holdings Ltd., Gran Tierra Luxembourg Holdings S.Á.R.L. and Maha Energy AB.	Incorporated by reference to Exhibit 10.2 to the Quarterly Report on Form 10-Q filed with the SEC on November 2, 2017 (SEC File No. 001-34018).

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10.7	Amendment #5, dated October 26, 2017, to the Share and Loan Purchase Agreement dated February 5, 2017 between Gran Tierra Energy International Holdings Ltd., Gran Tierra Luxembourg Holdings S.Á.R.L. and Maha Energy AB.	Incorporated by reference to Exhibit 10.10 to the Annual Report on Form 10-K filed with the SEC on February 27, 2018 (SEC File No. 001-34018).
10.8	Amendment #6, dated November 8, 2017, to the Share and Loan Purchase Agreement dated February 5, 2017 between Gran Tierra Energy International Holdings Ltd., Gran Tierra Luxembourg Holdings S.Á.R.L. and Maha Energy AB.	Incorporated by reference to Exhibit 10.11 to the Annual Report on Form 10-K filed with the SEC on February 27, 2018 (SEC File No. 001-34018).
10.9	Amendment #7, dated November 17, 2017, to the Share and Loan Purchase Agreement dated February 5, 2017 between Gran Tierra Energy International Holdings Ltd., Gran Tierra Luxembourg Holdings S.Á.R.L. and Maha Energy AB.	Incorporated by reference to Exhibit 10.12 to the Annual Report on Form 10-K filed with the SEC on February 27, 2018 (SEC File No. 001-34018).
10.10	Amended and Restated 2007 Equity Incentive Plan.*	Incorporated by reference to Exhibit 10.6 to the Quarterly Report on Form 10-Q filed with the SEC on August 7, 2012 (SEC File No. 001-34018).
10.11	Form of Restricted Stock Unit Award Agreement Under the 2007 Equity Incentive Plan.*	Incorporated by reference to Exhibit 10.1 to the Quarterly Report on Form 10-Q filed with the SEC on August 7, 2013 (SEC File No. 001-34018).
10.12	Form of Option Agreement Under the 2007 Equity Incentive Plan.*	Incorporated by reference to Exhibit 10.2 to the Quarterly Report on Form 10-Q filed with the SEC on August 7, 2013 (SEC File No. 001-34018).
10.13	Form of Indemnity Agreement.*	Incorporated by reference to Exhibit 3.5 to the Current Report on Form 8-K filed with the SEC on November 4, 2016 (SEC File No. 001-34018).
10.14	Form of Deferred Stock Unit Award Agreement Under the 2007 Equity Incentive Plan.*	Incorporated by reference to Exhibit 10.29 to the Annual Report on Form 10-K, filed with the SEC on February 29, 2016 (SEC File No. 001-34018).
10.15	Form of Deferred Stock Unit Grant Notice.*	Incorporated by reference to Exhibit 10.30 to the Annual Report on Form 10-K, filed with the SEC on February 29, 2016 (SEC File No. 001-34018).
10.16	Executive Employment Agreement effective May 7, 2015, between Gran Tierra Energy Canada ULC, Gran Tierra Energy Inc. and Gary Guidry.*	Incorporated by reference to Exhibit 10.2 to the Quarterly Report on Form 10-Q, filed with the SEC on November 4, 2015 (SEC File No. 001-34018).
10.17	Executive Employment Agreement effective May 11 2015, between Gran Tierra Energy Canada ULC, Gran Tierra Energy Inc. and Lawrence West.*	Incorporated by reference to Exhibit 10.5 to the Quarterly Report on Form 10-Q, filed with the SEC on November 4, 2015 (SEC File No. 001-34018).
10.18	Executive Employment Agreement effective May 11, 2015, between Gran Tierra Energy Canada ULC, Gran Tierra Energy Inc. and James Evans.*	Incorporated by reference to Exhibit 10.6 to the Quarterly Report on Form 10-Q, filed with the SEC on November 4, 2015 (SEC File No. 001-34018).
10.19	Form of Performance Stock Unit Award Agreement Under the 2007 Equity Incentive Plan.*	Incorporated by reference to Exhibit 10.3 to the Quarterly Report on Form 10-Q, filed with the SEC on May 4, 2016 (SEC File No. 001-34018).
10.20	Form of Performance Stock Unit Grant Notice.*	Incorporated by reference to Exhibit 10.4 to the Quarterly Report on Form 10-Q, filed with the SEC on May 4, 2016 (SEC File No. 001-34018).
10.21	Executive Employment Agreement effective May 11 2015, between Gran Tierra Energy Canada ULC, Gran Tierra Energy Inc. and Ryan Ellson.*	Incorporated by reference to Exhibit 10.5 to the Quarterly Report on Form 10-Q, filed with the SEC on May 4, 2016 (SEC File No. 001-34018).

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10.22	Credit Agreement, dated as of September 18, 2015, by and among Gran Tierra Energy Inc., Gran Tierra Energy International Holdings Ltd., the Bank of Nova Scotia, Societe Generale and the lenders party thereto.	Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K, filed with the SEC on September 21, 2015 (SEC File No. 001-34018).
10.23	First Amendment to Credit Agreement, dated as of March 31, 2016, by and among Gran Tierra Energy International Holdings Ltd., Gran Tierra Energy Inc., The Bank of Nova Scotia, and the lenders party thereto.	Incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K, filed with the SEC on April 6, 2016 (SEC File No. 001-34018).
10.24	Second Amendment to Credit Agreement, dated as of June 2, 2016, by and among Gran Tierra Energy International Holdings Ltd., Gran Tierra Energy Inc., The Bank of Nova Scotia, and the lenders party thereto.	Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K, filed with the SEC on June 3, 2016 (SEC File No. 001-34018).
10.25	Third Amendment to Credit Agreement, dated as of August 23, 2016, by and among Gran Tierra Energy International Holdings Ltd., Gran Tierra Energy Inc., The Bank of Nova Scotia, and the lenders party thereto.	Incorporated by reference to Exhibit 10.42 to the Annual Report on Form 10-K, filed with the SEC on March 1, 2017 (SEC File No. 001-34018).
10.26	Fourth Amendment to Credit Agreement, dated as of November 16, 2016, by and among Gran Tierra Energy Inc., Gran Tierra Energy International Holdings Ltd., the Bank of Nova Scotia, Societe Generale and the lenders party thereto.	Incorporated by reference to Exhibit 10.43 to the Annual Report on Form 10-K, filed with the SEC on March 1, 2017 (SEC File No. 001-34018).
10.27	Fifth Amendment to Credit Agreement, dated as of February 13, 2017, by and among Gran Tierra Energy Inc., Gran Tierra Energy International Holdings Ltd., the Bank of Nova Scotia, Societe Generale and the lenders party thereto.	Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K, filed with the SEC on February 15, 2017 (SEC File No. 001-34018).
10.28	Sixth Amendment to Credit Agreement, dated May 17, 2017 and effective as of June 1, 2017, by and among Gran Tierra Energy Inc., Gran Tierra Energy International Holdings Ltd., the Bank of Nova Scotia, Societe Generale and the lenders party thereto.	Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K, filed with the SEC on May 19, 2017 (SEC File No. 001-34018).
10.29	Seventh Amendment to Credit Agreement, dated as of June 15, 2017, by and among Gran Tierra Energy Inc., Gran Tierra Energy International Holdings Ltd., the Bank of Nova Scotia, Societe Generale and the lenders party thereto.	Incorporated by reference to Exhibit 10.2 to the Quarterly Report on Form 10-Q, filed with the SEC on August 4, 2017 (SEC File No. 001-34018).
10.30	Eighth Amendment to Credit Agreement, dated as of September 18, 2017, by and among Gran Tierra Energy Inc., Gran Tierra Energy International Holdings Ltd., the Bank of Nova Scotia, Societe Generale and the lenders party thereto.	Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K, filed with the SEC on September 21, 2017 (SEC File No. 001-34018).
10.31	Ninth Amendment to Credit Agreement, dated as of November 10, 2017, by and among Gran Tierra Energy Inc., Gran Tierra Energy International Holdings Ltd., the Bank of Nova Scotia, Societe Generale and the lenders party thereto.	Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K, filed with the SEC on November 14, 2017 (SEC File No. 001-34018).
10.32	Tenth Amendment to Credit Agreement, dated as of May 25, 2018, by and among Gran Tierra Energy Inc., Gran Tierra Energy International Holdings Ltd., the Bank of Nova Scotia and the lenders party thereto.	Incorporated by reference to Exhibit 10.1 to the Quarterly Report on Form 10-Q, filed with the SEC on August 2, 2018 (SEC File No. 001-34018)

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10.33	Eleventh Amendment to Credit Agreement, dated as of December 20, 2018, by and among Gran Tierra Energy Inc., Gran Tierra Energy International Holdings Ltd., the Bank of Nova Scotia and the lenders party thereto.	Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K, filed with the SEC on December 21, 2018 (SEC File No. 001-34018)
10.34	Twelfth Amendment to Credit Agreement, dated as of May 14, 2019, by and among Gran Tierra Energy Inc., Gran Tierra Energy International Holdings Ltd., the Bank of Nova Scotia and the lenders party thereto.	Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K, filed with the SEC on May 15, 2019 (SEC File No. 001-34018)
10.35	Thirteenth Amendment to Credit Agreement, dated as of December 10, 2019, by and among Gran Tierra Energy Inc., Gran Tierra Energy International Holdings Ltd., the Bank of Nova Scotia and the lenders party thereto.	Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K, filed with the SEC on December 11, 2019 (SEC File No. 001-34018)
10.36	Fourteenth Amendment to Credit Agreement, dated as of June 1, 2020, by and among Gran Tierra Energy Inc., Gran Tierra Energy International Holdings Ltd., the Bank of Nova Scotia and the lenders party thereto.	Incorporated by reference to Exhibit 10.1 to the Quarterly Report on Form 10-Q, filed with the SEC on August 5, 2020 (SEC File No. 001-34018) (Certain schedules and exhibits to this agreement have been omitted pursuant to Item 601(a)(5) of Registration S-K. A copy of any omitted schedule and/or exhibit will be furnished supplementally to the SEC upon request).
10.37	Fifteenth Amendment to Credit Agreement, dated as of December 7, 2020, by and among Gran Tierra Energy Inc., Gran Tierra Energy International Holdings Ltd., the Bank of Nova Scotia and the lenders party thereto.	Filed herewith (Certain portions of this exhibit have been redacted pursuant to Item 601(b)(10)(iv) of Regulation S-K and certain schedules and exhibits to this agreement have been omitted pursuant to Item 601(a)(5) of Registration S-K. An unredacted copy of this exhibit and a copy of any omitted schedule and/or exhibit will be furnished supplementally to the SEC upon request).
10.38	Colombian Participation Agreement, dated as of June 22, 2006, by and among Argosy Energy International, Gran Tierra Energy Inc., and Crosby Capital, LLC.	Incorporated by reference to Exhibit 10.55 to the Quarterly Report on Form 10-Q, filed with the SEC on August 11, 2008 (SEC File No. 001-34018).
10.39	Amendment No. 1 to Colombian Participation Agreement, dated as of November 1, 2006, by and among Argosy Energy International, Gran Tierra Energy Inc., and Crosby Capital, LLC.	Incorporated by reference to Exhibit 10.56 to the Quarterly Report on Form 10-Q, filed with the SEC on August 11, 2008 (SEC File No. 001-34018).
10.40	Amendment No. 2 to Colombian Participation Agreement, dated as of July 3, 2008, between Gran Tierra Energy Inc. and Crosby Capital, LLC.	Incorporated by reference to Exhibit 10.3 to the Quarterly Report on Form 10-Q/A, filed with the SEC on November 19, 2008 (SEC File No. 001-34018).
10.41	Amendment No. 3 to Participation Agreement, dated as of December 31, 2008, by and among Gran Tierra Energy Colombia, Ltd., Gran Tierra Energy Inc. and Crosby Capital, LLC.	Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K, filed with the SEC on January 7, 2009 (SEC File No. 001-34018).
10.42	Amendment No. 4 dated June 13, 2011, to the Colombian Participation Agreement dated June 22, 2006, between Gran Tierra Colombia Ltd and Crosby Capital, LLC.	Incorporated by reference to Exhibit 10.1 to the Quarterly Report on Form 10-Q filed with the SEC on May 7, 2012 (SEC File No. 001-34018).
10.43	Amendment No. 5 dated February 10, 2011, to the Colombian Participation Agreement dated June 22, 2006, between Gran Tierra Colombia Ltd and Crosby Capital, LLC.	Incorporated by reference to Exhibit 10.2 to the Quarterly Report on Form 10-Q filed with the SEC on May 7, 2012 (SEC File No. 001-34018).
10.44	Amendment No. 6 dated March 1, 2012, to the Colombian Participation Agreement dated June 22, 2006, between Gran Tierra Colombia Ltd and Crosby Capital, LLC.	Incorporated by reference to Exhibit 10.9 to the Quarterly Report on Form 10-Q filed with the SEC on May 7, 2012 (SEC File No. 001-34018).

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10.45	Sale and Purchase Agreement for all of the issued share capital of Vetra Southeast S.L.U., dated February 20, 2019.	Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed with the SEC on February 25, 2019 (SEC File No. 001-34018).
10.46	Sale and Purchase Agreement for PUT-8, dated February 20, 2019.	Incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K filed with the SEC on February 25, 2019 (SEC File No. 001-34018).
10.47	Sale and Purchase Agreement for LLA-5, dated February 20, 2019.	Incorporated by reference to Exhibit 10.3 to the Current Report on Form 8-K filed with the SEC on February 25, 2019 (SEC File No. 001-34018).
10.48	Sale and Purchase Agreement for Suroriente, dated February 20, 2019.	Incorporated by reference to Exhibit 10.4 to the Current Report on Form 8-K filed with the SEC on February 25, 2019 (SEC File No. 001-34018).
10.49	Executive Employment Agreement, dated October 18, 2019, between Gran Tierra Energy Canada ULC and Gran Tierra Energy Inc. and Remi Anthony Berthelet.	Incorporated by reference to Exhibit 10.1 to the Quarterly Report on Form 10-Q filed with the SEC on November 6, 2019 (SEC File No. 001-34018).
21.1	List of subsidiaries.	Filed herewith.
23.1	Consent of KPMG LLP.	Filed herewith.
23.2	Consent of McDaniel & Associates Consultants Ltd.	Filed herewith.
24.1	Power of Attorney.	See signature page.
31.1	Certification of Principal Executive Officer Pursuant to Rule 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.	Filed herewith.
31.2	Certification of Principal Financial Officer Pursuant to Rule 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.	Filed herewith.
32.1	Certification of Principal Executive Officer and Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.	Furnished herewith.
99.1	Gran Tierra Energy Inc. Reserves Assessment and Evaluation of Oil and Gas Properties Corporate Summary, effective December 31, 2019.	Filed herewith.

101.INS Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document

101.SCH Inline XBRL Taxonomy Extension Schema Document

101.CAL Inline XBRL Taxonomy Extension Calculation Linkbase Document

101.DEF Inline XBRL Taxonomy Extension Definition Linkbase Document

101.LAB Inline XBRL Taxonomy Extension Label Linkbase Document

101.PRE Inline XBRL Taxonomy Extension Presentation Linkbase Document

104. Cover Page Interactive Data File - the cover page XBRL tags are embedded within the Inline XBRL document

* Management contract or compensatory plan or arrangement.

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Item 16. Form 10-K Summary

None.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

GRAN TIERRA ENERGY INC.

Date: February 24, 2021	/s/ Gary S. Guidry
	By: Gary S. Guidry
	President and Chief Executive Officer, Director
	(Principal Executive Officer)
Date: February 24, 2021	/s/ Ryan Ellson
	By: Ryan Ellson
	Chief Financial Officer and Executive Vice President, Finance
	(Principal Financial and Accounting Officer)

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POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Gary S. Guidry and Ryan Ellson, and each of them, as his true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities, to sign any and all amendments (including post-effective amendments) to this Annual Report on Form 10-K, and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, or their or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated:

Name	Title	Date
/s/ Gary S. Guidry	President and Chief Executive Officer, Director	February 24, 2021
Gary S. Guidry	(Principal Executive Officer)
/s/ Ryan Ellson	Chief Financial Officer and Executive Vice President, Finance	February 24, 2021
Ryan Ellson	(Principal Financial and Accounting Officer)
/s/ Peter Dey	Director	February 24, 2021
Peter Dey
/s/ Evan Hazell	Director	February 24, 2021
Evan Hazell
/s/ Robert B. Hodgins	Director	February 24, 2021
Robert B. Hodgins
/s/ Ronald Royal	Director	February 24, 2021
Ronald Royal
/s/ Sondra Scott	Director	February 24, 2021
Sondra Scott
/s/ David P. Smith	Director	February 24, 2021
David P. Smith
/s/ Brooke Wade	Director	February 24, 2021
Brooke Wade

97

EX-10.37

Exhibit 10.37

CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH NOT MATERIAL AND WOULD LIKELY CAUSE COMPETITIVE HARM TO THE REGISTRANT IF PUBLIC DISCLOSED. [***] INDICATES THAT INFORMATION HAS BEEN REDACTED.

Execution Version

FIFTEENTH AMENDMENT TO CREDIT AGREEMENT

This Fifteenth Amendment to Credit Agreement (this “Amendment”) is entered into effective as of the 7th day of December, 2020, by and among Gran Tierra Energy International Holdings Ltd., an exempted company incorporated with limited liability under the laws of the Cayman Islands (the “Borrower”), Gran Tierra Energy Inc., a corporation duly formed and existing under the laws of the State of Delaware (the “Parent”), The Bank of Nova Scotia, as administrative agent (the “Administrative Agent”) and the Lenders party hereto.

W I T N E S S E T H:

1.WHEREAS, the Borrower, the Parent, the Administrative Agent, and Lenders are parties to that certain Credit Agreement dated as of September 18, 2015 (as amended, supplemented or otherwise modified prior to the date hereof, the “Credit Agreement”) (unless otherwise defined herein, all terms used herein with their initial letter capitalized shall have the meaning given such terms in the Credit Agreement as amended by this Amendment);

2.WHEREAS, pursuant to the Credit Agreement, the Lenders have made certain Loans to the Borrower and provided certain other credit accommodations to the Borrower;

3.WHEREAS, the Lenders have agreed to a redetermination of the Borrowing Base, which redetermination shall constitute the Scheduled Redetermination to occur on or about November 1, 2020;

4.WHEREAS, the Borrower has requested that the Lenders approve the form of Permitted Advance Payment Agreement (the “Fifteenth Amendment Permitted Advance Payment Agreement”) and the Commercial Contracts (as defined in the Permitted Advance Payment Agreement, herein, the “Fifteenth Amendment Commercial Contracts”) in the forms attached as Exhibit A and the form of Subordination Agreement in the form attached as Exhibit B (the “Fifteenth Amendment Subordination Agreement”);

5.WHEREAS, the parties desire to enter into this Amendment to make certain amendments and modifications, in each case upon the terms and conditions set forth herein and in each case to be effective as of the Fifteenth Amendment Effective Date (as defined below);

6.WHEREAS, the Administrative Agent, the Borrower and the Lenders party hereto, which constitute at least the Required Revolving Credit Lenders, have agreed to enter into this

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US 7513942v.7

Amendment to amend the Credit Agreement and to set the Borrowing Base pursuant to the Scheduled Redetermination, as more particularly set forth herein;

7.NOW THEREFORE, for and in consideration of the mutual covenants and agreements herein contained and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged and confessed, the Credit Parties, the Administrative Agent and the Lenders hereto hereby agree as follows:

Section 1.Amendments. In reliance on the representations, warranties, covenants and agreements contained in this Amendment, and subject to the satisfaction of the conditions precedent set forth in Section 4 hereof, the Credit Agreement is, effective as of the Fifteenth Amendment Effective Date, hereby amended in the manner provided in this Section 1.

a.Amendment to Section 1.02. Section 1.02 of the Credit Agreement is hereby amended to insert the following definitions therein in appropriate alphabetical order which shall read in full as follows:

“Accounts Payable” means all accounts payable and all accrued expenses and liabilities to third parties or other obligations of such Person to pay the deferred purchase price of Property or services.

“Commercial Contract” has the meaning set forth in the definition of Permitted Advance Payment Agreement.

“Fifteenth Amendment” means that certain Fifteenth Amendment, dated as of December 7th, 2020, by and among the Parent, the Borrower, the Administrative Agent and the other parties thereto.

“Fifteenth Amendment Permitted Advance Payment Agreement” has the meaning set forth in the Fifteenth Amendment.

“Fifteenth Amendment Subordination Agreement” has the meaning set forth in the Fifteenth Amendment.

“Initial Permitted Advance Payment Amount” has the meaning set forth in Section 8.01(y).

“Outstanding Permitted Advance Payment Amount” has the meaning set forth in Section 8.01(y).

“Required Availability Amount” means an amount, as of the relevant date of determination, equal to (a) (i) from December 31, 2020 through and including, June 29, 2021, $15,000,000 and (ii) from June 30, 2021 and thereafter, $20,000,000, plus (b) one-half (1/2) of the Outstanding Permitted Advance Payment Amount, plus (c) to the extent not included in the Outstanding Permitted Advance Payment Amount in the foregoing clause (b), one half (1/2) of any Initial Permitted Advance Payment Amount.

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“Shortfall Payment” means a cash payment required to be made on a monthly basis in lieu of delivery of crude oil and solely due to under delivery of crude oil pursuant to the terms of any applicable Permitted Advance Payment Agreement; which repayment under any Permitted Advance Payment Agreement shall be substantially in accordance with the requirements of clause 4.5.3(ii) of the Fifteenth Amendment Advance Payment Agreement.

b.Amendment to Section 1.02. Section 1.02 of the Credit Agreement is hereby amended to amend and restate the definition of “Permitted Advance Payment Agreement” therein which shall read in full as follows:

“Permitted Advance Payment Agreement” means any agreement between any Credit Party and any Person pursuant to which such Credit Party agrees to sell production from Oil and Gas Properties pursuant to one or more Commercial Contracts (as defined in such Permitted Advance Payment Agreement) to such Person in exchange for one or more advance payments from such Person, in form and substance (a) substantially consistent, and otherwise in form reasonably satisfactory to the Administrative Agent, with the Fifteenth Amendment Permitted Advance Payment Agreement; provided that the following additions and changes to the Fifteenth Amendment Permitted Advance Payment Agreement shall be deemed not to be substantially consistent with the Fifteenth Amendment Permitted Advance Payment Agreement: any existence of minimum volume commitments, more punitive advance life coverage ratio, additional or inconsistent termination or prepayment provisions (of any kind, including as they relate to the Commercial Contracts), collateral or guarantee requirements, the removal of the requirement that such contract be subordinated on the same terms to the claims of the Lenders or any other economic change which is adverse to any Credit Party or the interests of the Lenders; or (b) reasonably satisfactory to the Required Revolving Credit Lenders.

c.Amendment to Section 1.02. Section 1.02 of the Credit Agreement is hereby amended to amend and restate the definition of “Senior Secured Leverage Ratio” therein which shall read in full as follows:

“Senior Secured Leverage Ratio” means, as of any date of determination, the ratio of (a)(i) Senior Secured Obligations plus (ii) solely to the extent not constituting Senior Secured Obligations, Accounts Payable which are more than ninety (90) days past the date of invoice, in each case, as of such date to (b) EBITDAX for the four fiscal quarters ending on such date.

d.Amendment to Section 1.02. Section 1.02 of the Credit Agreement is hereby amended to amend and restate the definition of “Subordination Agreement” therein which shall read in full as follows:

“Subordination Agreement” means any subordination agreement subordinating the Credit Parties’ obligations under any Permitted Advance Payment Agreement to the Credit Parties’ Secured Obligations, in form and substance (a) substantially consistent, and otherwise in form reasonably satisfactory to the Administrative Agent, with the

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Fifteenth Amendment Subordination Agreement; provided that any removal of any requirement that the counterparty thereto is not subordinate on the same terms of payment, any removal of any pledge or security interest granted by such counterparty or any other change to the priority of security or payment subordination set forth therein shall be deemed not to be substantially consistent with such subordination agreement; or (b) reasonably satisfactory to the Required Revolving Credit Lenders.

e.Amendment to Section 1.02. Section 1.02 of the Credit Agreement is hereby amended to insert “(c), “ immediately after each instance of “(a), (b), ” in the definition of “Total Debt” therein.

f.Amendment to Section 6.02. Section 6.02 of the Credit Agreement is hereby amended to:

(i)Amend and restate the final paragraph thereof as follows:

Each request for a Borrowing of Loans under Section 2.02 and each request for the issuance, amendment, renewal or extension of any Letter of Credit shall be deemed to constitute a representation and warranty by the Credit Parties on the date thereof as to the matters specified in Section 6.02(a), (b), (d) and (e).

(ii)insert a new clause (e) immediately after clause (d) therein which shall read in full as follows:

(e) During the Covenant Relief Period, at the time of and on a pro forma basis, immediately after giving effect to such Borrowing or the issuance, amendment, renewal or extension of such Letter of Credit, as applicable, the aggregate Revolving Credit Exposure of all Revolving Credit Lenders shall not exceed an amount equal to (i) the aggregate Revolving Credit Commitments of all Revolving Credit Lenders minus (ii) the Required Availability Amount (or such lesser amount as consented to by the Required Revolving Credit Lenders).

g.Amendment to Section 8.01. Section 8.01 of the Credit Agreement is hereby amended to insert the following new clauses (x) and (y) in appropriate alphabetical order thereto which shall read in full as follows:

(x)    Accounts Payable Aging.    No later than fourteen (14) days after the end of each calendar month, a report in form reasonably acceptable to the Administrative Agent, detailing (i) the aggregate amounts and days outstanding for all Accounts Payable as of the end of such prior calendar month, segregated into categories of (A) less than or equal to thirty (30), (B) less than or equal to sixty (60), (C) less than or equal to ninety (90) and (D) greater than ninety (90), in each case, days outstanding from both the date of invoice and the due date thereof and (ii) with respect to any Accounts Payable which are outstanding more than ninety (90) days from the date of invoice or the due date thereof, to whom such Accounts Payable are owed and any supporting information reasonably requested by the Administrative Agent.

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(y)    Permitted Advance Payment Agreement Reporting. (i) No later than fourteen (14) days after the end of each calendar month, a certificate of a Responsible Officer of the Borrower (A) setting forth all amounts outstanding under each Permitted Advance Payment Agreement as of the end of such prior calendar month (such aggregate amount outstanding under all Permitted Advance Payment Agreements, the “Outstanding Permitted Advance Payment Amount”), (B) setting forth the aggregate amount paid and volume of oil delivered (if any) by any Credit Party under each Permitted Advance Payment Agreement during such prior calendar month, and (C) certifying that the information set forth in such certificate is true and correct and (ii) no later than three (3) days after the execution of any Permitted Advance Payment Agreement, a certificate of a Responsible Officer of the Borrower (A) setting forth the initial amount outstanding under such Permitted Advance Payment Agreement (such amount, an “Initial Permitted Advance Payment Amount”) and (B) certifying that the information set forth in such certificate is true and correct.

h.Amendment to Section 8.02(d). Section 8.02(d) of the Credit Agreement is hereby amended and restated in its entirety to read in full as follows:

(d)    the occurrence of any event which requires any payment of the Credit Parties’ obligations (including prior to the original due date thereof) or results in the termination of any Permitted Advance Payment Agreement prior to the initial stated maturity date thereof.

i.Amendment to Section 8.16. Section 8.16 of the Credit Agreement is hereby amended and restated in its entirety to read in full as follows:

Section 8.16    Minimum Hedging Requirement. Minimum Hedging Requirement. Within ten (10) Business Days after the first funding under any Permitted Advance Payment Agreement, the Credit Parties shall enter into and maintain Swap Agreements (with price floors reasonably satisfactory to the Administrative Agent), where net notional volumes (when aggregated with other commodity Swap Agreements then in effect) are not less than one hundred percent (100%) of the total amount of production required to be sold under all Permitted Advance Payment Agreements on a monthly basis sufficient to cover the monthly amortization payments under all then existing Permitted Advance Payment Agreements until the final scheduled payment thereunder.

j.Amendment to Section 9.01(c). Section 9.01(c) of the Credit Agreement is hereby amended and restated in its entirety to read in full as follows:

(c)    Interest Coverage Ratio. The Parent will not (i) as of last day of the fiscal quarters ending (x) June 30, 2020 and (y) September 30, 2020, in each case, permit its ratio of EBITDAX for the period of four fiscal quarters then ending to Interest Expense for such period to be less than 2.5 to 1.0, (ii) as of the last day of the fiscal quarters ending December 31, 2020 and March 31, 2021, permit its ratio of EBITDAX for the period of four fiscal quarters then ending to Interest Expense for such period to be less than 1.5 to 1.0, (iii) as of the last day of the fiscal quarters ending June 30, 2021 and

5

September 30, 2021, permit its ratio of EBITDAX for the period of four fiscal quarters then ending to Interest Expense for such period to be less than 2.0 to 1.0, and (iv) as of the last day of any fiscal quarter thereafter, commencing on the fiscal quarter ending

December 31, 2021, permit its ratio of EBITDAX for the period of four fiscal quarters then ending to Interest Expense for such period to be less than 2.5 to 1.0.

k.Amendment to Section 9.02(l). Section 9.02(l) of the Credit Agreement is hereby amended and restated in its entirety to read in full as follows:

(l)    Unsecured Debt constituting obligations under Permitted Advance Payments Agreements in an aggregate amount for all such Permitted Advance Payment Agreements not to exceed $25,000,000.00 (or such greater amount as consented to by the Required Revolving Credit Lenders); provided that (a) a Subordination Agreement (including the Fifteenth Amendment Subordination Agreement) shall be executed concurrently with any such Permitted Advance Payment Agreement (including the Fifteenth Amendment Permitted Advance Payment Agreement), and such Permitted Advance Payment Agreement (including the Fifteenth Amendment Permitted Advance Payment Agreement) shall remain subject to such Subordination Agreement (including the Fifteenth Amendment Subordination Agreement), (b) on or before the date of execution of any such Permitted Advance Payment Agreement (including the Fifteenth Amendment Permitted Advance Payment Agreement), the Administrative Agent shall have received an opinion of special Colombian counsel regarding such Subordination Agreement (including the Fifteenth Amendment Subordination Agreement), including that such Subordination Agreement (including the Fifteenth Amendment Subordination Agreement) is enforceable against the creditor of such Debt (such creditor being the Person purchasing Oil and Gas under the applicable Permitted Advance Payment Agreement), and covering such other matters and otherwise in form and substance satisfactory to the Administrative Agent and (c) no amounts shall be outstanding under any Permitted Advance Payment Agreement and no Credit Party shall make a utilization under a Permitted Advance Payment Agreement if it results in scheduled amortization (whether by way of cash or the delivery of Oil and Gas under a Commercial Contract or otherwise), in each case, at any time after January 29, 2022, without the prior written consent of the Required Revolving Credit Lenders.

l.Amendment to Sections 9.04(b)(ii)(A) and (B). Sections 9.04(b)(ii)(A) and (B) of the Credit Agreement are each hereby amended to insert the following proviso immediately after the first reference of “seventy five percent (75%)” in each such provision:

; provided that the Credit Parties may make up to four (4) Shortfall Payments in total, with no more than two (2) Shortfall Payments being paid on or before June 30, 2021 and no more than two (2) Shortfall Payments being paid on or after July 1, 2021 and on or before December 31, 2021, in each case, if it is otherwise unable to meet the criteria set forth in this clause (1)

m.Amendment to Section 9.04(c). Section 9.04(c) of the Credit Agreement is amended to (a) delete “or” immediately before “(C)” therein and insert “, ” in lieu thereof and (b) insert “or (D) any amendment, modification or waiver which is not deemed to be substantially consistent with the

6

Fifteenth Amendment Permitted Advance Payment Agreement as set forth in the definition of “Permitted Advance Payment Agreement” shall be deemed adverse to the Lenders” immediately before the “.” at the end of such subsection.

n.Amendment to Article IX. Article IX of the Credit Agreement is hereby amended to insert a new Section 9.21 in appropriate numerical order thereto which shall read in full as follows:

Section 9.21.    Required Availability Amount.    At all times until the Covenant Relief Period Expiration Date, the Credit Parties shall not permit the aggregate Revolving Credit Exposure for all Revolving Credit Lenders to exceed an amount equal to (a) the aggregate Revolving Credit Commitments of all Revolving Credit Lenders minus (b) the Required Availability Amount; provided that (a) if the Required Availability Amount increases by an Initial Advance Payment Amount as a result of the execution of a Permitted Advance Payment Agreement, such increase shall become effective five (5) Business Days after execution of such Permitted Advance Payment Agreement solely for purposes of this Section 9.21 and (b) neither this Section 9.21 not the definition of “Required Revolving Availability Amount” may be amended without the consent of the Administrative Agent and the Required Revolving Credit Lenders.

o.Amendment to Section 10.01(q). Section 10.01(q) of the Credit Agreement is hereby amended and restated in its entirety to read in full as follows:

(q)    any event or circumstance occurs which requires any Credit Party to make any payment under any Permitted Advance Payment Agreement prior to the original due date thereof, whether by acceleration or otherwise (but excluding, for clarity, any Shortfall Payments permitted to be made pursuant to Section 9.04(b)(ii)) or which results in the termination of any Permitted Advance Payment Agreement prior to the initial stated termination date thereof.

p.Amendment to Section 10.01. Section 10.01 of the Credit Agreement is hereby amended to insert a new clause (r) in appropriate alphabetical order thereto which shall read in full as follows:

(r)    the failure of any Person to whom a Permitted Advance Payment Agreement is assigned to comply with the requirement that, at the time of such assignment, such Person enter into an acknowledgment and acceptance letter recognizing the existence of, or an agreement agreeing to be bound by, the applicable Subordination Agreement in form and substance reasonably satisfactory to the Administrative Agent.

q.Amendment to Article XI. Article XI of the Credit Agreement is hereby amended to insert a new Section 11.15 in appropriate numerical order thereto, which shall read in full as follows:

Section 11.15    Subordination Agreement.

(a)    Each of the Lenders, the Issuing Bank and the other Secured Parties hereby irrevocably authorizes and directs the Administrative Agent to execute and deliver, in each case on behalf of such Secured Party and without any further consent,

7

authorization or other action by such Secured Party, (i) from time to time upon the request of the Borrower, in connection with the execution of any Permitted Advance Payment Agreement, any Subordination Agreement and (ii) any documents relating thereto.

(b)    Each of the Lenders, the Issuing Bank and the other Secured Parties hereby irrevocably (i) consents to the treatment of Liens to be provided for under the Subordination Agreement, (ii) agrees that, upon the execution and delivery thereof, such Secured Party will be bound by the provisions of any Subordination Agreement as if it were a signatory thereto and will take no actions contrary to the provisions of any Subordination Agreement, (iii) agrees that no Secured Party shall have any right of action whatsoever against the Administrative Agent as a result of any action taken by the Administrative Agent pursuant to this Section or in accordance with the terms of any Subordination Agreement and (iv) authorizes and directs the Administrative Agent to carry out the provisions and intent of any Subordination Agreement.

(c)    The Administrative Agent shall have the benefit of the provisions of Article XII with respect to all actions taken by it pursuant to this Section 11.15 or in accordance with the terms of any Intercreditor Agreement to the full extent thereof.

Section 2.Redetermination of Borrowing Base. Subject to the satisfaction of the conditions precedent set forth in Section 4 hereof, the Lenders hereby agree that for the period from and including the Fifteenth Amendment Effective Date, but until the next Scheduled Redetermination Date, the next Interim Redetermination Date or the next adjustment to the Borrowing Base, including under Section 2.08(e), Section 2.08(f) or Section 2.08(g) of the Credit Agreement, whichever occurs first, the amount of the Borrowing Base shall be reduced from $225,000,000 to $215,000,000, which redetermination of the Borrowing Base shall constitute the November 1, 2020 Scheduled Redetermination of the Borrowing Base. This Section 2 constitutes the New Borrowing Base Notice for the November 1, 2020 Scheduled Redetermination of the Borrowing Base.

Section 3.Consent to Execution. The Administrative Agent and each Lender, by executing this Amendment, hereby consent to the execution and delivery of the Fifteenth Amendment Permitted Advance Payment Agreement, the Fifteenth Amendment Commercial Contracts and the Fifteenth Amendment Subordination Agreement, in each case, with [***], on the terms and conditions, and subject to the limitations, in each case set forth herein and in the Credit Agreement (as amended by this Amendment). The consent set forth in this Section 3 is a one-time consent only to the execution and delivery of the Fifteenth Amendment Permitted Advance Payment Agreement, the Fifteenth Amendment Commercial Contracts and the Fifteenth Amendment Subordination Agreement, in each case explicitly subject to the terms, conditions and limitations in the Credit Agreement (as amended by this Amendment) and shall not be deemed or construed to be, and the Credit Parties agree that it is not, a waiver of any or all of such terms, conditions and limitations. The consent set forth in this Section 3 shall not obligate the Administrative Agent or the Lenders to waive any such term, condition or

8

limitation or consent to the breach of any such term, condition or limitation in the future and does not constitute a course of dealing among the parties.

Section 4.Conditions Precedent. This Amendment shall be effective on the date that each of the following conditions precedent is satisfied or waived by the Required Revolving Credit Lenders (the “Fifteenth Amendment Effective Date”):

a.Counterparts. Administrative Agent shall have received from the Lenders constituting at least the Required Revolving Credit Lenders, the Parent, the Borrower and Guarantors counterparts (in such number as may be requested by the Administrative Agent) of this Amendment signed on behalf of such Persons.

b.Approval of the Fifteenth Amendment Permitted Advance Payment Agreement, the Fifteenth Amendment Commercial Contracts and the Fifteenth Amendment Subordination Agreement. The Administrative Agent shall have received confirmation that the Lenders constituting at least the Required Revolving Credit Lenders shall have consented to the forms of the Fifteenth Amendment Permitted Advance Payment Agreement, the Fifteenth Amendment Commercial Contracts and the Fifteenth Amendment Subordination Agreement, in each case, with [***].

c.Fees and Expenses. The Borrower shall have paid to the Administrative Agent all other fees and expenses required to be paid by the Borrower under Section 12.03 of the Credit Agreement (other than fees of counsel to the Administrative Agent), including those payable pursuant to that certain fee letter by and between the Borrower and the Administrative Agent, dated as of the date hereof.

Section 5.Representations and Warranties of the Borrower. To induce the Lenders and Administrative Agent to enter into this Amendment, each Credit Party hereby represents and warrants to Lenders and Administrative Agent as follows:

a.Reaffirmation of Loan Documents; Extension of Liens. Any and all of the terms and provisions of the Credit Agreement and the other Loan Documents shall, except as amended hereby, remain in full force and effect. The Credit Parties hereby extend the Liens securing the Secured Obligations until the Secured Obligations have been paid in full, and agree that the amendments and waivers herein contained shall in no manner affect or impair the Secured Obligations or the Liens securing payment and performance thereof, all of which are ratified and confirmed.

b.Reaffirm Existing Representations and Warranties. Each representation and warranty of such Credit Party contained in the Credit Agreement and the other Loan Documents is true and correct in all material respects (except to the extent any such representation or warranty is qualified by materiality or Material Adverse Effect, in which case it shall be true and correct in all respects) on the date hereof after giving effect to the amendments set forth herein, except to the extent any such representations and warranties are expressly limited to an earlier date, in which case, such representations and warranties shall continue to be true and correct in all material respects (except to the extent any such representation or warranty is qualified by materiality or Material Adverse Effect, in which case it shall be true and correct in all respects) as of such specified earlier date.

9

c.Due Authorization; No Conflict. The execution, delivery and performance by such Credit Party of this Amendment are within such Credit Party’s organizational powers and have been duly authorized by all necessary corporate and, if required, stockholder or shareholder action (including, without limitation, any action required to be taken by any class of directors of such Credit Party or any other Person, whether interested or disinterested, in order to ensure the due authorization of this Amendment). The execution, delivery and performance by such Credit Party of this Amendment (a) do not require any consent or approval of, registration or filing with, or any other action by, any Governmental Authority or any other third Person (including shareholders or any class of directors, whether interested or disinterested, of the Parent, such Credit Party or any other Person), nor is any such consent, approval, registration, filing or other action necessary for the validity or enforceability of this Amendment, except such as have been obtained or made and are in full force and effect other than those third party approvals or consents which, if not made or obtained, would not cause a Default hereunder, could not reasonably be expected to have a Material Adverse Effect or do not have an adverse effect on the enforceability of this Amendment, (b) will not violate any applicable law or regulation or the charter, by-laws or other organizational documents of such Credit Party or any order of any Governmental Authority, (c) will not violate or result in a default under any Material Document or any indenture, agreement or other instrument binding upon such Credit Party or its Properties, or give rise to a right thereunder to require any payment to be made such Credit Party, and (d) will not result in the creation or imposition of any Lien on any Property of any Credit Party (other than the Liens created by the Loan Documents).

d.Validity and Enforceability. This Amendment constitutes a legal, valid and binding obligation of such Credit Party, enforceable in accordance with its terms, subject to applicable bankruptcy, insolvency, reorganization, moratorium or other laws affecting creditors’ rights generally and subject to general principles of equity, regardless of whether considered in a proceeding in equity or at law.

e.Acknowledgment of No Defenses. Such Credit Party acknowledges that it has no defense to such Credit Party’s obligation to pay the Obligations when due, or the validity, enforceability or binding effect against such Credit Party of the Credit Agreement or any of the other Loan Documents (to the extent a party thereto) or any Liens intended to be created thereby.

Section 6.Miscellaneous.

a.Reaffirmation of Loan Documents. Any and all of the terms and provisions of the Credit Agreement and the Loan Documents shall, except as amended and modified hereby, remain in full force and effect. This Amendment shall not limit or impair any Liens securing the Secured Obligations, each of which are hereby ratified, affirmed and extended to secure the Secured Obligations as it may be increased pursuant hereto. This Amendment constitutes a Loan Document.

b.Parties in Interest. All of the terms and provisions of this Amendment shall bind and inure to the benefit of the parties hereto and their respective successors and assigns.

c.Counterparts. This Amendment may be executed in counterparts, including, without limitation, by an electronic sound, symbol, or process attached to, or associated with, a contract or other record and adopted by a person with the intent to sign, authenticate or accept such contract or record (an “Electronic Signature”), and all parties need not execute the same counterpart; however, no

10

party shall be bound by this Amendment until each Credit Party, the Administrative Agent and the Lenders have executed a counterpart. Facsimiles or other electronic transmissions (e.g. pdfs) of such executed counterparts shall be effective as originals. The words “execution,” “signed,” “signature,” “delivery,” and words of like import in or relating to any document to be signed in connection with this Fifteenth Amendment and the transactions contemplated hereby shall be deemed to include Electronic Signatures, deliveries or the keeping of records in electronic form, each of which shall be of the same legal effect, validity or enforceability as a manually executed signature, physical delivery thereof or the use of a paper-based recordkeeping system, as the case may be, to the extent and as provided for in any applicable law, including the Federal Electronic Signatures in Global and National Commerce Act, the New York State Electronic Signatures and Records Act, or any other similar state laws based on the Uniform Electronic Transactions Act.

d.Complete Agreement. THIS AMENDMENT, THE CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN OR AMONG THE PARTIES.

e.Headings. The headings, captions and arrangements used in this Amendment are, unless specified otherwise, for convenience only and shall not be deemed to limit, amplify or modify the terms of this Amendment, nor affect the meaning thereof.

f.Governing Law. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their respective authorized officers on the date and year first above written.

[Signature pages to follow]

11

BORROWER:        gran tierra energy international

        holdings ltd.

By:     /s/ Manuel Buitrago        

Name: Manuel Buitrago

Title:     President

PARENT:        GRAN TIERRA ENERGY INC.

By:      /s/ Ryan Ellson                

Name: Ryan Ellson

Title:  Executive Vice President and Chief Financial

    Officer

1

ADMINISTRATIVE AGENT:     THE BANK OF NOVA SCOTIA,

By:       /s/ Ana Espinoza                                     

Name:  Ana Espinoza

Title:    Director, International Banking

By:      /s/ Daniel Gracian                                   

Name:   Daniel Gracian

Title:     Director, International Banking

Signature Page – Fifteenth Amendment (Gran Tierra Energy International Holdings Ltd.)

LENDERS:     THE BANK OF NOVA SCOTIA, as a Lender

By:       /s/ Ana Espinoza                            

Name:  Ana Espinoza

Title:    Director, International Banking

By:       /s/ Ana Espinoza                            

Name:   Daniel Gracian

Title:     Director, International Banking

Signature Page – Fifteenth Amendment (Gran Tierra Energy International Holdings Ltd.)

    SOCIÉTÉ GÉNÉRALE,

as a Lender

By:      /s/ Roberto Simon                        

Name: Roberto Simon

Title:    Managing Director

Signature Page – Fifteenth Amendment (Gran Tierra Energy International Holdings Ltd.)

    HSBC BANK CANADA,

as a Lender

By:      /s/ Sherry Gauthier                              

Name: Sherry Gauthier

Title:    Assistant Vice President, Sales &     Operations,

             Commercial Banking, Prairies Region

By:      /s/ Bruce Robinson           _                  

Name: Bruce Robinson

Title:   VP, Energy Financing

Signature Page – Fifteenth Amendment (Gran Tierra Energy International Holdings Ltd.)

    EXPORT DEVELOPMENT CANADA,

as a Lender

By:      /s/ Sylvain Emond    

Name: Sylvain Emond

Title: Project Finance Manager

By:      /s/ Ashley Glen    

Name: Ashley Glen

Title: Project Finance Manager

Signature Page – Fifteenth Amendment (Gran Tierra Energy International Holdings Ltd.)

    ROYAL BANK OF CANADA,

as a Lender

By:      /s/ Maria Hushovd    

Name: Maria Hushovd

Title: Authorized Signatory

Signature Page – Fifteenth Amendment (Gran Tierra Energy International Holdings Ltd.)

    CANADIAN IMPERIAL BANK OF COMMERCE,

as a Lender

By:      /s/ Ryan Shea    

Name: Ryan Shea

Title:   Director

By:      /s/ Graydon Falls    

Name: Graydon Falls

Title:   Executive Director

Signature Page – Fifteenth Amendment (Gran Tierra Energy International Holdings Ltd.)

Signature Page – Fifteenth Amendment (Gran Tierra Energy International Holdings Ltd.)

Each of the undersigned Guarantors (i) consents and agrees to this Amendment, and (ii) agrees that the Loan Documents and Security Instruments to which it is a party (including, without limitation, the Guaranty Agreement, dated as of September 18, 2015, each as amended, modified or supplemented) shall remain in full force and effect and shall continue to be the legal, valid and binding obligation of the undersigned, enforceable against it in accordance with its terms.

CONSENTED, ACKNOWLEDGED AND AGREED TO BY:

GRAN TIERRA ENERGY INC.

By:      /s/ Ryan Ellson                

Name: Ryan Ellson

Title:  Executive Vice President and Chief

    Financial Officer

GRAN TIERRA ENERGY COLOMBIA, LLC

By:     /s/ Manuel Buitrago                         

Name: Manuel Buitrago

Title:     President

GRAN TIERRA RESOURCES LIMITED

By:      /s/ Ryan Ellson                

Name: Ryan Ellson

Title:  Chief Financial Officer

GRAN TIERRA ENERGY CAYMAN ISLANDS INC.

By:     /s/ Manuel Buitrago                         

Name: Manuel Buitrago

Title:     President

Signature Page to Guarantor Reaffirmation – Fifteenth Amendment (Gran Tierra Energy International Holdings Ltd.)

PETROLIFERA PETROLEUM (COLOMBIA) LIMITED

By:     /s/ Manuel Buitrago                         

Name: Manuel Buitrago

Title:     President

GRAN TIERRA COLOMBIA INC.

By:     /s/ Manuel Buitrago                         

Name: Manuel Buitrago

Title:     President

GRAN TIERRA ENERGY RESOURCES INC.

By:     /s/ Manuel Buitrago                         

Name: Manuel Buitrago

Title:     President

Signature Page to Guarantor Reaffirmation – Fifteenth Amendment (Gran Tierra Energy International Holdings Ltd.)

Exhibit A

Form of Permitted Advance Payment Agreement

[Attached.]

Exhibit A

Exhibit B

Form of Subordination Agreement

[Attached.]

Exhibit B

EX-21.1

Exhibit 21.1

SUBSIDIARIES OF GRAN TIERRA ENERGY INC.

The table below sets forth all subsidiaries of Gran Tierra Energy Inc. and the state or other jurisdiction of incorporation or organization of each as of February 19, 2021.

Subsidiary	Jurisdiction of Incorporation
Gran Tierra Resources Limited	Alberta, Canada
Gran Tierra Energy Mexico Holdings 1 LLC	Delaware
Gran Tierra Energy Mexico Holdings 2 LLC	Delaware
Gran Tierra México Energy. S.A. de C.V.	Mexico
Gran Tierra Energy International Holdings Ltd	Cayman Islands
Gran Tierra Energy N.V. ULC	Alberta, Canada
Petrolifera Petroleum (Colombia) Limited	Cayman Islands
Gran Tierra Energy Cayman Islands Inc.	Cayman Islands
Gran Tierra Energy Colombia, LLC	Cayman Islands
Gran Tierra Colombia Inc.	Cayman Islands
Gran Tierra Energy Resources Inc.	Cayman Islands
Suroco Energy Venezuela	Venezuela
Southeast Investment Corporation	Cayman Islands

EX-23.1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statement Nos. 333-146815, 333-156994, 333-171122 and 333-183029, on Form S-8, and Registration Statement No. 333-227204 on Form S-3 of Gran Tierra Energy Inc. of our reports dated February 24, 2021, with respect to the consolidated balance sheets of Gran Tierra Energy Inc. as of December 31, 2020 and 2019, the related consolidated statements of operations, shareholders’ equity, and cash flows for the years then ended, and the related notes, and the effectiveness of internal control over financial reporting as of December 31, 2020, which reports appears in the December 31, 2020 annual report on Form 10‑K of Gran Tierra Energy Inc..

/s/ KPMG LLP

Chartered Professional Accountants

Calgary, Canada

February 24, 2021

EX-23.2

Exhibit 23.2

Consent of Independent Reserve Engineers

Mr. Ryan Ellson

Chief Financial Officer

Gran Tierra Energy Inc. ("Gran Tierra")

900, 520 3 Avenue S.W.

Calgary, Alberta, Canada T2P 0R3

Re:	Gran Tierra Registration Statement:
	Form S-8 (Reg. Nos. 333-146815, 333-156994, 333-171122 and 333-183029)
	Form S-3 (Reg. No. 333-227204)
	Filed with the United States Securities Exchange Commission

Dear Mr. Ellson:

As the independent reserve engineers for Gran Tierra, McDaniel & Associates Consultants Ltd. ("McDaniel"), hereby confirms that it has granted and not withdrawn its consent to the filing of McDaniel reserve report and to the reference to McDaniel's evaluation of Gran Tierra's reserves as of December 31, 2020, in the form and context disclosed by Gran Tierra in its Annual Report on Form 10-K submission filed with the United States Securities and Exchange Commission on approximately February 24, 2021, for the period ended December 31, 2020, and to the incorporation by reference thereof in the registration statements listed above.

Please do not hesitate to contact us if you have any questions.

McDaniel & Associates Consultants Ltd.

/s/ Cam Boulton

Cam Boulton

Executive Vice President

Dated: February 24, 2021

Calgary, Alberta

CANADA

EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO RULE 13A-14(A) AND RULE 15D-14(A)

OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

I, Gary S. Guidry, certify that:

1. I have reviewed this Form 10-K of Gran Tierra Energy Inc.;

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 officer 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 most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) 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 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.

Date: February 24, 2021	/s/ Gary S. Guidry
	By: Gary S. Guidry
	President and Chief Executive Officer, Director
	(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO RULE 13A-14(A) AND RULE 15D-14(A)

OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

I, Ryan Ellson, certify that:

1. I have reviewed this Form 10-K of Gran Tierra Energy Inc.;

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 officer 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 most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) 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 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.

Date: February 24, 2021	/s/ Ryan Ellson
	By: Ryan Ellson
	Chief Financial Officer and Executive Vice President, Finance
	(Principal Financial Officer)

EX-32.1

Exhibit 32.1

Certification of Chief Executive Officer and Chief Financial Officer

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

(Section 1350, Chapter 63 of Title 18, United States Code)

Pursuant to the requirement set forth in Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) and Section 1350, Chapter 63 of Title 18 of the United States Code (18 U.S.C-§1350), each of Gary Guidry, President and Chief Executive Officer of Gran Tierra Energy Inc., a Delaware corporation (the “Company”), and Ryan Ellson, Chief Financial Officer of the Company, does hereby certify, to such officer’s knowledge that:

The Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (the “Form 10-K”) to which this Certification is attached as Exhibit 32.1 fully complies with the requirements of Section 13(a) or 15(d) of the Exchange Act. The information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of the Company.

IN WITNESS WHEREOF, the undersigned have set their hands hereto as of the 24th day of February 2021.

/s/ Gary S. Guidry

By: Gary S. Guidry

President and Chief Executive Officer, Director

/s/ Ryan Ellson

By: Ryan Ellson

Chief Financial Officer and Executive Vice President, Finance

The foregoing certification is being furnished solely pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (Section 1350, Chapter 63 of Title 18, United States Code) and is not deemed filed with the Securities and Exchange Commission as part of the Form 10-K or as a separate disclosure document and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act (whether made before or after the date of the Form 10-K), irrespective of any general incorporation language contained in such filing.

EX-99.1

Exhibit 99.1

THIRD PARTY REPORT ON RESERVES

By McDaniel & Associates Consultants Ltd. ("McDaniel") - (Independent Qualified Reserves Evaluator)

This report is provided to satisfy the requirements contained in Item 1202(a)(8) of U.S. Securities and Exchange Commission Regulation S-K with respect to Gran Tierra Energy Inc,’s (“Gran Tierra”) oil and gas reserves as December 31, 2020, and to provide the qualifications of the technical person primarily responsible for overseeing the reserve estimation process.

The numbering of items below corresponds to the requirements set out in Item 1202(a)(8) of Regulation S-K. Terms to which a meaning is ascribed in Regulation S-K and Regulation S-X have the same meaning in this report.

i.We have prepared an independent estimate of the oil and gas reserves of Gran Tierra for the management and the board of directors of Gran Tierra. The primary purpose of our evaluation report was to provide estimates of reserves information in support of Gran Tierra’s year-end reserves reporting requirements under US Securities Regulation S-K and for other internal business and financial needs of Gran Tierra.

ii.We estimated the reserves of Gran Tierra as at December 31, 2020. The completion date of our report is January 26, 2021.

iii.McDaniel evaluated 100% of the reserves of Gran Tierra.

The following table sets forth the net after royalty reserves of Gran Tierra:

Category	Crude Oil Mbbl	Natural Gas MMcf	Oil Equivalent MBOE (1)	Portion of Reserves Evaluated, %
Proved
Developed
Colombia	38,660	633	38,766	100
Undeveloped
Colombia	26,032	1,022	26,202	100
Total Proved	64,692	1,655	64,968	100
Probable
Developed
Colombia	16,818	96	16,834	100
Undeveloped
Colombia	26,997	1,044	27,171	100
Total Probable	43,815	1,140	44,005	100
Possible
Developed
Colombia	14,145	205	14,179	100
Undeveloped
Colombia	29,171	1,206	29,372	100
Total Possible	43,316	1,411	43,551	100

(1) Oil equivalence factors: Crude Oil 1 bbl/bbl, Natural Gas 6 Mcf/bbl.

iv.As noted in item iii., our evaluation covered 100% of the reserves of Gran Tierra. The assumptions, methods and procedures followed in the evaluation reflect the standards set out in the Canadian Oil and Gas Evaluation Handbook (the "COGE Handbook") modified as necessary to conform to the standards under the U.S. Financial AccountingStandards Board policies (the “FASB Standards”) and. the U.S. Securities and Exchange Commission Regulations (“SEC requirements”).

Data used in our evaluation of Gran Tierra's reserves was obtained from regulatory agencies, public sources and from Gran Tierra personnel and Gran Tierra files. In the preparation of our report we have accepted as presented, and have relied, without independent verification, upon a variety of information furnished by Gran Tierra such as interests and burdens on properties, recent production volumes, product transportation and marketing and sales agreements, historical revenue, capital costs, operating expense data, budget forecasts and capital cost estimates and well data for recently drilled wells. If in the course of our evaluation, the validity or sufficiency of any material information was brought into question, we did not rely on such information until such concerns were resolved to our satisfaction.

Gran Tierra warranted in a representation letter to us that, to the best of its knowledge and belief, all data furnished to us was accurate in all material respects, and no material data relevant to our evaluation was omitted.

A field examination of the evaluated properties was not performed nor was it considered necessary for the purposes of our report.

In our opinion, estimates provided in our report have, in all material respects, been determined in accordance with the applicable industry standards, and results provided in our report and summarized herein are appropriate for inclusion in filings under Regulation S-K.

v.As required under SEC Regulation S-X, reserves are those quantities of oil and gas that are estimated to be economically producible under existing economic conditions. The primary economic assumptions relate to pricing, capital and operating costs, recoverable volumes and production forecasts.

As specified, in determining economic production, constant product benchmark prices are to be based on a 12-month average price, calculated as the unweighted arithmetic average of the first-day-of-the-month price for each month within the 12-month period prior to the effective date of our report unless prices are defined by contractual or other regulatory arrangements. The relevant benchmark prices for Gran Tierra's reserves is Brent Blend Crude Oil FOB North Sea at $43.43 USD/bbl.

The product prices that were used to determine the future gross revenue for each property reflect adjustments to the benchmark prices for gravity, quality, local conditions, and/or distance from market, referred to herein as “differentials.” The differentials used in the preparation of this report estimated from received price information provided by Gran Tierra.

The average realized prices for Gran Tierra's reserves in the report are:

Oil (USD/bbl) - Colombia	$	35.33
Natural Gas (USD/Mcf) - Colombia	$	3.67

In our economic analysis, operating and capital costs are those costs estimated as applicable at the effective date of our report, with no future escalation. Where deemed appropriate, the capital costs and revised operating costs associated with the implementation of committed projects designed to modify specific field operations in the future may be included in economic projections. Capital costs used in this report were provided by Gran Tierra and actual costs from recent activity. Capital costs are included as required for workovers, new development wells, and production equipment. Based on our understanding of future development plans, a review of the records provided to us, and our knowledge of similar properties, we regard these estimated capital costs to be reasonable. Abandonment costs were assigned to the abandonment of wells assigned reserves, including future wells.

Reserves were assigned by volumetric, material balance, decline analysis or analogy where considered appropriate. In many cases, where sufficient data were available, a combination of the methods were applied.

Test data and other related information were used to estimate the anticipated initial production rates for those wells or analogous locations. For reserves not yet on production, forecast sales were estimated to commence at an anticipated

date furnished by Gran Tierra. Wells or locations that are not currently producing may start producing earlier or later than anticipated in our estimates due to unforeseen factors causing a change in the timing to initiate production. Such factors may include delays due to weather, the availability of rigs, the sequence of drilling, completing and/or recompleting wells and/or constraints set by regulatory bodies.

The future production rates from wells currently on production or wells or locations that are not currently producing may be more or less than estimated because of changes including, but not limited to, reservoir performance, operating conditions related to surface facilities, compression and artificial lift, pipeline capacity and/or operating conditions, producing market demand and/or allowables or other constraints set by regulatory bodies.

vi. Our report has been prepared assuming the continuation of existing regulatory and fiscal conditions subject to the guidance in the COGE Handbook and SEC regulations. Notwithstanding that Gran Tierra currently has regulatory approval to produce the reserves identified in our report, there is no assurance that changes in regulation will not occur; such changes, which cannot reliably be predicted, could impact Gran Tierra's ability to recover the estimated reserves.

vii. Oil and gas reserves estimates have an inherent degree of associated uncertainty the extent of which is affected by many factors. Reserves estimates will vary due to the limited and imprecise nature of data upon which the estimates of reserves are predicated. Moreover, the methods and data used in estimating reserves are often necessarily indirect or analogical in character rather than direct or deductive. Furthermore, the persons involved in the preparation of reserves estimates and associated information are required, in applying geosciences, petroleum engineering and evaluation principles, to make numerous unbiased judgments based upon their educational background, professional training, and professional experience. The extent and significance of the judgments to be made are, in themselves, sufficient to render reserves estimates inherently imprecise. Reserves estimates may change substantially as additional data becomes available and as economic conditions impacting oil and gas prices and costs change. Reserves estimates will also change over time due to other factors such as knowledge and technology, fiscal and economic conditions, contractual, statutory and regulatory provisions. 

viii.In our opinion, the reserves information evaluated by us have, in all material respects, been determined in accordance with all appropriate data, assumptions, methods and procedures applicable for the filing of reserves information under U.S. SEC Regulation S-K. All methods and procedures we considered necessary under the circumstances to prepare the report were used.

ix.A summary of Gran Tierra's reserves evaluated by us is provided in item iii. 

McDaniel is a private firm established in 1955 whose business is the provision of independent geological and engineering services to the petroleum industry. McDaniel is among the largest evaluation firms in North America with over 60 professional and technical support personnel. Mr. Boulton coordinated the evaluation and is a qualified, independent reserves evaluator as defined in COGE Handbook, and a registered Practicing Professional Engineer in the Province of Alberta. Mr. Boulton has over 10 years of experience in the evaluation of oil and gas reserves and resources and has been employed at McDaniel as an evaluator/auditor since 2006.

McDaniel & Associates Consultants Ltd.

2200, 255 - 5 Avenue S.W.

Bow Valley Square 3

Calgary, Alberta, Canada T2P 3G6

Dated: February 24, 2021

/s/ Cam Boulton

Cam Boulton

Executive Vice President

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Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Feb. 19, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-34018
Entity Registrant Name	GRAN TIERRA ENERGY INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	98-0479924
Entity Address, Address Line One	900, 520 - 3 Avenue SW
Entity Address, City or Town	Calgary,
Entity Address, State or Province	AB
Entity Address, Country	CA
Entity Address, Postal Zip Code	T2P 0R3
City Area Code	403
Local Phone Number	265-3221
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	GTE
Security Exchange Name	NYSEAMER
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 96.8
Entity Common Stock, Shares Outstanding		366,981,556
Documents Incorporated by Reference	The information required by Part III of this report, to the extent not set forth herein, is incorporated by reference from the registrant’s definitive proxy statement relating to the 2021 annual meeting of stockholders, which definitive proxy statement will be filed with the Securities and Exchange Commission within 120 days after December 31, 2020.
Entity Central Index Key	0001273441
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false

XML

Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
OIL SALES (NOTE 11)	$ 237,838,000	$ 570,983,000
EXPENSES
Operating	111,888,000	183,204,000
Transportation	10,543,000	20,400,000
COVID-19 related costs (Note 12)	2,679,000	0
Depletion, depreciation and accretion (Note 5)	164,233,000	225,033,000
Goodwill impairment (Note 6)	102,581,000	0
Asset impairment (Note 6)	564,495,000	0
General and administrative	23,722,000	34,730,000
Severance	1,628,000	1,771,000
Foreign exchange loss	4,184,000	627,000
Financial instruments loss (gain) (Note 15)	50,982,000	(46,215,000)
Interest expense (Note 8)	54,140,000	43,268,000
TOTAL EXPENSES	1,091,075,000	462,818,000
OTHER LOSS	(469,000)	(12,886,000)
INTEREST INCOME	345,000	696,000
(LOSS) INCOME BEFORE INCOME TAXES	(853,361,000)	95,975,000
INCOME TAX EXPENSE (RECOVERY)
Current (Note 13)	754,000	17,058,000
Deferred (Note 13)	(76,148,000)	40,227,000
INCOME TAX EXPENSE (RECOVERY)	(75,394,000)	57,285,000
NET AND COMPREHENSIVE (LOSS) INCOME	$ (777,967,000)	$ 38,690,000
NET (LOSS) INCOME PER SHARE - BASIC AND DILUTED (in USD per share)	$ (2.12)	$ 0.10
WEIGHTED AVERAGE SHARES OUTSTANDING - BASIC (Note 9) (in shares)	366,981,556	376,495,306
WEIGHTED AVERAGE SHARES OUTSTANDING - DILUTED (Note 9) (in shares)	366,981,556	376,507,812

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Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 13,687	$ 8,301
Restricted cash and cash equivalents (Note 10)	427	516
Accounts receivable (Note 3)	8,044	36,291
Investment (Note 15)	48,323	94,741
Taxes receivable (Note 4)	49,962	135,838
Other current assets	13,459	15,001
Total Current Assets	133,902	290,688
Oil and Gas Properties (using the full cost method of accounting)
Proved	797,355	1,258,934
Unproved	161,763	310,809
Total Oil and Gas Properties	959,118	1,569,743
Other capital assets	5,364	7,650
Total Property, Plant and Equipment (Note 5)	964,482	1,577,393
Other Long-Term Assets
Taxes receivable (Note 4)	42,635	25,869
Deferred tax assets (Note 13)	57,318	44,003
Other long-term assets	3,425	4,130
Goodwill (Note 6)	0	102,581
Total Other Long-Term Assets	103,378	176,583
Total Assets	1,201,762	2,044,664
Current Liabilities
Accounts payable and accrued liabilities (Note 7)	100,784	195,513
Derivatives (Note 15)	12,050	775
Taxes payable	37	0
Equity compensation award liability (Note 9 and 15)	805	3,053
Total Current Liabilities	113,676	199,341
Long-Term Liabilities
Long-term debt (Note 8)	774,770	700,459
Deferred tax liabilities (Note 13)	0	59,762
Asset retirement obligation (Note 10)	48,214	43,419
Equity compensation award liability (Note 9 and 15)	3,955	4,806
Other long-term liabilities	4,113	4,267
Total Long-Term Liabilities	831,052	812,713
Commitments and Contingencies (Note 14)
Shareholders’ Equity
Common Stock (Note 9) (366,981,556 and 366,981,556 shares of Common Stock, par value $0.001 per share, issued and outstanding as at December 31, 2020 and December 31, 2019, respectively)	10,270	10,270
Additional paid in capital	1,285,018	1,282,627
Deficit	(1,038,254)	(260,287)
Total Shareholders’ Equity	257,034	1,032,610
Total Liabilities and Shareholders’ Equity	$ 1,201,762	$ 2,044,664

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Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Common shares, issued (in shares)	366,981,556	366,981,556
Common shares, outstanding (in shares)	366,981,556	366,981,556
Common shares, par value (in USD per share)	$ 0.001	$ 0.001

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Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net (loss) income	$ (777,967,000)	$ 38,690,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depletion, depreciation and accretion (Note 5)	164,233,000	225,033,000
Goodwill impairment (Note 6)	102,581,000	0
Asset impairment (Note 6)	564,495,000	0
Deferred tax (recovery) expense (Note 13)	(76,148,000)	40,227,000
Stock-based compensation (Note 9)	1,216,000	1,430,000
Amortization of debt issuance costs (Note 8)	3,625,000	3,376,000
Non-cash lease expenses	1,951,000	1,806,000
Lease payments	(1,926,000)	(1,969,000)
Unrealized foreign exchange loss	5,271,000	1,803,000
Financial instruments loss (gain) (Note 15)	50,982,000	(46,215,000)
Cash settlement of financial instruments	4,874,000	(3,273,000)
Cash settlement of asset retirement obligation (Note 10)	(201,000)	(870,000)
Other non-cash loss	2,026,000	0
Loss on redemption of Convertible Notes	0	11,501,000
Net change in assets and liabilities from operating activities (Note 16)	36,062,000	(93,874,000)
Net cash provided by operating activities	81,074,000	177,665,000
Investing Activities
Additions to property, plant and equipment (Note 5)	(96,281,000)	(379,314,000)
Property acquisitions (Note 5)	0	(77,772,000)
Changes in non-cash investing working capital	(48,642,000)	(7,851,000)
Net cash used in investing activities	(144,923,000)	(464,937,000)
Financing Activities
Proceeds from issuance of Senior Notes, net of issuance costs (Note 8)	0	289,271,000
Proceeds from bank debt, net of issuance costs	88,332,000	342,575,000
Repayment of debt	(17,000,000)	(349,219,000)
Lease payments	(879,000)	0
Repurchase of shares of Common Stock (Note 9)	0	(37,561,000)
Net cash provided by financing activities	70,453,000	245,066,000
Foreign exchange loss on cash and cash equivalents and restricted cash and cash equivalents	(156,000)	(1,027,000)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents	6,448,000	(43,233,000)
Cash and cash equivalents and restricted cash and cash equivalents, beginning of year (Note 16)	11,075,000	54,308,000
Cash and cash equivalents and restricted cash and cash equivalents, end of year (Note 16)	$ 17,523,000	$ 11,075,000

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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Share Capital	Additional Paid in Capital	Deficit	Deficit Cumulative Effect, Period of Adoption, Adjustment
Balance, beginning of year at Dec. 31, 2018		$ 10,290	$ 1,318,048	$ (298,588)	$ (389)
Increase (Decrease) in Stockholders' Equity
Repurchase of Common Stock (Note 9)		(20)	(37,541)
Stock-based compensation (Note 9)			2,120
Net (loss) income	$ 38,690			38,690
Balance, end of year at Dec. 31, 2019	1,032,610	10,270	1,282,627	(260,287)	$ 0
Increase (Decrease) in Stockholders' Equity
Repurchase of Common Stock (Note 9)		0	0
Stock-based compensation (Note 9)			2,391
Net (loss) income	(777,967)			(777,967)
Balance, end of year at Dec. 31, 2020	$ 257,034	$ 10,270	$ 1,285,018	$ (1,038,254)

XML

Description of Business

12 Months Ended

Dec. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business

Description of Business

Gran Tierra Energy Inc., a Delaware corporation (the “Company” or “Gran Tierra”), is a publicly traded company focused on international oil and natural gas exploration and production with assets currently in Colombia and Ecuador.

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Significant Accounting Policies

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Significant Accounting Policies

Significant Accounting Policies

The consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”).

Significant accounting policies are:

Basis of Consolidation

These consolidated financial statements include the accounts of the Company and its controlled subsidiaries. All intercompany accounts and transactions have been eliminated.

Use of Estimates

The preparation of financial statements in conformity with 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 consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates made by management include: oil and natural gas reserves and related present value of future cash flows; depreciation, depletion, amortization (“DD&A”) and impairment; impairment assessments of goodwill; timing of transfers from oil and gas properties not subject to depletion to the depletable base; asset retirement obligations; determining the value of the consideration transferred and the net identifiable assets acquired and liabilities assumed in connection with business combinations and determining goodwill; assessments of the likely outcome of legal and other contingencies; income taxes; stock-based compensation; and determining the fair value of derivatives. Although management believes these estimates are reasonable, changes in facts and circumstances or discovery of new information may result in revised estimates and actual results may differ from these estimates.

Cash and Cash Equivalents

The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents.

Restricted Cash and Cash Equivalents

Restricted cash and cash equivalents comprises cash and cash equivalents pledged to secure letters of credit and to settle asset retirement obligations. Letters of credit currently secured by cash relate to work commitment guarantees contained in exploration contracts. Restrictions will lapse when work obligations are satisfied pursuant to the exploration contract or an asset retirement obligation is settled. Cash and claims to cash that are restricted as to withdrawal or use for other than current operations or are designated for expenditure in the acquisition or construction of long-term assets are excluded from the current asset classification. The long-term portion of restricted cash and cash equivalents is included in other long-term assets on the Company's balance sheet.

Allowance for Doubtful Accounts

At each reporting date, the Company assesses the expected lifetime credit losses on initial recognition of trade accounts receivable. Credit risk is assessed based on the number of days the receivable has been outstanding and the internal credit assessment of the customer. The expected loss rates are based on payment profiles over a period of 36 months prior to the period-end and the corresponding historical credit losses experienced within this period. Historical loss rates are adjusted to

reflect current and forward looking economic factors of the country where the Company sells oil that affect the ability of the customers to settle the receivables. Trade receivables are written off when there is no reasonable expectation of recovery.

Investment in PetroTal Corp.

During December 2017, the Company acquired an investment in common shares of PetroTal Corp. ("PetroTal") in connection with the sale of its Peru business unit. At December 31, 2020, this investment represented approximately 30% of PetroTal's issued and outstanding common shares. The Company determined that it did not have a controlling financial interest in PetroTal, but could exert significant influence over PetroTal's operating and financial policies as a result of its ownership interest in PetroTal and the right to nominate two directors to PetroTal's board of directors. Accordingly, Gran Tierra accounted for its investment in the common shares of PetroTal as an equity method investment, but elected the fair value option for this investment to reflect the value that market participants would use to value the investment. The fair value of the investment in PetroTal's common shares is recorded as "Investment" on the Company's consolidated balance sheet, and the change in fair value is recorded in the consolidated statements of operations as financial instruments gains or losses. As at December 31, 2020, we held 246,100,000 common shares of PetroTal and subsequent to December 31, 2020 we disposed of 109,006,250 common shares resulting in 137,093,750 common shares held (17% of all total outstanding shares).

Derivatives

The Company records derivative instruments on its balance sheet at fair value as either an asset or liability with changes in fair value recognized in the consolidated statements of operations as financial instruments gains or losses. While the Company utilizes derivative instruments to manage the price risk attributable to its expected oil production and foreign exchange risk, it has elected not to designate its derivative instruments as accounting hedges under the accounting guidance.

Inventory

Inventory consists of oil in tanks and third party pipelines and supplies and is valued at the lower of cost and net realizable value. The cost of inventory is determined using the weighted average method. Oil inventories include expenditures incurred to produce, upgrade and transport the product to the storage facilities and include operating, depletion and depreciation expenses and cash royalties.

Income Taxes

Income taxes are recognized using the liability method, whereby deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the consolidated financial statements carrying amounts of existing assets and liabilities and their respective tax base, and operating loss and tax credit carry forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences and carryforwards are expected to be recovered or settled. Valuation allowances are provided if, after considering available evidence, it is not more likely than not that some or all of the deferred tax assets will be realized.

The tax benefit from an uncertain tax position is recognized when it is more likely than not, based on the technical merits of the position, that the position will be sustained on examination by the taxing authorities. Additionally, the amount of the tax benefit recognized is the largest amount of benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. In evaluating whether a tax position has met the more-likely-than-not recognition threshold, the Company presumes that the position will be examined by the appropriate taxing authority that has full knowledge of all relevant information. The Company recognizes potential penalties and interest related to unrecognized tax benefits as a component of income tax expense.

Oil and Gas Properties

The Company uses the full cost method of accounting for its investment in oil and natural gas properties as defined by the Securities and Exchange Commission (“SEC”). Under this method, the Company capitalizes all acquisition, exploration and development costs incurred for the purpose of finding oil and natural gas reserves, including salaries, benefits and other internal costs directly attributable to these activities. Costs associated with production and general corporate activities; however, are expensed as incurred. Separate cost centers are maintained for each country in which the Company incurs costs.

The Company computes depletion of oil and natural gas properties on a quarterly basis using the unit-of-production method based upon production and estimates of proved reserve quantities. Future development costs related to properties with proved reserves are also included in the amortization base for computation of depletion. The costs of unproved properties are excluded from the amortization base until the properties are evaluated. The cost of exploratory dry wells is transferred to proved

properties, and thus is subject to amortization, immediately upon determination that a well is dry in those countries where proved reserves exist.

The Company performs a ceiling test calculation each quarter in accordance with SEC Regulation S-X Rule 4-10. In performing its quarterly ceiling test, the Company limits, on a country-by-country basis, the capitalized costs of proved oil and natural gas properties, net of accumulated depletion and deferred income taxes, to the estimated future net cash flows from proved oil and natural gas reserves discounted at 10%, net of related tax effects, plus the lower of cost or fair value of unproved properties included in the costs being amortized. If such capitalized costs exceed the ceiling, the Company will record a write-down to the extent of such excess as a non-cash charge to net income or loss. Any such write-down will reduce earnings in the period of occurrence and results in a lower DD&A rate in future periods. A write-down may not be reversed in future periods even though higher oil and natural gas prices may subsequently increase the ceiling.

The Company calculates future net cash flows by applying the unweighted average of prices in effect on the first day of the month for the preceding 12-month period, adjusted for location and quality differentials. Such prices are utilized except where different prices are fixed and determinable from applicable contracts for the remaining term of those contracts.

Unproved properties are not depleted pending the determination of the existence of proved reserves. Costs are transferred into the depletable base on an ongoing basis as the properties are evaluated and proved reserves are established or impairment is determined. Unproved properties are evaluated quarterly to ascertain whether impairment has occurred. This evaluation considers, among other factors, seismic data, requirements to relinquish acreage, drilling results and activity, remaining time in the commitment period, remaining capital plans, and political, economic, and market conditions. During any period in which factors indicate an impairment, the cumulative costs incurred to date for such property are transferred to the full cost pool and are then subject to depletion. For countries where a reserve base has not yet been established, the impairment is charged to earnings.

In exploration areas, related seismic costs are capitalized in unproved property and evaluated as part of the total capitalized costs associated with a property. Seismic costs related to development projects are recorded in proved properties and therefore subject to depletion as incurred.

Gains and losses on the sale or other disposition of oil and natural gas properties are not recognized, unless the gain or loss would significantly alter the relationship between capitalized costs and proved reserves of oil and natural gas attributable to a country.

Asset Retirement Obligation

The Company records an estimated liability for future costs associated with the abandonment of its oil and gas properties including the costs of reclamation of drilling sites. The Company records the fair value of a liability for a legal obligation to retire an asset in the period in which the liability is incurred with an offsetting increase to the related oil and gas properties. The fair value of an asset retirement obligation is measured by reference to the expected future cash outflows required to satisfy the retirement obligation discounted at the Company’s credit-adjusted risk-free interest rate. Accretion expense is recognized over time as the discounted liabilities are accreted to their expected settlement value, while the asset retirement cost is amortized over the estimated productive life of the related assets. The accretion of the asset retirement obligation and amortization of the asset retirement cost are included in DD&A. If estimated future costs of an asset retirement obligation change, an adjustment is recorded to both the asset retirement obligation and oil and gas properties. Revisions to the estimated asset retirement obligation can result from changes in retirement cost estimates, revisions to estimated inflation rates and changes in the estimated timing of abandonment.

Other Capital Assets

Other capital assets, including additions and replacements, are recorded at cost upon acquisition and include furniture, fixtures and leasehold improvement, computer equipment, automobiles and right-of-use assets for operating and finance leases. Depreciation for furniture and fixtures, computer equipment and automobiles is provided using the straight-line method over the useful life of the asset. Leasehold improvements and right-of-use assets for operating and finance leases are depreciated on a straight-line basis over the shorter of the estimated useful life and the term of the related lease. The cost of repairs and maintenance is charged to expense as incurred.

Goodwill

Goodwill represents the excess of the aggregate of the consideration transferred over the net identifiable assets acquired and liabilities assumed. The Company assesses qualitative factors annually, or more frequently if necessary, to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount and whether it is necessary to perform the goodwill impairment test. The impairment test requires allocating goodwill and certain other assets and liabilities to assigned reporting units. The fair value of each reporting unit is estimated and compared with its net book value. An impairment loss is recognized if the estimated fair value of the reporting unit is less than its carrying amount, not exceeding the carrying amount of goodwill allocated to that reporting unit. Because quoted market prices are not available for the Company’s reporting unit, the fair value of the reporting unit is estimated based upon estimated future cash flows of the reporting unit. The goodwill relates entirely to Colombia. The Company performed step 1 of the goodwill impairment test for the year-ended December 31, 2020 which resulted in a full write-down of goodwill.

Leases

At inception of a contract, the Company assesses whether a contract is, or contains, a lease. A contract is, or contains, a lease if the contract conveys the right to control the use of an identified asset for a period of time in exchange for consideration. At inception of a contract that contains a lease component, the Company allocates the consideration in the contract to each lease and non-lease component on the basis of their relative stand-alone prices. The Company recognizes a right-of-use asset and a lease liability at the lease commencement date. The right-of-use asset is initially measured at cost, and subsequently at cost less any accumulated depreciation and impairment losses, and adjusted for certain remeasurements of the lease liability.

The lease liability is initially measured at the present value of the lease payments that are not paid at the commencement date, discounted using the interest rate implicit in the lease or, if that rate cannot be readily determined, the Company's incremental borrowing rate. Generally, the Company uses its incremental borrowing rate as the discount rate. The lease liability is subsequently increased by the interest cost on the lease liability and decreased by lease payments made. It is remeasured when there is a change in future lease payments arising from a change in an index or rate, a change in the estimate of the amount expected to be payable under a residual value guarantee, or as appropriate, changes in the assessment of whether a purchase or extension option is reasonably certain to be exercised or a termination option is reasonably certain not to be exercised.

The Company has applied judgment to determine the lease term for contracts which include renewal or termination options. The assessment of whether the Company is reasonably certain to exercise such options impacts the lease term, which significantly affects the amount of lease liabilities and right-of-use assets recognized.

All leases identified as part of the transition on January 1, 2019 relate to office leases. The transition resulted in the recognition of a right-of-use asset presented in other capital assets of $3.8 million at January 1, 2019, the recognition of lease liabilities of $4.2 million and a $0.4 million impact on retained earnings. When measuring the lease liabilities, the Company's incremental borrowing rate was used. At January 1, 2019 the rates applied ranged between 5.6% and 9.1%.

Revenue from Contracts with Customers

The Company's revenue relates to oil sales in Colombia. The Company recognizes revenue when it transfers control of the product to a customer. This generally occurs at the time the customer obtains legal title to the product and when it is physically transferred to the delivery point agreed with the customer. Payment terms are generally within three business days following delivery of an invoice to the customer. Revenue is recognized based on the consideration specified in contracts with customers. Revenue represents the Company's share and is recorded net of royalty payments to governments and other mineral interest owners.

The Company evaluates its arrangement with third parties and partners to determine if the Company acts as a principal or an agent. In making this evaluation, management considers if the Company obtains control of the product delivered, which is indicated by the Company having the primary responsibility for the delivery of the product, having ability to establish prices or having inventory risk. If the Company acts in the capacity of an agent rather than as a principal in transaction, then the revenue is recognized on a net-basis, only reflecting the fee realized by the Company from the transaction.

Tariffs, tolls and fees charged to other entities for use of pipelines owned by the Company are evaluated by management to determine if these originate from contracts with customers or from incidental arrangements. When determining if the Company acted as a principal or as an agent in transactions, management determines if the Company obtains control of the product. As part of this assessment, management considers criteria for revenue recognition set out in ASC 606.

Stock-based Compensation

The Company records stock-based compensation expense in its consolidated financial statements measured at the fair value of the awards that are ultimately expected to vest. Fair values are determined using pricing models such as the Black-Scholes-Merton or Monte Carlo simulation stock option-pricing models and/or observable share prices. For equity-settled stock-based compensation awards, fair values are determined at the grant date and the expense, net of estimated forfeitures, is recognized using the accelerated method over the requisite service period. An adjustment is made to compensation expense for any difference between the estimated forfeitures and the actual forfeitures. For cash-settled stock-based compensation awards, fair values are determined at each reporting date and periodic changes are recognized as compensation costs, with a corresponding change to liabilities.

The Company uses historical data to estimate the expected term used in the Black-Scholes option pricing model, option exercises and employee departure behavior. Expected volatilities used in the fair value estimate are based on the historical volatility of the Company’s shares. The risk-free rate for periods within the expected term of the stock options is based on the U.S. Treasury yield curve in effect at the time of grant.

Stock-based compensation expense is capitalized as part of oil and natural gas properties or expensed as part of general and administrative (“G&A”) or operating expenses, as appropriate.

Foreign Currency Translation

The functional currency of the Company, including its subsidiaries, is the United States dollar. Monetary items are translated into the reporting currency at the exchange rate in effect at the balance sheet date and non-monetary items are translated at historical exchange rates. Revenue and expense items are translated in a manner that produces substantially the same reporting currency amounts that would have resulted had the underlying transactions been translated on the dates they occurred.

DD&A expense on assets is translated at the historical exchange rates similar to the assets to which they relate. Gains and losses resulting from foreign currency transactions, which are transactions denominated in a currency other than the entity’s functional currency, are recognized in net income or loss.

Earnings (Loss) per Share

Basic earnings (loss) per share is calculated by dividing net income or loss attributable to common shareholders by the weighted average number of shares of Common Stock and exchangeable shares issued and outstanding during each period. Diluted net income or loss per share is calculated by adjusting the weighted average number of shares of Common Stock and exchangeable shares outstanding for the dilutive effect, if any, of share equivalents. The Company uses the treasury stock method to determine the dilutive effect. This method assumes that all Common Stock equivalents have been exercised at the beginning of the period (or at the time of issuance, if later), and that the funds obtained thereby were used to purchase shares of Common Stock of the Company at the volume weighted average trading price of shares of Common Stock during the period.

Recently Adopted Accounting Pronouncements

Financial Instruments - Credit Losses (ASC 326)

In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses". This ASU replaces the incurred loss impairment methodology with a methodology that reflects expected credit losses and requires a broader range of reasonable and supportable information to support credit loss estimates. In December 2019, the FASB issued ASU 2019-10, "Financial Instruments - Credit Losses, Derivatives and Hedging and Leases", which is codification improvement of ASU 2016-13. The Company adopted this ASU on January 1, 2020, the adoption of which had no material impact on the Company's consolidated balance sheet, results of operations or cash flows.

Risks and Measurement Uncertainty

In March 2020, the outbreak of the COVID-19 virus, which was declared a pandemic by the World Health Organization, has spread across the globe and impacted worldwide economic activity. In addition, global commodity prices declined significantly due to disputes between major oil producing countries combined with the impact of the COVID-19 pandemic and associated reductions in global demand for oil. Governments worldwide, including those in Colombia and Ecuador, the countries where the Company operates, enacted emergency measures to combat the spread of the virus. These measures, which include the implementation of travel bans, self-imposed quarantine periods and physical distancing, caused material disruption to

businesses globally resulting in an economic slowdown. Governments and central banks have reacted with significant monetary and fiscal interventions designed to stabilize economic conditions; however, the success of these interventions is not currently determinable. The current challenging economic climate is having and may continue to have significant adverse impacts on the Company including, but not exclusively:

•material declines in revenue and cash flows as a result of the decline in commodity prices;

•declines in revenue and operating activities due to reduced capital programs and the shut-in of production;

•impairment charges (see Note 6);

•inability to comply with covenants and restrictions in debt agreements;

•inability to access financing sources;

•increased risk of non-performance by the Company’s customers and suppliers;

•interruptions in operations as the Company adjusts personnel to the dynamic environment; and

•inability to operate or delay in operations as a result COVID-19 restrictions in the countries in which the Company operates.

The unprecedented decline in oil prices has materially reduced the Company’s forecasted EBITDAX and the estimated value of its oil reserves. Based on current forecasted Brent pricing and production levels, which can change materially in very short time frames, the Company is forecasted to be in compliance with the amended financial covenants contained in the Company's Senior Secured Credit Facility (the "revolving credit facility") for at least the next year from the date of these financial statements. The amount available under the Company’s senior secured credit facility is based on the lenders determination of the borrowing base. The borrowing base is determined, by the lenders, based on the Company’s reserves and commodity prices. The next renewal of the borrowing base is scheduled for May 2021 and there is risk that the borrowing base may be reduced by the lenders. In addition, the Company’s ability to borrow under the credit facility may be limited by the terms of the indentures for the 6.25% Senior Notes and 7.75% Senior Notes.

The risk of non-compliance with the covenants in the lending agreements and the risk associated with maintaining the borrowing base is heightened in the current period of volatility coupled with the unprecedented disruption caused by the COVID-19 pandemic. Management currently expects that the Company will continue to meet the terms of the credit facility or obtain further amendments or waivers if and when required. The Company also expects to be able to maintain the borrowing base at a level in excess of the amount borrowed. However, there can be no assurances that the Company’s liquidity can be maintained at or above current levels during this period of volatility and global economic uncertainty.

The situation is dynamic and the ultimate duration and magnitude of the impact on the economy and the financial effect on the Company is not known at this time. Estimates and judgments made by management in the preparation of the financial statements are increasingly difficult and subject to a higher degree of measurement uncertainty during this volatile period. In the near term, matters in these financial statements that are most subject to be impacted by this volatile period are the Company's assessment of liquidity and access to capital, the carrying value of long-lived assets and the valuation of the deferred tax assets.

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Accounts Receivable

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Accounts Receivable

Accounts Receivable

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
Trade	$	3,799	$	24,890
Other	4,245		11,401
Total Accounts Receivable	$	8,044	$	36,291

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Taxes Receivable

12 Months Ended

Dec. 31, 2020

Tax Receivable Agreement [Abstract]

Taxes Receivable

Taxes Receivable

The table below shows the break-down of taxes receivable which are comprised of value added tax ("VAT") and income tax receivables.

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Current
VAT Receivable	$	35,977	$	92,777
Income Tax Receivable	13,985		43,061
	$	49,962	$	135,838
Long-Term
VAT Receivable	$	28,485	$	25,869
Income Tax Receivable	14,150		—
	$	42,635	$	25,869
Total Taxes Receivable	$	92,597	$	161,707

The following table shows the movement of VAT and income tax receivables for the past two years:

(Thousands of U.S. Dollars)	VAT Receivable		Income Tax Receivable		Total Taxes Receivable
Balance, December 31, 2018	$	72,497	$	1,613	$	74,110
Collected through sales contracts	(18,197)		—		(18,197)
Taxes paid	65,114		58,494		123,608
Current tax expense	—		(17,058)		(17,058)
Foreign exchange loss	(768)		12		(756)
Balance, December 31, 2019	$	118,646	$	43,061	$	161,707
Collected through direct government refunds	(40,884)		(26,471)		(67,355)
Collected through sales contracts	(46,326)		—		(46,326)
Taxes paid	43,719		14,648		58,367
Current tax expense	—		(754)		(754)
Foreign exchange loss	(10,693)		(2,349)		(13,042)
Balance, December 31, 2020	$	64,462	$	28,135	$	92,597

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Property, Plant and Equipment

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
Oil and natural gas properties
Proved	$	4,106,768	$	3,850,565
Unproved	161,763		310,809
	4,268,531		4,161,374
Other (1)	32,135		30,255
	4,300,666		4,191,629
Accumulated depletion, depreciation and impairment	(3,336,184)		(2,614,236)
	$	964,482	$	1,577,393

(1) The "other" category includes $11.4 million right-of-use assets for operating and finance leases which had a net book value of $4.4 million as at December 31, 2020 (December 31, 2019 - $9.7 million which had a net book value of $5.7 million).

Depletion and depreciation expense on property, plant and equipment for the year ended December 31, 2020, was $160.8 million (2019 - $220.8 million). A portion of depletion and depreciation expense was recorded as oil inventory in each year.

2019 Acquisitions

On February 20, 2019, the Company acquired 36.2% working interest ("WI") in the Suroriente Block and a 100% WI of the Llanos-5 Block for cash consideration of $79.1 million and a promissory note of $1.5 million included in current accounts payable on the Company's consolidated balance sheet. The cost of the assets was allocated to proved properties using relative fair values.

(Thousands of U.S. Dollars)	2019
Cost of Asset Acquisition:
Cash	$	79,100
Promissory note	1,500
	$	80,600
Allocation of Consideration Paid:
Oil and gas properties
Proved	$	52,530
Unproved	44,768
	97,298
Net working capital (including cash acquired of $5.3 million)	(16,698)
	$	80,600

Unproved Oil and Natural Gas Properties

At December 31, 2020, unproved oil and natural gas properties consist of exploration lands held in Colombia and Ecuador. Unproved oil and natural gas properties are being held for their exploration value and are not being depleted pending determination of the existence of proved reserves. Gran Tierra will continue to assess the unproved properties over the next several years as proved reserves are established and as exploration warrants whether or not future areas will be developed. The Company expects that approximately 100% of costs not subject to depletion at December 31, 2020, will be transferred to the depletable base within the next five years.

The following is a summary of Gran Tierra’s oil and natural gas properties not subject to depletion as at December 31, 2020:

	Costs Incurred in
(Thousands of U.S. Dollars)	2020		2019		Prior to 2019		Total
Acquisition costs - Colombia	$	—	$	5,582	$	32,558	$	38,140
Exploration costs - Colombia	4,652		57,328		56,429		118,409
Exploration costs - Ecuador	2,006		3,208		—		5,214
	$	6,658	$	66,118	$	88,987	$	161,763

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Impairment

12 Months Ended

Dec. 31, 2020

Impairment Disclosure [Abstract]

Impairment

Impairment

Asset Impairment

Asset impairment for the years ended December 31, 2020 and 2019, was as follows:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Impairment of oil and gas properties	$	560,344	$	—
Impairment of inventory	4,151		—
	$	564,495	$	—

(i)Oil and gas property impairment

For the year ended December 31, 2020, Gran Tierra recorded ceiling test impairment losses of $560.3 million as a result of lower oil prices. The Company follows the full cost method of accounting for its oil and gas properties. Under this method, the net book value of properties on a country-by-country basis, less related deferred income taxes, may not exceed a calculated “ceiling”. The ceiling is the estimated after-tax future net revenues from proved oil and gas properties, discounted at 10% per year. In calculating discounted future net revenues, oil and natural gas prices are determined using the average price for the 12-month period prior to the ending date of the period covered by the balance sheet, calculated as an unweighted arithmetic average of the first-day-of-the-month price for each month within such period. That average price is then held constant, except for changes which are fixed and determinable by existing contracts. Therefore, ceiling test estimates are based on historical prices discounted at 10% per year and it should not be assumed that estimates of future net revenues represent the fair market value of the Company's reserves. In accordance with GAAP, Gran Tierra used an average Brent price of $43.43 per bbl for the purposes of the December 31, 2020 ceiling test calculations (December 31, 2019 - $64.20 per bbl). There was no ceiling test impairment for the year ended December 31, 2019. Gran Tierra's total proved oil and gas reserves decreased 4% from the prior year.

(ii)Inventory impairment

For the year ended December 31, 2020, the Company recorded $4.2 million, relating to the impairment of oil inventory due to the decline in commodity pricing. There was no inventory impairment for the year ended December 31, 2019.

Goodwill Impairment

For the year ended December 31, 2020, the Company recorded $102.6 million of goodwill impairment relating to its Colombia business unit. The impairment was due to the carrying value of the unit exceeding its fair value as a result of the impact of lower forecasted commodity prices. The estimated fair value of the Colombia business unit for the goodwill impairment test was based on the discounted after-tax cash flows associated with the proved and probable reserves of the reporting unit. There was no goodwill impairment for the year ended December 31, 2019.

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Accounts Payable and Accrued Liabilities

12 Months Ended

Dec. 31, 2020

Payables and Accruals [Abstract]

Accounts Payable and Accrued Liabilities

Accounts Payable and Accrued Liabilities

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Trade	$	70,450	$	151,747
Royalties	1,570		5,758
Employee compensation	1,701		6,861
Other	27,063		31,147
	$	100,784	$	195,513

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Debt and Debt Issuance Costs

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Debt and Debt Issuance Costs

Debt and Debt Issuance Costs

The Company's debt at December 31, 2020 and 2019, was as follows:

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
6.25% Senior Notes	$	300,000	$	300,000
7.75% Senior Notes	300,000		300,000
Revolving credit facility	190,000		118,000
Unamortized debt issuance costs	(18,124)		(21,081)
Long-term lease obligation (1)	2,894		3,540
Long-term debt	$	774,770	$	700,459

(1) The current portion of the lease obligation has been included in accounts payable and accrued liabilities on the Company's balance sheet and totaled $3.3 million as at December 31, 2020 (December 31, 2019 - $3.3 million).

Senior Notes

At December 31, 2020, the Company had $300.0 million of 7.75% Senior Notes due 2027 (the “7.75% Senior Notes”) and $300.0 million of 6.25% Senior Notes due 2025 (the “6.25% Senior Notes” and, together with the 7.75% Senior Notes, the “Senior Notes”). The Senior Notes are fully and unconditionally guaranteed by the Company and certain subsidiaries of the Company that guarantee its revolving credit facility.

The 7.75% Senior Notes bear interest at a rate of 7.75% per year, payable semi-annually in arrears on May 23 and November 23 of each year, beginning on November 23, 2019. The 7.75% Senior Notes will mature on May 23, 2027, unless earlier redeemed or repurchased.

Before May 23, 2023, the Company may, at its option, redeem all or a portion of the 7.75% Senior Notes at 100% of the principal amount plus accrued and unpaid interest and a “make-whole” premium. Thereafter, the Company may redeem all or a portion of the 7.75% Senior Notes plus accrued and unpaid interest applicable to the date of the redemption at the following redemption prices: 2023 - 103.875%; 2024 - 101.938%; 2025 and thereafter - 100%.

The 6.25% Senior Notes bear interest at a rate of 6.25% per year, payable semi-annually in arrears on February 15 and August 15 of each year, beginning on August 15, 2018. The 6.25% Senior Notes will mature on February 15, 2025, unless earlier redeemed or repurchased.

Before February 15, 2022, the Company may, at its option, redeem all or a portion of the 6.25% Senior Notes at 100% of the principal amount plus accrued and unpaid interest and a make-whole premium. Thereafter, the Company may redeem all or a portion of the 6.25% Senior Notes plus accrued and unpaid interest applicable to the date of the redemption at the following redemption prices: 2022 - 103.125%; 2023 - 101.563%; 2024 and thereafter - 100%.

Credit Facility

At December 31, 2020, the Company had a revolving credit facility with a syndicate of lenders with a borrowing base of $215.0 million. Availability under the revolving credit facility is determined by the reserves-based borrowing base determined by the lenders. During the year, as part of semi-annual redeterminations, the borrowing base was reduced from $300.0 million to $225.0 million on June 1, 2020 and was further reduced to $215.0 million on December 7, 2020. The credit facility matures on November 10, 2022. The next re-determination of the borrowing base is due to occur no later than May 2021.

Management has also obtained a relief from compliance with certain financial covenants until October 1, 2021 (the "covenant relief period"), permitting the ratio of total debt to Covenant EBITDAX ("EBITDAX") to be greater than 4.0 to 1.0, Senior Secured Debt to EBITDAX ratio must not exceed 2.5 to 1.0, and EBITDAX to interest expense ratio for the trailing four quarter periods measured as of the last day of the fiscal quarters ending (i) December 31, 2020 and March 31, 2021, must be at least 1.5 to 1.0 (ii) June 30, 2021 and September 30, 2021 must be at least 2.0 to 1.0, and be at least 2.5 to 1.0 thereafter. The Company is required to comply with various covenants, which as disclosed above, have been modified in response to the current market

conditions and the COVID-19 pandemic. As of December 31, 2020, the Company was in compliance with all applicable covenants in the revolving credit facility.

Availability for borrowing or issuance of letters of credit during covenant relief period and until June 29, 2021 was reduced by $15.0 million and starting from June 30, 2021 and until the end of covenant relief period by $20.0 million.

After the expiration of covenant relief period, the Company must maintain compliance with the following financial covenants: limitations on Company's ratio of debt to EBITDAX to a maximum of 4.0 to 1.0; limitations on Company's ratio of Senior Secured Debt to EBITDAX to a maximum of 3.0 to 1.0; and the maintenance of a ratio of EBITDAX to interest expense of at least 2.5 to 1.0. If the Company fails to comply with these financial covenants, and relief from compliance with the covenants was not obtained, it would result in a default under the terms of the credit agreement, which could result in an acceleration of repayment of all indebtedness under the Company's revolving credit facility.

Amounts drawn down under the revolving credit facility bear interest, at the Company's option, at the USD LIBOR rate plus a margin ranging from 2.90% to 4.90% (December 31, 2019 - 1.65% to 3.65%), or an alternate base rate plus a margin ranging from 1.90% to 3.90% (December 31, 2019 - 0.65% to 2.65%), in each case based on the borrowing base utilization percentage. The alternate base rate is currently the U.S. prime rate. Undrawn amounts under the revolving credit facility bear interest from 0.73% to 1.23% (December 31, 2019 - 0.41% to 0.91%) per annum, based on the average daily amount of unused commitments.

The Company’s revolving credit facility is guaranteed by and secured against the assets of certain of the Company’s subsidiaries (the "Credit Facility Group"). Under the terms of the credit facility, the Company is subject to certain restrictions on its ability to distribute funds to entities outside of the Credit Facility Group, including restrictions on the ability to pay dividends to shareholders of the Company.

Interest Expense

The following table presents total interest expense recognized in the accompanying consolidated statements of operations:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Contractual interest and other financing expenses	$	50,515	$	39,892
Amortization of debt issuance costs	3,625		3,376
	$	54,140	$	43,268

The Company incurred debt issuance costs in connection with the issuance of the Senior Notes and its revolving credit facility. As at December 31, 2020, the balance of unamortized debt issuance costs has been presented as a direct deduction against the carrying amount of debt and is being amortized to interest expense using the effective interest method over the term of the debt.

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Share Capital

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Share Capital

Share Capital

	Shares of Common Stock
Balance, December 31, 2018	387,079,027
Shares repurchased and canceled	(20,097,471)
Balance, December 31, 2019 and 2020	366,981,556

The Company’s authorized share capital consists of 595,000,000 shares of capital stock, of which 570,000,000 was designated as Common Stock, par value $0.001 per share and 25,000,000 as Preferred Stock, par value $0.001 per share.

Equity Compensation Awards

The Company has an equity compensation program in place for its executives, employees and directors. Executives and employees are given equity compensation grants that vest based on a recipient's continued employment and in the case of Performance Share Units (“PSUs”), the number of units that vest is dependent upon the achievement of certain key

performance measures. Equity settled awards consist 80% of PSUs and 20% of stock options. The Company’s stock-based compensation awards outstanding as at December 31, 2020, include PSUs, deferred share units (“DSUs”), and stock options.

In accordance with the 2007 Equity Incentive Plan, as amended, the Company’s Board of Directors is authorized to issue options or other rights to acquire shares of the Company’s Common Stock. On June 27, 2012, the shareholders of Gran Tierra approved an amendment to the Company’s 2007 Equity Incentive Plan, which increased the Common Stock available for issuance thereunder from 23,306,100 shares to 39,806,100 shares.

The following table provides information about PSU, DSU and stock option activity for the year ended December 31, 2020:

	PSUs	DSUs	Stock Options
	Number of Outstanding Share Units	Number of Outstanding Share Units	Number of Outstanding Stock Options	Weighted Average Exercise Price /Stock Option ($)
Balance, December 31, 2019	11,371,367	1,251,994	10,612,872	$	2.78
Granted	15,897,575	2,815,903	8,893,140	0.70
Exercised	(2,366,351)	—	—	—
Forfeited	(1,629,187)	—	(1,038,093)	2.04
Expired	—	—	(3,022,970)	3.42
Balance, December 31, 2020	23,273,404	4,067,897	15,444,949	$	1.50
Vested and exercisable, at December 31, 2020			5,443,796	$	2.39
Vested, or expected to vest, at December 31, 2020 through the life of the options			14,938,829	$	1.53

Stock-based compensation expense for the year ended December 31, 2020, was $1.2 million (2019 - $1.4 million) and was primarily recorded in G&A expenses.

At December 31, 2020, there was $5.9 million (December 31, 2019 - $6.7 million) of unrecognized compensation cost related to unvested PSUs and stock options which is expected to be recognized over a weighted average period of 1.7 years. The weighted-average remaining contractual term of options vested, or expected to vest, at December 31, 2020 was 3.2 years.

PSUs

PSUs entitle the holder to receive, at the option of the Company, either the underlying number of shares of the Company's Common Stock upon vesting of such units or a cash payment equal to the value of the underlying shares. PSUs will cliff vest after three years, subject to the continued employment of the grantee. Upon vesting, the underlying number of Common Shares or the cash payment equivalent to their value may range from nil to 200% of the number of PSU's vested, based on the Company’s performance with respect to the applicable performance targets. As at December 31, 2020, 2.7 million (December 31, 2019 - 2.4 million) of PSU's had vested and will be settled in cash. The performance targets for the PSUs outstanding as at December 31, 2020, were as follows:

(i) 50% of the award is subject to targets relating to the total shareholder return (“TSR”) of the Company against a group of

peer companies;

(ii) 25% of the award is subject to targets relating to net asset value ("NAV") of the Company per share and NAV is based on

before tax net present value discounted at 10% of proved plus probable reserves; and

(iii) 25% of the award is subject to targets relating to the execution of corporate strategy.

The compensation cost of PSUs is subject to adjustment based upon the attainability of these performance targets. No settlement will occur with respect to the portion of the PSU award subject to each performance target for results below the applicable minimum threshold for that target. PSUs in excess of the target number granted will vest and be settled if performance exceeds the targeted performance goals. The Company currently intends to settle the PSUs in cash.

DSUs

DSUs entitle the holder to receive, either the underlying number of shares of the Company's Common Stock upon vesting of such units or, at the option of the Company, a cash payment equal to the value of the underlying shares. Once a DSU is vested, it is immediately settled. During the year ended December 31, 2020, DSUs were granted to directors and will vest 100% at such time the grantee ceases to be a member of the Board of Directors. The Company currently intends to settle the DSUs in cash.

Stock Options

Each stock option permits the holder to purchase one share of Common Stock at the stated exercise price. The exercise price equals the market price of a share of Common Stock at the time of grant. Stock options generally vest over three years. The term of stock options granted starting in May of 2013 is five years or three months after the grantee’s end of service to the Company, whichever occurs first.

For the years ended December 31, 2020 and 2019 , no stock options were exercised and no cash proceeds were received.

At December 31, 2020, the weighted average remaining contractual term of outstanding stock options was 3.2 years, (exercisable stock options - 1.9 years).

The fair value of each stock option award is estimated on the date of grant using the Black-Scholes option pricing model based on assumptions noted in the following table:

	Year Ended December 31,
	2020		2019
Dividend yield (per share)	Nil		Nil
Volatility	50% to 69%		48% to 54%
Weighted average volatility	52	%	51	%
Risk-free interest rate	0.3% to 1.7%		1.5% to 2.5%
Expected term	5 years		4-5 years

The weighted average grant date fair value for options granted in the year ended December 31, 2020 was $0.29 (2019 - $0.89; 2018 - $1.15). The weighted average grant date fair value for options vested in the year ended December 31, 2020 was $0.79 (2019 - $1.10). The total fair value of stock options vested during year ended December 31, 2020 was $1.9 million (2019 - $1.9 million).

Weighted Average Shares Outstanding

	Year Ended December 31,
	2020	2019
Weighted average number of common and exchangeable shares outstanding	366,981,556	376,495,306
Shares issuable pursuant to stock options	—	87,204
Shares assumed to be purchased from proceeds of stock options	—	(74,698)
Weighted average number of diluted common and exchange shares outstanding	366,981,556	376,507,812

For the year ended December 31, 2020, all options, on a weighted average basis, (2019 - 9,465,737 options) were excluded from the diluted (loss) earnings per share calculation as the options were anti-dilutive.

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Asset Retirement Obligation

12 Months Ended

Dec. 31, 2020

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligation

Asset Retirement Obligation

Changes in the carrying amounts of the asset retirement obligation associated with the Company’s oil and natural gas properties were as follows:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Balance, beginning of year	$	43,419	$	43,799
Liability incurred	909		7,034
Settlements	(201)		(846)
Accretion	3,464		3,436
Revisions in estimated liability	623		(10,004)
Balance, end of year	$	48,214	$	43,419

Revisions in estimated liabilities relate primarily to changes in estimates of asset retirement costs and include, but are not limited to, revisions of estimated inflation rates, changes in property lives and the expected timing of settling asset retirement obligations. At December 31, 2020, the fair value of assets that were legally restricted for purposes of settling asset retirement obligations was $3.8 million (December 31, 2019 - $2.8 million). These assets were accounted for as restricted cash and cash equivalents on the Company's balance sheet (Note 16).

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Revenue

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Revenue

Revenue

Most of the Company's revenue is generated from oil sales at prices which reflect the blended prices received upon shipment by the purchaser at defined sales points or are defined by contract relative to ICE Brent and adjusted for Vasconia or Castilla crude differentials, and quality and transportation discounts each month. For the year ended December 31, 2020, 100% (2019 - 100%) of the Company's revenue resulted from oil sales and quality and transportation discounts were 25% (2019 - 16%) of the ICE Brent price. During the year ended December 31, 2020, the Company's production was sold primarily to three major customers in Colombia (2019 - three) of which equaled 41%, 31% and 25% of total sales volumes respectively.

As at December 31, 2020, accounts receivable included $0.1 million of accrued sales revenue related to December 2020 production (as at December 31, 2019, $0.1 million related to December 2019 production).

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COVID-19 Related Costs

12 Months Ended

Dec. 31, 2020

Unusual or Infrequent Items, or Both [Abstract]

COVID-19 Related Costs

COVID-19 Related Costs

The COVID-19 pandemic resulted in extra operating and transportation costs related to COVID-19 health and safety preventative measures including incremental sanitation requirements and enhanced procedures for trucking barrels and crew changes in the field. Below is a break-down of the costs:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Operating expenses	$	2,482	$	—
Transportation costs	197		—
COVID-19 costs	$	2,679	$	—

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Taxes

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Taxes

Taxes

The income tax expense and recovery reported differs from the amount computed by applying the statutory rate to income (loss) before income taxes for the following reasons:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020			2019
Income (loss) before income taxes
United States	$	(19,065)		$	(27,984)
Foreign	(834,296)			123,959
	(853,361)			95,975
Statutory rate (1)	32		%	33		%
Income tax (recovery) expense expected	(273,076)			31,672
Impact of foreign taxes	26,668			9,387
Foreign currency translation	48,734			11,527
Goodwill Impairment	32,826			—
Stock-based compensation	666			430
Change in valuation allowance	75,241			3,429
Non-deductible third party royalty in Colombia	697			2,240
Other permanent differences	5,349			6,082
Non-deductible investment loss (gain) (PetroTal)	7,501			(7,482)
Total income tax (recovery) expense	$	(75,394)		$	57,285
Effective tax rate	9		%	60		%
Current income tax expense
Foreign	754			17,058
	754			17,058
Deferred income tax expense (recovery)
Foreign	(76,148)			40,227
Total income tax (recovery) expense	$	(75,394)		$	57,285

(1) The tax rate is the statutory rate in Colombia.

In general, it is the Company's practice and intention to reinvest the earnings of our non-U.S. subsidiaries in such subsidiaries' operations. As of December 31, 2020, the Company has not made a provision for U.S. or additional foreign withholding taxes on the investments in foreign subsidiaries that are indefinitely reinvested. Generally, such amounts become subject to taxation upon the remittance of dividends and under certain other circumstances.

In the fourth quarter of 2019, the Colombia government enacted a new tax reform to replace the 2018 tax reform, which was overturned by the Colombian Constitutional Court. This new tax reform maintains the same corporate tax rates that were approved by Congress in 2018. The enacted corporate tax rates are 32% for 2020, 31% for 2021 and 30% for 2022 and onwards. The tax rates applied to the calculation of deferred income taxes, before valuation allowances, have been adjusted to reflect these changes.

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
Deferred tax assets
Tax benefit of operating loss carryforwards	$	100,616	$	73,096
Tax basis in excess of book basis	37,698		544
Foreign tax credits and other accruals	86,664		76,720
Tax benefit of capital loss carryforwards	27,661		22,710
Deferred tax assets before valuation allowance	252,639		173,070
Valuation allowance	(195,321)		(129,067)
Deferred tax assets - long-term	57,318		44,003
Deferred tax liabilities	—		59,762
Net deferred tax assets (liabilities)	$	57,318	$	(15,759)

At December 31, 2020, the Company has not recognized the benefit of unused non-capital loss carryforwards of $46.0 million (2019 - $50.5 million) for federal purposes in the United States, which expire from 2029 to 2040.

At December 31, 2020, the Company has not recognized the benefit of unused non-capital loss carryforwards of $33.1 million (2019 - $31.5 million) for federal and provincial purposes in Canada, which expire from 2029 to 2039. The Company has not recognized the benefit of capital loss carry forwards of $240.5 million (2019 - $197.5 million) for federal and provincial purposes in Canada which can be carried forward indefinitely.

At December 31, 2020, the Company has recognized the benefit of unused non-capital loss carryforwards of $115.6 million (2019 - $140.5 million), out of a total of $252.0 million and tax credits of $1.0 million (2019 - $1.5 million), out of a total of $3.9 million, for federal purposes in Colombia. As a result of the 2016 Colombian Tax Reform, Colombian losses can be carryforward for a period of 12 years, and not indefinitely as under the previous tax regime. There is a grandfathering rule for losses incurred prior to 2017, which may continue to be carried forward indefinitely. Colombian losses of $33.7 million can be carried forward indefinitely and $218.3 million are entitled to a carryforward period of 12 years.

As at December 31, 2020 and 2019, Gran Tierra had no unrecognized tax benefits and related interest and penalties included in its deferred and current tax liabilities in the consolidated balance sheet. The Company does not anticipate any material changes with respect to unrecognized tax benefit within the next twelve months. The Company had no other significant interest or penalties related to taxes included in the consolidated statement of operations for the quarter ended December 31, 2020. The Company and its subsidiaries file income tax returns in the U.S. and certain other foreign jurisdictions. The Company is subject to income tax examinations for the tax years ended 2012 through 2020 in certain jurisdictions.

In the fourth quarter of 2019, $1.4 million of value added tax receivable was written-off mainly as a result of internal restructuring of our Colombian entities.

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Purchase Obligations, Firm Agreements and Leases

As at December 31, 2020, future minimum payments under non-cancelable agreements with remaining terms in excess of one year were as follows:

	Year ending December 31
(Thousands of U.S. Dollars)	Total		2021		2022		2023		2024		2025		Thereafter
Operating leases (1)	4,910		2,330		2,077		503		—		—		—
Finance leases (1)	4,725		3,197		1,444		57		27		—		—
Software and Telecommunication	900		300		300		300		—		—		—
	$	10,535	$	5,827	$	3,821	$	860	$	27	$	—	$	—

(1) Including maintenance and operating costs.

Gran Tierra has operating leases for office spaces and finance leases for water flood facilities and storage tanks and commitments relating to compressors, vehicles, equipment and housing.

Indemnities

Corporate indemnities have been provided by the Company to directors and officers for various items including, but not limited to, all costs to settle suits or actions due to their association with the Company and its subsidiaries and/or affiliates, subject to certain restrictions. The Company has purchased directors’ and officers’ liability insurance to mitigate the cost of any potential future suits or actions. The maximum amount of any potential future payment cannot be reasonably estimated. The Company may provide indemnifications in the normal course of business that are often standard contractual terms to counterparties in certain transactions such as purchase and sale agreements. The terms of these indemnifications will vary based upon the contract, the nature of which prevents the Company from making a reasonable estimate of the maximum potential amounts that may be required to be paid.

Letters of Credit

At December 31, 2020, the Company had provided letters of credit and other credit support totaling $100.6 million (December 31, 2019 - $120.6 million) as security relating to work commitment guarantees contained in exploration contracts in Colombia and Ecuador and other capital or operating requirements.

Contingencies

Gran Tierra has a number of lawsuits and claims pending including a dispute with the ANH relating to the calculation of HPR royalties. Although the outcome of these other lawsuits and disputes cannot be predicted with certainty, Gran Tierra believes the resolution of these matters would not have a material adverse effect on the Company’s consolidated financial position, results of operations or cash flows. Gran Tierra records costs as they are incurred or become probable and determinable.

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Financial Instruments, Fair Value Measurement, Credit Risk and Foreign Exchange Risk

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Financial Instruments, Fair Value Measurement, Credit Risk and Foreign Exchange Risk

Financial Instruments, Fair Value Measurement, Credit Risk and Foreign Exchange Risk

Financial Instruments

At December 31, 2020, the Company’s financial instruments recognized in the balance sheet consist of cash and cash equivalents, restricted cash and cash equivalents, accounts receivable, investment, derivatives, accounts payable and accrued liabilities, long-term debt, current and long-term equity compensation reward liability and other long-term liabilities.

Fair Value Measurement

The fair value of investment, derivatives and PSU liabilities is being remeasured at the estimated fair value at the end of each reporting period.

The fair value of the Company's investment in PetroTal was estimated to be $48.3 million and $94.7 million as at December 31, 2020 and 2019, respectively, based on the closing stock price of PetroTal of $0.20 ($0.25 CAD) and $0.38 ($0.50 CAD) per share as at December 31, 2020 and 2019, respectively.

The fair value of commodity price and foreign currency derivatives is estimated based on various factors, including quoted market prices in active markets and quotes from third parties. The Company also performs an internal valuation to ensure the reasonableness of third party quotes. In consideration of counterparty credit risk, the Company assessed the possibility of whether the counterparty to the derivative would default by failing to make any contractually required payments. Additionally, the Company considers that it is of substantial credit quality and has the financial resources and willingness to meet its potential repayment obligations associated with the derivative transactions.

The fair value of the PSU liability was estimated based on option pricing model using the inputs, such as quoted market prices in an active market, and PSU performance factor.

The fair value of investment, derivatives, PSU and DSU liabilities at December 31, 2020 and December 31, 2019 were as follows:

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
Investment	$	48,323	$	94,741
Derivative liability	$	12,050	$	775
PSU and DSU liability	4,760		7,859
	$	16,810	$	8,634

The following table presents gains or losses on financial instruments recognized in the accompanying consolidated statements of operations:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Commodity price derivative (gain) loss	$	(220)	$	3,642
Foreign currency derivative loss	3,155		27
Investment loss (gain)	46,883		(49,884)
Financial instruments loss	1,164		—
	$	50,982	$	(46,215)

These gains or losses are presented as financial instruments gains or losses in the consolidated statements of operations and cash flows.

GAAP establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. This hierarchy consists of three broad levels. Level 1 inputs consist of quoted prices (unadjusted) in active markets for identical assets and liabilities and have the highest priority. Level 2 and 3 inputs are based on significant other observable inputs and significant unobservable inputs, respectively, and have lower priorities. The Company uses appropriate valuation techniques based on the available inputs to measure the fair values of assets and liabilities.

Financial instruments not recorded at fair value at December 31, 2020 include the Senior Notes and the Revolving Credit Facility (Note 8). At December 31, 2020, the carrying amounts of the 6.25% Senior Notes and 7.75% Senior Notes were $292.3 million and $290.9 million, respectively, which represents the aggregate principal amount less unamortized debt issuance costs, and the fair values were $205.5 million and $206.9 million. The fair value of the Revolving Credit Facility approximates its carrying value. The fair value of the Senior Notes is determined based on quoted market prices considered Level 1 inputs. The fair value of the Revolving Credit Facility is estimated based on the amount the Company would have to pay a third party to assume the debt, including the credit spread for the difference between the issue rate and the period end market rate. The credit spread is the Company's default or repayment risk. The credit spread (premium or discount) is determined by comparing the debt to new issuances (secured or unsecured) and secondary trades of similar size and credit statistics for both public and private debt. The fair value of the Revolving Credit Facility was estimated using level 2 inputs.

The fair value of long-term restricted cash and cash equivalents and the revolving credit facility approximated their carrying value because interest rates are variable and reflective of market rates. The fair values of other financial instruments approximate their carrying amounts due to the short-term maturity of these instruments.

At December 31, 2020, the fair value of the investment and DSU liability was determined using Level 1 inputs and the fair value of derivatives and PSUs was determined using Level 2 inputs.

The Company’s non-recurring fair value measurements include asset retirement obligations. The fair value of an asset retirement obligation is measured by reference to the expected future cash outflows required to satisfy the retirement obligation discounted at the Company’s credit-adjusted risk-free interest rate. The significant level 3 inputs used to calculate such liabilities include estimates of costs to be incurred, the Company’s credit-adjusted risk-free interest rate, inflation rates and estimated dates of abandonment. Accretion expense is recognized over time as the discounted liabilities are accreted to their expected settlement value, while the asset retirement cost is amortized over the estimated productive life of the related assets.

Commodity Price Risk

The Company may at time utilize commodity price derivatives to manage the variability in cash flows associated with the forecasted sale of its oil production, reduce commodity price risk and provide a base level of cash flow in order to assure it can execute at least a portion of its capital spending. As at December 31, 2020, the Company had outstanding commodity price derivative positions as follows:

Period and Type of Instrument	Volume, bopd	Reference	Sold Put ($/bbl, Weighted Average)	Purchased Put ($/bbl, Weighted Average)	Sold Call ($/bbl, Weighted Average)	Premium ($/bbl, Weighted Average)
Three-way Collars: January 1, to June 30, 2021	14,000	ICE Brent	36.43	45.14	51.45	0.21
Collars: January 1, to June 30, 2021	1,000	ICE Brent	n/a	45.00	50.40	n/a
Swaptions: July 1, to December 31, 2021	3,000	ICE Brent	n/a	n/a	56.75	n/a

Subsequent to year end, the Company entered into the following commodity price derivative positions:

Period and Type of Instrument	Volume, bopd	Reference	Sold Put ($/bbl, Weighted Average)	Purchased Put ($/bbl, Weighted Average)	Sold Call ($/bbl, Weighted Average)	Premium ($/bbl, Weighted Average)
Three-way Collars: July 1, to December 31, 2021	4,000	ICE Brent	45.00	55.00	68.00	n/a

Foreign Exchange Risk

The Company is exposed to foreign exchange risk in relation to its Colombian operations predominantly in operating costs, general and administrative costs and transportation costs. To mitigate exposure to fluctuations in foreign exchange, the Company may enter into foreign exchange derivatives. As at December 31, 2020 the Company had no outstanding foreign currency derivative positions. Subsequent to year end, the Company entered into the following foreign currency derivative positions:

Period and Type of Instrument	Amount Hedged (Millions of COP)	U.S. Dollar Equivalent of Amount Hedged (Thousands of U.S. Dollars)(1)	Reference	Floor Price (COP, Weighted Average)	Cap Price (COP, Weighted Average)
Collars: March 1, to December 31, 2021	10,000	3,051	COP	3,500	3,630

(1) At December 31, 2020 foreign exchange rate.

Unrealized foreign exchange gains and losses primarily result from fluctuation of the U.S. dollar to the Colombian peso and Canadian dollar due to Gran Tierra’s current and deferred tax assets, taxes receivable and investment, which are monetary assets and liabilities mainly denominated in the local currencies. As a result, foreign exchange gains and losses must be calculated on conversion to the U.S. dollar functional currency. A strengthening in one Colombian peso against the U.S. dollar results in foreign exchange gain of approximately $12,000 on deferred tax asset balance and a foreign exchange gain of approximately $26,000 on taxes receivable. The strengthening of one Canadian cent against the U.S. dollar results in foreign exchange gain of $0.4 million on investment balance. This effect was calculated based on the Company's December 31, 2020, deferred tax asset and investment balances.

For the years ended December 31, 2020 and 2019, respectively, 100% of the Company's oil sales were generated in Colombia. In Colombia, the Company receives 100% of its revenues in U.S. dollars and the majority of its capital expenditures are in U.S. dollars or are based on U.S. dollar prices.

Credit Risk

Credit risk arises from the potential that the Company may incur a loss if counterparty to a financial instrument fails to meet its obligation in accordance with agreed terms. The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, restricted cash and accounts receivable. The carrying value of cash and cash equivalents, restricted cash and accounts receivable reflects management’s assessment of credit risk.

At December 31, 2020, cash and cash equivalents and restricted cash included balances in bank accounts, term deposits and certificates of deposit, placed with financial institutions with investment grade credit ratings.

Most of the Company’s accounts receivable relate to sales to customers in the oil and natural gas industry and are exposed to typical industry credit risks. The concentration of revenues in a single industry affects the Company’s overall exposure to credit risk because customers may be similarly affected by changes in economic and other conditions. The Company manages this credit risk by entering into sales contracts with only credit worthy entities and reviewing its exposure to individual entities on a regular basis and obtaining letters of credits from customers which amounted to $8.9 million as of December 31, 2020. For the years ended December 31, 2020 and 2019, respectively, the Company had three customers which were over 10% of sales.

To reduce the concentration of exposure to any individual counterparty, the Company utilizes a group of investment-grade rated financial institutions for its derivative transactions. The Company monitors counterparty creditworthiness on an ongoing basis; however, it cannot predict sudden changes in counterparties’ creditworthiness. In addition, even if such changes are not sudden, the Company may be limited in its ability to mitigate an increase in counterparty credit risk. Should one of these counterparties not perform, the Company may not realize the benefit of some of its derivative instruments.

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Supplemental Cash Flow Information

12 Months Ended

Dec. 31, 2020

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

Supplemental Cash Flow Information

The following table provides a reconciliation of cash, cash equivalents and restricted cash and cash equivalents with the Company's consolidated balance sheet that sum to the total of the same such amounts shown in the consolidated statements of cash flows:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Cash and cash equivalents	$	13,687	$	8,301
Restricted cash and cash equivalents - current	427		516
Restricted cash and cash equivalents - long-term (1)	3,409		2,258
	$	17,523	$	11,075

(1) The long-term portion of restricted cash is included in other long-term assets on the Company's balance sheet.

Net changes in assets and liabilities from operating activities were as follows:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Accounts receivable and other long-term assets	$	27,607	$	(5,680)
Derivatives	2,302		(638)
Inventory	(2,628)		(3,179)
Other prepaids	(279)		583
Accounts payable and accrued and other long-term liabilities	(47,194)		(1,367)
Prepaid tax and taxes receivable and payable	56,254		(83,593)
Net changes in assets and liabilities from operating activities	$	36,062	$	(93,874)

The following table provides additional supplemental cash flow disclosures:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Cash paid for income taxes	$	15,476	$	49,196
Cash paid for interest	$	50,209	$	37,767
Non-cash investing activities
Net liabilities related to property, plant and equipment, end of year	$	28,711	$	77,353

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Subsequent Events	12 Months Ended
	Dec. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsSubsequent to December 31, 2020, the Company sold 44% percent (109,006,250 common shares) of its interest in PetroTal for cash proceeds of $14.9 million resulting in a loss on sale of $5.1 million.

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Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Basis of consolidation

Basis of ConsolidationThese consolidated financial statements include the accounts of the Company and its controlled subsidiaries. All intercompany accounts and transactions have been eliminated.

Use of estimates

Use of Estimates The preparation of financial statements in conformity with 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 consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates made by management include: oil and natural gas reserves and related present value of future cash flows; depreciation, depletion, amortization (“DD&A”) and impairment; impairment assessments of goodwill; timing of transfers from oil and gas properties not subject to depletion to the depletable base; asset retirement obligations; determining the value of the consideration transferred and the net identifiable assets acquired and liabilities assumed in connection with business combinations and determining goodwill; assessments of the likely outcome of legal and other contingencies; income taxes; stock-based compensation; and determining the fair value of derivatives. Although management believes these estimates are reasonable, changes in facts and circumstances or discovery of new information may result in revised estimates and actual results may differ from these estimates.

Cash and cash equivalents

Cash and Cash EquivalentsThe Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents.

Restricted cash and cash equivalents

Restricted Cash and Cash Equivalents

Restricted cash and cash equivalents comprises cash and cash equivalents pledged to secure letters of credit and to settle asset retirement obligations. Letters of credit currently secured by cash relate to work commitment guarantees contained in exploration contracts. Restrictions will lapse when work obligations are satisfied pursuant to the exploration contract or an asset retirement obligation is settled. Cash and claims to cash that are restricted as to withdrawal or use for other than current operations or are designated for expenditure in the acquisition or construction of long-term assets are excluded from the current asset classification. The long-term portion of restricted cash and cash equivalents is included in other long-term assets on the Company's balance sheet.

Allowance for doubtful accounts

Allowance for Doubtful Accounts

At each reporting date, the Company assesses the expected lifetime credit losses on initial recognition of trade accounts receivable. Credit risk is assessed based on the number of days the receivable has been outstanding and the internal credit assessment of the customer. The expected loss rates are based on payment profiles over a period of 36 months prior to the period-end and the corresponding historical credit losses experienced within this period. Historical loss rates are adjusted to

reflect current and forward looking economic factors of the country where the Company sells oil that affect the ability of the customers to settle the receivables. Trade receivables are written off when there is no reasonable expectation of recovery.

Investment in PetroTal Corp

Investment in PetroTal Corp.

During December 2017, the Company acquired an investment in common shares of PetroTal Corp. ("PetroTal") in connection with the sale of its Peru business unit. At December 31, 2020, this investment represented approximately 30% of PetroTal's issued and outstanding common shares. The Company determined that it did not have a controlling financial interest in PetroTal, but could exert significant influence over PetroTal's operating and financial policies as a result of its ownership interest in PetroTal and the right to nominate two directors to PetroTal's board of directors. Accordingly, Gran Tierra accounted for its investment in the common shares of PetroTal as an equity method investment, but elected the fair value option for this investment to reflect the value that market participants would use to value the investment. The fair value of the investment in PetroTal's common shares is recorded as "Investment" on the Company's consolidated balance sheet, and the change in fair value is recorded in the consolidated statements of operations as financial instruments gains or losses. As at December 31, 2020, we held 246,100,000 common shares of PetroTal and subsequent to December 31, 2020 we disposed of 109,006,250 common shares resulting in 137,093,750 common shares held (17% of all total outstanding shares).

Derivatives

Derivatives

The Company records derivative instruments on its balance sheet at fair value as either an asset or liability with changes in fair value recognized in the consolidated statements of operations as financial instruments gains or losses. While the Company utilizes derivative instruments to manage the price risk attributable to its expected oil production and foreign exchange risk, it has elected not to designate its derivative instruments as accounting hedges under the accounting guidance.

Inventory

Inventory Inventory consists of oil in tanks and third party pipelines and supplies and is valued at the lower of cost and net realizable value. The cost of inventory is determined using the weighted average method. Oil inventories include expenditures incurred to produce, upgrade and transport the product to the storage facilities and include operating, depletion and depreciation expenses and cash royalties.

Income taxes

Income Taxes

Income taxes are recognized using the liability method, whereby deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the consolidated financial statements carrying amounts of existing assets and liabilities and their respective tax base, and operating loss and tax credit carry forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences and carryforwards are expected to be recovered or settled. Valuation allowances are provided if, after considering available evidence, it is not more likely than not that some or all of the deferred tax assets will be realized.

The tax benefit from an uncertain tax position is recognized when it is more likely than not, based on the technical merits of the position, that the position will be sustained on examination by the taxing authorities. Additionally, the amount of the tax benefit recognized is the largest amount of benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. In evaluating whether a tax position has met the more-likely-than-not recognition threshold, the Company presumes that the position will be examined by the appropriate taxing authority that has full knowledge of all relevant information. The Company recognizes potential penalties and interest related to unrecognized tax benefits as a component of income tax expense.

Oil and gas properties

Oil and Gas Properties

The Company uses the full cost method of accounting for its investment in oil and natural gas properties as defined by the Securities and Exchange Commission (“SEC”). Under this method, the Company capitalizes all acquisition, exploration and development costs incurred for the purpose of finding oil and natural gas reserves, including salaries, benefits and other internal costs directly attributable to these activities. Costs associated with production and general corporate activities; however, are expensed as incurred. Separate cost centers are maintained for each country in which the Company incurs costs.

The Company computes depletion of oil and natural gas properties on a quarterly basis using the unit-of-production method based upon production and estimates of proved reserve quantities. Future development costs related to properties with proved reserves are also included in the amortization base for computation of depletion. The costs of unproved properties are excluded from the amortization base until the properties are evaluated. The cost of exploratory dry wells is transferred to proved

properties, and thus is subject to amortization, immediately upon determination that a well is dry in those countries where proved reserves exist.

The Company performs a ceiling test calculation each quarter in accordance with SEC Regulation S-X Rule 4-10. In performing its quarterly ceiling test, the Company limits, on a country-by-country basis, the capitalized costs of proved oil and natural gas properties, net of accumulated depletion and deferred income taxes, to the estimated future net cash flows from proved oil and natural gas reserves discounted at 10%, net of related tax effects, plus the lower of cost or fair value of unproved properties included in the costs being amortized. If such capitalized costs exceed the ceiling, the Company will record a write-down to the extent of such excess as a non-cash charge to net income or loss. Any such write-down will reduce earnings in the period of occurrence and results in a lower DD&A rate in future periods. A write-down may not be reversed in future periods even though higher oil and natural gas prices may subsequently increase the ceiling.

The Company calculates future net cash flows by applying the unweighted average of prices in effect on the first day of the month for the preceding 12-month period, adjusted for location and quality differentials. Such prices are utilized except where different prices are fixed and determinable from applicable contracts for the remaining term of those contracts.

Unproved properties are not depleted pending the determination of the existence of proved reserves. Costs are transferred into the depletable base on an ongoing basis as the properties are evaluated and proved reserves are established or impairment is determined. Unproved properties are evaluated quarterly to ascertain whether impairment has occurred. This evaluation considers, among other factors, seismic data, requirements to relinquish acreage, drilling results and activity, remaining time in the commitment period, remaining capital plans, and political, economic, and market conditions. During any period in which factors indicate an impairment, the cumulative costs incurred to date for such property are transferred to the full cost pool and are then subject to depletion. For countries where a reserve base has not yet been established, the impairment is charged to earnings.

In exploration areas, related seismic costs are capitalized in unproved property and evaluated as part of the total capitalized costs associated with a property. Seismic costs related to development projects are recorded in proved properties and therefore subject to depletion as incurred.

Gains and losses on the sale or other disposition of oil and natural gas properties are not recognized, unless the gain or loss would significantly alter the relationship between capitalized costs and proved reserves of oil and natural gas attributable to a country.

Asset retirement obligation

Asset Retirement ObligationThe Company records an estimated liability for future costs associated with the abandonment of its oil and gas properties including the costs of reclamation of drilling sites. The Company records the fair value of a liability for a legal obligation to retire an asset in the period in which the liability is incurred with an offsetting increase to the related oil and gas properties. The fair value of an asset retirement obligation is measured by reference to the expected future cash outflows required to satisfy the retirement obligation discounted at the Company’s credit-adjusted risk-free interest rate. Accretion expense is recognized over time as the discounted liabilities are accreted to their expected settlement value, while the asset retirement cost is amortized over the estimated productive life of the related assets. The accretion of the asset retirement obligation and amortization of the asset retirement cost are included in DD&A. If estimated future costs of an asset retirement obligation change, an adjustment is recorded to both the asset retirement obligation and oil and gas properties. Revisions to the estimated asset retirement obligation can result from changes in retirement cost estimates, revisions to estimated inflation rates and changes in the estimated timing of abandonment.

Other capital assets

Other Capital AssetsOther capital assets, including additions and replacements, are recorded at cost upon acquisition and include furniture, fixtures and leasehold improvement, computer equipment, automobiles and right-of-use assets for operating and finance leases. Depreciation for furniture and fixtures, computer equipment and automobiles is provided using the straight-line method over the useful life of the asset. Leasehold improvements and right-of-use assets for operating and finance leases are depreciated on a straight-line basis over the shorter of the estimated useful life and the term of the related lease. The cost of repairs and maintenance is charged to expense as incurred.

Goodwill

Goodwill Goodwill represents the excess of the aggregate of the consideration transferred over the net identifiable assets acquired and liabilities assumed. The Company assesses qualitative factors annually, or more frequently if necessary, to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount and whether it is necessary to perform the goodwill impairment test. The impairment test requires allocating goodwill and certain other assets and liabilities to assigned reporting units. The fair value of each reporting unit is estimated and compared with its net book value. An impairment loss is recognized if the estimated fair value of the reporting unit is less than its carrying amount, not exceeding the carrying amount of goodwill allocated to that reporting unit. Because quoted market prices are not available for the Company’s reporting unit, the fair value of the reporting unit is estimated based upon estimated future cash flows of the reporting unit.

Leases

Leases

At inception of a contract, the Company assesses whether a contract is, or contains, a lease. A contract is, or contains, a lease if the contract conveys the right to control the use of an identified asset for a period of time in exchange for consideration. At inception of a contract that contains a lease component, the Company allocates the consideration in the contract to each lease and non-lease component on the basis of their relative stand-alone prices. The Company recognizes a right-of-use asset and a lease liability at the lease commencement date. The right-of-use asset is initially measured at cost, and subsequently at cost less any accumulated depreciation and impairment losses, and adjusted for certain remeasurements of the lease liability.

The lease liability is initially measured at the present value of the lease payments that are not paid at the commencement date, discounted using the interest rate implicit in the lease or, if that rate cannot be readily determined, the Company's incremental borrowing rate. Generally, the Company uses its incremental borrowing rate as the discount rate. The lease liability is subsequently increased by the interest cost on the lease liability and decreased by lease payments made. It is remeasured when there is a change in future lease payments arising from a change in an index or rate, a change in the estimate of the amount expected to be payable under a residual value guarantee, or as appropriate, changes in the assessment of whether a purchase or extension option is reasonably certain to be exercised or a termination option is reasonably certain not to be exercised.

The Company has applied judgment to determine the lease term for contracts which include renewal or termination options. The assessment of whether the Company is reasonably certain to exercise such options impacts the lease term, which significantly affects the amount of lease liabilities and right-of-use assets recognized.

All leases identified as part of the transition on January 1, 2019 relate to office leases. The transition resulted in the recognition of a right-of-use asset presented in other capital assets of $3.8 million at January 1, 2019, the recognition of lease liabilities of $4.2 million and a $0.4 million impact on retained earnings. When measuring the lease liabilities, the Company's incremental borrowing rate was used. At January 1, 2019 the rates applied ranged between 5.6% and 9.1%.

Revenue from Contracts with Customers

Revenue from Contracts with Customers

The Company's revenue relates to oil sales in Colombia. The Company recognizes revenue when it transfers control of the product to a customer. This generally occurs at the time the customer obtains legal title to the product and when it is physically transferred to the delivery point agreed with the customer. Payment terms are generally within three business days following delivery of an invoice to the customer. Revenue is recognized based on the consideration specified in contracts with customers. Revenue represents the Company's share and is recorded net of royalty payments to governments and other mineral interest owners.

The Company evaluates its arrangement with third parties and partners to determine if the Company acts as a principal or an agent. In making this evaluation, management considers if the Company obtains control of the product delivered, which is indicated by the Company having the primary responsibility for the delivery of the product, having ability to establish prices or having inventory risk. If the Company acts in the capacity of an agent rather than as a principal in transaction, then the revenue is recognized on a net-basis, only reflecting the fee realized by the Company from the transaction.

Tariffs, tolls and fees charged to other entities for use of pipelines owned by the Company are evaluated by management to determine if these originate from contracts with customers or from incidental arrangements. When determining if the Company acted as a principal or as an agent in transactions, management determines if the Company obtains control of the product. As part of this assessment, management considers criteria for revenue recognition set out in ASC 606.

Stock-based compensation

Stock-based Compensation

The Company records stock-based compensation expense in its consolidated financial statements measured at the fair value of the awards that are ultimately expected to vest. Fair values are determined using pricing models such as the Black-Scholes-Merton or Monte Carlo simulation stock option-pricing models and/or observable share prices. For equity-settled stock-based compensation awards, fair values are determined at the grant date and the expense, net of estimated forfeitures, is recognized using the accelerated method over the requisite service period. An adjustment is made to compensation expense for any difference between the estimated forfeitures and the actual forfeitures. For cash-settled stock-based compensation awards, fair values are determined at each reporting date and periodic changes are recognized as compensation costs, with a corresponding change to liabilities.

The Company uses historical data to estimate the expected term used in the Black-Scholes option pricing model, option exercises and employee departure behavior. Expected volatilities used in the fair value estimate are based on the historical volatility of the Company’s shares. The risk-free rate for periods within the expected term of the stock options is based on the U.S. Treasury yield curve in effect at the time of grant.

Stock-based compensation expense is capitalized as part of oil and natural gas properties or expensed as part of general and administrative (“G&A”) or operating expenses, as appropriate.

Foreign currency translation

Foreign Currency Translation

The functional currency of the Company, including its subsidiaries, is the United States dollar. Monetary items are translated into the reporting currency at the exchange rate in effect at the balance sheet date and non-monetary items are translated at historical exchange rates. Revenue and expense items are translated in a manner that produces substantially the same reporting currency amounts that would have resulted had the underlying transactions been translated on the dates they occurred.

DD&A expense on assets is translated at the historical exchange rates similar to the assets to which they relate. Gains and losses resulting from foreign currency transactions, which are transactions denominated in a currency other than the entity’s functional currency, are recognized in net income or loss.

Earnings (loss) per share

Earnings (Loss) per Share

Basic earnings (loss) per share is calculated by dividing net income or loss attributable to common shareholders by the weighted average number of shares of Common Stock and exchangeable shares issued and outstanding during each period. Diluted net income or loss per share is calculated by adjusting the weighted average number of shares of Common Stock and exchangeable shares outstanding for the dilutive effect, if any, of share equivalents. The Company uses the treasury stock method to determine the dilutive effect. This method assumes that all Common Stock equivalents have been exercised at the beginning of the period (or at the time of issuance, if later), and that the funds obtained thereby were used to purchase shares of Common Stock of the Company at the volume weighted average trading price of shares of Common Stock during the period.

Recently Adopted Accounting Pronouncements

Recently Adopted Accounting Pronouncements

Financial Instruments - Credit Losses (ASC 326)

In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses". This ASU replaces the incurred loss impairment methodology with a methodology that reflects expected credit losses and requires a broader range of reasonable and supportable information to support credit loss estimates. In December 2019, the FASB issued ASU 2019-10, "Financial Instruments - Credit Losses, Derivatives and Hedging and Leases", which is codification improvement of ASU 2016-13. The Company adopted this ASU on January 1, 2020, the adoption of which had no material impact on the Company's consolidated balance sheet, results of operations or cash flows.

Risks and Measurement Uncertainty

Risks and Measurement Uncertainty

In March 2020, the outbreak of the COVID-19 virus, which was declared a pandemic by the World Health Organization, has spread across the globe and impacted worldwide economic activity. In addition, global commodity prices declined significantly due to disputes between major oil producing countries combined with the impact of the COVID-19 pandemic and associated reductions in global demand for oil. Governments worldwide, including those in Colombia and Ecuador, the countries where the Company operates, enacted emergency measures to combat the spread of the virus. These measures, which include the implementation of travel bans, self-imposed quarantine periods and physical distancing, caused material disruption to

businesses globally resulting in an economic slowdown. Governments and central banks have reacted with significant monetary and fiscal interventions designed to stabilize economic conditions; however, the success of these interventions is not currently determinable. The current challenging economic climate is having and may continue to have significant adverse impacts on the Company including, but not exclusively:

•material declines in revenue and cash flows as a result of the decline in commodity prices;

•declines in revenue and operating activities due to reduced capital programs and the shut-in of production;

•impairment charges (see Note 6);

•inability to comply with covenants and restrictions in debt agreements;

•inability to access financing sources;

•increased risk of non-performance by the Company’s customers and suppliers;

•interruptions in operations as the Company adjusts personnel to the dynamic environment; and

•inability to operate or delay in operations as a result COVID-19 restrictions in the countries in which the Company operates.

The unprecedented decline in oil prices has materially reduced the Company’s forecasted EBITDAX and the estimated value of its oil reserves. Based on current forecasted Brent pricing and production levels, which can change materially in very short time frames, the Company is forecasted to be in compliance with the amended financial covenants contained in the Company's Senior Secured Credit Facility (the "revolving credit facility") for at least the next year from the date of these financial statements. The amount available under the Company’s senior secured credit facility is based on the lenders determination of the borrowing base. The borrowing base is determined, by the lenders, based on the Company’s reserves and commodity prices. The next renewal of the borrowing base is scheduled for May 2021 and there is risk that the borrowing base may be reduced by the lenders. In addition, the Company’s ability to borrow under the credit facility may be limited by the terms of the indentures for the 6.25% Senior Notes and 7.75% Senior Notes.

The risk of non-compliance with the covenants in the lending agreements and the risk associated with maintaining the borrowing base is heightened in the current period of volatility coupled with the unprecedented disruption caused by the COVID-19 pandemic. Management currently expects that the Company will continue to meet the terms of the credit facility or obtain further amendments or waivers if and when required. The Company also expects to be able to maintain the borrowing base at a level in excess of the amount borrowed. However, there can be no assurances that the Company’s liquidity can be maintained at or above current levels during this period of volatility and global economic uncertainty.

The situation is dynamic and the ultimate duration and magnitude of the impact on the economy and the financial effect on the Company is not known at this time. Estimates and judgments made by management in the preparation of the financial statements are increasingly difficult and subject to a higher degree of measurement uncertainty during this volatile period. In the near term, matters in these financial statements that are most subject to be impacted by this volatile period are the Company's assessment of liquidity and access to capital, the carrying value of long-lived assets and the valuation of the deferred tax assets.

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Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Schedule of Accounts Receivable

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
Trade	$	3,799	$	24,890
Other	4,245		11,401
Total Accounts Receivable	$	8,044	$	36,291

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Taxes Receivable (Tables)

12 Months Ended

Dec. 31, 2020

Tax Receivable Agreement [Abstract]

Schedule of Taxes Receivable Components

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Current
VAT Receivable	$	35,977	$	92,777
Income Tax Receivable	13,985		43,061
	$	49,962	$	135,838
Long-Term
VAT Receivable	$	28,485	$	25,869
Income Tax Receivable	14,150		—
	$	42,635	$	25,869
Total Taxes Receivable	$	92,597	$	161,707

The following table shows the movement of VAT and income tax receivables for the past two years:

Schedule of Taxes Receivable Roll Forward

(Thousands of U.S. Dollars)	VAT Receivable		Income Tax Receivable		Total Taxes Receivable
Balance, December 31, 2018	$	72,497	$	1,613	$	74,110
Collected through sales contracts	(18,197)		—		(18,197)
Taxes paid	65,114		58,494		123,608
Current tax expense	—		(17,058)		(17,058)
Foreign exchange loss	(768)		12		(756)
Balance, December 31, 2019	$	118,646	$	43,061	$	161,707
Collected through direct government refunds	(40,884)		(26,471)		(67,355)
Collected through sales contracts	(46,326)		—		(46,326)
Taxes paid	43,719		14,648		58,367
Current tax expense	—		(754)		(754)
Foreign exchange loss	(10,693)		(2,349)		(13,042)
Balance, December 31, 2020	$	64,462	$	28,135	$	92,597

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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
Oil and natural gas properties
Proved	$	4,106,768	$	3,850,565
Unproved	161,763		310,809
	4,268,531		4,161,374
Other (1)	32,135		30,255
	4,300,666		4,191,629
Accumulated depletion, depreciation and impairment	(3,336,184)		(2,614,236)
	$	964,482	$	1,577,393

(1) The "other" category includes $11.4 million right-of-use assets for operating and finance leases which had a net book value of $4.4 million as at December 31, 2020 (December 31, 2019 - $9.7 million which had a net book value of $5.7 million).

Schedule of Asset Acquisition

(Thousands of U.S. Dollars)	2019
Cost of Asset Acquisition:
Cash	$	79,100
Promissory note	1,500
	$	80,600
Allocation of Consideration Paid:
Oil and gas properties
Proved	$	52,530
Unproved	44,768
	97,298
Net working capital (including cash acquired of $5.3 million)	(16,698)
	$	80,600

Summary of Oil and Natural Gas Properties

The following is a summary of Gran Tierra’s oil and natural gas properties not subject to depletion as at December 31, 2020:

	Costs Incurred in
(Thousands of U.S. Dollars)	2020		2019		Prior to 2019		Total
Acquisition costs - Colombia	$	—	$	5,582	$	32,558	$	38,140
Exploration costs - Colombia	4,652		57,328		56,429		118,409
Exploration costs - Ecuador	2,006		3,208		—		5,214
	$	6,658	$	66,118	$	88,987	$	161,763

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Impairment (Tables)

12 Months Ended

Dec. 31, 2020

Impairment Disclosure [Abstract]

Schedule of Asset Impairment

Asset impairment for the years ended December 31, 2020 and 2019, was as follows:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Impairment of oil and gas properties	$	560,344	$	—
Impairment of inventory	4,151		—
	$	564,495	$	—

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Accounts Payable and Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Accrued Liabilities

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Trade	$	70,450	$	151,747
Royalties	1,570		5,758
Employee compensation	1,701		6,861
Other	27,063		31,147
	$	100,784	$	195,513

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Debt and Debt Issuance Costs (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Schedule of Debt

The Company's debt at December 31, 2020 and 2019, was as follows:

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
6.25% Senior Notes	$	300,000	$	300,000
7.75% Senior Notes	300,000		300,000
Revolving credit facility	190,000		118,000
Unamortized debt issuance costs	(18,124)		(21,081)
Long-term lease obligation (1)	2,894		3,540
Long-term debt	$	774,770	$	700,459

(1) The current portion of the lease obligation has been included in accounts payable and accrued liabilities on the Company's balance sheet and totaled $3.3 million as at December 31, 2020 (December 31, 2019 - $3.3 million).

Schedule of Total Interest Expense Recognized

The following table presents total interest expense recognized in the accompanying consolidated statements of operations:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Contractual interest and other financing expenses	$	50,515	$	39,892
Amortization of debt issuance costs	3,625		3,376
	$	54,140	$	43,268

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Share Capital (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Schedule of Common Stock

	Shares of Common Stock
Balance, December 31, 2018	387,079,027
Shares repurchased and canceled	(20,097,471)
Balance, December 31, 2019 and 2020	366,981,556

Schedule of Information About PSU, DSU, RSU and Stock Option Activity

The following table provides information about PSU, DSU and stock option activity for the year ended December 31, 2020:

	PSUs	DSUs	Stock Options
	Number of Outstanding Share Units	Number of Outstanding Share Units	Number of Outstanding Stock Options	Weighted Average Exercise Price /Stock Option ($)
Balance, December 31, 2019	11,371,367	1,251,994	10,612,872	$	2.78
Granted	15,897,575	2,815,903	8,893,140	0.70
Exercised	(2,366,351)	—	—	—
Forfeited	(1,629,187)	—	(1,038,093)	2.04
Expired	—	—	(3,022,970)	3.42
Balance, December 31, 2020	23,273,404	4,067,897	15,444,949	$	1.50
Vested and exercisable, at December 31, 2020			5,443,796	$	2.39
Vested, or expected to vest, at December 31, 2020 through the life of the options			14,938,829	$	1.53

Schedule of Assumptions Using the Black-Scholes Option Pricing Model

The fair value of each stock option award is estimated on the date of grant using the Black-Scholes option pricing model based on assumptions noted in the following table:

	Year Ended December 31,
	2020		2019
Dividend yield (per share)	Nil		Nil
Volatility	50% to 69%		48% to 54%
Weighted average volatility	52	%	51	%
Risk-free interest rate	0.3% to 1.7%		1.5% to 2.5%
Expected term	5 years		4-5 years

Schedule of Weighted Average Number of Shares

Weighted Average Shares Outstanding

	Year Ended December 31,
	2020	2019
Weighted average number of common and exchangeable shares outstanding	366,981,556	376,495,306
Shares issuable pursuant to stock options	—	87,204
Shares assumed to be purchased from proceeds of stock options	—	(74,698)
Weighted average number of diluted common and exchange shares outstanding	366,981,556	376,507,812

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Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2020

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Asset Retirement Obligation

Changes in the carrying amounts of the asset retirement obligation associated with the Company’s oil and natural gas properties were as follows:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Balance, beginning of year	$	43,419	$	43,799
Liability incurred	909		7,034
Settlements	(201)		(846)
Accretion	3,464		3,436
Revisions in estimated liability	623		(10,004)
Balance, end of year	$	48,214	$	43,419

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COVID-19 Related Costs (Tables)

12 Months Ended

Dec. 31, 2020

Unusual or Infrequent Items, or Both [Abstract]

Schedule Cost Incurred due to Catastrophic Events

The COVID-19 pandemic resulted in extra operating and transportation costs related to COVID-19 health and safety preventative measures including incremental sanitation requirements and enhanced procedures for trucking barrels and crew changes in the field. Below is a break-down of the costs:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Operating expenses	$	2,482	$	—
Transportation costs	197		—
COVID-19 costs	$	2,679	$	—

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Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Schedule of Income Tax Expense Reported

The income tax expense and recovery reported differs from the amount computed by applying the statutory rate to income (loss) before income taxes for the following reasons:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020			2019
Income (loss) before income taxes
United States	$	(19,065)		$	(27,984)
Foreign	(834,296)			123,959
	(853,361)			95,975
Statutory rate (1)	32		%	33		%
Income tax (recovery) expense expected	(273,076)			31,672
Impact of foreign taxes	26,668			9,387
Foreign currency translation	48,734			11,527
Goodwill Impairment	32,826			—
Stock-based compensation	666			430
Change in valuation allowance	75,241			3,429
Non-deductible third party royalty in Colombia	697			2,240
Other permanent differences	5,349			6,082
Non-deductible investment loss (gain) (PetroTal)	7,501			(7,482)
Total income tax (recovery) expense	$	(75,394)		$	57,285
Effective tax rate	9		%	60		%
Current income tax expense
Foreign	754			17,058
	754			17,058
Deferred income tax expense (recovery)
Foreign	(76,148)			40,227
Total income tax (recovery) expense	$	(75,394)		$	57,285

(1) The tax rate is the statutory rate in Colombia.

Schedule of Deferred Tax Assets and Liabilities

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
Deferred tax assets
Tax benefit of operating loss carryforwards	$	100,616	$	73,096
Tax basis in excess of book basis	37,698		544
Foreign tax credits and other accruals	86,664		76,720
Tax benefit of capital loss carryforwards	27,661		22,710
Deferred tax assets before valuation allowance	252,639		173,070
Valuation allowance	(195,321)		(129,067)
Deferred tax assets - long-term	57,318		44,003
Deferred tax liabilities	—		59,762
Net deferred tax assets (liabilities)	$	57,318	$	(15,759)

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Payments Under Non-Cancelable Agreements

As at December 31, 2020, future minimum payments under non-cancelable agreements with remaining terms in excess of one year were as follows:

	Year ending December 31
(Thousands of U.S. Dollars)	Total		2021		2022		2023		2024		2025		Thereafter
Operating leases (1)	4,910		2,330		2,077		503		—		—		—
Finance leases (1)	4,725		3,197		1,444		57		27		—		—
Software and Telecommunication	900		300		300		300		—		—		—
	$	10,535	$	5,827	$	3,821	$	860	$	27	$	—	$	—

(1) Including maintenance and operating costs.

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Financial Instruments, Fair Value Measurement, Credit Risk and Foreign Exchange Risk (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Trading Securities, Derivative Assets, and RSU and PSU Liabilities

The fair value of investment, derivatives, PSU and DSU liabilities at December 31, 2020 and December 31, 2019 were as follows:

	As at December 31,
(Thousands of U.S. Dollars)	2020		2019
Investment	$	48,323	$	94,741
Derivative liability	$	12,050	$	775
PSU and DSU liability	4,760		7,859
	$	16,810	$	8,634

Schedule of Losses or Gains on Financial Instruments Recognized

The following table presents gains or losses on financial instruments recognized in the accompanying consolidated statements of operations:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Commodity price derivative (gain) loss	$	(220)	$	3,642
Foreign currency derivative loss	3,155		27
Investment loss (gain)	46,883		(49,884)
Financial instruments loss	1,164		—
	$	50,982	$	(46,215)

Schedule of Price Risk Derivatives

As at December 31, 2020, the Company had outstanding commodity price derivative positions as follows:

Period and Type of Instrument	Volume, bopd	Reference	Sold Put ($/bbl, Weighted Average)	Purchased Put ($/bbl, Weighted Average)	Sold Call ($/bbl, Weighted Average)	Premium ($/bbl, Weighted Average)
Three-way Collars: January 1, to June 30, 2021	14,000	ICE Brent	36.43	45.14	51.45	0.21
Collars: January 1, to June 30, 2021	1,000	ICE Brent	n/a	45.00	50.40	n/a
Swaptions: July 1, to December 31, 2021	3,000	ICE Brent	n/a	n/a	56.75	n/a

Subsequent to year end, the Company entered into the following commodity price derivative positions:

Period and Type of Instrument	Volume, bopd	Reference	Sold Put ($/bbl, Weighted Average)	Purchased Put ($/bbl, Weighted Average)	Sold Call ($/bbl, Weighted Average)	Premium ($/bbl, Weighted Average)
Three-way Collars: July 1, to December 31, 2021	4,000	ICE Brent	45.00	55.00	68.00	n/a

Schedule of Derivative Instruments

As at December 31, 2020 the Company had no outstanding foreign currency derivative positions. Subsequent to year end, the Company entered into the following foreign currency derivative positions:

Period and Type of Instrument	Amount Hedged (Millions of COP)	U.S. Dollar Equivalent of Amount Hedged (Thousands of U.S. Dollars)(1)	Reference	Floor Price (COP, Weighted Average)	Cap Price (COP, Weighted Average)
Collars: March 1, to December 31, 2021	10,000	3,051	COP	3,500	3,630

(1) At December 31, 2020 foreign exchange rate.

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Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2020

Supplemental Cash Flow Elements [Abstract]

Summary of Restrictions on Cash and Cash Equivalents

The following table provides a reconciliation of cash, cash equivalents and restricted cash and cash equivalents with the Company's consolidated balance sheet that sum to the total of the same such amounts shown in the consolidated statements of cash flows:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Cash and cash equivalents	$	13,687	$	8,301
Restricted cash and cash equivalents - current	427		516
Restricted cash and cash equivalents - long-term (1)	3,409		2,258
	$	17,523	$	11,075

(1) The long-term portion of restricted cash is included in other long-term assets on the Company's balance sheet.

Schedule of Net Changes in Assets and Liabilities

Net changes in assets and liabilities from operating activities were as follows:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Accounts receivable and other long-term assets	$	27,607	$	(5,680)
Derivatives	2,302		(638)
Inventory	(2,628)		(3,179)
Other prepaids	(279)		583
Accounts payable and accrued and other long-term liabilities	(47,194)		(1,367)
Prepaid tax and taxes receivable and payable	56,254		(83,593)
Net changes in assets and liabilities from operating activities	$	36,062	$	(93,874)

Schedule of Additional Supplemental Cash Flow Disclosures

The following table provides additional supplemental cash flow disclosures:

	Year Ended December 31,
(Thousands of U.S. Dollars)	2020		2019
Cash paid for income taxes	$	15,476	$	49,196
Cash paid for interest	$	50,209	$	37,767
Non-cash investing activities
Net liabilities related to property, plant and equipment, end of year	$	28,711	$	77,353

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Significant Accounting Policies - Investment in PetroTal Corp (Details)	2 Months Ended	12 Months Ended
	Feb. 24, 2021 shares	Dec. 31, 2020 director shares
Schedule of Equity Method Investments [Line Items]
Number of directors eligible to be nominated by the company | director		2
Petro Tal
Schedule of Equity Method Investments [Line Items]
Ownership interest divested (as a percent)		30.00%
Number of shares held (in shares)		246,100,000
Petro Tal | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Ownership interest divested (as a percent)	17.00%
Number of shares held (in shares)	137,093,750
Number of shares disposed (in shares)	109,006,250

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Significant Accounting Policies - Income Taxes - Intra-Entity Transfers of Assets Other than Inventory (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense (benefit)	$ (75,394)	$ 57,285
Deferred tax asset	$ 57,318

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Significant Accounting Policies - Leases (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Retained earnings	$ (1,038,254)	$ (260,287)
Cumulative Effect, Period of Adoption, Adjustment
Lessee, Lease, Description [Line Items]
Operating lease, right-of-use asset			$ 3,800
Operating lease, liability			4,200
Retained earnings			$ 400
Incremental borrowing rate used for lease liabilities, lower range			5.60%
Incremental borrowing rate used for lease liabilities, lower range			9.10%

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Significant Accounting Policies - Risk (Narrative) (Details) - Senior Notes	May 20, 2019	Feb. 15, 2018
6.25% Senior Notes
Debt Instrument [Line Items]
Stated interest rate		6.25%
7.75% Senior Notes due 2027
Debt Instrument [Line Items]
Stated interest rate	7.75%

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Accounts Receivable - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 8,044	$ 36,291
Trade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	3,799	24,890
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 4,245	$ 11,401

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Taxes Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Current
VAT Receivable			$ 35,977	$ 92,777
Income Tax Receivable			13,985	43,061
Tax Receivable			49,962	135,838
Long-Term
VAT Receivable			28,485	25,869
Income Tax Receivable			14,150	0
Tax Receivable			42,635	25,869
Total Taxes Receivable	$ 161,707	$ 161,707	$ 92,597	$ 161,707
VAT Receivable
Beginning balance	118,646	72,497
Collected through direct government refunds	(40,884)
Collected through sales contracts	(46,326)	(18,197)
Taxes paid	43,719	65,114
Current tax expense	0	0
Foreign exchange loss	(10,693)	(768)
Ending Balance	64,462	118,646
Income Tax Receivable
Beginning balance	43,061	1,613
Collected through direct government refunds	(26,471)
Collected through sales contracts	0	0
Taxes paid	14,648	58,494
Current tax expense	(754)	(17,058)
Foreign exchange loss	(2,349)	12
Ending balance	28,135	43,061
Total Taxes Receivable
Beginning balance	161,707	74,110
Collected through direct government refunds	(67,355)
Collected through sales contracts	(46,326)	(18,197)
Taxes paid	58,367	123,608
Current tax expense	(754)	(17,058)
Foreign exchange loss	(13,042)	(756)
Ending balance	$ 92,597	$ 161,707

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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 4,300,666	$ 4,191,629
Accumulated depletion, depreciation and impairment	(3,336,184)	(2,614,236)
Property, plant, and equipment, net	964,482	1,577,393
Right-of-use asset	11,400	9,700
Operating lease and finance lease, net	4,400	5,700
Oil and natural gas properties
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	4,268,531	4,161,374
Proved
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	4,106,768	3,850,565
Unproved
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	161,763	310,809
Other
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 32,135	$ 30,255

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Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 20, 2019	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Depletion and depreciation expense		$ 160,800	$ 220,800
Payments to acquire assets	$ 79,100
Consideration transferred, liabilities incurred	$ 1,500
Costs not expected to be subject to depletion (as a percent)		100.00%
Period until transferred to depletable base		5 years
Suroriente block
Property, Plant and Equipment [Line Items]
Percentage of working interests acquired	36.20%
Llanos-5 Block
Property, Plant and Equipment [Line Items]
Percentage of working interests acquired	100.00%

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Property, Plant and Equipment - Cost of Assets Acquired (Details) $ in Thousands	Feb. 20, 2019 USD ($)
Cost of asset acquisition:
Cash	$ 79,100
Promissory note	1,500
Consideration transferred	80,600
Oil and gas properties	97,298
Net working capital (including cash acquired of $5.3 million)	(16,698)
Net assets acquired	80,600
Cash acquired	5,300
Proved
Cost of asset acquisition:
Oil and gas properties	52,530
Unproved
Cost of asset acquisition:
Oil and gas properties	$ 44,768

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Property, Plant and Equipment - Summary of Oil and Natural Gas Properties (Details) - USD ($) $ in Thousands	12 Months Ended			36 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Properties not subject to depletion	$ 6,658	$ 66,118	$ 88,987	$ 161,763
Reportable Segments | Colombia
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Acquisition costs	0	5,582	32,558	38,140
Exploration costs	4,652	57,328	56,429	118,409
Non-Segment | Ecuador
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Exploration costs	$ 2,006	$ 3,208	$ 0	$ 5,214

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Impairment - Asset Impairment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Impairment Disclosure [Abstract]
Impairment of oil and gas properties	$ 560,344,000	$ 0
Impairment of inventory	4,151,000	0
Asset impairment	$ 564,495,000	$ 0

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Impairment - Narrative (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) $ / bbl	Dec. 31, 2019 USD ($) $ / bbl
Property, Plant and Equipment [Line Items]
Impairment of oil and gas properties	$ 560,344,000	$ 0
Oil and gas properties, discounted rate	10.00%
Historical prices, discounted rate	10.00%
Percent of decrease in proved oil and gas reserves from prior year	4.00%
Inventory impairment	$ 4,151,000	0
Goodwill impairment	$ 102,581,000	$ 0
Crude Oil and NGL
Property, Plant and Equipment [Line Items]
Average Brent price per barrel (in USD per barrel) | $ / bbl	43.43	64.20

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Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Trade	$ 70,450	$ 151,747
Royalties	1,570	5,758
Employee compensation	1,701	6,861
Other	27,063	31,147
Total	$ 100,784	$ 195,513

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Debt and Debt Issuance Costs - Schedule of Debt (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	May 20, 2019	Feb. 15, 2018
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (18,124,000)	$ (21,081,000)
Long-term lease obligation	2,894,000	3,540,000
Long-term debt	774,770,000	700,459,000
Accounts Payable
Debt Instrument [Line Items]
Finance lease, liability, current	3,300,000	3,300,000
Senior Notes | 6.25% Senior Notes
Debt Instrument [Line Items]
Stated interest rate				6.25%
Long-term debt, gross	300,000,000	300,000,000
Senior Notes | 7.75% Senior Notes due 2027
Debt Instrument [Line Items]
Stated interest rate			7.75%
Long-term debt, gross	300,000,000	300,000,000
Revolving credit facility | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 190,000,000	$ 118,000,000

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Debt and Debt Issuance Costs - Senior Notes (Details) - Senior Notes - USD ($)	May 23, 2019	Feb. 15, 2018	May 20, 2019
7.75% Senior Notes due 2027
Debt Instrument [Line Items]
Face amount			$ 300,000,000.0
Stated interest rate			7.75%
Redemption price (as a percent)	100.00%
7.75% Senior Notes due 2027 | 2023
Debt Instrument [Line Items]
Redemption price (as a percent)	103.875%
7.75% Senior Notes due 2027 | 2024
Debt Instrument [Line Items]
Redemption price (as a percent)	101.938%
7.75% Senior Notes due 2027 | 2025 and Thereafter
Debt Instrument [Line Items]
Redemption price (as a percent)	100.00%
6.25% Senior Notes
Debt Instrument [Line Items]
Face amount		$ 300,000,000.0
Stated interest rate		6.25%
Redemption price (as a percent)		100.00%
6.25% Senior Notes | 2023
Debt Instrument [Line Items]
Redemption price (as a percent)		101.563%
6.25% Senior Notes | 2022
Debt Instrument [Line Items]
Redemption price (as a percent)		103.125%
6.25% Senior Notes | 2024 and Thereafter
Debt Instrument [Line Items]
Redemption price (as a percent)		100.00%

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Debt and Debt Issuance Costs - Credit Facility (Details) - Credit Agreement - Revolving Credit Facility - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Oct. 01, 2021	Jun. 30, 2021	Jun. 29, 2021	Jun. 01, 2020	May 31, 2020
Line of Credit Facility [Line Items]
Current borrowing capacity						$ 225,000,000.0	$ 300,000,000.0
Forecast
Line of Credit Facility [Line Items]
Maximum borrowing capacity, decrease				$ 20,000,000.0	$ 15,000,000.0
Minimum
Line of Credit Facility [Line Items]
Debt to EBITDAX, ratio						400.00%
Interest rate on undrawn amounts	0.73%	0.41%
Minimum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.90%	1.65%
Minimum | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.90%	0.65%
Minimum | December 31, 2020 and March 31, 2021
Line of Credit Facility [Line Items]
EBITDAX to interest expense, ratio						150.00%
Minimum | June 30, 2021 and September 30, 2021
Line of Credit Facility [Line Items]
EBITDAX to interest expense, ratio						200.00%
Minimum | October 1, 2021 and Thereafter
Line of Credit Facility [Line Items]
EBITDAX to interest expense, ratio						250.00%
Maximum
Line of Credit Facility [Line Items]
Senior secured debt to EBITDAX ratio						250.00%
Interest rate on undrawn amounts	1.23%	0.91%
Maximum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on variable rate	4.90%	3.65%
Maximum | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	3.90%	2.65%
Maximum | Forecast
Line of Credit Facility [Line Items]
Debt to EBITDAX, ratio			400.00%
Senior secured debt to EBITDAX ratio			300.00%
EBITDAX to interest expense, ratio			250.00%
Readily available
Line of Credit Facility [Line Items]
Current borrowing capacity	$ 215,000,000.0

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Debt and Debt Issuance Costs - Schedule of Total Interest Expense Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Contractual interest and other financing expenses	$ 50,515	$ 39,892
Amortization of debt issuance costs	3,625	3,376
Interest expense	$ 54,140	$ 43,268

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Share Capital - Schedule of Common Stock (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity
Ending Balance (in shares)	366,981,556
Common shares, outstanding (in shares)	366,981,556	366,981,556
Common Stock
Increase (Decrease) in Stockholders' Equity
Beginning Balance (in shares)	387,079,027
Shares repurchased and canceled (in shares)	(20,097,471)
Ending Balance (in shares)	366,981,556
Common shares, outstanding (in shares)	366,981,556	366,981,556

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Share Capital - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jun. 27, 2012	Jun. 26, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized share capital (in shares)	595,000,000
Common shares, par value (in USD per share)	$ 0.001	$ 0.001
Preferred Stock, shares authorized (in shares)	25,000,000
Preferred Stock, par value (in USD per share)	$ 0.001
Common stock available for issuance (in shares)			39,806,100	23,306,100
Share-based compensation	$ 1,216	$ 1,430
Unrecognized compensation cost	$ 5,900	$ 6,700
Weighted average period of recognition	1 year 8 months 12 days
Weighted average remaining contractual term	3 years 2 months 12 days
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized share capital (in shares)	570,000,000
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards granted (as a percent)	80.00%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards granted (as a percent)	20.00%

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Share Capital - Schedule of Information About PSU, DSU, RSU and Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Number of Outstanding Stock Options
Balance, Beginning of period (in shares)	10,612,872
Granted (in shares)	8,893,140
Exercised (in shares)	0
Forfeited (in shares)	(1,038,093)
Expired (in shares)	(3,022,970)
Balance, End of period (in shares)	15,444,949
Exercisable, at end of period (in shares)	5,443,796
Vested, or expected to vest, at end of period through the life of the options (in shares)	14,938,829
Weighted Average Exercise Price /Stock Option ($)
Balance, Beginning of period (in USD per share) | $ / shares	$ 2.78
Granted (in USD per share) | $ / shares	0.70
Exercised (in USD per share) | $ / shares	0
Forfeited (in USD per share) | $ / shares	2.04
Expired (in USD per share) | $ / shares	3.42
Balance, End of period (in USD per share) | $ / shares	1.50
Exercisable, at end of period (in USD per share) | $ / shares	2.39
Vested, or expected to vest, at end of period through the life of the options (in USD per share) | $ / shares	$ 1.53
PSUs
Number of Outstanding Share Units
Balance, Beginning of period (in shares)	11,371,367
Granted (in shares)	15,897,575
Exercised (in shares)	(2,366,351)
Forfeited (in shares)	(1,629,187)
Expired (in shares)	0
Balance, End of period (in shares)	23,273,404
DSUs
Number of Outstanding Share Units
Balance, Beginning of period (in shares)	1,251,994
Granted (in shares)	2,815,903
Exercised (in shares)	0
Forfeited (in shares)	0
Expired (in shares)	0
Balance, End of period (in shares)	4,067,897

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Share Capital - PSUs (Narrative) (Details) - PSUs - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Vested and will be settled in cash (in shares)	2,700,000	2,400,000
Award subject to targets relating to total shareholder return (as a percent)	50.00%
Award subject to targets relating to net asset value (as a percent)	25.00%
Net present value discount rate	10.00%
Award subject to targets relating to execution of corporate strategy (as a percent)	25.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of PSUs that vest (as a percent)	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of PSUs that vest (as a percent)	200.00%

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Share Capital - DSUs (Narrative) (Details)	12 Months Ended
	Dec. 31, 2020
DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
DSUs that will vest at such time the grantee ceases to be a member (as a percent)	100.00%

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Share Capital - Stock Options (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2013	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award, common stock for purchase, exercise price		1
Options exercised (in shares)		0
Proceeds from exercise of stock options		$ 0	$ 0
Share-based compensation arrangement by share-based payment award, options, vested and expected to vest, outstanding, weighted average remaining contractual term		3 years 2 months 12 days
Weighted average remaining contractual term of exercisable stock options		1 year 10 months 24 days
Weighted average grant date fair value for options granted (in USD per share)		$ 0.29	$ 0.89	$ 1.15
Weighted average grant date fair value for options vested (in USD per share)		$ 0.79	$ 1.10
Total fair value of stock options vested		$ 1,900	$ 1,900
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercised (in shares)		0	0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Expected term during grantee's service	5 years	5 years
Expected term after end of grantee's service	3 months

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Share Capital - Schedule of Assumptions Using the Black-Scholes Option Pricing Model (Details)	1 Months Ended	12 Months Ended
	May 31, 2013	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average volatility (as a percent)		52.00%	51.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility, minimum		50.00%	48.00%
Volatility, maximum		69.00%	54.00%
Risk free interest rate, minimum		0.30%	1.50%
Risk free interest rate, maximum		1.70%	2.50%
Expected term	5 years	5 years
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term			4 years
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term			5 years

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Share Capital - Schedule Of Weighted Average Shares Outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Weighted average number of common and exchangeable shares outstanding (in shares)	366,981,556	376,495,306
Shares issuable pursuant to stock options (in shares)	0	87,204
Shares assumed to be purchased from proceeds of stock options (in shares)	0	(74,698)
Weighted average number of diluted common and exchangeable shares outstanding (in shares)	366,981,556	376,507,812

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Share Capital - Weighted Average Shares Outstanding (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019 shares
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average options excluded from diluted loss per share calculation (in shares)	9,465,737

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Asset Retirement Obligation - Schedule of Changes in Carrying Amount of Asset Retirement Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis
Balance, beginning of year	$ 43,419	$ 43,799
Liability incurred	909	7,034
Settlements	(201)	(846)
Accretion	3,464	3,436
Revisions in estimated liability	623	(10,004)
Balance, end of year	$ 48,214	$ 43,419

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Asset Retirement Obligation - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]
Fair value of assets legally restricted for purposes of settling asset retirement obligations	$ 3.8	$ 2.8

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Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Revenue, information used to assess variable consideration constraint, adjustment for quality and transportation	25.00%	16.00%
Contract with customer, asset, net, current	$ 0.1	$ 0.1
Revenue from Contract with Customer | Product Concentration Risk
Concentration Risk [Line Items]
Sales to each significant customer as % of oil and gas sales	100.00%	100.00%
Revenue from Contract with Customer | Product Concentration Risk | Colombia | Customer 1
Concentration Risk [Line Items]
Sales to each significant customer as % of oil and gas sales	41.00%
Revenue from Contract with Customer | Product Concentration Risk | Colombia | Customer 2
Concentration Risk [Line Items]
Sales to each significant customer as % of oil and gas sales	31.00%
Revenue from Contract with Customer | Product Concentration Risk | Colombia | Customer 3
Concentration Risk [Line Items]
Sales to each significant customer as % of oil and gas sales	25.00%

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COVID-19 Related Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Unusual or Infrequent Items, or Both [Abstract]
Operating expenses	$ 2,482	$ 0
Transportation costs	197	0
COVID-19 costs	$ 2,679	$ 0

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Taxes - Schedule of Income Tax Expense Reported (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
United States	$ (19,065)	$ (27,984)
Foreign	(834,296)	123,959
(LOSS) INCOME BEFORE INCOME TAXES	$ (853,361)	$ 95,975
Statutory rate	32.00%	33.00%
Income tax (recovery) expense expected	$ (273,076)	$ 31,672
Impact of foreign taxes	26,668	9,387
Foreign currency translation	48,734	11,527
Goodwill Impairment	32,826	0
Stock-based compensation	666	430
Change in valuation allowance	75,241	3,429
Non-deductible third party royalty in Colombia	697	2,240
Other permanent differences	5,349	6,082
Non-deductible investment loss (gain) (PetroTal)	7,501	(7,482)
INCOME TAX EXPENSE (RECOVERY)	$ (75,394)	$ 57,285
Effective tax rate	9.00%	60.00%
Current income tax expense
Foreign	$ 754	$ 17,058
Current income tax expense	754	17,058
Deferred income tax expense (recovery)
Foreign	$ (76,148)	$ 40,227

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Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax benefit of operating loss carryforwards	$ 100,616	$ 73,096
Tax basis in excess of book basis	37,698	544
Foreign tax credits and other accruals	86,664	76,720
Tax benefit of capital loss carryforwards	27,661	22,710
Deferred tax assets before valuation allowance	252,639	173,070
Valuation allowance	(195,321)	(129,067)
Deferred tax assets - long-term	57,318	44,003
Deferred tax liabilities	0	59,762
Net deferred tax assets (liabilities)	$ 57,318
Net deferred tax assets (liabilities)		$ 15,759

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Taxes - Summary of Operating Loss and Capital Loss Carryforwards (Details) - USD ($)	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2017
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	$ 252,000,000.0
Credit carryforward	3,900,000
Operating loss carryforwards, not subject to limitations			$ 33,700,000
Operating loss carryforwards, subject to limitations			$ 218,300,000
Unrecognized tax benefits	0	$ 0
Impairment of taxes receivable	1,400,000
Internal Revenue Service (IRS)
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	50,500,000	46,000,000.0
Canada Revenue Agency
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	31,500,000	33,100,000
Canada Revenue Agency | Capital Loss Carryforward
Tax Credit Carryforward [Line Items]
Credit carryforward	197,500,000	240,500,000
Colombian Tax and Customs National Authority
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	140,500,000	115,600,000
Colombian Tax and Customs National Authority | Capital Loss Carryforward
Tax Credit Carryforward [Line Items]
Credit carryforward	$ 1,500,000	$ 1,000,000.0

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Commitments and Contingencies - Schedule of Future Minimum Payments Under Non-Cancelable Agreements (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Total	$ 10,535
2021	5,827
2022	3,821
2023	860
2024	27
2025	0
Thereafter	0
Operating leases
Total	4,910
2021	2,330
2022	2,077
2023	503
2024	0
2025	0
Thereafter	0
Finance leases
Total	4,725
2021	3,197
2022	1,444
2023	57
2024	27
2025	0
Thereafter	0
Software and Telecommunication
Unrecorded Unconditional Purchase Obligation [Line Items]
Total	900
2021	300
2022	300
2023	300
2024	0
2025	0
Thereafter	$ 0

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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Promissory notes as security for letters of credit	$ 100.6	$ 120.6

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Financial Instruments, Fair Value Measurement, Credit Risk and Foreign Exchange Risk - Narrative (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2020 $ / shares	Dec. 31, 2019 $ / shares	May 20, 2019	Feb. 15, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment	$ 48,323	$ 94,741
Foreign currency transaction gain, deferred tax assets	12
Foreign currency transaction gain, tax receivable	26
Foreign currency transaction gain, investment	400
Letters of credits from customers	$ 8,900
Colombia
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revenues received in U.S. dollars (as a percent)	100.00%
Colombia | Geographic Concentration Risk | Oil and natural gas sales
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Sales to each significant customer as % of oil and gas sales	100.00%	100.00%
6.25% Senior Notes | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate						6.25%
7.75% Senior Notes due 2027 | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate					7.75%
Reported Value Measurement | 7.75% Senior Notes due 2027 | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value disclosure	$ 290,900
Reported Value Measurement | 6.25% Senior Notes due 2025 | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value disclosure	292,300
Estimate of Fair Value Measurement | 7.75% Senior Notes due 2027 | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value disclosure	206,900
Estimate of Fair Value Measurement | 6.25% Senior Notes due 2025 | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value disclosure	205,500
PetroTal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment	$ 48,300	$ 94,700
Closing share price (in dollars per share) | (per share)	$ 0.20	$ 0.38	$ 0.25	$ 0.50

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Financial Instruments, Fair Value Measurement, Credit Risk and Foreign Exchange Risk - Schedule of Fair Value of Trading Securities, Derivative Assets, and RSU and PSU Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Investment	$ 48,323	$ 94,741
Derivative liability	12,050	775
PSU and DSU liability	4,760	7,859
Fair value of liabilities	$ 16,810	$ 8,634

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Financial Instruments, Fair Value Measurement, Credit Risk and Foreign Exchange Risk - Schedule of Losses or Gains on Financial Instruments Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment loss (gain)	$ 46,883	$ (49,884)
Financial instruments loss	1,164	0
Financial instruments loss	50,982	(46,215)
Commodity price derivative (gain) loss
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative loss (gain)	(220)	3,642
Foreign currency derivative loss
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative loss (gain)	$ 3,155	$ 27

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Financial Instruments, Fair Value Measurement, Credit Risk and Foreign Exchange Risk - Commodity Price Risk (Details) - Forecast - Commodity Hedge	6 Months Ended
	Dec. 31, 2021 $ / bbl bbl	Jun. 30, 2021 $ / bbl bbl
Three-way Collars: January 1, to June 30, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (in barrels of oil per day) | bbl		14,000
Premium (in dollars per barrel)		0.21
Three-way Collars: January 1, to June 30, 2021 | Purchased | Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor price (in dollars per barrel)		45.14
Three-way Collars: January 1, to June 30, 2021 | Sold | Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Sold put/call ($/bbl, Weighted Average)		36.43
Three-way Collars: January 1, to June 30, 2021 | Sold | Call
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Sold put/call ($/bbl, Weighted Average)		51.45
Collars: January 1, to June 30, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (in barrels of oil per day) | bbl		1,000
Collars: January 1, to June 30, 2021 | Purchased | Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor price (in dollars per barrel)		45.00
Collars: January 1, to June 30, 2021 | Sold | Call
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Sold put/call ($/bbl, Weighted Average)		50.40
Swaptions: July 1, to December 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (in barrels of oil per day) | bbl	3,000
Swaptions: July 1, to December 31, 2021 | Sold | Call
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Sold put/call ($/bbl, Weighted Average)	56.75
Three-way Collars: July 1, to December 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (in barrels of oil per day) | bbl	4,000
Three-way Collars: July 1, to December 31, 2021 | Purchased | Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor price (in dollars per barrel)	55.00
Three-way Collars: July 1, to December 31, 2021 | Sold | Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Sold put/call ($/bbl, Weighted Average)	45.00
Three-way Collars: July 1, to December 31, 2021 | Sold | Call
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Sold put/call ($/bbl, Weighted Average)	68.00

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Financial Instruments, Fair Value Measurement, Credit Risk and Foreign Exchange Risk - Foreign Exchange Risk (Details) - Forecast - Collars: March 1, to December 31, 2021 $ in Thousands, $ in Thousands	Dec. 31, 2021 COP ($) $ / collar	Dec. 31, 2021 USD ($) $ / collar
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount hedged	$ 10,000	$ 3,051
Sold | Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor Price (COP, Weighted Average)	3,500	3,500
Purchased | Call
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cap Price (COP, Weighted Average)	3,630	3,630

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Supplemental Cash Flow Information - Reconciliation of Cash, Cash Equivalents, and Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 13,687	$ 8,301
Restricted cash and cash equivalents - current	427	516
Restricted cash and cash equivalents - long-term	3,409	2,258
Cash, cash equivalents, restricted cash, and restricted cash equivalents	$ 17,523	$ 11,075	$ 54,308

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Supplemental Cash Flow Information - Schedule of Net Changes in Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Accounts receivable and other long-term assets	$ 27,607	$ (5,680)
Derivatives	2,302	(638)
Inventory	(2,628)	(3,179)
Other prepaids	(279)	583
Accounts payable and accrued and other long-term liabilities	(47,194)	(1,367)
Prepaid tax and taxes receivable and payable	56,254	(83,593)
Net changes in assets and liabilities from operating activities	$ 36,062	$ (93,874)

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Supplemental Cash Flow Information - Schedule of Additional Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Cash paid for income taxes	$ 15,476	$ 49,196
Cash paid for interest	50,209	37,767
Non-cash investing activities
Net liabilities related to property, plant and equipment, end of year	$ 28,711	$ 77,353

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Subsequent Events (Details) - Subsequent Event - Petro Tal $ in Millions	2 Months Ended
	Feb. 24, 2021 USD ($) shares
Subsequent Event [Line Items]
Number of shares disposed, percent	44.00%
Number of shares disposed (in shares) | shares	109,006,250
Proceeds from sale	$ 14.9
Loss on disposition of stock	$ 5.1