10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

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

For the quarterly period ended June 30, 2021

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 No.: 0-26823

ALLIANCE RESOURCE PARTNERS, L.P.

(Exact name of registrant as specified in its charter)

Delaware	73-1564280
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)

1717 South Boulder Avenue, Suite 400, Tulsa, Oklahoma 74119

(Address of principal executive offices and zip code)

(918) 295-7600

(Registrant's telephone number, including area code)

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. [X] Yes   [   ] No

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

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

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

Title of each class	Trading Symbol	Name of each exchange on which registered
Common units representing limited partner interests	ARLP	NASDAQ Global Select Market

As of August 6, 2021, 127,195,219 common units are outstanding.

TABLE OF CONTENTS

		Page
ITEM 1.	Financial Statements (Unaudited)
	ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES
	Condensed Consolidated Balance Sheets as of June 30, 2021 and December 31, 2020	1
	Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2021 and 2020	2
	Condensed Consolidated Statements of Comprehensive Income (Loss) for the three and six months ended June 30, 2021 and 2020	3
	Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2021 and 2020	4
	Notes to Condensed Consolidated Financial Statements	5
	1.     Organization and Presentation	5
	2.     Long-Lived Asset Impairments	6
	3. Goodwill Impairment	6
	4.     Contingencies	6
	5.     Inventories	7
	6.     Fair Value Measurements	7
	7.     Long-Term Debt	8
	8.    Variable Interest Entities	10
	9.    Investment	11
	10.   Partners' Capital	11
	11.   Revenue from Contracts with Customers	13
	12.   Earnings per Limited Partner Unit	14
	13.   Workers' Compensation and Pneumoconiosis	14
	14.   Common Unit-Based Compensation Plans	15
	15.   Components of Pension Plan Net Periodic Benefit Cost	17
	16.   Segment Information	17
	17. Subsequent Events	20
ITEM 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	21
ITEM 3.	Quantitative and Qualitative Disclosures about Market Risk	35
ITEM 4.	Controls and Procedures	36
	Forward-Looking Statements	37
PART II
OTHER INFORMATION
ITEM 1.	Legal Proceedings	39
ITEM 1A.	Risk Factors	39
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	39
ITEM 3.	Defaults Upon Senior Securities	39
ITEM 4.	Mine Safety Disclosures	39
ITEM 5.	Other Information	39
ITEM 6.	Exhibits	40

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PART I

FINANCIAL INFORMATION

ITEM 1.    FINANCIAL STATEMENTS

ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands, except unit data)

(Unaudited)

	June 30,		December 31,
	2021		2020
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	37,749	$	55,574
Trade receivables		132,033		104,579
Other receivables		2,067		3,481
Inventories, net		74,505		56,407
Advance royalties		2,063		4,168
Prepaid expenses and other assets		12,536		21,565
Total current assets		260,953		245,774
PROPERTY, PLANT AND EQUIPMENT:
Property, plant and equipment, at cost		3,548,857		3,554,090
Less accumulated depreciation, depletion and amortization		(1,820,903)		(1,753,845)
Total property, plant and equipment, net		1,727,954		1,800,245
OTHER ASSETS:
Advance royalties		65,087		56,791
Equity method investments		26,274		27,268
Goodwill		4,373		4,373
Operating lease right-of-use assets		14,713		15,004
Other long-term assets		16,159		16,561
Total other assets		126,606		119,997
TOTAL ASSETS	$	2,115,513	$	2,166,016
LIABILITIES AND PARTNERS' CAPITAL
CURRENT LIABILITIES:
Accounts payable	$	55,840	$	47,511
Accrued taxes other than income taxes		21,019		25,054
Accrued payroll and related expenses		38,951		28,524
Accrued interest		5,000		5,132
Workers' compensation and pneumoconiosis benefits		10,618		10,646
Current finance lease obligations		802		766
Current operating lease obligations		1,823		1,854
Other current liabilities		14,119		21,919
Current maturities, long-term debt, net		55,558		73,199
Total current liabilities		203,730		214,605
LONG-TERM LIABILITIES:
Long-term debt, excluding current maturities, net		426,643		519,421
Pneumoconiosis benefits		106,403		105,068
Accrued pension benefit		42,031		46,965
Workers' compensation		44,868		47,521
Asset retirement obligations		122,559		121,487
Long-term finance lease obligations		1,047		1,458
Long-term operating lease obligations		13,010		13,078
Other liabilities		20,702		24,146
Total long-term liabilities		777,263		879,144
Total liabilities		980,993		1,093,749
PARTNERS' CAPITAL:
ARLP Partners' Capital:
Limited Partners - Common Unitholders 127,195,219 units outstanding		1,206,511		1,148,565
Accumulated other comprehensive loss		(83,212)		(87,674)
Total ARLP Partners' Capital		1,123,299		1,060,891
Noncontrolling interest		11,221		11,376
Total Partners' Capital		1,134,520		1,072,267
TOTAL LIABILITIES AND PARTNERS' CAPITAL	$	2,115,513	$	2,166,016

See notes to condensed consolidated financial statements.

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ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except unit and per unit data)

(Unaudited)

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
SALES AND OPERATING REVENUES:
Coal sales	$	325,974	$	236,286	$	613,461	$	550,923
Oil & gas royalties		17,114		7,786		31,113		22,025
Transportation revenues		12,058		5,757		23,126		10,496
Other revenues		7,297		5,373		13,365		22,521
Total revenues		362,443		255,202		681,065		605,965
EXPENSES:
Operating expenses (excluding depreciation, depletion and amortization)		213,039		187,164		409,559		421,506
Transportation expenses		12,058		5,757		23,126		10,496
Outside coal purchases		114		—		114		—
General and administrative		17,492		13,822		32,996		27,260
Depreciation, depletion and amortization		64,733		83,559		123,935		157,480
Asset impairments		—		—		—		24,977
Goodwill impairment		—		—		—		132,026
Total operating expenses		307,436		290,302		589,730		773,745
INCOME (LOSS) FROM OPERATIONS		55,007		(35,100)		91,335		(167,780)
Interest expense (net of interest capitalized for the three and six months ended June 30, 2021 and 2020 of $105, $509, $191 and $1,066, respectively)		(9,842)		(11,446)		(20,238)		(23,725)
Interest income		15		30		32		82
Equity method investment income		341		137		403		588
Other expense		(1,351)		(377)		(2,548)		(733)
INCOME (LOSS) BEFORE INCOME TAXES		44,170		(46,756)		68,984		(191,568)
INCOME TAX EXPENSE (BENEFIT)		5		(77)		(7)		(182)
NET INCOME (LOSS)		44,165		(46,679)		68,991		(191,386)
LESS: NET LOSS (INCOME) ATTRIBUTABLE TO NONCONTROLLING INTEREST		(130)		15		(208)		(61)
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP	$	44,035	$	(46,664)	$	68,783	$	(191,447)
EARNINGS PER LIMITED PARTNER UNIT - BASIC AND DILUTED	$	0.34	$	(0.37)	$	0.53	$	(1.51)
WEIGHTED-AVERAGE NUMBER OF UNITS OUTSTANDING – BASIC AND DILUTED		127,195,219		127,195,219		127,195,219		127,133,764

See notes to condensed consolidated financial statements.

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ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(In thousands)

(Unaudited)

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
NET INCOME (LOSS)	$	44,165	$	(46,679)	$	68,991	$	(191,386)
OTHER COMPREHENSIVE INCOME (LOSS):
Defined benefit pension plan
Amortization of prior service cost (1)		46		47		93		93
Amortization of net actuarial loss (1)		1,142		1,063		2,283		2,127
Total defined benefit pension plan adjustments		1,188		1,110		2,376		2,220
Pneumoconiosis benefits
Amortization of net actuarial loss (gain) (1)		1,043		(171)		2,086		(343)
Total pneumoconiosis benefits adjustments		1,043		(171)		2,086		(343)
OTHER COMPREHENSIVE INCOME		2,231		939		4,462		1,877
COMPREHENSIVE INCOME (LOSS)		46,396		(45,740)		73,453		(189,509)
Less: Comprehensive loss (income) attributable to noncontrolling interest		(130)		15		(208)		(61)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ARLP	$	46,266	$	(45,725)	$	73,245	$	(189,570)

(1) Amortization of prior service cost and net actuarial gain or loss is included in the computation of net periodic benefit cost (see Notes 13 and 15 for additional details).

See notes to condensed consolidated financial statements.

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ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)

	Six Months Ended
	June 30,
	2021		2020
CASH FLOWS FROM OPERATING ACTIVITIES	$	158,216	$	170,168
CASH FLOWS FROM INVESTING ACTIVITIES:
Property, plant and equipment:
Capital expenditures		(55,626)		(84,245)
Change in accounts payable and accrued liabilities		1,547		(6,508)
Proceeds from sale of property, plant and equipment		2,838		2,739
Distributions received from investments in excess of cumulative earnings		994		551
Net cash used in investing activities		(50,247)		(87,463)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under securitization facility		35,000		12,800
Payments under securitization facility		(52,800)		(47,700)
Proceeds from equipment financings		—		14,705
Payments on equipment financings		(8,535)		(6,494)
Borrowings under revolving credit facilities		15,000		70,000
Payments under revolving credit facilities		(102,500)		(60,000)
Borrowings from line of credit		1,830		—
Payments on finance lease obligations		(375)		(8,043)
Payment of debt issuance costs		(6)		(5,776)
Payments for taxes related to net settlement of issuance of units in deferred compensation plans		—		(1,310)
Distributions paid to Partners		(13,045)		(51,753)
Other		(363)		(510)
Net cash used in financing activities		(125,794)		(84,081)
NET CHANGE IN CASH AND CASH EQUIVALENTS		(17,825)		(1,376)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD		55,574		36,482
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	37,749	$	35,106
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest	$	18,817	$	23,337
Cash paid for income taxes	$	11	$	4
SUPPLEMENTAL NON-CASH ACTIVITY:
Accounts payable for purchase of property, plant and equipment	$	7,278	$	7,996
Right-of-use assets acquired by operating lease	$	—	$	278
Market value of common units issued under deferred compensation plans before tax withholding requirements	$	—	$	3,837

See notes to condensed consolidated financial statements.

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ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1.ORGANIZATION AND PRESENTATION

Significant Relationships Referenced in Notes to Condensed Consolidated Financial Statements

● References to "we," "us," "our" or "ARLP Partnership" mean the business and operations of Alliance Resource Partners, L.P., the parent company, as well as its consolidated subsidiaries.

● References to "ARLP" mean Alliance Resource Partners, L.P., individually as the parent company, and not on a consolidated basis.

● References to "MGP" mean Alliance Resource Management GP, LLC, ARLP's general partner.  

● References to "Mr. Craft" mean Joseph W. Craft III, the Chairman, President and Chief Executive Officer of MGP.

● References to "Intermediate Partnership" mean Alliance Resource Operating Partners, L.P., the intermediate partnership of Alliance Resource Partners, L.P.

● References to "Alliance Coal" mean Alliance Coal, LLC, the holding company for our coal mining operations.

● References to "Alliance Minerals" mean Alliance Minerals, LLC, the holding company for our oil and gas minerals interests.

● References to "Alliance Resource Properties" mean Alliance Resource Properties, LLC, the land holding company for certain of our coal mineral interests, including the subsidiaries of Alliance Resource Properties, LLC.

Organization

ARLP is a Delaware limited partnership listed on the NASDAQ Global Select Market under the ticker symbol "ARLP."  ARLP was formed in May 1999 and completed its initial public offering on August 19, 1999 when it acquired substantially all of the coal production and marketing assets of Alliance Resource Holdings, Inc., a Delaware corporation, and its subsidiaries.  We are managed by our general partner, MGP, a Delaware limited liability company which holds a non-economic general partner interest in ARLP.  

Basis of Presentation

The accompanying condensed consolidated financial statements include the accounts and operations of the ARLP Partnership and present our financial position as of June 30, 2021 and December 31, 2020, the results of our operations and comprehensive income (loss) for the three and six months ended June 30, 2021 and 2020, and cash flows for the six months ended June 30, 2021 and 2020.  All intercompany transactions and accounts have been eliminated.

These condensed consolidated financial statements and notes are prepared pursuant to the rules and regulations of the Securities and Exchange Commission for interim reporting and do not include all the information normally included with financial statements prepared in accordance with generally accepted accounting principles ("GAAP") of the United States.  These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2020.

These condensed consolidated financial statements and notes are unaudited. However, in the opinion of management, these condensed consolidated financial statements reflect all normal recurring adjustments necessary for a fair presentation of the results for the periods presented.  Results for interim periods are not necessarily indicative of results to be expected for the full year ending December 31, 2021.

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Use of Estimates

The preparation of the ARLP Partnership's condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts and disclosures in our condensed consolidated financial statements.  Actual results could differ from those estimates.

2.LONG-LIVED ASSET IMPAIRMENTS

During the first quarter of 2020, we recorded $23.5 million of non-cash asset impairment charges in our Illinois Basin Coal Operations segment due to sealing our idled Gibson North mine, resulting in its permanent closure, and a decrease in the fair value of certain mining equipment at our idled operations and greenfield coal reserves as a result of weakened coal market conditions. During the same period, we also recorded an asset impairment charge of $1.5 million in our Coal Royalties segment due to a decrease in the fair value of greenfield coal reserves held by Alliance Resource Properties near our coal mining operations in the Illinois Basin. See Note 16 – Segment Information for more information about our segments.

The fair values of the impaired assets were determined using a market approach, which represents Level 3 fair value measurements under the fair value hierarchy.  The fair value analysis used assumptions regarding the marketability of certain mining and reserve assets near our Illinois Basin coal mining operations.

3.GOODWILL IMPAIRMENT

During the first quarter of 2020, we considered whether an interim test of our consolidated goodwill of $136.4 million was necessary.  Our consolidated goodwill included $132.0 million recorded in our Illinois Basin Coal Operations segment in conjunction with our acquisition of the Hamilton County Coal, LLC ("Hamilton") mine on July 31, 2015.  We assessed certain events and changes in circumstances, including a) adverse industry and market developments, including the impact of the COVID-19 pandemic, b) our response to these developments, including temporarily ceasing production at several mines, including our Hamilton mine and c) our actual performance during the quarter.  After consideration of these events and changes in circumstances, we performed an interim test of the goodwill associated with Hamilton comparing Hamilton's carrying amount to its fair value.

We estimated the fair value of Hamilton using an income approach utilizing a discounted cash flow model.  The assumptions used in the discounted cash flow model included estimated production, forward coal prices, operating expenses, capital expenditures and a weighted average cost of capital.  Our forecasts of future cash flows considered market conditions at the time of the assessment and our estimate of the mine's performance in future years based on the information available to us. Key assumptions used in our valuation were not observable in active markets; therefore, the fair value measurements represent Level 3 fair value measurements.  The fair value of Hamilton was determined to be below its carrying amount (including goodwill) by more than the recorded balance of goodwill associated with the mine.  Accordingly, we recognized an impairment charge of $132.0 million consisting of the total carrying amount of goodwill associated with Hamilton.  This impairment charge reduced our consolidated goodwill balance to $4.4 million. During the first quarter of 2020, we also performed an interim test on ARLP's remaining goodwill balances not associated with Hamilton and concluded no impairment was necessary for our other reporting units.

4.CONTINGENCIES

We are party to litigation that has been initiated against certain of our subsidiaries in which the plaintiffs allege violations of the Fair Labor Standards Act and Kentucky Wage and Hour Act due to an alleged failure to compensate for time "donning" and "doffing" equipment and to account for certain bonuses in the calculation of overtime rates and pay.  The plaintiffs seek class or collective action certification.  Because the litigation of these matters is in the early stages, we cannot reasonably estimate a range of potential exposure at this time.  We believe the plaintiffs’ claims are without merit and our ultimate exposure, if any, will not be material to our results of operations or financial position and we intend to defend the litigation vigorously.  However, if our current belief that the claims are without merit is not upheld, it is reasonably possible that the ultimate resolution of these matters could result in a potential loss that may be material to our results of operations.

We also have various other lawsuits, claims and regulatory proceedings incidental to our business that are pending against the ARLP Partnership.  We record an accrual for a potential loss related to these matters when, in management's

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opinion, such loss is probable and reasonably estimable.  Based on known facts and circumstances, we believe the ultimate outcome of these outstanding lawsuits, claims and regulatory proceedings will not have a material adverse effect on our financial condition, results of operations or liquidity.  However, if the results of these matters are different from management's current expectations and in amounts greater than our accruals, such matters could have a material adverse effect on our business and operations.

5.INVENTORIES

Inventories consist of the following:

	June 30,		December 31,
	2021		2020
	(in thousands)
Coal	$	40,091	$	19,756
Supplies (net of reserve for obsolescence of $5,548 and $5,547, respectively)		34,414		36,651
Total inventories, net	$	74,505	$	56,407

6.FAIR VALUE MEASUREMENTS

The following table summarizes our fair value measurements within the hierarchy not included elsewhere in these notes:

	June 30, 2021						December 31, 2020
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	(in thousands)
Long-term debt	$	—	$	479,993	$	—	$	—	$	518,317	$	—
Total	$	—	$	479,993	$	—	$	—	$	518,317	$	—

The carrying amounts for cash equivalents, accounts receivable, accounts payable, accrued and other liabilities approximate fair value due to the short maturity of those instruments.

The estimated fair value of our long-term debt, including current maturities, is based on interest rates that we believe are currently available to us in active markets for issuance of debt with similar terms and remaining maturities (See Note 7 – Long-Term Debt).  The fair value of debt, which is based upon these interest rates, is classified as a Level 2 measurement under the fair value hierarchy.

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7.LONG-TERM DEBT

Long-term debt consists of the following:

					Unamortized Discount and
	Principal				Debt Issuance Costs
	June 30,		December 31,		June 30,		December 31,
	2021		2020		2021		2020
	(in thousands)
Revolving credit facility	$	—	$	87,500	$	(6,067)	$	(7,196)
Senior notes		400,000		400,000		(3,506)		(3,964)
Securitization facility		38,100		55,900		—		—
May 2019 equipment financing		3,256		4,956		—		—
November 2019 equipment financing		37,231		42,367		—		—
June 2020 equipment financing		11,357		13,057		—		—
Line of credit		1,830		—		—		—
		491,774		603,780		(9,573)		(11,160)
Less current maturities		(55,558)		(73,199)		—		—
Total long-term debt	$	436,216	$	530,581	$	(9,573)	$	(11,160)

Credit Facility.  On March 9, 2020, our Intermediate Partnership entered into a Fifth Amended and Restated Credit Agreement (the "Credit Agreement") with various financial institutions.  The Credit Agreement provides for a $459.5 million revolving credit facility, including a sublimit of $125 million for the issuance of letters of credit and a sublimit of $15.0 million for swingline borrowings (the "Revolving Credit Facility"), with a termination date of March 9, 2024.

The Credit Agreement is guaranteed by certain of our Intermediate Partnership's material direct and indirect subsidiaries (the "Restricted Subsidiaries") and is secured by substantially all the assets of the Restricted Subsidiaries.  The Credit Agreement is also guaranteed by Alliance Minerals but the oil and gas minerals assets of Alliance Minerals and its direct and indirect subsidiaries (collectively with Alliance Minerals, the "Unrestricted Subsidiaries") are not collateral under the Credit Agreement.  Borrowings under the Revolving Credit Facility bear interest, at our option, at either (i) the Base Rate at the greater of three benchmarks or (ii) a Eurodollar Rate, plus margins for (i) or (ii), as applicable, that fluctuate depending upon the ratio of Consolidated Debt to Consolidated Cash Flow (each as defined in the Credit Agreement).  The Eurodollar Rate, with applicable margin, under the Revolving Credit Facility was 2.71% as of June 30, 2021.  On June 30, 2021, we had $21.8 million of letters of credit outstanding with $437.7 million available for borrowing under the Revolving Credit Facility. We incur an annual commitment fee of 0.35% on the undrawn portion of the Revolving Credit Facility.  We utilize the Revolving Credit Facility, as appropriate, for working capital requirements, capital expenditures and investments, scheduled debt payments and distribution payments.  

The Credit Agreement contains various restrictions affecting the Intermediate Partnership and its Restricted Subsidiaries including, among other things, restrictions on incurrence of additional indebtedness and liens, sale of assets, investments, mergers and consolidations and transactions with affiliates, including transactions with Unrestricted Subsidiaries.  In each case, these restrictions are subject to various exceptions.  In addition, the payment of cash distributions is restricted if such payment would result in a fixed charge coverage ratio of less than 1.0 to 1.0 (as defined in the Credit Agreement) for the four most recently ended fiscal quarters.  The Credit Agreement requires the Intermediate Partnership to maintain (a) a debt to cash flow ratio of not more than 2.5 to 1.0, (b) a cash flow to interest expense ratio of not less than 3.0 to 1.0 and (c) a first lien debt to cash flow ratio of not more than 1.5 to 1.0, in each case, during the four most recently ended fiscal quarters. The debt to cash flow ratio, cash flow to interest expense ratio and first lien debt to cash flow ratio were 1.08 to 1.0, 10.66 to 1.0 and 0.20 to 1.0, respectively, for the trailing twelve months ended June 30, 2021.  We remained in compliance with the covenants of the Credit Agreement as of June 30, 2021 and anticipate remaining in compliance with the covenants.  

Senior Notes.  On April 24, 2017, the Intermediate Partnership and Alliance Resource Finance Corporation (as co-issuer), a wholly owned subsidiary of the Intermediate Partnership ("Alliance Finance"), issued an aggregate principal amount of $400.0 million of senior unsecured notes due 2025 ("Senior Notes") in a private placement to qualified institutional buyers.  The Senior Notes have a term of eight years, maturing on May 1, 2025 (the "Term") and accrue interest at an annual rate of 7.5%.  Interest is payable semi-annually in arrears on each May 1 and November 1.  The

8

indenture governing the Senior Notes contains customary terms, events of default and covenants relating to, among other things, the incurrence of debt, the payment of distributions or similar restricted payments, undertaking transactions with affiliates and limitations on asset sales.  The issuers of the Senior Notes may redeem all or a part of the notes at any time at redemption prices set forth in the indenture governing the Senior Notes.    

Accounts Receivable Securitization.  On December 5, 2014, certain direct and indirect wholly owned subsidiaries of our Intermediate Partnership entered into a $100.0 million accounts receivable securitization facility ("Securitization Facility").  Under the Securitization Facility, certain subsidiaries sell certain trade receivables on an ongoing basis to our Intermediate Partnership, which then sells the trade receivables to AROP Funding, LLC ("AROP Funding"), a wholly owned bankruptcy-remote special purpose subsidiary of our Intermediate Partnership, which in turn borrows on a revolving basis up to $100.0 million secured by the trade receivables.  After the sale, Alliance Coal, as servicer of the assets, collects the receivables on behalf of AROP Funding.  The Securitization Facility bears interest based on a Eurodollar Rate.  The agreement governing the Securitization Facility contains customary terms and conditions, including limitations with regards to certain customer credit ratings.  In January 2021, we extended the term of the Securitization Facility to January 2022 and reduced the borrowing availability under the facility to $60.0 million.  The Securitization Facility was previously scheduled to mature in January 2021.  On June 30, 2021, we had a $38.1 million outstanding balance under the Securitization Facility.  

May 2019 Equipment Financing.  On May 17, 2019, the Intermediate Partnership entered into an equipment financing arrangement accounted for as debt, wherein the Intermediate Partnership received $10.0 million in exchange for conveying its interest in certain equipment owned indirectly by the Intermediate Partnership and entering into a master lease agreement for that equipment (the "May 2019 Equipment Financing"). The May 2019 Equipment Financing contains customary terms and events of default and provides for thirty-six monthly payments with an implicit interest rate of 6.25%, maturing on May 1, 2022. Upon maturity, the equipment will revert to the Intermediate Partnership.

November 2019 Equipment Financing.  On November 6, 2019, the Intermediate Partnership entered into an equipment financing arrangement accounted for as debt, wherein the Intermediate Partnership received $53.1 million in exchange for conveying its interest in certain equipment owned indirectly by the Intermediate Partnership and entering into a master lease agreement for that equipment (the "November 2019 Equipment Financing").  The November 2019 Equipment Financing contains customary terms and events of default and an implicit interest rate of 4.75%, providing for a four-year term with forty-seven monthly payments of $1.0 million and a balloon payment of $11.6 million upon maturity on November 6, 2023.  Upon maturity, the equipment will revert to the Intermediate Partnership.  

June 2020 Equipment Financing.  On June 5, 2020, the Intermediate Partnership entered into an equipment financing arrangement accounted for as debt, wherein the Intermediate Partnership received $14.7 million in exchange for conveying its interest in certain equipment owned indirectly by the Intermediate Partnership and entering into a master lease agreement for that equipment (the "June 2020 Equipment Financing"). The June 2020 Equipment Financing contains customary terms and events of default and provides for forty-eight monthly payments with an implicit interest rate of 6.1%, maturing on June 5, 2024. Upon maturity, the equipment will revert to the Intermediate Partnership.

Line of Credit.  On February 19, 2021, we entered into a line of credit arrangement with a related party for $5.0 million.  The line of credit has a maturity date of February 28, 2023, with an option to extend it for an additional six months and accrue interest at an annual rate of 3.50%.  Interest is payable quarterly commencing March 31, 2021, and continuing each March 31, June 30, September 30 and December 31 thereafter through and including February 28, 2023.  The agreement contains customary terms and events of default and is guaranteed by ARLP.  We utilize the line of credit, as appropriate, for capital expenditures and investments.  As of June 30, 2021, we had drawn $1.8 million under this agreement.

9

8.VARIABLE INTEREST ENTITIES

Cavalier Minerals

On November 10, 2014, our subsidiary, Alliance Minerals, and Bluegrass Minerals Management, LLC ("Bluegrass Minerals") entered into a limited liability company agreement (the "Cavalier Agreement") to create Cavalier Minerals JV, LLC ("Cavalier Minerals"), which was formed to indirectly acquire oil & gas mineral interests through its ownership in AllDale Minerals LP ("AllDale I") and AllDale Minerals II, LP ("AllDale II", and collectively with AllDale I, "AllDale I & II").  Alliance Minerals owns a 96% member interest in Cavalier Minerals, and Bluegrass Minerals owns a 4% member interest in Cavalier Minerals and a profits interest which entitles it to receive distributions equal to 25% of all distributions (including in liquidation) after all members have recovered their investment.  Distributions with respect to Bluegrass Minerals' profits interest will be offset by all distributions received by Bluegrass Minerals from the former general partners of AllDale I & II.  To date, there has been no profits interest distribution.  We hold the managing member interest in Cavalier Minerals.  Total contributions to and cumulative distributions from Cavalier Minerals are as follows:  

	Alliance		Bluegrass
	Minerals		Minerals
	(in thousands)
Contributions	$	143,112	$	5,963
Distributions		98,107		4,087

We have concluded that Cavalier Minerals is a variable interest entity ("VIE") which we consolidate as the primary beneficiary because we are the managing member and a substantial equity owner in Cavalier Minerals.  Bluegrass Minerals' equity ownership of Cavalier Minerals is accounted for as noncontrolling ownership interest in our condensed consolidated balance sheets.  In addition, earnings attributable to Bluegrass Minerals are recognized as noncontrolling interest in our condensed consolidated statements of income.

AllDale III

In February 2017, Alliance Minerals committed to directly invest $30.0 million in AllDale Minerals III, LP ("AllDale III") which was created for similar investment purposes as AllDale I & II.  Alliance Minerals completed funding of this commitment in 2018. Alliance Minerals' limited partner interest in AllDale III is 13.9%.

The AllDale III Partnership Agreement includes a 25% profits interest for the general partner, subject to a return hurdle equal to the greater of 125% of cumulative capital contributions and a 10% internal rate of return, and following an 80/20 "catch-up" provision for the general partner.  

Since AllDale III is structured as a limited partnership with the limited partners 1) not having the ability to remove the general partner and 2) not participating significantly in the operational decisions, we concluded that AllDale III is a VIE.  We are not the primary beneficiary of AllDale III as we do not have the power to direct the activities that most significantly impact AllDale III's economic performance.  We account for our ownership interest in the income or loss of AllDale III as an equity method investment.  We record equity income or loss based on AllDale III's distribution structure. See Note 9 – Investment for more information.

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9.INVESTMENT

AllDale III

As discussed in Note 8 – Variable Interest Entities, we account for our ownership interest in the income or loss of AllDale III as an equity method investment.  We record equity income or loss based on AllDale III's distribution structure.  The changes in our equity method investment in AllDale III for each of the periods presented were as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Beginning balance	$	26,907	$	28,114	$	27,268	$	28,529
Equity method investment income		341		137		403		588
Distributions received		(974)		(546)		(1,397)		(1,139)
Other		—		—		—		(273)
Ending balance	$	26,274	$	27,705	$	26,274	$	27,705

10.PARTNERS' CAPITAL

Distributions

Distributions paid or declared during 2020 and 2021 were as follows:

Payment Date	Per Unit Cash Distribution		Total Cash Distribution
			(in thousands)
February 14, 2020	$	0.4000	$	51,753
Total	$	0.4000	$	51,753
May 14, 2021	$	0.1000	$	13,045
August 13, 2021 (1)		0.1000		—
Total	$	0.2000	$	13,045

(1) On July 26, 2021, we declared this quarterly distribution payable on August 13, 2021 to all unitholders of record as of August 6, 2021.  

Unit Repurchase Program

In May 2018, the MGP board of directors approved the establishment of a unit repurchase program authorizing us to repurchase and retire up to $100 million of ARLP common units.  The program has no time limit and we may repurchase units from time to time in the open market or in other privately negotiated transactions. The unit repurchase program authorization does not obligate us to repurchase any dollar amount or number of units.  No unit repurchases were made during the six months ended June 30, 2021.  Since inception of the unit repurchase program, we have repurchased and retired 5,460,639 units at an average unit price of $17.12 for an aggregate purchase price of $93.5 million. The remaining authorized amount for unit repurchases under this program is $6.5 million.

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Change in Partners' Capital

The following tables present the quarterly change in Partners' Capital for the six months ended June 30, 2021 and 2020:

				Accumulated
	Number of	Limited		Other
	Limited Partner	Partners'		Comprehensive		Noncontrolling		Total Partners'
	Units	Capital		Income (Loss)		Interest		Capital
	(in thousands, except unit data)
Balance at January 1, 2021	127,195,219	$	1,148,565	$	(87,674)	$	11,376	$	1,072,267
Comprehensive income:
Net income	—		24,748		—		78		24,826
Actuarially determined long-term liability adjustments	—		—		2,231		—		2,231
Total comprehensive income									27,057
Common unit-based compensation	—		723		—		—		723
Distributions from consolidated company to noncontrolling interest	—		—		—		(141)		(141)
Balance at March 31, 2021	127,195,219		1,174,036		(85,443)		11,313		1,099,906
Comprehensive income:
Net income	—		44,035		—		130		44,165
Actuarially determined long-term liability adjustments	—		—		2,231		—		2,231
Total comprehensive income									46,396
Common unit-based compensation	—		1,485		—		—		1,485
Distributions on deferred common unit-based compensation	—		(324)		—		—		(324)
Distributions from consolidated company to noncontrolling interest	—		—		—		(222)		(222)
Distributions to Partners	—		(12,721)		—		—		(12,721)
Balance at June 30, 2021	127,195,219	$	1,206,511	$	(83,212)	$	11,221	$	1,134,520

				Accumulated
	Number of	Limited		Other
	Limited Partner	Partners'		Comprehensive		Noncontrolling		Total Partners'
	Units	Capital		Income (Loss)		Interest		Capital
	(in thousands, except unit data)
Balance at January 1, 2020	126,915,597	$	1,331,482	$	(77,993)	$	11,935	$	1,265,424
Comprehensive income (loss):
Net income (loss)	—		(144,783)		—		76		(144,707)
Actuarially determined long-term liability adjustments	—		—		938		—		938
Total comprehensive loss									(143,769)
Settlement of deferred compensation plans	279,622		(1,310)		—		—		(1,310)
Common unit-based compensation	—		(527)		—		—		(527)
Distributions on deferred common unit-based compensation	—		(986)		—		—		(986)
Distributions from consolidated company to noncontrolling interest	—		—		—		(288)		(288)
Distributions to Partners	—		(50,767)		—		—		(50,767)
Other	—		(273)		—		—		(273)
Balance at March 31, 2020	127,195,219		1,132,836		(77,055)		11,723		1,067,504
Comprehensive income (loss):
Net loss	—		(46,664)		—		(15)		(46,679)
Actuarially determined long-term liability adjustments	—		—		939		—		939
Total comprehensive loss									(45,740)
Common unit-based compensation	—		1,610		—		—		1,610
Distributions from consolidated company to noncontrolling interest	—		—		—		(222)		(222)
Balance at June 30, 2020	127,195,219	$	1,087,782	$	(76,116)	$	11,486	$	1,023,152

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11.REVENUE FROM CONTRACTS WITH CUSTOMERS

The following table illustrates the disaggregation of our revenues by type, including a reconciliation to our segment presentation as presented in Note 16 – Segment Information.

	Coal Operations				Royalties
	Illinois								Other and
	Basin		Appalachia		Oil & Gas		Coal		Corporate		Elimination		Consolidated
	(in thousands)
Three Months Ended June 30, 2021
Coal sales	$	210,157	$	115,817	$	—	$	—	$	—	$	—	$	325,974
Oil & gas royalties		—		—		17,114		—		—		—		17,114
Coal royalties		—		—		—		11,653		—		(11,653)		—
Transportation revenues		7,434		4,624		—		—		—		—		12,058
Other revenues		642		282		473		—		8,547		(2,647)		7,297
Total revenues	$	218,233	$	120,723	$	17,587	$	11,653	$	8,547	$	(14,300)	$	362,443
Three Months Ended June 30, 2020
Coal sales	$	134,160	$	102,126	$	—	$	—	$	—	$	—	$	236,286
Oil & gas royalties		—		—		7,786		—		—		—		7,786
Coal royalties		—		—		—		6,778		—		(6,778)		0
Transportation revenues		3,153		2,604		—		—		—		—		5,757
Other revenues		474		2,380		61		—		4,955		(2,497)		5,373
Total revenues	$	137,787	$	107,110	$	7,847	$	6,778	$	4,955	$	(9,275)	$	255,202
Six Months Ended June 30, 2021
Coal sales	$	392,798	$	220,663	$	—	$	—	$	—	$	—	$	613,461
Oil & gas royalties		—		—		31,113		—		—		—		31,113
Coal royalties		—		—		—		22,954		—		(22,954)		—
Transportation revenues		15,114		8,012		—		—		—		—		23,126
Other revenues		1,255		667		494		—		16,315		(5,366)		13,365
Total revenues	$	409,167	$	229,342	$	31,607	$	22,954	$	16,315	$	(28,320)	$	681,065
Six Months Ended June 30, 2020
Coal sales	$	333,258	$	217,665	$	—	$	—	$	—	$	—	$	550,923
Oil & gas royalties		—		—		22,025		—		—		—		22,025
Coal royalties		—		—		—		18,149		—		(18,149)		—
Transportation revenues		7,009		3,487		—		—		—		—		10,496
Other revenues		1,392		14,061		85		5		12,334		(5,356)		22,521
Total revenues	$	341,659	$	235,213	$	22,110	$	18,154	$	12,334	$	(23,505)	$	605,965

The following table illustrates the amount of our transaction price for all current coal supply contracts allocated to performance obligations that are unsatisfied or partially unsatisfied as of June 30, 2021 and disaggregated by segment and contract duration.

							2024 and
	2021		2022		2023		Thereafter		Total
	(in thousands)
Illinois Basin Coal Operations coal revenues	$	446,385	$	305,362	$	238,070	$	201,875	$	1,191,692
Appalachia Coal Operations coal revenues		218,512		183,520		17,880		10,080		429,992
Total coal revenues (1)	$	664,897	$	488,882	$	255,950	$	211,955	$	1,621,684

(1) Coal revenues generally consists of consolidated revenues excluding our Oil & Gas Royalties segment as well as intercompany revenues from our Coal Royalties segment.

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12.EARNINGS PER LIMITED PARTNER UNIT

We utilize the two-class method in calculating basic and diluted earnings per limited partner unit ("EPU").  Net income attributable to ARLP is allocated to limited partners and participating securities under deferred compensation plans, which include rights to nonforfeitable distributions or distribution equivalents.  Net losses attributable to ARLP are allocated to limited partners but not to participating securities.  Our participating securities are outstanding restricted unit awards under our Long-Term Incentive Plan ("LTIP") and phantom units in notional accounts under our Supplemental Executive Retirement Plan ("SERP") and the MGP Amended and Restated Deferred Compensation Plan for Directors ("Directors' Deferred Compensation Plan").

The following is a reconciliation of net income (loss) attributable to ARLP used for calculating basic and diluted earnings per unit and the weighted-average units used in computing EPU for the three and six months ended June 30, 2021 and 2020:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands, except per unit data)
Net income (loss) attributable to ARLP	$	44,035	$	(46,664)	$	68,783	$	(191,447)
Less:
Distributions to participating securities		(401)		—		(619)		—
Undistributed earnings attributable to participating securities		(825)		—		(934)		—
Net income (loss) attributable to ARLP available to limited partners	$	42,809	$	(46,664)	$	67,230	$	(191,447)
Weighted-average limited partner units outstanding – basic and diluted		127,195		127,195		127,195		127,134
Earnings per limited partner unit - basic and diluted (1)	$	0.34	$	(0.37)	$	0.53	$	(1.51)

(1) Diluted EPU gives effect to all potentially dilutive common units outstanding during the period using the treasury stock method. Diluted EPU excludes all potentially dilutive units calculated under the treasury stock method if their effect is anti-dilutive.  The combined total of LTIP, SERP and Directors' Deferred Compensation Plan units of 1,525 and 1,397 for the three and six months ended June 30, 2021, respectively, and 661 and 654 for the three and six months ended June 30, 2020, respectively, were considered anti-dilutive under the treasury stock method.

13.WORKERS' COMPENSATION AND PNEUMOCONIOSIS

The changes in the workers' compensation liability, including current and long-term liability balances, for each of the periods presented were as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Beginning balance	$	54,233	$	52,880	$	54,739	$	53,384
Accruals increase		1,565		192		3,237		1,940
Payments		(2,565)		(1,992)		(4,975)		(4,563)
Interest accretion		231		320		463		639
Valuation loss (gain) (1)		(1,405)		3,078		(1,405)		3,078
Ending balance	$	52,059	$	54,478	$	52,059	$	54,478

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(1) Our estimate of the liability for the present value of current workers′ compensation benefits is based on our actuarial calculations.  Our actuarial calculations are based on a blend of actuarial projection methods and numerous assumptions including claims development patterns, mortality, medical costs and interest rates.  The valuation gain in 2021 is due to an increase in the discount rate from 1.95% on December 31, 2020 to 2.34% on June 30, 2021. We conducted a mid-year 2020 review of our actuarial assumptions, which resulted in a valuation loss in 2020 due to unfavorable changes in claims development and a decrease in the discount rate from 2.81% on December 31, 2019 to 2.05% on June 30, 2020.

We limit our exposure to traumatic injury claims by purchasing a high deductible insurance policy that starts paying benefits after deductibles for a claim have been met.  The deductible level may vary by claim year.  Our workers' compensation liability above is presented on a gross basis and does not include our expected receivables on our insurance policy.  Our receivables for traumatic injury claims under this policy as of June 30, 2021 are $7.1 million and are included in Other long-term assets on our condensed consolidated balance sheet.

Certain of our mine operating entities are liable under state statutes and the Federal Coal Mine Health and Safety Act of 1969, as amended, to pay pneumoconiosis, or black lung, benefits to eligible employees and former employees and their dependents.  Components of the net periodic benefit cost for each of the periods presented are as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Service cost	$	989	$	883	$	2,020	$	1,761
Interest cost (1)		637		749		1,273		1,499
Net amortization (1)		1,043		(171)		2,086		(343)
Net periodic benefit cost	$	2,669	$	1,461	$	5,379	$	2,917

(1) Interest cost and net amortization are included in the Other expense line item within our condensed consolidated statements of income.

14.COMMON UNIT-BASED COMPENSATION PLANS

Long-Term Incentive Plan

We maintain the LTIP for certain employees and officers of MGP and its affiliates who perform services for us.  As part of our LTIP, unit awards of non-vested "phantom" or notional units, also referred to as "restricted units", may be granted which upon satisfaction of time and performance-based vesting requirements, entitle the LTIP participant to receive ARLP common units.  Certain awards may also contain a minimum-value guarantee payable in ARLP common units or cash that would be paid regardless of whether or not the awards vest, as long as service requirements are met.  Annual grant levels, vesting provisions and minimum-value guarantees of restricted units for designated participants are recommended by Mr. Craft, subject to review and approval of the compensation committee of the MGP board of directors (the "Compensation Committee").  Vesting of all restricted units outstanding is subject to the satisfaction of certain financial tests. If it is not probable the financial tests for a particular grant of restricted units will be met, any previously expensed amounts for that grant are reversed and no future expense will be recognized for that grant.  Assuming the financial tests are met, grants of restricted units issued to LTIP participants are generally expected to cliff vest on January 1st of the third year following issuance of the grants.  We expect to settle restricted unit grants by delivery of newly-issued ARLP common units, except for the portion of the grants that will satisfy employee tax withholding obligations of LTIP participants.  We account for forfeitures of non-vested LTIP restricted unit grants as they occur.  As provided under the distribution equivalent rights ("DERs") provisions of the LTIP and the terms of the LTIP restricted unit awards, all non-vested restricted units include contingent rights to receive quarterly distributions in cash or, at the discretion of the Compensation Committee, phantom units in lieu of cash credited to a bookkeeping account with value equal to the cash distributions we make to unitholders during the vesting period. If it is not probable the financial tests for a particular grant of restricted units will be met, any previously paid DER amounts for that grant are reversed from Partners’ Capital and recorded as compensation expense and any future DERs, for that grant, if any, will be recognized as compensation expense when paid.  

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A summary of non-vested LTIP grants as of and for the six months ended June 30, 2021 is as follows:

	Number of units	Weighted average grant date fair value per unit		Intrinsic value
				(in thousands)
Non-vested grants at January 1, 2021	1,430,489	$	5.02	$	6,409
Granted (1)	1,818,190		6.03
Forfeited	(8,152)		5.02
Non-vested grants at June 30, 2021	3,240,527		5.59		23,364

(1) 921,430 units and 896,760 units have a minimum-value guarantee of $2.53 and $3.79 per unit, respectively, regardless of whether or not the awards vest.

LTIP expense for grants of restricted units was $1.4 million and $1.6 million for the three months ended June 30, 2021 and 2020, respectively, and $2.1 million and $0.9 million for the six months ended June 30, 2021 and 2020, respectively.  LTIP expense for grants of restricted units for the six months ended June 30, 2020 includes the reversal of $4.8 million of cumulative previously recognized expense for the 2019 Grants, which were determined to be not probable of vesting, offset in part by related DERs for the 2019 Grants previously recorded to equity and then expensed.  

The total obligation associated with LTIP grants of restricted units as of June 30, 2021 was $3.5 million and is included in the partners' capital Limited partners-common unitholders line item in our condensed consolidated balance sheets.  As of June 30, 2021, there was $14.6 million in total unrecognized compensation expense related to the non-vested LTIP restricted unit grants that are expected to vest.  That expense is expected to be recognized over a weighted-average period of 2.1 years.

Supplemental Executive Retirement Plan and Directors' Deferred Compensation Plan

We utilize the SERP to provide deferred compensation benefits for certain officers and key employees. All allocations made to participants under the SERP are made in the form of "phantom" ARLP units and SERP distributions will be settled in the form of ARLP common units.  The SERP is administered by the Compensation Committee.  

Our directors participate in the Directors' Deferred Compensation Plan. Pursuant to the Directors' Deferred Compensation Plan, for amounts deferred either automatically or at the election of the director, a notional account is established and credited with notional common units of ARLP, described in the Directors' Deferred Compensation Plan as "phantom" units.  Distributions from the Directors' Deferred Compensation Plan will be settled in the form of ARLP common units.

For both the SERP and Directors' Deferred Compensation Plan, when quarterly cash distributions are made with respect to ARLP common units, an amount equal to such quarterly distribution is credited to each participant's notional account as additional phantom units.  All grants of phantom units under the SERP and Directors' Deferred Compensation Plan vest immediately.

A summary of SERP and Directors' Deferred Compensation Plan activity as of and for the six months ended June 30, 2021 is as follows:

	Number of units	Weighted average grant date fair value per unit		Intrinsic value
				(in thousands)
Phantom units outstanding as of January 1, 2021	760,630	$	22.04	$	3,408
Granted	12,942		5.99
Phantom units outstanding as of June 30, 2021	773,572		21.77		5,577

16

Total SERP and Directors' Deferred Compensation Plan expense was $0.1 million for the three months ended June 30, 2021 and 2020, and $0.2 million and $0.4 million for the six months ended June 30, 2021, and 2020, respectively.  As of June 30, 2021, the total obligation associated with the SERP and Directors' Deferred Compensation Plan was $16.8 million and is included in the partners' capital Limited partners-common unitholders line item in our condensed consolidated balance sheets.

15.COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS

Eligible employees at certain of our mining operations participate in a defined benefit plan (the "Pension Plan") that we sponsor.  The Pension Plan is currently closed to new applicants and participants in the Pension Plan are no longer receiving benefit accruals for service.  The benefit formula for the Pension Plan is a fixed dollar unit based on years of service.  Components of the net periodic benefit cost for each of the periods presented are as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Interest cost	$	860	$	1,054	$	1,720	$	2,108
Expected return on plan assets		(1,671)		(1,491)		(3,342)		(2,983)
Amortization of prior service cost		46		47		93		93
Amortization of net loss		1,142		1,063		2,283		2,127
Net periodic benefit cost (1)	$	377	$	673	$	754	$	1,345

(1) Net periodic benefit cost for the Pension Plan is included in the Other expense line item within our condensed consolidated statements of income.

During the six months ended June 30, 2021, we made contribution payments totaling $3.3 million to the Pension Plan for the 2020 plan year.  As a result of certain pension plan contribution relief provided by the American Rescue Plan Act enacted in March 2021, we do not expect to make additional contributions to the Pension Plan during 2021 or 2022.

16.SEGMENT INFORMATION

We operate in the United States as a diversified natural resource company that generates operating and royalty income from the production and marketing of coal to major domestic and international utilities and industrial users as well as royalty income from oil & gas mineral interests.  We aggregate multiple operating segments into four reportable segments, Illinois Basin Coal Operations, Appalachia Coal Operations, Oil & Gas Royalties and Coal Royalties.  We also have an "all other" category referred to as Other and Corporate.

Our two coal operations reportable segments correspond to major coal producing regions in the eastern United States with similar economic characteristics including coal quality, geology, coal marketing opportunities, mining and transportation methods and regulatory issues.  The two coal operations reportable segments include seven mining complexes operating in Illinois, Indiana, Kentucky, Maryland, Pennsylvania and West Virginia and a coal loading terminal in Indiana on the Ohio River.  Our Oil & Gas Royalties reportable segment includes our oil & gas mineral interests which are located primarily in the Permian (Delaware and Midland), Anadarko (SCOOP/STACK), and Williston (Bakken) basins. The operations within our Oil & Gas Royalties reportable segment primarily include receiving royalties and lease bonuses for our oil & gas mineral interests. Our Coal Royalties reportable segment includes coal reserves controlled by Alliance Resource Properties, which are either (a) leased to certain of our coal mining entities or (b) unleased but near our coal mining operations.

Beginning in the first quarter of 2021, we began to strategically view and manage our coal royalty activities separately from our coal mining operations since acquiring and managing a variety of royalty producing assets have similar management attributes.  As a result, we restructured our reportable segments to better reflect this strategic view in how we manage our business and allocate resources.  Prior periods have been recast to include Alliance Resource Properties within our new Coal Royalties reportable segment with offsetting recast adjustments primarily to our coal operations reportable segments and to a lesser extent, our Other and Corporate category.  Our reported eliminations were recast also to reflect intercompany royalty revenues and offsetting intercompany royalty expense resulting from our new Coal Royalties reportable segment.

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The Illinois Basin Coal Operations reportable segment includes currently operating mining complexes (a) the Gibson County Coal, LLC ("Gibson") mining complex, which includes the Gibson South mine, (b) the Warrior Coal, LLC ("Warrior") mining complex, (c) the River View Coal, LLC ("River View") mining complex and (d) the Hamilton mining complex. The Illinois Basin Coal Operations reportable segment also includes our currently operating Mt. Vernon Transfer Terminal, LLC ("Mt. Vernon") coal loading terminal in Indiana on the Ohio River.   Our Coal Royalties reportable segment discussed below, controls other coal reserves near our Illinois Basin operations which have not yet been leased to our Illinois Basin mining entities.

The Illinois Basin Coal Operations reportable segment also includes Mid-America Carbonates, LLC ("MAC") and other support services as well as non-operating mining complexes including (a) the Gibson North mine, which ceased production in the fourth quarter of 2019, (b) Webster County Coal, LLC's Dotiki mining complex, (c) White County Coal, LLC's Pattiki mining complex, (d) Hopkins County Coal, LLC's mining complex, and (e) Sebree Mining, LLC's mining complex.

The Appalachia Coal Operations reportable segment includes currently operating mining complexes (a) the Mettiki mining complex, (b) the Tunnel Ridge, LLC mining complex and (c) the MC Mining, LLC ("MC Mining") mining complex. The Mettiki mining complex includes Mettiki Coal (WV), LLC's Mountain View mine and Mettiki Coal, LLC's preparation plant. Our Coal Royalties reportable segment discussed below, controls the Penn Ridge coal reserves near our Tunnel Ridge operations which have not yet been leased to Tunnel Ridge.  

The Oil & Gas Royalties reportable segment includes oil & gas mineral interests held by AR Midland, LP and AllDale I & II and includes Alliance Minerals' equity interests in both AllDale III (Note 9 – Investment) and Cavalier Minerals.

The Coal Royalties reportable segment includes coal reserves controlled by Alliance Resource Properties, that are either (a) leased to certain of our mining complexes in both the Illinois Basin Coal Operations and Appalachia Coal Operations reportable segments or (b) near our coal mining operations but not yet leased to our coal mining entities. About two thirds of the coal sold by our Coal Operations' mines is leased from our Coal Royalties entities.

Other and Corporate includes marketing and administrative activities, Matrix Design Group, LLC and its subsidiaries ("Matrix Design"), Alliance Design Group, LLC ("Alliance Design") (collectively, Matrix Design and Alliance Design referred to as the "Matrix Group"), Pontiki Coal, LLC's workers' compensation and pneumoconiosis liabilities, Wildcat Insurance, LLC ("Wildcat Insurance"), which assists the ARLP Partnership with its insurance requirements, and AROP Funding and Alliance Finance (both discussed in Note 7 – Long-Term Debt).

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Reportable segment results are presented below.

	Coal Operations				Royalties
	Illinois								Other and		Elimination
	Basin		Appalachia		Oil & Gas		Coal		Corporate		(1)		Consolidated
	(in thousands)
Three Months Ended June 30, 2021
Revenues - Outside	$	218,233	$	120,723	$	17,587	$	—	$	5,900	$	—	$	362,443
Revenues - Intercompany		—		—		—		11,653		2,647		(14,300)		—
Total revenues (2)		218,233		120,723		17,587		11,653		8,547		(14,300)		362,443
Segment Adjusted EBITDA Expense (3)		140,176		74,456		2,419		4,871		4,825		(12,243)		214,504
Segment Adjusted EBITDA (4)		70,623		41,641		15,379		6,782		3,724		(2,057)		136,092
Capital expenditures		12,515		10,382		—		—		1,292		—		24,189
Three Months Ended June 30, 2020
Revenues - Outside	$	137,787	$	107,110	$	7,847	$	—	$	2,458	$	—	$	255,202
Revenues - Intercompany		—		—		—		6,778		2,497		(9,275)		—
Total revenues (2)		137,787		107,110		7,847		6,778		4,955		(9,275)		255,202
Segment Adjusted EBITDA Expense (3)		111,967		74,227		1,119		3,021		4,147		(6,940)		187,541
Segment Adjusted EBITDA (4)		22,667		30,279		6,881		3,757		807		(2,335)		62,056
Capital expenditures		14,029		19,686		—		—		166		—		33,881
Six Months Ended June 30, 2021
Revenues - Outside	$	409,167	$	229,342	$	31,607	$	—	$	10,949	$	—	$	681,065
Revenues - Intercompany		—		—		—		22,954		5,366		(28,320)		—
Total revenues (2)		409,167		229,342		31,607		22,954		16,315		(28,320)		681,065
Segment Adjusted EBITDA Expense (3)		265,757		148,182		4,477		8,899		9,111		(24,205)		412,221
Segment Adjusted EBITDA (4)		128,296		73,147		27,325		14,055		7,205		(4,115)		245,913
Total assets		726,555		425,574		604,355		292,134		489,271		(422,376)		2,115,513
Capital expenditures		28,916		22,048		—		—		4,662		—		55,626
Six Months Ended June 30, 2020
Revenues - Outside	$	341,659	$	235,213	$	22,110	$	5	$	6,978	$	—	$	605,965
Revenues - Intercompany		—		—		—		18,149		5,356		(23,505)		—
Total revenues (2)		341,659		235,213		22,110		18,154		12,334		(23,505)		605,965
Segment Adjusted EBITDA Expense (3)		268,650		154,145		2,002		7,488		8,789		(18,835)		422,239
Segment Adjusted EBITDA (4)		66,000		77,581		20,636		10,666		3,544		(4,670)		173,757
Total assets		814,972		492,073		628,308		294,435		473,119		(417,279)		2,285,628
Capital expenditures		40,258		43,257		—		—		730		—		84,245

(1) The elimination column represents the elimination of intercompany transactions and is primarily comprised of coal royalties paid by certain of our coal operation entities to Alliance Resource Properties, sales from the Matrix Group to our mining operations, coal sales and purchases between operations within different segments, sales of receivables to AROP Funding, financing between segments and insurance premiums paid to Wildcat Insurance.

(2) Revenues included in the Other and Corporate column are primarily attributable to the outside and affiliate revenues at the Matrix Group and coal brokerage activities.  In addition, Other and Corporate includes affiliate revenues from administrative and Wildcat Insurance revenues services.

(3) Segment Adjusted EBITDA Expense includes operating expenses, coal purchases and other income. Transportation expenses are excluded as transportation revenues are recognized in an amount equal to transportation expenses when title passes to the customer.  

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The following is a reconciliation of consolidated Segment Adjusted EBITDA Expense to Operating expenses (excluding depreciation, depletion and amortization):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Segment Adjusted EBITDA Expense	$	214,504	$	187,541	$	412,221	$	422,239
Outside coal purchases		(114)		—		(114)		—
Other expense		(1,351)		(377)		(2,548)		(733)
Operating expenses (excluding depreciation, depletion and amortization)	$	213,039	$	187,164	$	409,559	$	421,506

(4) Segment Adjusted EBITDA is defined as net income (loss) attributable to ARLP before net interest expense, income taxes, depreciation, depletion and amortization, general and administrative expenses and asset and goodwill impairments.  Management therefore is able to focus solely on the evaluation of segment operating profitability as it relates to our revenues and operating expenses, which are primarily controlled by our segments.  Consolidated Segment Adjusted EBITDA is reconciled to net income as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Consolidated Segment Adjusted EBITDA	$	136,092	$	62,056	$	245,913	$	173,757
General and administrative		(17,492)		(13,822)		(32,996)		(27,260)
Depreciation, depletion and amortization		(64,733)		(83,559)		(123,935)		(157,480)
Asset impairments		—		—		—		(24,977)
Goodwill impairment		—		—		—		(132,026)
Interest expense, net		(9,827)		(11,416)		(20,206)		(23,643)
Income tax (expense) benefit		(5)		77		7		182
Net income (loss) attributable to ARLP	$	44,035	$	(46,664)	$	68,783	$	(191,447)
Noncontrolling interest		130		(15)		208		61
Net income (loss)	$	44,165	$	(46,679)	$	68,991	$	(191,386)

17.SUBSEQUENT EVENTS

Other than the event described in Note 10, there were no subsequent events.

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ITEM 2.MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Significant relationships referenced in this management's discussion and analysis of financial condition and results of operations include the following:

● References to "we," "us," "our" or "ARLP Partnership" mean the business and operations of Alliance Resource Partners, L.P., the parent company, as well as its consolidated subsidiaries.

● References to "ARLP" mean Alliance Resource Partners, L.P., individually as the parent company, and not on a consolidated basis.

● References to "MGP" mean Alliance Resource Management GP, LLC, ARLP's general partner.  

● References to "Mr. Craft" mean Joseph W. Craft III, the Chairman, President and Chief Executive Officer of MGP.

● References to "Intermediate Partnership" mean Alliance Resource Operating Partners, L.P., the intermediate partnership of Alliance Resource Partners, L.P.

● References to "Alliance Coal" mean Alliance Coal, LLC, the holding company for our coal mining operations.

● References to "Alliance Minerals" mean Alliance Minerals, LLC, the holding company for our oil and gas minerals interests.

● References to "Alliance Resource Properties" mean Alliance Resource Properties, LLC, the land holding company for certain of our coal mineral interests, including the subsidiaries of Alliance Resource Properties, LLC.

Summary

We are a diversified natural resource company operating in the United States that generates operating and royalty income from the production and marketing of coal to major domestic and international utilities and industrial users as well as royalty income from oil & gas mineral interests.  We began coal mining operations in 1971 and, since then, have grown through acquisitions and internal development in strategic producing regions to become the second largest coal producer in the eastern United States.  Our mining operations are located near many of the major eastern utility generating plants and on major coal hauling railroads in the eastern United States.  Two of our mines are located on the banks of the Ohio River.   As is customary in the coal industry, we have entered into long-term coal supply agreements with many of our customers.  In addition to our mining operations, in 2007, Alliance Resource Properties began acquiring control of coal mineral interests and leasing the coal reserves to our mining operations.  In 2014, we began acquiring oil & gas mineral interests in premier oil & gas producing regions across the United States.  

We have four reportable segments, Illinois Basin Coal Operations, Appalachia Coal Operations, Oil & Gas Royalties and Coal Royalties.  We also have an "all other" category referred to as Other and Corporate.  Our two coal operations reportable segments correspond to major coal producing regions in the eastern United States with similar economic characteristics including coal quality, geology, coal marketing opportunities, mining and transportation methods and regulatory issues.  The two coal operations reportable segments include seven mining complexes operating in Illinois, Indiana, Kentucky, Maryland, Pennsylvania and West Virginia and a coal loading terminal in Indiana on the Ohio River.  Our Oil & Gas Royalties reportable segment includes our oil & gas mineral interests which are located primarily in the Permian (Delaware and Midland), Anadarko (SCOOP/STACK), and Williston (Bakken) basins. Our ownership in these basins includes approximately 55,500 net royalty acres which provides us with diversified exposure to industry leading operators consistent with our general business strategy to grow our oil & gas mineral interest business.  We market our oil & gas mineral interests for lease to operators in those regions and generate royalty income from the leasing and development of those mineral interests.  Our Coal Royalties reportable segment includes coal reserves controlled by Alliance Resource Properties, which are either (a) leased to certain of our coal mining entities or (b) unleased but near our coal mining operations.      

Beginning in the first quarter of 2021, we began to strategically view and manage our coal royalty activities separately from our coal operations since acquiring and managing a variety of royalty producing assets have similar management attributes.  As a result, we restructured our reportable segments to better reflect this strategic view in how we manage our business and allocate resources.  Prior periods have been recast to include Alliance Resource Properties within our new Coal Royalties reportable segment with offsetting recast adjustments primarily to our coal operations reportable segments and to a lesser extent, our Other and Corporate category.  Our reported eliminations were recast also to reflect

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intercompany royalty revenues and offsetting intercompany royalty expense resulting from our new Coal Royalties reportable segment.

● Illinois Basin Coal Operations reportable segment includes currently operating mining complexes (a) the Gibson County Coal, LLC ("Gibson") mining complex, which includes the Gibson South mine, (b) the Warrior Coal, LLC ("Warrior") mining complex, (c) the River View Coal, LLC ("River View") mining complex and (d) the Hamilton County Coal, LLC ("Hamilton") mining complex. The Illinois Basin Coal Operations reportable segment also includes our operating Mt. Vernon Transfer Terminal, LLC ("Mt. Vernon") coal loading terminal in Indiana on the Ohio River.   Our Coal Royalties reportable segment controls other coal reserves near our Illinois Basin operations, which have not yet been leased to our Illinois Basin mining entities.

The Illinois Basin Coal Operations reportable segment also includes Mid-America Carbonates, LLC ("MAC") and other support services as well as non-operating mining complexes (a) the Gibson North mine, which ceased production in fourth quarter of 2019, (b) Webster County Coal, LLC's Dotiki mining complex, (c) White County Coal, LLC's Pattiki mining complex, (d) Hopkins County Coal, LLC's mining complex, and (e) Sebree Mining, LLC's mining complex.

● Appalachia Coal Operations reportable segment includes currently operating mining complexes (a) the Mettiki mining complex ("Mettiki"), (b) the Tunnel Ridge, LLC mining complex ("Tunnel Ridge"), and (c) the MC Mining, LLC ("MC Mining") mining complex.  The Mettiki mining complex includes Mettiki Coal (WV), LLC's Mountain View mine and Mettiki Coal, LLC's preparation plant.  Our Coal Royalties reportable segment discussed below, controls the Penn Ridge coal reserves near our Tunnel Ridge operations which have not yet been leased to Tunnel Ridge.  

● Oil & Gas Royalties reportable segment includes oil & gas mineral interests held by AR Midland, LP ("AR Midland") and AllDale I & II and includes Alliance Minerals' equity interests in both AllDale Minerals III, LP ("AllDale III") (Note 9 – Investment) and Cavalier Minerals.  Please read "Item 1. Financial Statements (Unaudited)—Note 9 – Investment" of this Quarterly Report on Form 10-Q for more information on AllDale III.

● Coal Royalties reportable segment includes coal reserves held or controlled by Alliance Resource Properties, consisting of (a) reserves leased to certain of our mining complexes in both the Illinois Basin Coal Operations and Appalachia Coal Operations reportable segments and (b) reserves near our coal mining operations but not yet leased to our coal mining entities. About two thirds of the coal sold by our Coal Operations' mines is leased from our Coal Royalties entities.

● Other and Corporate includes marketing and administrative activities, Matrix Design Group, LLC and its subsidiaries ("Matrix Design"), Alliance Design Group, LLC ("Alliance Design") (collectively, Matrix Design and Alliance Design referred to as the "Matrix Group"), Pontiki Coal, LLC's workers' compensation and pneumoconiosis liabilities, Wildcat Insurance, LLC ("Wildcat Insurance"), which assists the ARLP Partnership with its insurance requirements, and AROP Funding and Alliance Finance (both discussed in Note 7 – Long-Term Debt).  Please read "Item 1. Financial Statements (Unaudited)—Note 7 – Long-Term Debt" of this Quarterly Report on Form 10-Q for more information on AROP Funding.

Three Months Ended June 30, 2021 Compared to Three Months Ended June 30, 2020

We reported net income attributable to ARLP of $44.0 million for the three months ended June 30, 2021 ("2021 Quarter") compared to a net loss attributable to ARLP of $46.7 million for the three months ended June 30, 2020 ("2020 Quarter").  The increase of $90.7 million was primarily due to higher revenues, partially offset by increased operating expenses.  Increased coal sales volumes and oil & gas prices drove total revenues higher in the 2021 Quarter by 42.0% to $362.4 million, compared to $255.2 million for the 2020 Quarter.  In general, the results from the 2021 Quarter benefited as compared to the 2020 Quarter, from significantly reduced disruptions to global energy demand created by the COVID-19 pandemic that negatively impacted our results for the 2020 Quarter.

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	Three Months Ended June 30,
	2021		2020		2021		2020
	(in thousands)				(per ton / per BOE sold)
Coal - Tons sold		7,846		5,186		N/A		N/A
Coal - Tons produced		7,481		4,323		N/A		N/A
Coal - Coal sales	$	325,974	$	236,286	$	41.55	$	45.56
Coal - Segment Adjusted EBITDA Expense (1) (2)	$	218,867	$	190,179	$	27.90	$	36.67
Oil & Gas Royalties - BOE sold		391		411		N/A		N/A
Oil & Gas Royalties – Royalties (3)	$	17,114	$	7,786	$	43.73	$	18.92
Coal Royalties - Tons sold		4,707		3,441		N/A		N/A
Coal Royalties - Intercompany royalties	$	11,653	$	6,778	$	2.48	$	1.97

(1) For a definition of Segment Adjusted EBITDA Expense and related reconciliation to comparable generally accepted accounting principles ("GAAP") financial measures, please see below under "—Reconciliation of non-GAAP "Segment Adjusted EBITDA Expense" to GAAP "Operating Expenses."

(2) Coal - Segment Adjusted EBITDA Expense is defined as consolidated Segment Adjusted EBITDA Expense excluding expenses of our Oil & Gas Royalties segment and is adjusted for intercompany transactions with our Coal Royalties segment.

(3) Average sales price per BOE is defined as oil & gas royalty revenues excluding lease bonus revenue divided by total BOE sold.

Coal sales.  Coal sales increased $89.7 million or 38.0% to $326.0 million for the 2021 Quarter from $236.3 million for the 2020 Quarter.  The increase was attributable to a volume variance of $121.2 million resulting from increased tons sold, partially offset by a price variance of $31.5 million due to lower average coal sales prices.  Improved domestic and international coal demand during the 2021 Quarter drove coal sales volumes higher by 51.3% to 7.8 million tons sold compared to 5.2 million tons sold in the 2020 Quarter, which was adversely impacted by the pandemic.  Contributing to the increase for the 2021 Quarter was the shipment of tons delayed in the three months ended March 31, 2021 due to weather-related transportation disruptions and an unplanned customer outage.  Coal sales price realizations decreased by 8.8% in the 2021 Quarter to $41.55 per ton sold, compared to $45.56 per ton sold during the 2020 Quarter, due to the expiration of higher priced contract shipments. Production volumes increased by 73.1% in the 2021 Quarter, reflecting the temporary idling of production at certain mines during the 2020 Quarter in response to weak market conditions resulting from the pandemic.

Coal - Segment Adjusted EBITDA Expense.  Segment Adjusted EBITDA Expense for our coal operations increased 15.1% to $218.9 million, as a result of higher coal sales volumes.  On a per ton basis, Segment Adjusted EBITDA Expense for our coal operations decreased 23.9% in the 2021 Quarter to $27.90 per ton sold, compared to $36.67 per ton in the 2020 Quarter, primarily due to increased volumes, lower inventory charges, improved recoveries at several mines and the benefit of ongoing expense control and efficiency initiatives at all of our mining operations. In addition, other cost decreases are discussed below by category:

● Labor and benefit expenses per ton produced, excluding workers' compensation, decreased 24.2% to $9.35 per ton in the 2021 Quarter from $12.33 per ton in the 2020 Quarter.  The decrease of $2.98 per ton was primarily due to increased volumes at our Illinois Basin mines where production was temporarily idled in the 2020 Quarter in response to weak market conditions resulting from the pandemic.

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● Workers' compensation expenses per ton produced decreased to $0.24 per ton in the 2021 Quarter from $1.33 per ton in the 2020 Quarter.  The decrease of $1.09 per ton produced resulted from favorable mid-year workers' compensation accrual adjustments in the 2021 Quarter, primarily due to an increase in the discount rate, compared to the 2020 Quarter, which had a valuation loss due to unfavorable changes in claims development and a decrease in the discount rate.

● Material and supplies expenses per ton produced decreased 19.3% to $9.17 per ton in the 2021 Quarter from $11.36 per ton in the 2020 Quarter.  The decrease of $2.19 per ton produced reflects decreases of $1.06 per ton for outside expenses used in the mining processes, $0.91 per ton for power and fuel used in the mining process, $0.61 per ton for environmental and reclamation expenses other than longwall subsidence and $0.27 per ton in longwall subsidence expense primarily at our Tunnel Ridge operation, partially offset by increases of $1.02 per ton for roof support and $0.25 per ton for contract labor used in the mining process.

● Maintenance expenses per ton produced decreased 18.6% to $2.59 per ton in the 2021 Quarter from $3.18 per ton in the 2020 Quarter.  The decrease of $0.59 per ton produced was primarily due to increased production and improved recoveries previously mentioned.

● Production taxes and royalty expenses per ton incurred as a percentage of coal sales prices and volumes decreased $0.56 per produced ton sold in the 2021 Quarter compared to the 2020 Quarter primarily as a result of lower coal sales prices and a favorable state tons sold mix decreasing severance taxes per ton, in addition to decreased excise taxes per ton resulting from a greater mix of export shipments.  

Oil & gas royalties.  Oil & gas royalty revenues increased to $17.1 million in the 2021 Quarter compared to $7.8 million for the 2020 Quarter.  The increase of $9.3 million was primarily due to significantly higher sales price realizations per BOE.

Depreciation, depletion and amortization.  Depreciation, depletion and amortization expense decreased to $64.7 million for the 2021 Quarter compared to $83.6 million for the 2020 Quarter primarily as a result of increased mine life estimates for certain mines and reduced depreciation associated with coal inventory changes.

Transportation revenues and expenses.  Transportation revenues and expenses were $12.1 million and $5.8 million for the 2021 and 2020 Quarters, respectively.  The increase of $6.3 million was primarily attributable to increased average third-party transportation rates in the 2021 Quarter and increased coal tonnage for which we arrange third-party transportation at certain mines primarily due to increased coal shipments to international markets.  Transportation revenues are recognized when title to the coal passes to the customer and recognized in an amount equal to the corresponding transportation expenses.

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Segment Adjusted EBITDA.  Our 2021 Quarter Segment Adjusted EBITDA increased $74.0 million to $136.1 million from the 2020 Quarter Segment Adjusted EBITDA of $62.1 million.  Segment Adjusted EBITDA, tons sold, coal sales, other revenues, oil & gas royalties, BOE volume, coal royalties, coal royalties tons sold and Segment Adjusted EBITDA Expense by segment are as follows:

	Three Months Ended
	June 30,
	2021		2020		Increase (Decrease)
	(in thousands)
Segment Adjusted EBITDA
Illinois Basin Coal Operations	$	70,623	$	22,667	$	47,956	211.6	%
Appalachia Coal Operations		41,641		30,279		11,362	37.5	%
Oil & Gas Royalties		15,379		6,881		8,498	123.5	%
Coal Royalties		6,782		3,757		3,025	80.5	%
Other and Corporate		3,724		807		2,917	(1)
Elimination		(2,057)		(2,335)		278	11.9	%
Total Segment Adjusted EBITDA (2)	$	136,092	$	62,056	$	74,036	119.3	%
Coal - Tons sold
Illinois Basin Coal Operations		5,425		3,350		2,075	61.9	%
Appalachia Coal Operations		2,421		1,836		585	31.9	%
Total tons sold		7,846		5,186		2,660	51.3	%
Coal sales
Illinois Basin Coal Operations	$	210,157	$	134,160	$	75,997	56.6	%
Appalachia Coal Operations		115,817		102,126		13,691	13.4	%
Total coal sales	$	325,974	$	236,286	$	89,688	38.0	%
Other revenues
Illinois Basin Coal Operations	$	642	$	474	$	168	35.4	%
Appalachia Coal Operations		282		2,380		(2,098)	(88.2)	%
Oil & Gas Royalties		473		61		412	(1)
Other and Corporate		8,547		4,955		3,592	72.5	%
Elimination		(2,647)		(2,497)		(150)	(6.0)	%
Total other revenues	$	7,297	$	5,373	$	1,924	35.8	%
Segment Adjusted EBITDA Expense
Illinois Basin Coal Operations	$	140,176	$	111,967	$	28,209	25.2	%
Appalachia Coal Operations		74,456		74,227		229	0.3	%
Oil & Gas Royalties		2,419		1,119		1,300	116.2	%
Coal Royalties		4,871		3,021		1,850	61.2	%
Other and Corporate		4,825		4,147		678	16.3	%
Elimination (3)		(12,243)		(6,940)		(5,303)	(76.4)	%
Total Segment Adjusted EBITDA Expense	$	214,504	$	187,541	$	26,963	14.4	%
Oil & Gas Royalties
Volume - BOE (4)		391		411		(20)	(4.9)	%
Oil & gas royalties	$	17,114	$	7,786	$	9,328	119.8	%
Coal Royalties
Volume - Tons sold (5)		4,707		3,441		1,266	36.8	%
Intercompany coal royalties	$	11,653	$	6,778	$	4,875	71.9	%

(1) Percentage change not meaningful.

(2) For a definition of Segment Adjusted EBITDA and related reconciliation to comparable GAAP financial measures, please see below under "—Reconciliation of non-GAAP "Segment Adjusted EBITDA" to GAAP "net income (loss)."  

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(3) Primarily includes the elimination of intercompany coal royalty revenues and expenses between our Coal Royalties Segment and our Coal Operations Segments.

(4) Barrels of oil equivalent ("BOE") is calculated on a 6:1 basis (6,000 cubic feet of natural gas to one barrel).

(5) Represents tons sold by our Coal Operations Segments associated with coal reserves leased from our Coal Royalties Segment.

Illinois Basin Coal Operations – Segment Adjusted EBITDA increased to $70.6 million in the 2021 Quarter from $22.7 million in the 2020 Quarter.  The increase of $47.9 million was primarily attributable to higher coal sales, which increased 56.6% to $210.2 million in the 2021 Quarter from $134.2 million in the 2020 Quarter, partially offset by increased operating expenses. The increase of $76.0 million in coal sales primarily reflects increased sales volumes, which rose 61.9% compared to the 2020 Quarter due to improved coal demand and increased export volumes reflecting the continued economic recovery from the COVID-19 pandemic.  Segment Adjusted EBITDA Expense increased 25.2% to $140.2 million in the 2021 Quarter from $112.0 million in the 2020 Quarter primarily as a result of increased sales volumes.  Segment Adjusted EBITDA Expense per ton decreased $7.58 per ton sold to $25.84 from $33.42 per ton sold in the 2020 Quarter primarily as a result of increased volumes at all of our Illinois Basin mines reflecting the temporary idling and scaling back of Illinois Basin operations in the 2020 Quarter in response to weak market conditions resulting from the pandemic offset in part by increased longwall move days at our Hamilton mine.  Lower inventory charges, the impact of ongoing expense control and efficiency initiatives at all of our mining operations in the region and improved recoveries at our Hamilton mine also contributed to the expense decrease.  In addition, see certain cost variances described above under "–Coal - Segment Adjusted EBITDA Expense" and particularly related to expense decreases associated with workers compensation expense.

Appalachia Coal Operations – Segment Adjusted EBITDA increased 37.5% to $41.6 million for the 2021 Quarter from $30.3 million in the 2020 Quarter.  The increase of $11.3 million was primarily attributable to higher coal sales, which increased 13.4% to $115.8 million in the 2021 Quarter from $102.1 million in the 2020 Quarter.  The increase in coal sales reflects higher tons sold, partially offset by lower price realizations.  Tons sold increased 31.9% in the 2021 Quarter compared to the 2020 Quarter due to increased sales volumes at our Tunnel Ridge and MC Mining operations resulting from improved market conditions.  Coal sales price per ton sold in the 2021 Quarter decreased 14.0% compared to the 2020 Quarter primarily due to the expiration of higher priced contract shipments at our Tunnel Ridge and MC Mining mines and reduced export shipments of higher priced metallurgical coal from our Mettiki mine.  Segment Adjusted EBITDA Expense remained comparable to the 2020 Quarter as reduced per ton costs in the 2021 Quarter offset increased expenses resulting from higher sales volumes in the 2021 Quarter.  Segment Adjusted EBITDA Expense per ton decreased $9.68 per ton sold to $30.75 compared to $40.43 per ton sold in the 2020 Quarter, as a result of increased sales volumes, favorable inventory charges, ongoing expense control and efficiency initiatives and improved recoveries across the region, partially offset by reduced longwall shifts at our Mettiki mine, and increased longwall move days and certain operational transition issues with new longwall equipment both at our Tunnel Ridge mine in the 2021 Quarter.  See also certain cost variances described above under "–Coal - Segment Adjusted EBITDA Expense" and particularly related to expense per ton decreases associated with selling expenses.

Oil & Gas Royalties – Segment Adjusted EBITDA increased to $15.4 million for the 2021 Quarter from $6.9 million in the 2020 Quarter.  The increase of $8.5 million was primarily due to significantly higher sales price realizations per BOE, which more than offset lower BOE volumes.

Coal Royalties – Segment Adjusted EBITDA increased 80.5% to $6.8 million for the 2021 Quarter from $3.8 million in the 2020 Quarter.  The increase of $3.0 million was a result of increased royalty tons sold and higher average royalty rates per ton received from our mining subsidiaries, partially offset by increased selling expenses.

Six Months Ended June 30, 2021 Compared to Six Months Ended June 30, 2020

We reported net income attributable to ARLP of $68.8 million for the six months ended June 30, 2021 ("2021 Period") compared to a net loss attributable to ARLP of $191.4 million for the six months ended June 30, 2020 ("2020 Period").  The increase of $260.2 million resulted from higher revenues, reduced operating expenses, lower depreciation and $157.0 million of non-cash impairment charges in the 2020 Period.  Coal sales volumes increased 18.0% compared to the 2020 Period driving total revenues higher by 12.4%.  Ongoing cost control and efficiency initiatives at our mining operations, offset in part by expense increases resulting from higher coal sales volumes, contributed to lower operating expenses of $409.6 million for the 2021 Period, compared to $421.5 million for the 2020 Period.  In general, results for

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the 2021 Period were significantly improved compared to the 2020 Period, which was impacted by reduced global energy demand and weak commodity prices as a result of lockdown measures imposed in response to the COVID-19 pandemic.

	Six Months Ended June 30,
	2021		2020		2021		2020
	(in thousands)				(per ton / per BOE sold)
Coal - Tons sold		14,674		12,437		N/A		N/A
Coal - Tons produced		15,482		12,344		N/A		N/A
Coal - Coal sales	$	613,461	$	550,923	$	41.81	$	44.30
Coal - Segment Adjusted EBITDA Expense (1) (2)	$	421,799	$	430,898	$	28.74	$	34.65
Oil & Gas Royalties - BOE sold		791		906		N/A		N/A
Oil & Gas Royalties – Royalties (3)	$	31,113	$	22,025	$	39.33	$	24.31
Coal Royalties - Tons sold		9,228		8,439		N/A		N/A
Coal Royalties - Intercompany royalties	$	22,954	$	18,149	$	2.49	$	2.15

(1) For a definition of Segment Adjusted EBITDA Expense and related reconciliation to comparable generally accepted accounting principles ("GAAP") financial measures, please see below under "—Reconciliation of non-GAAP "Segment Adjusted EBITDA Expense" to GAAP "Operating Expenses."

(2) Coal - Segment Adjusted EBITDA Expense is defined as consolidated Segment Adjusted EBITDA Expense excluding expenses of our Oil & Gas Royalties segment and is adjusted for intercompany transactions with our Coal Royalties segment.

(3) Average sales price per BOE is defined as oil & gas royalty revenues excluding lease bonus revenue divided by total BOE sold.

Coal sales.  Coal sales increased $62.6 million or 11.4% to $613.5 million for the 2021 Period from $550.9 million for the 2020 Period.  The increase was attributable to a volume variance of $99.1 million resulting from increased tons sold partially offset by a price variance of $36.5 million due to lower average coal sales prices.  Tons sold increased 18.0% to 14.7 million tons in the 2021 Period due to improved coal demand and increased export shipments.  Primarily due to the expiration of higher priced contract shipments, coal sales price realizations declined 5.6% in the 2021 Period to $41.81 per ton sold, compared to $44.30 per ton sold during the 2020 Period.  Production volumes increased by 25.4% in the 2021 Period, reflecting the temporary idling and scaling back of production at certain mines during the 2020 Period in response to weak market conditions resulting from the pandemic.

Coal - Segment Adjusted EBITDA Expense.  Segment Adjusted EBITDA Expense for our coal operations decreased 2.1% to $421.8 million, primarily as a result of reduced costs per ton, partially offset by increased expenses associated with higher coal sales volumes.  Segment Adjusted EBITDA Expense per ton decreased 17.1% in the 2021 Period to $28.74 per ton, compared to $34.65 per ton in the 2020 Period. The decrease was attributed primarily to increased volumes, lower inventory charges, improved recoveries at several mines and the impact of ongoing expense control and efficiency initiatives at all of our mining operations in addition to other cost decreases which are discussed below by category:

● Labor and benefit expenses per ton produced, excluding workers' compensation, decreased 17.5% to $9.39 per ton in the 2021 Period from $11.38 per ton in the 2020 Period.  The decrease of $1.99 per ton was primarily due to increased volumes at our Illinois Basin mines where production was temporarily idled in the 2020 Period in response to weak market conditions resulting from the pandemic.

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● Workers' compensation expenses per ton produced decreased to $0.32 per ton in the 2021 Period from $0.74 per ton in the 2020 Period.  The decrease of $0.42 per ton produced resulted from favorable mid-year workers' compensation accrual adjustments in the 2021 Period, primarily due to an increase in the discount rate, compared to the 2020 Period, which had a valuation loss due to unfavorable changes in claims development and a decrease in the discount rate.  

● Material and supplies expenses per ton produced decreased 13.7% to $9.57 per ton in the 2021 Period from $11.09 per ton in the 2020 Period.  The decrease of $1.52 per ton produced reflects decreases of $0.73 per ton for outside expenses used in the mining processes, $0.43 per ton for power and fuel used in the mining process and $0.35 per ton for environmental and reclamation expenses other than longwall subsidence, partially offset by an increase of $0.38 per ton for roof support.

● Maintenance expenses per ton produced decreased 26.1% to $2.57 per ton in the 2021 Period from $3.48 per ton in the 2020 Period.  The decrease of $0.91 per ton produced was primarily due to increased production and improved recoveries previously mentioned.

Oil & gas royalties.  Oil & gas royalty revenues increased to $31.1 million in the 2021 Period compared to $22.0 million for the 2020 Period.  The increase of $9.1 million was primarily due to significantly higher sales price realizations per BOE.

Other revenues.  Other revenues were principally comprised of Mt. Vernon transloading revenues in our Illinois Basin Coal Operations segment, Matrix Design sales in Other & Corporate as well as revenues not specific to any particular segment such as contract buy-out revenues and other outside services.  Other revenues decreased to $13.4 million in the 2021 Period from $22.5 million in the 2020 Period.  The decrease of $9.1 million was primarily due to a customer buy-out of certain coal contracts at our Tunnel Ridge mine during the 2020 Period.

Depreciation, depletion and amortization.  Depreciation, depletion and amortization expense decreased to $123.9 million for the 2021 Period compared to $157.5 million for the 2020 Period primarily as a result of increased mine life estimates for certain mines and reduced depreciation associated with a) coal inventory changes, b) certain mines closed prior to 2021 and c) lower BOE volumes.

Asset impairment.  During the 2020 Period, we recorded $25.0 million of non-cash asset impairment charges due to sealing our idled Gibson North mine, resulting in its permanent closure, and a decrease in the fair value of certain mining equipment and greenfield coal reserves as a result of weakened coal market conditions.  Please read "Item 1. Financial Statements (Unaudited)—Note 2 – Long-Lived Asset Impairments" of this Quarterly Report on Form 10-Q.

Goodwill impairment.  During the 2020 Period, we recorded a $132.0 million non-cash goodwill impairment charge associated with our Hamilton mine, primarily as the result of reduced expected production volumes due to weakened coal market conditions and low energy demand resulting in part from the COVID-19 pandemic.  Please read "Item 1. Financial Statements (Unaudited)—Note 3 – Goodwill Impairment " of this Quarterly Report on Form 10-Q.  

Transportation revenues and expenses.  Transportation revenues and expenses were $23.1 million and $10.5 million for the 2021 and 2020 Periods, respectively.  The increase of $12.6 million was primarily attributable to increased average third-party transportation rates in the 2021 Period and increased coal tonnage for which we arrange third-party transportation at certain mines primarily due to increased coal shipments to international markets.  Transportation revenues are recognized when title to the coal passes to the customer and recognized in an amount equal to the corresponding transportation expenses.

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Segment Adjusted EBITDA.  Our 2021 Period Segment Adjusted EBITDA increased $72.1 million, or 41.5%, to $245.9 million from the 2020 Period Segment Adjusted EBITDA of $173.8 million.  Segment Adjusted EBITDA, tons sold, coal sales, other revenues, oil & gas royalties, BOE volume, coal royalties, coal royalties tons sold and Segment Adjusted EBITDA Expense by segment are as follows:

	Six Months Ended
	June 30,
	2021		2020		Increase (Decrease)
	(in thousands)
Segment Adjusted EBITDA
Illinois Basin Coal Operations	$	128,296	$	66,000	$	62,296	94.4	%
Appalachia Coal Operations		73,147		77,581		(4,434)	(5.7)	%
Oil & Gas Royalties		27,325		20,636		6,689	32.4	%
Coal Royalties		14,055		10,666		3,389	31.8	%
Other and Corporate		7,205		3,544		3,661	103.3	%
Elimination		(4,115)		(4,670)		555	11.9	%
Total Segment Adjusted EBITDA (2)	$	245,913	$	173,757	$	72,156	41.5	%
Coal - Tons sold
Illinois Basin Coal Operations		10,185		8,406		1,779	21.2	%
Appalachia Coal Operations		4,489		4,031		458	11.4	%
Total tons sold		14,674		12,437		2,237	18.0	%
Coal sales
Illinois Basin Coal Operations	$	392,798	$	333,258	$	59,540	17.9	%
Appalachia Coal Operations		220,663		217,665		2,998	1.4	%
Total coal sales	$	613,461	$	550,923	$	62,538	11.4	%
Other revenues
Illinois Basin Coal Operations	$	1,255	$	1,392	$	(137)	(9.8)	%
Appalachia Coal Operations		667		14,061		(13,394)	(95.3)	%
Oil & Gas Royalties		494		85		409	(1)
Coal Royalties		—		5		(5)	(100.0)	%
Other and Corporate		16,315		12,334		3,981	32.3	%
Elimination		(5,366)		(5,356)		(10)	(0.2)	%
Total other revenues	$	13,365	$	22,521	$	(9,156)	(40.7)	%
Segment Adjusted EBITDA Expense
Illinois Basin Coal Operations	$	265,757	$	268,650	$	(2,893)	(1.1)	%
Appalachia Coal Operations		148,182		154,145		(5,963)	(3.9)	%
Oil & Gas Royalties		4,477		2,002		2,475	123.6	%
Coal Royalties		8,899		7,488		1,411	18.8	%
Other and Corporate		9,111		8,789		322	3.7	%
Elimination (3)		(24,205)		(18,835)		(5,370)	(28.5)	%
Total Segment Adjusted EBITDA Expense	$	412,221	$	422,239	$	(10,018)	(2.4)	%
Oil & Gas Royalties
Volume - BOE (4)		791		906		(115)	(12.7)	%
Oil & gas royalties	$	31,113	$	22,025	$	9,088	41.3	%
Coal Royalties
Volume - Tons sold (5)		9,228		8,439		789	9.3	%
Intercompany coal royalties	$	22,954	$	18,149	$	4,805	26.5	%

(1) Percentage change not meaningful.

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(2) For a definition of Segment Adjusted EBITDA and related reconciliation to comparable GAAP financial measures, please see below under "—Reconciliation of non-GAAP "Segment Adjusted EBITDA" to GAAP "net income (loss)."  

(3) Primarily includes the elimination of intercompany coal royalty revenues and expenses between our Coal Royalties Segment and our Coal Operations Segments.

(4) Barrels of oil equivalent ("BOE") is calculated on a 6:1 basis (6,000 cubic feet of natural gas to one barrel).

(5) Represents tons sold by our Coal Operations Segments associated with coal reserves leased from our Coal Royalties Segment.

Illinois Basin Coal Operations – Segment Adjusted EBITDA increased 94.4% to $128.3 million in the 2021 Period from $66.0 million in the 2020 Period.  The increase of $62.3 million was primarily attributable to higher coal sales, which increased 17.9% to $392.8 million in the 2021 Period from $333.3 million in the 2020 Period. The increase of $59.5 million in coal sales primarily reflects increased sales volumes, which rose 21.2% compared to the 2020 Period due to improved coal demand and increased export volumes reflecting the continued economic recovery from the COVID-19 pandemic.  Ongoing cost control and efficiency initiatives, offset in part by expense increases resulting from higher coal sales volumes, contributed to slightly lower Segment Adjusted EBITDA Expense in the 2021 Period compared to the 2020 Period.  Segment Adjusted EBITDA Expense per ton decreased 18.4% to $26.09 from $31.96 per ton sold in the 2020 Period primarily as a result of increased volumes where production was temporarily idled and scaled back in the 2020 Period in response to weak market conditions resulting from the pandemic.  Lower inventory charges and the impact of ongoing expense control and efficiency initiatives at all of our mining operations in the region also contributed to the decrease.  See also certain cost variances described above under "–Coal - Segment Adjusted EBITDA Expense."

Appalachia Coal Operations – Segment Adjusted EBITDA decreased 5.7% to $73.1 million for the 2021 Period from $77.6 million in the 2020 Period.  The decrease of $4.5 million was primarily attributable to lower contract buy-out revenues at Tunnel Ridge as discussed above, partially offset by reduced operating expenses and higher coal sales.  Coal sales increased slightly to $220.7 million in the 2021 Period compared to $217.7 million in the 2020 Period as a result of increased sales volumes, partially offset by lower price realizations.  Tons sold increased 11.4% in the 2021 Period compared to the 2020 Period due to increased sales volumes at our Tunnel Ridge and MC Mining operations resulting from improved market conditions.  Coal sales price per ton sold in the 2021 Period decreased 9.0% compared to the 2020 Period primarily due to the expiration of higher priced contract shipments and reduced export shipments of higher priced metallurgical coal from our Mettiki mine.  Segment Adjusted EBITDA Expense decreased to $148.2 million in the 2021 Period from $154.1 million in the 2020 Period due to decreased per ton costs, partially offset by increased volumes.  Segment Adjusted EBITDA Expense per ton decreased $5.23 per ton sold to $33.01 compared to $38.24 per ton sold in the 2020 Period, as a result of increased sales volumes, ongoing expense control and efficiency initiatives and improved recoveries across the region.  See also certain cost variances described above under "–Coal - Segment Adjusted EBITDA Expense."

Oil & Gas Royalties – Segment Adjusted EBITDA increased 32.4% to $27.3 million for the 2021 Period from $20.6 million in the 2020 Period.  The increase of $6.7 million was primarily due to significantly higher sales price realizations per BOE, which more than offset lower volumes.

Coal Royalties – Segment Adjusted EBITDA increased 31.8% to $14.1 million for the 2021 Period from $10.7 million in the 2020 Period.  The increase of $3.4 million was a result of increased royalty tons sold and higher average royalty rates per ton received from our mining subsidiaries, partially offset by increased selling expenses.

Reconciliation of non-GAAP "Segment Adjusted EBITDA" to GAAP "net income (loss)" and reconciliation of non-GAAP "Segment Adjusted EBITDA Expense" to GAAP "Operating Expenses"

Segment Adjusted EBITDA (a non-GAAP financial measure) is defined as net income (loss) attributable to ARLP before net interest expense, income taxes, depreciation, depletion and amortization, general and administrative expenses and asset and goodwill impairments.  Segment Adjusted EBITDA is a key component of consolidated EBITDA, which is used as a supplemental financial measure by management and by external users of our financial statements such as investors, commercial banks, research analysts and others.  We believe that the presentation of EBITDA provides useful information to investors regarding our performance and results of operations because EBITDA, when used in conjunction with related GAAP financial measures, (i) provides additional information about our core operating performance and ability to generate and distribute cash flow, (ii) provides investors with the financial analytical framework upon which we base financial, operational, compensation and planning decisions and (iii) presents a measurement that investors, rating agencies and debt holders have indicated is useful in assessing us and our results of operations.

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Segment Adjusted EBITDA is also used as a supplemental financial measure by our management for reasons similar to those stated in the previous explanation of EBITDA.  In addition, the exclusion of corporate general and administrative expenses from consolidated Segment Adjusted EBITDA allows management to focus solely on the evaluation of segment operating profitability as it relates to our revenues and operating expenses, which are primarily controlled by our segments.  

The following is a reconciliation of consolidated Segment Adjusted EBITDA to net income (loss), the most comparable GAAP financial measure:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Consolidated Segment Adjusted EBITDA	$	136,092	$	62,056	$	245,913	$	173,757
General and administrative		(17,492)		(13,822)		(32,996)		(27,260)
Depreciation, depletion and amortization		(64,733)		(83,559)		(123,935)		(157,480)
Asset impairments		—		—		—		(24,977)
Goodwill impairment		—		—		—		(132,026)
Interest expense, net		(9,827)		(11,416)		(20,206)		(23,643)
Income tax (expense) benefit		(5)		77		7		182
Net income (loss) attributable to ARLP	$	44,035	$	(46,664)	$	68,783	$	(191,447)
Noncontrolling interest		130		(15)		208		61
Net income (loss)	$	44,165	$	(46,679)	$	68,991	$	(191,386)

Segment Adjusted EBITDA Expense (a non-GAAP financial measure) includes operating expenses, coal purchases and other expense.  Transportation expenses are excluded as these expenses are passed through to our customers and, consequently, we do not realize any gain or loss on transportation revenues.  Segment Adjusted EBITDA Expense is used as a supplemental financial measure by our management to assess the operating performance of our segments.  Segment Adjusted EBITDA Expense is a key component of Segment Adjusted EBITDA in addition to coal sales, royalty revenues and other revenues.  The exclusion of corporate general and administrative expenses from Segment Adjusted EBITDA Expense allows management to focus solely on the evaluation of segment operating performance as it primarily relates to our operating expenses.  

The following is a reconciliation of consolidated Segment Adjusted EBITDA Expense to operating expense, the most comparable GAAP financial measure:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Segment Adjusted EBITDA Expense	$	214,504	$	187,541	$	412,221	$	422,239
Outside coal purchases		(114)		—		(114)		—
Other expense		(1,351)		(377)		(2,548)		(733)
Operating expenses (excluding depreciation, depletion and amortization)	$	213,039	$	187,164	$	409,559	$	421,506

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Liquidity and Capital Resources

Liquidity

We have historically satisfied our working capital requirements and funded our capital expenditures, investments and debt service obligations with cash generated from operations, cash provided by the issuance of debt or equity, borrowings under credit and securitization facilities and other financing transactions.  We believe that existing cash balances, future cash flows from operations and investments, borrowings under credit facilities and cash provided from the issuance of debt or equity will be sufficient to meet our working capital requirements, capital expenditures and additional investments, debt payments, commitments and any distribution payments.  Nevertheless, our ability to satisfy our working capital requirements, to fund planned capital expenditures, to service our debt obligations or to pay distributions will depend upon our future operating performance and access to and cost of financing sources, which will be affected by prevailing economic conditions generally, and in both the coal and oil & gas industries specifically, as well as other financial and business factors, some of which are beyond our control, including the COVID-19 pandemic.  Based on our recent operating cash flow results, current cash position, anticipated future cash flows and sources of financing that we expect to have available, we anticipate remaining in compliance with the covenants of the Credit Agreement and expect to have sufficient liquidity to fund our operations and growth strategies.  However, to the extent operating cash flow or access to and cost of financing sources are materially different than expected, future covenant compliance or liquidity may be adversely affected.  Please read "Item 1A. Risk Factors" in our Annual Report on Form 10-K for the year ended December 31, 2020.

In May 2018, the Board approved the establishment of a unit repurchase program authorizing us to repurchase up to $100 million of ARLP common units.  The program has no time limit and we may repurchase units from time to time in the open market or in other privately negotiated transactions.  The unit repurchase program authorization does not obligate us to repurchase any dollar amount or number of units.  Since inception through June 30, 2021, we have purchased units for a total of $93.5 million under the program.  During the six months ended June 30, 2021, we did not repurchase and retire any units. The timing of any future unit repurchases and the ultimate number of units to be purchased will depend on a number of factors, including business and market conditions, our future financial performance, and other capital priorities. Please read "Part II - Item 2. Unregistered Sales of Equity Securities and Use of Proceeds" of this Quarterly Report on Form 10-Q for more information on unit repurchase program.

Cash Flows

Cash provided by operating activities was $158.2 million for the 2021 Period compared to $170.2 million for the 2020 Period.  The decrease in cash provided by operating activities was primarily due to an unfavorable working capital change related to trade receivables partially offset by a favorable working capital change related to accounts payable.

Net cash used in investing activities was $50.2 million for the 2021 Period compared to $87.5 million for the 2020 Period.  The decrease in cash used in investing activities was primarily attributable to the decrease in capital expenditures for mine infrastructure and equipment at various mines during the 2021 Period.

Net cash used in financing activities was $125.8 million for the 2021 Period compared to $84.1 million for the 2020 Period.  The increase in cash used in financing activities was primarily attributable to increased payments and reduced borrowings on the revolving credit facility, partially offset by lower cash distributions paid to unitholders compared to the 2020 Period. A quarterly cash distribution of $0.40 per unit was paid in February 2020, after which payment of distributions to unitholders was temporarily suspended. Payment of distributions resumed in the 2021 Period with a cash distribution of $0.10 per unit paid in May for the quarter ended March 31, 2021.  The quarterly distribution for the 2021 Quarter will be paid in August, 2021.    

Capital Expenditures

Capital expenditures decreased to $55.6 million in the 2021 Period from $84.2 million in the 2020 Period.  See our discussion of "Cash Flows" above concerning the decrease in capital expenditures.

We currently project average estimated annual maintenance capital expenditures over the next five-year period of approximately $4.90 per ton produced.  Our anticipated total capital expenditures, including maintenance capital expenditures, for 2021 are estimated in a range of $125.0 million to $130.0 million.  Management anticipates funding

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remaining 2021 capital requirements with our cash and cash equivalents ($37.7 million as of June 30, 2021), cash flows from operations and investments, borrowings under revolving credit and securitization facilities and cash provided from the issuance of debt or equity.  We will continue to have significant capital requirements over the long term, which may require us to incur debt or seek additional equity capital. The availability and cost of additional capital will depend upon prevailing market conditions, the market price of our common units and several other factors over which we have limited control, as well as our financial condition and results of operations.

Debt Obligations

Credit Facility.  On March 9, 2020, our Intermediate Partnership entered into a Fifth Amended and Restated Credit Agreement (the "Credit Agreement") with various financial institutions.  The Credit Agreement provides for a $459.5 million revolving credit facility, including a sublimit of $125 million for the issuance of letters of credit and a sublimit of $15.0 million for swingline borrowings (the "Revolving Credit Facility"), with a termination date of March 9, 2024.  

The Credit Agreement is guaranteed by certain of our Intermediate Partnership's material direct and indirect subsidiaries (the "Restricted Subsidiaries") and is secured by substantially all the assets of the Restricted Subsidiaries.  The Credit Agreement is also guaranteed by Alliance Minerals but the oil and gas minerals assets of Alliance Minerals and its direct and indirect subsidiaries (collectively with Alliance Minerals, the "Unrestricted Subsidiaries") are not collateral under the Credit Agreement.  Borrowings under the Revolving Credit Facility bear interest, at our option, at either (i) the Base Rate at the greater of three benchmarks or (ii) a Eurodollar Rate, plus margins for (i) or (ii), as applicable, that fluctuate depending upon the ratio of Consolidated Debt to Consolidated Cash Flow (each as defined in the Credit Agreement).  The Eurodollar Rate, with applicable margin, under the Revolving Credit Facility was 2.71% as of June 30, 2021.  On June 30, 2021, we had $21.8 million of letters of credit outstanding with $437.7 million available for borrowing under the Revolving Credit Facility. We incur an annual commitment fee of 0.35% on the undrawn portion of the Revolving Credit Facility.  We utilize the Revolving Credit Facility, as appropriate, for working capital requirements, capital expenditures and investments, scheduled debt payments and distribution payments.  

The Credit Agreement contains various restrictions affecting the Intermediate Partnership and its Restricted Subsidiaries including, among other things, restrictions on incurrence of additional indebtedness and liens, sale of assets, investments, mergers and consolidations and transactions with affiliates, including transactions with Unrestricted Subsidiaries.  In each case, these restrictions are subject to various exceptions.  In addition, the payment of cash distributions is restricted if such payment would result in a fixed charge coverage ratio of less than 1.0 to 1.0 (as defined in the Credit Agreement) for the four most recently ended fiscal quarters.  The Credit Agreement requires the Intermediate Partnership to maintain (a) a debt to cash flow ratio of not more than 2.5 to 1.0, (b) a cash flow to interest expense ratio of not less than 3.0 to 1.0 and (c) a first lien debt to cash flow ratio of not more than 1.5 to 1.0, in each case, during the four most recently ended fiscal quarters. The debt to cash flow ratio, cash flow to interest expense ratio and first lien debt to cash flow ratio were 1.08 to 1.0, 10.66 to 1.0 and 0.20 to 1.0, respectively, for the trailing twelve months ended June 30, 2021.  We remained in compliance with the covenants of the Credit Agreement as of June 30, 2021 and anticipate remaining in compliance with the covenants.

Senior Notes.  On April 24, 2017, the Intermediate Partnership and Alliance Resource Finance Corporation (as co-issuer), a wholly owned subsidiary of the Intermediate Partnership ("Alliance Finance"), issued an aggregate principal amount of $400.0 million of senior unsecured notes due 2025 ("Senior Notes") in a private placement to qualified institutional buyers.  The Senior Notes have a term of eight years, maturing on May 1, 2025 (the "Term") and accrue interest at an annual rate of 7.5%.  Interest is payable semi-annually in arrears on each May 1 and November 1.  The indenture governing the Senior Notes contains customary terms, events of default and covenants relating to, among other things, the incurrence of debt, the payment of distributions or similar restricted payments, undertaking transactions with affiliates and limitations on asset sales.  The issuers of the Senior Notes may redeem all or a part of the notes at any time at redemption prices set forth in the indenture governing the Senior Notes.    

Accounts Receivable Securitization.  On December 5, 2014, certain direct and indirect wholly owned subsidiaries of our Intermediate Partnership entered into a $100.0 million accounts receivable securitization facility ("Securitization Facility").  Under the Securitization Facility, certain subsidiaries sell certain trade receivables on an ongoing basis to our Intermediate Partnership, which then sells the trade receivables to AROP Funding, LLC ("AROP Funding"), a wholly owned bankruptcy-remote special purpose subsidiary of our Intermediate Partnership, which in turn borrows on a revolving basis up to $100.0 million secured by the trade receivables.  After the sale, Alliance Coal, as servicer of the

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assets, collects the receivables on behalf of AROP Funding.  The Securitization Facility bears interest based on a Eurodollar Rate.  The agreement governing the Securitization Facility contains customary terms and conditions, including limitations with regards to certain customer credit ratings.  In January 2021, we extended the term of the Securitization Facility to January 2022 and reduced the borrowing availability under the facility to $60.0 million.  The Securitization Facility was previously scheduled to mature in January 2021.  On June 30, 2021, we had a $38.1 million outstanding balance under the Securitization Facility.  

May 2019 Equipment Financing.  On May 17, 2019, the Intermediate Partnership entered into an equipment financing arrangement accounted for as debt, wherein the Intermediate Partnership received $10.0 million in exchange for conveying its interest in certain equipment owned indirectly by the Intermediate Partnership and entering into a master lease agreement for that equipment (the "May 2019 Equipment Financing"). The May 2019 Equipment Financing contains customary terms and events of default and provides for thirty-six monthly payments with an implicit interest rate of 6.25%, maturing on May 1, 2022. Upon maturity, the equipment will revert to the Intermediate Partnership.

November 2019 Equipment Financing.  On November 6, 2019, the Intermediate Partnership entered into an equipment financing arrangement accounted for as debt, wherein the Intermediate Partnership received $53.1 million in exchange for conveying its interest in certain equipment owned indirectly by the Intermediate Partnership and entering into a master lease agreement for that equipment (the "November 2019 Equipment Financing").  The November 2019 Equipment Financing contains customary terms and events of default and an implicit interest rate of 4.75%, providing for a four-year term with forty-seven monthly payments of $1.0 million and a balloon payment of $11.6 million upon maturity on November 6, 2023.  Upon maturity, the equipment will revert to the Intermediate Partnership.  

June 2020 Equipment Financing.  On June 5, 2020, the Intermediate Partnership entered into an equipment financing arrangement accounted for as debt, wherein the Intermediate Partnership received $14.7 million in exchange for conveying its interest in certain equipment owned indirectly by the Intermediate Partnership and entering into a master lease agreement for that equipment (the "June 2020 Equipment Financing"). The June 2020 Equipment Financing contains customary terms and events of default and provides for forty-eight monthly payments with an implicit interest rate of 6.1%, maturing on June 5, 2024. Upon maturity, the equipment will revert to the Intermediate Partnership.

Line of Credit.  On February 19, 2021, we entered into a line of credit arrangement with a related party for $5.0 million.  The line of credit has a maturity date of February 28, 2023, with an option to extend it for an additional six months and accrue interest at an annual rate of 3.50%.  Interest is payable quarterly commencing March 31, 2021, and continuing each March 31, June 30, September 30 and December 31 thereafter through and including February 28, 2023.  The agreement contains customary terms and events of default and is guaranteed by ARLP.  We utilize the line of credit, as appropriate, for capital expenditures and investments.  As of June 30, 2021, we had drawn $1.8 million under this agreement.

Other.  We also have an agreement with a bank to provide additional letters of credit in an amount of $5.0 million to maintain surety bonds to secure certain asset retirement obligations and our obligations for workers' compensation benefits.  On June 30, 2021, we had $5.0 million in letters of credit outstanding under this agreement.

Related-Party Transactions

We have related-party transactions and activities with Mr. Craft, MGP, ARH II and their respective affiliates. These related-party transactions and activities relate principally to 1) coal mineral leases with The Joseph W. Craft III Foundation and The Kathleen S. Craft Foundation, 2) the use of aircraft, and 3) providing administrative services with respect to certain oil & gas mineral interests Mr. Craft acquired in 2019.  We also have related-party transactions with (a) WKY CoalPlay, LLC ("WKY CoalPlay") regarding four mineral leases, (b) Bluegrass Minerals Management, LLC ("Bluegrass Minerals") through its noncontrolling ownership interest in our consolidated subsidiary, Cavalier Minerals and (c) with our equity interest in AllDale III.  For more information regarding the Bluegrass Minerals and AllDale III, please read "Item 1. Financial Statements (Unaudited)—Note 8 – Variable Interest Entities" and "—Note 9 – Investment" of this Quarterly Report on Form 10-Q.  We also have a line of credit with a related party as discussed in "Item 1. Financial Statements (Unaudited)—Note 7 – Long-Term Debt" of this Quarterly Report on Form 10-Q.  Please read our Annual Report on Form 10-K for the year ended December 31, 2020, "Item 8. Financial Statements and Supplementary Data—Note 21 – Related-Party Transactions" for additional information concerning related-party transactions.

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Other Information

Insurance

Effective October 1, 2020, we renewed our annual property and casualty insurance program. Our property insurance was procured from our wholly owned captive insurance company, Wildcat Insurance.  Wildcat Insurance charged certain of our subsidiaries for the premiums on this program and in return purchased reinsurance for the program in the standard market. The maximum limit in the commercial property program is $100.0 million per occurrence, excluding a $1.5 million deductible for property damage, a 75- or 90-day waiting period for underground business interruption depending on the mining complex and an additional $10.0 million overall aggregate deductible.  We have elected to retain a 10% participating interest in our commercial property insurance program.  We can make no assurances that we will not experience significant insurance claims in the future that could have a material adverse effect on our business, financial condition, results of operations and ability to purchase property insurance in the future.  Also, exposures exist for which no insurance may be available and for which we have not reserved.  In addition, the insurance industry has been subject to efforts by environmental activists to restrict coverages available for fossil fuel companies.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Commodity Price Risk

We have significant long-term coal sales contracts.  Most of the long-term sales contracts are subject to price adjustment provisions, which periodically permit an increase or decrease in the contract price, typically to reflect changes in specified indices or changes in production costs resulting from regulatory changes, or both.

Our results of operations are highly dependent upon the prices we receive for our coal, oil and natural gas.  Regarding coal, the short-term sales contracts favored by some of our coal customers leave us more exposed to risks of declining coal price periods.  Regarding oil & natural gas, significant decline in prices would have a significant impact on our oil & gas royalty revenues.

We have exposure to coal and oil & gas sales prices and price risk for supplies that are used directly or indirectly in the normal course of coal and oil & gas production such as steel, electricity and other supplies. We manage our risk for these items through strategic sourcing contracts for normal quantities required by our operations.  Historically, we have not utilized any commodity price-hedges or other derivatives related to either our sales price or supply cost risks but may do so in the future.

Credit Risk

Most of our coal is sold to United States electric utilities or into the international markets through brokered transactions.  Therefore, our credit risk is primarily with domestic electric power generators and reputable global brokerage firms.  Our policy is to independently evaluate each customer's creditworthiness prior to entering into transactions and to constantly monitor outstanding accounts receivable. When deemed appropriate by our credit management department, we will take steps to reduce our credit exposure to customers that do not meet our credit standards or whose credit has deteriorated. These steps may include obtaining letters of credit or cash collateral, requiring prepayment for shipments or establishing customer trust accounts held for our benefit in the event of a failure to pay.  Such credit risks from customers may impact the borrowing capacity of our Securitization Facility.  See "Part I - Item 2.   Management's Discussion and Analysis of Financial Condition and Results of Operations—Debt Obligations – Accounts Receivable Securitization".

Exchange Rate Risk

Almost all our transactions are denominated in United States dollars, and as a result, we do not have material exposure to currency exchange-rate risks. However, because coal is sold internationally in United States dollars, general economic conditions in foreign markets and changes in foreign currency exchange rates may provide our foreign competitors with a competitive advantage. If our competitors' currencies decline against the United States dollar or against foreign purchasers' local currencies, those competitors may be able to offer lower prices for coal to these purchasers. Furthermore, if the currencies of overseas purchasers were to significantly decline in value in comparison to the United States dollar, those purchasers may seek decreased prices for the coal we sell to them. Consequently, currency fluctuations could adversely affect the competitiveness of our coal in international markets.

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Interest Rate Risk

Borrowings under the Revolving Credit Facility and Securitization Facility are at variable rates and, as a result, we have interest rate exposure.  Historically, our earnings have not been materially affected by changes in interest rates and we have not utilized interest rate derivative instruments related to our outstanding debt.  We had no outstanding borrowings under the Revolving Credit Facility and $38.1 million in borrowings under the Securitization Facility on June 30, 2021.  A one percentage point increase in the interest rates related to the Securitization Facility would result in an annualized increase in interest expense of $0.4 million, based on borrowing levels on June 30, 2021.  

There were no other changes in our quantitative and qualitative disclosures about market risk as set forth in our Annual Report on Form 10-K for the year ended December 31, 2020.

ITEM 4.CONTROLS AND PROCEDURES

We maintain controls and procedures designed to provide reasonable assurance that information required to be disclosed in the reports we file with the Securities and Exchange Commission ("SEC") is recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow for timely decisions regarding required disclosure.  As required by Rule 13a-15(b) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), we have evaluated, under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rule 13a-15(e) or Rule 15d-15(e) of the Exchange Act) as of June 30, 2021.  Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that these controls and procedures are effective as of June 30, 2021.

During the quarter ended June 30, 2021, we discovered that certain of our computer systems were subject to a cyber incident that did not materially impact our business, financial position or results of operations.  We are taking appropriate steps in response to the incident, including providing individual notifications. Because of this incident and the recent focus nationally on increases in ransomware attacks and other cybersecurity incidents on critical infrastructure, we implemented two-factor authentication and other security enhancements for access to our internal network as well as improvements to our network backup and recovery processes.  We do not consider these changes to our information technology environment, under which many of our internal controls operate, to be material changes in our internal control over financial reporting, but expect that these changes will strengthen our overall system of internal control over financial reporting.

During the quarterly period ended June 30, 2021, there have not been any changes in our internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) identified in connection with our evaluation, including the changes discussed above, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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FORWARD-LOOKING STATEMENTS

Certain statements and information in this Quarterly Report on Form 10-Q, and certain oral statements made from time to time by our representatives, constitute "forward-looking statements."  These statements are based on our beliefs as well as assumptions made by, and information currently available to, us.  When used in this document, the words "anticipate," "believe," "continue," "could," "estimate," "expect," "forecast," "foresee," "may," "outlook," "plan," "project," "potential," "should," "will," "would," and similar expressions identify forward-looking statements.  Without limiting the foregoing, all statements relating to our future outlook, anticipated capital expenditures, future cash flows and borrowings and sources of funding are forward-looking statements. These forward-looking statements are based on our current expectations and beliefs concerning future developments and reflect our current views with respect to future events and are subject to numerous assumptions that we believe are reasonable, but are open to a wide range of uncertainties and business risks, and actual results could differ materially from those discussed in these statements.  Among the factors that could cause actual results to differ from those in the forward-looking statements are:

● the severity, magnitude and duration of the COVID-19 pandemic, including impacts of the pandemic and of businesses' and governments' responses to the pandemic on our operations and personnel, and on demand for coal, oil and natural gas, the financial condition of our customers and suppliers, available liquidity and capital sources and broader economic disruptions;

● changes in macroeconomic and market conditions and market volatility arising from the COVID-19 pandemic, including coal, oil, natural gas and natural gas liquids prices, and the impact of such changes and volatility on our financial position;

● decline in the coal industry's share of electricity generation, including as a result of environmental concerns related to coal mining and combustion and the cost and perceived benefits of other sources of electricity and fuels, such as oil & gas, nuclear energy, and renewable fuels;

● changing global economic conditions or in industries in which our customers operate;

● changes in coal prices and/or oil & gas prices, demand and availability which could affect our operating results and cash flows;

● actions of the major oil producing countries with respect to oil production volumes and prices could have direct and indirect impacts over the near and long term on oil & gas exploration and production operations at the properties in which we hold mineral interests;

● the effectiveness or lack of effectiveness in distributed vaccines to reduce the impact of COVID-19;

● changes in competition in domestic and international coal markets and our ability to respond to such changes;

● potential shut-ins of production by operators of the properties in which we hold mineral interests due to low oil, natural gas and natural gas liquid prices or the lack of downstream demand or storage capacity;

● risks associated with the expansion of our operations and properties;

● our ability to identify and complete acquisitions;

● dependence on significant customer contracts, including renewing existing contracts upon expiration;

● adjustments made in price, volume, or terms to existing coal supply agreements;

● recent action and the possibility of future action on trade made by United States and foreign governments;

● the effect of changes in taxes or tariffs and other trade measures;

● legislation, regulations, and court decisions and interpretations thereof, both domestic and foreign, including those relating to the environment and the release of greenhouse gases, mining, miner health and safety, hydraulic fracturing, and health care;

● deregulation of the electric utility industry or the effects of any adverse change in the coal industry, electric utility industry, or general economic conditions;

● investors' and other stakeholders' increasing attention to environmental, social and governance matters;

● liquidity constraints, including those resulting from any future unavailability of financing;

● customer bankruptcies, cancellations or breaches to existing contracts, or other failures to perform;

● customer delays, failure to take coal under contracts or defaults in making payments;

● our productivity levels and margins earned on our coal sales;

● disruptions to oil & gas exploration and production operations at the properties in which we hold mineral interests;

● changes in raw material costs;

● changes in the availability of skilled labor;

● our ability to maintain satisfactory relations with our employees;

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● increases in labor costs including costs of health insurance and taxes resulting from the Affordable Care Act, adverse changes in work rules, or cash payments or projections associated with workers' compensation claims;

● increases in transportation costs and risk of transportation delays or interruptions;

● operational interruptions due to geologic, permitting, labor, weather-related or other factors;

● risks associated with major mine-related accidents, mine fires, mine floods or other interruptions;

● results of litigation, including claims not yet asserted;

● foreign currency fluctuations that could adversely affect the competitiveness of our coal abroad;

● difficulty maintaining our surety bonds for mine reclamation as well as workers' compensation and black lung benefits;

● difficulty in making accurate assumptions and projections regarding post-mine reclamation as well as pension, black lung benefits, and other post-retirement benefit liabilities;

● uncertainties in estimating and replacing our coal reserves;

● uncertainties in estimating and replacing our oil & gas reserves;

● uncertainties in the amount of oil & gas production due to the level of drilling and completion activity by the operators of our oil & gas properties;

● the impact of current and potential changes to federal or state tax rules and regulations, including a loss or reduction of benefits from certain tax deductions and credits;

● difficulty obtaining commercial property insurance, and risks associated with our participation in the commercial insurance property program;

● evolving cybersecurity risks, such as those involving unauthorized access, denial-of-service attacks, malicious software, data privacy breaches by employees, insiders or others with authorized access, cyber or phishing-attacks, ransomware, malware, social engineering, physical breaches or other actions;

● difficulty in making accurate assumptions and projections regarding future revenues and costs associated with equity investments in companies we do not control; and

● other factors, including those discussed in "Item 1A. Risk Factors" and "Item 3. Legal Proceedings" in our Annual Report on Form 10-K for the year ended December 31, 2020.

If one or more of these or other risks or uncertainties materialize, or should our underlying assumptions prove incorrect, our actual results could differ materially from those described in any forward-looking statement.  When considering forward-looking statements, you should also keep in mind our risk factors and legal proceedings.  Known material factors that could cause our actual results to differ from those in the forward-looking statements are described in "Item 1. Legal Proceedings" and "Item 1A. Risk Factors" below.  We disclaim any obligation to update or revise any forward-looking statements or to announce publicly the result of any revisions to any of the forward-looking statements to reflect future events or developments, unless required by law.

You should consider the information above when reading or considering any forward-looking statements contained in:

● this Quarterly Report on Form 10-Q;

● other reports filed by us with the SEC;

● our press releases;

● our website http://www.arlp.com; and

● written or oral statements made by us or any of our officers or other authorized persons acting on our behalf.

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PART II

OTHER INFORMATION

ITEM 1.LEGAL PROCEEDINGS

Litigation was initiated in November 2019 in the U.S. District Court for the Western District of Kentucky (Branson v. Webster County Coal, LLC et al.) against certain of our subsidiaries in which the plaintiff alleges violations of the Fair Labor Standards Act and Kentucky Wage and Hour Act due to alleged failure to compensate for time "donning" and "doffing" equipment and to account for certain bonuses in the calculation of overtime rates and pay.  The plaintiff seeks class or collective action certification.  A similar lawsuit was initiated in March 2020 in the U.S. District Court for the Eastern District of Kentucky (Brewer v. Alliance Coal, LLC, et al.).  Collectively, the plaintiffs of these two lawsuits allege damages ranging from approximately $22.2 million to $143.7 million.  Subsequently, four additional lawsuits making similar allegations were initiated against certain of our subsidiaries: filed March 4, 2021 in the Circuit Court for Hopkins County, Kentucky (Johnson v. Hopkins County Coal, LLC, et al.); filed April 6, 2021 in the U.S. District Court for the Northern District of West Virginia (Rettig v. Mettiki Coal WV, LLC, et al.); filed April 9, 2021 in the U.S. District Court for the Southern District of Illinois (Cates v. Hamilton County Coal, LLC, et al.); and filed April 13, 2021 in the U.S. District Court for the Southern District of Indiana (Prater v. Gibson County Coal, LLC, et al.).  We believe the claims made in these lawsuits are without merit and intend to defend the litigation vigorously.  The litigation is in early stages.  We do not believe this litigation will have a material adverse effect on our business, financial position or results of operations.

ITEM 1A.RISK FACTORS

In addition to the other information set forth in this Quarterly Report on Form 10-Q, you should carefully consider the risk factors discussed in Part I - Item 1A. "Risk Factors" in our Annual Report on Form 10-K for the year ended December 31, 2020, which could materially affect our business, financial condition or future results. The risks described in these reports are not our only risks.  Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial based on current knowledge and factual circumstances, if such knowledge or facts change, also may materially adversely affect our business, financial condition and/or operating results in the future.  

ITEM 2.UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

On May 31, 2018, ARLP announced that the MGP board of directors approved the establishment of a unit repurchase program authorizing ARLP to repurchase up to $100 million of its outstanding limited partner common units.  The unit repurchase program is intended to enhance ARLP's ability to achieve its goal of creating long-term value for its unitholders and provides another means, along with quarterly cash distributions, of returning cash to unitholders. The program has no time limit and ARLP may repurchase units from time to time in the open market or in other privately negotiated transactions. The unit repurchase program authorization does not obligate ARLP to repurchase any dollar amount or number of units and repurchases may be commenced or suspended from time to time without prior notice.    

During the three months ended June 30, 2021, we did not repurchase and retire any units. Since inception of the unit repurchase program, we have repurchased and retired 5,460,639 units at an average unit price of $17.12 for an aggregate purchase price of $93.5 million.

ITEM 3.DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4.MINE SAFETY DISCLOSURES

Information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K (17 CFR 229.104) is included in Exhibit 95.1 to this Quarterly Report on Form 10-Q.

ITEM 5.OTHER INFORMATION

None.

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ITEM 6.EXHIBITS

		Incorporated by Reference
Exhibit Number	Exhibit Description	Form	SEC File No. and Film No.	Exhibit	Filing Date	Filed Herewith*
3.1	Fourth Amended and Restated Agreement of Limited Partnership of Alliance Resource Partners, L.P.	8-K	000-26823 17990766	3.2	07/28/2017
3.2	Amendment No. 1 to Fourth Amended and Restated Agreement of Limited Partnership of Alliance Resource Partners, L.P.	10-K	000-26823 18634634	3.9	02/23/2018
3.3	Amendment No. 2 to Fourth Amended and Restated Agreement of Limited Partnership of Alliance Resource Partners, L.P.	8-K	000-26823 18883834	3.3	06/06/2018
3.4	Amendment No. 3 to Fourth Amended and Restated Agreement of Limited Partnership of Alliance Resource Partners, L.P.	8-K	000-26823 18883834	3.4	06/06/2018
3.5	Amended and Restated Agreement of Limited Partnership of Alliance Resource Operating Partners, L.P.	10-K	000-26823 583595	3.2	03/29/2000
3.6	Amendment No. 1 to Amended and Restated Agreement of Limited Partnership of Alliance Resource Operating Partners, L.P.	8-K	000-26823 18883834	3.5	06/06/2018
3.7	Amended and Restated Certificate of Limited Partnership of Alliance Resource Partners, L.P.	8-K	000-26823 17990766	3.6	07/28/2017
3.8	Certificate of Limited Partnership of Alliance Resource Operating Partners, L.P.	S-1/A	333-78845 99669102	3.8	07/23/1999
3.9	Certificate of Formation of Alliance Resource Management GP, LLC	S-1/A	333-78845 99669102	3.7	07/23/1999
3.10	Third Amended and Restated Operating Agreement of Alliance Resource Management GP, LLC	8-K	000-26823 18883834	3.7	06/06/2018
3.11	Certificate of Formation of MGP II, LLC	8-K	000-26823 17990766	3.5	07/28/2017
3.12	Amended and Restated Operating Agreement of MGP II, LLC	8-K	000-26823 17990766	3.4	07/28/2017

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		Incorporated by Reference
Exhibit Number	Exhibit Description	Form	SEC File No. and Film No.	Exhibit	Filing Date	Filed Herewith*
31.1	Certification of Joseph W. Craft III, President and Chief Executive Officer of Alliance Resource Management GP, LLC, the general partner of Alliance Resource Partners, L.P., dated August 6, 2021, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Brian L. Cantrell, Senior Vice President and Chief Financial Officer of Alliance Resource Management GP, LLC, the general partner of Alliance Resource Partners, L.P., dated August 6, 2021, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Joseph W. Craft III, President and Chief Executive Officer of Alliance Resource Management GP, LLC, the general partner of Alliance Resource Partners, L.P., dated August 6, 2021, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Brian L. Cantrell, Senior Vice President and Chief Financial Officer of Alliance Resource Management GP, LLC, the general partner of Alliance Resource Partners, L.P., dated August 6, 2021, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
95.1	Federal Mine Safety and Health Act Information
101	Interactive Data File (Form 10-Q for the quarter ended June 30, 2021 filed in Inline XBRL).
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).

*    Or furnished, in the case of Exhibits 32.1 and 32.2.

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SIGNATURES

Pursuant to the requirements 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, in Tulsa, Oklahoma, on August 6, 2021.

ALLIANCE RESOURCE PARTNERS, L.P.
By:	Alliance Resource Management GP, LLC
	its general partner
	/s/ Joseph W. Craft, III
	Joseph W. Craft, III
	President, Chief Executive Officer
	and Chairman, duly authorized to sign on behalf of the registrant.
	/s/ Robert J. Fouch
	Robert J. Fouch
	Vice President, Controller and
	Chief Accounting Officer

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EX-31.1

Exhibit 31.1

CERTIFICATION

I, Joseph W. Craft III certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Alliance Resource Partners, L.P.;

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 we 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 conclusion 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 quarterly period ended June 30, 2021 that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting;

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: August 6, 2021

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/s/ Joseph W. Craft III

Joseph W. Craft III

President, Chief Executive

Officer and Chairman

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Brian L. Cantrell, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Alliance Resource Partners, L.P.;

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 we 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 conclusion 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 quarterly period ended June 30, 2021 that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting;

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: August 6, 2021

Ay 9, 2017

/s/ Brian L. Cantrell

Brian L. Cantrell

Senior Vice President and

Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Alliance Resource Partners, L.P. (the “Partnership”) on Form 10-Q for the three months ended June 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Joseph W. Craft III, President, Chief Executive Officer and Chairman of Alliance Resource Management GP, LLC, the general partner of the Partnership, certify, pursuant to 18 U.S.C. section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Partnership.

ay
	By:	/s/ Joseph W. Craft III
	Joseph W. Craft III
	President, Chief Executive Officer and Chairman
	of Alliance Resource Management GP, LLC
	(the general partner of Alliance Resource Partners, L.P.)

Date: August 6, 2021

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Report or as a separate document.  A signed original of this written statement required by Section 906 has been provided to the Partnership and will be retained by the Partnership and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Alliance Resource Partners, L.P. (the “Partnership”) on Form 10-Q for the three months ended June 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Brian L. Cantrell, Senior Vice President and Chief Financial Officer of Alliance Resource Management GP, LLC, the general partner of the Partnership, certify, pursuant to 18 U.S.C. section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Partnership.

By:	/s/ Brian L. Cantrell
Brian L. Cantrell
Senior Vice President and
Chief Financial Officer
of Alliance Resource Management GP, LLC
(the general partner of Alliance Resource Partners, L.P.)

Date: August 6, 2021

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Report or as a separate document.  A signed original of this written statement required by Section 906 has been provided to the Partnership and will be retained by the Partnership and furnished to the Securities and Exchange Commission or its staff upon request.

EX-95.1

EXHIBIT 95.1

Federal Mine Safety and Health Act Information

Our mining operations are subject to extensive and stringent compliance standards established pursuant to the Federal Mine Safety and Health Act of 1977, as amended by the Federal Mine Improvement and New Emergency Response Act of 2006 (as amended, the "Mine Act").  MSHA monitors and rigorously enforces compliance with these standards, and our mining operations are inspected frequently.  Citations and orders are issued by MSHA under Section 104 of the Mine Act for violations of the Mine Act or any mandatory health or safety standard, rule, order or regulation promulgated under the Mine Act.  A Section 104(a) "Significant and Substantial" or "S&S" citation is generally issued in a situation where the conditions created by the violation do not cause imminent danger, but in the opinion of the MSHA inspector could significantly and substantially contribute to the cause and effect of a mine safety or health hazard.  During the three months ended June 30, 2021, our mines were subject to 1,183 MSHA inspection days with an average of only 0.05 S&S citations written per inspection day.

The Mine Act has been construed as authorizing MSHA to issue citations and orders pursuant to the legal doctrine of strict liability, or liability without regard to fault.  If, in the opinion of an MSHA inspector, a condition exists that violates the Mine Act or regulations promulgated thereunder, then a citation or order will be issued regardless of whether we had any knowledge of, or fault in, the existence of that condition.  Many of the Mine Act standards include one or more subjective elements, so that issuance of a citation often depends on the opinions or experience of the MSHA inspector involved and the frequency of citations will vary from inspector to inspector.

If we disagree with the assertions of an MSHA inspector, we may exercise our right to challenge those findings by "contesting" the citation or order pursuant to the procedures established by the Mine Act and its regulations.  During the three months ended June 30, 2021, our operating subsidiaries contested approximately 5.0% of all citations and 16.1% of S&S citations issued by MSHA inspectors.  These contest proceedings frequently result in the dismissal or modification of previously issued citations, substantial reductions in the penalty amounts originally assessed by MSHA, or both.

The Dodd-Frank Wall Street Reform and Consumer Protection Act ("Dodd-Frank Act") requires issuers to include in periodic reports filed with the SEC certain information relating to citations or orders for violations of standards under the Mine Act.  The following tables include information required by the Dodd-Frank Act for the three months ended June 30, 2021.  The mine data retrieval system maintained by MSHA may show information that is different than what is provided herein.  Any such difference may be attributed to the need to update that information on MSHA’s system and/or other factors.

						Total Dollar Value of
	Section 104(a)	Section	Section 104(d)	Section	Section	MSHA Assessments
Subsidiary Name / MSHA	S&S	104(b)	Citations and	110(b)(2)	107(a)	Proposed
Identification Number (1)	Citations(2)	Orders (3)	Orders (4)	Violations (5)	Orders (6)	(in thousands) (7)
Illinois Basin Operations
Webster County Coal, LLC (KY)
1502132	-	-	-	-	-	$	-
1511935	-	-	-	-	-	$	-
Warrior Coal, LLC (KY)
1505230	-	-	-	-	-	$	-
1512083	-	-	-	-	-	$	-
1513514	-	-	-	-	-	$	-
1516460	-	-	-	-	-	$	-
1517216	19	-	-	-	-	$	22.4
1517232	-	-	-	-	-	$	-
1517678	-	-	-	-	-	$	-
1517740	-	-	-	-	-	$	-
1517758	-	-	-	-	-	$	-
1514335	-	-	-	-	-	$	0.3
Hopkins County Coal, LLC (KY)
1502013	-	-	-	-	-	$	-
1517377	-	-	-	-	-	$	-
1517515	-	-	-	-	-	$	-
1518826	-	-	-	-	-	$	-
1517378	-	-	-	-	-	$	-
River View Coal, LLC (KY)
1503178	5	-	-	-	-	$	3.5
1519374	23	-	-	-	-	$	43.3
White County Coal, LLC (IL)
1102662	-	-	-	-	-	$	-
1103058	-	-	-	-	-	$	-
Hamilton County Coal, LLC (IL)
1103242	-	-	-	-	-	$	0.3
1103203	3	-	-	-	-	$	7.4
Gibson County Coal, LLC (IN)
1202388	1	-	-	-	-	$	1.0
1202215	-	-	-	-	-	$	-
1202494	-	-	-	-	-	$	-
Sebree Mining, LLC (KY)
1519264	-	-	-	-	-	$	-
1518547	-	-	-	-	-	$	-
1517044	-	-	-	-	-	$	-
Appalachia Operations
MC Mining, LLC (KY)
1508079	-	-	-	-	-	$	-
1517733	-	-	-	-	-	$	0.3
1519515	-	-	-	-	-	$	-
1519838	2	-	-	-	-	$	11.1
Mettiki Coal, LLC (MD)
1800621	-	-	-	-	-	$	-
1800671	1	-	-	-	-	$	-
1800761	-	-	-	-	-	$	-
Mettiki Coal (WV), LLC
4609028	-	-	-	-	-	$	0.4
Tunnel Ridge, LLC (PA/WV)
4608864	2	-	-	-	-	$	3.2
Other
4403236	-	-	-	-	-	$	-
4403255	-	-	-	-	-	$	-
4406630	-	-	-	-	-	$	-
4406867	-	-	-	-	-	$	-
1502709	-	-	-	-	-	$	-
Mid-America Carbonates, LLC (IL)
1103176	-	-	-	-	-	$	-

	Total	Received Notice	Legal	Legal	Legal
	Number of	of Pattern of	Actions	Actions	Actions
	Mining	Violations Under	Pending as of	Initiated	Resolved
Subsidiary Name / MSHA	Related	Section 104(e)	Last Day of	During	During
Identification Number (1)	Fatalities	(yes/no) (8)	Period	Period	Period
Illinois Basin Operations
Webster County Coal, LLC (KY)
1502132	-	No	-	-	-
1511935	-	No	-	-	-
Warrior Coal, LLC (KY)
1505230	-	No	-	-	-
1512083	-	No	-	-	-
1513514	-	No	-	-	-
1516460	-	No	-	-	-
1517216	-	No	3	3	5
1517232	-	No	-	-	-
1517678	-	No	-	-	-
1517740	-	No	-	-	-
1517758	-	No	-	-	-
1514335	-	No	-	-	-
Hopkins County Coal, LLC (KY)
1502013	-	No	-	-	-
1517377	-	No	-	-	-
1517515	-	No	-	-	-
1518826	-	No	-	-	-
1517378	-	No	-	-	-
River View Coal, LLC (KY)
1503178	-	No	-	-	1
1519374	-	No	3	4	3
White County Coal, LLC (IL)
1102662	-	No	-	-	-
1103058	-	No	-	-	-
Hamilton County Coal, LLC (IL)
1103242	-	No	-	-	-
1103203	-	No	-	-	2
Gibson County Coal, LLC (IN)
1202388	-	No	-	-	-
1202215	-	No	-	-	-
1202494	-	No	-	-	-
Sebree Mining, LLC (KY)
1519264	-	No	-	-	-
1518547	-	No	-	-	-
1517044	-	No	-	-	-
Appalachia Operations
MC Mining, LLC (KY)
1508079	-	No	-	-	-
1517733	-	No	-	-	-
1519515	-	No	-	-	-
1519838	-	No	1	1	1
Mettiki Coal, LLC (MD)
1800621	-	No	-	-	-
1800671	-	No	-	-	-
1800761	-	No	-	-	-
Mettiki Coal (WV), LLC
4609028	-	No	-	-	1
Tunnel Ridge, LLC (PA/WV)
4608864	-	No	-	-	-
Other
4403236	-	No	-	-	-
4403255	-	No	-	-	-
4406630	-	No	-	-	-
4406867	-	No	-	-	-
Mid-America Carbonates, LLC (IL)
1103176	-	No	-	-	-

The number of legal actions pending before the Federal Mine Safety and Health Review Commission as of June 30, 2021 that fall into each of the following categories is as follows:

				Complaints of	Applications
	Contests of	Contests of	Complaints	Discharge/	for	Appeals of
Subsidiary Name / MSHA	Citations	Proposed	for	Discrimination	Temporary	Judges
Identification Number (1)	and Orders	Penalties (9)	Compensation	/Interference	Relief	Rulings
Illinois Basin Operations
Webster County Coal, LLC (KY)
1502132	-	-	-	-	-	-
1511935	-	-	-	-	-	-
Warrior Coal, LLC (KY)
1505230	-	-	-	-	-	-
1512083	-	-	-	-	-	-
1513514	-	-	-	-	-	-
1516460	-	-	-	-	-	-
1517216	-	3	-	-	-	-
1517232	-	-	-	-	-	-
1517678	-	-	-	-	-	-
1517740	-	-	-	-	-	-
1517758	-	-	-	-	-	-
1514335	-	-	-	-	-	-
Hopkins County Coal, LLC (KY)
1502013	-	-	-	-	-	-
1517377	-	-	-	-	-	-
1517515	-	-	-	-	-	-
1518826	-	-	-	-	-	-
1517378	-	-	-	-	-	-
River View Coal, LLC (KY)
1503178	-	-	-	-	-	-
1519374	-	3	-	-	-	-
White County Coal, LLC (IL)
1102662	-	-	-	-	-	-
1103058	-	-	-	-	-	-
Hamilton County Coal, LLC (IL)
1103242	-	-	-	-	-	-
1103203	-	-	-	-	-	-
Gibson County Coal, LLC (IN)
1202388	-	-	-	-	-	-
1202215	-	-	-	-	-	-
1202494	-	-	-	-	-	-
Sebree Mining, LLC (KY)
1519264	-	-	-	-	-	-
1518547	-	-	-	-	-	-
1517044	-	-	-	-	-	-
Appalachia Operations
MC Mining, LLC (KY)
1508079	-	-	-	-	-	-
1517733	-	-	-	-	-	-
1519515	-	-	-	-	-	-
1519838	-	1	-	-	-	-
Mettiki Coal, LLC (MD)
1800621	-	-	-	-	-	-
1800671	-	-	-	-	-	-
1800761	-	-	-	-	-	-
Mettiki Coal (WV), LLC
4609028	-	-	-	-	-	-
Tunnel Ridge, LLC (PA/WV)
4608864	-	-	-	-	-	-
Other
4403236	-	-	-	-	-	-
4403255	-	-	-	-	-	-
4406630	-	-	-	-	-	-
4406867	-	-	-	-	-	-
Mid-America Carbonates, LLC (IL)
1103176	-	-	-	-	-	-

(1) The statistics reported for each of our subsidiaries listed above are segregated into specific MSHA identification numbers.  

(2) Mine Act section 104(a) S&S citations shown above are for alleged violations of mandatory health or safety standards that could significantly and substantially contribute to a coal mine health and safety hazard.  It should be noted that, for purposes of this table, S&S citations that are included in another column, such as Section 104(d) citations, are not also included as Section 104(a) S&S citations in this column.  

(3) Mine Act section 104(b) orders are for alleged failures to totally abate a citation within the time period specified in the citation.

(4) Mine Act section 104(d) citations and orders are for an alleged unwarrantable failure (i.e., aggravated conduct constituting more than ordinary negligence) to comply with mandatory health or safety standards.

(5) Mine Act section 110(b)(2) violations are for an alleged "flagrant" failure (i.e., reckless or repeated) to make reasonable efforts to eliminate a known violation of a mandatory safety or health standard that substantially and proximately caused, or reasonably could have been expected to cause, death or serious bodily injury.

(6) Mine Act section 107(a) orders are for alleged conditions or practices which could reasonably be expected to cause death or serious physical harm before such condition or practice can be abated and result in orders of immediate withdrawal from the area of the mine affected by the condition.

(7) Amounts shown include assessments proposed by MSHA during the three months ended June 30, 2021 on all citations and orders, including those citations and orders that are not required to be included within the above chart.

(8) Mine Act section 104(e) written notices are for an alleged pattern of violations of mandatory health or safety standards that could significantly and substantially contribute to a coal mine safety or health hazard.

(9) Pursuant to the Procedural Rules of the Federal Mine Safety and Health Review Commission, mine operators may contest the underlying validity and fact of an alleged citation or order, as well as any special findings of an alleged citation or order, including a significant and substantial or unwarrantable failure designation, as part of any proceeding contesting a proposed penalty assessment.    

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Aug. 06, 2021
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2021
Entity File Number	0-26823
Entity Registrant Name	ALLIANCE RESOURCE PARTNERS LP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	73-1564280
Entity Address, Address Line One	1717 South Boulder Avenue, Suite 400
Entity Address, City or Town	Tulsa
Entity Address, State or Province	OK
Entity Address, Postal Zip Code	74119
City Area Code	918
Local Phone Number	295-7600
Title of 12(b) Security	Common units
Trading Symbol	ARLP
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Units Outstanding		127,195,219
Entity Central Index Key	0001086600
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 37,749	$ 55,574
Trade receivables	132,033	104,579
Other receivables	2,067	3,481
Inventories, net	74,505	56,407
Advance royalties	2,063	4,168
Prepaid expenses and other assets	12,536	21,565
Total current assets	260,953	245,774
PROPERTY, PLANT AND EQUIPMENT:
Property, plant and equipment, at cost	3,548,857	3,554,090
Less accumulated depreciation, depletion and amortization	(1,820,903)	(1,753,845)
Total property, plant and equipment, net	1,727,954	1,800,245
OTHER ASSETS:
Advance royalties	65,087	56,791
Equity method investments	26,274	27,268
Goodwill	4,373	4,373
Operating lease right-of-use assets	14,713	15,004
Other long-term assets	16,159	16,561
Total other assets	126,606	119,997
TOTAL ASSETS	2,115,513	2,166,016
CURRENT LIABILITIES:
Accounts payable	55,840	47,511
Accrued taxes other than income taxes	21,019	25,054
Accrued payroll and related expenses	38,951	28,524
Accrued interest	5,000	5,132
Workers' compensation and pneumoconiosis benefits	10,618	10,646
Current finance lease obligations	802	766
Current operating lease obligations	1,823	1,854
Other current liabilities	14,119	21,919
Current maturities, long-term debt, net	55,558	73,199
Total current liabilities	203,730	214,605
LONG-TERM LIABILITIES:
Long-term debt, excluding current maturities, net	426,643	519,421
Pneumoconiosis benefits	106,403	105,068
Accrued pension benefit	42,031	46,965
Workers' compensation	44,868	47,521
Asset retirement obligations	122,559	121,487
Long-term finance lease obligations	1,047	1,458
Long-term operating lease obligations	13,010	13,078
Other liabilities	20,702	24,146
Total long-term liabilities	777,263	879,144
Total liabilities	980,993	1,093,749
ARLP Partners' Capital:
Limited Partners - Common Unitholders 127,195,219 units outstanding	1,206,511	1,148,565
Accumulated other comprehensive loss	(83,212)	(87,674)
Total ARLP Partners' Capital	1,123,299	1,060,891
Noncontrolling interest	11,221	11,376
Total Partners' Capital	1,134,520	1,072,267
TOTAL LIABILITIES AND PARTNERS' CAPITAL	$ 2,115,513	$ 2,166,016

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Jun. 30, 2021	Dec. 31, 2020
CONDENSED CONSOLIDATED BALANCE SHEETS
Common units outstanding	127,195,219	127,195,219

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
SALES AND OPERATING REVENUES:
Revenues	$ 362,443	$ 255,202	$ 681,065	$ 605,965
EXPENSES:
Outside coal purchases	114		114
General and administrative	17,492	13,822	32,996	27,260
Depreciation, depletion and amortization	64,733	83,559	123,935	157,480
Asset impairments				24,977
Goodwill impairment				132,026
Total operating expenses	307,436	290,302	589,730	773,745
INCOME (LOSS) FROM OPERATIONS	55,007	(35,100)	91,335	(167,780)
Interest expense (net of interest capitalized for the three and six months ended June 30, 2021 and 2020 of $105, $509, $191 and $1,066, respectively)	(9,842)	(11,446)	(20,238)	(23,725)
Interest income	15	30	32	82
Equity method investment income	341	137	403	588
Other expense	(1,351)	(377)	(2,548)	(733)
INCOME (LOSS) BEFORE INCOME TAXES	44,170	(46,756)	68,984	(191,568)
INCOME TAX EXPENSE (BENEFIT)	5	(77)	(7)	(182)
NET INCOME (LOSS)	44,165	(46,679)	68,991	(191,386)
LESS: NET LOSS (INCOME) ATTRIBUTABLE TO NONCONTROLLING INTEREST	(130)	15	(208)	(61)
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP	$ 44,035	$ (46,664)	$ 68,783	$ (191,447)
EARNINGS PER LIMITED PARTNER UNIT - BASIC AND DILUTED	$ 0.34	$ (0.37)	$ 0.53	$ (1.51)
WEIGHTED-AVERAGE NUMBER OF UNITS OUTSTANDING - BASIC AND DILUTED	127,195,219	127,195,219	127,195,219	127,133,764
Product [Member]
EXPENSES:
Operating expenses (excluding depreciation, depletion and amortization)	$ 213,039	$ 187,164	$ 409,559	$ 421,506
Coal sales
SALES AND OPERATING REVENUES:
Revenues	325,974	236,286	613,461	550,923
Oil & gas royalties
SALES AND OPERATING REVENUES:
Revenues	17,114	7,786	31,113	22,025
Transportation revenues
SALES AND OPERATING REVENUES:
Revenues	12,058	5,757	23,126	10,496
EXPENSES:
Operating expenses (excluding depreciation, depletion and amortization)	12,058	5,757	23,126	10,496
Other revenues
SALES AND OPERATING REVENUES:
Revenues	$ 7,297	$ 5,373	$ 13,365	$ 22,521

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Interest expense, interest capitalized	$ 105	$ 509	$ 191	$ 1,066

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
NET INCOME (LOSS)	$ 44,165	$ (46,679)	$ 68,991	$ (191,386)
OTHER COMPREHENSIVE INCOME (LOSS):
OTHER COMPREHENSIVE INCOME	2,231	939	4,462	1,877
COMPREHENSIVE INCOME (LOSS)	46,396	(45,740)	73,453	(189,509)
Less: Comprehensive loss (income) attributable to noncontrolling interest	(130)	15	(208)	(61)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ARLP	46,266	(45,725)	73,245	(189,570)
Defined benefit pension plan
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of prior service cost	46	47	93	93
Amortization of net actuarial loss (gain)	1,142	1,063	2,283	2,127
Total adjustments	1,188	1,110	2,376	2,220
Pneumoconiosis benefits
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of net actuarial loss (gain)	1,043	(171)	2,086	(343)
Total adjustments	$ 1,043	$ (171)	$ 2,086	$ (343)

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
CASH FLOWS FROM OPERATING ACTIVITIES	$ 158,216	$ 170,168
Property, plant and equipment:
Capital expenditures	(55,626)	(84,245)
Change in accounts payable and accrued liabilities	1,547	(6,508)
Proceeds from sale of property, plant and equipment	2,838	2,739
Distributions received from investments in excess of cumulative earnings	994	551
Net cash used in investing activities	(50,247)	(87,463)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under securitization facility	35,000	12,800
Payments under securitization facility	(52,800)	(47,700)
Proceeds from equipment financings		14,705
Payments on equipment financings	(8,535)	(6,494)
Borrowings under revolving credit facilities	15,000	70,000
Payments under revolving credit facilities	(102,500)	(60,000)
Borrowings from line of credit	1,830
Payments on finance lease obligations	(375)	(8,043)
Payment of debt issuance costs	(6)	(5,776)
Payments for taxes related to net settlement of issuance of units in deferred compensation plans		(1,310)
Distributions paid to Partners	(13,045)	(51,753)	$ (51,753)
Other	(363)	(510)
Net cash used in financing activities	(125,794)	(84,081)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(17,825)	(1,376)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	55,574	36,482	36,482
CASH AND CASH EQUIVALENTS AT END OF PERIOD	37,749	35,106	$ 55,574
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest	18,817	23,337
Cash paid for income taxes	11	4
SUPPLEMENTAL NON-CASH ACTIVITY:
Accounts payable for purchase of property, plant and equipment	$ 7,278	7,996
Right-of-use assets acquired by operating lease		278
Market value of common units issued under deferred compensation plans before tax withholding requirements		$ 3,837

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ORGANIZATION AND PRESENTATION

6 Months Ended

Jun. 30, 2021

ORGANIZATION AND PRESENTATION

ORGANIZATION AND PRESENTATION

1.ORGANIZATION AND PRESENTATION

Significant Relationships Referenced in Notes to Condensed Consolidated Financial Statements

● References to "we," "us," "our" or "ARLP Partnership" mean the business and operations of Alliance Resource Partners, L.P., the parent company, as well as its consolidated subsidiaries.

● References to "ARLP" mean Alliance Resource Partners, L.P., individually as the parent company, and not on a consolidated basis.

● References to "MGP" mean Alliance Resource Management GP, LLC, ARLP's general partner.  

● References to "Mr. Craft" mean Joseph W. Craft III, the Chairman, President and Chief Executive Officer of MGP.

● References to "Intermediate Partnership" mean Alliance Resource Operating Partners, L.P., the intermediate partnership of Alliance Resource Partners, L.P.

● References to "Alliance Coal" mean Alliance Coal, LLC, the holding company for our coal mining operations.

● References to "Alliance Minerals" mean Alliance Minerals, LLC, the holding company for our oil and gas minerals interests.

● References to "Alliance Resource Properties" mean Alliance Resource Properties, LLC, the land holding company for certain of our coal mineral interests, including the subsidiaries of Alliance Resource Properties, LLC.

Organization

ARLP is a Delaware limited partnership listed on the NASDAQ Global Select Market under the ticker symbol "ARLP."  ARLP was formed in May 1999 and completed its initial public offering on August 19, 1999 when it acquired substantially all of the coal production and marketing assets of Alliance Resource Holdings, Inc., a Delaware corporation, and its subsidiaries.  We are managed by our general partner, MGP, a Delaware limited liability company which holds a non-economic general partner interest in ARLP.  

Basis of Presentation

The accompanying condensed consolidated financial statements include the accounts and operations of the ARLP Partnership and present our financial position as of June 30, 2021 and December 31, 2020, the results of our operations and comprehensive income (loss) for the three and six months ended June 30, 2021 and 2020, and cash flows for the six months ended June 30, 2021 and 2020.  All intercompany transactions and accounts have been eliminated.

These condensed consolidated financial statements and notes are prepared pursuant to the rules and regulations of the Securities and Exchange Commission for interim reporting and do not include all the information normally included with financial statements prepared in accordance with generally accepted accounting principles ("GAAP") of the United States.  These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2020.

These condensed consolidated financial statements and notes are unaudited. However, in the opinion of management, these condensed consolidated financial statements reflect all normal recurring adjustments necessary for a fair presentation of the results for the periods presented.  Results for interim periods are not necessarily indicative of results to be expected for the full year ending December 31, 2021.

Use of Estimates

The preparation of the ARLP Partnership's condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts and disclosures in our condensed consolidated financial statements.  Actual results could differ from those estimates.

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LONG-LIVED ASSET IMPAIRMENTS

6 Months Ended

Jun. 30, 2021

LONG-LIVED ASSET IMPAIRMENTS

LONG-LIVED ASSET IMPAIRMENTS

2.LONG-LIVED ASSET IMPAIRMENTS

During the first quarter of 2020, we recorded $23.5 million of non-cash asset impairment charges in our Illinois Basin Coal Operations segment due to sealing our idled Gibson North mine, resulting in its permanent closure, and a decrease in the fair value of certain mining equipment at our idled operations and greenfield coal reserves as a result of weakened coal market conditions. During the same period, we also recorded an asset impairment charge of $1.5 million in our Coal Royalties segment due to a decrease in the fair value of greenfield coal reserves held by Alliance Resource Properties near our coal mining operations in the Illinois Basin. See Note 16 – Segment Information for more information about our segments.

The fair values of the impaired assets were determined using a market approach, which represents Level 3 fair value measurements under the fair value hierarchy.  The fair value analysis used assumptions regarding the marketability of certain mining and reserve assets near our Illinois Basin coal mining operations.

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GOODWILL IMPAIRMENT

6 Months Ended

Jun. 30, 2021

GOODWILL IMPAIRMENT

GOODWILL IMPAIRMENT

3.GOODWILL IMPAIRMENT

During the first quarter of 2020, we considered whether an interim test of our consolidated goodwill of $136.4 million was necessary.  Our consolidated goodwill included $132.0 million recorded in our Illinois Basin Coal Operations segment in conjunction with our acquisition of the Hamilton County Coal, LLC ("Hamilton") mine on July 31, 2015.  We assessed certain events and changes in circumstances, including a) adverse industry and market developments, including the impact of the COVID-19 pandemic, b) our response to these developments, including temporarily ceasing production at several mines, including our Hamilton mine and c) our actual performance during the quarter.  After consideration of these events and changes in circumstances, we performed an interim test of the goodwill associated with Hamilton comparing Hamilton's carrying amount to its fair value.

We estimated the fair value of Hamilton using an income approach utilizing a discounted cash flow model.  The assumptions used in the discounted cash flow model included estimated production, forward coal prices, operating expenses, capital expenditures and a weighted average cost of capital.  Our forecasts of future cash flows considered market conditions at the time of the assessment and our estimate of the mine's performance in future years based on the information available to us. Key assumptions used in our valuation were not observable in active markets; therefore, the fair value measurements represent Level 3 fair value measurements.  The fair value of Hamilton was determined to be below its carrying amount (including goodwill) by more than the recorded balance of goodwill associated with the mine.  Accordingly, we recognized an impairment charge of $132.0 million consisting of the total carrying amount of goodwill associated with Hamilton.  This impairment charge reduced our consolidated goodwill balance to $4.4 million. During the first quarter of 2020, we also performed an interim test on ARLP's remaining goodwill balances not associated with Hamilton and concluded no impairment was necessary for our other reporting units.

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CONTINGENCIES

6 Months Ended

Jun. 30, 2021

CONTINGENCIES

CONTINGENCIES

4.CONTINGENCIES

We are party to litigation that has been initiated against certain of our subsidiaries in which the plaintiffs allege violations of the Fair Labor Standards Act and Kentucky Wage and Hour Act due to an alleged failure to compensate for time "donning" and "doffing" equipment and to account for certain bonuses in the calculation of overtime rates and pay.  The plaintiffs seek class or collective action certification.  Because the litigation of these matters is in the early stages, we cannot reasonably estimate a range of potential exposure at this time.  We believe the plaintiffs’ claims are without merit and our ultimate exposure, if any, will not be material to our results of operations or financial position and we intend to defend the litigation vigorously.  However, if our current belief that the claims are without merit is not upheld, it is reasonably possible that the ultimate resolution of these matters could result in a potential loss that may be material to our results of operations.

We also have various other lawsuits, claims and regulatory proceedings incidental to our business that are pending against the ARLP Partnership.  We record an accrual for a potential loss related to these matters when, in management's

opinion, such loss is probable and reasonably estimable.  Based on known facts and circumstances, we believe the ultimate outcome of these outstanding lawsuits, claims and regulatory proceedings will not have a material adverse effect on our financial condition, results of operations or liquidity.  However, if the results of these matters are different from management's current expectations and in amounts greater than our accruals, such matters could have a material adverse effect on our business and operations.

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INVENTORIES

6 Months Ended

Jun. 30, 2021

INVENTORIES

INVENTORIES

5.INVENTORIES

Inventories consist of the following:

	June 30,		December 31,
	2021		2020
	(in thousands)
Coal	$	40,091	$	19,756
Supplies (net of reserve for obsolescence of $5,548 and $5,547, respectively)		34,414		36,651
Total inventories, net	$	74,505	$	56,407

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FAIR VALUE MEASUREMENTS

6 Months Ended

Jun. 30, 2021

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

6.FAIR VALUE MEASUREMENTS

The following table summarizes our fair value measurements within the hierarchy not included elsewhere in these notes:

	June 30, 2021						December 31, 2020
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	(in thousands)
Long-term debt	$	—	$	479,993	$	—	$	—	$	518,317	$	—
Total	$	—	$	479,993	$	—	$	—	$	518,317	$	—

The carrying amounts for cash equivalents, accounts receivable, accounts payable, accrued and other liabilities approximate fair value due to the short maturity of those instruments.

The estimated fair value of our long-term debt, including current maturities, is based on interest rates that we believe are currently available to us in active markets for issuance of debt with similar terms and remaining maturities (See Note 7 – Long-Term Debt).  The fair value of debt, which is based upon these interest rates, is classified as a Level 2 measurement under the fair value hierarchy.

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LONG-TERM DEBT

6 Months Ended

Jun. 30, 2021

LONG-TERM DEBT

LONG-TERM DEBT

7.LONG-TERM DEBT

Long-term debt consists of the following:

					Unamortized Discount and
	Principal				Debt Issuance Costs
	June 30,		December 31,		June 30,		December 31,
	2021		2020		2021		2020
	(in thousands)
Revolving credit facility	$	—	$	87,500	$	(6,067)	$	(7,196)
Senior notes		400,000		400,000		(3,506)		(3,964)
Securitization facility		38,100		55,900		—		—
May 2019 equipment financing		3,256		4,956		—		—
November 2019 equipment financing		37,231		42,367		—		—
June 2020 equipment financing		11,357		13,057		—		—
Line of credit		1,830		—		—		—
		491,774		603,780		(9,573)		(11,160)
Less current maturities		(55,558)		(73,199)		—		—
Total long-term debt	$	436,216	$	530,581	$	(9,573)	$	(11,160)

Credit Facility.  On March 9, 2020, our Intermediate Partnership entered into a Fifth Amended and Restated Credit Agreement (the "Credit Agreement") with various financial institutions.  The Credit Agreement provides for a $459.5 million revolving credit facility, including a sublimit of $125 million for the issuance of letters of credit and a sublimit of $15.0 million for swingline borrowings (the "Revolving Credit Facility"), with a termination date of March 9, 2024.

The Credit Agreement is guaranteed by certain of our Intermediate Partnership's material direct and indirect subsidiaries (the "Restricted Subsidiaries") and is secured by substantially all the assets of the Restricted Subsidiaries.  The Credit Agreement is also guaranteed by Alliance Minerals but the oil and gas minerals assets of Alliance Minerals and its direct and indirect subsidiaries (collectively with Alliance Minerals, the "Unrestricted Subsidiaries") are not collateral under the Credit Agreement.  Borrowings under the Revolving Credit Facility bear interest, at our option, at either (i) the Base Rate at the greater of three benchmarks or (ii) a Eurodollar Rate, plus margins for (i) or (ii), as applicable, that fluctuate depending upon the ratio of Consolidated Debt to Consolidated Cash Flow (each as defined in the Credit Agreement).  The Eurodollar Rate, with applicable margin, under the Revolving Credit Facility was 2.71% as of June 30, 2021.  On June 30, 2021, we had $21.8 million of letters of credit outstanding with $437.7 million available for borrowing under the Revolving Credit Facility. We incur an annual commitment fee of 0.35% on the undrawn portion of the Revolving Credit Facility.  We utilize the Revolving Credit Facility, as appropriate, for working capital requirements, capital expenditures and investments, scheduled debt payments and distribution payments.  

The Credit Agreement contains various restrictions affecting the Intermediate Partnership and its Restricted Subsidiaries including, among other things, restrictions on incurrence of additional indebtedness and liens, sale of assets, investments, mergers and consolidations and transactions with affiliates, including transactions with Unrestricted Subsidiaries.  In each case, these restrictions are subject to various exceptions.  In addition, the payment of cash distributions is restricted if such payment would result in a fixed charge coverage ratio of less than 1.0 to 1.0 (as defined in the Credit Agreement) for the four most recently ended fiscal quarters.  The Credit Agreement requires the Intermediate Partnership to maintain (a) a debt to cash flow ratio of not more than 2.5 to 1.0, (b) a cash flow to interest expense ratio of not less than 3.0 to 1.0 and (c) a first lien debt to cash flow ratio of not more than 1.5 to 1.0, in each case, during the four most recently ended fiscal quarters. The debt to cash flow ratio, cash flow to interest expense ratio and first lien debt to cash flow ratio were 1.08 to 1.0, 10.66 to 1.0 and 0.20 to 1.0, respectively, for the trailing twelve months ended June 30, 2021.  We remained in compliance with the covenants of the Credit Agreement as of June 30, 2021 and anticipate remaining in compliance with the covenants.  

Senior Notes.  On April 24, 2017, the Intermediate Partnership and Alliance Resource Finance Corporation (as co-issuer), a wholly owned subsidiary of the Intermediate Partnership ("Alliance Finance"), issued an aggregate principal amount of $400.0 million of senior unsecured notes due 2025 ("Senior Notes") in a private placement to qualified institutional buyers.  The Senior Notes have a term of eight years, maturing on May 1, 2025 (the "Term") and accrue interest at an annual rate of 7.5%.  Interest is payable semi-annually in arrears on each May 1 and November 1.  The

indenture governing the Senior Notes contains customary terms, events of default and covenants relating to, among other things, the incurrence of debt, the payment of distributions or similar restricted payments, undertaking transactions with affiliates and limitations on asset sales.  The issuers of the Senior Notes may redeem all or a part of the notes at any time at redemption prices set forth in the indenture governing the Senior Notes.    

Accounts Receivable Securitization.  On December 5, 2014, certain direct and indirect wholly owned subsidiaries of our Intermediate Partnership entered into a $100.0 million accounts receivable securitization facility ("Securitization Facility").  Under the Securitization Facility, certain subsidiaries sell certain trade receivables on an ongoing basis to our Intermediate Partnership, which then sells the trade receivables to AROP Funding, LLC ("AROP Funding"), a wholly owned bankruptcy-remote special purpose subsidiary of our Intermediate Partnership, which in turn borrows on a revolving basis up to $100.0 million secured by the trade receivables.  After the sale, Alliance Coal, as servicer of the assets, collects the receivables on behalf of AROP Funding.  The Securitization Facility bears interest based on a Eurodollar Rate.  The agreement governing the Securitization Facility contains customary terms and conditions, including limitations with regards to certain customer credit ratings.  In January 2021, we extended the term of the Securitization Facility to January 2022 and reduced the borrowing availability under the facility to $60.0 million.  The Securitization Facility was previously scheduled to mature in January 2021.  On June 30, 2021, we had a $38.1 million outstanding balance under the Securitization Facility.  

May 2019 Equipment Financing.  On May 17, 2019, the Intermediate Partnership entered into an equipment financing arrangement accounted for as debt, wherein the Intermediate Partnership received $10.0 million in exchange for conveying its interest in certain equipment owned indirectly by the Intermediate Partnership and entering into a master lease agreement for that equipment (the "May 2019 Equipment Financing"). The May 2019 Equipment Financing contains customary terms and events of default and provides for thirty-six monthly payments with an implicit interest rate of 6.25%, maturing on May 1, 2022. Upon maturity, the equipment will revert to the Intermediate Partnership.

November 2019 Equipment Financing.  On November 6, 2019, the Intermediate Partnership entered into an equipment financing arrangement accounted for as debt, wherein the Intermediate Partnership received $53.1 million in exchange for conveying its interest in certain equipment owned indirectly by the Intermediate Partnership and entering into a master lease agreement for that equipment (the "November 2019 Equipment Financing").  The November 2019 Equipment Financing contains customary terms and events of default and an implicit interest rate of 4.75%, providing for a four-year term with forty-seven monthly payments of $1.0 million and a balloon payment of $11.6 million upon maturity on November 6, 2023.  Upon maturity, the equipment will revert to the Intermediate Partnership.  

June 2020 Equipment Financing.  On June 5, 2020, the Intermediate Partnership entered into an equipment financing arrangement accounted for as debt, wherein the Intermediate Partnership received $14.7 million in exchange for conveying its interest in certain equipment owned indirectly by the Intermediate Partnership and entering into a master lease agreement for that equipment (the "June 2020 Equipment Financing"). The June 2020 Equipment Financing contains customary terms and events of default and provides for forty-eight monthly payments with an implicit interest rate of 6.1%, maturing on June 5, 2024. Upon maturity, the equipment will revert to the Intermediate Partnership.

Line of Credit.  On February 19, 2021, we entered into a line of credit arrangement with a related party for $5.0 million.  The line of credit has a maturity date of February 28, 2023, with an option to extend it for an additional six months and accrue interest at an annual rate of 3.50%.  Interest is payable quarterly commencing March 31, 2021, and continuing each March 31, June 30, September 30 and December 31 thereafter through and including February 28, 2023.  The agreement contains customary terms and events of default and is guaranteed by ARLP.  We utilize the line of credit, as appropriate, for capital expenditures and investments.  As of June 30, 2021, we had drawn $1.8 million under this agreement.

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VARIABLE INTEREST ENTITIES

6 Months Ended

Jun. 30, 2021

VARIABLE INTEREST ENTITIES

VARIABLE INTEREST ENTITIES

8.VARIABLE INTEREST ENTITIES

Cavalier Minerals

On November 10, 2014, our subsidiary, Alliance Minerals, and Bluegrass Minerals Management, LLC ("Bluegrass Minerals") entered into a limited liability company agreement (the "Cavalier Agreement") to create Cavalier Minerals JV, LLC ("Cavalier Minerals"), which was formed to indirectly acquire oil & gas mineral interests through its ownership in AllDale Minerals LP ("AllDale I") and AllDale Minerals II, LP ("AllDale II", and collectively with AllDale I, "AllDale I & II").  Alliance Minerals owns a 96% member interest in Cavalier Minerals, and Bluegrass Minerals owns a 4% member interest in Cavalier Minerals and a profits interest which entitles it to receive distributions equal to 25% of all distributions (including in liquidation) after all members have recovered their investment.  Distributions with respect to Bluegrass Minerals' profits interest will be offset by all distributions received by Bluegrass Minerals from the former general partners of AllDale I & II.  To date, there has been no profits interest distribution.  We hold the managing member interest in Cavalier Minerals.  Total contributions to and cumulative distributions from Cavalier Minerals are as follows:  

	Alliance		Bluegrass
	Minerals		Minerals
	(in thousands)
Contributions	$	143,112	$	5,963
Distributions		98,107		4,087

We have concluded that Cavalier Minerals is a variable interest entity ("VIE") which we consolidate as the primary beneficiary because we are the managing member and a substantial equity owner in Cavalier Minerals.  Bluegrass Minerals' equity ownership of Cavalier Minerals is accounted for as noncontrolling ownership interest in our condensed consolidated balance sheets.  In addition, earnings attributable to Bluegrass Minerals are recognized as noncontrolling interest in our condensed consolidated statements of income.

AllDale III

In February 2017, Alliance Minerals committed to directly invest $30.0 million in AllDale Minerals III, LP ("AllDale III") which was created for similar investment purposes as AllDale I & II.  Alliance Minerals completed funding of this commitment in 2018. Alliance Minerals' limited partner interest in AllDale III is 13.9%.

The AllDale III Partnership Agreement includes a 25% profits interest for the general partner, subject to a return hurdle equal to the greater of 125% of cumulative capital contributions and a 10% internal rate of return, and following an 80/20 "catch-up" provision for the general partner.  

Since AllDale III is structured as a limited partnership with the limited partners 1) not having the ability to remove the general partner and 2) not participating significantly in the operational decisions, we concluded that AllDale III is a VIE.  We are not the primary beneficiary of AllDale III as we do not have the power to direct the activities that most significantly impact AllDale III's economic performance.  We account for our ownership interest in the income or loss of AllDale III as an equity method investment.  We record equity income or loss based on AllDale III's distribution structure. See Note 9 – Investment for more information.

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INVESTMENT

6 Months Ended

Jun. 30, 2021

INVESTMENT

INVESTMENT

9.INVESTMENT

AllDale III

As discussed in Note 8 – Variable Interest Entities, we account for our ownership interest in the income or loss of AllDale III as an equity method investment.  We record equity income or loss based on AllDale III's distribution structure.  The changes in our equity method investment in AllDale III for each of the periods presented were as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Beginning balance	$	26,907	$	28,114	$	27,268	$	28,529
Equity method investment income		341		137		403		588
Distributions received		(974)		(546)		(1,397)		(1,139)
Other		—		—		—		(273)
Ending balance	$	26,274	$	27,705	$	26,274	$	27,705

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PARTNERS' CAPITAL

6 Months Ended

Jun. 30, 2021

PARTNERS' CAPITAL

PARTNERS' CAPITAL

10.PARTNERS' CAPITAL

Distributions

Distributions paid or declared during 2020 and 2021 were as follows:

Payment Date	Per Unit Cash Distribution		Total Cash Distribution
			(in thousands)
February 14, 2020	$	0.4000	$	51,753
Total	$	0.4000	$	51,753
May 14, 2021	$	0.1000	$	13,045
August 13, 2021 (1)		0.1000		—
Total	$	0.2000	$	13,045

(1) On July 26, 2021, we declared this quarterly distribution payable on August 13, 2021 to all unitholders of record as of August 6, 2021.  

Unit Repurchase Program

In May 2018, the MGP board of directors approved the establishment of a unit repurchase program authorizing us to repurchase and retire up to $100 million of ARLP common units.  The program has no time limit and we may repurchase units from time to time in the open market or in other privately negotiated transactions. The unit repurchase program authorization does not obligate us to repurchase any dollar amount or number of units.  No unit repurchases were made during the six months ended June 30, 2021.  Since inception of the unit repurchase program, we have repurchased and retired 5,460,639 units at an average unit price of $17.12 for an aggregate purchase price of $93.5 million. The remaining authorized amount for unit repurchases under this program is $6.5 million.

Change in Partners' Capital

The following tables present the quarterly change in Partners' Capital for the six months ended June 30, 2021 and 2020:

				Accumulated
	Number of	Limited		Other
	Limited Partner	Partners'		Comprehensive		Noncontrolling		Total Partners'
	Units	Capital		Income (Loss)		Interest		Capital
	(in thousands, except unit data)
Balance at January 1, 2021	127,195,219	$	1,148,565	$	(87,674)	$	11,376	$	1,072,267
Comprehensive income:
Net income	—		24,748		—		78		24,826
Actuarially determined long-term liability adjustments	—		—		2,231		—		2,231
Total comprehensive income									27,057
Common unit-based compensation	—		723		—		—		723
Distributions from consolidated company to noncontrolling interest	—		—		—		(141)		(141)
Balance at March 31, 2021	127,195,219		1,174,036		(85,443)		11,313		1,099,906
Comprehensive income:
Net income	—		44,035		—		130		44,165
Actuarially determined long-term liability adjustments	—		—		2,231		—		2,231
Total comprehensive income									46,396
Common unit-based compensation	—		1,485		—		—		1,485
Distributions on deferred common unit-based compensation	—		(324)		—		—		(324)
Distributions from consolidated company to noncontrolling interest	—		—		—		(222)		(222)
Distributions to Partners	—		(12,721)		—		—		(12,721)
Balance at June 30, 2021	127,195,219	$	1,206,511	$	(83,212)	$	11,221	$	1,134,520

				Accumulated
	Number of	Limited		Other
	Limited Partner	Partners'		Comprehensive		Noncontrolling		Total Partners'
	Units	Capital		Income (Loss)		Interest		Capital
	(in thousands, except unit data)
Balance at January 1, 2020	126,915,597	$	1,331,482	$	(77,993)	$	11,935	$	1,265,424
Comprehensive income (loss):
Net income (loss)	—		(144,783)		—		76		(144,707)
Actuarially determined long-term liability adjustments	—		—		938		—		938
Total comprehensive loss									(143,769)
Settlement of deferred compensation plans	279,622		(1,310)		—		—		(1,310)
Common unit-based compensation	—		(527)		—		—		(527)
Distributions on deferred common unit-based compensation	—		(986)		—		—		(986)
Distributions from consolidated company to noncontrolling interest	—		—		—		(288)		(288)
Distributions to Partners	—		(50,767)		—		—		(50,767)
Other	—		(273)		—		—		(273)
Balance at March 31, 2020	127,195,219		1,132,836		(77,055)		11,723		1,067,504
Comprehensive income (loss):
Net loss	—		(46,664)		—		(15)		(46,679)
Actuarially determined long-term liability adjustments	—		—		939		—		939
Total comprehensive loss									(45,740)
Common unit-based compensation	—		1,610		—		—		1,610
Distributions from consolidated company to noncontrolling interest	—		—		—		(222)		(222)
Balance at June 30, 2020	127,195,219	$	1,087,782	$	(76,116)	$	11,486	$	1,023,152

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REVENUE FROM CONTRACTS WITH CUSTOMERS

6 Months Ended

Jun. 30, 2021

REVENUE FROM CONTRACTS WITH CUSTOMERS

REVENUE FROM CONTRACTS WITH CUSTOMERS

11.REVENUE FROM CONTRACTS WITH CUSTOMERS

The following table illustrates the disaggregation of our revenues by type, including a reconciliation to our segment presentation as presented in Note 16 – Segment Information.

	Coal Operations				Royalties
	Illinois								Other and
	Basin		Appalachia		Oil & Gas		Coal		Corporate		Elimination		Consolidated
	(in thousands)
Three Months Ended June 30, 2021
Coal sales	$	210,157	$	115,817	$	—	$	—	$	—	$	—	$	325,974
Oil & gas royalties		—		—		17,114		—		—		—		17,114
Coal royalties		—		—		—		11,653		—		(11,653)		—
Transportation revenues		7,434		4,624		—		—		—		—		12,058
Other revenues		642		282		473		—		8,547		(2,647)		7,297
Total revenues	$	218,233	$	120,723	$	17,587	$	11,653	$	8,547	$	(14,300)	$	362,443
Three Months Ended June 30, 2020
Coal sales	$	134,160	$	102,126	$	—	$	—	$	—	$	—	$	236,286
Oil & gas royalties		—		—		7,786		—		—		—		7,786
Coal royalties		—		—		—		6,778		—		(6,778)		0
Transportation revenues		3,153		2,604		—		—		—		—		5,757
Other revenues		474		2,380		61		—		4,955		(2,497)		5,373
Total revenues	$	137,787	$	107,110	$	7,847	$	6,778	$	4,955	$	(9,275)	$	255,202
Six Months Ended June 30, 2021
Coal sales	$	392,798	$	220,663	$	—	$	—	$	—	$	—	$	613,461
Oil & gas royalties		—		—		31,113		—		—		—		31,113
Coal royalties		—		—		—		22,954		—		(22,954)		—
Transportation revenues		15,114		8,012		—		—		—		—		23,126
Other revenues		1,255		667		494		—		16,315		(5,366)		13,365
Total revenues	$	409,167	$	229,342	$	31,607	$	22,954	$	16,315	$	(28,320)	$	681,065
Six Months Ended June 30, 2020
Coal sales	$	333,258	$	217,665	$	—	$	—	$	—	$	—	$	550,923
Oil & gas royalties		—		—		22,025		—		—		—		22,025
Coal royalties		—		—		—		18,149		—		(18,149)		—
Transportation revenues		7,009		3,487		—		—		—		—		10,496
Other revenues		1,392		14,061		85		5		12,334		(5,356)		22,521
Total revenues	$	341,659	$	235,213	$	22,110	$	18,154	$	12,334	$	(23,505)	$	605,965

The following table illustrates the amount of our transaction price for all current coal supply contracts allocated to performance obligations that are unsatisfied or partially unsatisfied as of June 30, 2021 and disaggregated by segment and contract duration.

							2024 and
	2021		2022		2023		Thereafter		Total
	(in thousands)
Illinois Basin Coal Operations coal revenues	$	446,385	$	305,362	$	238,070	$	201,875	$	1,191,692
Appalachia Coal Operations coal revenues		218,512		183,520		17,880		10,080		429,992
Total coal revenues (1)	$	664,897	$	488,882	$	255,950	$	211,955	$	1,621,684

(1) Coal revenues generally consists of consolidated revenues excluding our Oil & Gas Royalties segment as well as intercompany revenues from our Coal Royalties segment.

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EARNINGS PER LIMITED PARTNER UNIT

6 Months Ended

Jun. 30, 2021

EARNINGS PER LIMITED PARTNER UNIT

EARNINGS PER LIMITED PARTNER UNIT

12.EARNINGS PER LIMITED PARTNER UNIT

We utilize the two-class method in calculating basic and diluted earnings per limited partner unit ("EPU").  Net income attributable to ARLP is allocated to limited partners and participating securities under deferred compensation plans, which include rights to nonforfeitable distributions or distribution equivalents.  Net losses attributable to ARLP are allocated to limited partners but not to participating securities.  Our participating securities are outstanding restricted unit awards under our Long-Term Incentive Plan ("LTIP") and phantom units in notional accounts under our Supplemental Executive Retirement Plan ("SERP") and the MGP Amended and Restated Deferred Compensation Plan for Directors ("Directors' Deferred Compensation Plan").

The following is a reconciliation of net income (loss) attributable to ARLP used for calculating basic and diluted earnings per unit and the weighted-average units used in computing EPU for the three and six months ended June 30, 2021 and 2020:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands, except per unit data)
Net income (loss) attributable to ARLP	$	44,035	$	(46,664)	$	68,783	$	(191,447)
Less:
Distributions to participating securities		(401)		—		(619)		—
Undistributed earnings attributable to participating securities		(825)		—		(934)		—
Net income (loss) attributable to ARLP available to limited partners	$	42,809	$	(46,664)	$	67,230	$	(191,447)
Weighted-average limited partner units outstanding – basic and diluted		127,195		127,195		127,195		127,134
Earnings per limited partner unit - basic and diluted (1)	$	0.34	$	(0.37)	$	0.53	$	(1.51)

(1) Diluted EPU gives effect to all potentially dilutive common units outstanding during the period using the treasury stock method. Diluted EPU excludes all potentially dilutive units calculated under the treasury stock method if their effect is anti-dilutive.  The combined total of LTIP, SERP and Directors' Deferred Compensation Plan units of 1,525 and 1,397 for the three and six months ended June 30, 2021, respectively, and 661 and 654 for the three and six months ended June 30, 2020, respectively, were considered anti-dilutive under the treasury stock method.

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WORKERS' COMPENSATION AND PNEUMOCONIOSIS

6 Months Ended

Jun. 30, 2021

WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS

WORKERS' COMPENSATION AND PNEUMOCONIOSIS

13.WORKERS' COMPENSATION AND PNEUMOCONIOSIS

The changes in the workers' compensation liability, including current and long-term liability balances, for each of the periods presented were as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Beginning balance	$	54,233	$	52,880	$	54,739	$	53,384
Accruals increase		1,565		192		3,237		1,940
Payments		(2,565)		(1,992)		(4,975)		(4,563)
Interest accretion		231		320		463		639
Valuation loss (gain) (1)		(1,405)		3,078		(1,405)		3,078
Ending balance	$	52,059	$	54,478	$	52,059	$	54,478

(1) Our estimate of the liability for the present value of current workers′ compensation benefits is based on our actuarial calculations.  Our actuarial calculations are based on a blend of actuarial projection methods and numerous assumptions including claims development patterns, mortality, medical costs and interest rates.  The valuation gain in 2021 is due to an increase in the discount rate from 1.95% on December 31, 2020 to 2.34% on June 30, 2021. We conducted a mid-year 2020 review of our actuarial assumptions, which resulted in a valuation loss in 2020 due to unfavorable changes in claims development and a decrease in the discount rate from 2.81% on December 31, 2019 to 2.05% on June 30, 2020.

We limit our exposure to traumatic injury claims by purchasing a high deductible insurance policy that starts paying benefits after deductibles for a claim have been met.  The deductible level may vary by claim year.  Our workers' compensation liability above is presented on a gross basis and does not include our expected receivables on our insurance policy.  Our receivables for traumatic injury claims under this policy as of June 30, 2021 are $7.1 million and are included in Other long-term assets on our condensed consolidated balance sheet.

Certain of our mine operating entities are liable under state statutes and the Federal Coal Mine Health and Safety Act of 1969, as amended, to pay pneumoconiosis, or black lung, benefits to eligible employees and former employees and their dependents.  Components of the net periodic benefit cost for each of the periods presented are as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Service cost	$	989	$	883	$	2,020	$	1,761
Interest cost (1)		637		749		1,273		1,499
Net amortization (1)		1,043		(171)		2,086		(343)
Net periodic benefit cost	$	2,669	$	1,461	$	5,379	$	2,917

(1) Interest cost and net amortization are included in the Other expense line item within our condensed consolidated statements of income.

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COMMON UNIT-BASED COMPENSATION PLANS

6 Months Ended

Jun. 30, 2021

COMMON UNIT-BASED COMPENSATION PLANS

COMMON UNIT-BASED COMPENSATION PLANS

14.COMMON UNIT-BASED COMPENSATION PLANS

Long-Term Incentive Plan

We maintain the LTIP for certain employees and officers of MGP and its affiliates who perform services for us.  As part of our LTIP, unit awards of non-vested "phantom" or notional units, also referred to as "restricted units", may be granted which upon satisfaction of time and performance-based vesting requirements, entitle the LTIP participant to receive ARLP common units.  Certain awards may also contain a minimum-value guarantee payable in ARLP common units or cash that would be paid regardless of whether or not the awards vest, as long as service requirements are met.  Annual grant levels, vesting provisions and minimum-value guarantees of restricted units for designated participants are recommended by Mr. Craft, subject to review and approval of the compensation committee of the MGP board of directors (the "Compensation Committee").  Vesting of all restricted units outstanding is subject to the satisfaction of certain financial tests. If it is not probable the financial tests for a particular grant of restricted units will be met, any previously expensed amounts for that grant are reversed and no future expense will be recognized for that grant.  Assuming the financial tests are met, grants of restricted units issued to LTIP participants are generally expected to cliff vest on January 1st of the third year following issuance of the grants.  We expect to settle restricted unit grants by delivery of newly-issued ARLP common units, except for the portion of the grants that will satisfy employee tax withholding obligations of LTIP participants.  We account for forfeitures of non-vested LTIP restricted unit grants as they occur.  As provided under the distribution equivalent rights ("DERs") provisions of the LTIP and the terms of the LTIP restricted unit awards, all non-vested restricted units include contingent rights to receive quarterly distributions in cash or, at the discretion of the Compensation Committee, phantom units in lieu of cash credited to a bookkeeping account with value equal to the cash distributions we make to unitholders during the vesting period. If it is not probable the financial tests for a particular grant of restricted units will be met, any previously paid DER amounts for that grant are reversed from Partners’ Capital and recorded as compensation expense and any future DERs, for that grant, if any, will be recognized as compensation expense when paid.  

A summary of non-vested LTIP grants as of and for the six months ended June 30, 2021 is as follows:

	Number of units	Weighted average grant date fair value per unit		Intrinsic value
				(in thousands)
Non-vested grants at January 1, 2021	1,430,489	$	5.02	$	6,409
Granted (1)	1,818,190		6.03
Forfeited	(8,152)		5.02
Non-vested grants at June 30, 2021	3,240,527		5.59		23,364

(1) 921,430 units and 896,760 units have a minimum-value guarantee of $2.53 and $3.79 per unit, respectively, regardless of whether or not the awards vest.

LTIP expense for grants of restricted units was $1.4 million and $1.6 million for the three months ended June 30, 2021 and 2020, respectively, and $2.1 million and $0.9 million for the six months ended June 30, 2021 and 2020, respectively.  LTIP expense for grants of restricted units for the six months ended June 30, 2020 includes the reversal of $4.8 million of cumulative previously recognized expense for the 2019 Grants, which were determined to be not probable of vesting, offset in part by related DERs for the 2019 Grants previously recorded to equity and then expensed.  

The total obligation associated with LTIP grants of restricted units as of June 30, 2021 was $3.5 million and is included in the partners' capital Limited partners-common unitholders line item in our condensed consolidated balance sheets.  As of June 30, 2021, there was $14.6 million in total unrecognized compensation expense related to the non-vested LTIP restricted unit grants that are expected to vest.  That expense is expected to be recognized over a weighted-average period of 2.1 years.

Supplemental Executive Retirement Plan and Directors' Deferred Compensation Plan

We utilize the SERP to provide deferred compensation benefits for certain officers and key employees. All allocations made to participants under the SERP are made in the form of "phantom" ARLP units and SERP distributions will be settled in the form of ARLP common units.  The SERP is administered by the Compensation Committee.  

Our directors participate in the Directors' Deferred Compensation Plan. Pursuant to the Directors' Deferred Compensation Plan, for amounts deferred either automatically or at the election of the director, a notional account is established and credited with notional common units of ARLP, described in the Directors' Deferred Compensation Plan as "phantom" units.  Distributions from the Directors' Deferred Compensation Plan will be settled in the form of ARLP common units.

For both the SERP and Directors' Deferred Compensation Plan, when quarterly cash distributions are made with respect to ARLP common units, an amount equal to such quarterly distribution is credited to each participant's notional account as additional phantom units.  All grants of phantom units under the SERP and Directors' Deferred Compensation Plan vest immediately.

A summary of SERP and Directors' Deferred Compensation Plan activity as of and for the six months ended June 30, 2021 is as follows:

	Number of units	Weighted average grant date fair value per unit		Intrinsic value
				(in thousands)
Phantom units outstanding as of January 1, 2021	760,630	$	22.04	$	3,408
Granted	12,942		5.99
Phantom units outstanding as of June 30, 2021	773,572		21.77		5,577

Total SERP and Directors' Deferred Compensation Plan expense was $0.1 million for the three months ended June 30, 2021 and 2020, and $0.2 million and $0.4 million for the six months ended June 30, 2021, and 2020, respectively.  As of June 30, 2021, the total obligation associated with the SERP and Directors' Deferred Compensation Plan was $16.8 million and is included in the partners' capital Limited partners-common unitholders line item in our condensed consolidated balance sheets.

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COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS

6 Months Ended

Jun. 30, 2021

COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS

COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS

15.COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS

Eligible employees at certain of our mining operations participate in a defined benefit plan (the "Pension Plan") that we sponsor.  The Pension Plan is currently closed to new applicants and participants in the Pension Plan are no longer receiving benefit accruals for service.  The benefit formula for the Pension Plan is a fixed dollar unit based on years of service.  Components of the net periodic benefit cost for each of the periods presented are as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Interest cost	$	860	$	1,054	$	1,720	$	2,108
Expected return on plan assets		(1,671)		(1,491)		(3,342)		(2,983)
Amortization of prior service cost		46		47		93		93
Amortization of net loss		1,142		1,063		2,283		2,127
Net periodic benefit cost (1)	$	377	$	673	$	754	$	1,345

(1) Net periodic benefit cost for the Pension Plan is included in the Other expense line item within our condensed consolidated statements of income.

During the six months ended June 30, 2021, we made contribution payments totaling $3.3 million to the Pension Plan for the 2020 plan year.  As a result of certain pension plan contribution relief provided by the American Rescue Plan Act enacted in March 2021, we do not expect to make additional contributions to the Pension Plan during 2021 or 2022.

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SEGMENT INFORMATION

6 Months Ended

Jun. 30, 2021

SEGMENT INFORMATION

SEGMENT INFORMATION

16.SEGMENT INFORMATION

We operate in the United States as a diversified natural resource company that generates operating and royalty income from the production and marketing of coal to major domestic and international utilities and industrial users as well as royalty income from oil & gas mineral interests.  We aggregate multiple operating segments into four reportable segments, Illinois Basin Coal Operations, Appalachia Coal Operations, Oil & Gas Royalties and Coal Royalties.  We also have an "all other" category referred to as Other and Corporate.

Our two coal operations reportable segments correspond to major coal producing regions in the eastern United States with similar economic characteristics including coal quality, geology, coal marketing opportunities, mining and transportation methods and regulatory issues.  The two coal operations reportable segments include seven mining complexes operating in Illinois, Indiana, Kentucky, Maryland, Pennsylvania and West Virginia and a coal loading terminal in Indiana on the Ohio River.  Our Oil & Gas Royalties reportable segment includes our oil & gas mineral interests which are located primarily in the Permian (Delaware and Midland), Anadarko (SCOOP/STACK), and Williston (Bakken) basins. The operations within our Oil & Gas Royalties reportable segment primarily include receiving royalties and lease bonuses for our oil & gas mineral interests. Our Coal Royalties reportable segment includes coal reserves controlled by Alliance Resource Properties, which are either (a) leased to certain of our coal mining entities or (b) unleased but near our coal mining operations.

Beginning in the first quarter of 2021, we began to strategically view and manage our coal royalty activities separately from our coal mining operations since acquiring and managing a variety of royalty producing assets have similar management attributes.  As a result, we restructured our reportable segments to better reflect this strategic view in how we manage our business and allocate resources.  Prior periods have been recast to include Alliance Resource Properties within our new Coal Royalties reportable segment with offsetting recast adjustments primarily to our coal operations reportable segments and to a lesser extent, our Other and Corporate category.  Our reported eliminations were recast also to reflect intercompany royalty revenues and offsetting intercompany royalty expense resulting from our new Coal Royalties reportable segment.

The Illinois Basin Coal Operations reportable segment includes currently operating mining complexes (a) the Gibson County Coal, LLC ("Gibson") mining complex, which includes the Gibson South mine, (b) the Warrior Coal, LLC ("Warrior") mining complex, (c) the River View Coal, LLC ("River View") mining complex and (d) the Hamilton mining complex. The Illinois Basin Coal Operations reportable segment also includes our currently operating Mt. Vernon Transfer Terminal, LLC ("Mt. Vernon") coal loading terminal in Indiana on the Ohio River.   Our Coal Royalties reportable segment discussed below, controls other coal reserves near our Illinois Basin operations which have not yet been leased to our Illinois Basin mining entities.

The Illinois Basin Coal Operations reportable segment also includes Mid-America Carbonates, LLC ("MAC") and other support services as well as non-operating mining complexes including (a) the Gibson North mine, which ceased production in the fourth quarter of 2019, (b) Webster County Coal, LLC's Dotiki mining complex, (c) White County Coal, LLC's Pattiki mining complex, (d) Hopkins County Coal, LLC's mining complex, and (e) Sebree Mining, LLC's mining complex.

The Appalachia Coal Operations reportable segment includes currently operating mining complexes (a) the Mettiki mining complex, (b) the Tunnel Ridge, LLC mining complex and (c) the MC Mining, LLC ("MC Mining") mining complex. The Mettiki mining complex includes Mettiki Coal (WV), LLC's Mountain View mine and Mettiki Coal, LLC's preparation plant. Our Coal Royalties reportable segment discussed below, controls the Penn Ridge coal reserves near our Tunnel Ridge operations which have not yet been leased to Tunnel Ridge.  

The Oil & Gas Royalties reportable segment includes oil & gas mineral interests held by AR Midland, LP and AllDale I & II and includes Alliance Minerals' equity interests in both AllDale III (Note 9 – Investment) and Cavalier Minerals.

The Coal Royalties reportable segment includes coal reserves controlled by Alliance Resource Properties, that are either (a) leased to certain of our mining complexes in both the Illinois Basin Coal Operations and Appalachia Coal Operations reportable segments or (b) near our coal mining operations but not yet leased to our coal mining entities. About two thirds of the coal sold by our Coal Operations' mines is leased from our Coal Royalties entities.

Other and Corporate includes marketing and administrative activities, Matrix Design Group, LLC and its subsidiaries ("Matrix Design"), Alliance Design Group, LLC ("Alliance Design") (collectively, Matrix Design and Alliance Design referred to as the "Matrix Group"), Pontiki Coal, LLC's workers' compensation and pneumoconiosis liabilities, Wildcat Insurance, LLC ("Wildcat Insurance"), which assists the ARLP Partnership with its insurance requirements, and AROP Funding and Alliance Finance (both discussed in Note 7 – Long-Term Debt).

Reportable segment results are presented below.

	Coal Operations				Royalties
	Illinois								Other and		Elimination
	Basin		Appalachia		Oil & Gas		Coal		Corporate		(1)		Consolidated
	(in thousands)
Three Months Ended June 30, 2021
Revenues - Outside	$	218,233	$	120,723	$	17,587	$	—	$	5,900	$	—	$	362,443
Revenues - Intercompany		—		—		—		11,653		2,647		(14,300)		—
Total revenues (2)		218,233		120,723		17,587		11,653		8,547		(14,300)		362,443
Segment Adjusted EBITDA Expense (3)		140,176		74,456		2,419		4,871		4,825		(12,243)		214,504
Segment Adjusted EBITDA (4)		70,623		41,641		15,379		6,782		3,724		(2,057)		136,092
Capital expenditures		12,515		10,382		—		—		1,292		—		24,189
Three Months Ended June 30, 2020
Revenues - Outside	$	137,787	$	107,110	$	7,847	$	—	$	2,458	$	—	$	255,202
Revenues - Intercompany		—		—		—		6,778		2,497		(9,275)		—
Total revenues (2)		137,787		107,110		7,847		6,778		4,955		(9,275)		255,202
Segment Adjusted EBITDA Expense (3)		111,967		74,227		1,119		3,021		4,147		(6,940)		187,541
Segment Adjusted EBITDA (4)		22,667		30,279		6,881		3,757		807		(2,335)		62,056
Capital expenditures		14,029		19,686		—		—		166		—		33,881
Six Months Ended June 30, 2021
Revenues - Outside	$	409,167	$	229,342	$	31,607	$	—	$	10,949	$	—	$	681,065
Revenues - Intercompany		—		—		—		22,954		5,366		(28,320)		—
Total revenues (2)		409,167		229,342		31,607		22,954		16,315		(28,320)		681,065
Segment Adjusted EBITDA Expense (3)		265,757		148,182		4,477		8,899		9,111		(24,205)		412,221
Segment Adjusted EBITDA (4)		128,296		73,147		27,325		14,055		7,205		(4,115)		245,913
Total assets		726,555		425,574		604,355		292,134		489,271		(422,376)		2,115,513
Capital expenditures		28,916		22,048		—		—		4,662		—		55,626
Six Months Ended June 30, 2020
Revenues - Outside	$	341,659	$	235,213	$	22,110	$	5	$	6,978	$	—	$	605,965
Revenues - Intercompany		—		—		—		18,149		5,356		(23,505)		—
Total revenues (2)		341,659		235,213		22,110		18,154		12,334		(23,505)		605,965
Segment Adjusted EBITDA Expense (3)		268,650		154,145		2,002		7,488		8,789		(18,835)		422,239
Segment Adjusted EBITDA (4)		66,000		77,581		20,636		10,666		3,544		(4,670)		173,757
Total assets		814,972		492,073		628,308		294,435		473,119		(417,279)		2,285,628
Capital expenditures		40,258		43,257		—		—		730		—		84,245

(1) The elimination column represents the elimination of intercompany transactions and is primarily comprised of coal royalties paid by certain of our coal operation entities to Alliance Resource Properties, sales from the Matrix Group to our mining operations, coal sales and purchases between operations within different segments, sales of receivables to AROP Funding, financing between segments and insurance premiums paid to Wildcat Insurance.

(2) Revenues included in the Other and Corporate column are primarily attributable to the outside and affiliate revenues at the Matrix Group and coal brokerage activities.  In addition, Other and Corporate includes affiliate revenues from administrative and Wildcat Insurance revenues services.

(3) Segment Adjusted EBITDA Expense includes operating expenses, coal purchases and other income. Transportation expenses are excluded as transportation revenues are recognized in an amount equal to transportation expenses when title passes to the customer.  

The following is a reconciliation of consolidated Segment Adjusted EBITDA Expense to Operating expenses (excluding depreciation, depletion and amortization):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Segment Adjusted EBITDA Expense	$	214,504	$	187,541	$	412,221	$	422,239
Outside coal purchases		(114)		—		(114)		—
Other expense		(1,351)		(377)		(2,548)		(733)
Operating expenses (excluding depreciation, depletion and amortization)	$	213,039	$	187,164	$	409,559	$	421,506

(4) Segment Adjusted EBITDA is defined as net income (loss) attributable to ARLP before net interest expense, income taxes, depreciation, depletion and amortization, general and administrative expenses and asset and goodwill impairments.  Management therefore is able to focus solely on the evaluation of segment operating profitability as it relates to our revenues and operating expenses, which are primarily controlled by our segments.  Consolidated Segment Adjusted EBITDA is reconciled to net income as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Consolidated Segment Adjusted EBITDA	$	136,092	$	62,056	$	245,913	$	173,757
General and administrative		(17,492)		(13,822)		(32,996)		(27,260)
Depreciation, depletion and amortization		(64,733)		(83,559)		(123,935)		(157,480)
Asset impairments		—		—		—		(24,977)
Goodwill impairment		—		—		—		(132,026)
Interest expense, net		(9,827)		(11,416)		(20,206)		(23,643)
Income tax (expense) benefit		(5)		77		7		182
Net income (loss) attributable to ARLP	$	44,035	$	(46,664)	$	68,783	$	(191,447)
Noncontrolling interest		130		(15)		208		61
Net income (loss)	$	44,165	$	(46,679)	$	68,991	$	(191,386)

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SUBSEQUENT EVENTS

6 Months Ended

Jun. 30, 2021

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS

17.SUBSEQUENT EVENTS

Other than the event described in Note 10, there were no subsequent events.

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ORGANIZATION AND PRESENTATION (Policies)

6 Months Ended

Jun. 30, 2021

ORGANIZATION AND PRESENTATION

Basis of Presentation

Basis of Presentation

The accompanying condensed consolidated financial statements include the accounts and operations of the ARLP Partnership and present our financial position as of June 30, 2021 and December 31, 2020, the results of our operations and comprehensive income (loss) for the three and six months ended June 30, 2021 and 2020, and cash flows for the six months ended June 30, 2021 and 2020.  All intercompany transactions and accounts have been eliminated.

These condensed consolidated financial statements and notes are prepared pursuant to the rules and regulations of the Securities and Exchange Commission for interim reporting and do not include all the information normally included with financial statements prepared in accordance with generally accepted accounting principles ("GAAP") of the United States.  These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2020.

These condensed consolidated financial statements and notes are unaudited. However, in the opinion of management, these condensed consolidated financial statements reflect all normal recurring adjustments necessary for a fair presentation of the results for the periods presented.  Results for interim periods are not necessarily indicative of results to be expected for the full year ending December 31, 2021.

Use of Estimates

Use of Estimates

The preparation of the ARLP Partnership's condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts and disclosures in our condensed consolidated financial statements.  Actual results could differ from those estimates.

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INVENTORIES (Tables)

6 Months Ended

Jun. 30, 2021

INVENTORIES

Schedule of inventories

	June 30,		December 31,
	2021		2020
	(in thousands)
Coal	$	40,091	$	19,756
Supplies (net of reserve for obsolescence of $5,548 and $5,547, respectively)		34,414		36,651
Total inventories, net	$	74,505	$	56,407

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FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2021

FAIR VALUE MEASUREMENTS

Summary of fair value measurements within the hierarchy

	June 30, 2021						December 31, 2020
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	(in thousands)
Long-term debt	$	—	$	479,993	$	—	$	—	$	518,317	$	—
Total	$	—	$	479,993	$	—	$	—	$	518,317	$	—

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LONG-TERM DEBT (Tables)

6 Months Ended

Jun. 30, 2021

LONG-TERM DEBT

Schedule of long-term debt

					Unamortized Discount and
	Principal				Debt Issuance Costs
	June 30,		December 31,		June 30,		December 31,
	2021		2020		2021		2020
	(in thousands)
Revolving credit facility	$	—	$	87,500	$	(6,067)	$	(7,196)
Senior notes		400,000		400,000		(3,506)		(3,964)
Securitization facility		38,100		55,900		—		—
May 2019 equipment financing		3,256		4,956		—		—
November 2019 equipment financing		37,231		42,367		—		—
June 2020 equipment financing		11,357		13,057		—		—
Line of credit		1,830		—		—		—
		491,774		603,780		(9,573)		(11,160)
Less current maturities		(55,558)		(73,199)		—		—
Total long-term debt	$	436,216	$	530,581	$	(9,573)	$	(11,160)

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VARIABLE INTEREST ENTITIES (Tables)

6 Months Ended

Jun. 30, 2021

VARIABLE INTEREST ENTITIES

Schedule of distributions

	Alliance		Bluegrass
	Minerals		Minerals
	(in thousands)
Contributions	$	143,112	$	5,963
Distributions		98,107		4,087

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INVESTMENT (Tables)

6 Months Ended

Jun. 30, 2021

INVESTMENT

Schedule of changes in equity method investment

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Beginning balance	$	26,907	$	28,114	$	27,268	$	28,529
Equity method investment income		341		137		403		588
Distributions received		(974)		(546)		(1,397)		(1,139)
Other		—		—		—		(273)
Ending balance	$	26,274	$	27,705	$	26,274	$	27,705

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PARTNERS' CAPITAL (Tables)

6 Months Ended

Jun. 30, 2021

PARTNERS' CAPITAL

Summary of quarterly per unit distribution paid

Payment Date	Per Unit Cash Distribution		Total Cash Distribution
			(in thousands)
February 14, 2020	$	0.4000	$	51,753
Total	$	0.4000	$	51,753
May 14, 2021	$	0.1000	$	13,045
August 13, 2021 (1)		0.1000		—
Total	$	0.2000	$	13,045

Summary of changes to Partners' Capital

				Accumulated
	Number of	Limited		Other
	Limited Partner	Partners'		Comprehensive		Noncontrolling		Total Partners'
	Units	Capital		Income (Loss)		Interest		Capital
	(in thousands, except unit data)
Balance at January 1, 2021	127,195,219	$	1,148,565	$	(87,674)	$	11,376	$	1,072,267
Comprehensive income:
Net income	—		24,748		—		78		24,826
Actuarially determined long-term liability adjustments	—		—		2,231		—		2,231
Total comprehensive income									27,057
Common unit-based compensation	—		723		—		—		723
Distributions from consolidated company to noncontrolling interest	—		—		—		(141)		(141)
Balance at March 31, 2021	127,195,219		1,174,036		(85,443)		11,313		1,099,906
Comprehensive income:
Net income	—		44,035		—		130		44,165
Actuarially determined long-term liability adjustments	—		—		2,231		—		2,231
Total comprehensive income									46,396
Common unit-based compensation	—		1,485		—		—		1,485
Distributions on deferred common unit-based compensation	—		(324)		—		—		(324)
Distributions from consolidated company to noncontrolling interest	—		—		—		(222)		(222)
Distributions to Partners	—		(12,721)		—		—		(12,721)
Balance at June 30, 2021	127,195,219	$	1,206,511	$	(83,212)	$	11,221	$	1,134,520

				Accumulated
	Number of	Limited		Other
	Limited Partner	Partners'		Comprehensive		Noncontrolling		Total Partners'
	Units	Capital		Income (Loss)		Interest		Capital
	(in thousands, except unit data)
Balance at January 1, 2020	126,915,597	$	1,331,482	$	(77,993)	$	11,935	$	1,265,424
Comprehensive income (loss):
Net income (loss)	—		(144,783)		—		76		(144,707)
Actuarially determined long-term liability adjustments	—		—		938		—		938
Total comprehensive loss									(143,769)
Settlement of deferred compensation plans	279,622		(1,310)		—		—		(1,310)
Common unit-based compensation	—		(527)		—		—		(527)
Distributions on deferred common unit-based compensation	—		(986)		—		—		(986)
Distributions from consolidated company to noncontrolling interest	—		—		—		(288)		(288)
Distributions to Partners	—		(50,767)		—		—		(50,767)
Other	—		(273)		—		—		(273)
Balance at March 31, 2020	127,195,219		1,132,836		(77,055)		11,723		1,067,504
Comprehensive income (loss):
Net loss	—		(46,664)		—		(15)		(46,679)
Actuarially determined long-term liability adjustments	—		—		939		—		939
Total comprehensive loss									(45,740)
Common unit-based compensation	—		1,610		—		—		1,610
Distributions from consolidated company to noncontrolling interest	—		—		—		(222)		(222)
Balance at June 30, 2020	127,195,219	$	1,087,782	$	(76,116)	$	11,486	$	1,023,152

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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

6 Months Ended

Jun. 30, 2021

REVENUE FROM CONTRACTS WITH CUSTOMERS

Schedule of disaggregation of revenues by type

	Coal Operations				Royalties
	Illinois								Other and
	Basin		Appalachia		Oil & Gas		Coal		Corporate		Elimination		Consolidated
	(in thousands)
Three Months Ended June 30, 2021
Coal sales	$	210,157	$	115,817	$	—	$	—	$	—	$	—	$	325,974
Oil & gas royalties		—		—		17,114		—		—		—		17,114
Coal royalties		—		—		—		11,653		—		(11,653)		—
Transportation revenues		7,434		4,624		—		—		—		—		12,058
Other revenues		642		282		473		—		8,547		(2,647)		7,297
Total revenues	$	218,233	$	120,723	$	17,587	$	11,653	$	8,547	$	(14,300)	$	362,443
Three Months Ended June 30, 2020
Coal sales	$	134,160	$	102,126	$	—	$	—	$	—	$	—	$	236,286
Oil & gas royalties		—		—		7,786		—		—		—		7,786
Coal royalties		—		—		—		6,778		—		(6,778)		0
Transportation revenues		3,153		2,604		—		—		—		—		5,757
Other revenues		474		2,380		61		—		4,955		(2,497)		5,373
Total revenues	$	137,787	$	107,110	$	7,847	$	6,778	$	4,955	$	(9,275)	$	255,202
Six Months Ended June 30, 2021
Coal sales	$	392,798	$	220,663	$	—	$	—	$	—	$	—	$	613,461
Oil & gas royalties		—		—		31,113		—		—		—		31,113
Coal royalties		—		—		—		22,954		—		(22,954)		—
Transportation revenues		15,114		8,012		—		—		—		—		23,126
Other revenues		1,255		667		494		—		16,315		(5,366)		13,365
Total revenues	$	409,167	$	229,342	$	31,607	$	22,954	$	16,315	$	(28,320)	$	681,065
Six Months Ended June 30, 2020
Coal sales	$	333,258	$	217,665	$	—	$	—	$	—	$	—	$	550,923
Oil & gas royalties		—		—		22,025		—		—		—		22,025
Coal royalties		—		—		—		18,149		—		(18,149)		—
Transportation revenues		7,009		3,487		—		—		—		—		10,496
Other revenues		1,392		14,061		85		5		12,334		(5,356)		22,521
Total revenues	$	341,659	$	235,213	$	22,110	$	18,154	$	12,334	$	(23,505)	$	605,965

Schedule of current coal supply contracts allocated to performance obligations that are unsatisfied or partially unsatisfied

							2024 and
	2021		2022		2023		Thereafter		Total
	(in thousands)
Illinois Basin Coal Operations coal revenues	$	446,385	$	305,362	$	238,070	$	201,875	$	1,191,692
Appalachia Coal Operations coal revenues		218,512		183,520		17,880		10,080		429,992
Total coal revenues (1)	$	664,897	$	488,882	$	255,950	$	211,955	$	1,621,684

(1) Coal revenues generally consists of consolidated revenues excluding our Oil & Gas Royalties segment as well as intercompany revenues from our Coal Royalties segment.

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EARNINGS PER LIMITED PARTNER UNIT (Tables)

6 Months Ended

Jun. 30, 2021

EARNINGS PER LIMITED PARTNER UNIT

Reconciliation of net income and EPU calculations

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands, except per unit data)
Net income (loss) attributable to ARLP	$	44,035	$	(46,664)	$	68,783	$	(191,447)
Less:
Distributions to participating securities		(401)		—		(619)		—
Undistributed earnings attributable to participating securities		(825)		—		(934)		—
Net income (loss) attributable to ARLP available to limited partners	$	42,809	$	(46,664)	$	67,230	$	(191,447)
Weighted-average limited partner units outstanding – basic and diluted		127,195		127,195		127,195		127,134
Earnings per limited partner unit - basic and diluted (1)	$	0.34	$	(0.37)	$	0.53	$	(1.51)

(1) Diluted EPU gives effect to all potentially dilutive common units outstanding during the period using the treasury stock method. Diluted EPU excludes all potentially dilutive units calculated under the treasury stock method if their effect is anti-dilutive.  The combined total of LTIP, SERP and Directors' Deferred Compensation Plan units of 1,525 and 1,397 for the three and six months ended June 30, 2021, respectively, and 661 and 654 for the three and six months ended June 30, 2020, respectively, were considered anti-dilutive under the treasury stock method.

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WORKERS' COMPENSATION AND PNEUMOCONIOSIS (Tables)

6 Months Ended

Jun. 30, 2021

Accrued Workers Compensation And Pneumoconiosis Benefits

Reconciliation of changes in workers' compensation liability

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Beginning balance	$	54,233	$	52,880	$	54,739	$	53,384
Accruals increase		1,565		192		3,237		1,940
Payments		(2,565)		(1,992)		(4,975)		(4,563)
Interest accretion		231		320		463		639
Valuation loss (gain) (1)		(1,405)		3,078		(1,405)		3,078
Ending balance	$	52,059	$	54,478	$	52,059	$	54,478

(1) Our estimate of the liability for the present value of current workers′ compensation benefits is based on our actuarial calculations.  Our actuarial calculations are based on a blend of actuarial projection methods and numerous assumptions including claims development patterns, mortality, medical costs and interest rates.  The valuation gain in 2021 is due to an increase in the discount rate from 1.95% on December 31, 2020 to 2.34% on June 30, 2021. We conducted a mid-year 2020 review of our actuarial assumptions, which resulted in a valuation loss in 2020 due to unfavorable changes in claims development and a decrease in the discount rate from 2.81% on December 31, 2019 to 2.05% on June 30, 2020.

Pneumoconiosis benefits

Accrued Workers Compensation And Pneumoconiosis Benefits

Components of net periodic benefit cost

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Service cost	$	989	$	883	$	2,020	$	1,761
Interest cost (1)		637		749		1,273		1,499
Net amortization (1)		1,043		(171)		2,086		(343)
Net periodic benefit cost	$	2,669	$	1,461	$	5,379	$	2,917

(1) Interest cost and net amortization are included in the Other expense line item within our condensed consolidated statements of income.

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COMMON UNIT-BASED COMPENSATION PLANS (Tables)

6 Months Ended

Jun. 30, 2021

COMMON UNIT-BASED COMPENSATION PLANS

Summary of activity in share-based plans

	Number of units	Weighted average grant date fair value per unit		Intrinsic value
				(in thousands)
Phantom units outstanding as of January 1, 2021	760,630	$	22.04	$	3,408
Granted	12,942		5.99
Phantom units outstanding as of June 30, 2021	773,572		21.77		5,577

Summary of non-vested share activity

	Number of units	Weighted average grant date fair value per unit		Intrinsic value
				(in thousands)
Non-vested grants at January 1, 2021	1,430,489	$	5.02	$	6,409
Granted (1)	1,818,190		6.03
Forfeited	(8,152)		5.02
Non-vested grants at June 30, 2021	3,240,527		5.59		23,364

(1) 921,430 units and 896,760 units have a minimum-value guarantee of $2.53 and $3.79 per unit, respectively, regardless of whether or not the awards vest.

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COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Tables)

6 Months Ended

Jun. 30, 2021

Defined benefit pension plan

Employee Benefit Plans

Components of net periodic benefit cost

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Interest cost	$	860	$	1,054	$	1,720	$	2,108
Expected return on plan assets		(1,671)		(1,491)		(3,342)		(2,983)
Amortization of prior service cost		46		47		93		93
Amortization of net loss		1,142		1,063		2,283		2,127
Net periodic benefit cost (1)	$	377	$	673	$	754	$	1,345

(1) Net periodic benefit cost for the Pension Plan is included in the Other expense line item within our condensed consolidated statements of income.

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SEGMENT INFORMATION (Tables)

6 Months Ended

Jun. 30, 2021

SEGMENT INFORMATION

Schedule of reportable segment results

	Coal Operations				Royalties
	Illinois								Other and		Elimination
	Basin		Appalachia		Oil & Gas		Coal		Corporate		(1)		Consolidated
	(in thousands)
Three Months Ended June 30, 2021
Revenues - Outside	$	218,233	$	120,723	$	17,587	$	—	$	5,900	$	—	$	362,443
Revenues - Intercompany		—		—		—		11,653		2,647		(14,300)		—
Total revenues (2)		218,233		120,723		17,587		11,653		8,547		(14,300)		362,443
Segment Adjusted EBITDA Expense (3)		140,176		74,456		2,419		4,871		4,825		(12,243)		214,504
Segment Adjusted EBITDA (4)		70,623		41,641		15,379		6,782		3,724		(2,057)		136,092
Capital expenditures		12,515		10,382		—		—		1,292		—		24,189
Three Months Ended June 30, 2020
Revenues - Outside	$	137,787	$	107,110	$	7,847	$	—	$	2,458	$	—	$	255,202
Revenues - Intercompany		—		—		—		6,778		2,497		(9,275)		—
Total revenues (2)		137,787		107,110		7,847		6,778		4,955		(9,275)		255,202
Segment Adjusted EBITDA Expense (3)		111,967		74,227		1,119		3,021		4,147		(6,940)		187,541
Segment Adjusted EBITDA (4)		22,667		30,279		6,881		3,757		807		(2,335)		62,056
Capital expenditures		14,029		19,686		—		—		166		—		33,881
Six Months Ended June 30, 2021
Revenues - Outside	$	409,167	$	229,342	$	31,607	$	—	$	10,949	$	—	$	681,065
Revenues - Intercompany		—		—		—		22,954		5,366		(28,320)		—
Total revenues (2)		409,167		229,342		31,607		22,954		16,315		(28,320)		681,065
Segment Adjusted EBITDA Expense (3)		265,757		148,182		4,477		8,899		9,111		(24,205)		412,221
Segment Adjusted EBITDA (4)		128,296		73,147		27,325		14,055		7,205		(4,115)		245,913
Total assets		726,555		425,574		604,355		292,134		489,271		(422,376)		2,115,513
Capital expenditures		28,916		22,048		—		—		4,662		—		55,626
Six Months Ended June 30, 2020
Revenues - Outside	$	341,659	$	235,213	$	22,110	$	5	$	6,978	$	—	$	605,965
Revenues - Intercompany		—		—		—		18,149		5,356		(23,505)		—
Total revenues (2)		341,659		235,213		22,110		18,154		12,334		(23,505)		605,965
Segment Adjusted EBITDA Expense (3)		268,650		154,145		2,002		7,488		8,789		(18,835)		422,239
Segment Adjusted EBITDA (4)		66,000		77,581		20,636		10,666		3,544		(4,670)		173,757
Total assets		814,972		492,073		628,308		294,435		473,119		(417,279)		2,285,628
Capital expenditures		40,258		43,257		—		—		730		—		84,245

(1) The elimination column represents the elimination of intercompany transactions and is primarily comprised of coal royalties paid by certain of our coal operation entities to Alliance Resource Properties, sales from the Matrix Group to our mining operations, coal sales and purchases between operations within different segments, sales of receivables to AROP Funding, financing between segments and insurance premiums paid to Wildcat Insurance.

(2) Revenues included in the Other and Corporate column are primarily attributable to the outside and affiliate revenues at the Matrix Group and coal brokerage activities.  In addition, Other and Corporate includes affiliate revenues from administrative and Wildcat Insurance revenues services.

(3) Segment Adjusted EBITDA Expense includes operating expenses, coal purchases and other income. Transportation expenses are excluded as transportation revenues are recognized in an amount equal to transportation expenses when title passes to the customer.  

Reconciliation of consolidated Segment Adjusted EBITDA Expense to operating expenses (excluding depreciation, depletion and amortization)

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Segment Adjusted EBITDA Expense	$	214,504	$	187,541	$	412,221	$	422,239
Outside coal purchases		(114)		—		(114)		—
Other expense		(1,351)		(377)		(2,548)		(733)
Operating expenses (excluding depreciation, depletion and amortization)	$	213,039	$	187,164	$	409,559	$	421,506

(4) Segment Adjusted EBITDA is defined as net income (loss) attributable to ARLP before net interest expense, income taxes, depreciation, depletion and amortization, general and administrative expenses and asset and goodwill impairments.  Management therefore is able to focus solely on the evaluation of segment operating profitability as it relates to our revenues and operating expenses, which are primarily controlled by our segments.  Consolidated Segment Adjusted EBITDA is reconciled to net income as follows:

Reconciliation of consolidated Segment Adjusted EBITDA to net income

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2021		2020		2021		2020
	(in thousands)
Consolidated Segment Adjusted EBITDA	$	136,092	$	62,056	$	245,913	$	173,757
General and administrative		(17,492)		(13,822)		(32,996)		(27,260)
Depreciation, depletion and amortization		(64,733)		(83,559)		(123,935)		(157,480)
Asset impairments		—		—		—		(24,977)
Goodwill impairment		—		—		—		(132,026)
Interest expense, net		(9,827)		(11,416)		(20,206)		(23,643)
Income tax (expense) benefit		(5)		77		7		182
Net income (loss) attributable to ARLP	$	44,035	$	(46,664)	$	68,783	$	(191,447)
Noncontrolling interest		130		(15)		208		61
Net income (loss)	$	44,165	$	(46,679)	$	68,991	$	(191,386)

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LONG-LIVED ASSET IMPAIRMENTS (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020
Asset impairment charges
Asset impairments		$ 24,977
Illinois Basin
Asset impairment charges
Asset impairments	$ 23,500
Coal Royalties
Asset impairment charges
Asset impairments	$ 1,500

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GOODWILL IMPAIRMENT (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
GOODWILL IMPAIRMENT
Goodwill	$ 4,400		$ 4,373	$ 4,373	$ 136,400
Impairments of goodwill		$ 132,026
Hamilton mining complex
GOODWILL IMPAIRMENT
Goodwill					$ 132,000
Impairments of goodwill	$ 132,000

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INVENTORIES (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
INVENTORIES
Coal	$ 40,091	$ 19,756
Supplies (net of reserve for obsolescence of $5,548 and $5,547, respectively)	34,414	36,651
Total inventories, net	74,505	56,407
Reserve for obsolescence	$ 5,548	$ 5,547

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FAIR VALUE MEASUREMENTS (Details) - Estimated fair value - Significant Observable Inputs (Level 2) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
FAIR VALUE MEASUREMENTS
Long-term debt	$ 479,993	$ 518,317
Total	$ 479,993	$ 518,317

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LONG-TERM DEBT - Components (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Principal
Aggregate maturities of long-term debt	$ 491,774	$ 603,780
Less current maturities	(55,558)	(73,199)
Total long-term debt	436,216	530,581
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(9,573)	(11,160)
Total unamortized debt issuance costs	(9,573)	(11,160)
Revolving credit facility
Principal
Aggregate maturities of long-term debt		87,500
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(6,067)	(7,196)
Senior notes due 2025
Principal
Aggregate maturities of long-term debt	400,000	400,000
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(3,506)	(3,964)
Securitization Facility
Principal
Aggregate maturities of long-term debt	38,100	55,900
May 2019 equipment financing
Principal
Aggregate maturities of long-term debt	3,256	4,956
November 2019 equipment financing
Principal
Aggregate maturities of long-term debt	37,231	42,367
June 2020 equipment financing
Principal
Aggregate maturities of long-term debt	11,357	$ 13,057
Line of credit
Principal
Aggregate maturities of long-term debt	$ 1,830

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LONG-TERM DEBT - Credit Facility (Details) $ in Millions		6 Months Ended
	Mar. 09, 2020 USD ($)	Jun. 30, 2021 USD ($)
Credit Agreement
Long-Term Debt
Maximum borrowing capacity	$ 459.5
ARLP debt arrangements requirements, fixed charge coverage ratio	1.0
ARLP debt arrangements requirements, debt to cash flow ratio	2.5
ARLP debt arrangements requirements, cash flow to interest expense ratio	3.0
Actual debt to cash flow ratio for trailing twelve months		1.08
Actual cash flow to interest expense ratio for trailing twelve months		10.66
ARLP debt arrangements requirements, period over which the ratios are required to be maintained	12 months
Credit Agreement | Eurodollar Rate
Long-Term Debt
Effective interest rate (as a percent)		2.71%
Credit Agreement | Credit Agreement, first lien
Long-Term Debt
ARLP debt arrangements requirements, debt to cash flow ratio	1.5
Actual debt to cash flow ratio for trailing twelve months		0.20
Revolving credit facility
Long-Term Debt
Line of credit facility, available for borrowing		$ 437.7
Annual commitment fee percentage, undrawn portion		0.35%
Letters of credit subfacility
Long-Term Debt
Maximum borrowing capacity	$ 125.0
Letters of credit outstanding		$ 21.8
Swingline subfacility
Long-Term Debt
Maximum borrowing capacity	$ 15.0

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LONG-TERM DEBT - 2025 Senior Notes (Details) - Senior notes due 2025 $ in Millions	Apr. 24, 2017 USD ($)
Issuance of Senior Notes
Principal amount	$ 400.0
Term	8 years
Interest rate (as a percent)	7.50%

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LONG-TERM DEBT - Securitization Facility (Details) - Securitization Facility - USD ($) $ in Millions	Jun. 30, 2021	Jan. 31, 2021	Dec. 05, 2014
Long-Term Debt
Maximum borrowing capacity		$ 60.0	$ 100.0
Facility outstanding amount	$ 38.1

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LONG-TERM DEBT - Equipment financing and other (Details) $ in Millions	Jun. 05, 2020 USD ($)	Nov. 06, 2019 USD ($) payment	May 17, 2019 USD ($)
May 2019 Equipment Financing
Long-Term Debt
Principal amount			$ 10.0
Term			36 months
Effective interest rate (as a percent)			6.25%
November 2019 Equipment Financing
Long-Term Debt
Principal amount		$ 53.1
Term		4 years
Effective interest rate (as a percent)		4.75%
Number of monthly payments | payment		47
Periodic Payment		$ 1.0
Balloon payment on maturity		$ 11.6
June 2020 equipment financing
Long-Term Debt
Principal amount	$ 14.7
Term	48 months
Effective interest rate (as a percent)	6.10%

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LONG-TERM DEBT - Line of Credit (Details) - Line of credit - USD ($) $ in Millions	Feb. 19, 2021	Jun. 30, 2021
Long-Term Debt
Maximum borrowing capacity	$ 5.0
Extension term	6 months
Interest rate (as a percent)	3.50%
Facility outstanding amount		$ 1.8

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VARIABLE INTEREST ENTITIES - Cavalier (Details) - USD ($) $ in Thousands			6 Months Ended		12 Months Ended
	May 14, 2021	Feb. 14, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Variable Interest Entities
Distributions paid to Partners	$ 13,045	$ 51,753	$ 13,045	$ 51,753	$ 51,753
Cavalier Minerals | Alliance Minerals
Variable Interest Entities
Contributions			143,112
Distributions paid to Partners			98,107
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Contributions			5,963
Distributions paid to Partners			$ 4,087
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Incentive distribution of available cash (as a percent)			25.00%
Cavalier Minerals
Variable Interest Entities
Ownership interest in VIE (as a percent)			96.00%
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Noncontrolling ownership interest (as a percent)			4.00%

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VARIABLE INTEREST ENTITIES - All Dale III (Detail) - All Dale Minerals III - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Feb. 28, 2017
Equity Investments
Other Commitment		$ 30.0
Distribution after hurdles (as a percent)	25.00%
Specified internal rate of return (as a percent)	10.00%
Percentage of available cash distributed	125.00%
All Dale Minerals III
Equity Investments
Ownership percentage by limited partners	13.90%

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INVESTMENT - AllDale (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
ASSETS
Beginning balance			$ 27,268
Equity method investment income	$ 341	$ 137	403	$ 588
Ending balance	26,274		26,274
All Dale Minerals III
ASSETS
Beginning balance	26,907	28,114	27,268	28,529
Equity method investment income	341	137	403	588
Distributions received	(974)	(546)	(1,397)	(1,139)
Other				(273)
Ending balance	$ 26,274	$ 27,705	$ 26,274	$ 27,705

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PARTNERS' CAPITAL - Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands				6 Months Ended		12 Months Ended
	Aug. 13, 2021	May 14, 2021	Feb. 14, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
PARTNERS' CAPITAL
Quarterly distribution paid (in dollars per unit)	$ 0.1000	$ 0.1000	$ 0.4000	$ 0.2000		$ 0.4000
Total Cash Distribution		$ 13,045	$ 51,753	$ 13,045	$ 51,753	$ 51,753

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PARTNERS' CAPITAL - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	38 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	May 31, 2018
Partners' capital
Treasury units retired	$ 0.0
Limited Partners' Capital
Partners' capital
Repurchase and retire authorization			$ 100.0
Treasury units retired		$ 93.5
Number of units retired		5,460,639
Repurchase price (in dollars per unit)		$ 17.12
Remaining authorized amount	$ 6.5	$ 6.5

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PARTNERS' CAPITAL - Change (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Increase (Decrease) in Partners's Capital
Balance at beginning of period	$ 1,099,906	$ 1,072,267	$ 1,067,504	$ 1,265,424	$ 1,072,267	$ 1,265,424
Balance at beginning of period (in units)		127,195,219			127,195,219
Comprehensive income (loss):
Net income (loss)	44,165	$ 24,826	(46,679)	(144,707)	$ 68,991	(191,386)
Actuarially determined long-term liability adjustments	2,231	2,231	939	938	4,462	1,877
COMPREHENSIVE INCOME (LOSS)	46,396	27,057	(45,740)	(143,769)	73,453	(189,509)
Settlement of deferred compensation plans				(1,310)
Common unit-based compensation	1,485	723	1,610	(527)
Distributions on deferred common unit-based compensation	(324)			(986)
Distributions from consolidated company to noncontrolling interest	(222)	(141)	(222)	(288)
Distributions to Partners	(12,721)			(50,767)
Other				(273)
Balance at end of period	$ 1,134,520	1,099,906	1,023,152	1,067,504	$ 1,134,520	1,023,152
Balance at end of period (in units)	127,195,219				127,195,219
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partners's Capital
Balance at beginning of period	$ (85,443)	(87,674)	(77,055)	(77,993)	$ (87,674)	(77,993)
Comprehensive income (loss):
Actuarially determined long-term liability adjustments	2,231	2,231	939	938
Balance at end of period	(83,212)	(85,443)	(76,116)	(77,055)	(83,212)	(76,116)
Noncontrolling Interest
Increase (Decrease) in Partners's Capital
Balance at beginning of period	11,313	11,376	11,723	11,935	11,376	11,935
Comprehensive income (loss):
Net income (loss)	130	78	(15)	76
Distributions from consolidated company to noncontrolling interest	(222)	(141)	(222)	(288)
Balance at end of period	11,221	11,313	11,486	11,723	11,221	11,486
Limited Partners' Capital
Increase (Decrease) in Partners's Capital
Balance at beginning of period	$ 1,174,036	$ 1,148,565	$ 1,132,836	$ 1,331,482	$ 1,148,565	$ 1,331,482
Balance at beginning of period (in units)	127,195,219	127,195,219	127,195,219	126,915,597	127,195,219	126,915,597
Comprehensive income (loss):
Net income (loss)	$ 44,035	$ 24,748	$ (46,664)	$ (144,783)
Settlement of deferred compensation plans				$ (1,310)
Settlement of deferred compensation plans (in units)				279,622
Common unit-based compensation	1,485	723	1,610	$ (527)
Distributions on deferred common unit-based compensation	(324)			(986)
Distributions to Partners	(12,721)			(50,767)
Other				(273)
Balance at end of period	$ 1,206,511	$ 1,174,036	$ 1,087,782	$ 1,132,836	$ 1,206,511	$ 1,087,782
Balance at end of period (in units)	127,195,219	127,195,219	127,195,219	127,195,219	127,195,219	127,195,219

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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of revenues
Revenues	$ 362,443	$ 255,202	$ 681,065	$ 605,965
Illinois Basin
Disaggregation of revenues
Revenues	218,233	137,787	409,167	341,659
Appalachia
Disaggregation of revenues
Revenues	120,723	107,110	229,342	235,213
Oil & Gas Royalties
Disaggregation of revenues
Revenues	17,587	7,847	31,607	22,110
Coal Royalties
Disaggregation of revenues
Revenues	11,653	6,778	22,954	18,154
Other and Corporate
Disaggregation of revenues
Revenues	8,547	4,955	16,315	12,334
Operating segments
Disaggregation of revenues
Revenues	362,443	255,202	681,065	605,965
Operating segments | Illinois Basin
Disaggregation of revenues
Revenues	218,233	137,787	409,167	341,659
Operating segments | Appalachia
Disaggregation of revenues
Revenues	120,723	107,110	229,342	235,213
Operating segments | Oil & Gas Royalties
Disaggregation of revenues
Revenues	17,587	7,847	31,607	22,110
Operating segments | Coal Royalties
Disaggregation of revenues
Revenues				5
Operating segments | Other and Corporate
Disaggregation of revenues
Revenues	5,900	2,458	10,949	6,978
Elimination
Disaggregation of revenues
Revenues	(14,300)	(9,275)	(28,320)	(23,505)
Elimination | Coal Royalties
Disaggregation of revenues
Revenues	11,653	6,778	22,954	18,149
Elimination | Other and Corporate
Disaggregation of revenues
Revenues	2,647	2,497	5,366	5,356
Coal sales
Disaggregation of revenues
Revenues	325,974	236,286	613,461	550,923
Coal sales | Illinois Basin
Disaggregation of revenues
Revenues	210,157	134,160	392,798	333,258
Coal sales | Appalachia
Disaggregation of revenues
Revenues	115,817	102,126	220,663	217,665
Coal royalties
Disaggregation of revenues
Revenues		0
Coal royalties | Coal Royalties
Disaggregation of revenues
Revenues	11,653	6,778	22,954	18,149
Coal royalties | Elimination
Disaggregation of revenues
Revenues	(11,653)	(6,778)	(22,954)	(18,149)
Oil & gas royalties
Disaggregation of revenues
Revenues	17,114	7,786	31,113	22,025
Oil & gas royalties | Oil & Gas Royalties
Disaggregation of revenues
Revenues	17,114	7,786	31,113	22,025
Transportation revenues
Disaggregation of revenues
Revenues	12,058	5,757	23,126	10,496
Transportation revenues | Illinois Basin
Disaggregation of revenues
Revenues	7,434	3,153	15,114	7,009
Transportation revenues | Appalachia
Disaggregation of revenues
Revenues	4,624	2,604	8,012	3,487
Other revenues
Disaggregation of revenues
Revenues	7,297	5,373	13,365	22,521
Other revenues | Illinois Basin
Disaggregation of revenues
Revenues	642	474	1,255	1,392
Other revenues | Appalachia
Disaggregation of revenues
Revenues	282	2,380	667	14,061
Other revenues | Oil & Gas Royalties
Disaggregation of revenues
Revenues	473	61	494	85
Other revenues | Coal Royalties
Disaggregation of revenues
Revenues				5
Other revenues | Other and Corporate
Disaggregation of revenues
Revenues	8,547	4,955	16,315	12,334
Other revenues | Elimination
Disaggregation of revenues
Revenues	$ (2,647)	$ (2,497)	$ (5,366)	$ (5,356)

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REVENUE FROM CONTRACTS WITH CUSTOMERS - Supply contracts (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Performance obligations unsatisfied or partially unsatisfied
Total	$ 1,621,684
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 664,897
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 488,882
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 255,950
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 211,955
Expected timing of satisfaction period	1 year
Illinois Basin
Performance obligations unsatisfied or partially unsatisfied
Total	$ 1,191,692
Illinois Basin | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 446,385
Expected timing of satisfaction period	1 year
Illinois Basin | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 305,362
Expected timing of satisfaction period	1 year
Illinois Basin | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 238,070
Expected timing of satisfaction period	1 year
Illinois Basin | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 201,875
Expected timing of satisfaction period	1 year
Appalachia
Performance obligations unsatisfied or partially unsatisfied
Total	$ 429,992
Appalachia | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 218,512
Expected timing of satisfaction period	1 year
Appalachia | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 183,520
Expected timing of satisfaction period	1 year
Appalachia | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 17,880
Expected timing of satisfaction period	1 year
Appalachia | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 10,080
Expected timing of satisfaction period	1 year

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EARNINGS PER LIMITED PARTNER UNIT - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
EARNINGS PER LIMITED PARTNER UNIT
Net income (loss) attributable to ARLP	$ 44,035	$ (46,664)	$ 68,783	$ (191,447)
Distributions to participating securities	(401)		(619)
Undistributed earnings attributable to participating securities	(825)		(934)
Net income (loss) attributable to ARLP available to limited partners	$ 42,809	$ (46,664)	$ 67,230	$ (191,447)
Weighted-average limited partner units outstanding - basic and diluted	127,195,219	127,195,219	127,195,219	127,133,764
Earnings per limited partner unit - basic and diluted	$ 0.34	$ (0.37)	$ 0.53	$ (1.51)
Anti-dilutive under the treasury stock method (in units)	1,525,000	661,000	1,397,000	654,000

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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Liability (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of changes in the workers' compensation liability
Beginning balance	$ 54,233	$ 52,880	$ 54,739	$ 53,384	$ 53,384
Accruals increase	1,565	192	3,237	1,940
Payments	(2,565)	(1,992)	(4,975)	(4,563)
Interest accretion	231	320	463	639
Valuation loss (gain)	(1,405)	3,078	(1,405)	3,078
Ending balance	52,059	$ 54,478	$ 52,059	$ 54,478	$ 54,739	$ 53,384
Workers' compensation discount rate			2.34%	2.05%	1.95%	2.81%
Receivables for traumatic injury claims	$ 7,100		$ 7,100

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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accrued Workers Compensation And Pneumoconiosis Benefits
Interest cost	$ 860	$ 1,054	$ 1,720	$ 2,108
Net amortization	1,142	1,063	2,283	2,127
Net periodic benefit cost	377	673	754	1,345
Pneumoconiosis benefits
Accrued Workers Compensation And Pneumoconiosis Benefits
Service cost	989	883	2,020	1,761
Interest cost	637	749	1,273	1,499
Net amortization	1,043	(171)	2,086	(343)
Net periodic benefit cost	$ 2,669	$ 1,461	$ 5,379	$ 2,917

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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Grants (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Number of units
Balance at the beginning of the period (in units)	1,430,489
Granted (in units)	1,818,190
Forfeited (in units)	(8,152)
Balance at the end of the period (in units)	3,240,527
Weighted average grant date fair value per unit
Balance at the beginning of the period (in dollars per unit)	$ 5.02
Granted (in dollars per unit)	6.03
Forfeited (in dollars per unit)	5.02
Balance at the end of the period (in dollars per unit)	$ 5.59
Intrinsic value (in dollars)
Intrinsic value of outstanding grants (in dollars)	$ 23,364	$ 6,409
$2.53 minimum-value guarantee
Other information
Guaranteed minimum (in shares)	921,430
Guaranteed minimum (in dollars per unit)	$ 2.53
$3.79 minimum-value guarantee
Other information
Guaranteed minimum (in shares)	896,760
Guaranteed minimum (in dollars per unit)	$ 3.79

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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Other (Details) - ARLP LTIP - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other information
Unit-based compensation expense	$ 1.4	$ 1.6	$ 2.1	$ 0.9
Reversal of cumulative previously recognized expenses			4.8
Total unit-based obligation recorded	3.5		3.5
Unrecognized compensation expense (in dollars)	$ 14.6		$ 14.6
Weighted-average period for recognition of expense			2 years 1 month 6 days

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COMMON UNIT-BASED COMPENSATION PLANS - SERP and Directors Comp (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Weighted average grant date fair value per unit
Granted (in dollars per unit)			$ 6.03
Intrinsic value of outstanding grants (in dollars)	$ 23,364		$ 23,364		$ 6,409
SERP and Deferred Compensation Plans
Number of units
Balance at the beginning of the period (in units)			760,630
Granted (in units)			12,942
Balance at the end of the period (in units)	773,572		773,572
Other information
Unit-based compensation expense	$ 100	$ 100	$ 200	$ 400
Total unit-based obligation recorded	$ 16,800		$ 16,800
SERP and Deferred Compensation Plans | Phantom Share Units (PSUs)
Weighted average grant date fair value per unit
Balance at the beginning of the period (in dollars per unit)			$ 22.04
Granted (in dollars per unit)			5.99
Balance at the end of the period (in dollars per unit)	$ 21.77		$ 21.77
Intrinsic value of outstanding grants (in dollars)	$ 5,577		$ 5,577		$ 3,408

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COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Components of net periodic benefit cost:
Interest cost	$ 860	$ 1,054	$ 1,720	$ 2,108
Expected return on plan assets	(1,671)	(1,491)	(3,342)	(2,983)
Amortization of prior service cost	46	47	93	93
Amortization of net loss	1,142	1,063	2,283	2,127
Net periodic benefit cost	$ 377	$ 673	754	$ 1,345
2020 plan year
Components of net periodic benefit cost:
Employer contribution			$ 3,300

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SEGMENT INFORMATION - Segment Results (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Information
Number of reportable segments | segment			4
Reportable segment results
Revenues	$ 362,443	$ 255,202	$ 681,065	$ 605,965
Segment Adjusted EBITDA Expense	214,504	187,541	412,221	422,239
Segment Adjusted EBITDA	136,092	62,056	245,913	173,757
Total assets	2,115,513	2,285,628	2,115,513	2,285,628	$ 2,166,016
Capital expenditures	24,189	33,881	$ 55,626	84,245
Coal Operations
Segment Information
Number of reportable segments | segment			2
Number of mining complex | segment			7
Illinois Basin
Reportable segment results
Revenues	218,233	137,787	$ 409,167	341,659
Segment Adjusted EBITDA Expense	140,176	111,967	265,757	268,650
Segment Adjusted EBITDA	70,623	22,667	128,296	66,000
Total assets	726,555	814,972	726,555	814,972
Capital expenditures	12,515	14,029	28,916	40,258
Appalachia
Reportable segment results
Revenues	120,723	107,110	229,342	235,213
Segment Adjusted EBITDA Expense	74,456	74,227	148,182	154,145
Segment Adjusted EBITDA	41,641	30,279	73,147	77,581
Total assets	425,574	492,073	425,574	492,073
Capital expenditures	10,382	19,686	22,048	43,257
Oil & Gas Royalties
Reportable segment results
Revenues	17,587	7,847	31,607	22,110
Segment Adjusted EBITDA Expense	2,419	1,119	4,477	2,002
Segment Adjusted EBITDA	15,379	6,881	27,325	20,636
Total assets	604,355	628,308	604,355	628,308
Coal Royalties
Reportable segment results
Revenues	11,653	6,778	22,954	18,154
Segment Adjusted EBITDA Expense	4,871	3,021	8,899	7,488
Segment Adjusted EBITDA	6,782	3,757	14,055	10,666
Total assets	292,134	294,435	292,134	294,435
Other and Corporate
Reportable segment results
Revenues	8,547	4,955	16,315	12,334
Segment Adjusted EBITDA Expense	4,825	4,147	9,111	8,789
Segment Adjusted EBITDA	3,724	807	7,205	3,544
Total assets	489,271	473,119	489,271	473,119
Capital expenditures	1,292	166	4,662	730
Operating segments
Reportable segment results
Revenues	362,443	255,202	681,065	605,965
Operating segments | Illinois Basin
Reportable segment results
Revenues	218,233	137,787	409,167	341,659
Operating segments | Appalachia
Reportable segment results
Revenues	120,723	107,110	229,342	235,213
Operating segments | Oil & Gas Royalties
Reportable segment results
Revenues	17,587	7,847	31,607	22,110
Operating segments | Coal Royalties
Reportable segment results
Revenues				5
Operating segments | Other and Corporate
Reportable segment results
Revenues	5,900	2,458	10,949	6,978
Elimination
Reportable segment results
Revenues	(14,300)	(9,275)	(28,320)	(23,505)
Segment Adjusted EBITDA Expense	(12,243)	(6,940)	(24,205)	(18,835)
Segment Adjusted EBITDA	(2,057)	(2,335)	(4,115)	(4,670)
Total assets	(422,376)	(417,279)	(422,376)	(417,279)
Elimination | Coal Royalties
Reportable segment results
Revenues	11,653	6,778	22,954	18,149
Elimination | Other and Corporate
Reportable segment results
Revenues	$ 2,647	$ 2,497	$ 5,366	$ 5,356

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SEGMENT INFORMATION - EBITDA Expense Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reconciliation of consolidated Segment Adjusted EBITDA Expense
Segment Adjusted EBITDA Expense	$ 214,504	$ 187,541	$ 412,221	$ 422,239
Outside coal purchases	(114)		(114)
Other expense	(1,351)	(377)	(2,548)	(733)
Product [Member]
Reconciliation of consolidated Segment Adjusted EBITDA Expense
Operating expenses (excluding depreciation, depletion and amortization)	$ 213,039	$ 187,164	$ 409,559	$ 421,506

XML

SEGMENT INFORMATION - EBITDA Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Reconciliation of consolidated Segment Adjusted EBITDA to net income
Consolidated Segment Adjusted EBITDA	$ 136,092		$ 62,056		$ 245,913	$ 173,757
General and administrative	(17,492)		(13,822)		(32,996)	(27,260)
Depreciation, depletion and amortization	(64,733)		(83,559)		(123,935)	(157,480)
Asset impairment						(24,977)
Goodwill impairment						(132,026)
Interest expense, net	(9,827)		(11,416)		(20,206)	(23,643)
Income tax (expense) benefit	(5)		77		7	182
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP	44,035		(46,664)		68,783	(191,447)
Noncontrolling interest	130		(15)		208	61
NET INCOME (LOSS)	$ 44,165	$ 24,826	$ (46,679)	$ (144,707)	$ 68,991	$ (191,386)