Significant Accounting Policies (Policies)	12 Months Ended
Dec. 31, 2022
Summary of Significant Accounting Policies.
Basis of Presentation	Basis of Presentation and Consolidation—The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and U.S. Securities and Exchange Commission regulations. The financial statements are presented on a consolidated basis for all periods presented. All significant intercompany balances and transactions between consolidated entities have been eliminated in consolidation.
Use of estimates	Use of estimates—The preparation of these financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect certain reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. The most significant estimates are related to the quantity and value of coal inventories, stock-based compensation, asset retirement obligations, occupational disease obligations, evaluation of long-lived assets for impairment, and the quantities and values of coal reserves, depletion and amortization, useful lives, and income taxes.
Revenue Recognition	Revenue Recognition—Our primary source of revenue is from the sale of coal through contracts with steel producers usually having durations of less than one year. Revenue is recognized when performance obligations under the terms of a contract with our customers are satisfied. This occurs when control of the coal is transferred to our customers. For coal shipments to domestic customers via rail, control is generally transferred when the railcar is loaded. Control is transferred for export coal shipments to customers via ocean vessel when the vessel is loaded at the port. Our coal sales generally include up to 90-day payment terms following the transfer of control of the goods to our customer. In the case of some of our foreign customers, our contracts also require that letters of credit are posted to secure payment of any outstanding receivable. We do not include extended payment terms in our contracts. Our contracts with customers typically provide for minimum specifications or qualities of the coal we deliver. Variances from these specifications or qualities are settled by means of price adjustments. Generally, these price adjustments are settled within 30 days of delivery and are insignificant. Certain of our contracts with customers include provisions in which the price is derived from an index. If control of the goods transfers to the customer in the period before the final price is determined, revenue is recorded based on the estimated consideration to be received. The Company estimates the amount to which it expects to receive by reference to forward curve or other relevant data. These estimates have not been constrained for accounting purposes due to the short period of time over which the uncertainty is resolved. Freight Revenue and Expense—Costs incurred to transport coal to the point of sale at the port facility are included in cost of sales and the gross amounts billed to customers to cover shipping to and handling of the coal at the port are included in revenue.
Cash and cash equivalents	Cash and Cash Equivalents—We classify all highly-liquid instruments with an original maturity of three months or less as cash equivalents. Restricted cash balances at December 31, 2022 and December 31, 2021 were $0.9 million and consisted of funds held in escrow for potential future workers’ compensation claims. Restricted cash balances were included in other current assets on the consolidated balance sheets.
Inventories	Inventories— Coal is reported as inventory at the point in time it is extracted from the mine. Coal inventories are valued at the lower of average cost or net realizable value, with cost determined on a first-in, first-out inventory valuation method. Coal inventory costs include labor, supplies, equipment costs, freight, operating overhead, depreciation and amortization. Coal inventory quantities are adjusted periodically based on aerial surveys of coal stockpiles. Supply inventories are valued at average cost. Coal inventories at December 31, 2022, were made up of $22.4 million of raw coal, $18.2 million of saleable coal, and $4.4 million of supplies. Coal inventories at December 31, 2021, were made up of $12.5 million of saleable coal, $2.6 million of supplies, and $0.7 million of raw coal.
Property, Plant and Equipment	Property, Plant and Equipment—Property, plant and equipment is recorded at cost. Expenditures which extend the useful lives of existing plant and equipment are capitalized. Planned major maintenance costs which do not extend the useful lives of existing plant and equipment are expensed as incurred. When assets are retired or otherwise disposed, the related cost and accumulated depreciation are removed from the respective accounts and any profit or loss on disposition is recognized in the consolidated statements of operations. Coal exploration costs are expensed as incurred. Coal exploration costs include those incurred to ascertain existence, location, extent or quality of ore or minerals before beginning the development stage of the mine. Mining property and mineral rights costs represent the costs incurred to acquire the rights to access and mine certain coal property either through deeds, leases, or other conveyance agreements. These costs include costs of acquiring, and accessing mineral reserves, resources and surface areas for mining activities. Mine development begins when the facts and circumstances clearly establish the presence of a commercial mineralized deposit. Capitalized mine development costs represent the costs incurred to prepare mine sites and/or seams of coal for future mining. These costs include costs of acquiring, permitting, planning, research, and developing access to identified mineral reserves and other preparations for commercial production as necessary to develop and permit the properties for mining activities. When components of capitalized mine development costs are replaced with new components, the Company capitalizes the replacement as a separate component and charges off the net book value of the component that was replaced at the cease-use date. If it is determined that an undeveloped mineral interest cannot be economically converted into proven and probable reserves, capitalized costs are assessed for impairment and future development costs are expensed as incurred. Operating expenditures including certain professional fees and overhead costs are not capitalized but are expensed as incurred. Mineral rights and capitalized mine development costs are depleted and amortized on a units-of-production basis as mining of that mine’s assigned reserves takes place. Depreciation of plant and equipment is calculated on the straight-line method over their estimated useful lives ranging from three to thirty years.
Advanced Coal Royalties	Advanced Coal Royalties—In most cases, we acquire the right to mine coal reserves under leases which call for the payment of royalties on coal as it is mined and sold. In many cases, these mineral leases require the payment of advance or minimum coal royalties to lessors that are recoupable against future production royalties. These advance payments are deferred and charged to operations as the coal reserves are mined.
Impairment of Long-lived Assets	Impairment of Long-lived Assets—We review and evaluate held-and-used long-lived assets, including property, plant and equipment and mine development costs, for impairment when events or changes in circumstances indicate that the asset or asset group’s carrying value may not be recoverable. Recoverability is measured by comparing the carrying amount of the asset or asset group to the estimated undiscounted future cash flows expected to be generated by the asset or asset group. If the carrying amount of the asset or asset group exceeds its estimated undiscounted future cash flows, an impairment loss is recorded for the excess of the carrying amount over the estimated fair value, if any. We may, under limited circumstances, idle mining operations in response to certain events or conditions. Because an idling is not a permanent closure, it is not considered an automatic indicator of impairment.
Asset Retirement Obligations	Asset Retirement Obligations—Legal obligations associated with the retirement of long-lived assets are initially recognized at their estimated fair value, with a corresponding charge to capitalized development costs, at the time they are incurred. Our asset retirement obligations primarily consist of spending estimates related to reclaiming metallurgical coal land and support facilities in accordance with federal and state reclamation laws as defined by each mining permit. Spending estimates are adjusted for inflation and then discounted at the credit-adjusted, risk-free rate. We record the fair value of a liability for an asset retirement obligation in the period in which it is incurred and a corresponding increase in the carrying amount of the related long-lived asset. The liability is accreted to its present value each period and the capitalized cost is amortized using the units-of-production method over estimated recoverable reserves upon commencement of mining. We review our asset retirement obligations on at least an annual basis for significant changes in the estimated timing or amount of cash flows. Occupational Disease (Pneumoconiosis) Obligations. We recognize as a liability to provide for occupational disease (pneumoconiosis) benefits to eligible employees, former employees and dependents as required by the Federal Mine Safety and Health Act of 1969, as amended. The occupational disease benefit obligation represents the present value of the actuarially computed liabilities for such benefits over the employees’ applicable years of service. Estimating our occupational disease (pneumoconiosis) benefits obligation requires management to make estimates and judgments regarding timing and existence of a liability utilizing third-party actuaries to assist in preparing what constitutes adequate liability amounts. Inherent in the calculation are numerous assumptions and judgments including the ultimate costs, inflation factors, credit adjusted discount rates, timing of settlement awards in the legal and regulatory environments. Adjustments to estimated liabilities due to changes in actuarial assumptions are recorded immediately in earnings in the period in which the change in estimate occurs. Other Income—We accounted for the SBA Paycheck Protection Program Loan (“PPP Loan”) as an in-substance government grant because we expected to meet the PPP Loan forgiveness eligibility criteria and concluded that the loan represents, in substance, a grant that is expected to be forgiven. Proceeds from the PPP Loan were initially recognized as a deferred income liability. Subsequently, we reduced this liability and recognized income on a systematic basis over the period in which the related costs for which the PPP Loan was intended were incurred. PPP Loan income is presented as other income within the consolidated statements of operations for 2020. In addition, we recognized $5.4 million associated with the Coronavirus Aid, Relief and Economic Security Act Employee Retention Tax Credit as other income within the consolidated statements of operations for 2021.
Other income	Other Income—We accounted for the SBA Paycheck Protection Program Loan (“PPP Loan”) as an in-substance government grant because we expected to meet the PPP Loan forgiveness eligibility criteria and concluded that the loan represents, in substance, a grant that is expected to be forgiven. Proceeds from the PPP Loan were initially recognized as a deferred income liability. Subsequently, we reduced this liability and recognized income on a systematic basis over the period in which the related costs for which the PPP Loan was intended were incurred. PPP Loan income is presented as other income within the consolidated statements of operations for 2020.
Leases	Leases—We determine if an arrangement is or contains a lease at contract inception, and lease classification is determined at the commencement date. Leases are recognized on the balance sheet as right-of-use (“ROU”) assets and lease liabilities except for leases with a term of 12 months or less. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating and finance lease ROU assets and liabilities are recognized at commencement date based on the present value of the fixed lease payments over the lease term. The Company does not separate lease and non-lease components for all leases as permitted under the accounting guidance for leases. As most of our leases do not contain a readily determinable implicit rate, we generally use our incremental borrowing rate based on the estimated rate of interest for collateralized borrowing over a similar term of the lease payments at commencement date. The operating and finance lease ROU assets also include lease prepayments made by the Company and are reduced by any lease incentives received by the Company prior to commencement. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. For operating leases, lease expense is recorded in the income statement based on a straight-line recognition of the total fixed payments over the lease term. For finance leases, accretion of the liability is recognized as interest expense and the ROU asset is amortized separately on a straight-line basis similar to the depreciation of equipment owned by the Company. Leases of mineral reserves and the related land leases are exempted under U.S. GAAP from recognition on the consolidated balance sheets.
Fair Value Measurements	Fair Value Measurements— Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Assets and liabilities that are recognized or disclosed at fair value are categorized in the fair value hierarchy based on the observability of the inputs utilized in the valuation. The levels of the hierarchy include: Level 1 - inputs are quoted prices in active markets for the identical assets or liabilities; Level 2 - inputs are other than quoted prices included in Level 1 that are directly or indirectly observable through market-corroborated inputs; and Level 3 - inputs are unobservable, or observable but cannot be market-corroborated, requiring us to make assumptions about pricing by market participants. The fair values of cash and cash equivalents, accounts receivable, restricted cash, and accounts payable approximate their carrying amounts at each reporting date. The Company’s Senior Notes have an estimated fair value of $36 million and $38 million at December 31, 2022 and 2021, respectively. The fair values of the Company’s Senior Notes were based on observable market prices and were considered a Level 2 measurement at December 31, 2022 and a Level 1 measurement at December 31, 2021 based on trading volumes. The difference between the fair value and carrying amount of the Company’s remaining debts is not material due to the similarity between the terms of the debt agreements and prevailing market terms available to the Company. Nonrecurring fair value measurements of the Company include asset retirement obligations and estimated values used to allocate the acquisition cost of long-lived assets to individual assets, neither of which are subject to the fair value disclosure requirements. The fair value of asset retirement obligations is determined as the present value of estimated cash flows related to reclamation obligations, which is likely a Level 3 measurement due the use of unobservable inputs such as estimates regarding the amount and timing of costs to be incurred, the Company’s credit-adjusted discount rate, and inflation rates. The consideration for the Company’s acquisitions was allocated based on the relative fair values of the assets acquired, the primary asset of which was mineral rights. The fair values of mineral rights were determined based on Level 3 inputs, which are generally unobservable, requiring the Company to make assumptions about future coal prices, capital expenditures, future coal production, costs of production, and an appropriate rate at which to discount the future cash flows.
Income Taxes	Income Taxes—Income tax expense (benefit) includes Federal and state income taxes. Certain income and expenses are not reported in tax returns and financial statements in the same year. The tax effect of such temporary differences is reported as deferred income taxes. We account for deferred income taxes by applying statutory tax rates in effect at the reporting date of the balance sheet. A valuation allowance is established if it is more likely than not that the related tax benefits will not be realized. In determining the appropriate valuation allowance, we consider the projected realization of tax benefits based on expected levels of future taxable income, available tax planning strategies and reversals of existing taxable temporary differences. Uncertain tax positions are recognized only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. We had no uncertain tax positions requiring liability recognition as of December 31, 2022 and 2021. We file income tax returns in the U.S. and in various state and local jurisdictions which may be routinely examined by tax authorities. The statute of limitations is currently open for all tax returns filed.
Segment Reporting	Segment Reporting—Our properties located in West Virginia, Virginia and Pennsylvania each consist of mineral reserves for production of metallurgical coal from both underground and surface mines. These operations are within the Appalachian basin. Geology, coal transportation routes to customers, regulatory environments and coal quality or type are characteristic to a basin. For financial reporting purposes, these operations represent a single segment because each possesses similar production methods, distribution methods, and customer quality and consumption characteristics, resulting in similar long-term expected financial performance. The Ramaco Coal acquisition in 2022, as discussed in greater detail in Note 4, provides the Company with royalty savings and controlled mineral rights as well as a research and pilot facility located near Sheridan, Wyoming related to the Company’s possible expansion into the manufacturing and commercialization of advanced carbon products and materials from coal. The Wyoming property includes a thermal coal deposit and permit and is currently undergoing mineral analysis and core drilling to assess potential concentrations of rare earth elements. The Company refers to this potentially new business line as “CORE” (Carbon Ore-Rare Earth), signifying its focus on carbon ore and rare earth elements. CORE represents a separate operating segment and has economic and geographic differences compared to the Company’s metallurgical operations in the Appalachian basin; however, CORE does not meet the significance tests for separate disclosure as a reportable segment at this time. In addition, reconciling items of the metallurgical coal segment to the Company’s consolidated results are not yet material. The chief operating decision maker does not regularly review segment asset information for the purpose of assessing performance and making resource allocation decisions.
Stock-Based Compensation	Stock-Based Compensation—Compensation cost for equity awards is based on the grant-date fair value of the award and is recognized over the requisite service period. Forfeitures are recognized as they occur. The fair values of restricted stock and restricted stock unit awards having only a service condition were determined using the publicly-traded price of our common stock on the grant date. The fair value of performance stock units, which vest based on the achievement of relative total shareholder return goals, was determined on the date of grant based on a Monte Carlo simulation. The fair value of stock option awards was calculated using the Black-Scholes option-pricing model. The Black-Scholes model requires us to make assumptions and judgments about the variables used in the calculation, including the expected term, expected volatility, risk-free interest rate, dividend rate and service period.
Concentrations	Concentrations—Our operations are all related to metallurgical coal within the mining industry. A reduction in metallurgical coal prices or other disturbances in the metallurgical coal markets could have an adverse effect on our operations. In 2022, 2021, and 2020, approximately 58%, 51%, and 71%, respectively, of our revenue was derived from coal shipments to customers in North American markets. Financial instruments that potentially subject us to a significant concentration of credit risk consist primarily of cash and cash equivalents, restricted cash and accounts receivable. We maintain deposits in federally insured financial institutions in excess of federally insured limits. We monitor the credit ratings and concentration of risk with these financial institutions on a continuing basis to safeguard cash deposits. We have a limited number of customers. Contracts with these customers provide for billings principally upon shipment and compliance with payment terms is monitored on an ongoing basis. Outstanding receivables beyond payment terms are promptly investigated and discussed with the specific customer. We estimate an allowance for doubtful accounts by taking into consideration the age of past due accounts and an assessment of our customers’ ability to pay. An allowance for doubtful accounts was not necessary as of December 31, 2022 and 2021. During 2022, sales to two customers accounted for approximately 38% of total revenue. The total balance due from these customers at December 31, 2022 was approximately 32% of total accounts receivable. During 2021, sales to three customers accounted for approximately 58% of total revenue. The total balance due from these customers at December 31, 2021 was approximately 58% of total accounts receivable. During 2020, sales to three customers accounted for approximately 70% of total revenue. The number of customers comprising the concentrations above is based on a threshold of 10% or more of total revenues and related receivables.
Recent Accounting Pronouncements Adopted	Recent Accounting Pronouncements Adopted In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses, which replaces the existing incurred loss impairment model with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. We adopted this standard effective January 1, 2020. The adoption of this ASU did not have a material impact on our consolidated financial statements because we do not have a history of credit losses on our financial instruments and have no material expected losses. In August 2018, the FASB issued ASU 2018-15, Internal-Use Software, which addresses the accounting for implementation costs associated with a hosted service. The standard provides that implementation costs be evaluated for capitalization using the same criteria as that used for internal-use software development costs, with amortization expense being recorded in the same income statement expense line as the hosted service costs and over the expected term of the hosting arrangement. We adopted this standard as of January 1, 2020, on a prospective basis. The adoption of this ASU did not have a material impact on our consolidated financial statements. In December 2019, the FASB issued ASU 2019-12, Income Taxes, which enhances and simplifies various aspects of the income tax accounting guidance, including requirements such as tax basis step-up in goodwill obtained in a transaction that is not a business combination, ownership changes in investments, and interim-period accounting for enacted changes in tax law. The standard was effective for us in the first quarter of 2021. The adoption of this ASU did not have a material impact on our consolidated financial statements. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, which became effective immediately. The amendments in ASU 2020-04 provide optional relief regarding the accounting effects of reference rate reform, including various types of contract modifications (e.g., debt) as well as hedging relationships. Overall, the guidance permits financial reporting that generally reflects the intended continuation of contracts that reference rates, such as the London Interbank Offered Rate (“LIBOR”), that are expected to be discontinued as a result of reference rate reform initiatives. In December 2022, the FASB issued ASU 2022-06, which defers the sunset date of ASC 848 from December 31, 2022 to December 31, 2024. The Company had previously entered into a term loan that referenced LIBOR; however, this debt was repaid in the fourth quarter of 2022 and, therefore, a contract amendment to replace LIBOR is not required. The Company is unaware of any additional references to rates that will be discontinued under reform initiatives.

Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2022

Summary of Significant Accounting Policies.

Basis of Presentation and Consolidation—The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and U.S. Securities and Exchange Commission regulations. The financial statements are presented on a consolidated basis for all periods presented. All significant intercompany balances and transactions between consolidated entities have been eliminated in consolidation.

Use of estimates

Use of estimates—The preparation of these financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect certain reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. The most significant estimates are related to the quantity and value of coal inventories, stock-based compensation, asset retirement obligations, occupational disease obligations, evaluation of long-lived assets for impairment, and the quantities and values of coal reserves, depletion and amortization, useful lives, and income taxes.

Revenue Recognition

Revenue Recognition—Our primary source of revenue is from the sale of coal through contracts with steel producers usually having durations of less than one year. Revenue is recognized when performance obligations under the terms of a contract with our customers are satisfied. This occurs when control of the coal is transferred to our customers. For coal shipments to domestic customers via rail, control is generally transferred when the railcar is loaded. Control is transferred for export coal shipments to customers via ocean vessel when the vessel is loaded at the port.

Our coal sales generally include up to 90-day payment terms following the transfer of control of the goods to our customer. In the case of some of our foreign customers, our contracts also require that letters of credit are posted to secure payment of any outstanding receivable. We do not include extended payment terms in our contracts. Our contracts with customers typically provide for minimum specifications or qualities of the coal we deliver. Variances from these specifications or qualities are settled by means of price adjustments. Generally, these price adjustments are settled within 30 days of delivery and are insignificant.

Certain of our contracts with customers include provisions in which the price is derived from an index. If control of the goods transfers to the customer in the period before the final price is determined, revenue is recorded based on the estimated consideration to be received. The Company estimates the amount to which it expects to receive by reference to forward curve or other relevant data. These estimates have not been constrained for accounting purposes due to the short period of time over which the uncertainty is resolved.

Freight Revenue and Expense—Costs incurred to transport coal to the point of sale at the port facility are included in cost of sales and the gross amounts billed to customers to cover shipping to and handling of the coal at the port are included in revenue.

Cash and cash equivalents

Cash and Cash Equivalents—We classify all highly-liquid instruments with an original maturity of three months or less as cash equivalents. Restricted cash balances at December 31, 2022 and December 31, 2021 were $0.9 million and consisted of funds held in escrow for potential future workers’ compensation claims. Restricted cash balances were included in other current assets on the consolidated balance sheets.

Inventories

Inventories— Coal is reported as inventory at the point in time it is extracted from the mine. Coal inventories are valued at the lower of average cost or net realizable value, with cost determined on a first-in, first-out inventory valuation method. Coal inventory costs include labor, supplies, equipment costs, freight, operating overhead,

depreciation and amortization. Coal inventory quantities are adjusted periodically based on aerial surveys of coal stockpiles. Supply inventories are valued at average cost. Coal inventories at December 31, 2022, were made up of $22.4 million of raw coal, $18.2 million of saleable coal, and $4.4 million of supplies. Coal inventories at December 31, 2021, were made up of $12.5 million of saleable coal, $2.6 million of supplies, and $0.7 million of raw coal.

Property, Plant and Equipment

Property, Plant and Equipment—Property, plant and equipment is recorded at cost. Expenditures which extend the useful lives of existing plant and equipment are capitalized. Planned major maintenance costs which do not extend the useful lives of existing plant and equipment are expensed as incurred. When assets are retired or otherwise disposed, the related cost and accumulated depreciation are removed from the respective accounts and any profit or loss on disposition is recognized in the consolidated statements of operations.

Coal exploration costs are expensed as incurred. Coal exploration costs include those incurred to ascertain existence, location, extent or quality of ore or minerals before beginning the development stage of the mine.

Mining property and mineral rights costs represent the costs incurred to acquire the rights to access and mine certain coal property either through deeds, leases, or other conveyance agreements. These costs include costs of acquiring, and accessing mineral reserves, resources and surface areas for mining activities.

Mine development begins when the facts and circumstances clearly establish the presence of a commercial mineralized deposit. Capitalized mine development costs represent the costs incurred to prepare mine sites and/or seams of coal for future mining. These costs include costs of acquiring, permitting, planning, research, and developing access to identified mineral reserves and other preparations for commercial production as necessary to develop and permit the properties for mining activities. When components of capitalized mine development costs are replaced with new components, the Company capitalizes the replacement as a separate component and charges off the net book value of the component that was replaced at the cease-use date.

If it is determined that an undeveloped mineral interest cannot be economically converted into proven and probable reserves, capitalized costs are assessed for impairment and future development costs are expensed as incurred. Operating expenditures including certain professional fees and overhead costs are not capitalized but are expensed as incurred.

Mineral rights and capitalized mine development costs are depleted and amortized on a units-of-production basis as mining of that mine’s assigned reserves takes place. Depreciation of plant and equipment is calculated on the straight-line method over their estimated useful lives ranging from three to thirty years.

Advanced Coal Royalties

Advanced Coal Royalties—In most cases, we acquire the right to mine coal reserves under leases which call for the payment of royalties on coal as it is mined and sold. In many cases, these mineral leases require the payment of advance or minimum coal royalties to lessors that are recoupable against future production royalties. These advance payments are deferred and charged to operations as the coal reserves are mined.

Impairment of Long-lived Assets

Impairment of Long-lived Assets—We review and evaluate held-and-used long-lived assets, including property, plant and equipment and mine development costs, for impairment when events or changes in circumstances indicate that the asset or asset group’s carrying value may not be recoverable. Recoverability is measured by comparing the carrying amount of the asset or asset group to the estimated undiscounted future cash flows expected to be generated by the asset or asset group. If the carrying amount of the asset or asset group exceeds its estimated undiscounted future cash flows, an impairment loss is recorded for the excess of the carrying amount over the estimated fair value, if any. We may, under limited circumstances, idle mining operations in response to certain events or conditions. Because an idling is not a permanent closure, it is not considered an automatic indicator of impairment.

Asset Retirement Obligations

Asset Retirement Obligations—Legal obligations associated with the retirement of long-lived assets are initially recognized at their estimated fair value, with a corresponding charge to capitalized development costs, at the time they are incurred. Our asset retirement obligations primarily consist of spending estimates related to reclaiming metallurgical coal land and support facilities in accordance with federal and state reclamation laws as defined by each mining permit. Spending estimates are adjusted for inflation and then discounted at the credit-adjusted, risk-free rate. We record the fair

value of a liability for an asset retirement obligation in the period in which it is incurred and a corresponding increase in the carrying amount of the related long-lived asset. The liability is accreted to its present value each period and the capitalized cost is amortized using the units-of-production method over estimated recoverable reserves upon commencement of mining. We review our asset retirement obligations on at least an annual basis for significant changes in the estimated timing or amount of cash flows.

Occupational Disease (Pneumoconiosis) Obligations. We recognize as a liability to provide for occupational disease (pneumoconiosis) benefits to eligible employees, former employees and dependents as required by the Federal Mine Safety and Health Act of 1969, as amended. The occupational disease benefit obligation represents the present value of the actuarially computed liabilities for such benefits over the employees’ applicable years of service.

Estimating our occupational disease (pneumoconiosis) benefits obligation requires management to make estimates and judgments regarding timing and existence of a liability utilizing third-party actuaries to assist in preparing what constitutes adequate liability amounts. Inherent in the calculation are numerous assumptions and judgments including the ultimate costs, inflation factors, credit adjusted discount rates, timing of settlement awards in the legal and regulatory environments. Adjustments to estimated liabilities due to changes in actuarial assumptions are recorded immediately in earnings in the period in which the change in estimate occurs.

Other Income—We accounted for the SBA Paycheck Protection Program Loan (“PPP Loan”) as an in-substance government grant because we expected to meet the PPP Loan forgiveness eligibility criteria and concluded that the loan represents, in substance, a grant that is expected to be forgiven. Proceeds from the PPP Loan were initially recognized as a deferred income liability. Subsequently, we reduced this liability and recognized income on a systematic basis over the period in which the related costs for which the PPP Loan was intended were incurred. PPP Loan income is presented as other income within the consolidated statements of operations for 2020.

In addition, we recognized $5.4 million associated with the Coronavirus Aid, Relief and Economic Security Act Employee Retention Tax Credit as other income within the consolidated statements of operations for 2021.

Other income

Leases

Leases—We determine if an arrangement is or contains a lease at contract inception, and lease classification is determined at the commencement date. Leases are recognized on the balance sheet as right-of-use (“ROU”) assets and lease liabilities except for leases with a term of 12 months or less.

ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating and finance lease ROU assets and liabilities are recognized at commencement date based on the present value of the fixed lease payments over the lease term. The Company does not separate lease and non-lease components for all leases as permitted under the accounting guidance for leases. As most of our leases do not contain a readily determinable implicit rate, we generally use our incremental borrowing rate based on the estimated rate of interest for collateralized borrowing over a similar term of the lease payments at commencement date. The operating and finance lease ROU assets also include lease prepayments made by the Company and are reduced by any lease incentives received by the Company prior to commencement. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. For operating leases, lease expense is recorded in the income statement based on a straight-line recognition of the total fixed payments over the lease term. For finance leases, accretion of the liability is recognized as interest expense and the ROU asset is amortized separately on a straight-line basis similar to the depreciation of equipment owned by the Company.

Leases of mineral reserves and the related land leases are exempted under U.S. GAAP from recognition on the consolidated balance sheets.

Fair Value Measurements

Fair Value Measurements— Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Assets and liabilities that are recognized or disclosed at fair value are categorized in the fair value hierarchy based on the observability of the inputs utilized in the valuation. The levels of the hierarchy include: Level 1 - inputs are quoted prices in active markets for the identical assets or liabilities; Level 2 - inputs are other than quoted prices included in Level 1 that are directly or

indirectly observable through market-corroborated inputs; and Level 3 - inputs are unobservable, or observable but cannot be market-corroborated, requiring us to make assumptions about pricing by market participants.

The fair values of cash and cash equivalents, accounts receivable, restricted cash, and accounts payable approximate their carrying amounts at each reporting date. The Company’s Senior Notes have an estimated fair value of $36 million and $38 million at December 31, 2022 and 2021, respectively. The fair values of the Company’s Senior Notes were based on observable market prices and were considered a Level 2 measurement at December 31, 2022 and a Level 1 measurement at December 31, 2021 based on trading volumes. The difference between the fair value and carrying amount of the Company’s remaining debts is not material due to the similarity between the terms of the debt agreements and prevailing market terms available to the Company.

Nonrecurring fair value measurements of the Company include asset retirement obligations and estimated values used to allocate the acquisition cost of long-lived assets to individual assets, neither of which are subject to the fair value disclosure requirements.

The fair value of asset retirement obligations is determined as the present value of estimated cash flows related to reclamation obligations, which is likely a Level 3 measurement due the use of unobservable inputs such as estimates regarding the amount and timing of costs to be incurred, the Company’s credit-adjusted discount rate, and inflation rates.

The consideration for the Company’s acquisitions was allocated based on the relative fair values of the assets acquired, the primary asset of which was mineral rights. The fair values of mineral rights were determined based on Level 3 inputs, which are generally unobservable, requiring the Company to make assumptions about future coal prices, capital expenditures, future coal production, costs of production, and an appropriate rate at which to discount the future cash flows.

Income Taxes

Income Taxes—Income tax expense (benefit) includes Federal and state income taxes. Certain income and expenses are not reported in tax returns and financial statements in the same year. The tax effect of such temporary differences is reported as deferred income taxes. We account for deferred income taxes by applying statutory tax rates in effect at the reporting date of the balance sheet. A valuation allowance is established if it is more likely than not that the related tax benefits will not be realized. In determining the appropriate valuation allowance, we consider the projected realization of tax benefits based on expected levels of future taxable income, available tax planning strategies and reversals of existing taxable temporary differences.

Uncertain tax positions are recognized only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. We had no uncertain tax positions requiring liability recognition as of December 31, 2022 and 2021. We file income tax returns in the U.S. and in various state and local jurisdictions which may be routinely examined by tax authorities. The statute of limitations is currently open for all tax returns filed.

Segment Reporting

Segment Reporting—Our properties located in West Virginia, Virginia and Pennsylvania each consist of mineral reserves for production of metallurgical coal from both underground and surface mines. These operations are within the Appalachian basin. Geology, coal transportation routes to customers, regulatory environments and coal quality or type are characteristic to a basin. For financial reporting purposes, these operations represent a single segment because each possesses similar production methods, distribution methods, and customer quality and consumption characteristics, resulting in similar long-term expected financial performance.

The Ramaco Coal acquisition in 2022, as discussed in greater detail in Note 4, provides the Company with royalty savings and controlled mineral rights as well as a research and pilot facility located near Sheridan, Wyoming related to the Company’s possible expansion into the manufacturing and commercialization of advanced carbon products and materials from coal. The Wyoming property includes a thermal coal deposit and permit and is currently undergoing mineral analysis and core drilling to assess potential concentrations of rare earth elements. The Company refers to this potentially new business line as “CORE” (Carbon Ore-Rare Earth), signifying its focus on carbon ore and rare earth elements.

CORE represents a separate operating segment and has economic and geographic differences compared to the Company’s metallurgical operations in the Appalachian basin; however, CORE does not meet the significance tests for separate disclosure as a reportable segment at this time. In addition, reconciling items of the metallurgical coal segment to the Company’s consolidated results are not yet material. The chief operating decision maker does not regularly review segment asset information for the purpose of assessing performance and making resource allocation decisions.

Stock-Based Compensation

Stock-Based Compensation—Compensation cost for equity awards is based on the grant-date fair value of the award and is recognized over the requisite service period. Forfeitures are recognized as they occur.

The fair values of restricted stock and restricted stock unit awards having only a service condition were determined using the publicly-traded price of our common stock on the grant date. The fair value of performance stock units, which vest based on the achievement of relative total shareholder return goals, was determined on the date of grant based on a Monte Carlo simulation. The fair value of stock option awards was calculated using the Black-Scholes option-pricing model. The Black-Scholes model requires us to make assumptions and judgments about the variables used in the calculation, including the expected term, expected volatility, risk-free interest rate, dividend rate and service period.

Concentrations

Concentrations—Our operations are all related to metallurgical coal within the mining industry. A reduction in metallurgical coal prices or other disturbances in the metallurgical coal markets could have an adverse effect on our operations. In 2022, 2021, and 2020, approximately 58%, 51%, and 71%, respectively, of our revenue was derived from coal shipments to customers in North American markets.

Financial instruments that potentially subject us to a significant concentration of credit risk consist primarily of cash and cash equivalents, restricted cash and accounts receivable. We maintain deposits in federally insured financial institutions in excess of federally insured limits. We monitor the credit ratings and concentration of risk with these financial institutions on a continuing basis to safeguard cash deposits.

We have a limited number of customers. Contracts with these customers provide for billings principally upon shipment and compliance with payment terms is monitored on an ongoing basis. Outstanding receivables beyond payment terms are promptly investigated and discussed with the specific customer. We estimate an allowance for doubtful accounts by taking into consideration the age of past due accounts and an assessment of our customers’ ability to pay. An allowance for doubtful accounts was not necessary as of December 31, 2022 and 2021.

During 2022, sales to two customers accounted for approximately 38% of total revenue. The total balance due from these customers at December 31, 2022 was approximately 32% of total accounts receivable. During 2021, sales to three customers accounted for approximately 58% of total revenue. The total balance due from these customers at December 31, 2021 was approximately 58% of total accounts receivable. During 2020, sales to three customers accounted for approximately 70% of total revenue. The number of customers comprising the concentrations above is based on a threshold of 10% or more of total revenues and related receivables.

Recent Accounting Pronouncements Adopted

Recent Accounting Pronouncements Adopted

In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses, which replaces the existing incurred loss impairment model with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. We adopted this standard effective January 1, 2020. The adoption of this ASU did not have a material impact on our consolidated financial statements because we do not have a history of credit losses on our financial instruments and have no material expected losses.

In August 2018, the FASB issued ASU 2018-15, Internal-Use Software, which addresses the accounting for implementation costs associated with a hosted service. The standard provides that implementation costs be evaluated for capitalization using the same criteria as that used for internal-use software development costs, with amortization expense being recorded in the same income statement expense line as the hosted service costs and over the expected term of the

hosting arrangement. We adopted this standard as of January 1, 2020, on a prospective basis. The adoption of this ASU did not have a material impact on our consolidated financial statements.

In December 2019, the FASB issued ASU 2019-12, Income Taxes, which enhances and simplifies various aspects of the income tax accounting guidance, including requirements such as tax basis step-up in goodwill obtained in a transaction that is not a business combination, ownership changes in investments, and interim-period accounting for enacted changes in tax law. The standard was effective for us in the first quarter of 2021. The adoption of this ASU did not have a material impact on our consolidated financial statements.

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, which became effective immediately. The amendments in ASU 2020-04 provide optional relief regarding the accounting effects of reference rate reform, including various types of contract modifications (e.g., debt) as well as hedging relationships. Overall, the guidance permits financial reporting that generally reflects the intended continuation of contracts that reference rates, such as the London Interbank Offered Rate (“LIBOR”), that are expected to be discontinued as a result of reference rate reform initiatives. In December 2022, the FASB issued ASU 2022-06, which defers the sunset date of ASC 848 from December 31, 2022 to December 31, 2024. The Company had previously entered into a term loan that referenced LIBOR; however, this debt was repaid in the fourth quarter of 2022 and, therefore, a contract amendment to replace LIBOR is not required. The Company is unaware of any additional references to rates that will be discontinued under reform initiatives.