Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying Consolidated Financial Statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States (“GAAP”) for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. Operating results for the three and six months ended June 30, 2025 are not necessarily indicative of the results that may be expected for future periods.

The Consolidated Balance Sheet at December 31, 2024 has been derived from the Audited Consolidated Financial Statements at that date but does not include all disclosures required by GAAP. This Quarterly Report on Form 10-Q should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2024.

All dollar amounts discussed in these Notes to Consolidated Financial Statements are in thousands of U.S. dollars, except for share and per share amounts, and unless otherwise indicated.

Basis of Consolidation

Basis of Consolidation

The Consolidated Financial Statements include the accounts of Core Natural Resources, Inc. and its wholly-owned and majority-owned and/or controlled subsidiaries (including Arch) as of June 30, 2025. All intercompany transactions and accounts have been eliminated in consolidation. Upon closing of the Merger with Arch (see Note 2), the Company acquired a 35% interest in the Dominion Terminal, a ground storage-to-vessel coal transloading facility in Newport News, Virginia operated by DTA. The Company has the ability to exercise significant influence, but not control, over DTA and accordingly, the investment in DTA is accounted for under the equity method.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In November 2024, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40). The amendments in this update aim to improve the disclosures about a public business entity’s expenses and address requests from investors for more detailed information about the types of expenses in commonly presented expense captions. The amendments in this update require that public business entities, at each interim period and on an annual basis: (1) disclose the amounts of (a) purchases of inventory, (b) employee compensation, (c) depreciation, (d) intangible asset amortization, and (e) depreciation, depletion and amortization recognized as part of oil- and gas-producing activities (or other amounts of depletion expense) included in each relevant expense caption; (2) include certain amounts that are already required to be disclosed under current generally accepted accounting principles; (3) disclose a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively; and (4) disclose the total amount of selling expenses and, in annual reporting periods, an entity’s definition of selling expenses. The amendments in this update are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. These amendments may be applied either prospectively or retrospectively. Management is currently evaluating the impact of this guidance, but with the exception of the increased disclosures summarized above, does not expect this update to have a material impact on the Company's financial statements.

(Loss) Earnings per Share

(Loss) Earnings per Share

Basic (loss) earnings per share are computed by dividing net (loss) income by the weighted-average number of shares outstanding during the reporting period. Dilutive (loss) earnings per share are computed similarly to basic (loss) earnings per share, except that the weighted-average number of shares outstanding is increased to include additional shares from restricted stock units and performance share units, if dilutive. The number of additional shares is calculated by assuming that outstanding restricted stock units and performance share units were released, and that the proceeds from such activities, as applicable, were used to acquire shares of common stock at the average market price during the reporting period.

Reclassifications

Reclassifications

Certain amounts in prior periods have been reclassified to conform with the report classifications of the current period, such as the reclassification of Merger-Related Expenses to General and Administrative Costs. These reclassifications had no effect on previously reported total net (loss) income, assets, stockholders' equity, or cash flows from operating activities, nor do they affect key metrics used by the Company's chief operating decision maker (“CODM”) to evaluate performance.