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Inventories | 3 Months Ended
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Mar. 31, 2025
Inventory Disclosure [Abstract] |
Inventories | Inventories Inventories are summarized as follows:
| MARCH 31 2025 |  | DECEMBER 31 2024
Coal and aggregates | $ | 27,244 |  |  | $ | 27,076 |
Mining supplies | 67,079 |  |  | 67,532 |
Total inventories | $ | 94,323 |  |  | $ | 94,608 |
During the three months ended March 31, 2025 and 2024, we recorded a $3.0 million and $2.5 million inventory impairment charge, respectively, in the line Cost of sales in the accompanying Unaudited Condensed Consolidated Statements of Operations as mining costs exceeded net realizable value of coal inventory at MLMC. Mining supplies inventory consists primarily of critical spare parts to support NAMining’s dragline operations and other general supplies used on day-to-day operations. Mining supplies inventory not expected to be utilized within the next 12 months is classified as long-term on the Unaudited Condensed Consolidated Balance Sheet.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 330 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/330/tableOfContent + Details
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