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Business Segments | 12 Months Ended
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Dec. 31, 2024
Segment Reporting [Abstract] |
Business Segments | Business Segments Our operating segments are: (i) Coal Mining, (ii) NAMining and (iii) Minerals Management. We determine our reportable segments by first identifying our operating segments, and then by assessing whether any components of these segments constitute a business for which discrete financial information is available and where segment management regularly reviews the operating results of that component. Our President and Chief Executive Officer, who is the CODM, utilizes Operating profit (loss) to evaluate segment performance and allocate resources. Our CODM considers actual, budgeted and forecasted Operating profit (loss) from operations on a monthly basis for evaluating the performance of each segment and making decisions about allocating capital and other resources to each segment. All financial statement line items below operating profit (other income including interest expense and interest income, the provision for income taxes and net income) are presented and discussed within this Form 10-K on a consolidated basis. See Note 1 for additional discussion of our reportable segments. All current operations reside in the U.S. The accounting policies of the reportable segments are described in Note 2. In 2024 and 2023, three customers and two customers, respectively, accounted for more than 10% of consolidated revenue. The following represents the revenue attributable to each of these entities as a percentage of consolidated revenue for those years:
|  |  | Percentage of Consolidated Revenue
| Segment |  | 2024 |  | 2023
| Coal Mining customer |  | 29 | % |  | 40 | %
| NAMining customer |  | 24 | % |  | 22 | %
| NAMining customer |  | 11 | % |  | 7 | %
The following tables provide segment financial information and a reconciliation of segment results to consolidated results for the years ended December 31:
| 2024 |  | 2023 |  |
Revenues |  |  |  |  |
Coal Mining | $ | 68,611 |  |  | $ | 85,415 |  |  |
NAMining | 119,600 |  |  | 90,532 |  |  |
Minerals Management | 34,579 |  |  | 32,985 |  |  |
Unallocated Items | 17,707 |  |  | 8,459 |  |  |
Eliminations | (2,789) |  |  | (2,597) |  |  |
Total | $ | 237,708 |  |  | $ | 214,794 |  |  |
Cost of sales |  |  |  |  |
Coal Mining | $ | 79,375 |  |  | $ | 108,760 |  |  |
NAMining | 110,821 |  |  | 83,719 |  |  |
Minerals Management | 5,234 |  |  | 3,969 |  |  |
Unallocated Items | 15,323 |  |  | 6,252 |  |  |
Eliminations | (2,801) |  |  | (2,497) |  |  |
Total | $ | 207,952 |  |  | $ | 200,203 |  |  |
Earnings of unconsolidated operations |  |  |  |  |
Coal Mining | $ | 51,821 |  |  | $ | 44,633 |  |  |
NAMining | 5,010 |  |  | 5,361 |  |  |
Minerals Management | 647 |  |  | — |  |  |
Unallocated Items | (2) |  |  | — |  |  |
Total | $ | 57,476 |  |  | $ | 49,994 |  |  |
Operating expenses* |  |  |  |  |
Coal Mining | $ | 30,358 |  |  | $ | 92,630 |  |  |
NAMining | 8,017 |  |  | 8,826 |  |  |
Minerals Management | 1,065 |  |  | 9,598 |  |  |
Unallocated Items | 25,699 |  |  | 23,668 |  |  |
Total | $ | 65,139 |  |  | $ | 134,722 |  |  |
*Operating expenses consist of Selling, general and administrative expenses, Amortization of intangible assets, (Gain) loss on sale of assets and Long-lived asset impairment charges.
| 2024 |  | 2023 |  |
Operating profit (loss) |  |  |  |  |
Coal Mining | $ | 24,311 |  |  | $ | (71,342) |  |  |
NAMining | 5,772 |  |  | 3,348 |  |  |
Minerals Management | 28,927 |  |  | 19,418 |  |  |
Unallocated Items | (23,317) |  |  | (21,461) |  |  |
Eliminations | 12 |  |  | (100) |  |  |
Total | $ | 35,705 |  |  | $ | (70,137) |  |  |
Expenditures for property, plant and equipment and acquisition of mineral interests |  |  |  |  |
Coal Mining | $ | 8,292 |  |  | $ | 6,609 |  |  |
NAMining | 30,556 |  |  | 36,073 |  |  |
Minerals Management | 1,079 |  |  | 38,881 |  |  |
Unallocated Items | 15,492 |  |  | 559 |  |  |
Total | $ | 55,419 |  |  | $ | 82,122 |  |  |
Depreciation, depletion and amortization |  |  |  |  |
Coal Mining | $ | 9,476 |  |  | $ | 17,569 |  |  |
NAMining | 9,811 |  |  | 8,172 |  |  |
Minerals Management | 4,273 |  |  | 3,067 |  |  |
Unallocated Items | 1,092 |  |  | 579 |  |  |
Total | $ | 24,652 |  |  | $ | 29,387 |  |  |
Asset information by segment is not discretely maintained for internal reporting or used in evaluating performance.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 48 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-48 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards 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