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Business Segments
 12 Months Ended
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
Segment20242023
Coal Mining customer29 %40 %
NAMining customer24 %22 %
NAMining customer11 %7 %

The following tables provide segment financial information and a reconciliation of segment results to consolidated results for the years ended December 31:
 20242023
Revenues
Coal Mining$68,611 $85,415 
NAMining119,600 90,532 
Minerals Management34,579 32,985 
Unallocated Items17,707 8,459 
Eliminations(2,789)(2,597)
Total$237,708 $214,794 
Cost of sales
Coal Mining$79,375 $108,760 
NAMining110,821 83,719 
Minerals Management5,234 3,969 
Unallocated Items15,323 6,252 
Eliminations(2,801)(2,497)
Total$207,952 $200,203 
Earnings of unconsolidated operations
Coal Mining$51,821 $44,633 
NAMining5,010 5,361 
Minerals Management647 — 
Unallocated Items(2)— 
Total$57,476 $49,994 
Operating expenses*
Coal Mining$30,358 $92,630 
NAMining8,017 8,826 
Minerals Management1,065 9,598 
Unallocated Items25,699 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.
 20242023
Operating profit (loss)
Coal Mining$24,311  $(71,342)
NAMining5,772  3,348 
Minerals Management28,927  19,418 
Unallocated Items(23,317)(21,461)
Eliminations12 (100)
Total$35,705  $(70,137)
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$8,292 $6,609 
NAMining30,556 36,073 
Minerals Management1,079 38,881 
Unallocated Items15,492 559 
Total$55,419 $82,122 
Depreciation, depletion and amortization
Coal Mining$9,476 $17,569 
NAMining9,811 8,172 
Minerals Management4,273 3,067 
Unallocated Items1,092 579 
Total$24,652 $29,387 
Asset information by segment is not discretely maintained for internal reporting or used in evaluating performance.