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Business Segments
 3 Months Ended
Mar. 31, 2025
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 Chief Operating Decision Maker (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. See Note 1 for a discussion of our reportable segments.

All financial statement line items below operating profit (other income including interest expense and interest income, the provision (benefit) for income taxes and net income) are presented and discussed within this Form 10-Q on a consolidated basis.
The following table provides segment financial information and a reconciliation of segment results to consolidated results:
 THREE MONTHS ENDED
 MARCH 31
 2025 2024
Revenues
Coal Mining$19,239 $15,545 
NAMining31,526 24,483 
Minerals Management10,902 10,401 
Unallocated Items4,400 3,262 
Eliminations(496)(402)
Total$65,571 $53,289 
Cost of sales
Coal Mining$22,570 $20,943 
NAMining28,37821,671
Minerals Management2,2441,364
Unallocated Items3,2372,712
Eliminations(512)(419)
Total$55,917 $46,271 
Earnings of unconsolidated operations
Coal Mining$14,463 $12,007 
NAMining969 1,365 
Minerals Management554 (65)
Total$15,986 $13,307 
Operating expenses*
Coal Mining$7,341 $7,026 
NAMining2,147 1,822 
Minerals Management1,305 1,042 
Unallocated Items7,165 5,678 
Total$17,958 $15,568 
Operating profit (loss)
Coal Mining$3,791 $(417)
NAMining1,9702,355
Minerals Management7,9077,930
Unallocated Items(6,002)(5,128)
Eliminations1617
Total$7,682 $4,757 

*Operating expenses consist of Selling, general and administrative expenses, Amortization of intangible assets and (Gain) loss on sale of assets.
THREE MONTHS ENDED
MARCH 31
20252024
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$617 $1,794 
NAMining6,754 5,818 
Minerals Management807 136 
Unallocated Items630 6,735 
Total$8,808 $14,483 
Depreciation, depletion and amortization
Coal Mining$2,018 $2,214 
NAMining2,702 2,256 
Minerals Management1,908 993 
Unallocated Items165 229 
Total$6,793 $5,692 
March 31
2025		December 31
2024
 Total assets
Coal Mining$116,649 $125,301 
NAMining210,990 204,889 
Minerals Management99,702 99,905 
Unallocated Items**
206,846 201,592 
Total$634,187 $631,687 

**Unallocated Items consist primarily of Cash and cash equivalents, assets of growth businesses, Deferred income taxes and Investments in unconsolidated subsidiaries.