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Business Segments
 9 Months Ended
Sep. 30, 2024
Segment Reporting [Abstract]  
Business Segments Business Segments
The Company’s operating segments are: (i) Coal Mining, (ii) NAMining and (iii) Minerals Management. The Company determines its reportable segments by first identifying its 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. The Company’s Chief Operating Decision Maker utilizes operating profit to evaluate segment performance and allocate resources.

The Company has items not directly attributable to a reportable segment that are not included as part of the measurement of segment operating profit. These items primarily include administrative costs related to public company reporting requirements at the parent company and the financial results of Mitigation Resources and Bellaire. Mitigation Resources provides stream and wetland mitigation solutions as well as comprehensive reclamation and restoration construction services. Bellaire manages the Company’s long-term liabilities related to former Eastern U.S. underground mining activities.

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 presents Revenues, Cost of sales, Earnings of unconsolidated operations, Operating expenses, Operating profit (loss), Expenditures for property, plant and equipment and acquisition of mineral interests and Depreciation, depletion and amortization expense:
 THREE MONTHS ENDEDNINE MONTHS ENDED
 SEPTEMBER 30SEPTEMBER 30
 2024 20232024 2023
Revenues
Coal Mining$17,706  $18,665 $48,247 $65,661 
NAMining32,326  21,722 84,729 64,071 
Minerals Management8,849 5,747 24,843 23,203 
Unallocated Items3,745 966 11,573 6,785 
Eliminations(970)(554)(2,102)(1,683)
Total$61,656  $46,546 $167,290 $158,037 
Cost of sales
Coal Mining$18,054 $26,819 $55,135 $85,966 
NAMining31,379 20,286 77,30458,411
Minerals Management1,286 1,064 4,1513,026
Unallocated Items4,622 1,086 11,5014,675
Eliminations(929)(535)(2,081)(1,631)
Total$54,412 $48,720 $146,010 $150,447 
Earnings of unconsolidated operations
Coal Mining$13,821 $11,259 $37,834 $33,687 
NAMining1,122 1,495 3,935 3,975 
Minerals Management213 — 286 — 
Unallocated Items(1)— (1)— 
Total$15,155 $12,754 $42,054 $37,662 
Operating expenses (income)*
Coal Mining$7,147 $7,802 $22,270 $22,441 
NAMining2,543 2,065 6,394 5,725 
Minerals Management1,588 1,073 (731)3,234 
Unallocated Items5,034 5,907 17,191 16,555 
Total$16,312 $16,847 $45,124 $47,955 
Operating profit (loss)    
Coal Mining$19,938  $(4,697)$22,288 $(9,059)
NAMining(474) 866 4,9663,910
Minerals Management6,188 3,610 21,70916,943
Unallocated Items(5,912)(6,027)(17,120)(14,445)
Eliminations(41)(19)(21)(52)
Total$19,699  $(6,267)$31,822 $(2,703)

*Operating expenses (income) consist of Selling, general and administrative expenses, Amortization of intangible assets and (Gain) loss on sale of assets.
THREE MONTHS ENDEDNINE MONTHS ENDED
SEPTEMBER 30SEPTEMBER 30
2024202320242023
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$3,338 $1,469 $7,045 $5,187 
NAMining3,170 21,450 14,156 30,380 
Minerals Management708 776 854 1,758 
Unallocated Items1,080 64 8,642 569 
Total$8,296  $23,759 $30,697 $37,894 
Depreciation, depletion and amortization
Coal Mining$2,154 $4,336 $7,264 $12,924 
NAMining2,672 2,058 7,362 5,799 
Minerals Management1,092 768 3,408 2,328 
Unallocated Items333 158 916 378 
Total$6,251 $7,320 $18,950 $21,429 

Asset information by segment is not discretely maintained for internal reporting or used in evaluating performance.