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Business Segments
 3 Months Ended
Mar. 31, 2023
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, which include primarily administrative costs related to public company reporting requirements at the parent company and the financial results of Mitigation Resources and Bellaire. Mitigation Resources generates and sells stream and wetland mitigation credits (known as mitigation banking) and provides services to those engaged in permittee-responsible stream and wetland mitigation. 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 for income taxes and net income) are presented and discussed within this Form 10-Q on a consolidated basis.
The following tables present revenue, operating profit, capital expenditures and depreciation expense:
 THREE MONTHS ENDED
 MARCH 31
 2023 2022
Revenues
Coal Mining$20,653  $20,962 
NAMining20,633  21,404 
Minerals Management8,285 12,754 
Unallocated Items1,191 192 
Eliminations(621)(289)
Total$50,141  $55,023 
Operating profit (loss)   
Coal Mining$313  $7,352 
NAMining830  1,271 
Minerals Management6,044 11,628 
Unallocated Items(5,353)(5,439)
Eliminations(20)132 
Total$1,814  $14,944 
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$2,686 $1,720 
NAMining4,423 1,820 
Minerals Management344 833 
Unallocated Items426 276 
Total$7,879  $4,649 
Depreciation, depletion and amortization
Coal Mining$4,240 $4,038 
NAMining1,886 1,467 
Minerals Management811 578 
Unallocated Items82 44 
Total$7,019 $6,127