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v3.23.1

Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Segment Reporting Information [Line Items] |  |
Revenues | $ 50,141 | $ 55,023
Operating profit (loss) | 1,814 | 14,944
Expenditures for property, plant and equipment and acquisition of mineral interests | 7,879 | 4,649
Depreciation, depletion and amortization | 7,019 | 6,127
Operating segments | Coal Mining |  |
Segment Reporting Information [Line Items] |  |
Revenues | 20,653 | 20,962
Operating profit (loss) | 313 | 7,352
Expenditures for property, plant and equipment and acquisition of mineral interests | 2,686 | 1,720
Depreciation, depletion and amortization | 4,240 | 4,038
Operating segments | NAMining |  |
Segment Reporting Information [Line Items] |  |
Revenues | 20,633 | 21,404
Operating profit (loss) | 830 | 1,271
Expenditures for property, plant and equipment and acquisition of mineral interests | 4,423 | 1,820
Depreciation, depletion and amortization | 1,886 | 1,467
Operating segments | Minerals Management |  |
Segment Reporting Information [Line Items] |  |
Revenues | 8,285 | 12,754
Operating profit (loss) | 6,044 | 11,628
Expenditures for property, plant and equipment and acquisition of mineral interests | 344 | 833
Depreciation, depletion and amortization | 811 | 578
Unallocated Items |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1,191 | 192
Operating profit (loss) | (5,353) | (5,439)
Expenditures for property, plant and equipment and acquisition of mineral interests | 426 | 276
Depreciation, depletion and amortization | 82 | 44
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Revenues | (621) | (289)
Operating profit (loss) | $ (20) | $ 132

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