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INVENTORIES (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Inventory |  |
Coal | $ 88,108 | $ 56,549
Finished goods (net of reserve for obsolescence) | 4,174 | 3,908
Work in process | 562 | 791
Raw materials | 2,097 | 2,144
Total operating inventories, net | 94,941 | 63,392
Supplies (net of reserve for obsolescence) | 67,256 | 64,164
Total inventories, net | 162,197 | 127,556
Reduce inventory carrying value to market | 7,300 |
Manufactured goods |  |
Inventory |  |
Reserve for obsolescence | 745 | 728
Supplies |  |
Inventory |  |
Reserve for obsolescence | $ 7,719 | $ 7,439

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