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INVENTORIES (Tables) | 3 Months Ended
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Mar. 31, 2024
INVENTORIES |
Schedule of inventories | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, | ​ | December 31, | ​
​ | ​ | 2024 |  | 2023 |
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Coal | ​ | $ | 88,108 | ​ | $ | 56,549 | ​
Finished goods (net of reserve for obsolescence of $745 and $728, respectively) | ​ | ​ | 4,174 | ​ | ​ | 3,908 | ​
Work in process | ​ | ​ | 562 | ​ | ​ | 791 | ​
Raw materials | ​ | ​ | 2,097 | ​ | ​ | 2,144 | ​
​ | ​ | ​ | 94,941 | ​ | ​ | 63,392 | ​
Supplies (net of reserve for obsolescence of $7,719 and $7,439, respectively) | ​ |  | 67,256 | ​ |  | 64,164 | ​
Total inventories, net | ​ | $ | 162,197 | ​ | $ | 127,556 | ​

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