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INVENTORIES (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
INVENTORIES |  |
Coal | $ 31,066 | $ 19,756
Supplies (net of reserve for obsolescence of $5,554 and $5,547, respectively) | 34,418 | 36,651
Total inventories, net | 65,484 | 56,407
Reserve for obsolescence | $ 5,554 | $ 5,547

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