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INVENTORIES (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
INVENTORIES |  |
Coal | $ 38,531 | $ 63,645
Supplies (net of reserve for obsolescence of $5,577 and $5,555, respectively) | 36,348 | 37,660
Total inventories, net | 74,879 | 101,305
Reserve for obsolescence | $ 5,577 | $ 5,555

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