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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Inventory [Line Items] |  |  |
Inventory Write-down | $ 0 | $ 1,078 |
Concentrates and work-in-progress(1) | 25,947 |  | $ 25,768
Inventory Of Ore In Stockpiles | 241 |  | 241
Raw materials and consumables | 3,134 |  | 2,912
Inventory, net | 29,322 |  | 28,921
Current | 27,976 |  | 27,575
Long term - raw materials and consumables | $ 1,346 |  | $ 1,346

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