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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Inventory [Line Items] |  |  |  |
Inventory Write-down | $ 140 | $ 0 | $ 1,644 |
Concentrates and work-in-progress(1) |  | 27,095 |  | $ 25,768
Inventory Of Ore In Stockpiles |  | 241 |  | 241
Raw materials and consumables |  | 3,258 |  | 2,912
Inventory, net |  | 30,594 |  | 28,921
Current |  | 29,248 |  | 27,575
Long term - raw materials and consumables |  | $ 1,346 |  | $ 1,346

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