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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Inventory [Line Items] |  |  |  |  |
Inventory Write-down | $ 140 | $ 2,330 | $ 1,644 | $ 8,412 |
Concentrates and work-in-progress(1) | 25,556 |  | 25,556 |  | $ 20,893
Inventory Of Ore In Stockpiles | 241 |  | 241 |  | 241
Raw materials and consumables | 2,772 |  | 2,772 |  | 2,823
Inventory, net | 28,569 |  | 28,569 |  | 23,957
Current | 27,420 |  | 27,420 |  | 22,808
Long term - raw materials and consumables | $ 1,149 |  | $ 1,149 |  | $ 1,149

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