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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Inventory [Line Items] |  |  |  |  |
Inventory Write-down | $ 4,906 | $ 1,339 | $ 6,082 | $ 2,349 |
Concentrates and work-in-progress | 16,725 |  | 16,725 |  | $ 14,746
Inventory Of Ore In Stockpiles | 749 |  | 749 |  | 883
Raw materials and consumables | 2,872 |  | 2,872 |  | 2,693
Inventory, net | 20,346 |  | 20,346 |  | 18,322
Current | 18,574 |  | 18,574 |  | 16,550
Long term - raw materials and consumables | $ 1,772 |  | $ 1,772 |  | $ 1,772

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