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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Inventory [Line Items] |  |
Concentrates and work-in-progress | $ 16,683 | $ 14,746
Inventory Of Ore In Stockpiles | 1,139 | 883
Raw materials and consumables | 3,088 | 2,693
Inventory, net | 20,910 | 18,322
Current | 19,138 | 16,550
Long term - raw materials and consumables | $ 1,772 | $ 1,772

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