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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Inventory Disclosure [Abstract] |  |
Concentrates and work-in-progress | $ 14,746 | $ 14,118
Inventory of ore in stockpiles | 883 | 0
Raw materials and consumables | 2,693 | 2,432
Inventory, net | 18,322 | 16,550
Current | 16,550 | 16,550
Long term - raw materials and consumables | $ 1,772 | $ 0

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