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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |
Concentrates and work-in-progress | $ 20,893 | $ 14,746
Inventory of ore in stockpiles | 241 | 883
Raw materials and consumables | 2,823 | 2,693
Inventory, net | 23,957 | 18,322
Current | 22,808 | 16,550
Long term - raw materials and consumables | $ 1,149 | $ 1,772

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