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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Inventory [Line Items] |  |
Concentrates and work-in-progress | $ 26,613 | $ 27,619
Inventory Of Ore In Stockpiles | 241 | 351
Raw materials and consumables | 4,502 | 4,170
Inventory, net | 31,356 | 32,140
Current | 29,709 | 30,772
Long term - raw materials and consumables | $ 1,647 | $ 1,368

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