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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Concentrates and work-in-progress	$ 27,619	$ 25,768
Inventory of ore in stockpiles	351	241
Raw materials and consumables	4,170	2,912
Inventory, net	32,140	28,921
Current	30,772	27,575
Long term - raw materials and consumables	$ 1,368	$ 1,346

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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