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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Concentrates and work-in-progress	$ 25,768	$ 20,893
Inventory of ore in stockpiles	241	241
Raw materials and consumables	2,912	2,823
Inventory, net	28,921	23,957
Current	27,575	22,808
Long term - raw materials and consumables	$ 1,346	$ 1,149

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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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