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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Inventory [Line Items]
Concentrates and work-in-progress(1)	$ 22,399		$ 20,893
Inventory of ore in stockpiles	241		241
Raw materials and consumables	2,870		2,823
Inventory, net	25,510		23,957
Current	24,361		22,808
Long term - raw materials and consumables	1,149		$ 1,149
Impairment of inventories	$ 1,078	$ 1,176

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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