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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Inventory [Line Items]
Inventory Write-down	$ 140	$ 2,330	$ 1,644	$ 8,412
Concentrates and work-in-progress(1)	25,556		25,556		$ 20,893
Inventory Of Ore In Stockpiles	241		241		241
Raw materials and consumables	2,772		2,772		2,823
Inventory, net	28,569		28,569		23,957
Current	27,420		27,420		22,808
Long term - raw materials and consumables	$ 1,149		$ 1,149		$ 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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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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