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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Inventory [Line Items]
Inventory Write-down	$ 430	$ 4,910	$ 1,506	$ 6,082
Concentrates and work-in-progress(1)	24,771		24,771		$ 20,893
Inventory Of Ore In Stockpiles	241		241		241
Raw materials and consumables	2,713		2,713		2,823
Inventory, net	27,725		27,725		23,957
Current	26,576		26,576		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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Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle.

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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 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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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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