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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Concentrates and work-in-progress	$ 20,893	$ 14,746
Inventory of ore in stockpiles	241	883
Raw materials and consumables	2,823	2,693
Inventory, net	23,957	18,322
Current	22,808	16,550
Long term - raw materials and consumables	$ 1,149	$ 1,772

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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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