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INVENTORIES - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Inventory [Line Items]
Concentrates and work-in-progress	$ 25,746	$ 27,619
Inventory Of Ore In Stockpiles	241	351
Raw materials and consumables	4,369	4,170
Inventory, net	30,356	32,140
Current	28,565	30,772
Long term - raw materials and consumables	$ 1,791	$ 1,368

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