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REVENUE AND COST OF SALES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
REVENUE AND COST OF SALES        
Concentrate Sales $ 11,599 $ 9,445 $ 31,429 $ 30,423
Provisional Pricing Adjustments 717 (327) (70) (885)
Total Revenue $ 12,316 $ 9,118 $ 31,359 $ 29,538