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REVENUE AND COST OF SALES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
REVENUE AND COST OF SALES        
Concentrate Sales $ 13,974 $ 11,599 $ 40,994 $ 31,429
Provisional Pricing Adjustments 642 717 802 (70)
Total Revenue $ 14,616 $ 12,316 $ 41,796 $ 31,359