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REVENUE AND COST OF SALES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
REVENUE AND COST OF SALES        
Concentrate Sales $ 9,838 $ 11,189 $ 19,830 $ 20,978
Provisional Pricing Adjustments (620) (1,819) (787) (558)
Total Revenue $ 9,218 $ 9,370 $ 19,043 $ 20,420