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REVENUE AND COST OF SALES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
REVENUE AND COST OF SALES        
Concentrate sales $ 21,425 $ 13,974 $ 59,127 $ 40,994
Provisional pricing adjustments (383) 642 2,556 802
Total revenue $ 21,042 $ 14,616 $ 61,683 $ 41,796