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REVENUE AND COST OF SALES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Concentrate sales $ 1,881 $ 2,157 $ 1,881 $ 13,964
Provisional pricing adjustments 0 502 29 651
Total Revenue $ 1,881 $ 2,659 $ 1,910 $ 14,615