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REVENUE AND COST OF SALES (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Concentrate sales $ 0 $ 4,237,000 $ 0 $ 11,807,000
Provisional pricing adjustments 0 603,000 29,000 149,000
Total Revenue $ 0 $ 4,840,000 $ 29,000 $ 11,956,000