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REVENUE AND COST OF SALES (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Concentrate sales $ 11,208,000 $ 15,304,000 $ 31,417,000
Provisional pricing adjustments 20,000 718,000 329,000
Total Revenue $ 11,228,000 $ 16,022,000 $ 31,746,000