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SEGMENTED INFORMATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Operating Segments      
Silver $ 14,030 $ 17,259 $ 20,159
Copper 13,953 12,996 8,227
Gold 10,326 9,866 10,131
Penalties, treatment costs and refining charges (6,563) (6,005) (5,158)
Total revenue from mining operations $ 31,746 $ 34,116 $ 33,359