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SEGMENTED INFORMATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Operating Segments      
Silver $ 17,259 $ 20,159 $ 23,641
Copper 12,996 8,227 9,593
Gold 9,866 10,131 7,508
Penalties, treatment costs and refining charges (6,005) (5,158) (6,050)
Total revenue from mining operations $ 34,116 $ 33,359 $ 34,692