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Supplementary Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Supplementary Cash Flow Information        
Unrealized gain on gold and silver rounds/bullion     $ (1,175) $ (550)
Unrealized foreign currency exchange loss $ 163 $ 406 221 294
Increase in reserve for inventory   $ 478   478
Other     139 92
Total other operating adjustments     $ (815) $ 314