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Supplementary Cash Flow Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Supplementary Cash Flow Information |  |  |  |
Unrealized loss (gain) on gold and silver rounds/bullion | $ 55 | $ (716) | $ 86 | $ (1,175)
Unrealized foreign currency exchange (gain) loss | (59) | 163 | 257 | 221
Unrealized loss on zinc zero cost collar | 144 |  | 144 |
Other | (106) | 81 | (12) | 123
Total other operating adjustments | $ 34 | $ (472) | $ 475 | $ (831)

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