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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Supplemental Cash Flow Information Continuing Operations |  |
Interest expense paid |  | $ 25
Income and mining taxes paid | $ 3,898 | 1,915
Non-cash investing activities: |  |
Change in capital expenditures in accounts payable | (72) | (675)
Change in estimate for asset retirement costs | $ 7 | $ (307)

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