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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Thousands
9 Months Ended
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)