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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Revenue        
Less: Refining charges $ (114) $ (126) $ (206) $ (173)
Sales, net 23,993 25,903 39,354 46,557
Gold dore        
Revenue        
Sales, net $ 24,107 $ 26,029 $ 39,560 $ 46,730