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REVENUE - Revenue by Metal (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Revenue $ 166,627 $ 322,846 $ 841,656 $ 1,066,280
Gold        
Disaggregation of Revenue [Line Items]        
Revenue 121,759 276,436 689,847 906,831
Silver        
Disaggregation of Revenue [Line Items]        
Revenue 39,340 36,502 112,043 131,840
Lead        
Disaggregation of Revenue [Line Items]        
Revenue 8,365 4,918 28,393 18,258
Zinc        
Disaggregation of Revenue [Line Items]        
Revenue 993 2,510 9,448 6,738
Other        
Disaggregation of Revenue [Line Items]        
Revenue $ (3,830) $ 2,480 $ 1,925 $ 2,613