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REVENUE - Revenue by Metal (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Revenue $ 355,446 $ 366,484
Gold    
Disaggregation of Revenue [Line Items]    
Revenue 295,617 313,135
Silver    
Disaggregation of Revenue [Line Items]    
Revenue 33,965 48,013
Lead    
Disaggregation of Revenue [Line Items]    
Revenue 13,857 5,170
Zinc    
Disaggregation of Revenue [Line Items]    
Revenue 6,310 745
Other    
Disaggregation of Revenue [Line Items]    
Revenue $ 5,697 $ (579)