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REVENUE - Revenue by Metal (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Revenue $ 319,583 $ 376,950 $ 675,029 $ 743,434
Gold        
Disaggregation of Revenue [Line Items]        
Revenue 272,471 317,260 568,088 630,394
Silver        
Disaggregation of Revenue [Line Items]        
Revenue 38,739 47,327 72,703 95,340
Lead        
Disaggregation of Revenue [Line Items]        
Revenue 6,170 8,170 20,028 13,340
Zinc        
Disaggregation of Revenue [Line Items]        
Revenue 2,146 3,482 8,455 4,227
Other        
Disaggregation of Revenue [Line Items]        
Revenue $ 57 $ 711 $ 5,755 $ 133