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REVENUE - Narrative (Details) - Concentrate Metal Sales Agreement
oz in Thousands, lb in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
oz
lb
$ / pound
$ / Ounce
Jun. 30, 2023
USD ($)
$ / pound
$ / Ounce
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
$ / pound
$ / Ounce
Jun. 30, 2022
USD ($)
Disaggregation of Revenue [Line Items]          
Embedded derivative, increase (decrease) of value | $   $ 4.1 $ (3.0) $ 11.6 $ 1.3
Silver          
Disaggregation of Revenue [Line Items]          
Notional ounce/pound | oz 3,480        
Average price per ounce/pound | $ / Ounce 24.04 24.04   24.04  
Zinc          
Disaggregation of Revenue [Line Items]          
Notional ounce/pound | lb 3,150        
Average price per ounce/pound | $ / pound 1.09 1.09   1.09  
Lead          
Disaggregation of Revenue [Line Items]          
Notional ounce/pound | lb 18,920        
Average price per ounce/pound | $ / pound 0.95 0.95   0.95