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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 02, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Aug. 10, 2018
RELATED PARTY TRANSACTIONS              
Sale of flow-through common stock $ 14.4            
Chairman and Chief Executive Officer | Term Loan              
RELATED PARTY TRANSACTIONS              
Face amount   $ 50.0   $ 50.0     $ 50.0
Long-term debt from related party   25.0   25.0      
Affiliate of Robert McEwen              
RELATED PARTY TRANSACTIONS              
Debt interest expense   $ 0.6 $ 0.6 $ 1.2 $ 1.2    
Company Controlled by Mcewen | Commercial Paper              
RELATED PARTY TRANSACTIONS              
Due to Related Parties           $ 15.0  
Related Party Transaction, Interest Rate           8.00%