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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 02, 2022
Mar. 31, 2022
Mar. 31, 2021
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
Long-term debt from related party   25.0    
Affiliate of Robert McEwen        
RELATED PARTY TRANSACTIONS        
Debt interest expense   0.6 $ 0.6  
Company Controlled by Mcewen | Commercial Paper        
RELATED PARTY TRANSACTIONS        
Due to Related Parties   $ 15.0    
Related Party Transaction, Interest Rate   8.00%