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NON-CONTROLLING INTERESTS (Details) - McEwen Copper - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Aug. 23, 2021
Sep. 30, 2021
Noncontrolling Interest    
Percentage of ownership by noncontrolling shareholders   18.60%
Percentage of ownership by company before private placement   100.00%
Nonredeemable non-controlling interest   $ 14.9
Contributed Surplus   $ 25.1
Sale To Related Parties    
Noncontrolling Interest    
Stock issued during the period (in shares) 4,000,000  
Share price $ 10.00  
Gross proceeds from private placement offering $ 40.0  
Percentage of ownership by noncontrolling shareholders   18.60%