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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%

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