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EQUITY METHOD INVESTMENTS - Changes in Company's Investment (Details) - USD ($)
$ in Thousands
 3 Months Ended 4 Months Ended 6 Months Ended 12 Months Ended
Dec. 15, 2025
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2026
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Change in the investment in MSC                
Net Income (Loss)   $ 9,606   $ 3,040   $ 42,985 $ (3,230)  
Income tax recovery (expense)   3,816   1,111   3,990 2,190  
Change in foreign currency translation adjustments   (3)       21    
Minera Santa Cruz S.A.                
Change in the investment in MSC                
Investment, beginning of period     $ 140,733     140,733 101,854 $ 101,854
Attributable net income (loss)   17,483   4,109   50,435 5,182 43,256
Amortization of fair value increments   (181)   (523)   (380) (1,091) (2,160)
Income tax recovery (expense)   4   10   2 15 29
Dividend distribution received           (58,283)   (2,246)
Investment, end of period   132,507       132,507   140,733
McEwen Copper Inc.                
Change in the investment in MSC                
Investment, beginning of period     274,189     274,189 298,947 298,947
Net Income (Loss)   (5,405)   $ (6,978)   (7,462) $ (15,556)  
Dilution gain (loss)               789
Attributable net income (loss)           (7,508)   (25,547)
Investment, end of period   266,681       266,681   274,189
Paragon Advanced Labs Inc.                
Change in the investment in MSC                
Investment, beginning of period     13,719     13,719    
Investment in paragon               13,719
Net Income (Loss)     (660)   $ (999) (999)    
Dilution gain (loss) $ 200         (170)    
Change in foreign currency translation adjustments     $ (3)   $ 21 21    
Investment, end of period   $ 12,571       $ 12,571   $ 13,719