v3.26.1
EQUITY METHOD INVESTMENTS - Changes in Company's Investment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 15, 2025
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Change in the investment in MSC        
Net Income (Loss)       $ (1,259)
Dilution gain (loss)   $ (162)    
Income tax recovery (expense)   174 $ 1,079  
Change in foreign currency translation adjustments   24   90
Minera Santa Cruz S.A.        
Change in the investment in MSC        
Investment, beginning of period   140,733 101,854 101,854
Attributable net income (loss)   32,953   43,256
Amortization of fair value increments   (199)   (2,160)
Income tax recovery (expense)   (2)   29
Dividend distribution received   (8,835)   (2,246)
Investment, end of period   164,650   140,733
McEwen Copper Inc.        
Change in the investment in MSC        
Investment, beginning of period   274,189 298,947 298,947
Net Income (Loss)   (2,057) (8,578)  
Attributable net income (loss)   (2,074)   (25,547)
Investment, end of period   272,115   274,189
Paragon Advanced Labs Inc.        
Change in the investment in MSC        
Investment, beginning of period   13,719    
Investment in paragon       13,719
Net Income (Loss)   (340)   (340)
Dilution gain (loss) $ 200 (162)    
Change in foreign currency translation adjustments   24   24
Investment, end of period   13,241   $ 13,719
McEwen Copper Inc.        
Change in the investment in MSC        
Net Income (Loss)   (4,443) (18,471)  
Minera Santa Cruz S.A.        
Change in the investment in MSC        
Net Income (Loss)   67,250 2,192  
Attributable net income (loss)   32,953 1,073  
Amortization of fair value increments   (199) (568)  
Income tax recovery (expense)   $ (2) $ 5