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EQUITY METHOD INVESTMENTS - Summary of the operating results of Minera Santa Cruz S.A. (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
EQUITY METHOD INVESTMENTS      
Revenue from gold and silver sales $ 74,049 $ 35,696  
Production costs applicable to sales     $ (591)
Depreciation and depletion (6,910) (6,021)  
Gross profit     (279)
Other income (6,338) 1,577 (231)
Income (loss) before income and mining taxes 33,205 (7,349)  
Net income (loss) and comprehensive income (loss) attributable to McEwen shareholders     $ (1,259)
Income tax recovery (expense) 174 1,079  
Loss from investment in McEwen Copper 30,338 (8,068)  
Income (loss) from equity method investment $ 30,338 $ (8,068)  
Minera Santa Cruz S.A.      
EQUITY METHOD INVESTMENTS      
Subsidiary (as a percent) 100.00% 100.00%  
Revenue from gold and silver sales $ 185,813 $ 71,903  
Production costs applicable to sales (77,655) (56,588)  
Depreciation and depletion (7,896) (10,610)  
Gross profit 100,262 4,705  
Exploration (4,341) (2,300)  
Other income 2,600 826  
Income (loss) before income and mining taxes 98,521 3,231  
Current and deferred taxes (31,271) (1,039)  
Net income (loss) and comprehensive income (loss) attributable to McEwen shareholders 67,250 2,192  
Net income 32,953 1,073  
Amortization of fair value increments (199) (568)  
Income tax recovery (expense) (2) 5  
Loss from investment in McEwen Copper $ 32,752 $ 510