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EQUITY METHOD INVESTMENTS - Summary of the operating results for Paragon (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]      
Revenue $ 74,049 $ 35,696  
Production costs applicable to sales     $ (591)
Gross profit     (279)
Other operating expenses 9,747 (17,710) (749)
Other income (6,338) 1,577 (231)
Net income (loss) and comprehensive income (loss) attributable to McEwen shareholders     (1,259)
Change in foreign currency translation adjustments 24   90
Comprehensive income (loss) 33,403 (6,270) (1,169)
Income (loss) from equity method investment 30,338 $ (8,068)  
Paragon Advanced Labs Inc.      
Schedule of Equity Method Investments [Line Items]      
Net income (loss) and comprehensive income (loss) attributable to McEwen shareholders (340)   (340)
Change in foreign currency translation adjustments $ 24   24
Comprehensive income (loss)     $ (315)
Paragon Advanced Labs Inc.      
Schedule of Equity Method Investments [Line Items]      
Subsidiary (as a percent) 100.00%   100.00%
Revenue     $ 312