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EQUITY INVESTMENTS - Changes in Company's Investment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in the investment in MSC      
Income tax recovery $ (33,859) $ (5,806) $ 7,315
Dividend distribution received (295) (286) (9,832)
Investment, end of year 326,147    
McEwen Copper      
Change in the investment in MSC      
Deconsolidation 383,968    
Attributable net (loss) income (57,821)    
Investment, end of year 326,147    
Minera Santa Cruz S.A.      
Change in the investment in MSC      
Investment, beginning of year 93,451 90,961  
Attributable net (loss) income 4,157 6,303 132
Amortization of fair value increments (4,612) (4,155) (8,331)
Income tax recovery 517 628 666
Investment, end of year $ 93,218 $ 93,451 $ 90,961