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EQUITY METHOD INVESTMENTS - Reconciliation of the Company's equity method investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]    
Total equity method investments $ 411,759 $ 428,641
Investment in McEwen Copper Inc.    
Schedule of Equity Method Investments [Line Items]    
Total equity method investments 266,681 274,189
Investment in Minera Santa Cruz S.A.    
Schedule of Equity Method Investments [Line Items]    
Total equity method investments 132,507 140,733
Investment in Paragon Advanced Labs Inc.    
Schedule of Equity Method Investments [Line Items]    
Total equity method investments $ 12,571 $ 13,719