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EQUITY METHOD INVESTMENTS - Assets and Liabilities associated with McEwen Copper and MSC (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
EQUITY METHOD INVESTMENTS    
Current assets $ 119,374 $ 41,192
Total assets 747,644 664,623
Current liabilities (56,774) (47,693)
Total liabilities (259,080) (169,648)
Difference in proportionate share of net assets 199,700  
McEwen Copper    
EQUITY METHOD INVESTMENTS    
Difference in proportionate share of net assets 30,000  
McEwen Copper    
EQUITY METHOD INVESTMENTS    
Current assets 12,835 34,067
Total assets 206,418 226,329
Current liabilities (35,968) (14,656)
Total liabilities (36,090) (14,856)
Minera Santa Cruz S.A.    
EQUITY METHOD INVESTMENTS    
Current assets 168,155 144,327
Total assets 256,310 233,003
Current liabilities (62,423) (57,373)
Total liabilities $ (98,643) $ (89,594)