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EQUITY METHOD INVESTMENTS - Summary of the operating results of McEwen Copper (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
EQUITY METHOD INVESTMENTS        
Advanced projects $ (895) $ (2,990) $ (2,579) $ (5,444)
Foreign exchange gain (loss) 2,221 (485) 1,926 (394)
Interest and other income (expense) (1,746) (1,734) (3,032) (2,604)
Income (loss) before income and mining taxes 1,929 (15,371) (5,420) (38,311)
Loss from investment in McEwen Copper $ (3,382) $ (12,115) $ (11,450) $ (28,849)
McEwen Copper        
EQUITY METHOD INVESTMENTS        
Subsidiary (as a percent) 100.00% 100.00% 100.00% 100.00%
Advanced projects $ (12,236) $ (37,547) $ (33,507) $ (85,730)
Other expenses (1,548) (1,835) (2,645) (3,851)
Foreign exchange gain (loss) (861) 310 (870) (3,682)
Interest and other income (expense) (381) 3,841 3,525 20,295
Income (loss) before income and mining taxes (15,026) (35,231) (33,497) (72,968)
Net (loss) income and comprehensive (loss) income attributable to McEwen shareholders (15,026) (35,231) (33,497) (72,968)
Loss from investment in McEwen Copper $ (6,978) $ (16,816) $ (15,556) $ (34,828)