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EQUITY METHOD INVESTMENTS - A summary of the operating results of Minera Santa Cruz S.A. (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
EQUITY METHOD INVESTMENTS        
Revenue from gold and silver sales $ 50,534 $ 52,250 $ 132,930 $ 140,954
Depreciation and depletion (7,485) (8,765) (20,192) (23,524)
Other expense 8,328 (86) 16,955 136
Income (loss) before income and mining taxes (1,731) (1,267) (7,151) (39,578)
Income tax recovery 1,269 (814) 3,459 4,119
Income from investment in MSC, net of amortization $ (806) $ (3,080) $ (12,256) $ (31,929)
Minera Santa Cruz S.A.        
EQUITY METHOD INVESTMENTS        
Subsidiary (as a percent) 100.00% 100.00% 100.00% 100.00%
Revenue from gold and silver sales $ 91,723 $ 70,361 $ 258,511 $ 210,635
Production costs applicable to sales (50,053) (58,031) (170,243) (154,136)
Depreciation and depletion (16,571) (13,248) (37,793) (36,897)
Gross profit 25,099 (918) 50,475 19,602
Exploration (3,785) (3,329) (9,000) (8,451)
Other expense (4,550) 1,649 (8,245) 699
Income (loss) before income and mining taxes 16,764 (2,598) 33,230 11,850
Current and deferred taxes (8,676) 1,280 (14,567) 947
Net (loss) income and comprehensive (loss) income attributable to McEwen shareholders 8,088 (1,318) 18,663 12,797
Net income 3,963 (646) 9,145 6,271
Amortization of fair value increments (504) (833) (1,594) (2,209)
Income tax recovery 10 251 24 689
Income from investment in MSC, net of amortization $ 3,469 $ (1,228) $ 7,575 $ 4,751