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OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets
Non-current Assets	$ 631,892		$ 631,892		$ 623,431
Revenue	50,534	$ 52,250	132,930	$ 140,954
Investment in MSC or McEwen Copper	279,116		279,116		298,947
Minera Santa Cruz S.A.
Revenues from External Customers and Long-Lived Assets
Revenue	91,723	70,361	258,511	210,635
USA
Revenues from External Customers and Long-Lived Assets
Non-current Assets	115,243		115,243		100,488
Revenue	29,427	33,251	79,340	88,215
Canada
Revenues from External Customers and Long-Lived Assets
Non-current Assets	98,097		98,097		89,822
Revenue	20,780	$ 18,999	53,263	51,539
Mexico
Revenues from External Customers and Long-Lived Assets
Non-current Assets	32,253		32,253		32,320
Revenue	327		327	$ 1,200
Argentina
Revenues from External Customers and Long-Lived Assets
Non-current Assets	386,299		386,299		400,801
Argentina | Minera Santa Cruz S.A.
Revenues from External Customers and Long-Lived Assets
Investment in MSC or McEwen Copper	107,200		107,200		101,900
Argentina | McEwen Copper
Revenues from External Customers and Long-Lived Assets
Investment in MSC or McEwen Copper	$ 279,100		$ 279,100		$ 298,900

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