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OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets
Non-current Assets	$ 627,954		$ 627,954		$ 623,431
Revenue	46,700	$ 47,476	82,396	$ 88,704
Investment in MSC or McEwen Copper	283,391		283,391		298,947
Minera Santa Cruz S.A.
Revenues from External Customers and Long-Lived Assets
Revenue	94,886	74,348	166,789	140,274
USA
Revenues from External Customers and Long-Lived Assets
Non-current Assets	114,550		114,550		100,488
Revenue	27,523	29,686	49,913	54,964
Canada
Revenues from External Customers and Long-Lived Assets
Non-current Assets	94,201		94,201		89,822
Revenue	19,177	$ 17,790	32,483	32,540
Mexico
Revenues from External Customers and Long-Lived Assets
Non-current Assets	32,098		32,098		32,320
Revenue				$ 1,200
Argentina
Revenues from External Customers and Long-Lived Assets
Non-current Assets	387,105		387,105		400,801
Argentina | Minera Santa Cruz S.A.
Revenues from External Customers and Long-Lived Assets
Investment in MSC or McEwen Copper	103,700		103,700		101,900
Argentina | McEwen Copper
Revenues from External Customers and Long-Lived Assets
Investment in MSC or McEwen Copper	$ 283,400		$ 283,400		$ 298,900

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