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OPERATING SEGMENT REPORTING - Geographic information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets
Non-current Assets	$ 624,198		$ 623,431
Revenue	35,696	$ 41,228
Investment in MSC or McEwen Copper	290,369		298,947
Minera Santa Cruz S.A.
Revenues from External Customers and Long-Lived Assets
Revenue	71,903	65,927
USA
Revenues from External Customers and Long-Lived Assets
Non-current Assets	111,595		100,488
Revenue	22,391	25,278
Canada
Revenues from External Customers and Long-Lived Assets
Non-current Assets	89,779		89,822
Revenue	13,305	14,750
Mexico
Revenues from External Customers and Long-Lived Assets
Non-current Assets	32,337		32,320
Revenue		$ 1,200
Argentina
Revenues from External Customers and Long-Lived Assets
Non-current Assets	390,487		400,801
Argentina \| Minera Santa Cruz S.A.
Revenues from External Customers and Long-Lived Assets
Investment in MSC or McEwen Copper	100,100		101,900
Argentina \| McEwen Copper
Revenues from External Customers and Long-Lived Assets
Investment in MSC or McEwen Copper	$ 290,400		$ 298,900