EQUITY METHOD INVESTMENTS - Summary of the operating results of McEwen Copper (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
EQUITY METHOD INVESTMENTS
Advanced projects										$ (7,152)	$ (6,292)	$ (5,580)
Foreign exchange gain (loss)										1,459	(59,503)	4,030
Interest and other income										(4,595)	36,918	(7,789)
(Loss) income before income and mining taxes										(46,739)	67,036	(80,288)
Net (loss) income and comprehensive (loss) income attributable to McEwen shareholders	$ (8,232)	$ (2,081)	$ (12,995)	$ (20,383)		$ 138,453	$ (18,451)	$ (21,627)	$ (43,076)	$ (43,691)	$ 55,299	$ (81,075)
McEwen Copper
EQUITY METHOD INVESTMENTS
Subsidiary (as a percent)										100.00%	100.00%	100.00%
Advanced projects					$ (36,475)					$ (114,544)
Other expenses					(4,684)					(6,196)
Foreign exchange gain (loss)					(99,338)					2,631
Interest and other income					19,356					19,130
(Loss) income before income and mining taxes					(121,141)					(98,979)
Net (loss) income and comprehensive (loss) income attributable to McEwen shareholders					(121,141)					(98,979)
Loss from investment in McEwen Copper					$ (57,821)					$ (46,977)	$ (57,821)