EQUITY INVESTMENTS - A summary of the operating results of McEwen Copper (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Advanced projects									$ (82,637)	$ (66,728)	$ (12,439)
Foreign exchange loss									59,503	(4,030)	(513)
Interest and other income									36,918	(7,789)	(6,200)
Net income (loss) before tax									(67,036)	80,288	64,199
Net income (loss)	$ (138,453)	$ 18,451	$ 21,627	$ 43,076	$ 37,364	$ 9,976	$ 14,409	$ 19,326	(55,299)	81,075	56,712
Net income (loss) on investment in McEwen Copper									$ (57,759)	$ 2,776	$ (7,533)
McEwen Copper Inc
Schedule of Equity Method Investments [Line Items]
Subsidiary (as a percent)									100.00%
Advanced projects									$ (36,475)
Other expenses									(4,684)
Foreign exchange loss									(99,338)
Interest and other income									19,356
Net income (loss) before tax									(121,141)
Net income (loss)									$ (121,141)
Subsidiary ownership interest (as a percent)	47.70%								47.70%
Net income (loss) on investment in McEwen Copper									$ (57,821)