EQUITY METHOD INVESTMENTS - Changes in Company's Investment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Change in the investment in MSC
Investment, beginning of year			$ 326,147
Income tax recovery	$ 2,376	$ 2,049	4,933	$ 2,585
Investment, end of year	291,319		291,319		$ 326,147
McEwen Copper
Change in the investment in MSC
Investment, beginning of year			326,147
Deconsolidation of McEwen Copper					383,968
Attributable net (loss) income			(34,828)		(57,821)
Investment, end of year	291,319		291,319		326,147
Minera Santa Cruz S.A.
Change in the investment in MSC
Investment, beginning of year			93,218	$ 93,451	93,451
Attributable net (loss) income			6,918		4,157
Amortization of fair value increments			(1,377)		(4,612)
Income tax recovery			438		517
Dividend distribution received			(383)		(295)
Investment, end of year	$ 98,814		$ 98,814		$ 93,218