EQUITY METHOD INVESTMENTS - Changes in Company's Investment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Change in the investment in MSC
Additional investment		$ 14,000
Dilution gain	$ 789	5,777
Deconsolidation of McEwen Copper	86,800
Income tax recovery	27,485	3,048	$ (33,859)
Dividend distribution received	(2,246)
Minera Santa Cruz S.A.
Change in the investment in MSC
Investment, beginning of period	101,854	93,218
Attributable net income (loss)	43,256	12,072
Amortization of fair value increments	(2,160)	(3,088)
Income tax recovery	29	37
Dividend distribution received	(2,246)	(385)
Investment, end of period	140,733	101,854	93,218
McEwen Copper Inc.
Change in the investment in MSC
Investment, beginning of period	298,947	326,147
Additional investment		14,000
Dilution gain	789	5,777
Attributable net income (loss)	(25,547)	(46,977)
Investment, end of period	274,189	298,947	326,147
McEwen Copper Inc.
Change in the investment in MSC
Dilution gain	800
Deconsolidation of McEwen Copper			86,820
Minera Santa Cruz S.A.
Change in the investment in MSC
Attributable net income (loss)	43,256	12,072	4,157
Amortization of fair value increments	(2,160)	(3,088)	(4,612)
Income tax recovery	$ 29	$ 37	$ 517