OPERATING SEGMENT REPORTING - Reportable Operating Segments (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	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Segment Reporting
Revenue from gold and silver sales	$ 33,523	$ 52,250	$ 47,476	$ 41,228	$ 58,680	$ 38,404	$ 34,395	$ 34,752	$ 174,477	$ 166,231	$ 110,417
Depreciation and depletion									(30,229)	(29,221)	(19,701)
Gross profit (loss)	$ 363	$ 13,803	$ 10,758	$ 6,011	$ 13,050	$ 3,755	$ (3,468)	$ 4,443	30,935	17,780	(544)
Exploration									$ (16,546)	$ (20,167)	$ (14,973)
Segment Reporting, Other Segment Item, Composition, Description									Other segment items include:	Other segment items include:	Other segment items include:
Dilution gain from investments in McEwen Copper Inc.									$ 5,777
Gain on deconsolidation of McEwen Copper Inc.										$ 222,157
General and administrative									(17,165)	(15,449)	$ (11,890)
Depreciation									(634)	(1,138)	(733)
Interest and other finance expense									(3,033)	(5,598)	(6,497)
Other income (expense)									(2,651)	29,976	(22,938)
(Loss) income before income and mining taxes									(46,739)	67,036	(80,288)
Capital expenditures									43,095	26,198	26,234
Operating segment
Operating Segment Reporting
Revenue from gold and silver sales									174,477	166,231	110,417
Production costs applicable to sales									(113,313)	(119,230)	(91,260)
Depreciation and depletion									(30,229)	(29,221)	(19,701)
Gross profit (loss)									30,935	17,780	(544)
Advanced projects									(7,152)	(82,637)	(66,728)
Exploration									(16,546)	(20,167)	(14,973)
Income (loss) from equity method investments									(37,956)	(57,759)	2,776
Other segment items									(5,278)	371	10,579
Segment profit (loss)									(35,997)	(142,412)	(68,890)
Corporate non segment
Operating Segment Reporting
General and administrative									(13,303)	(7,335)	(4,111)
Depreciation									(475)	(510)	(497)
Other income (expense)									292	734	(293)
USA | Operating segment
Operating Segment Reporting
Revenue from gold and silver sales									105,147	83,409	47,926
Production costs applicable to sales									(63,547)	(67,335)	(43,500)
Depreciation and depletion									(12,657)	(7,130)	(4,737)
Gross profit (loss)									28,943	8,944	(311)
Advanced projects											(52)
Exploration									(8,420)	(6,225)	(4,828)
Other segment items									(1,968)	(1,891)	(1,823)
Segment profit (loss)									18,555	828	(7,014)
Capital expenditures									17,789	9,028	5,374
Canada | Operating segment
Operating Segment Reporting
Revenue from gold and silver sales									67,808	81,295	60,848
Production costs applicable to sales									(49,766)	(51,895)	(36,845)
Depreciation and depletion									(17,572)	(22,091)	(14,964)
Gross profit (loss)									470	7,309	9,039
Advanced projects											(1,206)
Exploration									(8,126)	(13,556)	(9,443)
Other segment items									334	(220)	(546)
Segment profit (loss)									(7,322)	(6,467)	(2,156)
Capital expenditures									23,288	9,131	15,317
Mexico | Operating segment
Operating Segment Reporting
Revenue from gold and silver sales									1,522	1,527	1,643
Production costs applicable to sales											(10,915)
Gross profit (loss)									1,522	1,527	(9,272)
Advanced projects									(7,152)	(6,292)	(4,322)
Exploration											(2)
Other segment items									(3,644)	(5,002)	(1,513)
Segment profit (loss)									(9,274)	(9,767)	(15,109)
Capital expenditures									$ 2,018	$ 1,258	$ 2,800
MSC
Operating Segment Reporting
Subsidiary (as a percent)									100.00%	100.00%	100.00%
MSC | Operating segment
Operating Segment Reporting
Income (loss) from equity method investments									$ 9,021	$ 62	$ 2,776
Segment profit (loss)									9,021	62	2,776
McEwen Copper | Operating segment
Operating Segment Reporting
Advanced projects										(76,345)	(61,148)
Exploration										(386)	(700)
Income (loss) from equity method investments									(46,977)	(57,821)
Other segment items										7,484	14,461
Segment profit (loss)									$ (46,977)	(127,068)	(47,387)
Capital expenditures										$ 6,781	$ 2,743