OPERATING SEGMENT REPORTING - Summary of Reportable Operating Segments (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
Operating Segment Reporting
Revenue	$ 58,680	$ 38,404	$ 34,395	$ 34,752	$ 28,240	$ 25,988	$ 30,647	$ 25,542	$ 166,231	$ 110,417	$ 136,541
Depreciation and depletion									(29,221)	(19,701)	(23,798)
Gross profit (loss)	$ 13,050	$ 3,755	$ (3,468)	$ 4,443	$ (288)	$ 1,503	$ 4,235	$ (5,994)	17,780	(544)	(6,480)
Advanced projects									(82,637)	(66,728)	(12,439)
Income (Loss) from equity investments									(57,759)	2,776	(7,533)
Segment income (loss)									(142,783)	(79,469)	(49,056)
Gain on Deconsolidation of McEwen Copper									222,157
General and Administrative and other									(12,338)	(819)	(15,143)
Loss before income and mining taxes									67,036	(80,288)	(64,199)
Capital expenditures									26,198	26,234	36,033
USA
Operating Segment Reporting
Depreciation and depletion									(7,130)	(4,737)	(8,502)
Gross profit (loss)									8,944	(311)	(3,287)
Advanced projects										(52)	(440)
Segment income (loss)									2,719	(5,191)	(9,602)
Capital expenditures									9,028	5,374	2,416
Canada
Operating Segment Reporting
Depreciation and depletion									(22,091)	(14,964)	(15,296)
Gross profit (loss)									7,309	9,039	2,447
Advanced projects										(1,206)	(2,635)
Segment income (loss)									(6,247)	(1,610)	(15,205)
Capital expenditures									9,131	15,317	33,617
Mexico
Operating Segment Reporting
Gross profit (loss)									1,527	(9,272)	(5,640)
Advanced projects									(6,292)	(4,322)	(4,345)
Segment income (loss)									(4,765)	(13,596)	(9,999)
Capital expenditures									1,258	2,800
MSC
Operating Segment Reporting
Income (Loss) from equity investments									62	2,776	(7,533)
Segment income (loss)									62	2,776	(7,533)
McEwen Copper
Operating Segment Reporting
Advanced projects									(76,345)	(61,148)	(5,019)
Income (Loss) from equity investments									(57,821)
Segment income (loss)									(134,552)	(61,848)	(6,717)
Capital expenditures									6,781	2,743
Gold and silver sales
Operating Segment Reporting
Revenue									166,231	110,417	136,541
Gold and silver sales | USA
Operating Segment Reporting
Revenue									83,409	47,926	79,205
Gold and silver sales | Canada
Operating Segment Reporting
Revenue									81,295	60,848	50,704
Gold and silver sales | Mexico
Operating Segment Reporting
Revenue									1,527	1,643	6,632
Production costs applicable to sales
Operating Segment Reporting
Production costs applicable to sales									(119,230)	(91,260)	(119,223)
Production costs applicable to sales | USA
Operating Segment Reporting
Production costs applicable to sales									(67,335)	(43,500)	(73,990)
Production costs applicable to sales | Canada
Operating Segment Reporting
Production costs applicable to sales									(51,895)	(36,845)	(32,961)
Production costs applicable to sales | Mexico
Operating Segment Reporting
Production costs applicable to sales										(10,915)	(12,272)
Exploration
Operating Segment Reporting
Production costs applicable to sales									(20,167)	(14,973)	(22,604)
Exploration | USA
Operating Segment Reporting
Production costs applicable to sales									(6,225)	(4,828)	(5,875)
Exploration | Canada
Operating Segment Reporting
Production costs applicable to sales									(13,556)	(9,443)	(15,017)
Exploration | Mexico
Operating Segment Reporting
Production costs applicable to sales										(2)	(14)
Exploration | McEwen Copper
Operating Segment Reporting
Production costs applicable to sales									$ (386)	$ (700)	$ (1,698)