OPERATING SEGMENT REPORTING - Summary of Reportable Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Operating Segment Reporting
Revenue	$ 47,476	$ 34,395	$ 88,704	$ 69,147
Depreciation and depletion	(4,652)	(8,293)	(14,759)	(15,189)
Gross profit (loss)	10,758	(3,468)	16,769	975
Exploration	(4,984)	(5,852)	(8,855)	(11,752)
Advanced projects	(2,990)	(29,799)	(5,444)	(63,359)
Income (loss) from equity method investments	(12,115)	(914)	(28,849)	(4,375)
Segment profit (loss)	(9,331)	(40,033)	(26,379)	(78,511)
General and administrative	(4,461)	(2,050)	(8,534)	(5,491)
Other expense	(1,579)	(3,227)	(3,398)
Other income				(1,746)
Loss before income and mining taxes	(15,371)	(45,310)	(38,311)	(82,256)
Capital expenditures	6,684	5,206	11,206	11,924
USA
Operating Segment Reporting
Depreciation and depletion	(434)	(3,263)	(6,470)	(4,523)
Gross profit (loss)	10,082	(4,407)	16,057	(3,419)
Exploration	(2,547)	(1,545)	(3,628)	(2,320)
Advanced projects		(303)		(592)
Segment profit (loss)	7,535	(6,255)	12,429	(6,331)
Capital expenditures	520	3,235	1,449	6,226
Canada
Operating Segment Reporting
Depreciation and depletion	(4,218)	(5,030)	(8,289)	(10,666)
Gross profit (loss)	676	939	(488)	4,394
Exploration	(2,437)	(4,307)	(5,227)	(9,046)
Segment profit (loss)	(1,761)	(3,368)	(5,715)	(4,652)
Capital expenditures	5,424	1,410	8,204	4,183
Mexico
Operating Segment Reporting
Gross profit (loss)			1,200
Advanced projects	(2,990)	(972)	(5,444)	(2,362)
Segment profit (loss)	(2,990)	(972)	(4,244)	(2,362)
Capital expenditures	740		1,553
MSC
Operating Segment Reporting
Income (loss) from equity method investments	4,701	(914)	5,979	(4,375)
Segment profit (loss)	4,701	(914)	5,979	(4,375)
McEwen Copper
Operating Segment Reporting
Exploration				(386)
Advanced projects		(28,524)		(60,405)
Income (loss) from equity method investments	(16,816)		(34,828)
Segment profit (loss)	(16,816)	(28,524)	(34,828)	(60,791)
Capital expenditures		561		1,515
Gold and silver sales
Operating Segment Reporting
Revenue	47,476	34,395	88,704	69,147
Gold and silver sales | USA
Operating Segment Reporting
Revenue	29,686	15,971	54,964	27,559
Gold and silver sales | Canada
Operating Segment Reporting
Revenue	17,790	18,424	32,540	41,588
Gold and silver sales | Mexico
Operating Segment Reporting
Revenue			1,200
Production costs applicable to sales
Operating Segment Reporting
Production costs applicable to sales	(32,066)	(29,570)	(57,176)	(52,983)
Production costs applicable to sales | USA
Operating Segment Reporting
Production costs applicable to sales	(19,170)	(17,115)	(32,437)	(26,455)
Production costs applicable to sales | Canada
Operating Segment Reporting
Production costs applicable to sales	$ (12,896)	$ (12,455)	$ (24,739)	$ (26,528)