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OPERATING SEGMENT REPORTING - Summary of Reportable Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating Segment Reporting
Revenue	$ 38,404	$ 25,988	$ 107,551	$ 82,177
Depreciation and depletion	(8,181)	(4,313)	(23,370)	(11,494)
Gross profit (loss)	3,755	1,503	4,138	(256)
Advanced projects		(8,817)		(34,874)
Income (Loss) from investment in Minera Santa Cruz S.A.	(2,672)	758	(7,047)	2,149
Segment income (loss)	(2,672)	(10,485)		(44,413)
General and Administrative and other		(581)		(938)
Loss before income and mining taxes	(28,617)	(11,066)	(110,873)	(45,351)
Capital expenditures		8,078		16,512
USA
Operating Segment Reporting
Depreciation and depletion	(2,647)	(1,514)	(7,170)	(3,275)
Gross profit (loss)	921	(1,275)	(3,090)	(3,775)
Advanced projects		(4)		(52)
Segment income (loss)	(892)	(2,334)	(7,223)	(7,574)
Capital expenditures	5,211	1,012	11,437	1,508
Canada
Operating Segment Reporting
Depreciation and depletion		(2,799)		(8,219)
Gross profit (loss)		4,063		11,878
Advanced projects		(30)		(227)
Segment income (loss)		1,300		4,595
Capital expenditures		4,080		11,633
Mexico
Operating Segment Reporting
Depreciation and depletion			(16,200)
Gross profit (loss)		(1,285)	7,050	(8,359)
Advanced projects		(1,160)		(3,135)
Segment income (loss)		(2,445)	(4,857)	(11,494)
Capital expenditures		2,827	6,757	2,827
MSC
Operating Segment Reporting
Income (Loss) from investment in Minera Santa Cruz S.A.		758		2,149
Segment income (loss)		758		2,149
McEwen Copper
Operating Segment Reporting
Advanced projects		(7,623)		(31,460)
Segment income (loss)		(7,764)		(32,089)
Capital expenditures		159		544
Gold and silver sales
Operating Segment Reporting
Revenue	38,404	25,988	107,551	82,177
Gold and silver sales | USA
Operating Segment Reporting
Revenue	17,967	12,596	45,526	34,334
Gold and silver sales | Canada
Operating Segment Reporting
Revenue		13,058		46,200
Gold and silver sales | Mexico
Operating Segment Reporting
Revenue		334	61,847	1,643
Production costs applicable to sales
Operating Segment Reporting
Production costs applicable to sales		(20,172)		(70,939)
Production costs applicable to sales | USA
Operating Segment Reporting
Production costs applicable to sales	(14,399)	(12,357)	(41,446)	(34,834)
Production costs applicable to sales | Canada
Operating Segment Reporting
Production costs applicable to sales		(6,196)		(26,103)
Production costs applicable to sales | Mexico
Operating Segment Reporting
Production costs applicable to sales		(1,619)	(38,597)	(10,002)
Exploration
Operating Segment Reporting
Production costs applicable to sales		(3,929)		(11,432)
Exploration | USA
Operating Segment Reporting
Production costs applicable to sales	$ (1,813)	(1,055)	(4,133)	(3,747)
Exploration | Canada
Operating Segment Reporting
Production costs applicable to sales		(2,733)		(7,056)
Exploration | Mexico
Operating Segment Reporting
Production costs applicable to sales			$ (11,907)
Exploration | McEwen Copper
Operating Segment Reporting
Production costs applicable to sales		$ (141)		$ (629)

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