OPERATING SEGMENT REPORTING - Summary of Reportable Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating Segment Reporting
Revenue from gold and silver sales	$ 52,250	$ 38,404	$ 140,954	$ 107,551
Production costs applicable to sales	(29,682)	(26,468)	(86,858)	(80,043)
Depreciation and depletion	(8,765)	(8,181)	(23,524)	(23,370)
Gross profit (loss)	13,803	3,755	30,572	4,138
Advanced projects	(2,468)	(20,444)	(7,912)	(83,191)
Exploration	(5,329)	(4,674)	(14,184)	(16,426)
Income (loss) from equity method investments	(3,080)	(2,672)	(31,929)	(7,047)
Segment profit (loss)	2,926	(24,035)	(23,453)	(102,526)
General and administrative	(2,138)	(3,720)	(10,672)	(9,211)
Other expense	(2,055)	(862)	(5,453)
Other income				(864)
Loss before income and mining taxes	(1,267)	(28,617)	(39,578)	(110,873)
Capital expenditures	19,140	10,063	30,346	21,987
USA
Operating Segment Reporting
Revenue from gold and silver sales	33,251	17,967	88,215	45,526
Production costs applicable to sales	(17,078)	(14,399)	(49,515)	(41,446)
Depreciation and depletion	(4,235)	(2,647)	(10,705)	(7,170)
Gross profit (loss)	11,938	921	27,995	(3,090)
Exploration	(3,474)	(1,813)	(7,102)	(4,133)
Segment profit (loss)	8,464	(892)	20,893	(7,223)
Capital expenditures	11,307	5,211	12,756	11,437
Canada
Operating Segment Reporting
Revenue from gold and silver sales	18,999	20,259	51,539	61,847
Production costs applicable to sales	(12,604)	(12,069)	(37,343)	(38,597)
Depreciation and depletion	(4,530)	(5,534)	(12,819)	(16,200)
Gross profit (loss)	1,865	2,656	1,377	7,050
Exploration	(1,855)	(2,861)	(7,082)	(11,907)
Segment profit (loss)	10	(205)	(5,705)	(4,857)
Capital expenditures	7,343	2,574	15,547	6,757
Mexico
Operating Segment Reporting
Revenue from gold and silver sales		178	1,200	178
Gross profit (loss)		178	1,200	178
Advanced projects	(2,468)	(1,966)	(7,912)	(4,308)
Segment profit (loss)	(2,468)	(1,788)	(6,712)	(4,130)
Capital expenditures	490	705	2,043	705
MSC
Operating Segment Reporting
Income (loss) from equity method investments	(1,228)	(2,672)	4,751	(7,047)
Segment profit (loss)	(1,228)	(2,672)	4,751	(7,047)
McEwen Copper
Operating Segment Reporting
Advanced projects		(18,478)		(78,883)
Exploration				(386)
Income (loss) from equity method investments	(1,852)		(36,680)
Segment profit (loss)	$ (1,852)	(18,478)	$ (36,680)	(79,269)
Capital expenditures		$ 1,573		$ 3,088