OPERATING SEGMENT REPORTING - Summary of Reportable Operating Segments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Segment Reporting
Revenue from gold and silver sales	$ 34,395,000	$ 30,647,000	$ 69,147,000	$ 56,189,000
Depreciation and depletion	(8,293,000)	(3,469,000)	(15,189,000)	(7,181,000)
Gross profit	(3,468,000)	4,235,000	975,000	(1,759,000)
Advanced projects	(29,799,000)	(14,922,000)	(63,359,000)	(26,057,000)
Impairment loss on mineral property interests and plant and equipment (Note 8)			0
Income (Loss) from investment in Minera Santa Cruz S.A.	(914,000)	2,511,000	(4,375,000)	1,391,000
Segment loss	(40,033,000)	(12,469,000)	(78,511,000)	(33,928,000)
General and Administrative and other	(5,277,000)	63,000	(3,745,000)	(357,000)
Loss before income and mining taxes	(45,310,000)	(12,406,000)	(82,256,000)	(34,285,000)
Capital expenditures	5,206,000	4,377,000	11,924,000	8,434,000
USA
Operating Segment Reporting
Depreciation and depletion	(3,263,000)	(943,000)	(4,523,000)	(1,760,000)
Gross profit	(4,407,000)	748,000	(3,419,000)	(2,498,000)
Advanced projects	(303,000)	(3,000)	(592,000)	(49,000)
Segment loss	(6,255,000)	(499,000)	(6,331,000)	(5,242,000)
Capital expenditures	3,235,000	219,000	6,226,000	496,000
Canada
Operating Segment Reporting
Depreciation and depletion	(5,030,000)	(2,526,000)	(10,666,000)	(5,421,000)
Gross profit	939,000	6,460,000	4,394,000	7,813,000
Advanced projects		(105,000)		(195,000)
Segment loss	(3,368,000)	3,734,000	(4,652,000)	3,297,000
Capital expenditures	1,410,000	4,008,000	4,183,000	7,554,000
Mexico
Operating Segment Reporting
Gross profit		(2,973,000)		(7,074,000)
Advanced projects	(972,000)	(733,000)	(2,362,000)	(1,976,000)
Segment loss	(972,000)	(3,706,000)	(2,362,000)	(9,050,000)
MSC
Operating Segment Reporting
Income (Loss) from investment in Minera Santa Cruz S.A.	(914,000)	2,511,000	(4,375,000)	1,391,000
Segment loss	(914,000)	2,511,000	(4,375,000)	1,391,000
McEwen Copper
Operating Segment Reporting
Advanced projects	(28,524,000)	(14,081,000)	(60,405,000)	(23,837,000)
Segment loss	(28,524,000)	(14,509,000)	(60,791,000)	(24,324,000)
Capital expenditures	561,000	150,000	1,515,000	384,000
Gold and silver sales
Operating Segment Reporting
Revenue from gold and silver sales	34,395,000	30,647,000	69,147,000	56,189,000
Gold and silver sales | USA
Operating Segment Reporting
Revenue from gold and silver sales	15,971,000	9,996,000	27,559,000	21,739,000
Gold and silver sales | Canada
Operating Segment Reporting
Revenue from gold and silver sales	18,424,000	20,246,000	41,588,000	33,141,000
Gold and silver sales | Mexico
Operating Segment Reporting
Revenue from gold and silver sales		405,000		1,309,000
Product
Operating Segment Reporting
Production costs applicable to sales	(29,570,000)	(22,943,000)	(52,983,000)	(50,767,000)
Product | USA
Operating Segment Reporting
Production costs applicable to sales	(17,115,000)	(8,305,000)	(26,455,000)	(22,477,000)
Product | Canada
Operating Segment Reporting
Production costs applicable to sales	(12,455,000)	(11,260,000)	(26,528,000)	(19,907,000)
Product | Mexico
Operating Segment Reporting
Production costs applicable to sales		(3,378,000)		(8,383,000)
Exploration
Operating Segment Reporting
Production costs applicable to sales	(5,852,000)	(4,293,000)	(11,752,000)	(7,503,000)
Exploration | USA
Operating Segment Reporting
Production costs applicable to sales	(1,545,000)	(1,244,000)	(2,320,000)	(2,695,000)
Exploration | Canada
Operating Segment Reporting
Production costs applicable to sales	$ (4,307,000)	(2,621,000)	(9,046,000)	(4,321,000)
Exploration | McEwen Copper
Operating Segment Reporting
Production costs applicable to sales		$ (428,000)	$ (386,000)	$ (487,000)