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OPERATING SEGMENT REPORTING - Summary of Reportable Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Segment Reporting
Revenue from gold and silver sales	$ 28,240	$ 25,988	$ 30,647	$ 25,542	$ 34,966	$ 37,129	$ 40,706	$ 23,740	$ 110,417	$ 136,541	$ 104,789
Depreciation and depletion									(19,701)	(23,798)	(22,910)
Gross profit (loss)	$ (288)	$ 1,503	$ 4,235	$ (5,994)	$ (5,897)	$ 344	$ 4,059	$ (4,986)	(544)	(6,480)	(26,948)
Advanced projects - Los Azules									(61,148)	(5,019)
Advanced projects - Other									(5,580)	(7,420)	(11,681)
Impairment loss on mineral property interests and plant and equipment (Note 8)									0	0	(83,805)
Loss from investment in Minera Santa Cruz S.A.									2,776	(7,533)	(1,517)
Other operating											(1,968)
Loss before income and mining taxes									(80,288)	(64,199)	(153,715)
Capital expenditures									26,234	36,033	13,925
United States Reportable Segment [Member]
Operating Segment Reporting
Revenue from gold and silver sales									47,926	79,205	48,884
Depreciation and depletion									(4,737)	(8,502)	(11,785)
Gross profit (loss)									(311)	(3,287)	(21,366)
Advanced projects - Other									(52)	(440)	(1,071)
Impairment loss on mineral property interests and plant and equipment (Note 8)											(83,805)
Other operating											(1,390)
Segment income (loss)									(5,191)	(9,602)	(114,409)
Capital expenditures									5,374	2,416	4,821
Canada
Operating Segment Reporting
Revenue from gold and silver sales									60,848	50,704	41,452
Depreciation and depletion									(14,964)	(15,296)	(10,883)
Gross profit (loss)									9,039	2,447	(4,070)
Advanced projects - Other									(1,206)	(2,635)	(6,088)
Other operating											(578)
Segment income (loss)									(1,610)	(15,205)	(17,186)
Capital expenditures									15,317	33,617	9,104
Mexico Reportable Segment [Member]
Operating Segment Reporting
Revenue from gold and silver sales									1,643	6,632	14,453
Depreciation and depletion											(242)
Gross profit (loss)									(9,272)	(5,640)	(1,512)
Advanced projects - Other									(4,322)	(4,345)	(4,522)
Segment income (loss)									(13,596)	(9,999)	(6,547)
Capital expenditures									2,800
MSC
Operating Segment Reporting
Loss from investment in Minera Santa Cruz S.A.									2,776	(7,533)	(1,517)
Segment income (loss)									2,776	(7,533)	(1,517)
McEwen Copper
Operating Segment Reporting
Advanced projects - Other									(61,148)	(5,019)
Segment income (loss)									(61,848)	(6,717)	(2,121)
Capital expenditures									2,743
Total Segment
Operating Segment Reporting
Revenue from gold and silver sales									110,417	136,541	104,789
Depreciation and depletion									(19,701)	(23,798)	(22,910)
Gross profit (loss)									(544)	(6,480)	(26,948)
Advanced projects - Other									(66,728)	(12,439)	(11,681)
Loss from investment in Minera Santa Cruz S.A.									2,776	(7,533)	(1,517)
Segment income (loss)									(79,469)	(49,056)	(141,780)
General and Administrative and other									(819)	(15,143)	(11,935)
Gold and silver sales
Operating Segment Reporting
Revenue from gold and silver sales									110,417	136,541	104,789
Product [Member]
Operating Segment Reporting
Production costs applicable to sales									(91,260)	(119,223)	(108,827)
Product [Member] | United States Reportable Segment [Member]
Operating Segment Reporting
Production costs applicable to sales									(43,500)	(73,990)	(58,465)
Product [Member] | Canada
Operating Segment Reporting
Production costs applicable to sales									(36,845)	(32,961)	(34,639)
Product [Member] | Mexico Reportable Segment [Member]
Operating Segment Reporting
Production costs applicable to sales									(10,915)	(12,272)	(15,723)
Product [Member] | Total Segment
Operating Segment Reporting
Production costs applicable to sales									(91,260)	(119,223)	(108,827)
Exploration | United States Reportable Segment [Member]
Operating Segment Reporting
Production costs applicable to sales									(4,828)	(5,875)	(6,777)
Exploration | Canada
Operating Segment Reporting
Production costs applicable to sales									(9,443)	(15,017)	(6,450)
Exploration | Mexico Reportable Segment [Member]
Operating Segment Reporting
Production costs applicable to sales									(2)	(14)	(513)
Exploration | McEwen Copper
Operating Segment Reporting
Production costs applicable to sales									(700)	(1,698)	(2,121)
Exploration | Total Segment
Operating Segment Reporting
Production costs applicable to sales									$ (14,973)	$ (22,604)	$ (15,861)

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