CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	Common Shares and Additional Paid-in Capital	Accumulated Deficit	Non-controlling Interests	Total
Balance at Dec. 31, 2022	$ 1,644,145	$ (1,321,336)	$ 33,465	$ 356,274
Balance (in shares) at Dec. 31, 2022	47,428
Increase (Decrease) in Shareholders' Equity
Stock-based compensation	$ 261			261
Stock-based compensation (in shares)	21
Restricted shares issued	$ 93			93
Restricted shares issued (in shares)	43
Proceeds from McEwen Copper Inc. financing	$ 109,913		75,477	185,390
Net loss		(83,154)	(24,890)	(108,044)
Balance at Sep. 30, 2023	$ 1,754,412	(1,404,490)	84,052	433,974
Balance (in shares) at Sep. 30, 2023	47,492
Balance at Jun. 30, 2023	$ 1,754,142	(1,386,039)	93,974	462,077
Balance (in shares) at Jun. 30, 2023	47,471
Increase (Decrease) in Shareholders' Equity
Stock-based compensation	$ 177			177
Stock-based compensation (in shares)	21
Restricted shares issued	$ 93			93
Net loss		(18,451)	(9,922)	(28,373)
Balance at Sep. 30, 2023	$ 1,754,412	(1,404,490)	$ 84,052	433,974
Balance (in shares) at Sep. 30, 2023	47,492
Balance at Dec. 31, 2023	$ 1,768,456	(1,266,036)		502,420
Balance (in shares) at Dec. 31, 2023	49,440
Increase (Decrease) in Shareholders' Equity
Stock-based compensation	$ 2,142			2,142
Stock-based compensation (in shares)	113
Exercise of warrants	$ 8			8
Sale of flow-through shares (Note 12)	$ 14,374			14,374
Sale of flow-through shares (Note 12) (in shares)	1,533
Shares issued to acquire Timberline Resources Corporation (Note 12)	$ 17,706			17,706
Shares issued to acquire Timberline Resources Corporation (Note 12) (in shares)	1,839
Warrants assumed in acquisition of Timberline Resources Corporation (Note 12)	$ 913			913
Net loss		(35,459)		(35,459)
Balance at Sep. 30, 2024	$ 1,803,599	(1,301,495)		502,104
Balance (in shares) at Sep. 30, 2024	52,925
Balance at Jun. 30, 2024	$ 1,784,623	(1,299,414)		485,209
Balance (in shares) at Jun. 30, 2024	51,073
Increase (Decrease) in Shareholders' Equity
Stock-based compensation	$ 357			357
Stock-based compensation (in shares)	13
Shares issued to acquire Timberline Resources Corporation (Note 12)	$ 17,706			17,706
Shares issued to acquire Timberline Resources Corporation (Note 12) (in shares)	1,839
Warrants assumed in acquisition of Timberline Resources Corporation (Note 12)	$ 913			913
Net loss		(2,081)		(2,081)
Balance at Sep. 30, 2024	$ 1,803,599	$ (1,301,495)		$ 502,104
Balance (in shares) at Sep. 30, 2024	52,925