INCOME AND MINING TAXES - Reconciliation of Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
INCOME AND MINING TAXES.
(Loss) income before income and mining taxes	$ (46,739)	$ 67,036	$ (80,288)
Statutory tax rate (as a percent)	21.00%	21.00%	21.00%
US Federal and State tax (recovery) expense at statutory rate	$ (9,815)	$ 14,078	$ (16,860)
Reconciling items:
Equity loss (income) from investments	10,555	15,310	(583)
Deconsolidation of McEwen Copper Inc.		(46,644)
Disposal of McEwen Copper Inc.'s shares	(1,531)	6,179
Deferred tax liability on investment in associate		38,340
Realized flow-through expenditures	4,017	3,570	2,169
Realized flow-through premium	(2,304)	(3,423)	(2,011)
Withholding tax	426	632
Adjustment for foreign tax rates	(3,746)	(13,769)	(8,384)
Permanent differences	(2,014)	9,909	9,353
Foreign exchange on translation of books	(4,157)	42	4,308
Losses expired	3,330	8,282	1,876
Proceeds received from sale of NSR			8,072
Adjustments in relation to prior years	367	(629)	7,760
Current and deferred mining tax liabilities	2,283	1,455	116
Movement in valuation allowance	(505)	821	(10)
Other	46	(294)
Income and mining tax (recovery) expense	$ (3,048)	$ 33,859	$ 5,806