INCOME AND MINING TAXES - Deferred Income Tax Recovery (Expense) and Net Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current tax (expense)/recovery
United States	$ 971
Foreign	(4,107)	$ 7,663
Current tax expense	(3,136)	7,663
Deferred income tax (expense)/recovery
United States			$ (387)
Foreign	36,995	(1,856)	(6,928)
Deferred tax recovery	36,995	(1,856)	(7,315)
Mining Tax Expense Recovery
United States	971		(387)
Foreign	32,888	5,806	(6,928)
Total income and mining tax expense/(recovery)	33,859	5,806	(7,315)
Net income (loss) before tax:
United States	(7,702)	(20,618)	(24,808)
Foreign	74,738	(59,670)	(39,391)
Income (loss) before income and mining taxes	$ 67,036	$ (80,288)	$ (64,199)

No definition available.

Name:	mux_MiningTaxExpenseRecoveryAbstract
Namespace Prefix:	mux_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The Amount of income and mining current foreign tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, current national tax expense (benefit) for non-US (United States of America) jurisdiction.

+ References

No definition available.