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COMMITMENTS AND CONTINGENCIES - Flow-through eligible expenses (Details) $ in Millions	Jun. 14, 2024 USD ($)
COMMITMENTS AND CONTINGENCIES
Gross proceeds	$ 21.8

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- Definition

Gross equity impact of the value of new stock issued during the period.

+ References

No definition available.

+ Details

Name:	mux_StockIssuedDuringPeriodValueNewIssuesGross
Namespace Prefix:	mux_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration