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COMMITMENTS AND CONTINGENCIES - Flow-through eligible expenses (Details) - USD ($) $ in Millions	Jun. 14, 2024	Dec. 14, 2023	Jun. 30, 2024
Flow through Eligible Expenses | Timmins
Other Commitments
Gross proceeds	$ 21.9	$ 16.1
Flow Through CEE
Other Commitments
Renounced commitment			$ 8.1

X

- Definition

Amount of commitment renounced.

+ References

No definition available.

+ Details

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Namespace Prefix:	mux_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	mux_MineralPropertyNameAxis=mux_TimminsPropertyInCanadaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=mux_FlowThroughEligibleCanadianExplorationExpendituresMember
Namespace Prefix:
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Balance Type:
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