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OTHER INCOME (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) project	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
OTHER INCOME
COVID-19 Relief	$ 1,725	$ 2,691	$ 2,836	$ 2,691
Other income	$ 2,264	$ 14	$ 2,274	$ 41
Number of projects sold | project	2

X

- Definition

The number of projects sold.

+ References

No definition available.

+ Details

Name:	mux_NumberOfProjectsSold
Namespace Prefix:	mux_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of unusual or infrequent item arising out of COVID relief.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of income related to nonoperating activities, classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(d))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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