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ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Reclamation obligations
Reclamation Adjustment	$ 1.1
Black Fox
Reclamation obligations
Reclamation Adjustment	5.3
Gold Bar mine
Reclamation obligations
Reclamation Adjustment	$ 4.2	$ 3.6

X

- Definition

Amount of reclamation adjustments 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

- 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

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

X

- Details

Name:	mux_MineralPropertyNameAxis=mux_GoldBarMineMember
Namespace Prefix:
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Balance Type:
Period Type: