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THE COMPANY (Details 2) (El Gallo Complex)	12 Months Ended
	Dec. 31, 2012 oz
Gold
Company
Quantity produced (in ounces)	6,863
Silver
Company
Quantity produced (in ounces)	4,492

X

- Definition

Represents the quantity of physical commodities produced by the entity during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	mux_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

X

- Details

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