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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3)	6 Months Ended
	Jun. 30, 2012 item
Impairment of Long-Lived Assets
Number of regions into which properties has been separated	2
Office furniture, equipment and light vehicles | Minimum
Property and Equipment
Estimated economic life	3 years
Office furniture, equipment and light vehicles | Maximum
Property and Equipment
Estimated economic life	5 years
Trailers, heavy vehicles and other site equipment | Minimum
Property and Equipment
Estimated economic life	5 years
Trailers, heavy vehicles and other site equipment | Maximum
Property and Equipment
Estimated economic life	15 years
Building
Property and Equipment
Estimated economic life	20 years

X

- Definition

Represents the number of regions into which the entity has separated its properties, due to their physical separation, for the purposes of impairment testing.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration