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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) | 9 Months Ended
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Sep. 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

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- 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

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

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

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- 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