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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) | 12 Months Ended
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Dec. 31, 2015
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
Leasehold Improvements |
Property and Equipment |
Estimated economic life | 10 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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- Details
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Balance Type: |
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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mux_TrailersHeavyVehiclesAndOtherSiteEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |