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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 16 Months Ended | 28 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2014
El Gallo mine |  |  |
Stockpiles, Material on Leach Pads, In-process Inventory, Precious Metals Inventory and Materials and Supplies |  |  |
Cumulative metallurgical recovery rate for gold production (as a percent) | 61.00%mux_PercentageOfCumulativeMetallurgicalRecoveryForGoldProduction / mux_MineralPropertyNameAxis = mux_ElGalloComplexMember | 56.00%mux_PercentageOfCumulativeMetallurgicalRecoveryForGoldProduction / mux_MineralPropertyNameAxis = mux_ElGalloComplexMember |
Minimum |  |  |
Stockpiles, Material on Leach Pads, In-process Inventory, Precious Metals Inventory and Materials and Supplies |  |  |
Recovery percentage of leach pads of the recoverable ounces in the first year of leaching |  |  | 50.00%mux_OreOnLeachPadsRecoveryPercentageOfRecoverableOuncesInFirstYearOfLeaching / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum |  |  |
Stockpiles, Material on Leach Pads, In-process Inventory, Precious Metals Inventory and Materials and Supplies |  |  |
Recovery percentage of leach pads of the recoverable ounces in the first year of leaching |  |  | 95.00%mux_OreOnLeachPadsRecoveryPercentageOfRecoverableOuncesInFirstYearOfLeaching / us-gaap_RangeAxis = us-gaap_MaximumMember

X
- Definition Represents the typical recovery percentage of recoverable ounces of leach pad operations in the first years of production. + References No definition available. + Details
Name: | mux_OreOnLeachPadsRecoveryPercentageOfRecoverableOuncesInFirstYearOfLeaching
Namespace Prefix: | mux_
Data Type: | num:percentItemType
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- Details
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Namespace Prefix: | mux_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the cumulative, life-of-mine recovery percentage of recoverable ounces for the Company leach pad operation. + References No definition available. + Details
Name: | mux_PercentageOfCumulativeMetallurgicalRecoveryForGoldProduction
Namespace Prefix: | mux_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |