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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract] |  |
Cash bonding for mineral properties in the United States | $ 2,000 | $ 5,183,000
Percentage of annual fees on surety bonds | 1.50% |
Percentage of upfront deposit on surety bonds | 10.00% |
Surety bonds upfront deposit amount | $ 500,000 |

X
- Definition Represents the percentage of annual fees on the value of the surety bonds. + References No definition available. + Details
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Namespace Prefix: | mux_
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Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of upfront deposit on the value of surety bonds. + References No definition available. + Details
Name: | mux_SuretyBondsUpfrontDepositAmount
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the percentage of upfront deposit on the value of the surety bonds. + References No definition available. + Details
Name: | mux_SuretyBondsUpfrontDepositPercentage
Namespace Prefix: | mux_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Balance Type: | na
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X
- Definition The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal. + References No definition available. + Details
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