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COMMITMENTS AND CONTINGENCIES - Rental Expense and Surety Bonds (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
COMMITMENTS AND CONTINGENCIES |  |  |
Rental expense | $ 0.4 | $ 0.5 | $ 0.5
Outstanding surety bonds | $ 4.8 | $ 4.8 |
Percentage of annual fees on surety bonds | 1.50% |  |
Percentage of upfront deposit on surety bonds | 10.00% |  |
Surety bonds upfront deposit amount | $ 0.5 |  |

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- Definition The value of the outstanding surety bonds. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- 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_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- 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

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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