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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
COMMITMENTS AND CONTINGENCIES.
Outstanding surety bonds	$ 4.8mux_OutstandingSuretyBonds	$ 4.8mux_OutstandingSuretyBonds
Percentage of annual fees on surety bonds	1.50%mux_SuretyBondsAnnualFeesPercentage
Percentage of upfront deposit on surety bonds	10.00%mux_SuretyBondsUpfrontDepositPercentage
Surety bonds upfront deposit amount	$ 0.5mux_SuretyBondsUpfrontDepositAmount

X

- Definition

The value of the outstanding surety bonds.

+ References

No definition available.

+ Details

Name:	mux_OutstandingSuretyBonds
Namespace Prefix:	mux_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the percentage of annual fees on the value of the surety bonds.

+ References

No definition available.

+ Details

Name:	mux_SuretyBondsAnnualFeesPercentage
Namespace Prefix:	mux_
Data Type:	num:percentItemType
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

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration