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BUSINESS ACQUISITION (Details) (Minera Andes, USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Jan. 24, 2012	Mar. 31, 2013
BUSINESS ACQUISITION
Exchange ratio	0.45
Exchangeable Shares received by shareholders of acquiree	127,331,498
Ratio for exchange of exchangeable shares		1
Replacement options
BUSINESS ACQUISITION
Estimated fair value of the vested portion of the replacement options		3.2

X

- Definition

Represents the exchange ratio to determine the number of shares of the acquirer that shareholders of acquiree entity will receive for each share held.

+ References

No definition available.

+ Details

Name:	mux_BusinessAcquisitionShareExchangeRatio
Namespace Prefix:	mux_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of shares of common stock into which each unit of another convertible security can be converted.

+ References

No definition available.

+ Details

Name:	mux_CommonStockConversionRatio
Namespace Prefix:	mux_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares of exchangeable stock issued during the period pursuant to acquisitions.

+ References

No definition available.

+ Details

Name:	mux_ExchangeableStockIssuedDuringPeriodSharesAcquisitions
Namespace Prefix:	mux_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration