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RELATED PARTY TRANSACTIONS (Details) (USD $)	3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2012 Lexam L.P.	Sep. 30, 2012 Lexam L.P.	Sep. 30, 2011 Lexam L.P.	Sep. 30, 2012 Mr. McEwen	Sep. 30, 2011 208	Sep. 30, 2011 208
RELATED PARTY TRANSACTIONS
Amount of expenses incurred and paid	$ 14,809	$ 218,528	$ 60,477		$ 18,134	$ 73,628
Minimum percentage interest of voting securities beneficially owned by related party				5.00%

X

- Definition

Represents the minimum percentage of voting interest in the entity, beneficially owned by the related party.

+ References

No definition available.

+ Details

Name:	mux_RelatedPartyTransactionMinimumPercentageOfVotingInterestOwnedByRelatedParty
Namespace Prefix:	mux_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Definition

Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

+ References

No definition available.

+ Details

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