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RELATED PARTY TRANSACTIONS (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Lexam L.P.
RELATED PARTY TRANSACTIONS
Amount of expenses incurred and paid	$ 163,826	$ 11,834	$ 203,718	$ 60,477
Mr. McEwen
RELATED PARTY TRANSACTIONS
Minimum percentage interest of voting securities beneficially owned by related party	5.00%		5.00%
208
RELATED PARTY TRANSACTIONS
Amount of expenses incurred and paid		$ 30,930		$ 55,050

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	mux_
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X

- Details

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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