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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	16 Months Ended	12 Months Ended
	Dec. 31, 2013 El Gallo mine	Dec. 31, 2013 Minimum	Dec. 31, 2013 Maximum
Stockpiles, Material on Leach Pads, In-process Inventory, Precious Metals Inventory and Materials and Supplies
Recovery percentage of leach pads of the recoverable ounces in the first year of leaching		50.00%	95.00%
Cumulative metallurgical recovery rate for gold production (as a percent)	61.00%

X

- Definition

Represents the typical recovery percentage of recoverable ounces of leach pad operations in the first years of production.

+ References

No definition available.

+ Details

Name:	mux_OreOnLeachPadsRecoveryPercentageOfRecoverableOuncesInFirstYearOfLeaching
Namespace Prefix:	mux_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	mux_OreStockpileInventoryLineItems
Namespace Prefix:	mux_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the cumulative, life-of-mine recovery percentage of recoverable ounces for the Company leach pad operation.

+ References

No definition available.

+ Details

Name:	mux_PercentageOfCumulativeMetallurgicalRecoveryForGoldProduction
Namespace Prefix:	mux_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration