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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stockpiles, Proven and Probable Reserves (Details) | 12 Months Ended
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Dec. 31, 2018
Stockpiles, Ore on Leach Pads, In-process Inventory, Precious Metals Inventory and Materials and Supplies: |
Period for determining current portion of stockpiles, ore on leach pad, in-process inventory and materials and supplies | 12 months
Period within which Stockpiles, ore on leach pads, in-process inventory and materials and supplies are not expected to be processed, classified as long-term | 12 months

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- References No definition available. + Details
Name: | mux_OreStockpileInventoryAbstract
Namespace Prefix: | mux_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period within which ore stockpile inventories are not expected to be processed and classified as long-term. + References No definition available. + Details
Name: | mux_PeriodForClassifyingOreStockpileInventoryAsLongTerm
Namespace Prefix: | mux_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period for determining the current portion of the ore stockpile inventory. + References No definition available. + Details
Name: | mux_PeriodForDeterminingCurrentPortionOfOreStockpileInventory
Namespace Prefix: | mux_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration