XML 73 R45.htm IDEA: XBRL DOCUMENT
v3.6.0.2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stockpiles, Proven and Probable Reserves (Details) | 12 Months Ended
--- | ---
Dec. 31, 2016
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
San Jose mine |
Stockpiles, Ore on Leach Pads, In-process Inventory, Precious Metals Inventory and Materials and Supplies: |
Ownership interest (as a percent) | 49.00%

X
- 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

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=mux_SanJoseSilverGoldMineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |