XML 31 R49.htm IDEA: XBRL DOCUMENT
v3.20.1

NATURE OF OPERATIONS (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019
Ownership interest (as a percent) | 49.00%
Subsidiary (as a percent) | 100.00%
MSC |
Ownership interest (as a percent) | 49.00%

X
- Definition A subsidiary of the Company. + References No definition available. + Details
Name: | mux_SubsidiaryPercentage
Namespace Prefix: | mux_
Data Type: | num:percentItemType
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&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: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=mux_MineraSantaCruzSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |