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NATURE OF OPERATIONS AND RECENT ACCOUNTING PRONOUNCEMENTS (Details) | 6 Months Ended
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Jun. 30, 2020
Ownership interest (as a percent) | 49.00%
Subsidiary (as a percent) | 100.00%
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Ownership interest (as a percent) | 49.00%

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- Definition A subsidiary of the Company. + References No definition available. + Details
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Namespace Prefix: | mux_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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