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INVESTMENTS (Tables) | 3 Months Ended
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Mar. 31, 2018
INVESTMENTS |
Summary of investment portfolio |
|  |  |  |  |  |  |  |  |  |  | Other |  | Statement of |  |  |
|  | Opening |  | Additions |  | Disposals |  | Comprehensive |  | Operations |  | Fair Value
|  | balance |  | during |  | during |  | Income (Loss) |  | (Loss) |  | end of the
As of March 31, 2018 |  | (January 1) |  | period |  | period |  | (pre-tax) |  | Income |  | period
Marketable equity securities |  | $ | 6,404 |  | $ | — |  | $ | (3,397) |  | $ | — |  | $ | (1,137) |  | $ | 1,870
Warrants |  |  | 1,567 |  |  | — |  |  | — |  |  | — |  |  | (864) |  |  | 703
Investments |  | $ | 7,971 |  | $ | — |  | $ | (3,397) |  | $ | — |  | $ | (2,001) |  | $ | 2,573
|  |  |  |  |  |  |  |  |  |  | Other |  | Statement of |  |  |
|  | Opening |  | Additions |  | Disposals |  | Comprehensive |  | Operations |  | Fair Value
|  | balance |  | during |  | during |  | Income (Loss) |  | (Loss) |  | end of the
As of December 31, 2017 |  | (January 1) |  | year |  | year |  | (pre-tax) |  | Income |  | year
Marketable equity securities |  | $ | 6,749 |  | $ | — |  | $ | (2,163) |  | $ | 1,334 |  | $ | 484 |  | $ | 6,404
Warrants |  |  | 1,794 |  |  | — |  |  | — |  |  | — |  |  | (227) |  |  | 1,567
Investments |  | $ | 8,543 |  | $ | — |  | $ | (2,163) |  | $ | 1,334 |  | $ | 257 |  | $ | 7,971

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- Definition A tabular disclosure of the investment portfolio, which consists of the marketable securities and warrants. + References No definition available. + Details
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Namespace Prefix: | mux_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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