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INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2016
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 December 31, 2016 |  | (January 1) |  | year |  | year |  | (pre-tax) |  | Income |  | year
Marketable equity securities |  | $ | 1,032 |  | $ | 4,004 |  | $ | (470) |  | $ | 3,043 |  | $ | (860) |  | $ | 6,749
Warrants |  |  | — |  |  | 415 |  |  | — |  |  | — |  |  | 1,379 |  |  | 1,794
Investments |  | $ | 1,032 |  | $ | 4,419 |  | $ | (470) |  | $ | 3,043 |  | $ | 519 |  | $ | 8,543
|  |  |  |  |  |  |  |  |  |  | Other |  | Statement of |  |  |
|  | Opening |  | Additions |  | Disposals |  | Comprehensive |  | Operations |  | Fair Value
|  | balance |  | during |  | during |  | Income (Loss) |  | (Loss) |  | end of the
As of December 31, 2015 |  | (January 1) |  | period |  | period |  | (pre-tax) |  | Income |  | period
Marketable equity securities |  | $ | 1,082 |  | $ | 1,114 |  | $ | — |  | $ | (1,164) |  | $ | — |  | $ | 1,032
Warrants |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
Investments |  | $ | 1,082 |  | $ | 1,114 |  | $ | — |  | $ | (1,164) |  | $ | — |  | $ | 1,032

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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_
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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