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INVESTMENTS (Tables) | 9 Months Ended
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Sep. 30, 2016
INVESTMENTS |
Summary of investment portfolio |
|  |  |  |  |  |  |  |  |  |  | Other |  | Statement of |  |  |  |
|  | Opening |  | Additions |  | Disposals |  | Comprehensive |  | Operations |  | Fair Value |
|  | balance |  | during |  | during |  | Income |  | (Loss) |  | end of the |
As of September 30, 2016 |  | (January 1) |  | period |  | period |  | (pre-tax) |  | Income |  | period |
Marketable equity securities |  | $ | 1,032 |  | $ | 2,172 |  | $ | (470) |  | $ | 3,314 |  | $ | (860) |  | $ | 5,188 |
Warrants |  |  | — |  |  | 346 |  |  | — |  |  | — |  |  | 1,522 |  |  | 1,868 |
Investments |  | $ | 1,032 |  | $ | 2,518 |  | $ | (470) |  | $ | 3,314 |  | $ | 662 |  | $ | 7,056 |
|  |  |  |  |  |  |  |  |  |  | Other |  | Statement of |  |  |  |
|  | Opening |  | Additions |  | Disposals |  | Comprehensive |  | Operations |  | Fair Value |
|  | balance |  | during |  | during |  | Loss |  | (Loss) |  | end of the |
As of December 31, 2015 |  | (January 1) |  | year |  | year |  | (pre-tax) |  | Income |  | year |
Marketable equity securities |  | $ | 1,409 |  | $ | 448 |  | $ | — |  | $ | (825) |  | $ | — |  | $ | 1,032 |
Warrants |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Investments |  | $ | 1,409 |  | $ | 448 |  | $ | — |  | $ | (825) |  | $ | — |  | $ | 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_
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