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INVESTMENTS (Tables) | 6 Months Ended
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Jun. 30, 2019
Summary of investment portfolio | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at | ​ | Additions | ​ | Net gain | ​ | Disposals | ​ | Unrealized | ​ | Fair value
​ | ​ | December 31, | ​ | during | ​ | (loss) on | ​ | during | ​ | gain (loss) on | ​ | June 30,
​ |  | 2018 |  | period |  | securities sold |  | period |  | securities held |  | 2019
Marketable equity securities | ​ | $ | 2,718 | ​ | $ | 264 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,372 | ​ | $ | 4,354
Warrants | ​ |  | 413 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 380 | ​ |  | 793
Investments | ​ | $ | 3,131 | ​ | $ | 264 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,752 | ​ | $ | 5,147
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at | ​ | Additions | ​ | Net gain | ​ | Disposals | ​ | Unrealized | ​ | Fair value
​ | ​ | December 31, | ​ | during | ​ | (loss) on | ​ | during | ​ | gain (loss) on | ​ | June 30,
​ |  | 2017 |  | period |  | securities sold |  | period |  | securities held |  | 2018
Marketable equity securities | ​ | $ | 6,404 | ​ | $ | 1,211 | ​ | $ | (767) | ​ | $ | (2,899) | ​ | $ | (1,637) | ​ | $ | 2,312
Warrants | ​ |  | 1,567 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (702) | ​ | ​ | (865) | ​ | ​ | —
Investments | ​ | $ | 7,971 | ​ | $ | 1,211 | ​ | $ | (767) | ​ | $ | (3,601) | ​ | $ | (2,502) | ​ | $ | 2,312

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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
Name: | mux_ScheduleOfMarketableEquitySecuritiesAndWarrantsTableTextBlock
Namespace Prefix: | mux_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration