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DEBT (Tables) | 6 Months Ended
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Jun. 30, 2020
DEBT |
Schedule of Movements In Debt | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Six months ending June 30, 2020 |  | Year ending December 31, 2019 | ​
Balance, beginning of period | ​ | $ | 49,516 | ​ | $ | 49,206 | ​
Interest expense | ​ |  | 2,598 | ​ |  | 5,185 | ​
Interest payments | ​ |  | (2,431) | ​ |  | (4,875) | ​
Debt amendment fee | ​ | ​ | (1,875) | ​ | ​ | — | ​
Balance, end of period | ​ | $ | 47,808 | ​ | $ | 49,516 | ​
Less current portion | ​ | ​ | — | ​ | ​ | 10,000 | ​
Long-term portion | ​ | $ | 47,808 | ​ | $ | 39,516 | ​

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- Definition Tabular disclosure of movements in debt. + 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration