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v3.21.2

OTHER INCOME (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) project | Sep. 30, 2020 USD ($)
OTHER INCOME |  |  |  |
COVID-19 relief | $ 611 | $ 2,628 | $ 3,447 | $ 5,319
Other income |  |  | $ 2,300 |
Number of projects sold | project |  |  | 2 |

X
- Definition The number of projects sold. + References No definition available. + Details
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Namespace Prefix: | mux_
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X
- Definition The amount of unusual or infrequent item arising out of COVID relief. + References No definition available. + Details
Name: | mux_UnusualOrInfrequentItemRelief
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of income related to nonoperating activities, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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