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MARKETABLE SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2024
MARKETABLE SECURITIES |
Summary of marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at | ​ | Additions/ | ​ | Disposals/ | ​ | Unrealized | ​ | ​ | As at
​ | ​ | December 31, | ​ | transfers during | ​ | transfers during | ​ | (loss) gain on | ​ | ​ | December 31,
​ | ​ | 2023 | ​ | year | ​ | year | ​ | securities held | ​ | ​ | 2024
Marketable securities | ​ | $ | 1,743 | ​ | $ | 243 | ​ | $ | (778) | ​ | $ | (2) | ​ | $ | 1,206
Warrants | ​ | ​ | — | ​ | ​ | 123 | ​ | ​ | — | ​ | ​ | 288 | ​ | ​ | 411
Total marketable securities | ​ | $ | 1,743 | ​ | $ | 366 | ​ | $ | (778) | ​ | $ | 286 | ​ | $ | 1,617
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at | ​ | Additions/ | ​ | Disposals/ | ​ | Unrealized | ​ | McEwen | ​ | As at
​ | ​ | December 31, | ​ | transfers during | ​ | transfers during | ​ | gain on | ​ | Copper | ​ | December 31,
​ | ​ | 2022 |  | year |  | year |  | securities held |  | deconsolidation |  | 2023
Marketable securities | ​ | $ | 1,133 | ​ | $ | 34,157 | ​ | $ | — | ​ | $ | 10,684 | ​ | $ | (44,231) | ​ | $ | 1,743
Warrants | ​ |  | 162 | ​ | ​ | — | ​ | ​ | (162) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total marketable securities | ​ | $ | 1,295 | ​ | $ | 34,157 | ​ | $ | (162) | ​ | $ | 10,684 | ​ | $ | (44,231) | ​ | $ | 1,743
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at | ​ | Additions/ | ​ | Disposals/ | ​ | Unrealized | ​ | As at
​ | ​ | December 31, | ​ | transfers during | ​ | transfers during | ​ | loss on | ​ | December 31,
​ | ​ | 2021 | ​ | year | ​ | year | ​ | securities held | ​ | 2022
Marketable equity securities | ​ | $ | 1,644 | ​ | $ | — | ​ | $ | — | ​ | $ | (511) | ​ | $ | 1,133
Warrants | ​ |  | 162 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 162
Total investments | ​ | $ | 1,806 | ​ | $ | — | ​ | $ | — | ​ | $ | (511) | ​ | $ | 1,295

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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