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v3.25.1

ACCOUNTS RECEIVABLE (Tables) | 12 Months Ended
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Dec. 31, 2024
Trade and other receivables [abstract] |
Disclosure of detailed information about accounts receivables [Table Text Block] |
|  | As at |
|  | December 31, |  |  |  | December 31, |
|  | 2024 |  |  |  | 2023 |
Royalty, derivative royalty, and stream receivables | $ | 2,253 |  |  | $ | 2,482 |
GST and other recoverable taxes |  | 251 |  |  |  | 325 |
Other receivables |  | 12 |  |  |  | 4 |
Total accounts receivable | $ | 2,516 |  |  | $ | 2,811 |

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
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- Definition Tabular disclosure of the trade receivable and the gross carrying value, allowance, and net carrying value as of the balance sheet date. + References No definition available. + Details
Name: | mta_DisclosureOfDetailedInformationAboutTradeAndOtherReceivablesExplanatory
Namespace Prefix: | mta_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration