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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES |  |
Net loss | $ (5,476) | $ (5,837)
Items not affecting cash: |  |
Depletion | 2,509 | 2,389
Interest and accretion expense | 1,977 | 1,169
Finance charges | 339 | 206
Share-based payments | 2,632 | 2,255
Gain on sales of mineral claims | 0 | (5,093)
Share of net income of Silverback | (113) | (75)
Mark-to-market gain on derivative royalty asset | 0 | (684)
Mark-to-market gain on derivative loan liabilities | (493) | (673)
Loss on modification of loan payable | 0 | 1,658
Royalty interest impairment | 0 | 2,355
Income tax expense | 52 | 1,361
Unrealized foreign exchange loss (gain) | (671) | 485
Other | (25) | (136)
Total items not affecting cash before changes in non-cash working capital items | 731 | (620)
Payments received from derivative royalty asset | 806 | 2,715
Income taxes paid | (409) | (825)
Changes in non-cash working capital items: |  |
Accounts receivable | (511) | (262)
Prepaid expenses and other | 21 | 854
Trade and other payables | (3,211) | (1,344)
Net cash provided by (used in) operating activities | (2,573) | 518
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Acquisitions of royalty and stream interests | (2,199) | (8,777)
Dividends received from Silverback | 249 | 220
Sale of mineral claims | 0 | 4,972
Net cash used in investing activities | (1,950) | (3,585)
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Proceeds from private placement | 719 | 0
Proceeds from Beedie subscription | 0 | 11,113
Proceeds from exercise of stock options | 156 | 442
Proceeds from ATM, net of share issue costs | 0 | 4,142
Dividends paid | 0 | (1,195)
Interest paid | (58) | (809)
Finance charges paid | (339) | (864)
Net cash provided by financing activities | 478 | 12,829
Effect of exchange rate changes on cash and cash equivalents | (345) | (210)
Changes in cash and cash equivalents during period | (4,390) | 9,552
Cash and cash equivalents, beginning of period | 14,107 | 4,555
Cash and cash equivalents, end of period | $ 9,717 | $ 14,107

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- Definition The amount represents for gain losses on changes in fair value of derivative loan liability. + References No definition available. + Details
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Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount represents for gain on sales of mineral claims. + References No definition available. + Details
Name: | mta_GainOnSalesOfMineralClaims
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents amount related to prepaid expenses and other. + References No definition available. + Details
Name: | mta_IncreaseDecreasePrepaidExpensesAndOther
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from payment received from derivative royalty asset. + References No definition available. + Details
Name: | mta_PaymentsReceivedFromDerivativeRoyaltyAsset
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of Proceeds from At Market, net share issue costs. + References No definition available. + Details
Name: | mta_ProceedsFromAtMarketNetOfShareIssueCosts
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount represents for proceeds from beedie subscription. + References No definition available. + Details
Name: | mta_ProceedsFromBeedieSubscription
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of proceeds from private placement. + References No definition available. + Details
Name: | mta_ProceedsFromPrivatePlacement
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount represents for proceeds from sale of mineral claims. + References No definition available. + Details
Name: | mta_ProceedsFromSaleOfMineralClaims
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents amount related to finance charges paid. + References No definition available. + Details
Name: | mta_RepaymentsOfFinanceChargesPaid
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration