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v3.25.1

ROYALTY, STREAM, AND OTHER INTERESTS (Narrative) (Details) $ / shares in Units, $ in Thousands, oz in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Nov. 30, 2023 $ / shares | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) oz $ / shares shares | Feb. 28, 2023 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) shares | Dec. 01, 2023 USD ($) Share | Dec. 31, 2020 USD ($)
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Sale of mineral claims |  |  |  |  |  | $ 0 | $ 4,972 |  |
Gain on sales of mineral claims |  |  |  |  |  | 0 | 5,093 |  |
Acquisition payables | $ 2,928 |  |  |  |  | 2,233 | 2,928 |  |
Nova Royalty Corp [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Share exchange ratio |  |  |  |  |  |  |  | 0.36 |
Number of Metalla Shares issued to Nova shareholders | Share |  |  |  |  |  |  |  | 33,893,734 |
Number of Metalla Shares issued to Nova RSU holders | Share |  |  |  |  |  |  |  | 741,597 |
Percentage of ownership interest in subsidiary | 60.41% |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests | 39.59% |  |  |  |  |  |  |  |
Mineral interests |  |  |  |  |  |  |  | $ 130,980 |
Current assets |  |  |  |  |  |  |  | 1,000 |
Current liabilities |  |  |  |  |  |  |  | $ 6,187 |
Common shares issued for acquisitions of royalty interests |  |  |  |  |  |  | $ 112,100 |  |
Number of common shares issued for acquisitions of royalty interests | shares |  |  |  |  |  |  | 34,943,542 |  |
Share price per share | $ / shares |  | $ 4.34 |  |  |  |  |  |  |
Aranzazu [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of NSR royalty interest |  |  |  |  |  |  | 1.00% |  |
Fair value of NSR royalty | $ 10,400 |  |  |  |  |  | $ 10,400 |  |
Taca Taca [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of NSR royalty interest |  |  |  |  |  |  | 0.42% |  |
Fair value of NSR royalty | 34,600 |  |  |  |  |  | $ 34,600 |  |
Vizcachitas [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of NSR royalty interest - open pit operations |  |  |  |  |  |  | 0.98% |  |
Percentage of NSR royalty interest - underground operations |  |  |  |  |  |  | 0.49% |  |
Fair value of NSR royalty | 33,100 |  |  |  |  |  | $ 33,100 |  |
NuevaUnión [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of NSR royalty interest |  |  |  |  |  |  | 2.00% |  |
Fair value of NSR royalty | 21,200 |  |  |  |  |  | $ 21,200 |  |
Copper World Complex [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of NSR royalty interest |  |  |  |  |  |  | 0.315% |  |
Right of first refusal on NSR royalty |  |  |  |  |  |  | 0.36% |  |
Fair value of NSR royalty | $ 12,700 |  |  |  |  |  | $ 12,700 |  |
Pine Valley [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Sale of mineral claims |  |  | $ 5,000 |  |  |  |  |  |
Percentage of NSR royalty interest |  |  | 3.00% |  |  |  |  |  |
Gain on sales of mineral claims |  |  | $ 5,000 |  |  |  |  |  |
Fair value of NSR royalty |  |  |  |  |  |  |  |  | $ 100
Lama Royalties Acquisition [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of agreement |  |  |  | $ 6,500 |  |  |  |  |
Purchase price of acquisition paid in cash |  |  |  | 2,500 |  |  |  |  |
Purchase price of agreement payable in shares |  |  |  | 2,100 |  |  |  |  |
Common shares issued for acquisitions of royalty interests |  |  |  | $ 2,500 |  |  | $ 2,100 |  |
Gold mineral reserve estimate | oz |  |  |  | 2 |  |  |  |  |
Number of common shares issued for acquisitions of royalty interests | shares |  |  |  | 466,827 |  |  | 466,827 |  |
Share price per share | $ / shares |  |  |  | $ 4.44 |  |  |  |  |
Outstanding payment of fair value acquisition date |  |  |  | $ 2,500 |  |  |  |  |
Discount rate of acquisition date |  |  |  | 10.00% |  |  |  |  |
Amount of estimated payment |  |  |  | $ 1,900 |  |  |  |  |
Acquisition payables |  |  |  | 2,500 |  |  |  |  |
Transaction costs on acquisition |  |  |  | $ 200 |  |  |  |  |
Accretion Expenses |  |  |  |  |  | $ 200 | $ 100 |  |
Lama Royalties Acquisition [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of NSR royalty interest - gold |  |  |  | 2.50% |  |  |  |  |
Percentage of NSR royalty interest - other metals |  |  |  | 0.25% |  |  |  |  |
Lama Royalties Acquisition [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of NSR royalty interest - gold |  |  |  | 3.75% |  |  |  |  |
Percentage of NSR royalty interest - other metals |  |  |  | 3.00% |  |  |  |  |
Alamos Royalty Portfolio Acquisition [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of agreement |  |  |  |  | $ 4,200 |  |  |  |
Common shares issued for acquisitions of royalty interests |  |  |  |  |  |  | $ 4,200 |  |
Number of common shares issued for acquisitions of royalty interests | shares |  |  |  |  | 939,355 |  | 939,355 |  |
Share price per share | $ / shares |  |  |  |  | $ 4.42 |  |  |  |
Transaction costs on acquisition |  |  |  |  | $ 100 |  |  |  |
Zacatecas Silver Corp [Member] | Esperanza Project [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of GVR royalty interest |  |  |  |  | 20.00% |  |  |  |
Mayfair Gold Corp [Member] | Fenn Gibb South Project [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of NSR royalty interest |  |  |  |  | 1.40% |  |  |  |
Platinex Inc [Member] | Ronda Project [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of NSR royalty interest |  |  |  |  | 2.00% |  |  |  |
New Path Resources Inc [Member] | Northshore West Property [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Percentage of NSR royalty interest |  |  |  |  | 2.00% |  |  |  |
Del Carmen acquisition [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  | $ 2,355 |  |

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