ROYALTY, STREAM, AND OTHER INTERESTS (Narrative) (Details) $ / shares in Units, $ / shares in Units, $ in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended | | |
Dec. 31, 2023 USD ($) Share | Nov. 30, 2023 $ / shares | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) $ / shares shares | Feb. 28, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) Share shares | Dec. 31, 2022 USD ($) shares | Dec. 01, 2023 USD ($) Share | Nov. 03, 2023 CAD ($) |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Purchase price of acquisition | | | | | | | $ 8,777 | $ 1,467 | | |
Sale of mineral claims | | | | | | | 4,972 | 0 | | |
Gain on sales of mineral claims | | | | | | | 5,093 | 0 | | |
Amount owed | $ 13,725 | | | | | $ 10,585 | 13,725 | 10,585 | | |
Acquisition payables | 2,928 | | | | | 0 | 2,928 | 0 | | |
Pine Valley [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Percentage of NSR royalty interest | | | 3% | | | | | | | |
Fair value of NSR royalty | $ 100 | | | | | | $ 100 | | | |
Sale of mineral claims | | | $ 5,000 | | | | | | | |
Gain on sales of mineral claims | | | $ 5,000 | | | | | | | |
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 | |
Number of common shares issued for acquisitions | Share | 34,943,542 | | | | | | 34,943,542 | | 34,635,331 | |
Number of common shares issued for acquisitions of royalty interests | shares | | | | | | | 34,943,542 | | | |
Common shares issued for acquisitions of royalty interests | | | | | | | $ 112,100 | | | |
Share price per share | $ / shares | | $ 4.34 | | | | | | | | |
Exchange price per share | $ / shares | | $ 1.356 | | | | | | | | |
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 | |
Aranzazu [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Percentage of NSR royalty interest | | | | | | | 1% | | | |
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% | | | |
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 | | | |
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 | | | | | | |
Number of common shares issued for acquisitions of royalty interests | shares | | | | 466,827 | | | 466,827 | | | |
Common shares issued for acquisitions of royalty interests | | | | $ 2,500 | | | $ 2,100 | | | |
Share price per share | $ / shares | | | | $ 4.44 | | | | | | |
Transaction costs on acquisition | | | | $ 200 | | | | | | |
Purchase price of agreement payable in shares | | | | 2,100 | | | | | | |
Estimation of mineral reserve of royalty | | | | 2,000 | | | | | | |
Outstanding payment of fair value acquisition date | | | | $ 2,500 | | | | | | |
Discount rate of acquisition date | | | | 10% | | | | | | |
Amount of estimated payment | | | | $ 1,900 | | | | | | |
Acquisition payables | | | | 2,500 | | | | | | |
Accretion expense | | | | $ 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% | | | | | | |
Alamos royalty portfolio acquisition [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Purchase price of agreement | | | | | $ 4,200 | | | | | |
Number of common shares issued for acquisitions of royalty interests | shares | | | | | 939,355 | | 939,355 | | | |
Common shares issued for acquisitions of royalty interests | | | | | | | $ 4,200 | | | |
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% | | | | | |
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% | | | | | |
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% | | | | | |
First Majestic Silver Corp [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Purchase price of agreement | | | | | | $ 21,600 | | $ 21,600 | | |
Number of common shares issued for acquisitions of royalty interests | shares | | | | | | 4,168,056 | | 4,168,056 | | |
Common shares issued for acquisitions of royalty interests | | | | | | | | $ 21,600 | | |
Share price per share | $ / shares | | | | | | $ 5.19 | | | | |
Transaction costs on acquisition | | | | | | $ 300 | | | | |
First Majestic Silver Corp [Member] | La Encantada Mine [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Percentage of GVR royalty interest | | | | | | | 100% | | | |
First Majestic Silver Corp [Member] | Del Toro Mine [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Percentage of NSR royalty interest | | | | | | | 2% | | | |
First Majestic Silver Corp [Member] | San Martin Mine [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Percentage of NSR royalty interest | | | | | | | 2% | | | |
First Majestic Silver Corp [Member] | La Luz Project [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Percentage of NSR royalty interest | | | | | | | 2% | | | |
Sierra Madre Gold and Silver Ltd [Member] | La Guitarra Mine [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Percentage of NSR royalty interest | | | | | | | 2% | | | |
GR Silver Mining Ltd [Member] | Plomosas Project [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Percentage of NSR royalty interest | | | | | | | 2% | | | |
Silver Storm Mining Ltd [Member] | La Parrilla Mine [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Percentage of NSR royalty interest | | | | | | | 2% | | | |
Silver Dollar Resources [Member] | La Joya Project [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Percentage of NSR royalty interest | | | | | | | 2% | | | |
Monarch [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Amount owed | | | | | | | | | | $ 10.1 |
Impairment charge | | | | | | | $ 1,100 | | | |
Barrick [Member] | Del Carmen Royalty [Member] | | | | | | | | | | |
Disclosure Of Royalty Interests And Deferred Acquisition Costs [Line Items] | | | | | | | | | | |
Percentage of NSR royalty interest | | | | | | | 0.50% | | | |
Impairment charge | | | | | | | $ 1,300 | | | |