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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