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Gold stream obligation - Narrative (Details) - oz
Dec. 31, 2025
Dec. 31, 2024
Apr. 20, 2023
Apr. 19, 2023
Disclosure of detailed information about financial instruments [line items]        
Gold steam obligation, delivery obligation, gold delivered, weight (in ounces) 632 0    
Wheaton Precious Metals        
Disclosure of detailed information about financial instruments [line items]        
Gold purchase price, percentage of listed gold price, during deposit period       18.00%
Gold purchase price, percentage of listed gold price, during non-deposit period       22.00%
Gold delivery obligation scenario one | Wheaton Precious Metals        
Disclosure of detailed information about financial instruments [line items]        
Gold delivery obligation, percentage     2.7805%  
Gold delivery obligation, quantity (in ounces)     87,100  
Gold delivery obligation scenario two | Wheaton Precious Metals        
Disclosure of detailed information about financial instruments [line items]        
Gold delivery obligation, percentage     1.4405%  
Gold delivery obligation, quantity (in ounces)     134,000  
Gold delivery obligation scenario three | Wheaton Precious Metals        
Disclosure of detailed information about financial instruments [line items]        
Gold delivery obligation, percentage     1.005%