v3.26.1
Financial risk management (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Gain from settled non-hedge contracts $ 1,000  
Gain from unsettled non-hedge contracts 4,600  
Derivative financial assets 4,773 $ 0
Gain or loss on derivative instruments 5,600 0
Gain on convertible debenture 6,300 200
Credit risk [Member] | Trade and Other Receivables [Member]    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instrument $ 5,200 3,600
Liquidity risk [Member] | Bottom of range [Member]    
Disclosure of detailed information about financial instruments [line items]    
Incremental borrowing rate 6.00%  
Liquidity risk [Member] | Top of range [Member]    
Disclosure of detailed information about financial instruments [line items]    
Incremental borrowing rate 11.00%  
U.S. LIBOR [Member]    
Disclosure of detailed information about financial instruments [line items]    
Interest rate 7.20%  
U.S. SOFR [Member]    
Disclosure of detailed information about financial instruments [line items]    
Interest rate 4.75%  
U.S. SOFR one [Member]    
Disclosure of detailed information about financial instruments [line items]    
Interest rate 6.00%  
CAD/USD Exchange rate [Member]    
Disclosure of detailed information about financial instruments [line items]    
Exchange rates 1.37  
MXN/USD Exchange rate [Member]    
Disclosure of detailed information about financial instruments [line items]    
Exchange rates 17.97  
Market risk [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables $ 500 400
Metals contract liability 4,500 4,100
Silver contract liability $ 4,200 $ 1,800
Silver [Member]    
Disclosure of detailed information about financial instruments [line items]    
Options description Silver put options for 60,000 ounces per month from July 2025 to June 2026 at a strike price of $29 per ounce valued at total cost of $0.3 million at inception.  
Gold [Member]    
Disclosure of detailed information about financial instruments [line items]    
Forward options description Gold forward options to buy 1,275 ounces every three months from September 2025 to June 2026 at prices between $3,375 and $3,541 per ounce.  
Call option description Gold call options to buy 1,259 to 1,275 ounces every three months from September 2026 to December 2027 at a strike price of $3,500 per ounce valued at total cost of $3.4 million at inception.  
Zinc [Member]    
Disclosure of detailed information about financial instruments [line items]    
Forward options description Zinc forward options to sell approximately 200,000 pounds per month from August 2025 to December 2025 at $1.27 per pound.  
Lead [Member]    
Disclosure of detailed information about financial instruments [line items]    
Forward options description Lead forward options to sell approximately 500,000 pounds per month from August 2025 to January 2026 at $0.91 per pound.  
Copper [Member]    
Disclosure of detailed information about financial instruments [line items]    
Forward options description Copper forward options to sell approximately 100,000 to 250,000 pounds per month from August 2025 to July 2026 at $4.39 per pound.