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Derivative financial instruments - Composition of open transactions (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
lb
Dec. 31, 2021
USD ($)
lb
Dec. 31, 2020
USD ($)
Disclosure of derivative financial instruments [Line Items]      
Financial instruments designated as hedging instruments, at fair value $ 8,839 $ 6,976  
Copper Price Hedging Instrument [Member]      
Disclosure of derivative financial instruments [Line Items]      
Quantity of commodity | lb 20,000 5,000  
Financial instruments designated as hedging instruments, at fair value $ 6,332 $ 8,839  
Settlement period one [Member] | Copper Price Hedging Instrument [Member]      
Disclosure of derivative financial instruments [Line Items]      
Quantity of commodity | lb 3,250 2,000  
Fixed Quotation $ 9,405 $ 10,185  
Future quotation 9,748 8,344  
Financial instruments designated as hedging instruments, at fair value $ 1,112 $ 4,332  
Settlement period one [Member] | Zinc Price Hedging Instrument [Member]      
Disclosure of derivative financial instruments [Line Items]      
Quantity of commodity | lb 500    
Fixed Quotation $ 3,450    
Future quotation 9,748    
Financial instruments designated as hedging instruments, at fair value $ 65    
Settlement period one [Member] | Minimum      
Disclosure of derivative financial instruments [Line Items]      
Fixed Quotation     $ 10,185
Settlement period two [Member] | Copper Price Hedging Instrument [Member]      
Disclosure of derivative financial instruments [Line Items]      
Quantity of commodity | lb 2,000 1,500  
Fixed Quotation $ 9,444 $ 10,109  
Future quotation 9,740 8,350  
Financial instruments designated as hedging instruments, at fair value $ 591 $ 1,867  
Settlement period two [Member] | Minimum      
Disclosure of derivative financial instruments [Line Items]      
Fixed Quotation     $ 10,109
Settlement period three [Member] | Copper Price Hedging Instrument [Member]      
Disclosure of derivative financial instruments [Line Items]      
Quantity of commodity | lb 2,000 1,500  
Fixed Quotation $ 9,525 $ 10,153  
Future quotation 9,732 8,353  
Financial instruments designated as hedging instruments, at fair value $ 413 $ 2,640  
Settlement period four [Member] | Copper Price Hedging Instrument [Member]      
Disclosure of derivative financial instruments [Line Items]      
Quantity of commodity | lb 2,700    
Fixed Quotation $ 9,103    
Future quotation 9,719    
Financial instruments designated as hedging instruments, at fair value $ 1,661    
Settlement period five [Member] | Copper Price Hedging Instrument [Member]      
Disclosure of derivative financial instruments [Line Items]      
Quantity of commodity | lb 3,050    
Fixed Quotation $ 9,175    
Future quotation 9,701    
Financial instruments designated as hedging instruments, at fair value $ 1,601    
Settlement period six [Member] | Copper Price Hedging Instrument [Member]      
Disclosure of derivative financial instruments [Line Items]      
Quantity of commodity | lb 1,000    
Fixed Quotation $ 9,425    
Future quotation 9,686    
Financial instruments designated as hedging instruments, at fair value $ 260    
Settlement period seven [Member] | Copper Price Hedging Instrument [Member]      
Disclosure of derivative financial instruments [Line Items]      
Quantity of commodity | lb 3,000    
Fixed Quotation $ 9,442    
Future quotation 9,676    
Financial instruments designated as hedging instruments, at fair value $ 701    
Settlement period ten [Member] | Copper Price Hedging Instrument [Member]      
Disclosure of derivative financial instruments [Line Items]      
Quantity of commodity | lb 1,500    
Fixed Quotation $ 9,762    
Future quotation 9,631    
Financial instruments designated as hedging instruments, at fair value $ (196)    
Settlement period twelve [Member] | Copper Price Hedging Instrument [Member]      
Disclosure of derivative financial instruments [Line Items]      
Quantity of commodity | lb 1,000    
Fixed Quotation $ 9,475    
Future quotation 9,600    
Financial instruments designated as hedging instruments, at fair value $ 124