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Property, plant, equipment and development costs - Estimates prices for the current and long-term periods (Details)
Dec. 31, 2022
$ / oz
$ / t
Dec. 31, 2021
$ / oz
$ / t
Less than 1 year | Gold per ounce [Member]    
Property, plant, equipment and development costs    
Commodity price estimates | $ / oz 1,750 1,700
Less than 1 year | Silver [Member]    
Property, plant, equipment and development costs    
Commodity price estimates | $ / oz 21.00 24.00
Less than 1 year | Copper [Member]    
Property, plant, equipment and development costs    
Commodity price estimates 7,900 8,500
Less than 1 year | Lead [Member]    
Property, plant, equipment and development costs    
Commodity price estimates 1,900 2,000
Less than 1 year | Zinc [Member]    
Property, plant, equipment and development costs    
Commodity price estimates 3,000 2,600
Between 1 and 2 years | Gold per ounce [Member]    
Property, plant, equipment and development costs    
Commodity price estimates | $ / oz 1,735 1,764
Between 1 and 2 years | Silver [Member]    
Property, plant, equipment and development costs    
Commodity price estimates | $ / oz 23.17 27.30
Between 1 and 2 years | Copper [Member]    
Property, plant, equipment and development costs    
Commodity price estimates 9,625 8,705
Between 1 and 2 years | Lead [Member]    
Property, plant, equipment and development costs    
Commodity price estimates 2,181 2,313
Between 1 and 2 years | Zinc [Member]    
Property, plant, equipment and development costs    
Commodity price estimates 2,648 2,616