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Impairment of long-lived assets (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Long-term zinc price (USD/t) $ 2,930 $ 2,800 $ 2,787
Exchange rate (BRL x USD) 5.66 4.84 5.22
Bottom of range [member]      
IfrsStatementLineItems [Line Items]      
Brownfield projects - LOM (years) 3 years 4 years 5 years
Top of range [member]      
IfrsStatementLineItems [Line Items]      
Brownfield projects - LOM (years) 25 years 21 years 24 years
Peru [member]      
IfrsStatementLineItems [Line Items]      
Discount rate 7.08% 7.22% 6.93%
Brazil [member]      
IfrsStatementLineItems [Line Items]      
Discount rate 7.64% 8.02% 8.03%