Impairment of long-lived assets (Details 1) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| IfrsStatementLineItems [Line Items] | |||
| Long-term zinc price (USD/t) | $ 3,120 | $ 2,930 | $ 2,800 |
| Exchange rate (BRL x USD) | 5.43 | 5.66 | 4.84 |
| Bottom of range [member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Brownfield projects - LOM (years) | 3 years | 3 years | 4 years |
| Top of range [member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Brownfield projects - LOM (years) | 25 years | 25 years | 21 years |
| P E [Member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Discount rate | 7.08% | 7.08% | 7.22% |
| Brazil [Member] | |||
| IfrsStatementLineItems [Line Items] | |||
| Discount rate | 7.63% | 7.64% | 8.02% |