Provisions (Narrative) (Details) R$ in Thousands, $ in Thousands |
Dec. 31, 2025
BRL (R$)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
BRL (R$)
|
Dec. 31, 2024
USD ($)
|
|---|---|---|---|---|
| Disclosure of other provisions [line items] | ||||
| Amount of recognized provision legal proceedings matter | $ 3,741 | $ 3,060 | ||
| Contract penalties provision | $ 453 | $ 453 | ||
| Assumption of discount rates | 7.19% | 7.19% | 7.34% | 7.34% |
| Maracas Menchen Mine [Member] | ||||
| Disclosure of other provisions [line items] | ||||
| Provision for environmental compensation | $ 351 | |||
| Amount of provision for environmental compensation expected to be incurred next twelve months | 351 | $ 312 | ||
| Anticipated liability | R$ 82,153 | 14,930 | R$ 73,711 | 11,904 |
| Currais Novos Tungsten [Member] | ||||
| Disclosure of other provisions [line items] | ||||
| Anticipated liability | R$ 3,714 | $ 675 | R$ 3,555 | $ 574 |