Commitments and contingencies (Narrative) (Details) t in Thousands, $ in Thousands |
12 Months Ended |
|---|---|
|
Dec. 31, 2025
USD ($)
t
| |
| Disclosure of maturity analysis of operating lease payments [line items] | |
| Minimum commitments under agreements | $ 2,181 |
| Additional payments upon the occurrence of certain events such as change of control | $ 2,181 |
| Purchase of vanadium | t | 178 |
| Minimum rental commitments remaining under lease | $ 65 |
| Due within one year [Member] | |
| Disclosure of maturity analysis of operating lease payments [line items] | |
| Minimum rental commitments remaining under lease | 52 |
| Maracas Menchen Mine [Member] | |
| Disclosure of maturity analysis of operating lease payments [line items] | |
| Remaining amounts due related to goods not received or services not rendered | $ 2,445 |