v3.26.1
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