v3.26.3
Deferred consideration - Narrative (Details)
$ / shares in Units, $ in Thousands
Jul. 18, 2025
USD ($)
$ / shares
Sep. 30, 2026
USD ($)
$ / shares
Dec. 31, 2025
$ / shares
Actuarial assumption of discount rates      
Disclosure of contingent liabilities [line items]      
Percentage of reasonably possible increase in actuarial assumption   1.00%  
Percentage of reasonably possible decrease in actuarial assumption   1.00%  
Decrease in fair value with 1% increase in discount rate   $ 490  
Increase in fair value with 1% decrease in discount rate   $ 510  
Measurement Input, Discount Rate      
Disclosure of contingent liabilities [line items]      
Business combination, deferred consideration measurement input   0.2041 0.1750
Measurement Input, Share Price      
Disclosure of contingent liabilities [line items]      
Business combination, deferred consideration measurement input | $ / shares   3.76 4.27
Measurement Input, Share Price | Actuarial assumption of discount rates      
Disclosure of contingent liabilities [line items]      
Percentage of reasonably possible increase in actuarial assumption   10.00%  
Decrease in fair value with 1% increase in discount rate   $ 890  
Measurement Input, Share Price | Actuarial assumption of discount rates | Bottom of range      
Disclosure of contingent liabilities [line items]      
Decrease in fair value with 1% increase in discount rate   $ 280  
Kabanga Nickel Limited      
Disclosure of contingent liabilities [line items]      
Percentage of Ownership (%) 100.00%    
Total consideration amount $ 10,000    
Aggregate funding $ 250,000    
Reference share price (in dollars per share) | $ / shares $ 4.16    
Reference amount $ 28,000    
Maximum amount of payment for contingent consideration arrangements $ 83,000    
Delayed case period 12 months    
Kabanga Nickel Limited | Bottom of range      
Disclosure of contingent liabilities [line items]      
Maximum payment amount, resettlement action plan triggering event $ 8,000    
Kabanga Nickel Limited | Top of range      
Disclosure of contingent liabilities [line items]      
Maximum payment amount, resettlement action plan triggering event $ 75,000    
Kabanga Nickel Limited | First Deferred Cash Payment      
Disclosure of contingent liabilities [line items]      
Period payable for fixed cash payment 30 days    
Period minimum to receive deferred cash payment 12 months    
Kabanga Nickel Limited | Second Deferred Cash Payment      
Disclosure of contingent liabilities [line items]      
Period payable for fixed cash payment 30 days    
Period minimum to receive deferred cash payment 12 months    
BHP | Kabanga Nickel Limited      
Disclosure of contingent liabilities [line items]      
Interest held 17.00%