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Background and basis of preparation (Details)
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Investments subject to significant influence      
Reverse stock split ratio     3
VRB Energy Inc      
Investments subject to significant influence      
Percentage of ownership interest acquired (in percent) 90.00% 90.00%  
Computational Geosciences Inc      
Investments subject to significant influence      
Percentage of ownership interest acquired (in percent) 94.30% 94.30%  
Cordoba Minerals Corp      
Investments subject to significant influence      
Percentage of ownership interest acquired (in percent) 63.20% 63.30%  
Kaizen Discovery Inc      
Investments subject to significant influence      
Percentage of ownership interest acquired (in percent) 82.50% 82.70%