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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%

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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