Fair value measurement - Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Level 1
Financial assets:
Investments subject to significant influence	$ 5,108	$ 7,044
Other investments	2,220	1,802
Total financial assets	7,328	8,846
Financial liabilities:
Ivanhoe Electric convertible notes	0	0
Deferred consideration payable	0	0
Total financial liabilities	0	0
Level 2
Financial assets:
Investments subject to significant influence	0	0
Other investments	0	0
Total financial assets	0	0
Financial liabilities:
Ivanhoe Electric convertible notes	0	0
Deferred consideration payable	0	0
Total financial liabilities	0	0
Level 3
Financial assets:
Investments subject to significant influence	0	0
Other investments	0	0
Total financial assets	0	0
Financial liabilities:
Ivanhoe Electric convertible notes	0	54,975
Deferred consideration payable	0	26,562
Total financial liabilities	$ 0	$ 81,537