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Related party transactions - Summary of transactions between the Company and certain significant related parties (Details) $ in Thousands		1 Months Ended		3 Months Ended		6 Months Ended
	Oct. 24, 2022 USD ($) transmitter	Dec. 31, 2022 USD ($)	Oct. 31, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Total Expenses
Other non-current liabilities		$ 388		$ 767		$ 767
Expense classification
Exploration expenses				32,551	$ 23,863	59,110	$ 41,186
General and administrative expenses				12,658	4,659	23,291	9,885
Research and development expenses				2,138	1,257	3,981	2,588
Purchase Price Of Transmitters | I-Pulse Inc.
Expense classification
Total purchase price	$ 12,400
Related Party
Total Expenses
Other non-current liabilities		1,466		1,606		1,606
Expense classification
Exploration expenses				3,290	2,015	6,332	3,530
General and administrative expenses				2,357	1,580	4,388	3,052
Research and development expenses				658	0	1,308	0
Total Transactions Expenses				6,305	3,595	12,028	6,582
Related Party | Global Mining
Total Expenses
Other non-current liabilities		1,383		1,606		1,606
Advances
Advances		$ 1,987		2,317		2,317
Expense classification
Total Transactions Expenses				$ 4,897	3,345	$ 9,213	6,082
Related Party | Global Mining | Global Mining
Expense classification
Ownership percentage in outstanding common shares (in percent)		7.10%		7.10%		7.10%
Related Party | Ivanhoe Capital Aviation
Total Expenses
Other non-current liabilities		$ 83		$ 0		$ 0
Expense classification
Total Transactions Expenses				250	250	500	500
Related Party | I-Pulse Inc.
Total Expenses
Other non-current liabilities		0		0		0
Deposit
Deposits		7,128		4,985		4,985
Expense classification
Research and development expenses	$ 2,800
Total Transactions Expenses				1,158	$ 0	2,315	$ 0
Number of typhoon transmitters to be purchased | transmitter	6
Term of agreement (in years)	3 years
Annual maintenance costs	$ 1,700
Front payment made			$ 7,100
Percentage of component agreement (in percent)			0.50
Related Party | JCHX Mining Management Co, Ltd.
Deposit
Bridge loan		10,010		$ 0		$ 0
Cordoba | JCHX Bridge Loan | Related Party
Deposit
Bridge loan		$ 10,000
JCHX Mining Management Co, Ltd. | Related Party | Cordoba | Cordoba
Expense classification
Ownership percentage in outstanding common shares (in percent)		19.90%		19.90%		19.90%
JCHX Mining Management Co, Ltd. | Bridge Loan | Related Party | Cordoba
Expense classification
Debt term (in years)		18 months
JCHX Mining Management Co, Ltd. | Bridge Loan, First 12 Months | Bridge Loan | Related Party | Cordoba
Expense classification
Interest rate on convertible debt (in percent)		12.00%
JCHX Mining Management Co, Ltd. | Bridge Loan, Remaining 6 Months | Bridge Loan | Related Party | Cordoba
Expense classification
Interest rate on convertible debt (in percent)		14.00%

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Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.

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