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Related party transactions (Details)
$ in Thousands
 1 Months Ended 3 Months Ended
Oct. 24, 2022
USD ($)
transmitter
Oct. 31, 2022
USD ($)
Mar. 31, 2026
USD ($)
transmitter
Mar. 31, 2025
USD ($)
Feb. 28, 2026
USD ($)
Dec. 31, 2025
USD ($)
Total Expenses            
Accounts payable and accrued liabilities     $ 11,463     $ 16,309
Revenue and accounts receivable            
Trade accounts receivable     157     14
Revenue and accounts receivable, transactions for the period     858 $ 735    
Expense classification            
Exploration expenses     23,206 15,785    
General and administrative expenses     9,862 11,586    
I-Pulse | Purchase Price Of Transmitters            
Expense classification            
Total purchase price $ 12,400          
Related Party            
Total Expenses            
Accounts payable and accrued liabilities     0     2,399
Expense classification            
Exploration expenses     0 906    
General and administrative expenses     250 732    
Total Transactions Expenses     $ 250 1,638    
Related Party | CMH Colombia S.A.S            
Expense classification            
Bridge loan         $ 2,500  
Related Party | I-Pulse            
Expense classification            
Number of typhoon transmitters to be purchased | transmitter 6          
Front payment made   $ 7,100        
Percentage of component agreement (in percent)   0.50        
Number of typhoon transmitters received | transmitter     4      
Global Mining | Related Party            
Total Expenses            
Accounts payable and accrued liabilities     $ 0     649
Advances            
Related party advances     283     422
Expense classification            
Total Transactions Expenses     0 771    
Ivanhoe Capital Aviation | Related Party            
Total Expenses            
Accounts payable and accrued liabilities     0     0
Expense classification            
Total Transactions Expenses     0 250    
High Water Holding Company | Related Party            
Total Expenses            
Accounts payable and accrued liabilities           250
Expense classification            
Total Transactions Expenses     250      
I-Pulse | Related Party            
Total Expenses            
Accounts payable and accrued liabilities     0     0
Deposit            
Deposits     1,573     1,573
Expense classification            
Total Transactions Expenses     0 617    
JCHX Mining Management Co, Ltd. | Related Party            
Total Expenses            
Accounts payable and accrued liabilities     0     1,500
Expense classification            
Total Transactions Expenses     $ 0 0    
Maaden Joint Venture            
Expense classification            
Ownership percentage     50.00%      
Maaden Joint Venture | Related Party            
Revenue and accounts receivable            
Trade accounts receivable     $ 100     0
Revenue and accounts receivable, transactions for the period     529 $ 600    
Advances            
Related party advances     $ 237     $ 141
Cordoba | Related Party | Cordoba | JCHX Mining Management Co, Ltd.            
Expense classification            
Ownership percentage     18.20%     19.20%