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Exploration expense (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 22, 2023
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Exploration expenses   $ 32,551 $ 23,863 $ 59,110 $ 41,186
Santa Cruz, USA          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Exploration expenses   15,043 14,763 29,725 24,561
San Matias, Colombia          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Exploration expenses   10,109 3,397 14,767 5,773
Tintic, USA          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Exploration expenses   1,954 407 3,075 696
Hog Heaven, USA          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Exploration expenses   416 308 1,054 868
Carolina, USA          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Exploration expenses   790 514 1,028 514
White Hill, USA          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Exploration expenses   259 0 750 0
Maximum project ownership (in percent) 0.80        
Expenditures required to achieve maximum ownership interest $ 10,000        
White Hill, USA | Exiro Minerals USA Corp. (“Exiro”)          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Payments required to achieve maximum ownership interest 5,000        
Cash payments for maximum ownership interest 3,600        
Common stock value for maximum ownership interest $ 1,400        
Period to achieve maximum ownership (in years) 6 years        
Pinaya, Peru          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Exploration expenses   493 1,465 650 2,151
Lincoln, USA          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Exploration expenses   182 326 477 339
Generative exploration and other          
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]          
Exploration expenses   $ 3,305 $ 2,683 $ 7,584 $ 6,284