Exploration in non-operating areas (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	$ 24,766	$ 21,860	$ 13,452
Services provided by third parties
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	11,878	12,069	6,640
Personnel expenses
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	3,536	3,110	2,982
Diverse expenses
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	2,156	540	0
Consumption of materials and supplies
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	1,816	1,359	698
Professional fees
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	1,525	815	386
Laboratory analysis and tests
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	1,106	1,347	376
Short-term and low-value lease
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	1,020	826	368
Lands
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	796	1,091	982
Transport
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	281	242	244
Other
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	$ 652	$ 461	$ 776