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Exploration in non-operating areas (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	$ 14,252	$ 11,270	$ 8,475
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	6,324	4,742	3,326
Personnel expenses
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	2,898	2,748	1,705
Lands
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	1,190	967	420
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	917	612	327
Laboratory analysis and tests
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	862	508	225
Professional fees
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	557	439	1,538
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	467	251	201
Transport
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	173	191	89
Other
Disclosure Of Exploration In Non-Operating Areas [Line Items]
Expense arising from exploration for and evaluation of non operating units	$ 864	$ 812	$ 644