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Exploration in operating units (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Exploration In Operating Units [Line Items]      
Beginning balance of finished goods and products in process, net of depreciation and amortization $ 988 $ 2,036 $ 1,296
Exploration in operating units 49,229 80,796 56,412
Total exploration in operating units 48,790 79,748 57,152
Final balance of finished goods and products in process (549) (1,408) (2,036)
Write - off of products in process 0 420 0
Final balance of products in process and finished goods, net of depreciation and amortization (549) (988) (2,036)
Disbursement of exploration in operating activities 49,229 80,796 56,412
Services provided by third parties      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 35,785 51,912 45,437
Direct labor      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 6,357 7,097 3,891
Consumption of materials and supplies      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 2,694 4,502 3,839
Short-term and low-value lease      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 1,791 5,016 2,641
Transport      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 720 470 108
Electricity and water      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 237 72 834
Maintenance and repairment      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 66 211 165
Purchase of land      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 0 10,066 0
Other      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units $ 1,140 $ 402 $ 237