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Exploration in operating units (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Exploration In Operating Units [Line Items]      
Beginning balance of finished goods and products in process, net of depreciation and amortization $ 549 $ 988 $ 2,036
Exploration in operating units 50,884 49,229 80,796
Total exploration in operating units 51,043 48,790 79,748
Final balance of finished goods and products in process (708) (549) (1,408)
Write - off of products in process 0 0 420
Final balance of products in process and finished goods, net of depreciation and amortization (708) (549) (988)
Disbursement of exploration in operating activities 50,884 49,229 80,796
Services provided by third parties      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 35,667 35,785 51,912
Consumption of materials and supplies      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 4,223 2,694 4,502
Direct labor      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 3,244 6,357 7,097
Short-term and low-value lease      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 3,097 1,791 5,016
Electricity and water      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 338 237 72
Transport      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 108 720 470
Maintenance and repairment      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 40 66 211
Purchase of land      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units 0 0 10,066
Other      
Disclosure Of Exploration In Operating Units [Line Items]      
Exploration in operating units $ 4,326 $ 1,140 $ 402