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Exploration in non-operating areas (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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