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Exploration in non-operating areas (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | $ 8,475 | $ 11,879 | $ 36,307
Personnel expenses [Member] |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 1,705 | 3,632 | 4,830
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 | 3,326 | 3,611 | 22,764
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 | 1,538 | 766 | 1,211
Lands [Member] |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 420 | 1,528 | 1,867
Short-term and low-value lease [Member] |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 327 | 415 | 1,524
Consumption of materials and supplies [Member] |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 201 | 328 | 1,420
Other expenses [Member] |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | $ 958 | $ 1,599 | $ 2,691

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