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Exploration in non-operating areas (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | $ 18,262 | $ 26,589 | $ 30,610
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 | 5,401 | 13,629 | 18,852
Personnel expenses |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 4,064 | 3,908 | 4,713
Rights |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 0 | 3,457 | 0
Lands |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 1,781 | 1,691 | 0
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 | 582 | 768 | 1,436
Rentals |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 1,171 | 578 | 376
Maintenance and repairs |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 134 | 72 | 87
Insurance |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 27 | 49 | 84
Transport |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 144 | 26 | 20
Other expenses |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | $ 4,958 | $ 2,411 | $ 5,042

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