XML 206 R192.htm IDEA: XBRL DOCUMENT
v3.19.1

Exploration in non-operating areas (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | $ 36,307 | $ 18,262 | $ 26,589
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 | 22,764 | 5,401 | 13,629
Personnel expenses |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 4,830 | 4,064 | 3,908
Lands |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 1,867 | 1,781 | 0
Rentals |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | 1,524 | 1,171 | 578
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 | 1,420 | 582 | 768
Other expenses |  |  |
Disclosure Of Exploration In Non-Operating Areas [Line Items] |  |  |
Expense arising from exploration for and evaluation of non operating units | $ 3,902 | $ 5,263 | $ 7,706

X
- References No definition available. + Details
Name: | cik0001013131_DisclosureOfExplorationInNonoperatingAreasLineItems
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of expense arising from the search for mineral resources of non operating units. + References No definition available. + Details
Name: | cik0001013131_ExpenseArisingFromExplorationForAndEvaluationOfNonOperatingUnits
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | cik0001013131_ExpensesByNatureAxis=cik0001013131_ServicesProvidedByThirdPartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cik0001013131_ExpensesByNatureAxis=cik0001013131_PersonnelExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cik0001013131_ExpensesByNatureAxis=cik0001013131_LandsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cik0001013131_ExpensesByNatureAxis=cik0001013131_RentalsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cik0001013131_ExpensesByNatureAxis=cik0001013131_ConsumptionOfMaterialsAndSuppliesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cik0001013131_ExpensesByNatureAxis=cik0001013131_OtherExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |