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Exploration in non-operating areas (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Exploration In Non-Operating Areas [Abstract] |
Disclosure of detailed information about exploration in non-operating units [Text Block] | This caption is made up as follows:
|  | 2017 |  | 2016 |  | 2015 |
|  | US$(000) |  | US$(000) |  | US$(000) |
Services provided by third parties |  |  | 5,401 |  |  | 13,629 |  |  | 18,852 |
Personnel expenses |  |  | 4,064 |  |  | 3,908 |  |  | 4,713 |
Lands |  |  | 1,781 |  |  | 1,691 |  |  | - |
Rentals |  |  | 1,171 |  |  | 578 |  |  | 376 |
Consumption of materials and supplies |  |  | 582 |  |  | 768 |  |  | 1,436 |
Transport |  |  | 144 |  |  | 26 |  |  | 20 |
Maintenance and repairs |  |  | 134 |  |  | 72 |  |  | 87 |
Insurance |  |  | 27 |  |  | 49 |  |  | 84 |
Rights |  |  | - |  |  | 3,457 |  |  | - |
Other expenses |  |  | 4,958 |  |  | 2,411 |  |  | 5,042 |
|  |  | 18,262 |  |  | 26,589 |  |  | 30,610 |

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- Definition The disclosure of detailed information about exploration in non-operating units. + References No definition available. + Details
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Namespace Prefix: | cik0001013131_
Data Type: | nonnum:textBlockItemType
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Period Type: | duration

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- References No definition available. + Details
Name: | cik0001013131_DisclosureOfExplorationInNonoperatingAreasAbstract
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration