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Exploration in operating units (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Exploration In Operating Units [Abstract] |
Disclosure of detailed information about exploration and evaluation assets [Text Block] | This caption is made up as follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Beginning balance of finished goods and products in process, net of depreciation and amortization |  |  | 5,157 |  |  |  | 5,309 |  |  |  | 3,106 |
Exploration in operating units |  |  |  |  |  |  |  |  |  |  |  |
Services provided by third parties |  |  | 71,927 |  |  |  | 79,837 |  |  |  | 81,464 |
Consumption of materials and supplies |  |  | 8,605 |  |  |  | 8,236 |  |  |  | 12,685 |
Direct labor |  |  | 2,446 |  |  |  | 2,373 |  |  |  | 1,974 |
Rentals |  |  | 2,072 |  |  |  | 1,527 |  |  |  | 1,608 |
Electricity and water |  |  | 1,524 |  |  |  | 1,328 |  |  |  | 21 |
Maintenance and repair |  |  | 450 |  |  |  | 100 |  |  |  | 62 |
Transport |  |  | 192 |  |  |  | 587 |  |  |  | 317 |
Depreciation and amortization |  |  | 23 |  |  |  | - |  |  |  | - |
Other |  |  | 784 |  |  |  | 109 |  |  |  | 379 |
Total exploration in operating units |  |  | 88,023 |  |  |  | 94,097 |  |  |  | 98,510 |
Final balance of products in process and finished goods, net of depreciation and amortization |  |  | (2,837 | ) |  |  | (4,478 | ) |  |  | (5,467 | )
Exploration in operating units |  |  | 90,343 |  |  |  | 94,928 |  |  |  | 96,149 |

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- Definition The entire disclosure for exploration and evaluation assets. + 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_DisclosureOfExplorationInOperatingUnitsAbstract
Namespace Prefix: | cik0001013131_
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Balance Type: | na
Period Type: | duration