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Cost of sales, without considering depreciation and amortization (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Cost Of Sales [Abstract] |
Disclosure of detailed information of cost of sale of goods and services [Text Block] |
| (a) | The cost of sales of goods is made up as follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Beginning balance of finished goods and products in process, net of depreciation and amortization |  |  | 37,640 |  |  |  | 58,633 |  |  |  | 69,932 |
Cost of production |  |  |  |  |  |  |  |  |  |  |  |
Services provided by third parties |  |  | 245,705 |  |  |  | 262,195 |  |  |  | 211,325 |
Consumption of materials and supplies |  |  | 136,991 |  |  |  | 134,070 |  |  |  | 100,401 |
Direct labor |  |  | 96,612 |  |  |  | 87,886 |  |  |  | 72,344 |
Electricity and water |  |  | 51,226 |  |  |  | 44,345 |  |  |  | 41,989 |
Transport |  |  | 24,805 |  |  |  | 16,254 |  |  |  | 10,880 |
Maintenance and repair |  |  | 24,459 |  |  |  | 22,839 |  |  |  | 17,792 |
Rentals |  |  | 31,156 |  |  |  | 26,591 |  |  |  | 10,852 |
Insurances |  |  | 11,550 |  |  |  | 6,637 |  |  |  | 4,347 |
Provision (reversal) for impairment of finished goods and product in progress, note 8(c) |  |  | 4,521 |  |  |  | 2,118 |  |  |  | (7,581 | )
Cost of concentrate purchased to third parties |  |  | - |  |  |  | 439 |  |  |  | 2,958 |
Other production expenses |  |  | 10,025 |  |  |  | 10,464 |  |  |  | 9,789 |
Total cost of production of the period |  |  | 637,050 |  |  |  | 613,838 |  |  |  | 475,096 |
Final balance of products in process and finished goods, net of depreciation and amortization |  |  | (49,206 | ) |  |  | (45,038 | ) |  |  | (47,216 | )
Cost of sales of goods, without considering depreciation and amortization |  |  | 625,484 |  |  |  | 627,433 |  |  |  | 497,812 |
| (b) | The cost of services is made up as follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Direct labor |  |  | 2,128 |  |  |  | 7,398 |  |  |  | 5,983 |
Consumption of materials and supplies |  |  | 675 |  |  |  | 1,026 |  |  |  | 868 |
Maintenance and repair |  |  | 543 |  |  |  | 946 |  |  |  | 217 |
Services provided by third parties |  |  | 382 |  |  |  | 1,782 |  |  |  | 1,689 |
Electricity and water |  |  | 249 |  |  |  | 586 |  |  |  | 633 |
Rentals |  |  | 92 |  |  |  | 423 |  |  |  | 480 |
Insurances |  |  | 86 |  |  |  | 246 |  |  |  | 212 |
Transport |  |  | 50 |  |  |  | 98 |  |  |  | 213 |
Other |  |  | 113 |  |  |  | 449 |  |  |  | 459 |
|  |  | 4,318 |  |  |  | 12,954 |  |  |  | 10,754 |

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- References No definition available. + Details
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Namespace Prefix: | cik0001013131_
Data Type: | xbrli:stringItemType
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- Definition The disclosure of detailed information of Cost of sale of goods and services. + References No definition available. + Details
Name: | cik0001013131_DisclosureOfDetailedInformationOfCostOfSaleOfGoodsAndServicesTextBlock
Namespace Prefix: | cik0001013131_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration