XML 255 R241.htm IDEA: XBRL DOCUMENT
v3.19.1

Other Financial Liabilities (debt) (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 28, 2018 | Jun. 30, 2017 | Jun. 27, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2014
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |  |  |
Notional amount |  |  | $ 275,000,000 | $ 275,000,000 | $ 275,000,000 |  |
Borrowings |  |  |  | $ 271,382,000 | 272,575,000 |  |
Borrowings, interest rate basis | three months plus 2.15% |  | Three-month Libor plus 3% |  |  |  |
Description of amortization of credit facility |  |  |  | The credit facility calls for amortization in four installments, with 15% of the total facility due on December 31, 2020 (fully repaid as of December 31, 2018), 15% due on June 30, 2021 (fully repaid as of December 31, 2018), 35% due on December 31, 2021 (US$505 million after the December 2018 repayment) and 35% due on June 19, 2022 (US$525 million). |  |  |
Repayments of borrowings, classified as financing activities |  |  |  | $ 95,000,000 | 300,000,000 | $ 442,957,000 |
Write off debt issuance costs |  |  |  | 1,900,000 | 6,300,000 |  |
Senior unsecured credit facility [Member] |  |  |  |  |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |  |  |
Borrowings |  | $ 1,500,000,000 |  |  | $ 220,000,000 |  |
Repayments of borrowings, classified as financing activities |  |  |  | $ 470,000,000 |  |  |
Increased in Credit Facility |  | $ 225,000,000 |  |  |  |  |
Citi bank [Member] | Senior unsecured credit facility [Member] |  |  |  |  |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 1,800,000,000
Citi bank [Member] | Term loan [Member] |  |  |  |  |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |  |  |
Borrowings, interest rate basis |  |  |  | Interest on the credit facility is based on the London Interbank Offered Rate (LIBOR) plus a spread (currently 1.9%) based on the Company´s total net debt to earnings before interest, taxes, depreciation and amortization (EBITDA) ratio, as defined in the agreement. |  |  |
Sociedad Minera El Brocal S.A.A. [Member] | Citi bank [Member] |  |  |  |  |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |  |  |
Borrowings, interest rate basis |  |  |  | Interest on the credit facility is based on the London Interbank Offered Rate (LIBOR) plus a spread (currently 1.9%) based on the Company´s total net debt to earnings before interest, taxes, depreciation and amortization (EBITDA) ratio, as defined in the agreement. |  |  |

X
- Definition The description of amortization of credit facility. + References No definition available. + Details
Name: | cik0001013131_DescriptionOfAmortizationOfCreditFacility
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | cik0001013131_DisclosureOfOtherFinancialLiabilitiesDebtLineItems
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of increase in credit facility during the year. + References No definition available. + Details
Name: | cik0001013131_IncreasedInCreditFacility
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of expense recognised related to the write-off of debt issuance costs during the year. + References No definition available. + Details
Name: | cik0001013131_WriteOffDebtIssuanceCosts
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_Borrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_BorrowingsInterestRateBasis
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_NotionalAmount
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow to settle borrowings, classified as financing activities. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 17 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_17_d&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=cik0001013131_SeniorUnsecuredCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SeparateManagementEntitiesAxis=cik0001013131_CitiBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=cik0001013131_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=cik0001013131_SociedadMineraElBrocalSaaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |