XML 93 R62.htm IDEA: XBRL DOCUMENT
v3.19.1

Long-term debt - Schedule of Long-Term Debt Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Aug. 23, 2013
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | $ 479,535 | $ 702,181 |
Principal and interest payable | 549,478 |  |
2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal and interest payable | 50,789 |  |
2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal and interest payable | 47,720 |  |
2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal and interest payable | 434,580 |  |
2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal and interest payable | 14,015 |  |
2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal and interest payable | 2,374 |  |
Convertible senior subordinated notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 0 | 277,650 |
Revolving credit facility: |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 395,822 | 344,149 |
Interest | 54,749 |  |
Revolving credit facility: | 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 21,731 |  |
Revolving credit facility: | 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 21,731 |  |
Revolving credit facility: | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 11,287 |  |
Revolving credit facility: | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 0 |  |
Revolving credit facility: | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 0 |  |
Fekola Equipment Loan Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 57,242 | 50,569 |
Interest | 6,278 |  |
Fekola Equipment Loan Facility | 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 2,764 |  |
Fekola Equipment Loan Facility | 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 1,946 |  |
Fekola Equipment Loan Facility | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 1,119 |  |
Fekola Equipment Loan Facility | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 377 |  |
Fekola Equipment Loan Facility | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 72 |  |
Otjikoto Equipment Loan Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 10,816 | 20,750 |
Interest | 758 |  |
Otjikoto Equipment Loan Facility | 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 428 |  |
Otjikoto Equipment Loan Facility | 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 234 |  |
Otjikoto Equipment Loan Facility | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 84 |  |
Otjikoto Equipment Loan Facility | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 12 |  |
Otjikoto Equipment Loan Facility | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 0 |  |
Masbate Equipment Loan Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 13,071 | 7,719 |
Interest | 1,871 |  |
Masbate Equipment Loan Facility | 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 787 |  |
Masbate Equipment Loan Facility | 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 570 |  |
Masbate Equipment Loan Facility | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 363 |  |
Masbate Equipment Loan Facility | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 142 |  |
Masbate Equipment Loan Facility | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 9 |  |
Finance lease obligations |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 2,186 | 0 |
Interest | 147 |  |
Finance lease obligations | 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 62 |  |
Finance lease obligations | 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 45 |  |
Finance lease obligations | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 28 |  |
Finance lease obligations | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 12 |  |
Finance lease obligations | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 0 |  |
Nicaraguan equipment loans |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 398 | 1,344 |
Interest | 9 |  |
Nicaraguan equipment loans | 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 9 |  |
Nicaraguan equipment loans | 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 0 |  |
Nicaraguan equipment loans | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 0 |  |
Nicaraguan equipment loans | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 0 |  |
Nicaraguan equipment loans | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest | 0 |  |
Principal | Convertible senior subordinated notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 0 | 258,750 | $ 259,000
Principal | Revolving credit facility: |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 400,000 | $ 350,000 |
Principal | Revolving credit facility: | 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 0 |  |
Principal | Revolving credit facility: | 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 0 |  |
Principal | Revolving credit facility: | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 400,000 |  |
Principal | Revolving credit facility: | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 0 |  |
Principal | Revolving credit facility: | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 0 |  |
Principal | Fekola Equipment Loan Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 58,634 |  |
Principal | Fekola Equipment Loan Facility | 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 15,869 |  |
Principal | Fekola Equipment Loan Facility | 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 15,869 |  |
Principal | Fekola Equipment Loan Facility | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 15,869 |  |
Principal | Fekola Equipment Loan Facility | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 9,397 |  |
Principal | Fekola Equipment Loan Facility | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 1,630 |  |
Principal | Otjikoto Equipment Loan Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 10,922 |  |
Principal | Otjikoto Equipment Loan Facility | 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 4,869 |  |
Principal | Otjikoto Equipment Loan Facility | 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 3,453 |  |
Principal | Otjikoto Equipment Loan Facility | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 1,958 |  |
Principal | Otjikoto Equipment Loan Facility | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 642 |  |
Principal | Otjikoto Equipment Loan Facility | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 0 |  |
Principal | Masbate Equipment Loan Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 13,526 |  |
Principal | Masbate Equipment Loan Facility | 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 3,347 |  |
Principal | Masbate Equipment Loan Facility | 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 3,347 |  |
Principal | Masbate Equipment Loan Facility | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 3,347 |  |
Principal | Masbate Equipment Loan Facility | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 2,908 |  |
Principal | Masbate Equipment Loan Facility | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 577 |  |
Principal | Finance lease obligations |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 2,186 |  |
Principal | Finance lease obligations | 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 525 |  |
Principal | Finance lease obligations | 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 525 |  |
Principal | Finance lease obligations | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 525 |  |
Principal | Finance lease obligations | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 525 |  |
Principal | Finance lease obligations | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 86 |  |
Principal | Nicaraguan equipment loans |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 398 |  |
Principal | Nicaraguan equipment loans | 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 398 |  |
Principal | Nicaraguan equipment loans | 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 0 |  |
Principal | Nicaraguan equipment loans | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 0 |  |
Principal | Nicaraguan equipment loans | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | 0 |  |
Principal | Nicaraguan equipment loans | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Principal | $ 0 |  |

X
- Definition Borrowings And Interest Payable + References No definition available. + Details
Name: | btg_BorrowingsAndInterestPayable
Namespace Prefix: | btg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Estimated Interest Payable + References No definition available. + Details
Name: | btg_EstimatedInterestPayable
Namespace Prefix: | btg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_Borrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=btg_RevolvingCreditFacility1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |