XML 119 R88.htm IDEA: XBRL DOCUMENT
v3.19.1

Supplementary cash flow information - Other exploration and development (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fekola |  |
Statement Of Cash Flows [Line Items] |  |
Other exploration and development | $ (14,246) | $ (8,441)
Otjikoto |  |
Statement Of Cash Flows [Line Items] |  |
Other exploration and development | (1,744) | (1,220)
Masbate |  |
Statement Of Cash Flows [Line Items] |  |
Other exploration and development | (4,941) | (4,668)
Libertad |  |
Statement Of Cash Flows [Line Items] |  |
Other exploration and development | (4,798) | (6,751)
Limon |  |
Statement Of Cash Flows [Line Items] |  |
Other exploration and development | (6,247) | (6,362)
Toega, Burkina Faso |  |
Statement Of Cash Flows [Line Items] |  |
Other exploration and development | (8,688) | (5,784)
Fekola Regional |  |
Statement Of Cash Flows [Line Items] |  |
Other exploration and development | (6,291) | (6,245)
Ondundu |  |
Statement Of Cash Flows [Line Items] |  |
Other exploration and development | (3,027) | (3,116)
Finland Properties, Finland |  |
Statement Of Cash Flows [Line Items] |  |
Other exploration and development | (2,479) | (1,341)
Kiaka |  |
Statement Of Cash Flows [Line Items] |  |
Other exploration and development | (2,238) | (4,512)
Other |  |
Statement Of Cash Flows [Line Items] |  |
Other exploration and development | (5,439) | (5,233)
Total |  |
Statement Of Cash Flows [Line Items] |  |
Other exploration and development | $ (60,138) | $ (53,673)

X
- Definition [Line Items] for Statement Of Cash Flows [Table] + References No definition available. + Details
Name: | btg_StatementOfCashFlowsLineItems
Namespace Prefix: | btg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow for expenses incurred by an entity in connection with the exploration for, and evaluation of, mineral resources before the technical feasibility and commercial viability of extracting a mineral resource are demonstrable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 14 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_14&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_PaymentsForExplorationAndEvaluationExpenses
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | btg_NameOfPropertyAxis=btg_FekolaMineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btg_NameOfPropertyAxis=btg_OtjikotoMineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btg_NameOfPropertyAxis=btg_MasbateMineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btg_NameOfPropertyAxis=btg_LibertadMineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btg_NameOfPropertyAxis=btg_LimonMineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btg_NameOfPropertyAxis=btg_ToegaBurkinaFasoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btg_NameOfPropertyAxis=btg_FekolaRegionalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btg_NameOfPropertyAxis=btg_OndunduNambibiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btg_NameOfPropertyAxis=btg_FinlandPropertiesFinlandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btg_NameOfPropertyAxis=btg_KiakaProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btg_NameOfPropertyAxis=btg_OtherProjectsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btg_NameOfPropertyAxis=btg_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |