XML 62 R31.htm IDEA: XBRL DOCUMENT
v3.19.1

Recent accounting pronouncements - (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Disclosure Of Significant Accounting Policies [Abstract] |
Disclosure of changes in accounting policies | The Company has assessed the classification and measurement of its financial assets and financial liabilities under IFRS 9 and have summarized the original measurement categories under IAS 39 and the new measurement categories under IFRS 9 in the following table:
| Measurement Categories
|  | IAS 39 |  | IFRS 9
Financial instruments: |  |  |  |
Cash and cash equivalents |  | Amortized cost |  | Amortized cost
Debt service reserve account |  | Amortized cost |  | Amortized cost
Loans receivable |  | Amortized cost |  | Amortized cost
Long-term investments |  | FVTPL & FVOCI |  | FVOCI
Derivative financial instruments |  | FVTPL |  | FVTPL
Accounts payable and accrued liabilities |  | Amortized cost |  | Amortized cost
Convertible senior subordinated notes |  | FVTPL |  | FVTPL FVOCI for change in credit risk
Debt |  | Amortized cost |  | Amortized cost
Lease liabilities |  | Amortized cost |  | Amortized cost

X
- Definition Disclosure Of Significant Accounting Policies [Abstract] + References No definition available. + Details
Name: | btg_DisclosureOfSignificantAccountingPoliciesAbstract
Namespace Prefix: | btg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of changes made to accounting policies by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_10_e&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DisclosureOfChangesInAccountingPoliciesExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration