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OTHER (EXPENSE) INCOME - Disclosure of other expense income (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Other Expense Income [Abstract] |  |
Management fee income | $ 1,198 | $ 1,186
Other operating (expense) income, net | 297 | (266)
Other (expenses) income | $ 1,495 | $ 920

X
- Definition The amount of operating income (expense) that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_OtherOperatingIncomeExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Management fee income. + References No definition available. + Details
Name: | tgb_ManagementFeeIncome
Namespace Prefix: | tgb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Other income and expense. + References No definition available. + Details
Name: | tgb_OtherIncomeAndExpense
Namespace Prefix: | tgb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration