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FINANCIAL RISK MANAGEMENT - Disclosure of exposure to commodity price risk (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Commodity price risk [Member] |  |
Disclosure Of Commodity Price Risk For Financial Instruments [Line Items] |  |
Copper increase/decrease by US$0.37/lb. (2019: US$0.28/lb.) | $ 9,542 | $ 7,992

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- Definition Disclosure of commodity price risk for financial instruments. + References No definition available. + Details
Name: | tgb_DisclosureOfCommodityPriceRiskForFinancialInstrumentsLineItems
Namespace Prefix: | tgb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Impact on pre-tax earnings and equity for changes in commodity prices on the fair value of derivatives and the provisionally invoiced sales volumes. + References No definition available. + Details
Name: | tgb_ImpactOfPreTaxEarningsAndEquityChangesInCommodityPrices
Namespace Prefix: | tgb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CommodityPriceRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |