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v3.21.1

BASIS OF PREPARATION - Disclosure of depreciation rates of major asset categories (Details) | 12 Months Ended
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Dec. 31, 2020
Land [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Depreciation rates of major asset categories | Not depreciated
Buildings [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Depreciation rates of major asset categories | Straight-line basis over 10-25 years
Plant and equipment [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Depreciation rates of major asset categories | Units-of-production basis
Mineral properties [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Depreciation rates of major asset categories | Straight-line basis over 5-20 years
Light vehicles and other mobile equipment [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Depreciation rates of major asset categories | Straight-line basis over 2-5 years
Furniture computer and office equipment [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Depreciation rates of major asset categories | Straight-line basis over 2-3 years

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- 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
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful lives or depreciation rate investment property cost model. + References No definition available. + Details
Name: | tgb_UsefulLivesOrDepreciationRateInvestmentPropertyCostModel
Namespace Prefix: | tgb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=tgb_PlantAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_MiningPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=tgb_LightVehiclesAndOtherMobileEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=tgb_FurnitureComputerAndOfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |