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Income taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Nov. 30, 2023 | Nov. 30, 2022
--- | --- | ---
Deferred income tax assets |  |
Non-capital losses | $ 60,255 | $ 57,236
Mineral property interest | 4,926 | 3,061
Mineral property impairment | 26 | 17
Deferred interest | 6,251 | 6,251
Property, plant and equipment | 88 | 86
Lease liability | 9 | 60
Share issuance costs | (5) | 6
Other deductible temporary differences | 166 | 181
Total deferred tax assets | 71,716 | 66,898
Valuation allowance | (44,456) | (40,555)
Net deferred income tax assets | 27,260 | 26,343
Deferred income tax liabilities |  |
Investment in Ambler Metals LLC | (27,229) | (26,257)
Right of use asset | (31) | (86)
Deferred income tax liabilities | (27,260) | (26,343)
Net deferred income tax assets | $ 0 | $ 0

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