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Income taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Nov. 30, 2021 | Nov. 30, 2020
--- | --- | ---
Deferred income tax assets |  |
Non-capital losses | $ 54,502 | $ 51,250
Mineral property interest | 447 |
Deferred interest | 6,251 | 6,251
Property, plant and equipment | 82 | 88
Lease liability | 112 | 153
Share issuance costs | 103 | 267
Investments | 0 | 0
Other deductible temporary differences | 197 | 223
Total deferred tax assets | 61,694 | 58,232
Valuation allowance | (34,249) | (29,259)
Net deferred income tax assets | 27,445 | 28,973
Deferred income tax liabilities |  |
Investment in Ambler Metals LLC | (27,315) | (28,844)
Right of use asset | (130) | (129)
Deferred income tax liabilities | (27,445) | (28,973)
Net deferred income tax assets | $ 0 | $ 0

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