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

Deferred interest

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from lease liability.

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Mineral property interest

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as share issuance costs.

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Deferred Tax Liabilities Mineral Property Interest

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible loss carryforwards, classified as other.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Amount of deferred tax liability attributable to taxable temporary differences from leasing arrangements.

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