Income taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Nov. 30, 2020	Nov. 30, 2019
Deferred income tax assets
Non-capital losses	$ 51,250	$ 48,968
Mineral property interest		11,351
Deferred interest	6,251	6,251
Property, plant and equipment	88	70
Lease liability	153
Share issuance costs	267	351
Capital Loss		186
Investments	0	0
Other deductible temporary differences	223	345
Total deferred tax assets	58,232	67,522
Valuation allowance	(29,259)	(67,519)
Net deferred income tax assets	28,973	3
Deferred income tax liabilities
Investment in Ambler Metals LLC	(28,844)
Right of use asset	(129)
Other taxable temporary differences		(3)
Deferred income tax liabilities	(28,973)	(3)
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 capital loss carryforwards.

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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 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 classified as other.

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