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

Deferred interest

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

+ References

No definition available.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from mineral property impairment.

+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-2

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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
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-Name Accounting Standards Codification
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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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-Topic 740
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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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