Mineral Properties and development costs (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
May 31, 2020	Nov. 30, 2019	Nov. 30, 2018
Mineral properties and development costs		$ 30,631
Alaska, USA [Member]
Reimbursable Acquisition Costs	$ (44)
Acquisition costs		44
Mineral properties and development costs		30,631	$ 30,587
Assets derecognized	(30,587)
Ambler Properties [Member] \| Alaska, USA [Member]
Reimbursable Acquisition Costs	(44)
Acquisition costs		44
Mineral properties and development costs		26,631	26,587
Assets derecognized	(26,587)
Bornite Properties [Member] \| Alaska, USA [Member]
Mineral properties and development costs		$ 4,000	$ 4,000
Assets derecognized	$ (4,000)

The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10(c)(7)(ii))
-URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10(c)(3)(ii)(A))
-URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862

Name:	us-gaap_AcquisitionCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration