Mineral Properties and development costs (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Aug. 31, 2019	Nov. 30, 2018	Nov. 30, 2017
Mineral properties and development costs	$ 30,587	$ 30,587
Alaska, USA [Member]
Acquisition costs	0	0
Mineral properties and development costs	30,587	30,587	$ 30,587
Ambler Propertyss [Member] \| Alaska, USA [Member]
Acquisition costs	0	0
Mineral properties and development costs	26,587	26,587	26,587
Bornite Propertys [Member] \| Alaska, USA [Member]
Acquisition costs	0	0
Mineral properties and development costs	$ 4,000	$ 4,000	$ 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