Schedule of Mineral Properties and Development Costs (Details) - USD ($) $ in Thousands	12 Months Ended
Nov. 30, 2014	May. 31, 2015
Mineral properties and development costs	$ 30,586	$ 30,586
Alaska, USA [Member]
Acquisition costs	0
Mineral properties and development costs	30,586	30,586
Ambler Property [Member] \| Alaska, USA [Member]
Acquisition costs	0
Mineral properties and development costs	26,586	26,586
Bornite Property [Member] \| Alaska, USA [Member]
Acquisition costs	0
Mineral properties and development costs	$ 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://www.xbrl.org/2003/role/presentationRef

-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=27015464&loc=d3e511914-122862

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 10

-Paragraph c

-Subparagraph 3(ii)(A)

-Article 4

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