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Related parties (Narrative) (Details) (USD $)
6 Months Ended 6 Months Ended
May 31, 2013
Nov. 30, 2012
May 31, 2013
NovaGold and Subsidiaries [Member]
Management and Office Services [Member]
May 31, 2013
The Company (NovaCopper) [Member]
Accounts Receivable [Member]
May 31, 2013
The Company (NovaCopper) [Member]
Accounts Payable [Member]
Nov. 30, 2012
The Company (NovaCopper) [Member]
Accounts Payable [Member]
May 31, 2013
The Company (NovaCopper) [Member]
Exploration and Managment Services [Member]
Related party transactions, amount of transaction     $ 153,000       $ 83,000
Due from related parties       34,000      
Due to related parties $ 61,000 $ 127,000     $ 61,000 $ 127,000