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Mineral properties and development costs (Narrative) (Details) (USD $)
12 Months Ended 128 Months Ended 1 Months Ended 8 Months Ended 1 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2014
Jan. 31, 2011
Jan. 31, 2010
Aug. 05, 2012
Oct. 31, 2011
Jan. 11, 2010
Jan. 31, 2012
Aug. 05, 2011
Dec. 31, 2009
Oct. 19, 2011
Mineral property interest percentage                 100.00%ncq_MineralPropertyRightOwnershipPercentage        
Payments for mineral property $ 0us-gaap_PaymentsToAcquireMineralRights $ 0us-gaap_PaymentsToAcquireMineralRights $ 39,000us-gaap_PaymentsToAcquireMineralRights $ 4,116,000us-gaap_PaymentsToAcquireMineralRights                  
Consideration for Ambler property                 29,000,000ncq_ConsiderationForMineralProperty        
Mineral properties expense 2,512,000us-gaap_ExplorationExpenseMining 8,894,000us-gaap_ExplorationExpenseMining 15,327,000us-gaap_ExplorationExpenseMining 53,769,000us-gaap_ExplorationExpenseMining                  
Approximations [Member]                          
Mineral properties expense       53,800,000us-gaap_ExplorationExpenseMining
/ us-gaap_StatementScenarioAxis
= ncq_ApproximationsMember
                 
Ambler Property [Member]                          
Mineral property interest percentage                 100.00%ncq_MineralPropertyRightOwnershipPercentage
/ ncq_MineralPropertyAxis
= ncq_AmblerPropertyMember
    51.00%ncq_MineralPropertyRightOwnershipPercentage
/ ncq_MineralPropertyAxis
= ncq_AmblerPropertyMember
 
Mineral Property, Shares Issued, Shares           931,098ncq_MineralPropertySharesIssuedShares
/ ncq_MineralPropertyAxis
= ncq_AmblerPropertyMember
             
Mineral Property, Shares Issued, Value           5,000,000ncq_MineralPropertySharesIssuedValue
/ ncq_MineralPropertyAxis
= ncq_AmblerPropertyMember
             
Payments for mineral property         12,000,000us-gaap_PaymentsToAcquireMineralRights
/ ncq_MineralPropertyAxis
= ncq_AmblerPropertyMember
               
Consideration for Ambler property                   29,000,000ncq_ConsiderationForMineralProperty
/ ncq_MineralPropertyAxis
= ncq_AmblerPropertyMember
     
Fair value of cash payments to acquire mineral properties         11,100,000ncq_FairValueOfCashPaymentsToAcquireMineralProperties
/ ncq_MineralPropertyAxis
= ncq_AmblerPropertyMember
        10,300,000ncq_FairValueOfCashPaymentsToAcquireMineralProperties
/ ncq_MineralPropertyAxis
= ncq_AmblerPropertyMember
     
Discount rate used         8.00%us-gaap_FairValueInputsDiscountRate
/ ncq_MineralPropertyAxis
= ncq_AmblerPropertyMember
               
Mineral property, fair value of consideration             26,500,000ncq_MineralPropertyFairValueOfConsideration
/ ncq_MineralPropertyAxis
= ncq_AmblerPropertyMember
           
Transaction costs                     100,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ ncq_MineralPropertyAxis
= ncq_AmblerPropertyMember
   
Net smelter return royalty                 1.00%ncq_NetSmelterReturnRoyalty
/ ncq_MineralPropertyAxis
= ncq_AmblerPropertyMember
       
Purchase price of the net smelter royalty                 10,000,000ncq_PurchasePriceOfTheNetSmelterRoyalty
/ ncq_MineralPropertyAxis
= ncq_AmblerPropertyMember
       
Bornite Property [Member]                          
Payments for mineral property               4,000,000us-gaap_PaymentsToAcquireMineralRights
/ ncq_MineralPropertyAxis
= ncq_BornitePropertyMember
         
Net proceeds royalty                         15.00%ncq_NetProceedsRoyalty
/ ncq_MineralPropertyAxis
= ncq_BornitePropertyMember
Discount on consideration                         $ 40,000,000ncq_DiscountOnConsideration
/ ncq_MineralPropertyAxis
= ncq_BornitePropertyMember
Bornite Property [Member] | Minimum [Member]                          
Mineral property interest percentage                         16.00%ncq_MineralPropertyRightOwnershipPercentage
/ ncq_MineralPropertyAxis
= ncq_BornitePropertyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Net smelter return royalty                         1.00%ncq_NetSmelterReturnRoyalty
/ ncq_MineralPropertyAxis
= ncq_BornitePropertyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Bornite Property [Member] | Maximum [Member]                          
Mineral property interest percentage                         25.00%ncq_MineralPropertyRightOwnershipPercentage
/ ncq_MineralPropertyAxis
= ncq_BornitePropertyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Net smelter return royalty                         2.50%ncq_NetSmelterReturnRoyalty
/ ncq_MineralPropertyAxis
= ncq_BornitePropertyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember