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Mineral properties and development costs (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended 144 Months Ended
Jan. 11, 2010
Oct. 31, 2011
Oct. 19, 2011
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2016
Mineral properties expense       $ 5,037 $ 4,167 $ 2,512  
Approximations              
Payments for mineral property             $ 93,600
Acquisition costs             30,600
Mineral properties expense             $ 63,000
Bornite Property [Member]              
Payments for mineral property   $ 4,000          
Net proceeds royalty     0.00%        
Discount on consideration     $ 40,000        
Bornite Property [Member] | Minimum [Member]              
Mineral property interest percentage     16.00%        
Net smelter return royalty     1.00%        
Bornite Property [Member] | Maximum [Member]              
Mineral property interest percentage     25.00%        
Net smelter return royalty     2.50%        
Ambler Property [Member]              
Mineral property interest percentage 100.00%            
Mineral property, fair value of consideration $ 26,600            
Net smelter return royalty 1.00%            
Purchase price of the net smelter royalty $ 10,000