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Mineral properties and development costs (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended 159 Months Ended
Apr. 10, 2017
Oct. 19, 2011
Jan. 11, 2010
Oct. 19, 2011
Feb. 28, 2018
Feb. 28, 2017
Nov. 30, 2017
Feb. 28, 2018
Mineral properties expense         $ 1,131 $ 639    
Maximum Subscription Price $ 150,000              
Maintenance Costs 10,000              
Proceeds from Contributions from Affiliates         9,635    
Payments to Acquire Projects $ 5,000              
Approximations                
Payments for mineral property               $ 109,800
Acquisition costs               30,600
Mineral properties expense               $ 79,200
Titiribi Property [Member]                
Proceeds from Contributions from Affiliates         $ 10,000   $ 10,000  
Bornite Property [Member]                
Payments for mineral property   $ 4,000            
Net proceeds royalty       15.00%        
Discount on consideration   $ 40,000   $ 40,000        
Bornite Property [Member] | Minimum [Member]                
Mineral property interest percentage   16.00%   16.00%        
Net smelter return royalty       1.00%        
Bornite Property [Member] | Maximum [Member]                
Mineral property interest percentage   25.00%   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