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Schedule of NovaGold Arrangement Stock Options Outstanding (Details) - May. 31, 2015 - NovaGold Arrangement Options [Member] - $ / shares
Total
Number of outstanding and exercisable options 546,771
Weighted average years to expiry 1 year 2 months 8 days
Weighted average exercise price $ 5.10
NovaGold Arrangement Range 1 [Member]  
Exercise price lower range limit 2.88
Exercise price upper range limit $ 3.99
Number of outstanding and exercisable options 66,664
Weighted average years to expiry 1 year 4 months 24 days
Weighted average exercise price $ 3.08
NovaGold Arrangement Range 2 [Member]  
Exercise price lower range limit 4.00
Exercise price upper range limit $ 5.99
Number of outstanding and exercisable options 295,071
Weighted average years to expiry 1 year 5 months 8 days
Weighted average exercise price $ 4.84
NovaGold Arrangement Range 3 [Member]  
Exercise price lower range limit 6.00
Exercise price upper range limit $ 7.99
Number of outstanding and exercisable options 185,036
Weighted average years to expiry 8 months 19 days
Weighted average exercise price $ 6.24