Mineral properties and development costs - Mineral property expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2020	Nov. 30, 2019
Mineral property expense	$ 1,545	$ 19,211
Alaska, USA
Community	137	596
Drilling		5,194
Engineering	723	2,410
Environmental	99	611
Geochemistry and geophysics	12	1,259
Land and permitting	134	744
Project support	249	4,652
Other income		(13)
Wages and benefits	191	3,758
Mineral property expense	$ 1,545	$ 19,211