Mineral Properties and development costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2019	Nov. 30, 2020
Mineral properties and development costs, Ending Balance	$ 30,631
Alaska, USA
Mineral properties and development costs, Beginning Balance	30,587
Mineral properties		$ (30,631)
Acquisition costs	44
Mineral properties and development costs, Ending Balance	30,631
Ambler | Alaska, USA
Mineral properties and development costs, Beginning Balance	26,587
Mineral properties		(26,631)
Acquisition costs	44
Mineral properties and development costs, Ending Balance	26,631
Bornite | Alaska, USA
Mineral properties and development costs, Beginning Balance	4,000
Mineral properties		$ (4,000)
Mineral properties and development costs, Ending Balance	$ 4,000