Mineral Properties and development costs (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Feb. 29, 2020	Nov. 30, 2019	Nov. 30, 2018
Mineral properties and development costs		$ 30,631
Alaska, USA [Member]
Reimbursable Acquisition Costs	$ (44)
Acquisition costs		44
Mineral properties and development costs	0	30,631	$ 30,587
Assets derecognized	(30,587)
Ambler Properties [Member] | Alaska, USA [Member]
Reimbursable Acquisition Costs	(44)
Acquisition costs		44
Mineral properties and development costs	0	26,631	26,587
Assets derecognized	(26,587)
Bornite Properties [Member] | Alaska, USA [Member]
Reimbursable Acquisition Costs	0
Acquisition costs		0
Mineral properties and development costs	0	$ 4,000	$ 4,000
Assets derecognized	$ (4,000)