Investment in Ambler Metals LLC - Financial information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2022	May 31, 2021	Feb. 28, 2022	Nov. 30, 2021	Feb. 11, 2020
The carrying value of equity method investment
Joint venture contribution					$ 51
Share of loss on equity investment	$ (2,460)	$ (1,700)	$ (4,370)	$ (2,820)
Investment in Ambler Metals	155,744		155,744			$ 160,063
Assets [Abstract]
Total assets	160,299		160,299			167,305
Mineral properties	0		0			119
Liabilities [Abstract]
Total liabilities	(884)		(884)			(1,266)
Ambler Metals' net loss
General and administrative	338	351	735	762
Professional Fees	192	275	437	504
Foreign exchange loss (gain)	1	40	4	75
Ambler Metals
Assets [Abstract]
Total assets	139,683		139,683			149,374
Cash	52,810		52,810			61,205
Loan receivable from South32 (current and long-term)	53,475		53,475			55,355
Mineral properties	30,757		30,757			30,757
Liabilities [Abstract]
Total liabilities	(3,990)		(3,990)			(5,043)
Accounts payable and accrued liabilities	(3,206)		(3,206)			(4,148)
Members' equity (Total assets less Total liabilities)	135,693		135,693			144,331
Ambler Metals' net loss
Depreciation	22	17	45	33
Corporate salaries and wages	486	692	960	1,209
General and administrative	169	259	401	494
Mineral properties expense	4,367	2,531	7,407	3,970
Professional Fees	205	162	502	460
Foreign exchange loss (gain)	(7)	14	(5)	20
Interest income	(322)	(275)	(570)	(547)
Comprehensive loss	4,920	$ 3,400	8,740	$ 5,639
Ambler Metals LLC
The carrying value of equity method investment
Investment in Ambler Metals						$ 160,063
Joint venture contribution	51		51
Share of loss on equity investment			(4,370)
Investment in Ambler Metals	$ 155,744		$ 155,744				$ 176,000