Investment in Ambler Metals LLC - Financial information (Details) - USD ($)	3 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Nov. 30, 2021	Feb. 11, 2020
The carrying value of equity method investment
Joint venture contribution	$ 51,000
Share of loss on equity investment	(1,910,000)	$ (1,120,000)
Investment in Ambler Metals	158,204,000		$ 160,063,000
Assets [Abstract]
Total assets	163,895,000		167,305,000
Mineral properties	119,000		119,000
Liabilities [Abstract]
Total liabilities	(945,000)		(1,266,000)
Ambler Metals' net loss
General and administrative	397,000	401,000
Professional Fees	245,000	229,000
Foreign exchange loss (gain)	3,000	35,000
Ambler Metals
The carrying value of equity method investment
Joint venture contribution	51,000
Ambler Metals' net loss
Depreciation	23,000	16,000
Corporate salaries and wages	474,000	517,000
General and administrative	232,000	235,000
Mineral properties expense	3,040,000	1,439,000
Professional Fees	297,000	298,000
Foreign exchange loss (gain)	2,000	6,000
Interest income	(248,000)	(272,000)
Comprehensive loss	3,820,000	$ 2,239,000
Ambler Metals LLC
The carrying value of equity method investment
Investment in Ambler Metals			160,063,000
Joint venture contribution	51,000
Share of loss on equity investment	(1,910,000)
Investment in Ambler Metals	158,204,000			$ 176,000,000
Assets [Abstract]
Total assets	144,127,000		149,374,000
Cash	58,164,000		61,205,000
Loan receivable from South32 (current and long-term)	53,156,000		55,355,000
Mineral properties	30,757,000		30,757,000
Liabilities [Abstract]
Total liabilities	(3,514,000)		(5,043,000)
Accounts payable and accrued liabilities	(2,673,000)		(4,148,000)
Members' equity (Total assets less Total liabilities)	140,613,000		$ 144,331,000
South32 | Ambler Metals
The carrying value of equity method investment
Joint venture contribution	$ 51,000