Investment in Ambler Metals LLC - Financial information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 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	$ (8,925)	$ (6,072)	$ (13,295)	$ (8,892)
Investment in Ambler Metals	146,819		146,819			$ 160,063
Assets [Abstract]
Total assets	150,825		150,825			167,305
Mineral properties	0		0			119
Liabilities [Abstract]
Total liabilities	(777)		(777)			(1,266)
Ambler Metals' loss
General and administrative	279	425	1,014	1,188
Professional Fees	131	123	568	627
Foreign exchange loss (gain)	(11)	(31)	(7)	44
Ambler Metals
Assets [Abstract]
Total assets	126,360		126,360			149,374
Cash	93,532		93,532			61,205
Loan receivable from South32 (current and long-term)						55,355
Mineral properties	30,899		30,899			30,757
Liabilities [Abstract]
Total liabilities	(8,517)		(8,517)			(5,043)
Accounts payable and accrued liabilities	(7,789)		(7,789)			(4,148)
Members' equity (Total assets less Total liabilities)	117,843		117,843			144,331
Ambler Metals' loss
Depreciation	32	22	77	55
Corporate salaries and wages	477	655	1,437	1,864
General and administrative	158	397	560	767
Mineral properties expense	17,120	11,139	24,527	15,109
Professional Fees	125	207	626	791
Foreign exchange loss (gain)	10	(16)	5	4
Interest income	(72)	(260)	(642)	(807)
Comprehensive loss	17,850	$ 12,144	26,590	$ 17,783
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			(13,295)
Investment in Ambler Metals	$ 146,819		$ 146,819				$ 176,000