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Investment in Ambler Metals LLC - Financial information (Details) - USD ($) $ in Thousands	10 Months Ended	12 Months Ended
	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019	Feb. 11, 2020
The carrying value of investment in Ambler Metals LLC
Share of loss on equity investment		$ (13,082)	$ (2,855)
Investment in Ambler Metals LLC.	$ 173,145	160,063	173,145
Assets [Abstract]
Total assets	185,265	167,305	185,265
Mineral properties		119
Liabilities [Abstract]
Total liabilities	(1,454)	(1,266)	(1,454)
Ambler Metals' net loss
Depreciation		21	91
General and administrative		1,517	1,650	$ 1,838
Professional Fees		818	1,347	1,382
Foreign exchange loss (gain)		36	56	$ (19)
Ambler Metals LLC
Assets [Abstract]
Total assets	171,991	149,374	171,991
Cash	81,673	61,205	81,673
Loan receivable from South32 (current and long-term)	58,478	55,355	58,478
Mineral properties	30,705	30,757	30,705
Liabilities [Abstract]
Total liabilities	(1,496)	(5,043)	(1,496)
Accounts payable and accrued liabilities	(1,445)	(4,148)	(1,445)
Members' equity (Total assets less Total liabilities)	170,495	144,331	170,495
Ambler Metals' net loss
Depreciation	95	77
Corporate salaries and wages	614	2,421
General and administrative	653	756
Lease expense	48	276
Mineral properties expense	3,488	22,639
Professional Fees	1,990	1,047
Foreign exchange loss (gain)	3	6
Interest income	(1,180)	(1,058)
Comprehensive loss	5,711	26,164
Revision of Prior Period, Adjustment [Member]
Ambler Metals' net loss
Mineral properties expense	300
Ambler Metals
The carrying value of investment in Ambler Metals LLC
Investment in Ambler Metals LLC.					$ 176,000
Share of loss on equity investment	(2,855)	(13,082)
Investment in Ambler Metals LLC.	$ 173,145	$ 160,063	$ 173,145

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