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Investment in Ambler Metals LLC - Narrative (Details)	3 Months Ended		6 Months Ended
Investment in Ambler Metals LLC - Narrative (Details)	May 31, 2022 USD ($) shares	May 31, 2021 USD ($)	May 31, 2022 USD ($) Owner shares	May 31, 2021 USD ($)	Feb. 28, 2022 USD ($)	Nov. 30, 2021 USD ($)	Feb. 11, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Joint venture, contributed amount					$ 51,000
Comprehensive loss	$ (4,074,000)	$ (3,413,000)	$ (9,097,000)	$ (7,929,000)
Number of board members \| Owner			2
Ambler Metals LLC
Schedule of Equity Method Investments [Line Items]
Joint venture, contributed amount	51,000		$ 51,000
Contribution made to joint venture	$ 51,000		$ 51,000
Joint venture contribution made in common shares \| shares	31,469		31,469
Percentage of ownership	50.00%		50.00%				50.00%
Comprehensive loss	$ (4,900,000)	$ (3,400,000)	$ (8,700,000)	(5,600,000)
Number of board members \| Owner			4
Maximum exposure to loss	155,700,000		$ 155,700,000
Fair value ascribed to Ambler Metals LLC interest						$ 160,063,000
Loan repayments			2,400,000	1,100,000
Loan repayments, Interest			300,000	$ 1,100,000
Loan repayments, principal			2,100,000
South32 \| Ambler Metals LLC
Schedule of Equity Method Investments [Line Items]
Contribution made to joint venture	$ 51,000		$ 51,000
Percentage of ownership							50.00%
South32
Schedule of Equity Method Investments [Line Items]
Contribution made to joint venture							$ 145,000,000