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Investment in Ambler Metals LLC - Narrative (Details)	10 Months Ended	12 Months Ended
	Nov. 30, 2020 USD ($)	Nov. 30, 2021 USD ($) Owner	Nov. 30, 2020 USD ($)	Nov. 30, 2019 USD ($)	Feb. 11, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Comprehensive loss		$ (21,660,000)	$ 161,767,000	$ (27,905,000)
Number of board members | Owner		2
Service agreement
Related party transactions - services agreement income
Amount charged for expenses		$ 22,000	900,000
Ambler Metals
Schedule of Equity Method Investments [Line Items]
Percentage of ownership		50.00%			50.00%
Comprehensive loss	$ (5,700,000)	$ (26,200,000)
Number of board members | Owner		4
Maximum exposure to loss		$ 160,100,000
Fair value ascribed to Ambler Metals LLC interest					$ 176,000,000
Related party transactions - services agreement income
Amount charged for expenses		$ 4,000	$ 2,800,000
South32 | Ambler Metals
Schedule of Equity Method Investments [Line Items]
Percentage of ownership					50.00%
Upper Kobuk Mineral Projects | South32 | Ambler Metals
Schedule of Equity Method Investments [Line Items]
Joint venture, contributed amount					$ 145,000,000

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