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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