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Investment in Ambler Metals LLC - Financial information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Nov. 30, 2025
Carrying value of investment in Ambler Metals      
Investment in Ambler Metals, Beginning $ 105,263    
Share of loss on equity investment (1,343) $ (581)  
Investment in Ambler Metals, Ending 106,420    
Assets [Abstract]      
Cash and cash equivalents 47,784   $ 51,613
Total assets 154,542   157,304
Liabilities [Abstract]      
Total liabilities 33,058   33,183
Operating Income (Loss) [Abstract]      
Project costs 1,818    
Corporate costs 873    
Other items (5)    
Comprehensive loss 2,686    
Equity Method Investment, Nonconsolidated Investee or Group of Investees      
Assets [Abstract]      
Cash and cash equivalents 6,167   3,507
Mineral properties 30,899   30,899
Other assets 1,838   1,303
Total assets 38,904   35,709
Liabilities [Abstract]      
Accounts payable and accrued liabilities 1,465   961
Other liabilities 392   16
Total liabilities 1,857   977
Members' equity (total assets less total liabilities) 37,047   $ 34,732
Ambler Metals LLC      
Carrying value of investment in Ambler Metals      
Investment in Ambler Metals, Beginning 105,263    
Joint venture equity contribution 2,500    
Share of loss on equity investment (1,343)    
Investment in Ambler Metals, Ending $ 106,420