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Investment in Ambler Metals LLC - UKMP assets upon transfer to the Ambler Metals joint venture (Details) - USD ($)
$ in Thousands
Nov. 30, 2020
Feb. 11, 2020
Alaska, USA    
Less: carrying value of contributed /eliminated assets    
Mineral properties $ (30,631)  
Ambler Metals    
UKMP assets upon transfer to the Ambler Metals joint venture    
Fair value ascribed to Ambler Metals LLC interest   $ 176,000
Less: carrying value of contributed /eliminated assets    
Mineral properties   (30,631)
Property, plant and equipment located in Alaska   (618)
Elimination of Fairbanks warehouse right of use asset   (93)
Elimination of prepaid State of Alaska mining claim fees   (303)
Add:    
Reimbursement of claims staking   44
Demobilization costs of drills   278
Cancellation of Fairbanks warehouse lease liability   93
Fair value of mineral properties purchase option   31,000
Gain on derecognition   $ 175,770