Equity method investment - Gain on Derecognition of the UKMP assets upon transfer to the Ambler Metals LLC joint venture (Details) - Ambler Metals LLC - USD ($) $ in Thousands	Nov. 30, 2020	Feb. 11, 2020
Table summarizes the gain on recognition of the UKMP assets upon transfer to the Ambler Metals joint venture
Fair value ascribed to Ambler Metals LLC interest	$ 173,145	$ 176,000
Less: carrying value of contributed /eliminated assets
Mineral properties		(30,631)
Property, plant and equipment		(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