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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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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