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Equity method investment (Details) - USD ($) $ in Thousands		6 Months Ended
Equity method investment (Details) - USD ($) $ in Thousands	Feb. 11, 2020	May 31, 2020	Feb. 10, 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		$ 175,261
Less: carrying value of contributed /eliminated assets
Property, plant and equipment		(618)
Add:
Gain on derecognition		175,770
Ambler Metals LLC
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	$ 176,000	175,261	$ 176,000
Less: carrying value of contributed /eliminated assets
Mineral properties	(30,587)
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:
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
South32
Schedule of Equity Method Investments [Line Items]
Equity method investment service agreement		668,000
South32 \| Ambler Metals LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment fair value		$ 176,000
Upper Kobuk Mineral Projects \| South32
Schedule of Equity Method Investments [Line Items]
Percentage of ownership	50.00%
Upper Kobuk Mineral Projects \| South32 \| Ambler Metals LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment contribution	$ 145,000