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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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Investment in Ambler Metals LLC - Narrative (Details) $ in Thousands	10 Months Ended	12 Months Ended
	Nov. 30, 2020 USD ($)	Nov. 30, 2020 USD ($) Owner	Feb. 11, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of board members \| Owner		2
Loss on equity investment in Ambler Metals LLC (note 4(b))		$ 2,855
Ambler Metals LLC
Schedule of Equity Method Investments [Line Items]
Percentage of ownership	50.00%	50.00%	50.00%
Number of board members \| Owner		4
Fair value ascribed to Ambler Metals LLC interest			$ 176,000
Loss on equity investment in Ambler Metals LLC (note 4(b))	$ 2,855
Ambler Metals LLC \| Variable Interest Entity, Not Primary Beneficiary
Schedule of Equity Method Investments [Line Items]
Maximum exposure to loss			173,000
Ambler Metals LLC \| Variable Interest Entity, Not Primary Beneficiary \| Service agreement
Schedule of Equity Method Investments [Line Items]
Maximum exposure to loss			$ 114
South32 \| Ambler Metals LLC
Schedule of Equity Method Investments [Line Items]
Percentage of ownership			50.00%
Loss on equity investment in Ambler Metals LLC (note 4(b))	$ 5,700
Upper Kobuk Mineral Projects \| South32 \| Ambler Metals LLC
Schedule of Equity Method Investments [Line Items]
Joint venture, contributed amount			$ 145,000