Equity method investment - Financial information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
May 31, 2021	May 31, 2020	May 31, 2021	May 31, 2020	Nov. 30, 2020	Feb. 11, 2020
The carrying value of Trilogy's 50% investment in Ambler Metals LLC
Share of loss on equity investment for the six-month period ending May 31, 2021	$ (1,700)	$ (561)	$ (2,820)	$ (739)
Investment in Ambler Metals LLC.	170,325		170,325		$ 173,145
Ambler Metals LLC's Balance Sheet and Comprehensive loss
Total Assets	180,093		180,093		185,265
Amortization			104	144
General and administrative expense	306	407	669	998
Ambler Metals LLC
The carrying value of Trilogy's 50% investment in Ambler Metals LLC
Investment in Ambler Metals LLC.					173,145	$ 176,000
Share of loss on equity investment for the six-month period ending May 31, 2021			(2,820)
Investment in Ambler Metals LLC.	170,325		170,325			$ 176,000
Ambler Metals LLC's Balance Sheet and Comprehensive loss
Current assets: Cash, deposits and prepaid expenses	77,156		77,156		82,226
Non - current assets: Property, equipment and mineral properties	32,078		32,078		31,287
Loan receivable from South32	57,959		57,959		58,478
Current liabilities: Accounts payable and accrued liabilities	(1,555)		(1,555)		(1,445)
Non - current liabilities: Lease obligation	(782)		(782)		(51)
Total Assets	164,856		164,856		$ 170,495
Amortization	17	38	33	50
Mineral properties expense	2,570	913	3,970	1,080
General and administrative expense	1,088	685	2,183	904
Interest income	(275)	(514)	(547)	(557)
Comprehensive loss	$ 3,400	$ 1,122	$ 5,639	$ 1,477

Represents cash, deposits and prepaid expenses.

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Represents the accounts payable and accrued liabilities.

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Represents the information pertaining to equity method investment, summarized financial information, loan receivable.

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Represents property, equipment and mineral properties.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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This item represents the aggregate value of each identified investment accounted for under the equity method of accounting based on the quoted market price for those investments in common stock for which a quoted market price is available.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.

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

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The net amount of operating interest income (expense).

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