Equity method investment - Financial information (Details) - USD ($) $ in Thousands	3 Months Ended
Feb. 28, 2021	Feb. 29, 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 three month period ending February 28, 2021	$ (1,120)	$ (178)
February 28, 2021, investment in Ambler Metals LLC.	172,025		$ 173,145
Ambler Metals LLC's Balance Sheet and Comprehensive loss
Total Assets	182,534		185,265
Amortization	17	42
General and administrative expense	401	651
Ambler Metals LLC
The carrying value of Trilogy's 50% investment in Ambler Metals LLC
November 30, 2020, investment in Ambler Metals LLC.			173,145	$ 176,000
Share of loss on equity investment for the three month period ending February 28, 2021	(1,120)
February 28, 2021, investment in Ambler Metals LLC.	172,025			$ 176,000
Ambler Metals LLC's Balance Sheet and Comprehensive loss
Current assets: Cash, deposits and prepaid expenses	79,576		82,226
Non - current assets: Property, equipment and mineral properties	32,038		31,287
Loan receivable from South32	58,747		58,478
Current liabilities: Accounts payable and accrued liabilities	(1,310)		(1,445)
Non - current liabilities: Lease obligation	(795)		(51)
Total Assets	168,256		$ 170,495
Amortization	16	12
Mineral properties expense	1,400	167
General and administrative expense	1,095	219
Interest income	272	43
Comprehensive loss	$ (2,239)	$ (355)

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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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