Summary of significant accounting policies (Policies)	3 Months Ended
Feb. 29, 2024
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation These interim consolidated financial statements have been prepared using accounting principles generally accepted in the United States (“U.S. GAAP”) and include the accounts of Trilogy and its wholly owned subsidiaries, NovaCopper US Inc. (dba “Trilogy Metals US”) and 995 Exploration Inc. All intercompany transactions are eliminated on consolidation. For variable interest entities (“VIEs”) where Trilogy is not the primary beneficiary, we use the equity method of accounting. All figures are in United States dollars unless otherwise noted. References to CDN$ refer to amounts in Canadian dollars. These interim consolidated financial statements include all adjustments necessary for the fair presentation of the Company’s financial position as of February 29, 2024 and our results of operations and cash flows for the three-month period ended February 29, 2024 and February 28, 2023. The results of operations for the three-month period ended February 29, 2024 are not necessarily indicative of the results to be expected for the fiscal year ending November 30, 2024. As these interim consolidated financial statements do not contain all of the disclosures required by U.S. GAAP for annual financial statements, these interim consolidated financial statements should be read in conjunction with the annual financial statements and related notes included in our Annual Report on Form 10-K for the fiscal year ended November 30, 2023, filed with the U.S. Securities and Exchange Commission (“SEC”) and Canadian securities regulatory authorities on February 9, 2024. These interim consolidated financial statements were approved by the Company’s Audit Committee on behalf of the Board of Directors for issue on April 2, 2024.
Use of estimates and measurement uncertainties	Use of estimates and measurement uncertainties The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions of future events that affect the reported amount of assets and liabilities and disclosure of contingent liabilities at the date of the financial statements, and the reported amounts of expenditures during the period. Significant judgments include the assessment of potential indicators of impairment for our equity method investments where key judgement is the delay on the Ambler Access Project is temporary and the delay was considered when assessing indicators of impairment. Significant estimates include the measurement of income taxes, and the valuation of stock-based compensation. Actual results could differ materially from those reported. Management assesses the possibility of impairment in the carrying value of its equity method investment in Ambler Metals whenever events or circumstances indicate that the carrying amount of the investment may not be recoverable. Significant judgments are made in assessing the possibility of impairment. Management considers factors that may be indicative of an impairment include a loss in the value of an investment that is not temporary. Factors consider include but are not limited to, sustained losses by the investment, the absence of the ability to recover the carrying amount of the investment, significant changes in the legal, business or regulatory environment, significant adverse changes impacting the investee and internal reporting indicating the economic performance of an investment is, or will be, worse than expected. These factors are subjective and require consideration at each period end.

Summary of significant accounting policies (Policies)

3 Months Ended

Feb. 29, 2024

These interim consolidated financial statements have been prepared using accounting principles generally accepted in the United States (“U.S. GAAP”) and include the accounts of Trilogy and its wholly owned subsidiaries, NovaCopper US Inc. (dba “Trilogy Metals US”) and 995 Exploration Inc. All intercompany transactions are eliminated on consolidation. For variable interest entities (“VIEs”) where Trilogy is not the primary beneficiary, we use the equity method of accounting.

All figures are in United States dollars unless otherwise noted. References to CDN$ refer to amounts in Canadian dollars.

These interim consolidated financial statements include all adjustments necessary for the fair presentation of the Company’s financial position as of February 29, 2024 and our results of operations and cash flows for the three-month period ended February 29, 2024 and February 28, 2023. The results of operations for the three-month period ended February 29, 2024 are not necessarily indicative of the results to be expected for the fiscal year ending November 30, 2024.

As these interim consolidated financial statements do not contain all of the disclosures required by U.S. GAAP for annual financial statements, these interim consolidated financial statements should be read in conjunction with the annual financial statements and related notes included in our Annual Report on Form 10-K for the fiscal year ended November 30, 2023, filed with the U.S. Securities and Exchange Commission (“SEC”) and Canadian securities regulatory authorities on February 9, 2024.

These interim consolidated financial statements were approved by the Company’s Audit Committee on behalf of the Board of Directors for issue on April 2, 2024.

Use of estimates and measurement uncertainties

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions of future events that affect the reported amount of assets and liabilities and disclosure of contingent liabilities at the date of the financial statements, and the reported amounts of expenditures during the period. Significant judgments include the assessment of potential indicators of impairment for our equity method investments where key judgement is the delay on the Ambler Access Project is temporary and the delay was considered when assessing indicators of impairment. Significant estimates include the measurement of income taxes, and the valuation of stock-based compensation. Actual results could differ materially from those reported.

Management assesses the possibility of impairment in the carrying value of its equity method investment in Ambler Metals whenever events or circumstances indicate that the carrying amount of the investment may not be recoverable. Significant judgments are made in assessing the possibility of impairment. Management considers factors that may be indicative of an impairment include a loss in the value of an investment that is not temporary. Factors consider include but are not limited to, sustained losses by the investment, the absence of the ability to recover the carrying amount of the investment, significant changes in the legal, business or regulatory environment, significant adverse changes impacting the investee and internal reporting indicating the economic performance of an investment is, or will be, worse than expected.

These factors are subjective and require consideration at each period end.