Summary of significant accounting policies (Policies)	9 Months Ended
Aug. 31, 2024
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation These condensed 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 condensed interim consolidated financial statements include all adjustments necessary for the fair statement of the Company’s financial position as of August 31, 2024 and our results of operations and cash flows for the nine-month periods ended August 31, 2024 and August 31, 2023. The results of operations for the nine-month period ended August 31, 2024 are not necessarily indicative of the results to be expected for the fiscal year ending November 30, 2024. As these condensed interim consolidated financial statements do not contain all of the disclosures required by U.S. GAAP for annual financial statements, these condensed 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 condensed interim consolidated financial statements were approved by the Company’s Audit Committee on behalf of the Board of Directors for issue on October 7, 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 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. Ambler Metals is a non-publicly traded equity investment owning exploration and development projects. Significant judgments are made in assessing the possibility of impairment. The Company assesses whether there has been a potential triggering event for other-than-temporary impairment by assessing the underlying assets of Ambler Metals for recoverability and assessing whether there has been a change in the development plan or strategy for the projects. If the Company concludes there is sufficient evidence for an other-than-temporary impairment, an assessment of fair value is performed. If the underlying assets are not recoverable, the Company will record an impairment charge equal to the difference between the carrying amount of the equity investment and its fair value. This assessment is subjective and requires consideration at each period end.

Summary of significant accounting policies (Policies)

9 Months Ended

Aug. 31, 2024

These condensed 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 condensed interim consolidated financial statements include all adjustments necessary for the fair statement of the Company’s financial position as of August 31, 2024 and our results of operations and cash flows for the nine-month periods ended August 31, 2024 and August 31, 2023. The results of operations for the nine-month period ended August 31, 2024 are not necessarily indicative of the results to be expected for the fiscal year ending November 30, 2024.

As these condensed interim consolidated financial statements do not contain all of the disclosures required by U.S. GAAP for annual financial statements, these condensed 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 condensed interim consolidated financial statements were approved by the Company’s Audit Committee on behalf of the Board of Directors for issue on October 7, 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 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. Ambler Metals is a non-publicly traded equity investment owning exploration and development projects. Significant judgments are made in assessing the possibility of impairment. The Company assesses whether there has been a potential triggering event for other-than-temporary impairment by assessing the underlying assets of Ambler Metals for recoverability and assessing whether there has been a change in the development plan or strategy for the projects. If the Company concludes there is sufficient evidence for an other-than-temporary impairment, an assessment of fair value is performed. If the underlying assets are not recoverable, the Company will record an impairment charge equal to the difference between the carrying amount of the equity investment and its fair value. This assessment is subjective and requires consideration at each period end.