Summary of significant accounting policies (Policies)

6 Months Ended

May 31, 2025

Summary of significant accounting policies

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 May 31, 2025 and our results of operations and cash flows for the six-month periods ended May 31, 2025 and May 31, 2024. The results of operations for the six-month period ended May 31, 2025 are not necessarily indicative of the results to be expected for the fiscal year ending November 30, 2025.

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, 2024, filed with the U.S. Securities and Exchange Commission (“SEC”) and Canadian securities regulatory authorities on February 14, 2025.

These condensed interim consolidated financial statements were approved by the Company’s Audit Committee on behalf of the Board of Directors for issue on July 9, 2025.

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 LLC (“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.

New accounting pronouncements

New accounting pronouncements

Updates to Reportable Segment Disclosures

In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-07 “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures”.  AUS 2023-07 expands public entities’ segment disclosures by requiring disclosure of significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit or loss and interim disclosures of a reportable segment’s profit or loss and assets.  The standard is effective for the Company’s Annual Report on Form 10-K for the fiscal year ended November 30, 2025, and subsequent interim periods, with early adoption permitted.  The Company is evaluating the impact of the guidance on the consolidated financial statements.

Updates to Income Tax Disclosure

In December 2023, the FASB issued ASU 2023-09 “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” ASU 2023-09 enhances the transparency and decision usefulness of income tax disclosures through changes to the rate reconciliation and income taxes paid information. The standard is effective beginning with the Company’s Annual Report on Form 10-K for the fiscal year ended November 30, 2026, and subsequent interim periods, with early adoption permitted. The Company is evaluating the impact of the guidance on the consolidated financial statements.