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Cautionary Note Regarding Forward-looking Information and Non-IFRS Measures

This website is for information purposes only and shall not constitute an offer to buy, sell, issue or subscribe for, or the solicitation of an offer to buy, sell or issue, or subscribe for any securities. This website is not, nor is it to be construed under any circumstances as a prospectus, a public offering of securities, or an offering memorandum as defined under any applicable securities legislation. The information provided in this website is not intended to be a comprehensive review of all matters and developments concerning Horizon Copper Corp. (“Horizon” or the “Company”). It should be read in conjunction with all other disclosure documents of the Company. The information contained herein is not a substitute for detailed investigation or analysis. No securities commission or regulatory authority has reviewed the accuracy or adequacy of the information presented.

Except for the statements of historical fact contained herein, the information presented constitutes “forward-looking statements”, within the meaning of the Private Securities Litigation Reform Act of 1995and applicable Canadian securities legislation, concerning the business, operations and financial performance and condition of the Company. Forward-looking statements include, but are not limited to,statements relating to the expected timeline to production for the Hod Maden project, the expectation that the Hod Maden project will secure debt financing to fund development and capital costs and the residual amount of equity financing to be provided by the Company, the availability of the Company’s credit facilities, the expected production at Antamina, Hod Maden and Oyu Tolgoi, the operators of the aforementioned mine’s ability to fulfil their roles as operators, including the social and regulatory license to operate, the future price and demand of gold, copper, and other metals, the estimation of mineral reserves and resources, realization of mineral reserve estimates, the timing and amount of estimated future production, the future annual cash flows, development timelines, and enterprise value for the Company and changes to production guidance, as well as those factors discussed in Horizon’s annual report for the financial year ended December 31, 2023 and the Company’s annual information form dated August 1, 2023 available at Forward-looking statements are made based upon certain assumptions and other important factors that, if untrue, could cause the actual results, performances, or achievements of Horizon to be materially different from future results, performances or achievements expressed or implied by such statements. Such statements and information are based on numerous assumptions regarding present and future business strategies and the environment in which Horizon will operate in the future, including, but not limited to, the price and demand of copper and gold and anticipated costs. Certain important factors that could cause actual results, performances or achievements to differ materially from those in the forward looking statements include, amongst others, failure to receive, renew or retain necessary approvals or permits, changes in business plans and strategies, changes in capital expenditures required for project development, market conditions, share price, best use of available cash, gold and other commodity price volatility, discrepancies between actual and estimated production, mineral reserves and resources and metallurgical recoveries, regulatory restrictions, activities by governmental authorities (including changes in taxation), currency fluctuations, the global economic climate, dilution, share price volatility and competition. Forward looking statements are subject to known and unknown risks, uncertainties and other important factors that may cause the actual results, level of activity, performance or achievements of Horizon to be materially different from those expressed or implied by such forward-looking statements, including but not limited to: the impact of general business and economic conditions, the absence of control over mining operations from which Horizon does not directly operate or receive royalties from, and risks related to those mining operations, including risks related to international operations, government and environmental regulation, actual results of current exploration activities, conclusions of economic evaluations and changes in project parameters as plans continue to be refined, risks in the marketability of minerals, fluctuations in the price of copper, gold and other commodities, fluctuation in foreign exchange rates and interest rates, stock market volatility.

Although Horizon has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking statements, there may be other factors that cause results not to be as anticipated, estimated, or intended. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements.

Horizon does not undertake to update any forward-looking statements that are contained or incorporated by reference, except in accordance with applicable securities laws.

Horizon has included certain performance measures in this website. that do not have any standardized meaning prescribed by International Financial Reporting Standards (“IFRS”) including all-in sustaining cost per copper pound on a co-product basis. With respect to the Hod Maden project, the Company presents all-in sustaining cost per copper pound (“AISC”) on a co-product basis as it believes that certain investors use this information to evaluate the Company’s performance in comparison to other companies in the precious metals mining industry that present results on a similar basis. AISC per copper pound on a co-product basis is a non-IFRS financial ratio that uses AISC on a co-product basis, a non-IFRS measure, as a component. AISC per copper pound on a co-product basis is calculated by summing certain costs (operating costs, royalties, treatment, refining & transport costs, sustaining capital, G&A, and other costs) associated with the copper produced. The resulting figure is then divided by the payable copper ounces produced. For Hod Maden, the calculation is as follows: [(Operating Costs ($135 million) + Royalties ($53 million) + Treatment, Refining and Transport Costs ($42 million)+ Sustaining Capital ($23 million) + G&A ($19 million) + Other Costs ($12 million)] / Payable Copper Pounds (255 million pounds) = $1.12/lb Cu AISC].

As there are no standardized methods of calculating these non-IFRS measures, the Company’s approach may differ from those used by others, and accordingly, the use of these measures may not be directly comparable. Accordingly, these Non-IFRS measures are intended to provide additional information and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with International Financial Reporting Standards. Note these figures have not been audited and are subject to change.