Horizon Copper receives ISS backing for Royal Gold deal

Mr. Erfan Kazemi reports LEADING INDEPENDENT PROXY ADVISORY FIRMS RECOMMEND HORIZON SECURITYHOLDERS VOTE FOR THE PROPOSED PLAN OF ARRANGEMENT WITH ROYAL GOLD Institutional Shareholder Services Inc. and other similar advisory firms have each recommended that Horizon Copper Corp. securityholders vote for the special resolution approving the proposed arrangement with Royal Gold Inc. at the coming special meeting of securityholders scheduled for Thursday, Oct. 9, 2025, at 8 a.m. Vancouver time. In its report, ISS highlighted, "The cash consideration represents a significant 72.4-per-cent premium to the share price on the unaffected date, providing both certain and immediate value." The board of directors of Horizon unanimously recommends that the securityholders vote for the arrangement resolution. Meeting details The meeting is to be held on Oct. 9, 2025, at 8 a.m. Vancouver time, in the Copper boardroom at the company's head office located at Suite 3200, 733 Seymour St., Vancouver, B.C., Canada, V6B 0S6. Please visit Horizon's website for complete details and links to all relevant documents ahead of the meeting. Securityholders are encouraged to read the management information circular of Horizon mailed to securityholders in connection with the meeting in its entirety and vote as soon as possible in accordance with the instructions accompanying the form of proxy or voting instruction form mailed to securityholders together with the circular. The deadline for voting by proxy is 8 a.m. Vancouver time on Oct. 7, 2025. Questions and voting assistance Securityholders who have questions about the meeting or require assistance in voting may contact the company's proxy solicitation agent. Laurel Hill Advisory Group North American toll-free:  1-877-452-7184 Outside of North America:  1-416-304-0211 By e-mail:  [email protected] About Horizon Copper Corp. Horizon Copper is a premier copper company holding a portfolio of unparalleled copper assets, including a 1.66-per-cent net profit interest on the Antamina copper mine, exposure to the Oyu Tolgoi copper mine through a 24-per-cent equity ownership in Entree Resources Ltd. and a 30-per-cent interest in the copper-gold Hod Maden project. We seek Safe Harbor.