Announcement PDF 30 January 2026 HORIZON GOLD LIMITED ACN: 614 175 923 Suite 8 / 47 Havelock Street, West Perth, WA 6005 | PO Box 39, West Perth, WA 6872 Telephone: +61 8 6331 6092 | Email: info@horizongold.com.au | Website: www.horizongold.com.au 1 Appointment of new Chief Executive Officer and Managing Director Horizon Gold Limited (ASX Code: HRN) (“Horizon” or “Company”) is pleased to announce the appointment of Scott Williamson as Chief Executive Officer and Managing Director of the Company, effective from 2 February 2026. Scott Williamson is a highly experienced Mining Engineer (Western Australian School of Mines) with a Commerce degree (Curtin University). Scott has over 20 years’ experience across technical and corporate roles in the mining sector and equity capital markets. His expertise spans investor relations, management, mining operations, and community engagement across the mining and exploration industries. Scott has a background in operations management with global experience in a variety of commodities, including gold and base metals, having worked in projects across Australia, Africa and Southeast Asia. Scott’s leadership has been a crucial element in the advancement of operations, exploration, sustainable mining practices, and stakeholder and community engagement throughout his various tenures. Scott was most recently the Managing Director of Blackstone Minerals Limited leading the company’s endeavours in Southeast Asia’s premier nickel sulphide district. Prior to Blackstone Minerals, Scott was Investor Relations Manager at Resolute Mining Limited, Resources Analyst at Euroz Hartleys Limited and Technical Services Mining Engineer for Perseus Mining Limited. He currently serves as a non-executive director of Leeuwin Metals Ltd and Corazon Mining Limited, and his resignation from Blackstone Minerals takes effect tomorrow, 31 January 2026. Following Scott’s appointment Mr Leigh Ryan who was the Company’s Managing Director will resign as a director, effective 2 February 2026 and will move to the role of General Manager – Exploration to continue his successful work in advancing the resource base of the Gum Creek Gold Project. Leigh will have held the position of Managing Director from December 2020 to February 2026 and led the significant uplift in ounces to the Gum Creek Gold Project and advancement of the feasibility study. Leigh’s move to General Manager – Exploration and retirement from the Board allows him to concentrate on his true passions of geology, exploration and discovery, and enables him to focus on developing Horizon Gold’s current portfolio of outstanding deposits, along with growing the Gum Creek Gold Project to its highest potential. Leigh’s history with the Company will allow a seamless transition to its new management structure. In addition, Mr Peter Sullivan, currently in the position of Executive Chairman, will revert to the role of Non-executive Chairman. 2 Horizon Chairman Peter Sullivan said in relation to the changes: “We are delighted to have Scott join the Horizon team. His experience makes him ideally suited to lead the next phase of growth for Horizon as we advance the Gum Creek Gold Project to production. We also thank Leigh for his time in charge and look forward to him dedicating his energy to further increasing gold resources on our remarkably prospective tenure.” In accordance with Listing Rule 3.16.4, the terms of Mr Williamson’s Executive Service Agreement are attached as Appendix A. This ASX announcement was authorised for release by the Horizon Board. For further information contact: Peter Sullivan Non-executive Chairman +61 8 6331 6092 3 About the Company Horizon Gold Limited (ASX:HRN) is an exploration company focused on its 100% owned Gum Creek Project in Western Australia. The Gum Creek Gold Project represents an exciting gold exploration and potential development opportunity that currently contains a Mineral Resource Estimate of 37.97Mt @ 1.89g/t Au for 2.30 million ounces of gold1 including Indicated and Inferred resource classifications in accordance with the Australasian Code for Reporting of Identified Mineral Resources and Ore Reserves (JORC Code 2012 edition). The indicated portion of the MRE is 26.72Mt @ 1.90g/t Au for 1.63Moz, representing 71% of the total resource ounces. The Company believes the Gum Creek Gold Project can be a robust, viable stand‐alone mining operation and is continuing work on the Gum Creek Feasibility Study. The Project has significant upside including excellent potential to extend the 10-year Gum Creek Scoping Study mine life through resource expansion drilling and underground mining. Underground mining options and economic evaluation work on the Swan/Swift, Kingfisher, Omega and Wilsons deposits is yet to be completed, and additional drilling at the 12 open pittable resource areas not included in the Scoping or Feasibility Studies will likely increase the resource size of these deposits and elevate them to an economically viable status, further enhancing the positive financial outcomes of the Gum Creek Gold Project. 1 Refer to Horizon Gold Limited ASX Announcement dated 4 November 2025 titled “Gum Creek Project Gold Resource Update” to which the Company confirms there has been no changes. 4 APPENDIX A KEY TERMS OF MR SCOTT WILLIAMSON’S EXECUTIVE SERVICES AGREEMENT Total Fixed Remuneration A salary of $300,000 plus statutory superannuation. Term Indefinite, commencing 2 February 2026. Long Term Incentive The issue of 3,500,000 Performance Rights. The vesting terms of the Performance Rights are outlined in Appendix B. Termination 6 months’ notice of termination required under normal circumstances by both the Company and the executive. 5 APPENDIX B VESTING TERMS OF THE 3,500,000 PERFORMANCE RIGHTS TO BE ISSUED TO MR SCOTT WILLIAMSON Tranche Vesting Milestone No of Performance Rights that vest 1 The Company share price exceeds $1.20 on a 20 consecutive trading day VWAP basis, subject to the Holder’s continued employment of 12 months. 1,000,000 2 The Company share price exceeds $1.60 on a 20 consecutive trading day VWAP basis, subject to the Holder’s continued employment of 24 months. 1,000,000 3 On achieving fully funded Final Investment Decision for development of the Gum Creek Gold project. 1,500,000 All Performance Rights have a term of 5 years. In the event of a Change of Control in the Company, vesting in the first 12 months will be at the Board’s discretion and after this period all Performance Rights will automatically vest.