• Simberi Mineral Resources (Gold) increased 0.9 Moz to 5.8 Moz
• Inaugural Simberi Ore Resources (Silver) of 15.3 Moz
• Atlantic Mineral Resources (Gold) stable at 2.1 Moz

St Barbara Ltd has released its 31 December 2025 Mineral Resources and Ore Reserves statement, reporting a 1.0 Moz increase in total gold Mineral Resources to 7.9 Moz and the inaugural reporting of 15.3 Moz of silver Mineral Resources at the Simberi Operations. The Simberi Mineral Resources (Gold) increased by 0.9 Moz to 5.8 Moz, driven by Feasibility and Pre-Feasibility Studies completed during the year and revisions to economic assumptions. The Atlantic Mineral Resources (Gold) remained stable at 2.1 Moz. Group Ore Reserves for gold decreased slightly to 3.8 Moz following open pit design changes. The company also reported inaugural Simberi Ore Reserves (Silver) of 4.5 Moz. St Barbara's Mineral Resources and Ore Reserves are subject to robust governance and internal controls, with oversight from the company's Mineral Resources and Ore Reserves Committee.