• Mineral Resource Estimate has increased by 0.9 Moz of gold and 2.8 Moz of silver
• Total gold production of 2.1 Moz over 13-year mine life
• Post-Tax NPV8 of US$1,023M and IRR of 79% at US$3,000/oz gold & US$30/oz silver

St Barbara Limited has completed the Feasibility Study for the Simberi Expansion Project, which demonstrates that Simberi is a high-quality, long-life, low-cost asset. The Mineral Resource Estimate has increased by 0.9 Moz of gold and 2.8 Moz of silver, with total gold production of 2.1 Moz over the 13-year mine life. The project has a post-tax NPV8 of US$1,023M and an IRR of 79% at a gold price of US$3,000/oz and silver price of US$30/oz. The all-in sustaining cost is expected to decrease to the range of US$1,100 - US$1,400/oz from FY29 to FY36. The initial project capital is estimated at US$275 million, with an additional US$50 million to US$70 million in pre-expansion growth capital. The study shows gold production averaging above 200 kozpa over nine years, at a low operating cost and with a mine life extending to 13 years, without including any mineral resource conversion or exploration targets.

Total gold production of 2.1 Moz over the 13-year mine life, with annual production initially rising to above 200 kozpa from FY29. All-in Sustaining Cost (AISC) decreasing to US$1,100 - US$1,400/oz range from FY29 to FY36.

The key next steps for St Barbara to progress the Simberi Expansion Project include confirming the Mining Lease Extension, continuing with the execution of early works packages and pre-expansion growth capital projects, and finalizing the investment decision based on an updated Life of Mine Plan and construction work program.