• Simberi production and AISC guidance revised for June 2025 Half Year
• Sizer crusher and SAG mill resets improve availability and throughput
• Average mined grade expected to be lower due to missed face positions

St Barbara Limited (ASX: SBM) has provided updated production and cost guidance for its Simberi operation in the June 2025 Half Year. The company states that Simberi did not achieve the targeted face positions in two of the key mining locations, resulting in a lower than anticipated average mined grade expected for the second half of the financial year. Following a comprehensive review, St Barbara has revised its June 2025 Full Year production and AISC guidance for Simberi. Production from Simberi for the June 2025 Half Year is anticipated to be between 32,500 and 42,500 ounces at an AISC of between A$3,400 and A$3,800 per ounce. The Sizer crusher was commissioned successfully, and together with SAG mill resets in January and February, the availability and throughput has lifted substantially. The two new excavators were also commissioned during February, and additional Volvo AH60 articulated trucks have been sourced and are due for arrival from March to further boost mine fleet capacity. However, the average mined grade is expected to be lower than was being targeted as a result of the missed face positions in two of the key mining locations. The revised guidance for Simberi gold production and AISC for FY25 is outlined in the announcement.

Simberi gold production for FY25 is revised to 55,000 - 65,000 ounces (previously 65,000 - 75,000 ounces) at an AISC of A$3,900 - A$4,200 per ounce (previously A$3,200 - A$3,600 per ounce).