September 2026 Quarterly Activities Report

• KCGM mill tie-in completed, commissioning in early stages
• Gold sold totalled 364koz at an AISC of A$3,217/oz
• Net mine cashflow of A$210 million for the quarter
• FY27 guidance remains unchanged at 1,500-1,650koz gold sold
• Cash and bullion of A$1,200 million at 30 September 2026

Northern Star Resources Ltd (ASX: NST) has reported its operational and financial results for the September 2026 quarter, with gold sold of 363,891oz at an all-in sustaining cost (AISC) of A$3,217/oz. The Kalgoorlie Production Centre sold 193,540oz at an AISC of A$2,919/oz, Yandal sold 117,631oz at an AISC of A$3,687/oz, and Pogo sold 52,720oz at an AISC of US$2,307/oz. The September quarter all-in costs (AIC) of A$4,647/oz were higher than the June quarter reflecting reduced gold sold due to grade and recovery impacts, primarily associated with Pogo and KCGM commissioning activities. Northern Star's FY27 guidance remains unchanged at 1,500-1,650koz gold sold at an AISC of A$3,050-3,450/oz. Cash and bullion of A$1,200 million (at 30 September 2026); A$500 million bank facilities utilised post quarter end to maintain targeted cash on hand. The Hemi Project studies are progressing in line with plan for Final Investment Decision late FY27.

FY27 gold sold 1,500-1,650koz at AISC A$3,050-3,450/oz

The Company's FY27 guidance was announced on 20 August 2026. FY27 Group production is forecast at 1,500-1,650koz of gold sold at an AISC of A$3,050-3,450/oz. Production is expected to be weighted to the second half, reflecting the progressive ramp-up of KCGM's expanded processing facility.