• December quarter gold sales impacted by isolated negative events
• Annual production guidance revised to 1,600-1,700koz from 1,700-1,850koz
• Lower gold sales across production centres to impact cost performance

Northern Star Resources Ltd (ASX: NST) has provided an operational update for the December 2025 quarter. Total gold sales for the quarter were ~348koz, resulting in 1H FY26 gold sales of ~729koz. Due to the softer operational performance, the company has revised its annual production guidance to 1,600-1,700koz, from 1,700-1,850koz. In addition to previously disclosed events at Jundee and South Kalgoorlie, which collectively impacted production by up to 20koz, the quarter was further affected by several unplanned maintenance and operational challenges. Lower gold sales across each of the three production centres are expected to impact cost performance. For the Kalgoorlie Production Centre, December gold sales totalled ~203koz, with reduced throughput in the processing plant at KCGM due to a primary crusher failure. At the Yandal Production Centre, December gold sales were ~91koz, reflecting weaker performance at both Jundee and Thunderbox. At Pogo, gold sales of ~53koz were affected by lower mined grades due to underground mining dilution. The company will provide the December quarter costs and revised annual cost guidance as part of the quarterly results to be released on Thursday, 22 January 2026.

Annual production guidance revised to 1,600-1,700koz from 1,700-1,850koz for FY26.