Northern Star Resources (ASX:NST) has lowered its full-year gold production guidance following a softer-than-expected December 2025 quarter.
The miner now forecasts FY26 output of 1.6–1.7 million ounces, down from its previous range of 1.7–1.85 million ounces.
Production was hit by isolated disruptions at the Jundee and South Kalgoorlie operations, reducing output by up to 20,000 ounces in the first half.
Additional operational and maintenance challenges across its sites also weighed on performance.
At Kalgoorlie, a four-week crusher failure disrupted December sales, while Yandal saw delays at Jundee and lower mined grades at Thunderbox.
Pogo’s output was affected by underground mining dilution. Northern Star cautioned that lower gold sales across its three production centres will likely impact cost performance for the year.
At the time of reporting, Northern Star Resources' share price was $23.81.