• Production forecast downgrade due to operational challenges
• Expected impact on annual cost guidance not yet known
• Provided updates on primary crusher failure and carbon-in-leach issues

Northern Star Resources Ltd (NST) has responded to an ASX aware query following its Operational Update released on 2 January 2026. NST has confirmed that the Production Forecast Downgrade and the expected impact on annual cost guidance due to lower gold sales in December are information that a reasonable person would expect to have a material effect on the price or value of its securities. NST also confirmed that the primary crusher failure at KCGM and the Thunderbox Carbon-in-leach failures, which impacted gold sales during the quarter, are also information that a reasonable person would expect to have a material effect. NST first became aware of this information on 1 January 2026, the day after the close of the December quarter, when it received actual operational and production figures. NST did not make any announcement prior to the Operational Update on 2 January 2026 as it did not have the relevant data to assess the actual operational performance and the likely impact on its ability to meet the existing annual production guidance until 1 January 2026. NST has confirmed that it is in compliance with the ASX Listing Rules, including Listing Rule 3.1.