• Side Well Gold Project Mineral Resource Estimate updated to 16.0Mt @ 2.0g/t Au for 1.02 million ounces of contained gold
• 61% of ounces in the higher confidence Indicated category and circa 90% of ounces are considered to have potential for open pit mining
• Significant recent drilling intersections indicate enormous upside to this Mineral Resource Estimate

Great Boulder Resources has provided an updated Mineral Resource Estimate (MRE) for its flagship Side Well Gold Project near Meekatharra in Western Australia. The updated MRE includes estimates for the Mulga Bill, Eaglehawk, Flagpole, Ironbark, Saltbush and Golden Bracelet deposits, totalling 16.0Mt @ 2.0g/t Au for 1.02 million ounces of contained gold. This establishes Side Well with a substantial resource inventory in a project with district-scale, multi-kilometre potential. 61% of the ounces are in the higher confidence Indicated category, and circa 90% of the ounces are considered to have potential for open pit mining. Recent high-grade drilling results, including 105m @ 2.41g/t Au at Eaglehawk and the intersection of deep visible gold mineralisation below Mulga Bill, indicate enormous upside to this MRE and provide increased confidence in the multi-million-ounce potential of Side Well. The Company has also grown the Mulga Bill deposit to 642,000oz @ 2.4g/t Au, with a very high-grade component of 441,000oz @ 5.3g/t. Great Boulder will be working to rapidly grow its resource inventory and progress Side Well towards production, with at least 3 rigs recommencing drilling in January 2026.

Great Boulder has not provided any high-importance, price-sensitive forward-looking financial metrics in the announcement.

Great Boulder remains focused on growing the resource base at Side Well and progressing the project towards production. The Company intends to lodge mining lease applications covering Mulga Bill, Eaglehawk and Saltbush in the New Year, while continuing aggressive exploration with at least 3 rigs recommencing drilling in January 2026.