• Deep diamond drilling at Mulga Bill has intersected coarse visible gold in a brecciated quartz vein from 503.5m
• This hole is a deep step-out hole approximately 200m below previous drilling at Mulga Bill
• The program is intended to test the depth potential of the 3km-long Mulga Bill - Eaglehawk intrusive-related gold system

Great Boulder Resources has intersected coarse visible gold in a deep diamond drill hole at the Mulga Bill prospect, part of the company's flagship Side Well Gold Project. The deep diamond drilling at Mulga Bill (which has a current Mineral Resource Estimate of 568,000oz @ 2.7g/t Au) has intersected the visible gold in a brecciated quartz vein from 503.5m in hole 25MBRCD002A. This vein-hosted intersection sits within a broad zone of silica-sericite alteration with variable disseminated and stringer pyrite. The hole is a deep step-out hole approximately 200m below previous drilling at Mulga Bill, and is the third hole of an eight-hole deep diamond drill program designed to test the large-scale potential of the 3km-long Mulga Bill - Eaglehawk intrusive-related gold system. The company's hypothesis of this large-scale potential has now been confirmed in spectacular fashion. Preliminary assays are expected in January 2026, and the company has secured up to $180,000 in WA Government co-funding for this drilling program. Great Boulder is continuing drilling at the Side Well project, with three rigs working until Christmas, and the company remains on track to report an updated Mineral Resource Estimate for the project later this month.

The company's first deep drilling program at Mulga Bill has intersected a zone of coarse vein-hosted visible gold from 503.44m down-hole, approximately 200m deeper than previous drilling. This confirms the hypothesis of large-scale potential in the 3km-long Mulga Bill - Eaglehawk intrusive-related gold system, and the company is continuing its deep drilling program to further test this potential.