Great Boulder Resources (ASX: GBR) has announced significant drilling success at its Side Well project, extending mineralisation deeper than its 1Moz resource at Ironbark with high-grade intercepts and identifying coarse gold at Mulga Bill.
The company is leveraging three active rigs and a strong cash position to advance its mineral resource growth strategy.
Drilling intersected 15.32m at 8.85 g/t Au from 125.38m (25IBDD001) and 1.08m at 9.16 g/t Au from 179.24m (25IBDD007).
These results extend mineralisation significantly deeper than the current 1.02Moz resource at the Side Well project.
This success bolsters the potential for substantial resource growth and enhanced strategic development options.
Mulga Bill Coarse Gold
A coarse gold interval was identified between 503.52m–503.77m in hole 25MBRCD002A.
This deep intersection, approximately 200m below previous drilling, supports the large-scale potential of the Mulga Bill – Eaglehawk system.
Assays for this interval are expected in 4–6 weeks, with preliminary visual observations highly encouraging.
Resource Growth Context
The Side Well MRE (December 2025) stands at 16.0 Mt at 2.0 g/t Au for 1.02 Moz.
61% of the ounces are in the Indicated category, with approximately 90% amenable to open-pit mining.
Recent MREs for Eaglehawk, Flagpole, Saltbush, and Golden Bracelet demonstrate open-ended potential along strike and at depth.
Development Outlook
Great Boulder is actively advancing towards development, with mining lease applications planned for 2026.
The company maintains strategic flexibility to develop a stand-alone project or potentially feed nearby mill networks.
Approximately A$15 million in cash supports ongoing drilling and evaluation of strategic options.
Outlook
Great Boulder Resources' latest drilling results at Side Well demonstrate significant potential for resource expansion both deeper and along strike, bolstering confidence in the project's scale and future development prospects.
With active drilling and a solid cash position, the company is well-placed to continue growing its gold inventory and evaluating strategic pathways forward.
