Great Boulder Resources (ASX:GBR) sets sights on new gold horizons at Side Well

Great Boulder Resources (ASX:GBR) has unveiled a promising expansion to its flagship Side Well Gold Project near Meekatharra, with a recent induced polarisation (IP) survey identifying multiple new chargeable anomalies across the northern extensions of its key Mulga Bill and Ironbark prospects.

The discoveries could open an entirely new chapter in the project’s growth profile, which already boasts a 668,000-ounce gold resource at an average 2.8 grams per tonne.

The July 2025 pole-dipole survey, spanning 18.3 line kilometres, targeted underexplored ground in both the Central and Eastern Corridors, as well as the area between them.

It successfully mapped chargeability signatures analogous to those associated with mineralisation at Mulga Bill, with one of the standout results being the definition of a new target corridor midway between Mulga Bill and Ironbark.

This zone coincides with a gravity ridge similar to that observed at Mulga Bill, raising the prospect of another mineralised repeat.

Highlights

• Multiple new chargeable anomalies identified north of Mulga Bill and Ironbark

• New conceptual target corridor defined between the two established deposits

• Second aircore rig to be mobilised late August for high-impact greenfields testing

• Ongoing resource definition drilling and development studies at Ironbark

Managing Director Andrew Paterson said the use of IP had again proven effective for mapping the pyrite alteration zone linked to gold mineralisation in the Central Corridor.

“We now have shallow chargeable IP anomalies in several areas which require drill testing, and a second drill rig heading to site in late August. That rig will allow us to accelerate progress on our current programs and also start first-pass drilling on these new targets while we work towards the Side Well resource update,” Paterson said.

The Eaglehawk extension forms another exploration front, where recent aircore drilling has pushed mineralisation to the edge of previous testing.

Beyond this point, drilling is widely spaced and lacks detailed geochemistry, providing fertile ground for discovering “Mulga Bill look-alike” deposits. Pathfinder element bismuth has emerged as a key targeting tool in this corridor.

North of Ironbark, a continuous chargeability feature could be related to regional structural alteration or sulphide-rich stratigraphy. Historical drilling here appears to have missed the main anomaly, leaving gold-in-soil and auger anomalies inadequately tested.

The next phase will see a second aircore rig test the greenfields targets highlighted by the 2025 survey, complementing RC resource definition drilling at Side Well South.

Geotechnical and metallurgical studies for Ironbark are also planned, with the project advancing towards a resource update.

With the new IP data broadening the target pipeline and reinforcing the effectiveness of Great Boulder Resources systematic exploration, the company is positioning Side Well as a large-scale, multi-corridor gold system in one of Western Australia’s most established mining regions.

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