Great Boulder Resources (ASX:GBR) regional drilling demonstrates broader mineralised potential at Side Well

Great Boulder Resources has reported results from a regional air-core drilling program at its flagship Side Well Gold Project near Meekatharra in Western Australia, where the company has defined a Mineral Resource Estimate of 668,000oz at 2.8g/t gold.

The latest drilling has identified several new targets outside existing resource areas, indicating the possibility of an expanded mineralised footprint across multiple structural corridors.

Highlights

• 4m at 11.55g/t Au from 40m in hole 25SWAC286, located approximately 4km north of Ironbark
• Extension of the Eaglehawk deposit by 500m, now exceeding 1.5km of strike
• Pathfinder mineralisation identified between Central and Eastern Corridors
• Deep diamond drilling underway beneath Eaglehawk under a co-funded program

The Phase 1 regional air-core program comprised 119 holes for 8,900m and tested targets generated from induced polarisation geophysical surveys completed earlier in the year.

The drilling focused on three structural corridors: north of Eaglehawk in the Central Corridor, north of Ironbark in the Eastern Corridor, and a third corridor located between the two.

The most notable result was returned from hole 25SWAC286, which intersected 4m at 11.55g/t gold from 40m in a previously untested area with no prior geochemical anomalism, displaying hematite, sericite and silica alteration similar to that observed at Ironbark.

A follow-up hole beneath this intersection encountered the same alteration signature, with assays pending.

The presence of high-grade mineralisation in an untested zone highlights the broader prospectivity of Side Well beyond its defined resources.

Drilling north of Eaglehawk returned encouraging results, including an intersection of 8m at 0.67g/t gold from 56m with a higher-grade interval of 4m at 1.19g/t. These results extend the known strike length of Eaglehawk by approximately 500m, confirming that the Mulga Bill–Eaglehawk gold system remains open to the north.

Importantly, this mineralisation is not included in the forthcoming Eaglehawk Mineral Resource Estimate, providing clear potential for future resource growth as further drilling defines continuity and scale.

In addition, hole 25SWAC226 returned notable pathfinder anomalies, including bismuth up to 116ppm, arsenic up to 137ppm, antimony up to 3.6ppm and tellurium up to 0.84ppm.

These geochemical signatures display characteristics of both Mulga Bill-style intrusive-related mineralisation and Ironbark-style mineralisation.

The significance of this result is heightened by its position within the third structural corridor between the Central and Eastern trends, indicating a potential zone of interaction or overlap between mineralising systems that warrants further investigation.

Great Boulder Resources Managing Director Andrew Paterson said the program has validated the company’s regional targeting approach:

“The first phase of regional air-core drilling tested several prospective areas never previously drilled. The highlight was an intersection of 4m at 11.55g/t Au on a geophysical target about 4km north of Ironbark, which is a very high-grade result for AC drilling. We’ve since drilled follow-up holes around that intersection, with assays expected later in November.”

Deep diamond drilling is now underway at Eaglehawk, with between six and eight holes planned to test high-grade domains and north-plunging shoots interpreted from earlier drilling.

In addition, Phase 2 regional air-core drilling (124 holes for 9,611m) has been completed with assays pending, and Phase 3 drilling has commenced at the Flagpole prospect.

The recent results reinforce Side Well as an emerging multi-corridor mineralised system with several expanding zones of interest.

While further drilling and assay data will be required to determine continuity and scale, the systematic exploration approach has begun to reveal additional structural targets with potential to contribute to future resource growth.

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