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Great Boulder Resources (GBR) has obtained assays of up to 4,434 grams per tonne gold at the Mulga Bill deposit within the Side Well project in Western Australia.
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The WA explorer’s spectacular deep drilling hit was intersected some 430 metres below the known resource. Other high-grade assays hauled in included 1.93 metres at 574.39 grams per tonne from 502 metres.
Great Boulder’s MD, Andrew Paterson, said the results show high-grade veins continue at depth. “These spectacular results highlight the huge scope to continue growing the one million ounce resource at Side Well.”
He explained: “The hit of 4434 g/t gold 200m below Mulga Bill is particularly exciting given that this resource extends for 2.5 kilometres along strike.
“Combined with the outstanding hit 90m west of the resource, the implications of these results for the overall resource are clearly significant. We have multiple rigs on site to follow up on these results immediately.”
An assay from the hole 90 metres west of the 642K ounce Mulga Bill resource returned 0.74 metres at 48.30 grams per tonne from 168.6 metres.
Seven diamond holes were drilled into deep targets at Mulga Bill and Eaglehawk between October 2025 and January 2026 for a total of 3,343.31m.
The program, which was co-funded under the Western Australian government’s Exploration Incentive Scheme (EIS), was intended to demonstrate the potential for deep, high-grade vein systems to continue at significant depth beneath the intrusive-related gold system (IRGS), which currently hosts a combined mineral resource estimate of 782,000 ounces between Mulga Bill and Eaglehawk.
Great Boulder is fast-tracking follow-up drilling of the new areas defined by the high-grade hits. The company will also follow up on the recent high-grade intersections below the 122K ounce resource at the Ironbark deposit within Side Well.
Side Well is located within trucking distance of three processing plants and offers an opportunity for quick cash flow.
Great Boulder is fully funded for drilling, with around $12 million in cash today.
GBR is up +9.52%, to 11.5¢ on Monday.
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