Mulga Bill North Drilling Yields 29m at 3.15g/t and 8m at 5.67g/t Gold

Exploration Momentum Builds at Mulga Bill North

Great Boulder Resources (ASX: GBR) has announced the resumption of reverse circulation (RC) drilling at the Mulga Bill North target area, part of its flagship Side Well Gold Project near Meekatharra, Western Australia. This move follows promising high-grade gold intercepts reported late last year, including a standout 29 metres grading 3.15 grams per tonne (g/t) gold from 91 metres depth, and 8 metres at 5.67 g/t from 103 metres.

The Mulga Bill North zone is a key focus for resource definition in 2025, with geological characteristics mirroring the adjacent Mulga Bill area where Great Boulder has already delineated a mineral resource of 568,000 ounces at 2.7 g/t Au. The company anticipates incorporating new drilling results into an updated resource estimate, potentially extending the resource footprint northwards along a highly prospective corridor.

A Corridor with Significant Upside Potential

Geochemical analysis along the 6-kilometre Mulga Bill corridor suggests the presence of a mineralised system centred near a Proterozoic dyke at the northern end of the current resource. If this interpretation holds, the mineralised system could extend up to 9 kilometres north-south, substantially increasing the potential resource base. Great Boulder’s Managing Director, Andrew Paterson, highlighted the open-ended nature of the gold and pathfinder element distribution, underscoring the exploration upside.

With previous drilling defining mineralisation up to 1.5 kilometres north of Mulga Bill, the company is optimistic that the combined Mulga Bill corridor could host over one million ounces of gold, positioning it as one of the most significant deposits in the Meekatharra gold field.

Side Well South and Broader Exploration Plans

Alongside Mulga Bill North, Great Boulder has completed 71 aircore (AC) holes at Side Well South, with assay results expected within weeks. An additional 22 AC holes have targeted repetitions of the Saltbush area, another prospective zone northeast of Mulga Bill. These programs aim to test poorly defined gold trends and parallel mineralised zones, potentially adding further ounces to the project’s inventory.

The company’s systematic approach includes ongoing drilling campaigns designed to refine resource estimates and explore extensions along strike and at depth. The technical team’s focus on the dacitic volcaniclastics contact, a key host for high-grade mineralisation, reflects a strategic targeting of the most prospective geological units.

Strategic Positioning in a Rich Gold Province

Great Boulder’s Side Well Project sits within the prolific Meekatharra-Wydgee Greenstone Belt, a region known for significant gold endowment. The project’s current Mineral Resource Estimate stands at 668,000 ounces at 2.8 g/t Au, with a substantial portion in the indicated category. The company’s exploration success and resource growth potential reinforce its position as a notable player in Western Australia’s gold sector.

With assay turnaround times extending to approximately four weeks, market participants will be watching closely for the next tranche of results. The company’s commitment to delivering consistent news flow through 2025 signals a period of active development and potential value accretion.