Great Boulder Resources (ASX:GBR) Eaglehawk drilling reinforces high-grade credentials at Side Well

The latest round of assay results from Great Boulder Resources (ASX:GBR) Side Well Gold Project near Meekatharra reinforces the project’s standing as one of the more promising high-grade gold systems in Western Australia’s Murchison field.

The company’s ongoing reverse circulation (RC) drilling at the Eaglehawk and Ironbark deposits continues to reveal zones of impressive grade and continuity as it moves toward an updated mineral resource estimate.

Highlights

• Eaglehawk assays include 6m at 5.10g/t Au from 162m and 28m at 3.80g/t Au from 176m, with a higher-grade interval of 11m at 7.32g/t Au from 193m in hole 25EHRC033.

• A resample of hole 25EHRC003 returned 6m at 121.07g/t Au from 130m, including 2m at 342.00g/t Au.

• Ironbark drilling defined extensions with results such as 13m at 2.43g/t Au from 121m and 3m at 7.27g/t Au from 119m.

• The program supports the pending maiden resource for Eaglehawk and a resource update for Ironbark.

At Side Well, Great Boulder has already delineated 668,000 ounces grading 2.8g/t gold across its deposits, led by the flagship Mulga Bill lode.

The Eaglehawk and Ironbark results demonstrate the scale and consistency of mineralisation within the same structural corridor, providing confidence that the company’s methodical drilling strategy is paying off.

At Eaglehawk, 15 RC holes totalling 3,108 metres were drilled to refine the geometry of mineralised lodes and underpin an initial resource estimate.

The standout result from hole 25EHRC003, a resample returning 6 metres at 121g/t gold, including a staggering 2 metres at 342g/t, exemplifies the coarse visible gold characteristic of the system.

Such grades compare favourably to those seen at the neighbouring Mulga Bill deposit and underscore the potential for high-grade shoots within the broader Side Well structure.

At Ironbark, 13 RC holes covering 1,726 metres extended the known strike of mineralisation by approximately 180 metres to the south. Although the latest program appears to have closed off the near-surface portion of this southern zone, assays such as 3 metres at 7.27g/t and 13 metres at 2.43g/t gold demonstrate that mineralisation persists at depth, with possible high-grade plunges remaining open.

The company’s Managing Director, Andrew Paterson, said the new assays support the interpretation that Eaglehawk shares similar characteristics with Mulga Bill, strengthening the broader resource potential across Side Well. “The Eaglehawk deposit is continuing to deliver high-grade intersections as we finalise all the data required for an initial resource estimate. Results of 6m at 121g/t reinforce the view that Eaglehawk has the same style and tenor of gold grades as our high-grade Mulga Bill deposit,” he said

The latest phase of work also coincides with Great Boulder’s successful application for up to $180,000 in Exploration Incentive Scheme funding from the Western Australian Government.

This grant will support deep diamond drilling at both Mulga Bill and Eaglehawk, targeting extensions of known mineralisation.

In parallel, the company continues regional aircore drilling around Eaglehawk and Ironbark North to test new geophysical targets, while desktop modelling is underway to update mineralisation wireframes across multiple deposits.

The resource update for the broader Side Well Project remains on track for delivery by year-end, with multiple rigs in operation and government-backed deep drilling about to commence , a reflection of Great Boulder’s disciplined approach to building its resource base and the consistency of results being achieved.

The Eaglehawk assays, in particular, suggest that Side Well may host a network of high-grade shoots that could redefine the project’s overall scale within the Meekatharra district.

Great Boulder’s sustained exploration success across Eaglehawk, Ironbark, and Mulga Bill continues to highlight the depth of potential within the Side Well Project.

As the company compiles data for its maiden Eaglehawk resource and prepares for deep diamond drilling under the Exploration Incentive Scheme, the remainder of 2025 promises a steady flow of material updates.

Within the broader context of Western Australia’s gold sector, Side Well stands out as a technically driven exploration story grounded in consistent execution and an increasingly robust geological model.

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