Ironbark Gold Resource Grows by 180m with High-Grade Hits to 39.5g/t

Exploration Breakthrough at Ironbark

Great Boulder Resources (ASX, GBR) has unveiled compelling results from its recent reverse circulation (RC) and aircore (AC) drilling campaigns at the Side Well Gold Project in Western Australia. The company’s latest assays reveal high-grade gold intersections, including a standout 1 metre interval grading 39.5 grams per tonne (g/t) Au, extending the Ironbark deposit’s known mineralisation 180 metres to the south. This discovery significantly enhances the prospect of expanding the current resource, which stands at approximately 100,000 ounces at 3.3g/t Au.

Implications for Resource Growth and Project Economics

The new drilling results not only confirm the continuity of high-grade lodes beyond the previously defined resource limits but also suggest a thicker and more robust mineralised zone than earlier models indicated. Notably, water monitoring borehole 25IBMB003 intersected 5 metres at 14.61g/t Au near the southern edge of the current pit design, hinting at additional down-dip extensions. These findings come on the heels of a recent scoping study that highlighted Ironbark’s potential as a highly profitable open pit operation, and they bolster expectations for a materially larger resource and reserve base.

Broader Exploration and Development Progress

Beyond Ironbark, AC drilling at Side Well South has identified broad zones of gold mineralisation, with intercepts such as 15 metres at 1.04g/t Au and 19 metres at 0.98g/t Au, supporting plans for further infill drilling to establish an initial resource estimate. The company is accelerating its exploration efforts with a second RC rig mobilising to the Eaglehawk prospect in late August, aiming to test additional regional targets and early-stage opportunities.

Advancing Towards Mining Approvals

Great Boulder is concurrently advancing development work at Ironbark, including environmental studies, hydrogeological assessments, and waste characterisation. These efforts are critical to preparing mining approval documentation and optimizing site layouts. Managing Director Andrew Paterson emphasized the company’s confidence in the deposit’s growing high-grade endowment and the strong economics underpinning the project, signaling a clear pathway towards resource updates and mining license applications.

Strategic Positioning in Western Australia

Situated in the prolific Meekatharra region, the Side Well Gold Project benefits from proximity to established infrastructure and a well-understood geological setting within the Meekatharra-Wydgee Greenstone Belt. Great Boulder’s focused exploration and systematic drilling approach continue to unlock value in this relatively underexplored area, positioning the company well for future growth and development milestones.