Great Boulder Strikes Deep High-Grade Gold at Side Well Project

Extending the Depths of Side Well

Great Boulder Resources (ASX, GBR) has announced a significant breakthrough at its flagship Side Well Gold Project near Meekatharra in Western Australia. Recent diamond drilling at the Ironbark deposit has intersected the deepest high-grade gold mineralisation recorded to date, extending known resources well below the existing 1 million ounce (Moz) gold inventory.

The standout result comes from drill hole 25IBDD007, which returned 1.08 metres at 9.16 grams per tonne (g/t) gold from 179.24 metres downhole, including a higher-grade 0.36 metres at 16.25 g/t. This surpasses previous depth records at Ironbark and suggests continuity of high-grade mineralisation beneath the current 122,000-ounce resource.

Complementary Success at Mulga Bill and Flagpole

This deep extension follows a spectacular coarse gold zone recently reported at the Mulga Bill deposit, where assays are pending for a coarse gold intersection at over 500 metres depth. Additionally, air-core drilling at the Flagpole Corridor, located approximately 3 kilometres south of Mulga Bill, has delivered encouraging results including 4 metres at 16.55 g/t gold and 15 metres at 2.20 g/t gold, highlighting strong potential for resource growth along strike.

These results reinforce Great Boulder’s view that Side Well hosts a robust and high-quality mineralised system with significant upside potential both at depth and along strike. The company is currently operating three drilling rigs targeting rapid resource expansion across multiple deposits within the project.

Strategic Positioning and Future Development

Side Well’s 1.02Moz gold resource is strategically located in the Murchison goldfield, close to existing mining infrastructure and mills operated by neighbouring companies. Managing Director Andrew Paterson emphasised the flexibility this provides, stating that the project could either develop as a standalone mine or supply ore to nearby processing facilities, offering multiple pathways to value creation for shareholders.

Alongside drilling, Great Boulder is advancing geotechnical and metallurgical programs to better understand mining conditions and gold recovery characteristics. Early metallurgical tests on Mulga Bill mineralisation have shown excellent gravity and cyanide leach recoveries, supporting the project’s economic potential.

Ongoing Exploration and Community Engagement

The company has established a dedicated core processing yard in Meekatharra to manage the increasing volume of diamond core samples and expedite assay turnaround. Furthermore, Great Boulder is actively progressing negotiations with the Yugunga Nya mining committee to secure mining agreements, a critical step towards project development.

With multiple rigs drilling and assays pending from recent holes, Great Boulder expects to provide further updates on resource growth at Side Well in the near term, maintaining strong momentum in this promising gold province.