Brightstar Hits 7m at 119g/t Gold at Bull Oak Deposit

Spectacular High-Grade Gold Intercept at Bull Oak

Brightstar Resources (ASX:BTR) has reported a stunning 7-metre intercept grading 119 grams per tonne gold from 199 metres downhole at its Bull Oak deposit, part of the Sandstone Gold Project in Western Australia. This includes an extraordinary 1 metre at 751g/t Au, marking the highest single assay the company has recorded at Sandstone to date. These results come from a recent reverse circulation and diamond drilling campaign designed to upgrade the deposit’s Mineral Resource classification from Inferred to Indicated ahead of a Pre-Feasibility Study (PFS) targeted for release before the end of 2026.

Resource Growth and Geological Parallels

The Bull Oak deposit currently holds a Mineral Resource Estimate (MRE) of 10.5 million tonnes at 1.0g/t gold for 322,000 ounces. Since Brightstar acquired Bull Oak, the resource has expanded approximately fourfold, underscoring the deposit’s growing significance within the Sandstone portfolio. Bull Oak shares a geological setting with the nearby Two Mile Hill deposit, featuring gold mineralisation hosted within a felsic granodiorite intrusion intersected by sheeted quartz veins. The similarity has encouraged Brightstar to prioritise this deposit type in its exploration strategy, with further drilling planned to test nearby analogues.

Broader Drilling Success and Project Advancement

Alongside Bull Oak, drilling at the Havilah deposit has also returned encouraging high-grade results, including 4 metres at 11.1g/t Au from shallow depths. Sandstone drilling remains active with three rigs, two reverse circulation and one diamond core, working to expand and upgrade resources. The ongoing work feeds into the landmark Sandstone PFS, which aims to define a significant open pit mining operation leveraging the project’s substantial 2.9 million ounce gold resource at an average grade of 1.3g/t.

Strategic Implications for Brightstar’s Growth

Brightstar’s Managing Director Alex Rovira highlighted the importance of these results in bolstering the company’s development pathway. The exceptional grades at Bull Oak, combined with geological continuity to Two Mile Hill, provide a strong foundation for resource conversion and mine planning. The company is advancing multiple workstreams for the Sandstone PFS, with metallurgical and geotechnical data being collected alongside the drilling. Brightstar aims to integrate these findings to underpin a robust feasibility study and position Sandstone as a key growth pillar alongside its Goldfields Project, which is progressing construction toward first gold in mid-2027.

Outstanding Assay Results Highlight Exploration Upside

The drilling campaign delivered multiple high-grade intervals beyond the headline intercept, such as 21m at 3.83g/t Au and 5m at 8.22g/t Au within the granodiorite, plus significant mineralisation in adjacent basalt and banded iron formation units. Notably, broad zones of lower-grade mineralisation extend over hundreds of metres, supporting the potential for large-scale open pit development. These results reinforce the opportunity to materially increase the Indicated resource component and enhance the project’s economic profile.