Brightstar’s 167m Bull Oak gold hit: open-pit geometry and planning notes for engineers
Reviewed by Tom Sullivan

First reported on Australian Mining
30 Second Briefing
Brightstar Resources has intersected 167m at 2.07g/t gold from 104m depth in reverse circulation hole BORC26042 at the Bull Oak deposit, within its Sandstone operations in Western Australia. The interval includes multiple higher-grade zones, notably 10m at 25g/t, supporting Bull Oak’s potential as a substantial open-pit feed source rather than a narrow underground target. For mine planning and geotechnical design, the long, continuous mineralised zone favours bulk open-pit geometry and could justify larger-scale pit optimisation and waste-stripping strategies.
Technical Brief
- Reverse circulation drilling at Bull Oak is being used for resource definition rather than early-stage scouting.
- Hole ID BORC26042 provides downhole control for modelling orebody continuity and true thickness in block models.
- The intercept depth (>100m) implies potential for a relatively deep open-pit shell in optimisation runs.
- Multiple internal high-grade zones enable selective mining scenarios and variable cut-off strategies within a bulk pit.
- Data from this hole will materially influence pit limit, strip ratio and phase design in Whittle-style optimisations.
- Geotechnical domains and slope design will rely on RC chip logging for lithology, alteration and structural fabric.
- Metallurgical testwork from this interval can refine recovery assumptions and processing throughput for Sandstone plant scheduling.
Our Take
Brightstar Resources’ Bull Oak intercept sits alongside the recent 225.7m at 3.11g/t and >500m mineralised tonalite hits at the Two Mile Hill–Shillington system, suggesting the company is steadily building a portfolio of bulk-tonnage style gold positions across its Western Australian assets rather than relying on a single high-grade shoot.
With Sandstone operations already yielding ultra-high-grade 1m hits (751g/t) in earlier drilling, the 167m at 2.07g/t at Bull Oak points to a useful blend of grade and width that could support flexible mine planning, combining selective high-grade stoping with larger-scale bulk extraction if continuity is confirmed.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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