Brightstar’s Two Mile Hill resource doubles: mine design implications for engineers
Reviewed by Joe Ashwell

First reported on Australian Mining
30 Second Briefing
Brightstar Resources has nearly doubled the mineral resource estimate at its Two Mile Hill–Shillington deposit in Western Australia to 24.6Mt at 1.8g/t for 1.45Moz of gold, as part of ongoing mining studies for the Sandstone gold project. The revised MRE, covering both the tonalite-hosted Two Mile Hill intrusion and the adjacent Shillington shear-hosted mineralisation, materially upgrades the scale of potential open pit and underground options. Geotechnical and mine design teams will now be able to re-optimise pit shells, underground stoping layouts and scheduling around the larger, higher-confidence inventory.
Technical Brief
- Updated inventory allows re-cut of economic pit shells and underground stope envelopes at Sandstone.
- Larger resource base supports reassessment of plant throughput, haulage fleet sizing and tailings storage capacity.
- Mine scheduling can now test higher cut-off scenarios to front-load grade without sterilising tonnage.
- Geotechnical domains for tonalite intrusion vs shear-hosted zones can be separated in slope and support design.
- Underground options gain flexibility for larger panel stopes, longer strike drives and fewer access crosscuts.
- Revised MRE underpins refreshed Ore Reserve conversion studies, including updated metallurgical recovery assumptions.
- Capital allocation for pre-strip, decline development and ventilation infrastructure can be re-optimised against the bigger inventory.
Our Take
The new 1.45Moz at 1.8g/t for Two Mile Hill–Shillington aligns with the earlier long intercepts reported on 3 and 27 August 2026, suggesting that broad, consistent mineralisation rather than narrow high-grade shoots is underpinning the doubled resource base at the Sandstone gold project.
Brightstar Resources’ recent acquisition of the Mikado exploration licences around its Laverton processing plant (15 September 2026) indicates a strategy of building a regional gold hub in Western Australia, with Sandstone’s enlarged Two Mile Hill–Shillington inventory likely to be a key feed source option in that plan.
Within our Mining coverage, Western Australian gold projects like Sandstone that can demonstrate >1Moz at grades around 1.5–2g/t are typically viewed as viable for large-scale open pit or bulk underground scenarios, which may influence how Brightstar frames future scoping and development studies for this deposit.
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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