Barton’s Tunkillia PFS: design, pit optimisation and capex notes for mine engineers
Reviewed by Tom Sullivan

First reported on Australian Mining
30 Second Briefing
Barton Gold Holdings has started a pre-feasibility study for its Tunkillia gold project in South Australia, appointing GR Engineering Services as lead engineer for what it targets as a large-scale, high-margin open-pit operation. The PFS follows an updated mineral resource estimate at the 223 Deposit and new drilling that has extended mineralisation along strike and at depth, indicating potential for a larger production footprint. Outcomes will shape process plant design, pit optimisation and infrastructure sizing, directly affecting capital intensity and cut-off grade assumptions.
Technical Brief
- Outcomes are expected to feed directly into a future definitive feasibility study and project financing case.
Our Take
GR Engineering Services has recently been securing multiple gold EPC roles, including Genesis Minerals’ Tower Hill project in Western Australia (24 Feb 2026), which suggests Barton Gold’s Tunkillia study will benefit from a contractor with very current Australian gold plant design and execution experience.
The cluster of recent GR Engineering awards across gold and base metals plants (Davyhurst, Tower Hill, Sulphur Springs) indicates the contractor is operating near full utilisation, so early engagement at Tunkillia could be important for Barton Gold to secure schedule certainty and competitive pricing for any eventual EPC phase.
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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