Barton Gold Tunkillia assays: early pit design and cash-flow notes for planners
Reviewed by Tom Sullivan

First reported on Australian Mining
30 Second Briefing
Barton Gold has reported new high-grade intersections from resource-upgrade drilling in proposed starter pits at its Tunkillia gold project in South Australia, including 24m at 4.51g/t gold from 47m depth with a 2m interval at 16.7g/t within pit shells slated for the early mining sequence. Additional intercepts such as 11m of mineralisation support potential grade uplift in the near-surface mine schedule. For mine planners and geotechnical teams, the results strengthen the case for optimising initial pit designs and cash-flow modelling around these higher-grade zones.
Technical Brief
- Resource-upgrade drilling is focused specifically within the defined starter-pit shells at Tunkillia.
- High-grade intervals occur from shallow depths, supporting conventional open-pit drill-and-blast access.
- Intersections sit inside existing pit optimisation outlines, not in step-out or greenfield positions.
- Results target early-sequence benches, informing detailed phase design and pushback geometry.
- Grade control strategy will likely prioritise tighter drilling spacing over these high-grade domains.
- Geotechnical logging from the same holes can refine slope design parameters for the starter pits.
- Metallurgical variability testing on these higher-grade zones becomes critical for early plant performance assumptions.
Our Take
The 24m at 4.51g/t from 47m at Tunkillia fits with a run of strong results our database has tracked since Barton Gold’s 39,000m phase 2 campaign there, suggesting the pre-feasibility study work with GR Engineering Services is being underpinned by increasingly robust grade continuity in the optimised pit shell area.
With both Tunkillia and the Challenger gold project in South Australia generating high-grade intercepts in recent months, Barton Gold is building a multi-asset story in a single jurisdiction, which can simplify permitting and infrastructure planning compared with peers spreading growth across multiple states.
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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