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    Barton’s Tunkillia drilling: JORC upgrade implications for pit design and PFS teams

    August 7, 2026|

    Reviewed by Joe Ashwell

    Barton’s Tunkillia drilling: JORC upgrade implications for pit design and PFS teams

    First reported on Australian Mining

    30 Second Briefing

    Barton Gold has completed a 39,000m phase 2 drilling campaign at the Tunkillia gold project in South Australia, comprising 38,760m of reverse circulation and diamond drilling across 311 holes over five months. The work targets upgrades to JORC resource classifications ahead of a pre-feasibility study, focusing on better definition of existing mineralisation rather than pure step-out exploration. For mine planners and geotechnical teams, the expanded diamond core dataset should materially improve structural, geometallurgical and rock mass characterisation for pit design and scheduling.

    Technical Brief

    • Additional diamond core will support detailed rock mass classification for slope design and bench height optimisation.
    • Structural logging from oriented core is expected to refine fault geometries controlling orebody continuity and dilution.
    • Expanded assay dataset should tighten variography, allowing shorter search ranges and reduced kriging smoothing in models.
    • Geometallurgical characterisation from core (alteration, sulphides, hardness) will feed into comminution and recovery assumptions.
    • Closer-spaced drilling around existing lodes aims to convert inferred ounces, improving early-year production confidence.
    • For similar Archaean gold systems, such dense infill drilling often reduces strip ratio uncertainty and cutback risk.

    Our Take

    With 311 holes completed over five months at the Tunkillia gold project, Barton Gold is generating the kind of dense dataset typically used to tighten pit-shell geometry and convert a meaningful portion of Inferred ounces to Indicated ahead of pre-feasibility work.

    The recent pre-feasibility study launch at Tunkillia, led by GR Engineering Services, means these JORC upgrades in South Australia are likely to feed directly into plant sizing and mine scheduling assumptions rather than being a purely corporate resource update.

    In our database of gold-focused Mining/Projects coverage, Barton Gold now appears alongside only a handful of Australian juniors running parallel drilling and study programs at multiple assets (Tunkillia and Challenger), which usually signals an intent to build a regional production hub rather than a single-mine play.

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    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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