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    Barton Gold’s Tunkillia upgrade: mine planning and PFS design notes for engineers

    November 12, 2026|

    Reviewed by Joe Ashwell

    Barton Gold’s Tunkillia upgrade: mine planning and PFS design notes for engineers

    First reported on Australian Mining

    30 Second Briefing

    Barton Gold has upgraded almost one million ounces of gold at its Tunkillia project in South Australia into higher-confidence measured and indicated categories, ahead of a pre-feasibility study. The updated mineral resource now totals 1.5 million ounces, including 989,000 ounces in measured and indicated and a further 151,000 ounces recently reclassified into these categories. This de-risks mine planning, pit shell optimisation and geotechnical design for the upcoming PFS, giving engineers firmer parameters for scheduling, strip ratios and processing circuit sizing.

    Technical Brief

    • Resource upgrade is explicitly timed to precede the Tunkillia pre-feasibility study work program.
    • Higher-confidence ounces will directly inform pit shell selection, slope design domains and staging options.
    • Reclassification of ounces reduces reliance on inferred material in early production schedules and cashflow modelling.
    • Improved resource certainty allows tighter constraints on processing plant throughput assumptions and tailings storage sizing.
    • For comparable greenfields gold projects, similar pre-PFS reclassification has typically shortened reserve conversion timelines.

    Our Take

    Across our coverage, Barton Gold’s 2026 activity shows Tunkillia and Challenger in South Australia being advanced in parallel, which suggests the company is building a multi-asset gold platform rather than a single-project story.

    The phase 2 Tunkillia drilling campaign of 39,000m reported in August 2026 underpins the current 1.5Moz resource, indicating that a large proportion of recent metres have gone directly into de-risking starter pits rather than pure step-out exploration.

    Gold is one of the most frequently covered commodities in our Mining database, but South Australian project stories like Tunkillia remain a smaller subset, signalling that Barton Gold is operating in a less crowded regional development space compared with WA or Queensland gold peers.

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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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