Barton Gold Holdings Limited (ASX:BGD): What Changed in Tunkillia’s Resource Confidence?

Aditi Sarkar

11 November 2026 08:00 PM AEDT

Barton Gold Holdings Limited (ASX:BGD): What Changed in Tunkillia’s Resource Confidence?

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Highlights

Tunkillia’s updated JORC 2012 gold resource is 59.5 million tonnes at 0.78 g/t, or 1.5 million ounces.
Measured and Indicated gold resources total approximately 989,000 ounces.
The Measured category now includes approximately 151,000 ounces.
A pre-feasibility study and silver resource work are targeted for early 2027.

Barton Gold Holdings Limited (ASX:BGD) is a South Australian gold explorer and developer with a portfolio that includes the Tunkillia project in the Gawler Craton. Its November 2026 mineral resource update focused on confidence and geological classification as well as total contained metal. The revised estimate introduces Measured gold ounces at Tunkillia, while feasibility work and potential reserve conversion remain outstanding.

Resource Estimate and Classification

The updated Tunkillia JORC 2012 gold estimate contains 59.5 million tonnes at an average grade of 0.78 grams per tonne, representing approximately 1.5 million ounces. Of these, 989,000 ounces fall within Measured and Indicated categories, including 151,000 ounces reported as Measured. The remainder is classified as Inferred, indicating a lower level of confidence.

Barton Gold Holdings Limited (ASX:BGD) incorporated 57,653 metres of reverse circulation and diamond infill drilling into its revision. The higher-confidence categories are relevant to the next stage of engineering and potential reserve evaluation, but mineral resources are not the same as economically demonstrated ore reserves. Additional technical work is required before a Mining inventory can be established.

Changes Within the Study Pit Shells

Within the pit shells used for the company's optimised scoping study, Measured and Indicated gold increased from 724,000 ounces to 822,000 ounces, an increase of 14%. Total contained gold in those shells changed from approximately 1.035 million ounces to 1.011 million ounces, a reduction of around 2%. Average grade moved from 0.82 to 0.83 grams per tonne.

Barton Gold Holdings Limited (ASX:BGD) used a revised pit-shell constraint in preparing the estimate. Its updated model applies a Revenue Factor of 2.0 to a base gold assumption of AUD 3,500 per ounce. These are resource modelling parameters and do not represent realised sales or a forecast market price. Sensitivity to technical assumptions remains relevant to subsequent studies.

Silver Resource and Drilling Context

The Tunkillia update also reports an Inferred silver mineral resource of approximately 2.759 million ounces within 31.6 million tonnes grading 2.71 grams per tonne. As a subset of the gold mineralisation, this estimate should not be treated as an independently proven commercial by-product stream. Barton Gold Holdings Limited (ASX:BGD) expects further resampling and silver resource assessment during the first quarter of calendar 2027.

Separately, 6.2 million tonnes of Indicated gold-bearing material containing approximately 131,000 ounces sits outside the scoping-study pit shells. Its position outside the earlier design may inform future study options, but inclusion in a development plan would require further mining, economic and permitting assessment. The geological classification does not determine recoveries or margins by itself.

Pre-feasibility Plans and Remaining Risks

Barton Gold Holdings Limited (ASX:BGD) is targeting completion of the Tunkillia pre-feasibility study in the first quarter of 2027. That programme is expected to consider the revised geological information alongside mining and process design. The company has also identified further drilling, resource work and mine-lease related preparations as part of its development pathway.

Project outcomes remain exposed to grade variability, recovery performance, Capital and operating costs, and approvals. The presence of Measured ounces improves geological confidence but does not eliminate those risks. Resource estimates also depend on cut-off grades and other assumptions. Any future reserve declaration would require a separate qualified assessment of modifying factors.

Key Insights

Barton Gold Holdings Limited (ASX:BGD) has updated Tunkillia's resource classifications, adding Measured ounces while retaining a total gold estimate of about 1.5 million ounces. The near-term focus shifts to the pre-feasibility study, silver resource review and the technical work required to translate a mineral resource into a practical development case.

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