Birksgate Drilling Yields 26m at 0.14% Copper with Gold and Molybdenum

Birksgate Drilling Program and Results

Havilah Resources Limited has released assay results from an 11-hole, 2,240-metre reverse circulation drilling campaign at its Birksgate prospect, located roughly 50 kilometres north-northwest of the Kalkaroo copper-gold deposit in South Australia's Curnamona Province. Conducted in late 2025, the program aimed to test conceptual targets within the Birksgate anticline, a geological fold structure known to host copper mineralisation.

Notably, drillholes BKRC013 and BKRC014 on the eastern limb of the anticline intersected significant copper mineralisation within the K2 prospective horizon, a stratigraphic unit interpreted to be equivalent to the host rocks at Kalkaroo. Highlights include 26 metres at 0.14% copper with associated gold up to 1.32 ppm and molybdenum concentrations reaching 617 ppm. These results confirm that the mineralised skarn horizon extends approximately 6 kilometres east of the original Birksgate discovery made in 2014.

Geological Significance and Mineralisation Style

The copper mineralisation at Birksgate is stratabound and structurally controlled, occurring within a distinctive rock package characterised by thinly bedded carbonate and graphitic layers replaced by sulphide minerals, magnetite, and fluorite. This skarn-style mineralisation is typically formed by hydrothermal fluids interacting with carbonate-rich rocks, often linked to nearby intrusive bodies. Elevated manganese and iron levels detected in some drillholes suggest the presence of a distal skarn system, adding complexity and potential to the prospect.

Exploration Implications and Next Steps

Dr Chris Giles, Havilah’s Technical Director, emphasised the significance of confirming widespread copper mineralisation over a lateral distance of about 6 kilometres across the regional syncline and anticline pair. The aeromagnetic data interpretation suggests the prospective horizon extends over 50 kilometres, indicating a substantial untested target area. The key challenge ahead lies in identifying structurally favourable zones where disseminated copper mineralisation could concentrate into higher-grade deposits.

While some drillholes on the western limb did not encounter significant mineralisation, the encouraging geology warrants further investigation. Additional drilling is anticipated, subject to budget and rig availability, to explore strike and depth extensions and to delineate potential resources.

Context Within Regional Exploration

Birksgate has been a focus of exploration since its discovery by the MMG-Havilah joint venture in 2014. Subsequent drilling in 2023 and now in late 2025 has progressively expanded the known mineralised footprint. The consistent geochemical signatures of copper, gold, molybdenum, uranium, and vanadium across multiple drillholes reinforce the prospect’s potential as a significant stratabound skarn deposit within the Curnamona Province.

Havilah’s methodical approach, including rigorous sampling, assaying, and geological logging, provides confidence in the data quality underpinning these interpretations. However, the company cautions that further work is required to confirm the extent and economic viability of the mineralisation.