G11 Resources Intersects Broad Alteration at Zig Zag Target in Tasmania

Broad Hydrothermal Alteration Confirms Target Validity at Zig Zag

G11 Resources Ltd (ASX:G11) has delivered encouraging early results from its Sedgwick Bluff Project in Tasmania’s Mt Read Volcanic belt, intersecting a substantial 90-metre zone of silica-sericite-pyrite altered rhyolite in its second diamond drill hole (SD2602) at the Zig Zag Controlled-Source Audio-Magnetotelluric (CSAMT) target. The alteration zone, starting at about 1,089 metres downhole and correlating closely with the geophysical anomaly, features pyrite content ranging from weak (3-4%) to very strong (over 50%), signalling a potentially mineralised hydrothermal system.

The drill hole reached a depth of 1,201 metres but only tested the western flank of the target at approximately 600 metres below surface due to site access constraints. Geological modelling suggests the CSAMT anomaly remains open both up-dip towards surface and down-dip beyond the current hole, implying significant unexplored potential.

Electromagnetic Survey and Further Drilling to Refine Exploration

To better delineate sulphide mineralisation associated with the alteration, G11 has commenced a Down Hole Electromagnetic (DHEM) survey on SD2602. The DHEM results, alongside pending assay data for base metals and gold, will guide subsequent drill targeting at Zig Zag. The company’s geologists have already logged the core and dispatched samples to laboratories, although assay results are yet to be released.

Meanwhile, the diamond drill rig has been mobilised to test the Sunrise airborne EM target in the Comstock Valley, located on tenement EL6/2024. This initial 700-metre hole aims to investigate an untested electromagnetic anomaly at a fault intersection near several historic Mt Lyell ore bodies, including Comstock-Lyell and Crown Lyell. After completing this hole, the rig is planned to return to the Zig Zag target for further drilling.

Sedgwick Bluff Project Positioned Near World-Class Mines

The Sedgwick Bluff Project lies adjacent to the Sibanye-Stillwater Mt Lyell copper-gold mine, one of the region’s flagship operations, within a geological setting known for significant base metal and gold mineralisation. The Mt Read Volcanic belt hosts several major mines, including Henty, Rosebery, Hellyer, and Renison Bell, underscoring the district’s rich mineral endowment.

G11’s exploration strategy, utilising advanced geophysical techniques like CSAMT and airborne EM surveys, is designed to target structurally controlled and stratiform mineralisation within Cambrian volcanics and black shales. The recent drilling results at Zig Zag provide a tangible validation of this approach, with the broad alteration zone intersected seen as a positive indicator ahead of assay confirmation.

Historical Exploration and Next Steps

The Sedgwick Bluff area has a long history of exploration by major players including Rio Tinto, BHP, Pasminco, and Mount Lyell Mining, with previous drilling and geophysical surveys identifying various anomalies but no economic mineralisation to date. G11’s current program builds on this foundation with modern targeting and drilling methods.

Looking ahead, G11 plans to continue diamond drilling at both Zig Zag and Sunrise targets, supported by further geophysical surveys including MLEM, IP, gravity, and magnetics, as well as surface geochemical sampling. The company’s next major milestone will be the receipt and interpretation of assay and DHEM results, which will clarify the mineral potential and inform the scale of follow-up exploration.