Premier1 Lithium Identifies New VMS Gold Corridor at Yalgoo with High-Grade Carlisle Hits

• High-grade gold mineralisation extends beyond Wadgingarra resource at Carlisle
• Newly identified VMS corridor links Carlisle, Cumberland, and Olive Queen prospects
• Mt Kersey drilling confirms large magmatic hydrothermal system with low-grade gold
• Follow-up EM/IP geophysics and drilling planned to test VMS trend and resource expansion
• Yalgoo Project now 100% owned by Premier1 Lithium amid growing district interest

Carlisle Drilling Uncovers High-Grade Gold and VMS Signature

Premier1 Lithium (ASX:PLC) has punched through the surface at its Yalgoo Gold Project with drilling results that reveal a new high-grade gold zone at the Carlisle prospect, extending mineralisation beyond the boundaries of the existing Wadgingarra Inferred Mineral Resource. Three reverse circulation holes returned robust intercepts including 14 metres at 0.84 g/t Au and 4 metres at 1.88 g/t Au, with standout assays hitting 5.28 g/t Au over 1 metre. This gold mineralisation is hosted in high-magnesium basalts and is accompanied by a strong volcanogenic massive sulphide (VMS) geochemical signature, marked by pathfinder elements such as bismuth, tellurium, and copper.

What sets Carlisle apart is the recognition of a potential new VMS corridor stretching northwards through the Cumberland and Olive Queen prospects, a trend previously unrecognised but now supported by consistent alteration and multi-element geochemistry. The corridor remains open to the south, presenting a compelling target for relatively low-cost expansion of the Wadgingarra resource. This corridor’s significance is underscored by historical drilling at Cumberland that recorded grades up to 40 g/t Au, although those assays were limited to gold only, necessitating further geochemical work to confirm the genetic link.

Exploration Manager Paul Smith noted that the "coherent gold mineralisation along a NNW trend with a clear VMS pathfinder signature" at Carlisle warrants follow-up geophysical surveys and drilling to delineate the system further. This approach aligns with Premier1’s strategic emphasis on cost-effective exploration to unlock value across its portfolio.

Mt Kersey Confirms Large Hydrothermal System Despite Lower Gold Grades

Meanwhile, the Mt Kersey prospect, east of Wadgingarra, delivered confirmation of a large magmatic hydrothermal system through nine drill holes testing a substantial gold-in-soil anomaly and coincident pathfinder element anomalies over a strike length exceeding one kilometre. Although gold grades were modest, with intercepts such as 10 metres at 0.25 g/t Au and 8 metres at 0.54 g/t Au, the presence of strong bismuth-tellurium anomalies and indications of orogenic alteration in the southern drilling area suggest ongoing prospectivity, particularly to the south and at depth.

Executive Director Simon Phillips highlighted that while Mt Kersey’s gold grades fell short of expectations, the geochemical data points to a "genuinely exciting new opportunity" that merits further assessment. This dovetails with Premier1’s previous announcement of a 3,700-metre drilling campaign at Mt Kersey earlier in the year, aiming to unlock the potential of this preserved hydrothermal system in the Yalgoo district’s prolific greenstone belt.

Strategic Next Steps to Expand Yalgoo’s Resource Footprint

Following these encouraging results, Premier1 plans to deploy ground electromagnetic and induced polarisation (EM/IP) geophysics at Carlisle to pinpoint the core of the interpreted VMS system. This will be complemented by additional reverse circulation drilling along strike and to the south, where the system remains open. At Mt Kersey, ongoing detailed geochemical and alteration data assessments will focus on testing the southern extension of the hydrothermal system.

The integration of the new drilling data into the Wadgingarra Inferred Mineral Resource model is expected to refine and potentially expand the resource at depth and along strike, a process that could materially enhance the project’s valuation. Premier1’s 100% ownership of the 266 km² Yalgoo Gold Project places it in a prime position within a district now attracting heightened attention following recent mergers among major gold producers active nearby.

These developments come as Premier1 prepares to launch its maiden drilling at the Rochefort Gold Prospect, another promising target within its portfolio, building on a series of recent geophysical surveys that have sharpened drill targeting in Western Australia’s Murchison region. The Rochefort program, designed to test a large gold-in-soil anomaly, complements the Yalgoo exploration strategy and underscores the company’s focus on high-impact gold opportunities in prolific greenstone belts.

Premier1’s Yalgoo results, particularly the identification of a new VMS corridor and confirmation of a large hydrothermal system at Mt Kersey, mark a significant step in unlocking the district’s gold potential. As the company advances its exploration programs and integrates new data into resource models, the market will be watching how these early-stage findings translate into resource growth and value creation.

Bottom Line?

Premier1’s discovery of a VMS corridor at Carlisle and large hydrothermal system at Mt Kersey opens multiple avenues for resource expansion, but the economic significance hinges on follow-up drilling and geophysical targeting to define continuity and grade.

Questions in the middle?

• How will follow-up EM/IP geophysics refine the target zones at Carlisle and Mt Kersey?
• Can the VMS corridor linking Carlisle, Cumberland, and Olive Queen deliver a substantial resource upgrade?
• What is the potential for higher-grade gold zones at depth or along strike beyond current drill intercepts?