Galileo Mining Targets Sulphide Zones with New Norseman Drilling Program

Geophysical Surveys Pinpoint Sulphide Targets at Mission Sill

Galileo Mining Ltd (ASX:GAL) has sharpened its exploration focus at the Norseman project after completing detailed gravity and induced polarization (IP) surveys over the Mission Sill prospect. The surveys revealed a pronounced gravity anomaly coinciding with the contact zone between mafic and ultramafic rocks, a setting known to host sulphide mineralisation. This contact zone, exhibiting reduced density due to serpentinisation and weathering, will be the subject of targeted infill aircore drilling designed to locate near-surface mineralisation that could guide the discovery of economic sulphide deposits.

The IP data further supports this strategy, with strong chargeability features detected that may reflect either serpentinisation effects or sulphide mineralisation itself. These geophysical signatures align with recent reverse circulation (RC) drill results confirming sulphide intercepts at shallow depths, reinforcing the prospectivity of the Mission Sill area. However, the precise economic potential of these targets remains to be determined pending upcoming drilling results.

Expanding Callisto South and Regional Prospects

Beyond Mission Sill, Galileo’s interpretation of residual gravity data highlights an extensive strike length, over 20 kilometres, of prospective geological contacts around the Callisto deposit, a 17.5 million tonne resource announced in 2023. The Callisto deposit’s mineralisation style, analogous to South Africa’s Platreef deposits, includes palladium, platinum, gold, nickel, and copper. The company plans first-pass aircore drilling at the Callisto South prospect, a new zone of interest identified from the magnetic imagery and gravity trends.

The upcoming drill program, scheduled to commence in late May 2026, will initially deliver 5,000 metres of drilling across these key targets. This campaign aims to test the continuity and grade of sulphide mineralisation at Mission Sill and extend the understanding of mineralised trends near Callisto. The program follows a series of RC and diamond drilling campaigns that have progressively built the geological model and resource base, including deep diamond drilling beneath Callisto to explore for stacked mineralised lodes. Galileo maintains a robust cash position to support these activities, as detailed in its recent financial updates.

Metallurgical Confidence and Historical Context

Metallurgical test work completed to date provides encouraging signs that the Callisto mineralisation is amenable to conventional crushing, milling, and flotation processing, with reasonable prospects for eventual economic extraction. Recovery assumptions for palladium, platinum, gold, rhodium, nickel, and copper underpin metal equivalent calculations that inform resource valuation and development planning.

Galileo’s tenure at Norseman encompasses 255 square kilometres of mining, exploration, and prospecting licenses, with a history of exploration dating back to the 1960s. Prior work by various parties identified nickel-copper sulphide and cobalt-nickel laterite mineralisation, with Galileo building on this foundation by discovering the Callisto deposit in 2022 and advancing regional prospects such as Mission Sill and Jimberlana. The company’s systematic approach, combining geophysical surveys, geochemical analysis, and drilling, reflects a maturing understanding of the complex layered intrusions that host these mineral systems.

These developments come as Galileo continues to refine its exploration strategy across its portfolio, including its Fraser Range joint venture with the Creasy Group, which targets magmatic nickel-copper sulphide deposits near the Nova mine. The Norseman project remains the company’s flagship asset, with the upcoming drilling campaign poised to provide critical data to assess the scale and grade of mineralisation and inform future resource upgrades.

While no new assay results were released in this update, the integration of geophysical data with historical and recent drilling sets a clear path for the next phase of exploration. The company’s ability to delineate sulphide zones ahead of drilling will be vital in efficiently allocating resources and maximising the potential for discovery in this emerging PGE-nickel-copper province.

Galileo’s strategy and recent findings build on earlier successes, as highlighted by the company’s strong cash balance supporting ongoing exploration and the consistent anomalous PGE zones identified at Mission Sill. These elements underscore the project’s evolving narrative as a significant player in Australia’s critical metals sector.