• MT survey indicates brine body may extend to 1,000m depth, more than double previous drilling
• Lithium grades increase with depth, up to 248 mg/L Li, exceeding current resource grade
• Potential for significant resource growth by targeting deeper, higher-grade portions of brine system

Greenwing Resources Ltd (ASX: GW1) has provided an interpretation of the magnetotelluric (MT) geophysical survey at its San Jorge Lithium Brine Project in Argentina, which indicates the brine body may extend to approximately 1,000m depth, more than double the maximum drilling depth of 402m. The MT survey data, combined with earlier TEM survey results, passive seismic data, and drill hole data, has been used to produce a subsurface model of the brine body. The analysis reveals a large, highly conductive zone interpreted as brine, extending from near surface to approximately 1,000m depth in the western and central portions of the project area. This conductive zone overlies a more resistive unit interpreted as Permian basement rock. Importantly, brine sampling during the initial drilling program demonstrated a consistent trend of increasing lithium concentration with depth, with deeper brine samples returning concentrations of up to 248 mg/L Li, exceeding the current resource grade of 195 mg/L Li. These observations suggest the untested deeper portions of the brine system may host lithium brine at concentrations materially above the current average resource grade, presenting an opportunity to not only expand the resource volume, but to do so at a higher lithium grade. Greenwing's maiden Mineral Resource Estimate of 1.07 Mt LCE at 195 mg/L Li was based on drilling to a maximum of 402m. The new MT survey results indicate the brine system extends to approximately 2.5 times the depth tested by drilling, and that the brine body remains open laterally in multiple directions, supporting the potential for material growth in the resource with further drilling targeting depth extensions and the untested western and northern portions of the brine system.

Greenwing has appointed Zelandez Limited to project manage the scoping study and project advancement program at San Jorge. Zelandez has recommended that the next drilling campaign prioritize testing the deeper brine body at depths beyond the initial 402m, toward the approximately 1,000m extent identified by the MT survey. Drill targeting and program design is underway, incorporating the MT and TEM data to optimize hole placement for both depth and lateral resource extension. The scoping study will evaluate potential development pathways, process flowsheet options, and an initial economic framework, with the MT-defined brine geometry providing the subsurface basis for these assessments.