Cosmo Metals Uncovers High-Grade Antimony Zones up to 10.3% Sb at Bingara

High-Grade Antimony Surfaces at Plunkett & Cassidy

Cosmo Metals Ltd (ASX:CMO) has unveiled compelling surface sampling results from the Antimony Gully Trend within its expansive 484.1 km² Bingara Project in New South Wales. The standout assays come from the Plunkett & Cassidy prospect, where rock chip samples returned antimony grades as high as 10.3% Sb in quartz vein float and 5.37% Sb in quartz breccia. These results are notable given the minimal prior exploration in the area and the presence of parallel mineralised lodes spaced over 100 metres apart, extending more than 1.2 kilometres in strike length with widths exceeding 10 metres.

An 8-Kilometre Mineralised Corridor with Untapped Potential

The Antimony Gully Trend itself stretches over 8 kilometres, tracing a corridor adjacent to the northeast-trending Gineroi Fault zone, a splay of the major Peel Fault. Cosmo’s recent LiDAR survey and ground truthing have identified clusters of historic antimony workings and quartz breccia mineralisation along this trend, particularly at Plunkett & Cassidy and the McManus prospect areas. The company’s Managing Director, Ian Prentice, emphasised the prospectivity of this corridor, noting the potential for multiple parallel shoots and extensions beneath shallow cover, suggesting a sizeable, yet largely untested, mineral system.

Neighbouring World-Class Antimony-Gold Deposits

The significance of Cosmo’s discovery is underscored by its proximity to Larvotto Resources’ Hillgrove Antimony-Gold Mine, a world-class deposit in the same New England Orogen region. The NSW Mines Department has identified this area as having the highest antimony-gold prospectivity in the southern New England Orogen, adding weight to Cosmo’s strategic focus. Elevated arsenic values accompanying the antimony mineralisation further hint at a larger hydrothermal system, with textures suggesting the current outcrop levels represent the upper zones of a potentially richer antimony-gold structure at depth.

Next Steps: Soil Sampling and Target Prioritisation

Building on these encouraging surface results, Cosmo plans to undertake focused soil geochemical sampling using mechanised augers to penetrate areas disturbed by farming. Detailed geological mapping will complement this work to refine and prioritise drill targets. While no drilling has yet been conducted in the Antimony Gully Trend, the company’s approach aims to systematically test the mineralised structures at depth, potentially unlocking a new antimony-gold resource in a region with limited recent exploration.

Exploration in a Historically Underexplored Terrain

The Bingara Project straddles a complex geological boundary marked by the Peel Fault and hosts diverse mineralisation styles, including gold, antimony, and copper. Historical exploration activity has been sporadic, with no drilling in the Antimony Gully area for about 30 years. Cosmo’s integration of modern LiDAR technology with targeted surface sampling represents a fresh push into this underexplored terrain, leveraging high-resolution data to unlock new prospects.