Coonambula JV Drilling Reveals Open-Ended Antimony Zones, Assays Pending

Strong Visual Mineralisation Validates Exploration Model

Great Divide Mining Limited (ASX – GDM) has received encouraging updates from its joint venture partner Dart Mining NL (ASX – DTM) regarding the ongoing drilling program at the Coonambula Antimony-Gold Project in Central Queensland. Dart Mining has completed over 1,350 metres of diamond drilling at the historic Banshee Prospect, consistently intersecting visually impressive stibnite mineralisation, the primary ore mineral for antimony.

The presence of massive stibnite veins and quartz veining across all drill holes to date confirms the fertility of the Banshee system and supports the hypothesis of a substantial antimony-gold mineralised system. The mineralisation extends along a 300-metre strike length and remains open both laterally and at depth, suggesting further upside potential.

Farm-In Joint Venture Structure Accelerates Exploration

Under the farm-in agreement, Dart Mining has acquired an initial 15% interest in the project and can earn up to 51% by completing defined drilling and reporting milestones over two years. Dart Mining is managing the exploration activities, including drilling with its in-house rig, while Great Divide Mining retains ownership of the tenements and a carried interest during early exploration.

This arrangement allows Dart Mining to rapidly advance the project, focusing on infill drilling to upgrade the resource classification and progressing towards a JORC-compliant Antimony-Gold Resource. The partnership leverages Dart’s operational capabilities and Great Divide’s strategic asset base near established mining infrastructure.

Geological Context and Historical Significance

The Coonambula Project is situated approximately 70 kilometres southeast of Evolution Mining’s Cracow gold mine and 25 kilometres southwest of the Eidsvold goldfield. The Banshee Prospect itself is a historically significant antimony mine that produced high-grade ore intermittently from the late 19th century through to the 1980s.

The mineralisation style is characterised by quartz veins hosting stibnite and associated gold, with geological similarities to other notable antimony-gold deposits in the region. Recent drilling has intersected multiple zones of massive stibnite, quartz veining, and fault-controlled mineralisation, indicating a complex hydrothermal system with potential for significant resource expansion.

Next Steps and Market Implications

Dart Mining plans to continue drilling to infill and extend the known mineralisation zones, supported by geophysical surveys such as induced polarization (IP) to refine target areas. The company aims to develop a detailed 3D geological model and declare a JORC-compliant resource as soon as drill results permit.

For Great Divide Mining, these developments represent a critical step in unlocking value from its Coonambula tenements. The confirmation of extensive antimony mineralisation could position the project as a significant source of this critical metal, which has growing demand in various industrial applications.