Highlights:

  • At the Doherty and Basin projects, rock chip assays confirm manganese oxide content up to 51.8% Mn.
  • Mineralisation at Basin aligns with host rock fabric, supporting a primary exhalative stratiform model.
  • Sampling continues to define extensive manganese outcrops and boulders.

Great Dirt Resources Limited (ASX:GR8) has reported significant manganese results from ongoing exploration at its 100% owned Doherty and Basin projects in New South Wales. Rock chip sampling from historic workings at Basin (Copper Hill) and Neranghi has confirmed high-grade manganese oxide mineralisation, with assays reaching 51.8% Mn. The announcement coincides with research and development programs using advanced geophysical and structural modelling techniques aimed at understanding the formation of these deposits at depth.

High-Grade Manganese Confirmed

Recent sampling across Basin and Neranghi has identified massive manganese mineralisation in outcrops and boulders up to 70 x 40 x 20 cm. Rock chip assays returned manganese oxide content of up to 51.8% Mn, highlighting the high-grade nature of the mineralisation across both project areas. At Basin (Copper Hill), the manganese appears to follow the fabric of the host chert rock, suggesting a potential primary exhalative stratiform manganese oxide system rather than surface enrichment alone.

Research Program Targets Primary Deposits

Great Dirt Resources is advancing research and development programs to assess whether primary exhalative stratiform manganese oxide deposits exist at depth. Specialist consultants, including Eureka Consulting Pty Ltd, are integrating geochemical assays, geophysical surveys, structural modelling, and drilling data to create a 3D model of the mineralisation within accreted terranes.

Innovative processing techniques and proprietary software filters developed by consultant geophysicist Peter Gidley are being applied to enhance survey data and define new target areas.

Ongoing Exploration and Future Work

The research has successfully identified and ranked several high-priority target zones. Future field work will focus on collecting additional data to test the hypothesis that primary manganese systems exist at depth. This includes further ground sampling, geophysical surveys, and potentially drilling to expand the understanding of mineralisation patterns.

Market Response

Following the release of these exploration results, GR8 shares traded 18% higher at AUD 0.23 per share during trading hours on 5 November 2025.