Uranium Assays at Yallunda Show 11-27ppm Concentrations, Follow-Up Planned
Lincoln Minerals has confirmed multiple uranium anomalies at its Yallunda Project in South Australia, reinforcing the site's exploration potential. The company plans an expanded exploration program in the second half of 2025 to further define mineralised zones.
- Multiple uranium anomalies detected via soil and rock chip sampling
- Key uranium-vanadium-molybdenum signatures indicate redox-controlled mineralisation
- Anomalies found at Moody Suite granite and Hutchison Group metasediment contacts
- Follow-up exploration planned for H2 2025 including mapping and geophysical surveys
- Historical drilling supports uranium potential despite challenging market conditions
Exploration Update at Yallunda
Lincoln Minerals Limited (ASX: LML) has announced encouraging results from its recent exploration activities at the Yallunda Uranium Project on South Australia's Eyre Peninsula. The company’s latest soil and rock chip sampling program has identified multiple uranium anomalies, expanding on previous survey data and confirming the project's promising uranium potential.
Significant assay results highlight uranium concentrations ranging from 11 to 27 parts per million (ppm) at key lithological boundaries, particularly where Moody Suite granites meet Hutchison Group metasediments. These contacts appear to be critical zones for uranium mobilisation and concentration, driven by geological contrasts and structural controls that facilitate fluid flow and uranium precipitation.
Redox-Controlled Mineralisation Signature
One standout soil sample, YD38, revealed a multi-element anomaly featuring uranium, vanadium, and molybdenum. This combination is characteristic of redox-controlled uranium mineralisation, a process where changes in oxidation state influence uranium deposition. Such a signature underscores the importance of the Moody Suite-Hutchison Group contact as a prime target for further exploration.
Additional anomalies were detected in sandstone and sediments overlying the Miltalie Gneiss, associated with unconformity surfaces, another high-priority target given the known significance of unconformities in uranium deposits worldwide.
Historical Context and Regional Potential
The Yallunda Project area has a history of uranium exploration dating back to the 1980s, with previous drilling by Afmeco Pty Ltd and Centrex Ltd confirming uranium mineralisation near intrusive granite contacts. Lincoln Minerals’ renewed focus builds on this legacy, leveraging modern sampling and assay techniques to refine target zones.
Geologically, the project sits along the Kalinjala Shear Zone, a structural corridor hosting significant magnetite and graphite deposits, and featuring uranium-rich granites proximal to reductants like graphite. These conditions create favourable traps for uranium mineralisation, particularly shear zone-style and unconformity-related deposits.
Next Steps and Market Considerations
Lincoln Minerals plans a comprehensive follow-up exploration program commencing in the second half of 2025. This will include detailed geological mapping, additional geochemical sampling, and geophysical surveys aimed at delineating mineralised zones more precisely.
Despite recent challenges in global uranium market sentiment, the company remains committed to advancing its uranium portfolio and is open to third-party funding discussions to support ongoing exploration and development.
Bottom Line?
Lincoln Minerals’ latest findings at Yallunda set the stage for a pivotal exploration phase amid a cautious uranium market.
Questions in the middle?
- How will Lincoln Minerals prioritise targets within the multiple uranium anomalies identified?
- What impact could global uranium market conditions have on funding and development timelines?
- Could the upcoming geophysical surveys reveal economically viable uranium deposits?
