Cauldron Extends Manyingee Uranium Mineralisation by 2.5 Kilometres

Significant Strike Extensions at Manyingee Deposits

Cauldron Energy Limited (ASX:CXU) has reported a substantial expansion of uranium mineralisation at its Manyingee South and Manyingee North deposits, part of the Yanrey Uranium Project in Western Australia. The 2026 drilling campaign has pushed the known mineralisation at Manyingee South approximately 2.5 kilometres upstream beyond the limits of the current Mineral Resource Estimate (MRE) polygon, a notable extension that highlights the deposit’s growth potential.

At Manyingee North, the company’s exploration efforts have extended the mineralised strike length by roughly 2.5 kilometres northwards and an additional 550 metres southwards, further expanding the footprint of the deposit. These step-out drill results confirm that the uranium mineralisation remains open along strike and at depth, reinforcing the prospectivity of the Yanrey palaeochannel system.

Resource Estimates and Drilling Highlights

Manyingee South currently hosts an Inferred Mineral Resource of 21.2 million tonnes at an average grade of 319 ppm eU3O8, containing 14.9 million pounds of uranium oxide at a 100 ppm cutoff. Manyingee North’s maiden Inferred Resource, declared earlier in 2026, stands at 14.9 million tonnes at 297 ppm eU3O8, equating to 9.8 million pounds of uranium oxide. Both deposits are characterised by mineralisation within Early Cretaceous palaeochannels and remain open for expansion.

Key drill intercepts from the recent program include multiple high-grade zones, such as drill hole 26YRAC064 at Manyingee South, which returned 4.56 metres at 346.3 ppm eU3O8 from 75.16 metres, and 26YRAC031 at Manyingee North, with 2.26 metres at 339.2 ppm eU3O8 from 116.09 metres. These results underscore the continuity and robustness of the uranium mineralisation in both deposits.

Passive Seismic Survey Unlocks New Targets

Complementing the drilling, Cauldron’s passive seismic survey program has been instrumental in defining the buried palaeochannels that host the uranium mineralisation. The surveys have identified more than 30 palaeochannels across the Yanrey Project tenure, many of which have yet to be tested by drilling. This geophysical work is guiding the company’s exploration strategy, enabling focused targeting of new prospective zones within the extensive Early Cretaceous coastal plain.

The Manyingee palaeochannel system itself is part of a broader uranium province stretching over 150 kilometres, linking deposits such as Bennet Well and Spinifex Well. Cauldron’s tenure covers approximately 80 kilometres of this trend, positioning it well to consolidate a significant uranium resource base.

Heritage Clearance and Regulatory Context

Cauldron has recently completed a second heritage clearance this year, facilitating ongoing drilling at Manyingee South and Manyingee North and enabling exploration of newly identified targets. These clearances are crucial for advancing the drilling program and expanding resource definition.

CEO Jonathan Fisher emphasised the company’s dual focus on resource growth and regulatory advocacy, stating that while the technical progress at Yanrey is encouraging, lifting Western Australia’s uranium mining ban remains a key strategic priority. Fisher pointed to recent political developments as indicative of a shifting sentiment, suggesting that unlocking uranium mining could bring value to the state and its residents.

Next Steps and Market Implications

Cauldron plans to update its Mineral Resource Estimates for Manyingee South and Manyingee North in due course, reflecting the expanded strike extents and drilling results. The company’s ongoing exploration, supported by passive seismic data and heritage clearances, positions it to further delineate and potentially grow its uranium inventory.

With a combined resource base exceeding 55 million pounds of uranium oxide across its Yanrey deposits, Cauldron is steadily building a significant uranium portfolio in a globally strategic jurisdiction. However, the timing and impact of regulatory changes in Western Australia will remain a critical factor in realising the project’s full value.