Cauldron Energy Extends Uranium Mineralisation 2,500m at Both Manyingee Deposits
Key Takeaways
- Drilling at Manyingee South has extended uranium mineralisation approximately 2,500m upstream beyond the 2026 MRE polygon, with passive seismic data indicating the palaeochannel continues at least a further 2km southeast.
- Manyingee North mineralisation has been extended 2,500m northwards beyond the 2025 MRE polygon, with drilling stopped only by the limit of heritage clearance — not the limit of mineralisation.
- 36 of 42 holes drilled at Manyingee North this year intersected mineralisation above cut-off grade, a hit rate that validates the deposit's continuity across the extended strike length.
- MRE updates for both Manyingee North and Manyingee South are flagged as forthcoming, making the current 55.6 Mlbs total resource across three deposits a floor rather than a ceiling.
- Cauldron has identified over 30 palaeochannels across its tenements — most untested — against an exploration target of 269 Mlbs, dwarfing the current MRE and signalling the scale of systematic resource growth still ahead.
Mineralisation extended 2,500m at both Manyingee deposits as 2026 drill program delivers
Cauldron Energy (ASX: CXU) has received results from 19 drillholes at Manyingee South extending uranium mineralisation approximately 2,500m upstream beyond the existing Mineral Resource Estimate (MRE) polygon, while a further 21 drillholes at Manyingee North confirm that mineralisation continues north to the limit of current heritage clearance. MRE updates for both deposits are flagged as forthcoming, adding to a total resource base that now stands at 55.6 Mlbs of uranium oxide across three deposits at the Yanrey Uranium Project.
2026 program by the numbers
- 70 aircore holes completed to date across the Yanrey Project, totalling 7,850m
- Manyingee South: 19 new holes (26YRAC052 to 26YRAC070), 1,622m drilled
- Manyingee North: 21 new holes (26YRAC028 to 26YRAC048) reported in this release; 42 total holes completed at North this year across 5,218m
- Strike extension at Manyingee South: approximately 2,500m upstream (southeast) beyond the 2026 MRE polygon, with passive seismic indicating the channel continues at least a further 2km southeast
- Strike extension at Manyingee North: approximately 2,500m northwards beyond the 2025 MRE polygon; an additional 550m to the south via tenement E08/2896
- Manyingee North: 36 of 42 holes drilled this year intersected mineralisation above the cut-off grade
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What the drill results show — and why it matters
Manyingee South — mineralisation running the full length of the channel
The headline result at Manyingee South is that mineralisation has now been intersected across approximately 2,500m upstream of the 2026 MRE resource polygon, with the palaeochannel interpreted to continue southeast for at least another 2km — meaning mineralisation likely extends throughout that full length as well.
Infill drilling in the D roll-front zone (a geochemical boundary where uranium concentrates) extended the high-grade zone approximately 200m to the north and 300m to the west of its previously known extent. Mineralisation remains open to the south and southwest.
The most significant Manyingee South intercepts from this release:
- 26YRAC064: 0.48m @ 244.8 ppm eU3O8 from 53.12m; 0.48m @ 365.2 ppm from 59.38m; 0.86m @ 334.7 ppm from 71.04m; 0.34m @ 178.4 ppm from 72.18m; 0.36m @ 175.3 ppm from 74.06m; and 4.56m @ 346.3 ppm eU3O8 from 75.16m
- 26YRAC065: 0.88m @ 400.5 ppm eU3O8 from 51.86m; 0.58m @ 357.9 ppm from 53.96m; 1.38m @ 295.7 ppm from 58.80m; 0.20m @ 200.8 ppm from 68.66m; 1.74m @ 276.8 ppm from 75.70m; and 2.46m @ 234.7 ppm eU3O8 from 77.54m
- 26YRAC055: 1.74m @ 454.1 ppm eU3O8 from 66.18m; and 1.16m @ 359.4 ppm eU3O8 from 73.04m
- 26YRAC062: 0.24m @ 196.7 ppm from 51.29m; 0.42m @ 291.3 ppm from 52.03m; and 0.96m @ 538.7 ppm eU3O8 from 54.97m
The eU3O8 notation refers to equivalent uranium oxide grades derived from downhole gamma logging, the standard measurement method for this style of deposit.
Manyingee North — redox front extended, high-grade core confirmed
Step-out drilling has now extended the Manyingee redox front approximately 2,500m northwards beyond the 2025 MRE polygon, progressing through tenement E08/2896 and into E08/1489. Importantly, drilling reached the limit of current heritage clearance — not the limit of mineralisation — meaning the northern extent remains open.
The high-grade central zone, approximately 300 to 400m wide, has been extended a further 1,200m along strike to drillhole 26YRAC031. Passive seismic data suggests a tributary channel connects the Manyingee North palaeochannel to the adjacent Ashburton palaeochannel to the north and east.
The most significant Manyingee North intercepts:
- 26YRAC031: 0.64m @ 471.2 ppm eU3O8 from 89.63m; 0.68m @ 305 ppm from 95.61m; 0.88m @ 304 ppm from 111.43m; 0.38m @ 189.1 ppm from 114.23m; and 2.26m @ 339.2 ppm eU3O8 from 116.09m
- 26YRAC030: 0.24m @ 217.5 ppm from 85.04m; 0.38m @ 268.4 ppm from 85.72m; 0.40m @ 259.1 ppm from 86.62m; 0.44m @ 206.2 ppm from 93.70m; and 0.50m @ 208.6 ppm eU3O8 from 100.98m
- 26YRAC032: 0.40m @ 265.3 ppm from 86.48m; 0.62m @ 302.4 ppm from 107.32m; and 1.28m @ 236.2 ppm eU3O8 from 108.06m
Jonathan Fisher, Chief Executive Officer
“The 2026 drill program continues to be highly productive. We have moved on from expanding mineralisation at Manyingee North, where we have reached the limit of our existing heritage clearance, to expanding mineralisation at Manyingee South, with these latest results demonstrating that the mineralisation extends ~2.5 kms upstream, which is clearly a fabulous result. As is evident from our results, the uranium mineralisation at Yanrey is prolific. Our focus is on maximising the size potential of our MRE polygons (subject to independent confirmation) at Manyingee North and Manyingee South before we test potential new discovery areas. We look forward to publishing MRE updates for each of Manyingee North and Manyingee South in due course.”
Understanding uranium palaeochannel deposits — and what makes Yanrey unusual
A palaeochannel uranium deposit forms in ancient buried river channels — valleys carved millions of years ago and subsequently buried under sediments. Uranium-bearing groundwater flows through the porous sands within these channels until it hits a chemical boundary called a redox front (a zone where oxidising conditions give way to reducing conditions). At this boundary, uranium precipitates out of solution and accumulates over geological time.
This deposit style suits in-situ leach (ISL) mining, a method where a solution is pumped into the ground to dissolve the uranium and then pumped back to surface for processing. ISL avoids the need for open-pit or underground mining, resulting in lower costs and a smaller surface footprint compared with conventional mining approaches.
When geologists describe mineralisation as “open,” it means the resource boundary has not been closed by drilling. There is more mineralised ground beyond the last drill hole, and further drilling has a high probability of extending the MRE. At Yanrey, both Manyingee deposits remain open in multiple directions. Cauldron has identified over 30 palaeochannels within its tenement holdings, most of which are yet to be drill tested, making the potential for systematic resource growth substantial.
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The Yanrey inventory — where Cauldron stands today
| Deposit | Tonnes (Mt) | Grade (ppm eU3O8) | Contained (Mlbs) | Resource Status |
|---|---|---|---|---|
| Bennet Well | 38.9 | 358 | 30.9 | Indicated & Inferred (2016) |
| Manyingee South | 21.2 | 319 | 14.9 | Inferred (2025) |
| Manyingee North | 14.9 | 297 | 9.8 | Inferred (2026) |
| Total | — | — | 55.6 | — |
Both Manyingee deposits remain open to multiple directions, and MRE updates for each are pending following the current drill program. That makes the 55.6 Mlbs total a floor rather than a ceiling at this stage of exploration, with both deposits carrying clear upside into forthcoming resource revisions.
The Yanrey uranium exploration target of 269Mlbs sits well above the current 55.6Mlbs MRE, reflecting the scale of mineralised ground yet to be converted through systematic drilling across the project’s 30-plus identified palaeochannels.
What’s next — heritage clearance, new targets, and MRE updates
- A second heritage clearance was recently completed this calendar year. Cauldron is awaiting receipt of the clearance report before commencing track clearance and drilling on new targets, including the Manyingee Northwest prospect.
- New passive seismic targets identified during the 2026 survey program are expected to be tested in the current drilling program, drawing on over 30 palaeochannels identified across Cauldron’s tenements that are yet to be drill tested.
- MRE updates for both Manyingee North and Manyingee South are flagged by management as forthcoming “in due course.”
- Diamond core drilling is planned to twin high-grade aircore holes for assay validation, with exact hole locations yet to be selected as drilling remains ongoing.
- Further secular disequilibrium investigations (studies to check whether the radioactive decay chain is in balance, which affects grade calculations) are planned for Q2/Q3 2027.
- Cauldron continues to advocate for a lifting of the Western Australian uranium mining ban, a second pillar of management’s stated two-pronged strategy alongside ongoing resource growth at Yanrey.
For readers interested in how Cauldron’s broader Yanrey portfolio is expanding beyond the two Manyingee deposits, our detailed coverage of the Yanrey third discovery outlines the Cosgrove results and what a third mineralised palaeochannel means for the project’s long-term scale ambitions.
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