Manyingee South Deposit
The Manyingee South Deposit is contained within Cauldron’s Yanrey Uranium Project in Western Australia and is located approximately 17 kms to the north-east of Cauldron’s Bennet Well deposit and 4.5 kms south-southwest of Paladin’s Manyingee deposit. Mineralisation occurs over an area 5 kms long and up to 2kms wide with mineralisation remaining open upstream to the southeast and to the southwest.
Manyingee South was discovered in 2024 by following up indications of low-grade uranium mineralisation in four historic exploration holes drilled in 2015.
A maiden Mineral Resource Estimate (MRE) of 11.1 Mlb (5,054 t) of uranium-oxide (15.5 Mt at 325 ppm eU3O8 for at 100 ppm cut-off) was released on 2 April 2025.
Follow up drilling was conducted in 2025 comprising of 46 air-core holes for a further 3,649 m. This work extended mineralisation a further 1,000 m back upstream across the E08/1489 tenement boundary and onto E08/3204 (acquired by Cauldron from Wyloo Metals in 2025). Mineralisation widths now vary 500 m in the north to over 2,000 m along the southern edge of the E08/1489 tenement.
A revised Mineral Resource Estimate (MRE) of 21.2 Mt @ 320 ppm eU3O8 for 14.9 Mlb (6,773 t) of uranium-oxide at 100 ppm cut-off[1].
[1] Refer CXU’s ASX announcement of 17 February 2026 titled “CXU adds 13.8Mlbs at Yanrey”
Cumulative GT (ppm*m) map of the high-grade “D roll-front” zone at Manyingee South
Distribution of eU3O8 grades, Manyingee South (plan view).
Passive seismic surveying indicates the Manyingee South channel bifurcates at its northern end into two arms trending northwest and northeast. The northeast arm rejoins the Manyingee Channel where mineralisation is expected to connect with Paladin’s Manyingee Deposit, 4.5 kms to the north-east.
The Manyingee South Deposit has not yet been tested north of the termination of the redox front. Drilling at Manyingee North indicates mineralisation continues for more than 4 kilometres north of the redox front.
Large resource with significant potential to grow. Mineralisation is open south, north and across the width of the palaeochannel.
Surveys have determined that the palaeochannel continues southwards for several kilometres
Amenability to In situ leaching, facilitating a low cost operation and hence increasing the attractiveness of the asset from a development perspective.
Manyingee South Resource Estimates
The maiden Mineral Resource Estimate (JORC 2012) for the mineralisation at Manyingee South was completed by Mr Dmitry Pertel, Principal Geologist of AMC Consultants Pty Ltd (AMC).
Mr Pertel completed the Mineral Resource Estimate. The Quality Assurance and Quality Control (QAQC) analysis was completed by Mr John Higgins, a full-time employee of Cauldron, assisted by Mr Robert Annett, a consulting geologist engaged by Cauldron. The conversion of downhole gamma grades to estimated eU3O8 grades was undertaken by Mr David Wilson, Principal Geoscientist with 3D Exploration.
Mr Pertel assumes Competent Person status for the reported Mineral Resources, Mr Higgins and Mr Annett assume Competent Person status for the QAQC analysis, and Mr Wilson assumes Competent Person for the reported eU3O8 grades. A site visit was completed by Mr Annett.
Each of Mr Pertel, Higgins, Annett and Wilson are a Member of the Australasian Institute of Geoscientists and have the necessary qualifications and relevant experience in the style of mineralisation at Manyingee South to qualify as Competent Persons under the JORC Code.
The Table below sets out grade-tonnage information with cut-off grades between 0 and 800 ppm eU3O8 which is considered useful for sensitivity analysis. The Mineral Resource classification applies to the 100 ppm cut-off grade.
Competent Person Statement
Mineral Resource Estimate – Manyingee South Deposit
The information in this report that relates to Mineral Resources for the Manyingee South Deposit is extracted from a report released to the Australian Securities Exchange (ASX) on 3 April 2025 titled “Maiden MRE of 11.1Mlbs eU3O8 at Manyingee South Adds to Cauldron’s Inventory at Yanrey” and available to view at www.cauldronenergy.com.au and for which Competent Persons’ consents were obtained. Each Competent Person’s consent remains in place for subsequent releases by the Company of the same information in the same form and context, until the consent is withdrawn or replaced by a subsequent report and accompanying consent.
The Company confirms that is not aware of any new information or data that materially affects the information included in the original ASX announcement released on 3 April 2025 and, in the case of estimates of Mineral Resources, that all material assumptions and technical parameters underpinning the estimates in the original ASX announcement continue to apply and have not materially changed. The Company confirms that the form and context in which the Competent Persons’ findings are presented have not been materially modified from the original ASX announcement.