Cauldron Energy Maps Major New Manyingee South Palaeochannel Arm at Yanrey

Cauldron Energy (ASX: CXU) has mapped a previously unknown and untested arm of the Manyingee South palaeochannel through its latest passive seismic surveying at the Yanrey uranium project in Western Australia.

The upstream extension is approximately one kilometre wide, continues for at least 3km and divides into three branches.

A separate tributary extends 2km southwest from the junction of the deposit’s high-grade zone, continuing beyond the current mineral resource estimate (MRE) boundary into a broad lagoon measuring about 2km by 2.5km, creating a priority area for follow-up exploration.

The results cover 29 survey lines totalling 153.3km and add to the target inventory surrounding Yanrey’s three deposits, which contain a combined 55.6 million pounds of uranium oxide.

Yanrey covers approximately 1,493km² south of Onslow through 21 granted exploration tenements and five exploration licence applications across more than 80km of interpreted Early Cretaceous coastline.

New Channel Geometry

Cauldron uses airborne electromagnetic surveys to identify buried palaeovalleys before passive seismic work more precisely defines channel margins, smaller tributaries, and bedrock geometry ahead of air-core drilling.

The latest interpretations mapped the eastern arm of Manyingee South, extended the main channel upstream, and confirmed the large western tributary that drilling during 2025 had suggested but not established.

Cauldron considers the western tributary and upstream lagoon a high-priority target and plans a second Aboriginal heritage clearance during the September quarter of 2026 as part of preparations for follow-up work.

“The overall results indicate that the palaeochannel system at Yanrey is prolific and far larger and more complex than originally understood; a real positive,” chief executive officer Jonathan Fisher said.

“With 20+ additional palaeochannels yet to be tested, and passive seismic surveying continuing to define more palaeochannels, confidence is high that the extent of uranium mineralisation at Yanrey will continue to grow significantly with further drilling.”

Regional Targets Gain Definition

Five survey lines covering 28.3km at Ashburton East indicate an offshoot of the main Manyingee palaeochannel enters a broad lagoon before passing through a steeply incised gorge less than 700m wide.

The restricted embayment occupies a geographical setting similar to the Bennet Well East deposit, and Cauldron considers it another high-priority target for future drilling.

At Cosgrove, eight lines covering 48.5km defined a separate palaeochannel approximately 1.5km wide and 3.5km long, with exploration drilling indicating a maximum depth to bedrock of 125m.

Scout drilling has encountered mineralisation in three of five holes across 1.2km at Cosgrove, supporting further work within a network where all five palaeochannel systems tested to date have been mineralised.

Cauldron is also drilling at Manyingee North, and expects to begin testing additional targets as the exploration program continues through August and September.

The company estimates passive seismic has covered only about 20% of Yanrey, while more than 20 additional palaeochannels remain untested and further drilling is intended to expand existing MREs.