Key Highlights

  • Cullen Resources (ASX:CUL) reported on 14 September 2026 1-metre resample assays from reconnaissance air core drilling at the Cleanthes and Lila gold prospects at the Yardilla Project.
  • Values include up to 2.42g/t gold, 2,610ppm copper and 6.7g/t silver over 1-metre intervals, and 20 metres at 0.11g/t gold from 30 metres.
  • The anomalies have never been tested in bedrock, and the company says follow-up deeper air core and/or RC drilling is warranted.

Cullen Resources Limited (ASX:CUL) announced on 14 September 2026 an exploration update on its Yardilla Yilgarn Craton Boundary Gold Project in Western Australia. The update reports 1-metre resample assays from reconnaissance air core drilling completed in May 2026.

This article describes the company, the sector context, the results and the factors that may influence the project.

About Cullen Resources

Cullen Resources Limited is an ASX-listed exploration company with a registered office in South Perth, Western Australia. Its Yardilla Project is on exploration licences E63/2487 and E63/2463 on the boundary of the Yilgarn Craton. The announcement notes that active explorers on the same trend include the Viking Project (ASX:TXR) and the Forelands Project (ASX:BPM).

Cullen does not report production revenue. The May drilling comprised 25 air core holes (YAAC001 to YAAC025) for 1,338 metres at the Cleanthes and Lila prospects.

Sector backdrop

Air core drilling is a rapid method for sampling the weathered rock profile, and companies use it to find gold, copper and silver anomalies near the top of fresh rock. Composite samples of five metres can be resampled at one metre to refine where the anomalous values are located.

Anomalies in saprolite, the weathered rock above fresh bedrock, can reflect mineralisation in the underlying rocks or dispersion, and are commonly followed by deeper drilling to test bedrock.

Explorers on the Yilgarn Craton boundary often work in areas covered by regolith, where historical RAB drilling provides early anomalies.

Yardilla exploration update released on 14 September 2026

Resample results

Composite samples from the May program had returned shallow gold values close to the top of fresh rock, including 10 metres at 0.14g/t gold from 30 metres in YAAC014 and 10 metres at 0.18g/t from 25 metres in YAAC015 at Cleanthes, and 5 metres at 0.14g/t from 45 metres in YAAC007 and 1 metre at 0.19g/t from 50 metres to end of hole in YAAC006 at Lila. Resampling at 1-metre intervals returned up to 2.42g/t gold, 2,610ppm copper and 6.7g/t silver over 1-metre intervals and 20 metres at 0.11g/t gold from 30 metres.

Drilling intersected mainly foliated to gneissic, mafic and felsic, sericitic and biotitic rocks with trace to 5% pyrite, and confirmed and extended historical shallow gold anomalies mainly in granite. Both prospects lie close to granite-metapelite-mafic schist contacts. At Lila the anomalies appear parallel to strata and thrusts on a north-east trend, and at Cleanthes they appear to parallel the major north-west lithological contact. The company notes limited data suggest the anomalous zones may be flat lying or gently dipping.

Targets

The first-pass anomalies have never been tested in bedrock and lie within targets of about 2 kilometres in length at both Lila and Cleanthes, defined by combining gold, copper and silver anomalies from historical RAB drilling.

The announcement's table lists the 1-metre resample assays for gold, silver, arsenic, bismuth, copper, molybdenum, nickel, lead, sulphur, antimony, tungsten and zinc for holes at Lila and Cleanthes, and shows bedrock interpretation and regional location maps. The company states that drilling confirmed and extended historical, shallow gold anomalies, mainly in granite, and that anomalies adjacent to granite-metapelite-mafic schist contacts may be flat lying to gently dipping and require further investigation.

Core growth drivers and material operating risks

Core growth drivers

The items identified are follow-up deeper air core or RC drilling to test the anomalies in bedrock, and the combined gold-copper-silver targets of about 2 kilometres at Lila and Cleanthes.

Material operating risks

The reported grades are low apart from single metre intervals, and the anomalies are in the weathered profile. The orientation of the zones is uncertain, and no bedrock results are available. The company has not announced a date or funding for follow-up drilling.