DevEx Maps a New Uranium Pathway North-West of Nabarlek

Uranium Intersections Confirmed at Nabarlek North

DevEx Resources Limited (ASX:DEV) has found uranium-equivalent mineralisation in first-pass drilling along the Nabarlek Fault Corridor, north-west of the historical Nabarlek mine in the Northern Territory. Hole NAR26012 returned 2.3 metres at 920 parts per million eU3O8 from 184 metres, including 0.8 metres at 1,361ppm, while NAR26013 intersected 1.7 metres at 1,116ppm from 168.8 metres.

The results come from a 40-hole, 11,050-metre campaign across the Nabarlek, KP, Sandfire and Big Radon prospects. DevEx said the Nabarlek North drilling was designed to test a previously poorly constrained section of the Nabarlek Fault, where historical drilling had been spaced at roughly 400-metre traverses and may not have been capable of identifying a narrow, high-grade structure.

The reported grades are estimates derived from calibrated down-hole gamma readings, not chemical laboratory assays. The intervals are reported as down-hole lengths, with true widths yet to be determined. DevEx said laboratory assays remain pending, leaving the next set of results important in determining how closely the gamma-derived estimates correspond with chemical analysis.

Hyperspectral Survey Extends the Target Corridor

A new airborne hyperspectral survey has added a second layer to the exploration story. Initial interpretation has mapped extensive illite alteration in the McArthur Basin sandstones overlying the north-western projection of the Nabarlek Fault Corridor, with several kilometre-scale areas identified for field mapping, pathfinder sampling and possible future drilling.

Illite alteration is considered by DevEx to be a relevant exploration feature in the region because it has been documented above unconformity-type uranium deposits in the Athabasca and McArthur Basin provinces. That makes the survey useful as a targeting tool, although the interpretation remains preliminary and the company says the highlighted areas still require ground confirmation.

The company’s enlarged land position and funded multi-year exploration plan were outlined in its district-scale Nabarlek pipeline, which identified multiple drill-ready targets ahead of the 2026 campaign. At Nabarlek North, follow-up drilling will be guided by the newly interpreted offset in the unconformity, along with alteration, pathfinder and hyperspectral data.

KP Shows Alteration but No Confirmed Mineralisation

At KP, drilling passed through about 100 metres of sandstone into basement schists displaying strong chlorite-haematite alteration. The alteration is most pronounced around the unconformity and intensifies towards the north-west, which DevEx views as a possible vector towards a Nabarlek-type uranium target.

However, the filing does not report a significant uranium intersection at KP. Diamond hole NBDD26004 recorded gamma readings equivalent to about 30ppm eU3O8 over a short interval at the unconformity, but it missed the interpreted KP fault zone in the basement. Ground geophysics, a recently completed seismic survey and further structural analysis are now being used to refine the next targets.

Sandfire Target Downgraded as Access Work Continues

Results were less encouraging at Sandfire, where drilling intersected the projected Angularli Fault Zone and identified a silica-rich fault zone in the expected position. The absence of significant uranium results and chlorite alteration in adjacent rocks has led DevEx to downgrade the target.

Elsewhere, Traditional Owners have consented to the Northern Land Council negotiating access agreements over the Mustang and Junction tenement applications, while anthropological surveys have been completed. Those steps could support access to priority targets over the next 12 to 18 months, but they do not yet amount to completed exploration access.