DevEx Intersects Nabarlek-Style Alteration at KP in First Month of 2026 Campaign
Key Takeaways
- Diamond hole NBDD26003 at KP Prospect intersected a ~10-metre-wide altered fault breccia with semi-massive chlorite and minor hematite — the same alteration signature found proximal to the Nabarlek deposit itself.
- Big Radon returned 1.6m @ 680ppm eU₃O₈ from 26 metres depth (including 0.4m @ 1,041ppm eU₃O₈) in hole NAR26002, confirmed by handheld scintillometer and pXRF in the field, with laboratory assays still pending.
- RC drilling has commenced at Sandfire along strike from Deep Yellow's Angularli deposit (32.9Mlbs @ 1.09% U₃O₈), testing the projected extension of the Angularli Fault Zone.
- A new airborne hyperspectral survey was flown in August 2026, with first-pass results expected September 2026 — adding a fresh targeting layer across the project.
- Drill permit applications covering five additional targets were lodged with the NT regulator in June 2026, with Traditional Owner consent secured via the Northern Land Council for Mustang and Junction prospects.
DevEx intersects Nabarlek-style alteration in first month of 2026 drilling campaign
DevEx Resources has completed the first full month of its 2026 dry season campaign at its 100%-owned Nabarlek Uranium Project in the Northern Territory, intersecting strongly altered basement rocks at KP Prospect that resemble those hosting the Nabarlek deposit. This is the first phase of a sequenced, multi-year exploration pipeline designed to vector in on unconformity-style uranium targets systematically. DevEx is one of only a small number of companies able to test the McArthur Basin at scale. The company remains well funded to undertake these exploration activities, with results from remaining drill holes, laboratory assays, and a new hyperspectral survey to be released progressively.
Early validation of the unconformity-style model de-risks the multi-year pipeline. The company is not announcing a discovery — these are encouraging alteration signatures and modest down-hole gamma intercepts, with laboratory assays pending.
Campaign highlights across four active prospects
Progress to date includes:
- Drilling at three priority targets (KP, Sandfire, Big Radon)
- Drill permit applications lodged in June 2026 with the NT regulator to progress five targets to drill-ready status — awaiting approval
- New airborne hyperspectral survey flown in August 2026; first-pass results expected September 2026
- Rio Tinto application tenements acquired November 2025, consolidating ground east of Nabarlek
Significant down-hole intercept at Big Radon
| Prospect | Hole | From (m) | Interval (m) | eU₃O₈ Grade (ppm) |
|---|---|---|---|---|
| Big Radon | NAR26002 (RC2) | 26.0 | 1.6 | 680 |
| Big Radon (incl.) | NAR26002 (RC2) | — | 0.4 | 1,041 |
These are uranium equivalent (eU₃O₈) grades from calibrated down-hole gamma probes. Laboratory assays are pending and results may differ.
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KP Prospect delivers the standout alteration signature
Drilling at KP passed through approximately 100 metres of McArthur Basin sandstone cover into strongly altered hematite-chlorite basement schists resembling rocks proximal to the Nabarlek deposit. Diamond hole NBDD26003 (DD3) intersected a ~10-metre-wide altered fault breccia above the unconformity, infilled by semi-massive chlorite with minor hematite.
The significance: at Jabiluka, chlorite composition in overlying sandstone is identical to chlorite associated with mineralisation below the unconformity. Follow-up diamond holes are underway to test the structure where it crosses beneath the unconformity into a Nabarlek-type position.
Marnie Finlayson, Managing Director
“Early drilling at an unconformity-style uranium target is about answering three critical questions; is the fault where we predicted it? Does it sit in the right rocks? And is uranium present within the system?”
“One month into our drilling campaign, and we have started to answer these questions. At KP we are drilling into altered basement rocks that look a great deal like the rocks that host Nabarlek. That is exactly the sort of information a first pass should deliver, and this data will be used to inform future activities.”
Big Radon, Sandfire and emerging Caramal targets
Big Radon confirms mineralised fault zone
First-pass drilling (seven holes) confirmed a ~20-metre-wide fault zone; shallow uranium mineralisation was intersected adjacent in chlorite-altered schist. The intercept from hole RC2 (1.6m @ 680ppm eU₃O₈ from 26 metres, including 0.4m @ 1,041ppm eU₃O₈) was validated in the field via handheld scintillometer and pXRF, confirming uranium presence. Laboratory assays are pending. Structural logging of diamond hole DD2 is underway to determine follow-up drilling strategy. The fault has been tested on two broad spaced traverses 300 metres apart.
Sandfire tests Angularli Fault Zone extension
RC drilling has commenced on the projected extension of the Angularli Fault Zone, along strike from Deep Yellow’s Angularli deposit (32.9Mlbs @ 1.09% U₃O₈ — a Deep Yellow resource, not DevEx’s). Testing is expected over two to three weeks before the rig relocates to Nabarlek North.
New drill targets emerging at Caramal
Relogging of historical core identified a possible down-faulted northern continuation of the Caramal deposit, sitting deeper than most historical drilling reached. DevEx lodged a drilling application in June 2026 covering this target and four others. The company is awaiting NT regulator approval.
Understanding unconformity-style uranium
Unconformity-style uranium deposits are high-grade uranium concentrations at or near the boundary (unconformity) between older basement rocks and younger overlying sandstone, controlled by faults. Geologists vector in by looking for the right fault position, right host rocks, alteration clays (chlorite and hematite), and evidence that uranium is migrating through the system. As Finlayson noted, “The McArthur Basin is Australia’s Athabasca,” — host to Nabarlek, Ranger, and Jabiluka, yet historically under-explored versus Canada’s Athabasca Basin.
These deposits can be small in footprint but exceptionally high grade. That is why methodical targeting is worth the patience.
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What’s next — the multi-year pipeline ahead
- Remaining drill hole results and laboratory assays released progressively
- Hyperspectral survey first-pass results expected September 2026
- ASTER ferric-oxide reprocessing identifying targets north and south of Caramal for field follow-up
- Anthropological surveys commencing early September 2026 at Mustang and Junction (Traditional Owner consent secured via Northern Land Council)
- Priority tenement applications (Mustang, Corsair, Junction, Skytrain) progressing over the coming 12 to 18 months
DevEx is funded to work through the pipeline. The company’s approach is systematic and multi-year — layering data patiently and testing targets methodically. What makes the effort worth it is the grade and scale of what sits at the end of it.
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