Highlights

  • Tambourah Metals reports best lithium results of 1.143% Li2O from rock chips at Coondina, identifying lepidolite-bearing LCT-style pegmatites in the Pilbara.
  • Eleys sampling returns up to 572 ppm tantalum along a fractionated northwest-trending pegmatite structure historically worked for tantalum.
  • A gossan at Coondina returns 151.2 g/t silver, 2,118.7 ppm bismuth and 0.395% copper, prompting plans to test for platinum group elements.
  • Results are reconnaissance only — true widths are unknown, grade continuity is unestablished and no drilling has been completed at either project.

Tambourah Metals has reported the first results from a reconnaissance rock-chip programme across its Coondina and Eleys ground in Western Australia's Pilbara, identifying lithium-bearing pegmatites, a tantalum corridor and an unexpected silver-copper-bismuth gossan. The explorer (ASX:TMB) released the assays on 27 October 2026 from 79 samples collected roughly 80 kilometres southwest of Marble Bar.

Lithium and Tantalum Signals

At Coondina, sampling located lepidolite-bearing pegmatites near a mapped greenstone inlier. The best individual result returned 1.143% lithium oxide, with another reaching 1.012%. Tambourah describes the pegmatites as laterally extensive dykes about one to two metres wide. Some contain fluorite, which the company suggests may point to a hybrid between the lithium-caesium-tantalum (LCT) and niobium-yttrium-fluorine pegmatite families — a distinction that matters because the two types tend to host different metal suites.

At Eleys, sampling followed a northwest-trending structure historically worked for tantalum. The highest result was 572 ppm tantalum, accompanied by elevated caesium, niobium and tin. Tambourah says the work confirms fractionated pegmatites extend northeast of the old Five Mile alluvial tin operation, ground the company says has not previously been explored for LCT pegmatites.

An Unexpected Gossan

The most striking single number came from a gossanous, malachite-stained outcrop beside an east-west ultramafic to mafic dyke at Coondina. Sample CHCC162 returned 151.2 g/t silver, 2,118.7 ppm bismuth and 0.395% copper. Samples taken along strike showed mildly elevated silver and bismuth, which the company interprets as a possible intrusion-related mineralising event. Tambourah intends to extend sampling over the gossan and test for platinum group elements. The announcement's highlights round the gossan sample differently from Table 1; the table values are used here.

The Pilbara Setting

The pegmatites sit within a district where granites of the Split Rocks Supersuite are linked to major spodumene deposits such as Wodgina, Pilgangoora and Tabba Tabba. However, the minerals identified at Coondina are lepidolite rather than spodumene, and proximity to known deposits does not establish that comparable mineralisation exists here. Tambourah has completed a 167 square kilometre hyperspectral survey at Coondina and is working with CSIRO under a Kick-Start research collaboration to refine machine-learning methods for identifying LCT targets.

Limits of the Data and Next Steps

These are isolated reconnaissance samples. Rock chips do not indicate the thickness, continuity or extent of mineralisation, true widths are unknown, and grade continuity has not been established. No company quality-control samples were inserted, and the Competent Person is a director and shareholder of the company. No drilling has been reported, and neither Coondina nor Eleys has a defined mineral resource.

Tambourah plans follow-up field sampling to fill gaps between the most fractionated zones, review the Coondina hyperspectral data and expand gossan sampling, including assays for platinum group elements. No drilling timetable has been given, and any decision to drill will depend on whether follow-up mapping can trace the pegmatites beneath extensive scree cover.