Results of up to 1.91% Li2O just 4km from Pilbara Minerals’ Pilgangoora lithium-tantalum mine; Drilling being planned for September

Kairos Managing Director, Dr Peter Turner said: “The high-grade lithium results, combined with the confirmation of spodumene mineralogy, is a very exciting development.


  • Five pegmatite samples from the Lucky Sump prospect at Mt York have returned exceptional assays including:
    • 1.91% Li2O & 103 ppm Ta (MYR393)
    • 1.56% Li2O & 115 ppm Ta (MYR401)
    • 0.58% Li2O & 167 ppm Ta (MYR396)
  • The spodumene-bearing pegmatite samples were discovered during routine earthmoving activities next to the flagship Mt York gold deposit
  • The spodumene pegmatites are part of a larger interpreted dyke swarm at Mt York
  • Planning underway to RC drill-test large area of Lucky Sump
“In light of these exceptional results, we plan to expedite planning to drill all of Lucky Sump. We intend to test the entire interpreted pegmatite dyke swarm, which is under cover, with the first RC drilling anticipated in September.

“We are in a Tier 1 destination for spodumene pegmatite projects with two world-class Li-Ta deposits (ASX:PLS, ASX:MRL) in the neighbourhood and we have demonstrated that we have the right fertile geology for significant Lithium-Caesium-Tantalum (LCT) pegmatite discoveries”.

Figure 1. Kairos Geologist Campbell Watts holding a piece of spodumene-bearing pegmatite (MYR393 – 1.91% Li2O) discovered at ‘Lucky Sump’ during routine earth moving activities.

Five samples of pegmatites that were analysed by hyperspectral and XRD methods confirming the presence of spodumene mineralogy (see KAI Announcement dated 12 July 2022), were submitted to NAGROM Laboratories in Perth for chemical analysis. Photographs of the pegmatites are shown in Figure 2.

The samples were crushed and pulverised and a 200g subsample selected for Na-peroxide fusion with hydrochloric acid digestion. This method was selected as it is considered to be a complete dissolution of all resistate minerals they may contain the selected elements of interest. The analysis of the samples was conducted using inductively couple plasma mass spectrometry (ICP-MS) with the elements Li, Rb, Cs, Be, Mn, Fe, Ti and Ta selected. The results are shown in Table 1.

Table 1. Assay results from NAGROM Laboratory, Perth. Conversion of Li ppm results to Li2O involves a two-step process to divide the Li ppm result by 10,000 (conversion to Li %) and multiplying Li % by 2.153 to obtain the Li2O equivalent. Method ICP005 refers to NAGROM’s Inductively coupled plasma mass spectrometry analysis code.

Figure 2. Lucky Sump pegmatite samples showing lithium and tantalum results.

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