RareX Maiden Khaleesi Drilling Confirms Copper–Nickel Sulphide System and Gallium-Rich Regolith at Niobe

Aakashdeep

03 November 2026 10:15 AM AEDT

RareX Maiden Khaleesi Drilling Confirms Copper–Nickel Sulphide System and Gallium-Rich Regolith at Niobe

Image Source: Krish Capital Pty Ltd

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RareX Limited (ASX:REE) has released laboratory assay results from its maiden reverse circulation drilling program at the Khaleesi Project in the East Yilgarn, Western Australia, confirming a copper–nickel sulphide system within a layered mafic intrusion at the Niobe Copper prospect and gallium-rich regolith over the Niobe granite.

Key Points

Maiden basement drilling comprised 22 RC holes for 1,953m across five prospects within the Khaleesi Alkaline Intrusive Complex (KAIC)
KRC012 returned 40m at 0.13% Cu and 374ppm Ni from 110m, including 24m at 0.16% Cu and 543ppm Ni from 126m
Gallium-rich regolith confirmed with KRC017 returning 20m at 73 g/t Ga2O3 from 8m and KRC009 returning 16m at 75 g/t Ga2O3 from 8m
An IP survey is scheduled to commence at Niobe in November, and initial gallium metallurgical test work will commence

Maiden Khaleesi Drilling Program Scope and Structure

The program comprised 22 RC holes for 1,953m across five prospects: Niobe Copper (6 holes, 805m), Niobe Gallium (10 holes, 438m), Rim (3 holes, 336m), Nb (2 holes, 230m), and Mag (1 hole, 144m). The holes tested coincident gravity and magnetic anomalies and areas of elevated gallium, niobium, and rare earths. According to the filing, most historical drilling stopped at the top of basement, making this program the first broad examination of the basement geology of the KAIC. The results confirm a fertile alkaline intrusive system, with copper–nickel sulphides in a mafic intrusion at Niobe and gallium, rare earth, and niobium enrichment associated with granites across the complex.

Niobe Copper Sulphide Mineralisation and Assay Results

Six holes for 805m were drilled on two east–west lines 400m apart at Niobe Copper. Laboratory assays confirmed copper–nickel sulphide mineralisation in holes KRC012 and KRC007, consisting of disseminated to locally semi-massive pyrite and chalcopyrite. KRC012 returned a best intercept of 40m at 0.13% Cu and 374ppm Ni from 110m, including 24m at 0.16% Cu and 543ppm Ni from 126m, and a sub-interval of 2m at 0.38% Cu and 1,705ppm Ni from 127m. The filing states the association of copper with nickel and cobalt inside a mafic intrusion is characteristic of a magmatic sulphide system, and that the Niobe intrusion remains largely untested.

Gallium-Rich Regolith Intersections and Planned Next Steps

Drilling confirmed gallium-rich regolith over the Niobe granite, with KRC017 returning 20m at 73 g/t Ga2O3 from 8m and KRC009 returning 16m at 75 g/t Ga2O3 from 8m. Broad granite-hosted gallium zones were also intersected at the Nb prospect, including 91m at 59 g/t Ga2O3 from 24m in KRC006. According to the filing, an IP survey will commence at Niobe in November to vector towards higher concentrations of copper sulphides, and initial gallium metallurgical test work will commence. The filing states the untested non-magnetic portions of the Niobe gravity anomaly are of particular interest and will be assessed with chargeability anomalies from the planned IP survey.

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