Nanadie Project (100%)

(Copper-Gold)

The Nanadie Copper-Gold Project is located north-east of Sandstone in the Murchison District, Western Australia. It comprises granted licences M51/887, E51/1040, E51/1987 and L51/124 and exploration licence application E20/1097 covering a total of 137km².

Nanadie represents a low cost, high leverage copper opportunity underpinned by an existing JORC-compliant Inferred Mineral Resource Estimate (MRE) of 40.4Mt @ 0.4% copper and 0.1g/t gold for 162kt of contained copper and 130koz gold. The deposit sits in a zone at least 150m wide by 1km long, extends to surface and remains under-explored at the margins, depth, and along strike – offering exceptional exploration upside.

The MRE sits within a granted Mining Lease in a typical flat northern Goldfields setting, with shallow sand and soil obscuring a geological package dominated by mafic intrusive, amphibolite and granitoid intrusive rocks.

Solstice’s maiden Reverse Circulation (RC) delivered immediate success, with the first holes returning impressive, best-yet drill intercepts that demonstrate the strength of the Nanadie mineralised system:

62m @ 1.55% Cu, 0.66g/t Au to end of hole (EOH) from 256m (NANRC004), including:
22m @ 2.78% Cu, 1.25g/t Au from 261m, and
97m @ 0.73% Cu, 0.30g/t Au to EOH from 203m (NANRC001).

Since then, ongoing RC drilling has delivered wide zones of significant copper mineralisation in holes throughout the MRE area, including many holes drilled as ‘pre-collars’ for extending with future diamond ‘tails’ (i.e. the key target zone remains further to the east/at depth).  Importantly ongoing drilling is intersecting widespread disseminated and vein style chalcopyrite (copper sulphide) mineralisation, demonstrating the width of the host gabbro and of the overall mineralised system. The deposit as currently defined is 100-200m wide, at least 1.2km long, and remains open to the north, south and at depth.

Broad and continuous zones of high-grade mineralisation associated with alteration and deformation are taking shape in the eastern 100m of the host gabbro. This ‘eastern margin’ corridor is emerging as a key exploration and MRE extension target that will see a combination of shallow RC drilling and diamond tails to increase drill density through the zone.

Recent assays from the Company’s first diamond ‘tail’ (extending a precollar RC hole), NANRCD004, delivered an exceptional combined RC and diamond intercept of 629.1m @ 0.50% Cu, 0.17g/t Au from surface to end of hole (EOH) (including all unmineralised intervals), including 62m @ 1.55% Cu, 0.66g/t Au, 30.7m @ 1.41% Cu, 0.34g/t Au and 37.8m @ 0.87% Cu, 0.25g/t Au all within the eastern margin of the host gabbro. Visual observations of significant disseminated and vein sulphide were also reported in follow-up tail NANRCD0053, which intersected strong zones of mineralisation from the base of the pre-collar to its final depth of 840m.

Solstice’s ongoing RC and diamond campaign comprises step-out strike traverses, MRE delineation holes, and step-down exploration holes generally testing the deposit between surface and approximately 500m below the existing MRE. Observed geology in both RC and diamond drilling continues to be broadly consistent with that seen in Solstice’s drilling reported to date and is building the Company’s geological understanding of this substantial and growing mineralised system.

Our work to date has shown clear potential to expand an already significant deposit into a standout large-volume copper-gold system in WA’s premier Goldfields mining jurisdiction. With $45 million cash (at June 30 2026) and no debt, Solstice is well positioned to continue growing Nanadie through drilling, IP and downhole EM geophysical techniques, and applying an updated geological model that has opened targets at the nearby Stark Prospect and exploration corridors extending north from Nanadie and Stark beneath shallow transported cover.

Nanadie Geology

Phase 1 RC drilling, as well as systematic re-logging of historical drill holes has resulted in increased understanding of the copper-gold mineralisation and has built a geological picture comprising a widely mineralised steeply dipping host mafic intrusive (gabbro and dolerite) package flanked by amphibolite (that is also mineralised in places), and younger granitoid rocks to the west.

Historical drilling below a shallow soil and sand cover and ~30m partial weathering profile has defined a wide, near-surface accumulation of disseminated and remobilised sulphide veinlet style chalcopyrite (+/- pyrrhotite and pyrite) mineralisation. Approximately 90% of the MRE is fresh rock mineralisation below 40m depth.

Significant zones of >1% Cu occur where chalcopyrite vein density increases, and increased sulphide veining is typically accompanied by raised gold values. The fine disseminated and vein sulphide mineralisation is a style that lends itself to simple float extraction. No deleterious elements have been noted in available multi-element data, and Solstice expects that planned sighter metallurgical test work will demonstrate a commercial concentrate could be produced.

An updated geological model suggests both deposits have a broad accumulation of disseminated copper-gold mineralisation in an intrusive setting, followed by remobilisation during a deformation, felsic intrusion and alteration event likely responsible for the wide zones of high-grade mineralisation encountered to date. The revised model has significantly expanded the Company’s exploration footprint and identified multiple new opportunities for both strike extensions and structural repetitions, including at Stark and in sparsely explored soil-covered areas to the north and south of existing drilling.

Nanadie Project drill chips from drill hole NANRC004 showing strong Cu and Au mineralisation.