Highlights

  • Dart Mining begins 1,500m diamond drill programme at Walwa tin project targeting deeper aplite-pegmatite dykes identified by seismic surveys.
  • Rock chips from historic pit walls returned up to 3.96% tin, with elevated tantalum and niobium, though samples are selective.
  • Coonambula antimony-gold zone tested over 500m strike returns best hole of 12.0m at 1.03g/t gold and 1.01g/t silver from 128m.
  • Company acquires ~865 sq km Yamarna tenements in WA, prospective for gold and lithium, located ~25km west of Gruyere mine.

Diamond drilling has begun at Dart Mining NL's (ASX:DTM) Walwa tin project in north-east Victoria, targeting tin-bearing structures well below historical workings that only reached 160m depth. The 1,500m programme, commenced 16 October 2026 under exploration licence EL007426, tests aplite-pegmatite dykes identified by seismic surveys at depth, as well as a conceptual greisen-hosted tin target sitting 400-600m below surface.

Drilling Beneath the Historic Workings

Seismic surveys have identified up to four additional tin-bearing dykes beyond those known from surface and historical records. Rock chip sampling from pit walls — selective samples that are not representative of overall grade — returned values up to 3.96% tin, with elevated tantalum and niobium concentrations. Both tin and tungsten, present across Dart's Victorian tenements, are classified as critical minerals. Walwa remains early-stage with no Mineral Resource declared.

The greisen-hosted target at 400-600m depth is conceptual and untested. Prior drilling at the site penetrated only to 160m, meaning the deeper structural target has not been drilled before. The programme will also inform geological models for McHargs and Koetong tungsten prospects nearby, where management is reviewing historical data ahead of planning maiden drilling campaigns.

Queensland: Coonambula Gold-Antimony

At Coonambula in Queensland, the joint venture Banshee antimony-gold-silver zone has been tested over 500m of strike and remains open along both strike and at depth. Best results include hole CBADD037 returning 12.0m at 1.03g/t gold and 1.01g/t silver from 128m depth (true width not confirmed). Metallurgical studies are continuing, with a resource estimate targeted for the December 2026 quarter.

Antimony is a critical mineral with applications in defence, flame retardants and battery technology, adding strategic weight to Coonambula's gold-focused drill programme. The zone's behaviour at depth and along strike will be the key factor in any resource definition.

Western Australia Expansion

Dart agreed on 20 August 2026 to acquire 100% of one granted tenement and seven applications covering approximately 865 square kilometres at Yamarna, located roughly 25km west of the Gruyere gold mine. The ground is prospective for both gold and lithium. No exploration has been conducted since acquisition; Yamarna represents an early-stage footprint addition in a well-regarded address.

In Victoria, Dart has signed a Sale and Purchase Deed to divest certain Victorian tenements to Indigo Metals, though completion depends on Indigo progressing its proposed IPO and ASX listing. The specific tenements and financial terms were not detailed in the quarterly.

Next Steps

The 1,500m Walwa diamond programme is expected to run over the coming weeks, with assays to follow. Maiden drill proposals at McHargs and Koetong are being designed. In Queensland, metallurgical work at Coonambula will continue ahead of the resource estimate. The Victorian divestment will remain pending until Indigo achieves its listing.