Highlights

  • A controlled-source audio-magnetotelluric survey covered 16.8 line-kilometres on nine lines, with 344 stations, at the Quinn Fluorspar Project.
  • OD6 interprets the Mammoth breccia as extending more than 500 metres subvertically and Horseshoe mineralisation about 300 metres down dip.
  • Targets are interpretive and need drilling, and the company stressed that resistivity is not a direct measure of fluorspar.
  • Maiden drilling and bulk sampling at Horseshoe and Mammoth are planned for early 2027, subject to US Forest Service permitting.

OD6 Metals Limited (ASX:OD6) has looked below its Nevada fluorspar outcrops, and it likes what the survey suggests. In an announcement dated 28 October 2026, the company said a controlled-source audio-magnetotelluric (CSAMT) survey at its Quinn Fluorspar Project has imaged features it interprets as extensions of known mineralisation. No drilling is reported, and the company said resistivity is not a direct measure of fluorspar.

What was surveyed

The survey covered 16.8 line-kilometres on nine lines, with 344 stations, across the Horseshoe to Spar area, the Mammoth prospect and the Dress Circle area. Two independent firms, KLM Geoscience and Wright Geophysics, inverted the data, which resolve resistivity to about 800 metres depth, with Wright's confidence limited to about 500 metres. The company described data quality as good to excellent, with 250 metres of line repeated.

The project comprises 226 Nevada state mining claims on National Forest land outside Wilderness Study Areas. A 2 per cent net smelter royalty applies to future production from Horseshoe, Mammoth and Bonanza, but not Blue Bell, Cortez or Bruno, and state royalties also apply.

Interpreted targets

At Mammoth, an outcropping breccia with a footprint above 14,000 square metres has previously returned 20 to 40 per cent calcium fluoride (CaF2). The survey suggests the body may extend more than 500 metres subvertically, with a second, west-dipping target parallel to bedding.

At Horseshoe, the near-surface zone is interpreted to continue about 300 metres down dip beneath talus, with an inferred width of 20 to 40 metres, and a steep feeder structure through the Saw Mill Thrust may extend beyond 200 metres depth. Earlier historical channel sampling there included up to 50 metres at 79.3 per cent CaF2.

The Saw Mill Thrust was imaged beneath the Lithocap and is described as the key horizon linking Horseshoe, North Horseshoe Canyon and Big Jim. At Big Jim, previously reported assays exceed 90 per cent CaF2, with a massive vein reaching 99.9 per cent, and the survey shows a strongly resistive alteration zone more than 200 metres in vertical extent beneath it. Rock chips at North Horseshoe Canyon returned up to 60.0 per cent CaF2. Source intrusions were mapped in three dimensions beneath the Lithocap.

At Dress Circle, soil sampling had shown gold and pathfinder anomalism, with some fluorine, and the resistivity contrasts suggest possible intrusion-related or epithermal gold. No drilling has been carried out there.

Limitations

No Mineral Resource or Ore Reserve is reported, and geophysical data are not used for resource estimation. The results come from two-dimensional inversions, so oblique structures and three-dimensional effects may distort the modelled geometry. The Competent Person, Dr Darren Holden of GeoSpy Pty Ltd, is a geological adviser who holds OD6 shares and participates in its incentive plan. Earlier assay figures come from company releases dated 25 August to 17 September 2026.

Next steps

Before drilling, OD6 will combine the CSAMT data with geological mapping, surface sampling and structural work to prioritise targets at Mammoth, Horseshoe and the Saw Mill Thrust corridor. Other work includes exploring further high-grade occurrences across the expanded Quinn District, continuing metallurgical and ore-sorting testwork for its Metspar and Acidspar products, and planning baseline environmental and cultural studies for additional targets. Drilling cannot proceed until permits are granted, and no resource estimate or production timetable is given.