Key Highlights

  • 16.8 line kilometres of CSAMT geophysical survey completed over 9 lines at the Quinn Fluorspar Project in Nevada, delivering the first deep-imaging dataset across the project's key deposits.
  • At the Mammoth deposit, CSAMT results infer a major depth extension target extending more than 500m below surface, plus a second target zone dipping west parallel with bedding.
  • At the Horseshoe deposit, a tabular body with up and down dip continuations beneath cover has been identified, with thickness of 20 to 40 metres and a potential steep feeder structure extending beyond 200m depth.
  • Results will be incorporated into geological models ahead of the company's maiden drilling campaign planned for early 2027, targeting both known high-grade mineralisation and broader system-scale potential.

A Geophysical First at Quinn

OD6 Metals Limited (ASX:OD6) has added meaningful depth to its understanding of the Quinn Fluorspar Project in Nevada after completing a 16.8-line-kilometre Controlled Source Audio Magneto-Telluric (CSAMT) geophysical survey. The survey, covering nine lines across the project's key fluorspar deposits, represents the first deep-imaging dataset to be gathered at Quinn — a notable milestone for a company preparing to drill for the first time in early 2027.

The CSAMT technique works by measuring variations in electrical resistivity in rocks down to depths exceeding 500 metres. Fluorspar — or calcium fluoride (CaF2) — is electrically resistive, meaning it creates a measurable contrast against surrounding geology that CSAMT can map. The method has been applied across all of Quinn's principal deposits and prospect corridors, with results that Managing Director Brett Hazelden described as encouraging evidence that the structures hosting known high-grade surface mineralisation may extend significantly beneath cover and at depth.

Mammoth and Horseshoe Results

At the Mammoth fluorspar deposit, CSAMT modelling has identified what the company describes as a major resistive structure potentially extending more than 500 metres below surface, well beyond the depths that previous exploration has tested. A second target zone has also been identified, dipping westward and running parallel with the bedding planes of the host rock — a geometry that could indicate a structurally controlled tabular body of meaningful scale.

The Horseshoe deposit tells a similar story. The survey has imaged a tabular body with continuations both up and down dip beneath surface cover, with thicknesses estimated at 20 to 40 metres. Separately, a potential steep feeder structure has been identified running through the Saw Mill Thrust and extending beyond 200 metres in depth. Feeder structures are significant because they can represent the conduits through which mineralising fluids migrated, and their identification strengthens the geological framework for understanding where to drill.

The Corridor Connecting the Deposits

Perhaps the most strategically significant finding relates to the 8-kilometre fertile corridor that runs through the heart of Quinn Canyon. CSAMT imaging of the Spar to Big Jim to North Horseshoe Canyon zone has strengthened the geological link between multiple prospects by identifying the prospective Saw Mill Thrust horizon beneath the lithocap — a hydrothermally altered zone typically associated with mineralising systems. Additionally, a deeper source intrusive body has been imaged, with its contacts providing additional targeting opportunities. This suggests that what has been mapped at surface across several separate high-grade occurrences may represent a single large mineralising system at depth.

Sector Context

Fluorspar is classified as a critical mineral by the United States, European Union, and Australia due to its essential role in Manufacturing hydrofluoric acid, aluminium fluoride, Lithium-Ion Battery electrolytes, and refrigerants. Global Supply is heavily concentrated in China and Mexico, creating strategic interest in developing alternative sources in politically stable jurisdictions. Nevada, with its established Mining infrastructure and permissive regulatory environment, is a logical location for new fluorspar development.

OD6's Quinn project sits in this context as one of relatively few advanced fluorspar exploration projects in North America. The ability to demonstrate depth extent — rather than just surface occurrence — would materially enhance the project's perceived scale and its attractiveness to potential Downstream partners or acquirers with offtake interests in securing supply.

Risks

CSAMT results require geological verification and, ultimately, drilling confirmation before they carry resource-definition weight. The resistive anomalies identified may represent silicified limestone or other non-fluorspar lithologies rather than economic CaF2 mineralisation. Pre-drilling interpretation of geophysical data carries inherent uncertainty, and the maiden drill program in early 2027 will be the true test of whether the depth targets translate to drillable mineralisation.

Nevada operations also carry regulatory and permitting requirements, and any delays to the 2027 drilling schedule could affect the company's ability to advance the project within its current funding envelope. The fluorspar market, while underpinned by critical mineral Demand drivers, remains subject to pricing fluctuations tied to industrial output cycles.

What to Watch Next

The integration of CSAMT results into OD6's updated geological models and drill targeting framework will be the immediate focus. The company's maiden drilling campaign — planned for early 2027 — is the most significant upcoming catalyst, as it will provide the first downhole tests of both the known high-grade surface mineralisation and the deeper structural targets identified through geophysics. Any pre-drilling news around target ranking, drill rig contracting, or permitting milestones will also serve as indicators of progress toward that program.