OD6 maps deeper fluorspar potential across Nevada project

Mammoth target reaches beyond 500 metres

OD6 Metals Limited (ASX:OD6) has used a deep-imaging survey to outline a potentially much larger fluorspar system at its Quinn project in Nevada, with the most substantial target sitting beneath the Mammoth deposit. The company says modelling of a highly resistive body indicates that the steeply dipping breccia zone exposed at surface may continue more than 500 metres vertically.

“3D View of the CSAMT survey and modelling results.”

“Section L500 CSAMT line through Mammoth”

Caption and image © Od6 Metals Limited. From “GEOPHYSICS REVEALS EXTENSION POTENTIAL”, 28 Oct 2026.

The result comes from 16.8 line kilometres of Controlled Source Audio Magneto-Tellurics, or CSAMT, collected across nine lines and 344 stations. The work was independently inverted by KLM Geoscience and Wright Geophysics, with the latter providing confidence in the models to about 500 metres depth. Mammoth’s known surface mineralisation has previously returned grades of 20% to 40% calcium fluoride, or CaF2, but this announcement reports no new assays or resource estimate.

Horseshoe horizon extends beneath cover

At Horseshoe, the survey traced a shallow-dipping resistive zone beneath talus cover for about 300 metres, implying potential up-dip and down-dip continuity across roughly 500 metres with an interpreted thickness of 20 to 40 metres. A separate steeply dipping resistive feature beneath the northern part of the pit is interpreted as a possible feeder structure passing through the Saw Mill Thrust to more than 200 metres depth.

“Section L200 from Horseshoe to the NE, indicating Feeder zone, source intrusives and the around the Lithocap.”

“The identification of this prospective structural horizon beneath the Lithocap provides an important geological link between previously identified high-grade fluorspar…”

Caption and image © Od6 Metals Limited. From “GEOPHYSICS REVEALS EXTENSION POTENTIAL”, 28 Oct 2026.

That interpretation gives the company a clearer structural target between several known occurrences. The Saw Mill Thrust was imaged beneath the altered Lithocap and is presented as the prospective horizon linking Horseshoe, North Horseshoe Canyon and Big Jim. A previous link is not applicable; instead, OD6’s proposed 10,000-metre drill plan had already outlined a maiden drilling and bulk-sampling campaign at Quinn, making the new survey relevant chiefly because it can help refine where those holes are placed.

Geophysics adds concealed targets

At Big Jim, a strong resistive alteration zone more than 200 metres high lies beneath the high-grade surface occurrence and is inferred to relate to calcium-fluoride-bearing footwall breccias. The survey also maps source intrusive rocks beneath the Lithocap, with their contacts providing additional targets between North Horseshoe Canyon and Big Jim. Fluorspar occurrences appear to cluster within resistive volumes or along resistivity gradients, according to OD6’s interpretation.

“Section L400 from north of NW to Horseshoe through the Lithocap to Rocket and Big Jim.”

“Section L000 at Dress Circle”

Caption and image © Od6 Metals Limited. From “GEOPHYSICS REVEALS EXTENSION POTENTIAL”, 28 Oct 2026.

The Dress Circle area adds a separate exploration angle. CSAMT identified both highly resistive and non-resistive zones in an area where soil sampling had indicated gold, gold-pathfinder and some fluorine anomalism. OD6 says the combination may support the presence of intrusive or epithermal gold-related features, although those targets also require field investigation.

Drilling remains the decisive test

“Map view of resistivity survey with prospect locations and transparent geology.”

CSAMT measures electrical resistivity rather than fluorspar directly. Resistive signatures may reflect fluorspar, silicification or altered limestone, while conductive zones may relate to clay alteration or intrusive rocks. The company explicitly says the interpretations require geological verification and drilling, and notes that the data are not sufficient for mineral resource estimation.

OD6 plans to integrate the survey with mapping, surface sampling and structural interpretation before prioritising targets. It is also continuing United States Forest Service permitting and operational preparations for proposed early-2027 drilling and bulk sampling at Horseshoe and Mammoth. The timing therefore leaves a clear gap between an encouraging subsurface model and evidence of economic mineralisation: the next campaign must show whether the large resistive bodies contain continuous, mineable fluorspar rather than merely the rocks that can accompany it.