High priority targets have been refined and the potential scale of mineralised system has been expanded by the recent geophysics at OD6 Metals’ (ASX OD6) Quinn Fluorspar Project in Nevada, ahead of the upcoming maiden drilling campaign that will drill 10,000m across as many as 139 drill pads at the project’s most exciting prospects. The CSAMT survey has taken the geological structures associated with mineralisation and matched them to resistivity anomalies that begin at surface and extend beyond 500m beneath Mammoth, alongside around 500m of combined up and down dip potential at Horseshoe. Horseshoe has already delivered surface channels of 50m at 79.3% CaF₂ and historic drilling of 14.3m at 70.9% CaF₂, while Mammoth’s recently expanded footprint that exceeds 14,300m2 includes adjacent channels that returned 44m at 29% CaF₂. The new survey traces prospective structures beneath these exposures and across the 1.5km Horseshoe-Big Jim corridor, where rock samples have reached 99.9% CaF₂. Big Jim has also returned 14m at 93.7% CaF₂ along the exposed vein, including 12m at 95.9%, while a new rock chip from nearby Rocket assayed 99.9% CaF₂, and Blue Bell has added 24m at 51.1% CaF₂ from surface channels, with follow up sampling extending its prospective trend to 350m. The Las Cuevas mine in Mexico is also utilising TOMRA sorting, which supports the processing route being evaluated at Quinn – and a 1,000kg bulk sampling program will soon get underway to build on the results from the recent 166kg, multi prospect testing. The company has $8.7 million in cash and is fully funded for early 2027 drilling after banking a $6.92 million placement – which was priced at $0.095/share – with the current share price of $0.073 and implied $26.84 million market cap offering an opportune time to enter the company in the lead up to its highest impact newsflow period. Fluorspar prices continue to trade upwards, reaching over US$680/t domestically in America as OD6 has gained membership of the US defence consortium and prepares to test how much of Quinn’s exceptional surface mineralisation continues at depth, which will coincide with a rebranding to the new name of Adaven (ASX: ADA).
The broadening of Mammoth’s resistive structures below its mapped breccia and stockwork mineralisation outlines a depth extension of strong potential beyond 500m, as well as a separate target along the western bedding contact. The 16.8 line kilometre CSAMT survey covered nine lines, and the highly resistive core has been interpreted largely as silicification, with fluorspar potentially concentrated around its margins – and combining those boundaries with surface channels like 44m at 29% CaF₂ gives drilling specific mineralised contacts to follow into the deeper structure.
Horseshoe produced similarly exciting data but with a shallow replacement body that appears to continue for around 300m down dip beneath talus, boosting strike at this prospect to over 500m with a modelled thickness of 20 to 40m. A steep potential feeder crosses the Saw Mill Thrust and extends beyond 200m in depth beneath the historic pit, with earlier drilling returning 14.3m at 70.9% CaF₂ from surface before mining exposed the high grade core and produced approximately 26,000t of fluorspar.
North Horseshoe Canyon has returned rock chips of 57.3% and 51% CaF₂ across a 100m exposed zone, while a separate outcrop 150m farther south returned 60% CaF₂ – and the entire NHC mineralised structure is interpreted to continue 750m northeast beneath cover towards Big Jim. Geophysics now traces the prospective Saw Mill Thrust horizon through this covered corridor, and identifies an alteration zone extending more than 200m vertically below Big Jim’s vein and mineralised footwall breccia. Intrusive contacts provide additional targets, while resistivity contrasts near Dress Circle’s gold and pathfinder soil anomalies will guide further mapping and sampling.
Seven consecutive 2m channel samples at Big Jim averaged 93.7% CaF₂, with six above 93% and the lowest returning 80.6%. The 14m represents the sampled length along the exposed vein which is roughly 2m thick and dips shallowly west beneath the Saw Mill Thrust jasperoid. Systematic sampling provides stronger evidence of grade continuity over this exposure than the earlier selective rock chips, and drilling will test its continuation beneath cover. A new rock chip from Rocket’s upper lode, 150m west of Big Jim, returned 99.9% CaF₂. Alongside Big Jim’s previously reported 98.3% CaF₂ metallurgical head grade and preliminary TOMRA separation results, these grades support further assessment of potential direct shipping metspar feed, with bulk sorting performance to be tested in the upcoming programs and the scale and continuity of mineralisation assessed through drilling.
The head grades of ore sampled at the main prospects at Quinn have met the product requirements for Metspar and Acidspar before even being upgraded, with very low levels of deleterious elements such as arsenic, cadmium, base-metals, sulphur or uranium, as well as gangue material. The initial grades have been impressive with 98.3% CaF₂ at Big Jim, 90% and 76.2% at Horseshoe, 86.7% at Blue Bell and 40.4% at Mammoth, from 11 samples totalling 166kg of material used in the TOMRA ore sorting program.
At the operating Las Cuevas mine, its owner Koura produces metspar and acidspar and uses TOMRA Color sorters to remove carbonate waste, along with two XRT units to reject silica as well. These gangue minerals also occur at Quinn, and the TOMRA work completed so far has already distinguished mineralised material from selected dilutive and waste samples at Horseshoe, Big Jim and Blue Bell. At Big Jim, the tests distinguished the main vein from limestone clasts in the mineralised footwall and barren hanging wall material. Mammoth’s quartz and fluorite responses were less distinct, with heavy media separation and flotation under assessment. Larger 500kg to 1,000kg trials will now quantify mass rejection, grade uplift and recovery, testing whether coarse sorting can reduce the tonnes transported and processed from satellite deposits.
Resistivity outlines the interpreted breccia extension below Mammoth, and a separate western contact target:
Source: OD6
Shallow extensions and a potential feeder beneath Horseshoe give drilling distinct targets around the historic workings:
Source: OD6
Big Jim’s 14m at 93.7% CaF₂ channel along the exposed vein and Rocket’s new 99.9% CaF₂ rock chip 150m west are shown below, alongside the mapped mineralised structures and historic workings:
Source: OD6
Surface sampling that has extended the highly prospective Blue Bell and Shannon Queen trend to 350m can be seen below:
Source: OD6
TOMRA’s XRT technology assesses individual particles before compressed air jets separate the material into two streams, allowing waste rejection ahead of downstream processing. A simple schematic of the process can be seen below:
Source: TOMRA
Big Jim’s Laser and XRT tests distinguished vein material from selected dilutive footwall clasts and hanging wall waste, with the broader footwall breccia sample assaying 27.8% CaF₂:
Source: OD6 and TOMRA
Quinn now combines exceptional surface grades, historic production and drilling, preliminary processing testwork and geophysical targets extending well beyond the known exposures. Horseshoe offers extensions around a mined high grade body, while Mammoth’s deeper structure adds substantial scale potential. With funding secured, drilling approval is the next catalyst ahead of the early 2027 campaign that will begin testing those dimensions – which could put OD6 on the path to being one of America’s next critical minerals projects to consider fast track development.
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