OD6 Metals (ASX: OD6) Expands the Interpreted Mammoth Fluorspar Target at Quinn, Nevada, by More Than Half
Updated: 2 hours ago
OD6 Metals has remapped and resampled the Mammoth prospect at its Quinn Fluorspar Project in Nevada. The interpreted target has grown from about 9,000 square metres to more than 14,000. OD6 now describes Mammoth as a bulk tonnage target, a different style to the very high grades it has reported at Horseshoe and Big Jim. All of it is surface work, and Mammoth has not been drilled.
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Samso has followed OD6 Metals since it took an option over the Quinn Fluorspar Project in March 2026. Most of what has come out of Quinn since has been about grade. Horseshoe channel sampling averages 74.8% calcium fluoride across 120 samples after an August re-assay, and Big Jim carries historical assays above 90%. [R8] [R5] Mammoth has always been the lower-grade of the three.
The announcement of 7 September 2026 is about area rather than grade. [R1] OD6 has remapped Mammoth, put the interpreted footprint at more than 14,000 square metres against the roughly 9,000 it presented in April, and released channel sampling from eight benches.
The Announcement
OD6 Metals Limited (ASX: OD6) released assays from mapping, channel sampling and rock chip sampling at Mammoth on 7 September 2026. The release is on the company website and on the ASX announcements platform. [R1]
Mammoth is one of seven prospect areas making up the Quinn Fluorspar Project, in Nye and Lincoln Counties in central Nevada, about 220 kilometres north of Las Vegas. OD6 holds 226 mining claims, the unit of tenure on United States federal land, over about 1,890 hectares, and owns the project outright after completing the acquisition in August 2026. [R6] FIG. 01 shows the claim blocks and the named prospects.
Fluorspar is the commercial name for fluorite, a calcium fluoride mineral, and grades are quoted as CaF₂ per cent. It is the feedstock for hydrofluoric acid, which goes into refrigerants, aluminium smelting, semiconductor etching and uranium processing. The United States was 100% net import reliant for it in 2025, with no significant US mine production reported since 1995. [R9]
FIG. 01 The Quinn Fluorspar Project claim position in Nye and Lincoln Counties, Nevada, with the seven claim areas outlined in red and the known fluorspar occurrences marked. Mammoth is the northernmost of them. Company map reproduced from a public ASX release, with attribution. OD6 Metals Limited, 7 September 2026, Figure 3 [R1].
Highlights, as Reported
These are the company's figures, drawn from the 7 September release. [R1]
The interpreted footprint has grown from about 9,000 square metres to more than 14,000, and as 14,300 in the body text.
A breccia and stockwork system, meaning shattered rock and a dense network of small veins, is mapped for more than 300 metres at surface and up to about 100 metres across.
It is open east beneath talus, the loose broken rock at the base of a slope, and open north, where it appears to run beneath a hard silica-altered cap. A southern tail mapped by Evans in 1975 has not been found in outcrop. [R7]
Channel sampling across eight benches is in Table 01. The best single assay was 85.9% CaF₂, and rock chips ran to 78.3% and 54.5%.
OD6 calls Mammoth a priority drill target. It puts US acidspar at US$654 per tonne in July 2026, up about 29% over three quarters, sourced to ChemAnalyst.
FIG. 02 plots every channel and rock chip result on the mapped geology, with the individual bench intercepts labelled.
FIG. 02 Channel sampling and rock chip results at Mammoth, plotted on the mapped geology. Circles are bench channel samples and squares are rock chips, both coloured by CaF₂ grade. The pink area is the interpreted fluorspar zone. Company map reproduced from a public ASX release, with attribution. OD6 Metals Limited, 7 September 2026, Figure 1 [R1].
Where Mammoth Fits Against the Rest of Quinn
In April 2026, Samso reported one channel result from Mammoth, 12 metres at 40.8% CaF₂, with a mapped zone of about 9,000 square metres. [R3] That interval is the Middle3 bench, now 42.0% after re-assay and still the best bench in the set.
The new work covers eight benches rather than one, and the picture is wider and lower in grade. Seven of the eight average between 13.2% and 24.1% CaF₂. The release describes the sampling as covering a broad zone with widely spaced samples, so the lower averages reflect how much ground was covered rather than a change in the April result.
OD6 calls Mammoth a different target style to Horseshoe and Big Jim, and its potential bulk tonnage source. The difference is grade rather than width. Horseshoe is a broad zone too, 80 metres wide at surface over a body the company puts at 15 to 30 metres thick, and its 120 channel samples average 74.8% CaF₂. [R8] Mammoth is the larger mapped area at much lower grade. FIG. 03 shows the fluorspar zones, the eight benches and the three open directions.
FIG. 03 The full Mammoth target area, showing the interpreted 14,000 square metre fluorspar footprint and the three directions the company describes as open. Two arrows mark ground open under talus cover, one marks the plunge beneath the limestone cap, and the southern tail is annotated as obscured and projected from Evans, 1975. Company map reproduced from a public ASX release, with attribution. OD6 Metals Limited, 7 September 2026, Figure 2 [R1].
What the Release Does Not Settle
The headline intercept of 44 metres at 29% CaF₂ is two benches added together rather than one continuous channel. The release gives the components as 32 metres at 24.1% on Middle4 and 12 metres at 42.0% on Middle3, and lists them separately in its own table. Length-weighting the two gives 29.0%, which is Samso's arithmetic and matches the reported figure. The highlights carry the 44 metres without those two figures beside it, and quote four of the eight intercepts, the three left out being the lowest in the set.
These are surface channel samples cut across excavated benches, not drill intercepts. A width measured across a bench face is not a true thickness and says nothing about how far the mineralisation goes down. OD6 interprets the body as steeply dipping, in a dilational zone where two strike-slip faults pull the ground apart. [R1] That is a reason to expect depth rather than a measurement of it. There has been no drilling at Mammoth and no JORC Mineral Resource anywhere at Quinn. A footprint is an area, and without a depth no tonnage follows from it.
OD6 cites US$654 per tonne for US acidspar in July 2026, from ChemAnalyst data it accessed on 5 August 2026. [R8] Samso reported around US$560 per tonne in June 2026, also from an OD6 announcement. [R5] Both are quoted as published.
Leadership Commentary
Managing Director Brett Hazelden addressed scale rather than grade.
"The key takeaway from these latest results is scale. Detailed mapping and sampling have increased the interpreted Mammoth target footprint by more than 50%, from approximately 9,000m² to >14,000m², with a mineralised breccia and stockwork system extending for more than 300 metres and remaining open beneath cover."
Brett Hazelden, Managing Director, OD6 Metals Limited [R1]
He also said the next step is drilling, and that drilling will begin to establish the true scale of Mammoth. No drilling date is given in the release.
Near-term Milestones to Watch
A maiden drill programme at Mammoth, for which no date has been given.
Metallurgical and ore sorting testwork aimed at metspar and acidspar products, which OD6 says is running.
Permitting. Environmental baseline and archaeological studies are running, with drilling and bulk sampling approvals in preparation.
Further results from Horseshoe and Big Jim, which carry the high grades.
US federal programs. OD6 registered on SAM.gov on 1 September 2026 and says it will assess Defense Logistics Agency and other federal pathways as Quinn advances. [R9]
Samso Concluding Comments
In my opinion, OD6 is building two arguments at Quinn and this announcement belongs to the second one. Horseshoe and Big Jim are the grade story. Mammoth is the tonnage story, measured in area and continuity rather than peak assays.
On that measure the release does what it says. The footprint is bigger and the sampling covers eight benches instead of one. All of it is still at surface. There is no resource, no cash flow and no production, and OD6 remains an exploration company doing exploration work.
Drilling Mammoth, testing Horseshoe at depth, running metallurgy and permitting are four calls on one balance sheet, and OD6 also has a rare earth project and a copper project.
Previous Samso Coverage of OD6 Metals
Samso has written on OD6 Metals since October 2022, and on the Quinn Fluorspar Project since the option was taken in March 2026. Every piece is listed below, newest first, so the whole thread can be read in order. The three entries marked in gold are Coffee with Samso interviews rather than written pieces.
The Quinn fluorspar thread, 2026
5 AUGUST 2026
Ownership moves from option to outright. The 226 claims, the seven prospect areas and what A$200,000 actually bought.
14 JULY 2026
Horseshoe channel results and the soil geochemistry that opened up an 8 kilometre mineralised corridor.
21 JUNE 2026
Impurities and product specifications. Where Quinn material lands against metspar and acidspar, and against producers overseas.
28 MAY 2026
The historic Union Carbide drilling and metallurgical records, including the Mammoth testwork quoted in this article.
19 MAY 2026
The rediscovery of the Big Jim lode, the third high-grade system at Quinn, and the 1947 record behind it.
17 APRIL 2026
The first modern field work in about 60 years. The April Mammoth and Horseshoe channel results, including the 12 metres now re-assayed at 42.0% CaF₂.
COFFEE WITH SAMSO 4 APRIL 2026 OD6 Metals Explains US Critical Minerals Opportunity with Quinn Fluorspar Project Brett Hazelden and Dr Darren Holden on why the company moved into fluorspar. |
18 MARCH 2026
Julie Bishop & Partners appointed as strategic advisers, and what that says about the policy doors OD6 is aiming at.
16 MARCH 2026
Additional claims staked over the strike extensions of six historical deposits, Mammoth among them.
9 MARCH 2026
The pivot into fluorspar. The option terms, the historical workings and why the United States cares about this mineral.
Earlier coverage, the rare earth and copper years
COFFEE WITH SAMSO 9 NOVEMBER 2025 Splinter Rock heap leach metallurgy and the Gulf Creek copper project in New South Wales. |
10 SEPTEMBER 2025
The onsite chlor-alkali plan that would take an 800 kilometre acid haul out of the Splinter Rock flowsheet.
COFFEE WITH SAMSO 26 OCTOBER 2022 OD6 Metals Limited (ASX: OD6) The Rare Earth Elements Story Episode 158, the first Samso conversation with OD6, on the Goldfields-Esperance clay rare earth projects. |
The Vocabulary, in Plain English
References and Sources
Figures reproduced in this article are the company's own maps from the public ASX release, credited in each caption. Where the company's documents give two different figures for the same thing, both are quoted as published and the document each came from is named. This article does not attempt to resolve them. Where Samso does its own arithmetic on company figures, it is labelled as Samso's calculation. Market-sensitive figures are stated as at the dates given.
[R1] OD6 Metals Limited, "Mammoth Fluorspar Target Extends by Over 50%", ASX announcement, 7 September 2026.
[R2] OD6 Metals Limited, Mammoth channel sampling, ASX announcement, 9 April 2026, referred to in [R1].
[R3] Samso, "OD6 Metals, Developing The Quinns Fluorspar Begins in Earnest", samso.com.au, 17 April 2026.
[R4] Samso, "OD6 Metals Limited (ASX: OD6), Quinn Fluorspar Builds the Grade and Processing Case in Nevada", samso.com.au, 28 May 2026.
[R5] Samso, "OD6 Metals (ASX: OD6): Nevada's Quinn Delivers High-Grade Fluorspar Cleaner Than Global Peers", samso.com.au, 21 June 2026.
[R6] Samso, "OD6 Metals (ASX: OD6) Completes Acquisition of District-Scale High-Grade Quinn Fluorspar Project in Nevada", samso.com.au, 5 August 2026.
[R7] Evans, D.L.C. (1975). "Geology and Indicated Reserves, Quinn Canyon Range Fluorspar". Consultant report on file, Nevada Bureau of Mines and Geology. Cited in [R1].
[R8] OD6 Metals Limited, "Horseshoe Channel Re-assays Confirm Materially Higher Grade Fluorspar From Surface", ASX announcement, 25 August 2026.
[R9] OD6 Metals Limited, "OD6 Positions Quinn for US Federal Critical Minerals Programs", ASX announcement, 1 September 2026.
Cover image: AI-generated illustrative Basin and Range landscape, made for Samso. It is not a photograph of the Quinn project.
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