OD6 Metals Expands Nevada Fluorspar Target 50% as Drilling Looms
Key Takeaways
- Revised geological mapping and channel sampling have expanded the Mammoth fluorspar target by more than 50%, from approximately 9,000m² to over 14,000m², with the mineralised breccia and stockwork system extending across 300 metres of strike.
- Channel sampling across five benches returned wide, continuous fluorspar intercepts, including 12m at 42.0% CaF₂ (peak 58.4%) and 32m at 24.1% CaF₂ (peak 54.0%), with rock chip samples reaching 78.3% CaF₂.
- Mineralisation remains open in three directions — east beneath talus cover, north beneath a silicified limestone cap, and south where a 1975 historical programme identified an untested extension — making each a distinct drill target.
- Acidspar prices rose approximately 29% over three quarters to US$654/t in July 2026, reinforcing the commercial backdrop for a US-based fluorspar project given the country's 100% import reliance on the critical mineral.
- Drilling at Mammoth is the next priority catalyst, designed to test geometry, depth extent, and grade continuity across the three open extensions within OD6's 100%-owned, 8km mineralised Quinn corridor in Nevada.
Mammoth target grows beyond 14,000m² as OD6 advances its Nevada fluorspar ambitions
Revised geological mapping and channel sampling have expanded the Mammoth fluorspar target by more than 50%, growing the interpreted footprint from approximately 9,000m² to more than 14,000m² (14,300m² per the appendix). The mineralised system is defined as a breccia and stockwork zone extending over 300 metres of strike and up to approximately 100 metres across, with mineralisation remaining open in multiple directions beneath cover.
OD6 Metals (ASX: OD6) holds the Mammoth target within its Quinn Fluorspar Project in Nevada, a state ranked 2nd globally in the Fraser Institute 2025 Mining Attractiveness Index. The strategic backdrop is significant: the United States remains 100% net import reliant on fluorspar, a mineral firmly established on the US Critical Minerals list. Drilling is planned as the next step, designed to test the geometry, depth extent, grade continuity, and true scale of the system.
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What the latest sampling reveals across Mammoth’s exposed benches
Channel sampling was conducted across multiple excavated benches at Mammoth, returning wide, continuous intervals of fluorspar mineralisation. Channel sampling is a systematic technique where representative samples are collected at fixed intervals along a pit wall or bench face, delivering a reliable measure of grade across the sampled interval.
The headline intercepts across five key benches are summarised below.
| Bench | Intercept (m) | CaF₂ (%) | Includes | Max CaF₂ (%) |
|---|---|---|---|---|
| Middle3_Bench | 12m | 42.0% | — | 58.4% |
| Middle4_Bench | 32m | 24.1% | 22m @ 31.3% | 54.0% |
| Upper1_Bench | 22m | 20.1% | 12m @ 27.9% | 85.9% |
| Upper2_Bench | 33m | 15.2% | 3m @ 22.1% | 36.4% |
| Lower1_Bench | 15m | 20.5% | 14m @ 21.2% | 30.0% |
Complementing the channel results, rock chip sampling returned two standout individual assays:
- 78.3% CaF₂ (sample DH112) — intense purple fluorspar
- 54.5% CaF₂ (sample JN004) — breccia limestone with fluorspar
It is worth noting that Middle3_Bench results were previously reported in April 2026 but have since been re-assayed using the F-XRF24 method, which OD6 considers more reliable for higher-grade fluorine mineralisation. This re-assay is a quality validation step, not a restatement of new ground.
The system remains open in several directions: to the east beneath talus cover, to the north where it appears to plunge beneath a silicified limestone cap, and to the south where a historical mapping programme (Evans, 1975) identified an extension that remains untested by drilling.
Managing Director Brett Hazelden
“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.”
Understanding fluorspar and why Mammoth’s bulk-tonnage style matters
Fluorspar is the commercial name for calcium fluoride (CaF₂), a mineral with two primary commercial grades. Metspar is the lower-grade industrial product; Acidspar exceeds 97% CaF₂ and commands a premium price because it is the feedstock for hydrofluoric acid. Fluorspar is essential for hydrofluoric acid production, AI semiconductor manufacturing, advanced batteries, uranium enrichment, defence systems, and refrigerants — industries that sit at the centre of the current US critical minerals policy agenda.
Acidspar prices increased by approximately 29% over the preceding three quarters to US$654/t in July 2026, according to ChemAnalyst, reflecting tightening global supply conditions.
The Mammoth deposit is interpreted as a breccia/stockwork system. In plain terms: a breccia is a rock composed of broken fragments cemented together, and a stockwork is a network of veins penetrating the host rock in multiple directions. What makes this significant is scale and continuity. Rather than a narrow, high-grade vein that can be difficult and expensive to mine selectively, wide intervals of continuous mineralisation across multiple exposed benches are consistent with a bulk-tonnage-style target, where larger volumes of material are processed at moderate grades. That is a fundamentally different economics proposition.
This distinguishes Mammoth from the nearby Horseshoe and Big Jim prospects. Those targets represent ultra-high-grade, potentially narrower-style mineralisation. The two target styles are positioned as complementary within the Quinn system: Horseshoe and Big Jim provide high-grade optionality, while Mammoth offers potential scale.
Horseshoe prospect results have already returned fluorspar grades exceeding 75% CaF2, placing that target firmly in ultra-high-grade territory and providing a sharp contrast to Mammoth’s wider, bulk-tonnage-style mineralisation across the same Quinn system.
The US strategic context reinforces why this matters. Fluorspar is classified as a US Critical Mineral. The US imports 100% of its domestic consumption, with more than 60% of global supply sourced from China. A domestic, high-quality source in Nevada directly addresses that dependency.
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Quinn Project’s strategic position and what comes next for OD6
Quinn is shaping up as a district-scale fluorspar system: an 8km mineralised corridor across 226 mining claims covering approximately 1,890 hectares, 100% owned by OD6, with more than 20 fluorspar occurrences identified. The project’s key attributes for investors include:
- Nevada location, ranked 2nd globally in the Fraser Institute 2025 Mining Attractiveness Index
- An 8km fertile mineralised corridor with additional high-grade fluorine anomalies identified outside known deposits
- Low impurity mineralisation, providing encouraging characteristics for Metspar and potential Acidspar grade (>97% CaF₂) products
- Metallurgical testwork advancing, with optical sorting and beneficiation studies underway to optimise premium product recoveries
- Permitting programme underway, including environmental baseline, archaeological studies, and preparation of drilling and bulk sample approvals
Drilling at Mammoth is the priority next catalyst, planned to test geometry, depth extent, and grade continuity across the three open extensions to the east, north, and south. Each extension represents a distinct drill target in the next phase of work.
The identification of high-priority drill targets at Quinn through soil geochemical anomalies has helped define which extensions and corridors within the 8km mineralised system represent the strongest candidates for the upcoming drill programme.
Managing Director Brett Hazelden
“Together with the exceptional grades already demonstrated at Horseshoe and Big Jim, Mammoth adds another dimension to Quinn and further strengthens our view that we are dealing with a significant district-scale fluorspar system in Nevada.”
OD6 Metals (ASX: OD6) is an Australian critical minerals explorer with projects spanning fluorspar (Quinn, Nevada), rare earths (Splinter Rock, Western Australia, with an Indicated Resource of 119Mt @ 1,632ppm TREO and an Inferred Resource of 563Mt @ 1,275ppm TREO), and copper (Gulf Creek, New South Wales). The company’s stated aim is to position itself as an emerging supplier of strategically important critical minerals for next-generation industrial, defence, and energy technologies.
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