OD6 Metals has pinpointed the historically noted Big Jim Fluorspar Lode within its Quinn Project, revealing grades up to 98.6% CaF2 and defining a new, substantial drill target in a district-scale system.
- Big Jim lode rediscovered with historic grades up to 98.6% CaF2
- Extensive historic workings mapped over 220m, system open-ended
- Metallurgical testwork underway to refine processing methods
- Discovery complements Mammoth and Horseshoe deposits at Quinn
- Drilling and permitting planned to validate and expand resource
Historic High-Grade Big Jim Lode Comes Back into Focus
OD6 Metals (ASX:OD6) has reignited interest in its Nevada Quinn Fluorspar Project with the rediscovery of the Big Jim Fluorspar Lode, a historically documented high-grade vein that boasts some of the highest fluorspar grades recorded in the district. Visual estimates from surface outcrops suggest an extraordinary 98.6% CaF2 purity in the massive purple fluorspar vein, surpassing grades reported at the nearby Mammoth and Horseshoe prospects. Historic workings extend over 220 metres, with the system remaining open both north and south, underscoring significant upside potential.
The rediscovery was achieved through meticulous field reconnaissance combined with archival geological detective work tracing back to US Geological Survey reports from the mid-20th century. The Big Jim lode, originally mined intermittently since the 1930s, was historically reported with vein widths around 2 metres and grades consistently above 90% CaF2, with some samples reaching 98.6%. These figures dwarf many contemporary fluorspar deposits and position Big Jim as a standout target within OD6's growing portfolio.
Expanding a District-Scale Fluorspar System
Big Jim sits roughly 1 kilometre north-northeast of the Horseshoe deposit and adds a third major system to OD6’s Quinn Project, which already features the high-grade Mammoth and Horseshoe deposits. This discovery complements recent assay results from Horseshoe, where channel samples returned up to 82% CaF2, and Mammoth, which has shown grades exceeding 53% CaF2, reinforcing the project's potential as a significant domestic fluorspar source for the US market. The Quinn Project’s strategic location approximately 220 kilometres north of Las Vegas places it within reach of the US Strategic Minerals Reserve at Hawthorne, Nevada.
OD6 is advancing metallurgical testwork on Big Jim samples to optimise processing flowsheets involving optical sorting, crushing, grinding, and flotation. This work aims to confirm the amenability of the ultra-high-grade material to cost-effective beneficiation, a critical step given fluorspar’s role in battery technologies, AI chip manufacturing, and nuclear fuel processing. The company’s approach aligns with the US government’s focus on securing critical minerals domestically amid rising geopolitical tensions and supply chain vulnerabilities.
Next Steps Towards Drilling and Resource Definition
With assay results from newly collected rock samples pending at ALS Global’s Reno laboratory, OD6 is preparing for a maiden drilling campaign targeting the Big Jim lode’s shallow westerly dip geometry. The company plans to digitise historic data, conduct detailed geological and structural mapping, expand channel and rock chip sampling, and initiate permitting processes through the US Forest Service, as the project lies on federal land outside designated wilderness study areas.
This methodical build-out follows OD6’s recent acquisition of a valuable historical dataset from Union Carbide, which has accelerated resource modelling and exploration efficiency at Quinn. The integration of this data with ongoing field programs is expected to sharpen drill targeting and enhance confidence in resource estimates, potentially fast-tracking the project’s development timeline. The Quinn Project’s fluorspar system now stands as one of the most promising high-grade domestic sources in the US, a country currently 100% reliant on imports for this critical mineral.
OD6’s Managing Director Brett Hazelden emphasised the significance of the find, stating, “Big Jim perhaps is our highest-grade target to date. This discovery validates our ambition to be a US-based high-grade fluorspar developer coinciding with increasing strategic demand for US domestic supply.”
Broader Portfolio and Strategic Positioning
Beyond fluorspar, OD6 is advancing its rare earths project at Splinter Rock in Western Australia, which hosts one of the country's largest clay-hosted rare earth deposits, and its Gulf Creek copper-zinc project in New South Wales. The company’s diversified critical minerals portfolio reflects a strategic push into minerals essential for emerging technologies and decarbonisation efforts.
The Big Jim rediscovery builds on recent announcements of ultra-high-grade fluorspar results and strategic advisory appointments, positioning OD6 as a rising player in the US critical minerals space. The company’s next challenge will be to convert these historic and visual indications into a robust, JORC-compliant resource through systematic drilling and metallurgical validation, a process already underway with the integration of the historical dataset acquisition and the recent ultra-high-grade fluorspar grades reported at Horseshoe.
Bottom Line?
OD6’s Big Jim rediscovery could redefine US fluorspar supply, but assay results and permitting will be crucial to unlocking its full potential.
Questions in the middle?
- Will assay results confirm the exceptional grades suggested by historic data and visual estimates?
- How quickly can OD6 secure drilling permits on federal land to advance resource definition?
- What metallurgical challenges might arise in processing the footwall breccia material historically labeled as 'gangue'?