U.S. Critical Minerals Expansion
Gillham Antimony Silver Project
100% Owned | 5,000 acres
Gillham Antimony Silver Project
The Gillham Project is a high-grade, district-scale antimony, silver and polymetallic system located in southwest Arkansas, USA. The project comprises approximately 5,000 acres and hosts multiple historical workings, including the Stewart and Davis mines, within a well-defined mineralised corridor.
Recent modern exploration has confirmed Gillham as a high-priority, drill-ready project, with strong geochemical anomalies, high-grade surface samples and multiple coherent targets defined across a significant strike extent.
Pantera secured approximately 5,000 acres of highly prospective antimony and silver exploration ground in southwest Arkansas, a jurisdiction where antimony is designated a critical mineral by the U.S. Government, covering the Gillham East and Gillham West Project areas.
The district hosts more than 18 historic mines yet has seen no systematic exploration for nearly 100 years and aligns directly with U.S. policy priorities around domestic critical minerals supply.
First Modern Exploration Framework
Seven Drill Targets Defined
Comprehensive geological and structural interpretation defined seven priority drill targets across the Gillham Project:
- Five targets at Gillham East, aligned with historic antimony workings
- Two targets at Gillham West, including 5km structural corridor hosting the Davis silver-base metal mine.
This work established the first modern exploration framework ever applied to the district and provided a clear pathway toward initial drilling and follow up exploration.
Gillham East, Interpretation and Targets
Latest Exploration Results
ASX Announcement – 24 March 2026
Pantera has completed the first modern exploration program at Gillham, delivering high-grade antimony and polymetallic results that validate the project’s potential and support imminent drilling.
Key results include:
- High-grade antimony rock chips up to 3.92% Sb, with associated silver and lead.
- Additional results including:
- 1.1% Sb, 6 g/t Ag, 1.32% Pb
- 4.79% Pb, 20.5 g/t Ag
- 1.96% Cu, 1.46% Zn
- Newly identified gold mineralisation up to 1.59 g/t Au.
- Peak soil results of 2,660ppm antimony, confirming strong surface expression.
- Two coherent antimony anomalies extending ~400m and ~500m along strike.
- A broader mineralised trend extending over 2km, highlighting district-scale potential.
These results represent the first modern validation of the Gillham system and significantly upgrade the project’s prospectivity.
Geology & Mineralisation
Mineralisation at Gillham is structurally controlled and associated with quartz vein systems hosted within shale and siltstone units.
Key geological features include:
- Multiple parallel vein systems indicated by coincident soil and rock anomalies
- East–west trending mineralised structures across the project
- Northeast-trending faults acting as fluid pathways
- Mineralisation concentrated along bedding planes and structural contacts
Key Prospect Areas
Stewart Prospect
The Stewart Mine is a historically productive antimony occurrence, with records indicating approximately 1,000 tonnes of stibnite production.
Recent sampling has confirmed and upgraded the prospect:
- Up to 3.92% Sb with silver and lead
- Additional high-grade results exceeding 1.1% Sb
- Strong supporting soil anomalies
Stewart represents a priority drill target.
Davis Mine
The Davis Mine is the largest historical operation within the project area and hosts significant polymetallic mineralisation.
Recent results include:
- 1.96% Cu, 1.46% Zn, 0.29% Pb
- 4.79% Pb, 20.5 g/t Ag
The prospect is associated with favourable structural zones and remains open for expansion.
Andrews Gold Prospect (New)
A newly identified gold target located ~2km west of Davis:
- Up to 1.59 g/t Au
- Additional anomalous gold results
- Associated with historical shallow workings and quartz mineralisation
This discovery highlights previously unrecognised gold potential within the system.
South-East Davis
- Multiple anomalous gold results extending mineralisation from Davis
- Coincident arsenic soil anomaly supporting further exploration
Antimony Bluff
- Historical workings confirm established antimony mineralisation
- Rock samples up to 0.85% Sb
- Favourable geological setting consistent with broader project trends
Scale of the System
Exploration has defined a large and continuous mineralised footprint:
- Two high-grade antimony anomalies over ~400m and ~500m strike lengths
- A broader >2km mineralised corridor linking multiple prospects
- Strong multi-element anomalism (Sb, As, Zn, Pb) across the project
The scale and continuity of these anomalies support the potential for a significant underlying mineralised system.
Multi-Commodity Opportunity
While Gillham is primarily an antimony project, exploration has confirmed a broader polymetallic system:
- Antimony (primary focus and critical mineral)
- Silver (strong grades associated with antimony)
- Gold (newly identified upside)
- Copper, zinc and lead (base metal credits)
This multi-commodity profile enhances the project’s potential economic value.
Program Moving Forward
Pantera is advancing Gillham toward its maiden drilling program, which represents a key value catalyst.
Planned activities include:
- Infill soil sampling to refine anomalies
- Targeted rock sampling across new areas
- Detailed geological mapping
- Finalisation of drill targets and program design
- The Company is focused on rapidly progressing Gillham to drilling following the successful first phase of exploration.
- Maintain capital discipline by advancing the program within existing cash and the scheduled EnergyX payments, preserving balance sheet strength while driving exploration momentum.
- Continue to evaluate additional US-based mineral project opportunities.
Previously undocumented mines within the Gilham Project area
Gillham Project History
The Gillham district was a notable U.S source of antimony and silver during the late 1800s and early 1900s, with more than 18 recorded mine sites operating intermittently under favourable market conditions. Historical mining focused primarily on surface or near-surface operations, with no drilling, geophysics, or systematic targeting ever undertaken.
Stibnite (Sb2S3), the primary ore mined, occurs in quartz-filled fracture zones and vein systems. Individual stibnite-quartz lodes were historically reported to reach up to 1.3m in width, including solid stibnite blocks weighing more than 300kg from the Stewart Mine reportedly weighed 327kg.
The legacy of high-grade but shallow mining, combined with the absence of modern exploration, creates a rare first-mover opportunity to evaluate the district at depth and along strike.
