Pantera Minerals (ASX: PFE) Hits Ultra High Grade 19.2% Antimony as US Critical Minerals Race Accelerates

Key Highlights

• Pantera Minerals (ASX: PFE) reports rock chip assays grading up to 19.2% antimony at its Gillham Project in Arkansas.

• Multiple high-grade antimony discoveries confirm mineralisation across a 2km structural trend.

• Historic district hosts more than 18 antimony workings but has never been tested using modern drilling.

• Company advances toward maiden drilling as global demand for non-Chinese antimony continues to strengthen.

As governments race to secure critical mineral supply chains, antimony has quietly become one of the world’s most strategically important metals.

That backdrop has put Pantera Minerals (ASX: PFE) back in focus after the company reported rock chip assays grading up to 19.2% antimony from its wholly owned Gillham Project in Arkansas, USA.

The results come as Western governments continue searching for alternative supplies of critical minerals following tighter Chinese export controls. Antimony is widely used in defence systems, semiconductors, batteries, flame retardants and renewable energy infrastructure, making secure supply increasingly important for the United States and its allies. Source: US Geological Survey (USGS), International Energy Agency (IEA).

Pantera’s latest Phase 2 exploration campaign focused on validating historic mining areas before commencing the project’s first modern drilling program.

The strongest result came from the Stewart North prospect, where sample GR058 returned 19.2% antimony, together with 12.25g/t silver and 1.1% lead.

Additional standout assays included 15.0% antimony from Antimony Bluff, 9.3% antimony from the May Prospect and 7.55% antimony with 63.8g/t silver, 8.6% zinc and 7.44% lead from the Stewart Prospect.

While rock chip sampling only measures surface mineralisation and does not represent a mineral resource, the consistency of high-grade results across multiple prospects has strengthened confidence in the broader geological system.

The Gillham Project spans roughly 5,000 acres across Gillham East and Gillham West and contains more than 18 historic antimony and silver workings. Historical records show the Stewart Mine alone produced about 1,000 tonnes of stibnite, the principal ore mineral for antimony production.

Perhaps more significant is what has not yet happened.

Despite mining activity dating back to 1877, the district has never been tested using modern drilling techniques. Pantera says mineralisation identified at the Stewart and May prospects extends across strike lengths of 400 metres and 500 metres, forming part of a broader 2 kilometre mineralised corridor.

Executive Chairman and CEO Barnaby Egerton-Warburton said the latest work has sharpened the company’s exploration focus.

“The strong correlation between high-grade rock-chip results, extensive soil anomalies and historical workings continues to support the potential for significant mineralisation at depth.”

“Importantly, the Phase 2 program has refined multiple high-priority drill targets as we advance toward our maiden drilling campaign, which we believe represents a significant value catalyst for the Company.”

The announcement follows several months of portfolio repositioning by Pantera Minerals. Earlier this year, the company monetised its Smackover Lithium exposure through a transaction with EnergyX, leaving Pantera with an equity interest valued at approximately A$42.6 million. That has allowed management to prioritise the Gillham antimony project while reducing the need for near-term equity funding.

The broader market backdrop may also be working in the company’s favour.

China has historically dominated global antimony processing, but export restrictions introduced over the past year have tightened international supply. Chinese antimony oxide exports reportedly fell from 379 tonnes in April to 193 tonnes in May 2026, highlighting the growing shortage of Western supply. Source: Chinese customs trade data and industry reports.

Shares in Pantera Minerals (ASX: PFE) were trading at 1.7 cents, up 6.25% in Monday trading. The company has a market capitalisation of approximately A$8.4 million, with the stock delivering a 54.55% return over the past year.

Source: MarketIndex 

For now, investors will be watching the maiden drilling program closely. While the Gillham Project remains an early-stage exploration asset with no defined mineral resource, the latest results suggest Pantera may be uncovering a historically overlooked antimony district just as demand for secure Western supply continues to accelerate.

Sources: Pantera Minerals ASX Announcement (29 June 2026); U.S. Geological Survey (USGS); International Energy Agency (IEA); historical Arkansas mining records.