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Pantera advances Gillham Silver-Antimony Project toward maiden drilling following Phase 2 sampling

Jane Morgan Management

Key Facts:

• Pantera Minerals has completed a follow-up soil and rock sampling programme at its 100%-owned Gillham Silver-Antimony Project in southwest Arkansas, ahead of a planned maiden drilling programme in July/August.
• The Phase 2 programme comprised 75 soil samples and 30 rock chip samples across previously unsampled target areas, building on Phase 1 results that defined two high-priority drill targets across a 2km mineralised trend.
• Previous sampling returned rock chip results of up to 3.92% antimony and 10.3g/t silver, with laboratory assay results from the latest programme expected within approximately four weeks.
• The Gillham district was historically a significant US source of antimony and silver in the late 1800s and early 1900s, with over 18 recorded mine sites, yet has not previously been subject to modern exploration or drilling.
• Antimony is considered a critical mineral with global supply dominated by China, Russia, and Tajikistan; Pantera stated it remains funded for its current exploration programme through existing cash and scheduled EnergyX payments.

20 May 2026 | West Perth, Western Australia

Pantera Minerals Limited (ASX: PFE; OTCQB: PTMLF) has completed a follow-up soil and rock sampling program at its 100%-owned Gillham Silver-Antimony Project in southwest Arkansas, marking the final surface exploration phase ahead of planned maiden drilling in July/August.

The Phase 2 program included 75 soil samples and 30 rock samples across previously unsampled target areas, including the Andrew Gold anomaly, Antimony Bluff, and the May and Stewart mine areas.

The program builds on Phase 1 results, which defined two coherent high-priority drill targets across a broader 2km mineralised trend. Previous sampling returned rock chip results of up to 3.92% antimony and 10.3g/t silver, alongside soil anomalism of up to 2,660ppm antimony.

All samples have been submitted for laboratory assay, with results expected in approximately four weeks. These results will be used to refine drill targets ahead of Pantera’s maiden drill program.

Pantera said several additional undocumented historic mines had also been located and sampled during the latest field campaign.

The Gillham district was historically a notable U.S. source of antimony and silver during the late 1800s and early 1900s, with more than 18 recorded mine sites. Despite this history, the area has not previously been subject to modern exploration, drilling, geophysics or systematic targeting.

Antimony, silver, lead and copper are included on the U.S. Critical Minerals list, with global antimony supply currently dominated by China, Russia and Tajikistan.

Pantera said it remains funded for its current exploration program through existing cash and scheduled EnergyX payments.

Barnaby Egerton-Warburton, Executive Chairman and CEO, commented:

“The completion of this follow-up sampling program further strengthens our geological understanding across the Gillham Silver-Antimony Project. By extending coverage into the Andrew Gold anomaly, the Antimony Bluff Mine area, and around the May and Stewart mines, we have materially expanded our geochemical footprint across the district.

Geological observations across multiple historic workings continue to be highly encouraging as we complete the final surface exploration phase before drilling. Results from both programs will be central to refining priority targets and advancing Gillham as a strategically important U.S. based critical minerals project.”

Pantera’s upcoming work program includes drill rig contracting for the maiden drill program, continued sampling of potential extensions to known mineralisation, disciplined exploration spending within existing funding, and evaluation of additional U.S. critical minerals opportunities.

– ENDS –

This release is authorised by the Board of Directors of Pantera Minerals Limited.

About us:

ABOUT PANTERA MINERALS

Pantera Minerals Limited (ASX: PFE OTCQB: PTMLF) is a forward-looking critical minerals exploration and development company focused on advancing projects in critical minerals across the United States with a particular focus on Arkansas. The Company is committed to leveraging modern exploration methods – including geochemistry, geophysics, and advanced modelling – to unlock value in regions historically mined for critical minerals, which are recognised by the U.S. government as essential to supply chain security.

 

Contact details:

For further information, please contact:

Barnaby Egerton-Warburton
Executive Chairman and CEO
E: [email protected]
P: +61 (0) 437 291 155

Jane Morgan
Investor Relations
E: [email protected]
P: +61 (0) 405 555 618