REG - Guardian Metal Res. - Tempiute Historical Mine Tailings Update

Guardian Metal ResourcesAnnouncement

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RNS Number : 0608E  Guardian Metal Resources PLC  13 May 2026

13 May 2026

Guardian Metal Resources PLC

('Guardian Metal' or the 'Company')

Tempiute Tungsten Project Historical Mine Tailings Update

 

Guardian Metal Resources PLC (NYSE.A:GMTL, LON:GMET, OTCQB:GMTLF), a strategic
mineral exploration company focused on tungsten in Nevada, USA, is pleased to
announce an update relating to historical mine tailings present at the
Company's Tempiute Tungsten Project ("Tempiute" or the "Project") located in
south-central Nevada less than 250 miles (402 km) southeast of the Company's
Pilot Mountain Tungsten Project. Tempiute, formerly known as the Emerson
Tungsten Mine, is a significant past producing tungsten mine, which was
originally discovered in 1916 and most recently operated during the 1980s. The
Company is evaluating near-term resource and tungsten production opportunities
across the extensive former producing mine, with the identification of
tailings from decades of historical production adding a compelling new
dimension to the Project.

As a critical defense metal, tungsten has been designated as a strategic
priority by the U.S. government. Guardian Metal's mission is to establish its
co-flagship tungsten projects as the cornerstone of U.S. mined tungsten
supply, directly supporting national efforts to re-establish domestic
production. This is intended to help the U.S. reduce reliance on foreign
supply chains, strengthen economic and defense security, and deliver long-term
value for shareholders.

Oliver Friesen, CEO of Guardian Metal, commented:

"Tempiute has a long and well-documented tungsten production history, and we
believe the historical tailings represent a unique opportunity warranting
further investigation, one that could provide near-term support to the U.S.
tungsten supply chain alongside a meaningful reclamation outcome. Our initial
assessment has confirmed the presence of tungsten across a substantial surface
footprint. As a result we are advancing towards an auger drilling program
which will help us better understand the characteristics of the material
subsurface.

"With tungsten recognised as a critical defense metal and domestic supply a
priority for the U.S. government, this work is very timely. Furthermore we are
encouraged by the results of our investigations to date."

 

HIGHLIGHTS

 •    Guardian Metal is evaluating the potential of recovering tungsten and other
      metals from the historic tailings at Tempiute, with a view to provide an
      opportunity for near-term, domestically sourced tungsten in the U.S.

 •    Through detailed mapping and sampling, the surface area footprint of
      historical tungsten-enriched mine tailings at Tempiute (the "Tempiute
      Tailings") has been determined to cover approximately 550 acres (2.23 km²).

 •    As a result, Guardian Metal has expanded its mineral rights position
      significantly, staking 193 claims and increasing its overall Tempiute
      footprint by over 375% to secure what the Company strongly believes to be the
      full extent of the Tempiute Tailings. This expansion runs parallel to the
      Company's appropriate environmental inquiry.

 •    An auger drilling program is planned to commence in June 2026, subject to
      receipt of required permits, and will enable characterization of the tailings
      material and surrounding soils for environmental evaluation and assessment of
      the tungsten resource potential.

 •    The combination of modern recovery methods and elevated tungsten prices makes
      this an increasingly compelling near-term domestic tungsten supply
      opportunity, while also offering a meaningful reclamation outcome.

 •    Previously milled material sitting at surface, combined with existing on-site
      infrastructure, means the cost and development timeline of a reprocessing
      operation could compare favourably to a conventional tungsten mining project,
      subject to confirmation of sufficient tailings tonnage and grade.

 

Background

To determine the economic and environmental remediation potential of
historical mine tailings at Tempiute, the Company undertook a detailed mapping
and sampling program across the entire historical mine tailings area.

Evaluation of publicly available production records, dating back to the 1930s,
was correlated with satellite imagery, spectral analysis, and ground mapping
to identify the tailings footprint extending down slope from the Tempiute
mine. Follow up ground investigation and surface sampling delineated a large
tungsten-enriched zone and confirmed the extent of the historical mine
tailings area to cover a surface footprint of approximately 550 acres (2.23
km²). Sampling also provided an initial characterisation of the material,
verifying the presence of tungsten and other metals.

As a result, Guardian Metal expanded its mineral rights position
significantly, staking 193 mining claims and increasing the overall Tempiute
Project footprint by over 375%, to secure what the Company believes to be the
full extent of the historical tailings.

Subject to receipt of the required permits, an auger drilling program is
planned to commence in June 2026 to characterise the tailings material and
surrounding soils for environmental evaluation and resource potential. This
work will advance the Company's environmental inquiry and enable determination
of the potential for a tungsten resource.

Next Steps

The Company has submitted a Notice to the Bureau of Land Management and the
Nevada Division of Environmental Protection for the proposed auger drilling
program. Subject to approval, the auger drilling program is targeted to
commence in June 2026 and is expected to take approximately three months to
complete. The program is designed to allow the Company to make all appropriate
inquiries regarding current environmental conditions on site, while estimating
the total volume and grade of tungsten and base/precious-metal bearing
material present.

In parallel, an independent metallurgical study will be completed to determine
the most effective method of recovering tungsten and other metals from the
tailings, with results expected in the coming months. This study will also
characterize the geochemistry of the tailings post tungsten recovery to inform
the final reclamation design of the site.

 

This announcement contains inside information for the purposes of Article 7 of
EU Regulation 596/2014 (which forms part of domestic UK law pursuant to the
European Union (Withdrawal) Act 2018). The Directors of the Company are
responsible for this announcement.

 

Forward Looking Statements

This announcement contains forward-looking statements relating to expected or
anticipated future events and anticipated results that are forward-looking in
nature, and, as a result, are subject to certain risks and uncertainties,
including general economic, market and business conditions, competition for
qualified staff, the regulatory process and actions, technical issues, new
legislation, potential delays or changes in plans, uncertainties resulting
from operating in a new political jurisdiction, uncertainties regarding the
results of exploration, the timing and granting of prospecting rights, the
timing and granting of regulatory and other third party consents and
approvals, Guardian Metal's or any third party's ability to execute and
implement future plans, and the occurrence of unexpected events.

Forward-looking statements are subject to risks and uncertainties, including
those described in the Company's filings with the U.S. Securities and Exchange
Commission. Guardian Metal undertakes no obligation to publicly update or
revise any forward-looking statements, whether as a result of new information,
future events or otherwise, except as may be required by law.

This announcement does not purport to be full or complete. No reliance may or
should be placed by any person for any purpose on the information contained in
this announcement or its accuracy, fairness or completeness. The information
in this announcement is subject to change.

 

For further information visit www.Guardianmetalresources.com
(http://www.goldenmetalresources.com) or contact the following:

 Guardian Metal Resources plc                 Tel: +44 (0) 20 7583 8304

 Oliver Friesen (CEO)
 Cairn Financial Advisers LLP                 Tel: +44 (0) 20 7213 0880

 Nominated Adviser

 Sandy Jamieson/Jo Turner/Louise O'Driscoll
 Berenberg                                    Tel: +44 (0) 20 3207 7800

 Joint Broker and Financial Adviser

 Jennifer Lee/Ivan Briechle
 Tamesis Partners LLP                         Tel: +44 (0) 20 3882 2868

 Joint Broker

 Charlie Bendon/Richard Greenfield
 Tavistock                                    Tel: +44 (0) 7920 3150 /

                                              +44 (0) 7788 554035

 Financial PR                                 guardianmetal@tavistock.co.uk

 Emily Moss/Josephine Clerkin

About Guardian Metal Resources

Guardian Metal Resources PLC (NYSE.A: GMTL, LON:GMET, OTCQB:GMTLF) is a
strategic mineral exploration company driving the revival of U.S. mined
tungsten production and strengthening America's defense metal independence.
The Company is advancing two co-flagship tungsten projects, Pilot Mountain,
one of the largest undeveloped tungsten deposits in the U.S. and Tempiute,
formerly America's largest producing tungsten operation, both located in
Nevada, one of the top-rated mining jurisdictions in the United States.

In July 2025, the U.S. Department of War (DoW) under Title III of
the Defense Production Act of 1950, as amended, invested U.S. $6.2M in
Golden Metal Resources (USA) LLC, a wholly-owned subsidiary of Guardian
Metal Resources PLC, to support the Pilot Mountain PFS. The Company completed
a U.S. listing on the NYSE American on March 20, 2026.

Tungsten is a strategic metal critical to the defense, energy transition,
technology, and industrial sectors. In the context of shifting geopolitical
dynamics and tightening Chinese export restrictions, Guardian Metal is well
positioned to play a leading role in re-establishing a secure, domestically
mined U.S. supply chain for this vital defense metal.

 

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