REG - Guardian Metal Res. - Discovery of Tremor Zone at Pilot Mountain

Guardian Metal ResourcesAnnouncement

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RNS Number : 9179G  Guardian Metal Resources PLC  04 June 2026

04 June 2026

Guardian Metal Resources plc

('Guardian Metal' or the 'Company')

Discovery of Tremor Zone at Pilot Mountain Tungsten Project

Guardian Metal Resources plc (NYSE.A: GMTL, LON:GMET, OTCQB:GMTLF), a
strategic exploration company focused on tungsten in Nevada, USA, is pleased
to announce the discovery of the "Tremor Zone", a newly identified mineralised
zone, within the Company's 100%-owned Pilot Mountain Tungsten Project ("Pilot
Mountain" or the "Project"), located in Nevada, USA. Following analysis of
geological and geophysical datasets, the Company's in-house technical team
identified the Tremor Zone area as one of the Project's priority exploration
targets. The area was also being evaluated as a potential location for key
mine infrastructure as part of the ongoing Pre-Feasibility Study ("PFS").
Condemnation drilling was therefore required across this blind target area,
and the initial drill hole, utilising a reverse circulation ("RC") drill rig,
intersected multiple intervals of tungsten-rich skarn mineralisation. The PFS,
which is nearing completion, is being supported by a U.S. Department of War
$6.2m Defense Production Act Title III investment¹ in Guardian Metal's
wholly-owned subsidiary, Golden Metal Resources (USA) LLC.

As a critical defense metal, tungsten has been designated as a strategic
priority by the U.S. government. Guardian Metal is focused on advancing its
co-flagship projects, Tempiute and Pilot Mountain, to become key pillars of
U.S. tungsten supply and help drive the reshoring of domestic mined
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.

 

Highlights:

•  The Tremor Zone is a newly discovered tungsten-skarn zone, identified by
the Company's in-house technical team during condemnation drilling conducted
at one of the Project's priority exploration targets in connection with the
ongoing PFS.

 

•   The initial Tremor Zone discovery drillhole, PMR26-077, intersected
five distinct zones of tungsten-rich skarn mineralisation which include a
highlight intercept of 13.68m of 0.31% WO(3) from only 102.11m - 115.82m
downhole (see Table 1) as well as 3.04m of 0.24% WO(3) (from 83.83m), 4.56m of
0.16% WO(3) (from 118.87m), 1.52m of 0.24% WO(3) (from 143.26m), and 4.56m of
0.24% WO(3) (from 152.4m). The Tremor Zone is classified as a blind discovery
as it is obscured by alluvial cover and therefore does not directly outcrop at
surface.

 

•    Following the completion of RC drillhole PMR26-077, an additional
drill rig was mobilised to the area to follow up and to test for any potential
extensions. Subsequent drill holes PMR26-078, PMR26-079, PM26-088, PM26-096,
and PM26-097 also intersected visually identified tungsten-bearing skarn over
approximate widths of 12m, 28m, 66m, 14m and 38m respectively.*

 

•    To date, the Tremor Zone has been delineated over approximately 400
metres of strike length, with drilling ongoing utilising two diamond drill
core rigs targeting both infill and step-out drilling as the Tremor Zone
remains open in multiple directions.

 

•     While the Tremor Zone is at an early stage of drilling and will not
be incorporated into the upcoming PFS, the Company has retained flexibility
within its infrastructure planning to allow for its potential inclusion in
future studies, subject to further drilling and technical evaluation.

 

•     The Tremor Zone is located within a part of the Pilot Mountain
Project that is entirely royalty free.

 

•    The Tremor Zone results further support the Company's view that Pilot
Mountain may contain further exploration potential, with multiple at-surface
skarn zones, including Garnet, Good Hope and Gunmetal, yet to be fully tested,
in addition to unnamed blind skarn targets generated by the Company's in-house
exploration team.

 

*No resource estimate has been prepared for the Tremor Zone and further
drilling and evaluation will be required to determine its significance to the
broader Pilot Mountain Project.

 

Oliver Friesen, CEO of Guardian Metal, commented:

"The blind discovery of the Tremor Zone is a very exciting result for
Guardian, coming at a time when we are advancing Pilot Mountain at pace across
multiple engineering and exploration workstreams simultaneously. The fact that
the Tremor Zone was identified during routine condemnation drilling across
just one of the Project's multiple priority exploration target areas,
highlights the untapped exploration potential that we believe exists at Pilot
Mountain.

"We have always maintained that this Project remains largely underexplored,
and the Tremor Zone is a compelling demonstration of that view. We look
forward to announcing additional assay results as we continue to drill and
define this new zone, while also advancing testing across the Project's other
priority exploration targets, all in parallel with our ongoing PFS
workstreams."

 

Further Details

 

 Drillhole ID  From (m)  To (m)  Length (m)  WO3(%)  Zn(%)  Ag(ppm)
 PMR26-077     83.82     86.87   3.04        0.24
 and           102.11    115.82  13.68       0.31
 and           118.87    123.44  4.56        0.16    0.22   139.27
 and           143.26    144.78  1.52        0.24    0.40
 and           152.4     156.97  4.56        0.24    0.40   20.37

 

Table 1: RC Drill Hole PMR26-077 Downhole Results

 

References

1              Company announcement, U.S. Department of Defense
Awards $6.2M to Golden Metal Resources for the Pilot Mountain Project, dated
23 July 2025

(
https://polaris.brighterir.com/public/guardian_metal_resources/news/rns/story/wvm0n3w
(https://polaris.brighterir.com/public/guardian_metal_resources/news/rns/story/wvm0n3w)
)

 

COMPETENT PERSON STATEMENT

The technical information contained in this disclosure has been read and
approved by Mr Nick O'Reilly (MSc, DIC, MIMMM QMR, MAusIMM, FGS), who is a
qualified geologist and acts as the Competent Person under the AIM Rules -
Note for Mining and Oil & Gas Companies. Mr O'Reilly is a Principal
consultant working for Mining Analyst Consulting Ltd which has been retained
by Guardian Metal Resources plc to provide technical support.

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 in the UK                       guardianmetal@tavistock.co.uk

 Emily Moss/Josephine Clerkin
 Edelman Smithfield

                                              guardianmetal@edelmansmithfield.com

 Financial PR in the US

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 US$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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