New Tremor Zone discovery expands Guardian Metal (NYSE: GMTL) Pilot Mountain tungsten project

Rhea-AI Filing Summary

Guardian Metal Resources plc reported the discovery of the newly identified “Tremor Zone” tungsten-skarn zone at its 100%-owned Pilot Mountain Project in Nevada. The zone was found during condemnation drilling for the ongoing Pre-Feasibility Study.

Initial drillhole PMR26-077 intersected five tungsten-rich intervals, including 13.68 metres grading 0.31% WO3 from 102.11 to 115.82 metres downhole, plus several shorter mineralised intercepts. Follow-up drilling in adjacent holes visually identified tungsten-bearing skarn over widths of up to 66 metres, and the Tremor Zone has been traced over roughly 400 metres of strike, remaining open in multiple directions.

The Tremor Zone will not be included in the upcoming PFS, but infrastructure planning has been kept flexible for possible future incorporation after more drilling and technical work. The PFS is supported by a $6.2m Defense Production Act Title III investment into Guardian Metal’s U.S. subsidiary, underscoring the strategic importance of tungsten to U.S. defense supply chains.

Insights

Mining & metals analyst

New tungsten zone adds exploration upside at Pilot Mountain but is still early-stage.

The discovery of the Tremor Zone at Pilot Mountain introduces an additional tungsten-skarn zone beyond existing known deposits. Intercepts such as 13.68 metres at 0.31% WO3 suggest potentially meaningful mineralisation, and the zone has already been traced over about 400 metres of strike.

The company notes no resource estimate yet, and the Tremor Zone will not be part of the imminent Pre-Feasibility Study. Any impact on project economics depends on future drilling, metallurgical work, and eventual resource definition. The project benefits from prior $6.2m Defense Production Act Title III support, highlighting U.S. strategic interest in tungsten.

Ongoing infill and step-out drilling with two diamond rigs aims to extend and better define the Tremor Zone. Subsequent disclosures on assays, strike length and possible inclusion in later studies will clarify how this discovery could affect Pilot Mountain’s long-term tungsten production potential.

Key Figures

DPA Title III investment: $6.2m Main Tremor Zone intercept: 13.68m at 0.31% WO3 Additional intercept 1: 3.04m at 0.24% WO3 +5 more

8 metrics

DPA Title III investment $6.2m Defense Production Act Title III support for Pilot Mountain PFS

Main Tremor Zone intercept 13.68m at 0.31% WO3 Drillhole PMR26-077 from 102.11–115.82m downhole

Additional intercept 1 3.04m at 0.24% WO3 Drillhole PMR26-077 from 83.82m downhole

Additional intercept 2 4.56m at 0.16% WO3 Drillhole PMR26-077 from 118.87–123.44m

Additional intercept 3 1.52m at 0.24% WO3 Drillhole PMR26-077 from 143.26–144.78m

Additional intercept 4 4.56m at 0.24% WO3 Drillhole PMR26-077 from 152.4–156.97m

Tremor Zone strike length 400 metres Approximate strike length delineated to date

Visual skarn widths in follow-up holes 12m to 66m Approximate widths of visually identified tungsten-bearing skarn

Key Terms

tungsten-skarn, reverse circulation (RC) drill rig, Pre-Feasibility Study (PFS), Defense Production Act Title III, +2 more

6 terms

tungsten-skarn technical

"The Tremor Zone is a newly discovered tungsten-skarn zone, identified by the Company's in-house technical team"

reverse circulation (RC) drill rig technical

"the initial drill hole, utilising a reverse circulation ("RC") drill rig, intersected multiple intervals"

A reverse circulation (RC) drill rig is a type of exploration drill that uses a dual-tube system and air pressure to bring rock fragments up through the center of the drill pipe, producing cleaner, uncontaminated samples faster than conventional drilling. For investors, RC drilling matters because it delivers more reliable early-stage data about whether a mineral deposit is present and how extensive it might be, which speeds decision-making, reduces exploration costs and lowers the chance of costly surprises later on.

Pre-Feasibility Study (PFS) financial

"as part of the ongoing Pre-Feasibility Study ("PFS"). The PFS, which is nearing completion"

A pre-feasibility study (PFS) is an early but structured assessment of a proposed project that estimates its likely costs, revenues, timeline and main technical risks to see if the idea can work economically. It is more detailed than a concept note but less detailed than a full feasibility study, so investors use it as a reality check and to decide whether to commit more time or money. Think of it as a rough blueprint and budget estimate that helps weigh potential returns and key uncertainties before deeper investment.

Defense Production Act Title III regulatory

"supported by a U.S. Department of War $6.2m Defense Production Act Title III investment"

A portion of U.S. law that lets the government financially support and speed up domestic production of critical materials, equipment, and supply chains by providing loans, purchases, contracts or incentives to private companies. Think of the government stepping in as a big customer or lender to help a factory scale up quickly; for investors, this can create sudden revenue opportunities, reduce supply risks for key industries, and change a company’s growth and valuation prospects.

Competent Person regulatory

"acts as the Competent Person under the AIM Rules - Note for Mining and Oil & Gas Companies"

A competent person is a qualified, experienced professional who reviews, verifies and signs off on technical or regulatory information—such as reserve estimates, safety reports or clinical findings—so the public can trust the disclosure. Like a licensed inspector or trusted referee, this person brings documented skills and legal accountability to the statement, which matters to investors because their endorsement reduces uncertainty, helps assess risk, and supports fair valuation of a company’s claims.

inside information regulatory

"This announcement contains inside information for the purposes of Article 7 of EU Regulation 596/2014"

Information not available to the public that, if known, would likely cause a company’s stock or bonds to rise or fall—for example, undisclosed earnings, deals, product results, or management plans. It matters because trading on that information gives an unfair advantage, can distort market prices, and is typically illegal or subject to strict rules, so investors watch for proper disclosure and compliance to protect fair, transparent markets.

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Form 6-K: How Foreign Companies Report to the SEC →

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 OF THE SECURITIES EXCHANGE ACT OF 1934

04 June, 2026

Commission File Number 001-43199

Guardian Metal Resources PLC

c/o Orana Corporate LLP

25 Eccleston Place

London SW1W 9NF

United Kingdom

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ___

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ____

Guardian Metal Resources PLC

On 04 June, 2026, Guardian Metal Resources PLC issued a press release titled “Discovery of Tremor Zone at Pilot Mountain.”

A copy of the press release is attached hereto as Exhibit 99.1.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on behalf by the undersigned, thereunto duly authorized.

Guardian Metal Resources PLC

(Registrant)

Date: 04 June, 2026		By: /s/ Oliver Friesen
		Name: Oliver Friesen
		Title: Chief Executive Officer

Exhibit Index

Exhibit	Description of Exhibit
99.1	Discovery of Tremor Zone at Pilot Mountain dated 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% WO3 from only 102.11m - 115.82m downhole (see Table 1) as well as 3.04m of 0.24% WO3 (from 83.83m), 4.56m of 0.16% WO3 (from 118.87m), 1.52m of 0.24% WO3 (from 143.26m), and 4.56m of 0.24% WO3 (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 )

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 or contact the following:

Guardian Metal Resources plc Oliver Friesen (CEO)	Tel: +44 (0) 20 7583 8304
Cairn Financial Advisers LLP Nominated Adviser Sandy Jamieson/Jo Turner/Louise O'Driscoll	Tel: +44 (0) 20 7213 0880
Berenberg Joint Broker and Financial Adviser Jennifer Lee/Ivan Briechle	Tel: +44 (0) 20 3207 7800
Tamesis Partners LLP Joint Broker Charlie Bendon/Richard Greenfield	Tel: +44 (0) 20 3882 2868
Tavistock Financial PR in the UK Emily Moss/Josephine Clerkin	Tel: +44 (0) 7920 3150 / +44 (0) 7788 554035 guardianmetal@tavistock.co.uk
Edelman Smithfield Financial PR in the US	guardianmetal@edelmansmithfield.com

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.

FAQ

What did Guardian Metal Resources (GMTL) announce about the Tremor Zone?

Guardian Metal Resources announced discovery of the Tremor Zone, a new tungsten-skarn zone at its 100%-owned Pilot Mountain Project in Nevada. The initial drillhole PMR26-077 intersected five mineralised intervals, including 13.68 metres grading 0.31% WO3 between 102.11 and 115.82 metres downhole.

How extensive is the Tremor Zone at Guardian Metal’s Pilot Mountain project?

To date, drilling has delineated the Tremor Zone over approximately 400 metres of strike length at Pilot Mountain. The zone remains open in multiple directions, and ongoing infill and step-out drilling with two diamond core rigs is targeting further extensions and definition of the mineralised area.

Will the Tremor Zone be included in Guardian Metal’s upcoming PFS for Pilot Mountain?

The Tremor Zone will not be incorporated into the upcoming Pre-Feasibility Study for Pilot Mountain. Guardian Metal has, however, intentionally preserved flexibility in its mine infrastructure planning so the zone could be evaluated for inclusion in future technical studies after more drilling and analysis.

What supporting funding has Guardian Metal (GMTL) received for the Pilot Mountain PFS?

The Pilot Mountain PFS is supported by a $6.2m Defense Production Act Title III investment from the U.S. Department of War into Golden Metal Resources (USA) LLC, Guardian Metal’s wholly owned subsidiary. This backing underscores tungsten’s designation as a strategic defense metal by U.S. authorities.

What drill results define the Tremor Zone discovery at Pilot Mountain?

Key results from RC drillhole PMR26-077 include 13.68 metres at 0.31% WO3 from 102.11–115.82 metres, plus 3.04 metres at 0.24% WO3 from 83.82 metres and several shorter intervals. Follow-up holes also intersected visually identified tungsten-bearing skarn over widths up to about 66 metres.

How does Guardian Metal (GMTL) position its tungsten projects strategically?

Guardian Metal positions Pilot Mountain and Tempiute as co-flagship tungsten projects aimed at reviving U.S. mined tungsten production. The company seeks to support reshoring of domestic supply chains, reduce reliance on foreign sources, and strengthen U.S. economic and defense security for this critical metal.