Guardian Metal Resources PLC Announces Board Update

Guardian Metal Resources (NYSE-A:GMTL) has appointed Dr Mark Bramley Thorpe to its Board with immediate effect as an Independent Non-executive Director and member of the Audit Committee.

Rhea-AI Summary

Guardian Metal Resources (NYSE-A:GMTL) has appointed Dr Mark Bramley Thorpe to its Board with immediate effect as an Independent Non-executive Director and member of the Audit Committee. He replaces Mark Burnett, who retired. According to Guardian Metal, Dr Thorpe is 66 and has held directorships at Envirogold Global Limited and Canada Mining Innovation Council.

Positive

• Appointment of an independent non-executive director to the Board and Audit Committee
• Immediate replacement of retired director Mark Burnett, maintaining full Board composition

Negative

• None.

Argus Jun 11 session

+7.66% close to close Open Argus

Details

News Market Reaction – GMTL

On Jun 11, the day this news came out, GMTL closed 7.66% above the previous close.

Data tracked by StockTitan Argus for the Jun 11 session.

Key Figures

Director age: 66 years

Director age

66 years

Age of Dr Mark Bramley Thorpe at appointment

Historical Context

5 past events · Latest: Jun 04

5 events

1. Jun 04

   Exploration discovery

   24h Move

   -5.8%

   New Tremor Zone tungsten-skarn body discovery at Pilot Mountain in Nevada.

2. Jun 02

   Option exercise

   24h Move

   +2.6%

   Exercise of options over 500,000 new ordinary shares raising £70,000.

3. May 21

   Board appointment

   24h Move

   -2.8%

   Planned appointment of Dr. Mark Thorpe as Independent Non-Executive Director.

4. May 13

   Project update

   24h Move

   +9.8%

   Tempiute tailings mapping, 193 new claims and large footprint expansion.

5. May 06

   PFS progress

   24h Move

   +9.0%

   Pre-Feasibility Study progress at Pilot Mountain backed by $6.2m award.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Key Terms

independent non-executive director, audit committee

2 terms

independent non-executive director financial

"Mark will be an Independent Non-executive Director of Guardian Metal"

An independent non-executive director is a board member who is not part of a company’s day-to-day management and has no close ties to major owners, so they can offer unbiased oversight of strategy, risks, and executive pay. For investors, they act like an impartial referee who helps prevent conflicts of interest, improve transparency and hold management accountable, which can reduce governance risk and protect shareholder value.

audit committee financial

"and will be a member of the Audit Committee."

A company's audit committee is a small group of board members who act like independent inspectors for the firm's finances, overseeing how financial reports are prepared, monitoring internal controls, and managing the relationship with external auditors. Investors care because a strong audit committee reduces the risk of accounting errors, fraud, or misleading statements, making financial statements more trustworthy and helping protect shareholder value.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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LONDON, UK / ACCESS Newswire / June 11, 2026 / Further to its announcement of board changes on 21 May 2026 and the conclusion of necessary due diligence, Guardian Metal Resources plc (NYSE-A:GMTL)(LON:GMET)(OTCQB:GMTLF), a mineral exploration company focused on tungsten within Nevada, USA, announces the formal appointment of Dr Mark Bramley Thorpe to its Board with immediate effect.

Mark will be an Independent Non-executive Director of Guardian Metal and will be a member of the Audit Committee. He replaces Mr. Mark Burnett who retired from the Board, as announced previously.

Regulatory Disclosures:

The following information is disclosed pursuant to Rule 17 and Schedule Two paragraph (g) of the AIM Rules for Companies in relation to Mr. Thorpe, aged 66 :

Current directorships and/or partnerships:	Former directorships and/or partnerships (within the last five years):
-	Envirogold Global Limited (Canada) Canada Mining Innovation Council (Canada)

There is no further information to be disclosed pursuant to paragraph (g) of Schedule 2 of the AIM rules.

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.

This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact rns@lseg.com or visit www.rns.com.

SOURCE: Guardian Metal Resources PLC

View the original press release on ACCESS Newswire

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What board change did Guardian Metal Resources (NYSE-A:GMTL) announce on June 11, 2026?

Guardian Metal Resources announced the appointment of Dr Mark Bramley Thorpe to its Board as an independent non-executive director. According to Guardian Metal, his appointment is effective immediately and he will also serve on the Audit Committee, replacing retired director Mark Burnett.

Who is Dr Mark Bramley Thorpe on the Guardian Metal Resources (GMTL) board?

Dr Mark Bramley Thorpe is an independent non-executive director on the Guardian Metal board and a member of the Audit Committee. According to Guardian Metal, he is 66 years old and has held directorships at Envirogold Global Limited and Canada Mining Innovation Council.

Which director did Dr Mark Bramley Thorpe replace at Guardian Metal Resources (NYSE-A:GMTL)?

Dr Mark Bramley Thorpe replaced Mark Burnett on the Guardian Metal Resources board. According to Guardian Metal, Mark Burnett retired from the Board, and Dr Thorpe has been appointed as an independent non-executive director and Audit Committee member with immediate effect.

What is Dr Mark Bramley Thorpe’s role on the Guardian Metal Resources (GMTL) Audit Committee?

Dr Mark Bramley Thorpe serves as a member of Guardian Metal Resources’ Audit Committee. According to Guardian Metal, he joins the committee in his capacity as an independent non-executive director following his immediate appointment to the Board on June 11, 2026.

What AIM Rule 17 disclosures did Guardian Metal Resources (GMTL) make about Dr Mark Bramley Thorpe?

Guardian Metal disclosed Dr Thorpe’s age, 66, and his current and recent directorships under AIM Rule 17 and Schedule Two paragraph (g). According to Guardian Metal, there is no further information to be disclosed under paragraph (g) of Schedule 2 regarding his appointment.

Does the Guardian Metal Resources (GMTL) board update affect the company’s Audit Committee?

Yes, the board update adds Dr Mark Bramley Thorpe to the Audit Committee. According to Guardian Metal, he joins as an independent non-executive director and Audit Committee member, replacing retired board member Mark Burnett following completion of due diligence.