8 July 2026

Guardian Metal Resources plc

('Guardian Metal' or the 'Company')

Strategic Partnership Signed to Advance Domestic Tungsten Mining and Processing for U.S. Defense Applications

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 that it has entered into a strategic partnership (the "Partnership") with the Montana Mining Association ("MMA") to collaborate on a tungsten mining and recovery pilot program supporting domestic defense applications. The Partnership is also being advanced in conjunction with Montana Technological University ("MTU") and the Army Research Laboratory ("ARL").

As part of the Partnership, Guardian Metal will supply stockpiled legacy ore from its Tempiute Tungsten project ("Tempiute" or the "Project"), located near Rachel, Nevada, approximately 150 miles northeast of Las Vegas. 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. 

As a critical defense metal, tungsten has been formally designated a strategic priority by the U.S. government. Guardian Metal's mission is to advance its co-flagship projects, Tempiute and Pilot Mountain, as a cornerstone of U.S. tungsten supply, directly supporting national efforts to reshore production. This strategy is expected to reduce reliance on foreign supply chains, strengthen economic and defense security, and deliver long-term value for shareholders.

KEY HIGHLIGHTS

Matt Vincent, Executive Director of MMA, commented: 

"We are excited to work with Guardian Metal on this Partnership, which we feel is incredibly important to the industry and our nation's security. Guardian Metal's Tempiute material represents what we believe will prove to be an important domestic source of tungsten for this Partnership, as well as a demonstration of our Association's ability to effectively establish a broader network of critical minerals projects across the Mountain West."

Oliver Friesen, CEO of Guardian Metal Resources, commented: 

"We are delighted to enter into this Partnership with MMA, ARL, and MTU to advance this strategically important pilot program. The selection of Tempiute as a feedstock source is a strong endorsement of the strategic significance of Guardian Metal's entirely Nevada-based tungsten project portfolio.

"At a time when tungsten supply security has never been more critical to U.S. defense and industrial capability, this initiative represents a tangible step toward building an entirely domestic supply chain, free from reliance on foreign sources."

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:

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.