Green Bridge Metals Corporation Announces Filing of a NI 43-101 Technical Report and Mineral Resource Estimate for the Flagship Serpentine Project

Highlights of this Report include:

• Pit-constrained Mineral Resource Estimate using a US$10.25/tonne NSR cut-off.
• Indicated Mineral Resources: 21.6 million tonnes at average grades of 0.46% Cu, 0.16% Ni, and 0.014% Co (0.69% CuEq).
• Inferred Mineral Resources: 279.9 million tonnes at average grades of 0.37% Cu, 0.12% Ni, and 0.007% Co (0.53% CuEq).
• A core Massive Sulphide domain containing 1.8 million Indicated tonnes grading 1.16% Cu and 0.52% Ni (2.0% CuEq).
• Well-established regional infrastructure, including highways, rail access via Cleveland-Cliffs’ Northshore line to Lake Superior ports, grid power, skilled mining workforce, and equipment suppliers.
• Validation of historical drill results and assay data, combined with independent site inspections in 2020 and 2025, confirmed the presence of Cu-Ni-Co sulphide mineralization.
• The Serpentine deposit geometry is considered highly favourable for open-pit development with potential for low strip ratios.

Notes related to the Mineral Resource Estimate:

1. Mineral Resources, which are not Mineral Reserves, do not have demonstrated economic viability. The estimate of Mineral Resources may be materially affected by environmental, permitting, legal, title, taxation, sociopolitical, marketing, or other relevant issues.
2. An Inferred Mineral Resource has a lower level of confidence than that applying to an Indicated Mineral Resource and must not be converted to a Mineral Reserve. It is reasonably expected that the majority of Inferred Mineral Resources could be upgraded to Indicated Mineral Resources with continued exploration.

David Suda, President and CEO, commented:

“This Technical Report and Mineral Resource Estimate outlines and underscores the strategic importance of the Serpentine Copper-Nickel Project. Serpentine stands out as one of the more significant undeveloped copper-nickel projects in the U.S. Its scale, location, and alignment with national priorities—including recent FAST-41 initiatives to streamline permitting for critical mineral projects—position it as a cornerstone asset for Green Bridge. We see clear momentum building for mining in the United States, and this project puts us at the center of that opportunity.”

The Company is planning a follow-up exploration program in late 2025/ early 2026 to build on the new resource estimate. This will include infill drilling to upgrade Inferred Mineral Resources to Indicated Mineral Resources, step-out drilling to test extensions of the high-grade massive sulphide domain, and additional metallurgical testwork. Baseline environmental and geotechnical studies are also planned to support advancement of the Property toward a Preliminary Economic Assessment and ultimately a Pre-Feasibility Study.

Market Context

The Property aligns with growing demand for secure North American sources of copper, nickel, and cobalt—all designated as strategic by the U.S. government. These metals are critical for the clean energy transition, including electric vehicles, grid storage, and renewable power infrastructure. With scale and location in Minnesota’s established mining district, the Property is positioned to play a key role in the domestic supply chain.

Infrastructure Advantage

The Property benefits from excellent regional infrastructure. Northeastern Minnesota provides paved highways, rail connections, grid power, international shipping ports, and a skilled workforce. A private rail line serving Cleveland-Cliffs’ Northshore Mining Operations connects to Lake Superior ports, offering global shipping via the Great Lakes and St. Lawrence Seaway. The established taconite mining industry nearby ensures access to suppliers, contractors, and experienced personnel. These factors lower development risk and support year-round operations.

For a discussion of the Company’s data verification and QA/QC procedures, please see the Report, a copy of which is available under the Company’s profile on SEDAR+.

Qualified Persons

The Mineral Resource Estimate and Technical Report were prepared by Michael B. Dufresne, M.Sc., P. Geol., P.Geo., and Kristopher J. Raffle, B.Sc., P.Geo. of APEX Geoscience Ltd., and Eugene Puritch, P. Eng., FEC, CET, and Fred H. Brown, P.Geo. of P&E Mining Consultants Inc., all independent Qualified Persons under NI 43-101.

About Green Bridge Metals

Green Bridge Metals Corporation is a Canadian-based exploration company focused on acquiring critical mineral assets and developing projects along the basal contact of the Duluth Intrusion, north of Duluth, Minnesota. The Company’s portfolio includes properties prospective for bulk-tonnage copper-nickel sulphides, high-grade Ni-Cu-PGE magmatic sulphides, and titanium-vanadium in ilmenite.

Forward Looking Information

Certain statements and information herein, including all statements that are not historical facts, contain forward-looking statements and forward-looking information within the meaning of applicable securities laws. Such forward-looking statements or information include but are not limited to statements or information with respect to: the exploration and development of the Property; and plans and progress for the Property.

Although management of the Company believe that the assumptions made and the expectations represented by such statements or information are reasonable, there can be no assurance that forward-looking statements or information herein will prove to be accurate. Forward-looking statements and information by their nature are based on assumptions and involve known and unknown risks, uncertainties and other factors which may cause actual results, performance or achievements, or industry results, to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements or information. These risk factors include, but are not limited to: the exploration and development of the Property may not result in any commercially successful outcome for the Company; risks associated with the business of the Company; business and economic conditions in the mining industry generally; changes in general economic conditions or conditions in the financial markets; changes in laws (including regulations respecting mining concessions); and other risk factors as detailed from time to time.

The Company does not undertake to update any forward-looking information, except in accordance with applicable securities laws.

The Canadian Securities Exchange has neither approved nor disapproved the information contained herein and does not accept responsibility for the adequacy or accuracy of this news release.