Mr. David Greenway reports

COPPER ONE EXPANDS GEOLOGICAL UNDERSTANDING AT NEVADA'S MAJUBA HILL COPPER-SILVER-GOLD PROJECT THROUGH UNDERGROUND BRECCIA MAPPING

Copper One Resources Corp. has provided an update on recent underground breccia mapping completed within the historic Middle adit at its flagship Majuba Hill copper-silver-gold project, located in Pershing county, Nevada.

Underground breccia mapping

Breccia mapping in the historic underground workings outlined the geometry of multiple brecciation events similar to those identified during the spring breccia mapping campaign (see news release dated July 3, 2026). Zones of copper oxide were mapped and sampled within the breccia zones.

The mapping results provide additional geological confidence for the continuing 2026 drill program by helping refine structural targets and identifying new areas with potential for high-grade copper mineralization.

"Majuba Hill has entered an exciting new phase, with drilling now under way on our initial ExploreTech AI-designed [artificial intelligence] core hole," said David Greenway, president and chief executive officer of Copper One. "Recent underground mapping within the historic middle adit has strengthened our geological model by confirming breccia-hosted copper mineralization and its relationship to surface structures. By combining detailed field geology with AI-driven exploration tools, we are refining drill targets and improving the precision of our exploration program as we work to expand known mineralization. With copper demand continuing to accelerate from electrification, AI infrastructure, data centres, grid modernization and advanced manufacturing, we believe Majuba Hill is well positioned to become an increasingly important North American copper project."

Middle adit breccia mapping

The 2026 spring surface geological mapping program focused on identifying and delineating outcropping tourmaline breccia bodies interpreted to be associated with high-grade copper mineralization. Underground geological mapping within the historic Middle adit confirmed the presence of the same breccia styles identified during surface mapping. The program confirmed the known northeast-trending breccia system and identified a previously underreported north-northwest-trending breccia corridor, providing additional geological confidence for the continuing 2026 drill program by refining structural targets and identifying new areas with potential for high-grade copper mineralization.

The azurite- and malachite-bearing tourmaline breccias identified underground align closely with the north-northwest-trending surface breccia system. Multiple brecciation events were identified, with tourmaline-cemented breccias postdating earlier magmatic-hydrothermal brecciation.

The company has planned five drill sites that will be utilized to drill up to nine holes. The planned drill holes are designed to test extensions of previously identified high-grade mineralization while evaluating newly recognized structural corridors defined through recent mapping.

The planned drill site, designated 26PDH-1, is positioned to extend the high-grade copper in breccia zones intersected in previous drill holes:

• MHB-2: 146 feet/44.5 metres grading 1.41 per cent copper and 97.6 parts per million silver, including 28 feet at 0.74 per cent copper and 120.8 parts per million silver;
• MHB-32: 379.5 feet/115.7 metres grading 0.33 per cent Cu and 16.97 parts per million silver, including 40 feet (12.2 metres) at 1.36 per cent copper and 13.33 parts per million silver.

See news releases dated July 17, 2020, and May 22, 2025.

About the Majuba Hill copper-silver-gold deposit, Nevada

Majuba Hill is Copper One's flagship copper, silver and gold exploration project, located in Nevada, United States, one of the world's premier mining jurisdictions. Nevada was ranked the No. 1 mining jurisdiction globally in the Fraser Institute's 2022 Annual Survey of Mining Companies, underscoring the strategic importance of Majuba Hill's location in a stable, mining-friendly region with a long history of responsible mineral development.

The Majuba Hill property covers approximately 9,684 acres and is located about 113 road kilometres, or 70 miles, southwest of Winnemucca, Nev., and 251 kilometres, or 156 miles, northeast of Reno. The project is accessible by well-maintained county roads from the Imlay, Nev., exit on U.S. Interstate 80, followed by an approximately 23-mile drive west.

Access to skilled personnel, roads, power and water are fundamental considerations in advancing mineral projects. Majuba Hill benefits from a strong infrastructure foundation in each of these areas, providing a significant competitive advantage over more remote projects, where infrastructure can represent a major cost and development hurdle.

Majuba Hill is a historical producer with a substantial exploration database, including approximately 89,395 feet of drilling completed to date, which provides Copper One with a significant technical foundation for continuing exploration.

Exploration work at Majuba Hill has identified indications of a potentially significant copper-silver-gold mineralized system. However, further drilling, geological modelling and technical evaluation will be required to determine the extent, continuity and significance of mineralization at the project. Majuba Hill is located in Nevada, a leading mining jurisdiction, and benefits from scale, access, infrastructure and a substantial historical exploration database.

Technical disclosure and qualified person

Technical aspects of this news release with respect to Majuba Hill have been reviewed and approved by E.L. (Buster) Hunsaker III, CPG (No. 8137), designated as a qualified person under National Instrument 43-101, Standards of Disclosure for Mineral Projects.

About Copper One Resources Corp.

Copper One Resources is focused on identifying, acquiring and advancing high-potential copper, copper-silver-gold and copper-molybdenum projects to help meet the growing global demand for critical metals required for electrification, AI infrastructure and data centres, renewable energy, defence, and the modernization of power systems.

The company's flagship asset is the Majuba Hill copper-silver-gold district, located approximately 156 miles (251 kilometres) from Reno, Nev. Majuba Hill is an exploration-stage porphyry copper project situated in a premier mining jurisdiction with excellent infrastructure, where continuing exploration is focused on evaluating the scale and continuity of a large copper-silver-gold mineralized system.

Copper One also owns a 100-per-cent interest in the Redonda copper-molybdenum project, located northeast of Campbell River in British Columbia's Vancouver mining division. The district-scale project comprises approximately 2,746.46 hectares (6,786 acres) across nine mineral claims and hosts a porphyry-style copper-molybdenum system within the highly prospective Coast suture zone, a geological belt known for significant porphyry copper and skarn mineralization. The company believes Redonda has the potential to become a significant long-term exploration asset as systematic exploration continues to evaluate the scale and continuity of the mineralized system.

In addition, Copper One holds an option to earn up to a 100-per-cent interest in the Redhill property , located south of Ashcroft, B.C., adjacent to the Trans-Canada Highway. The 4,736-hectare (11,704-acre) property hosts volcanogenic massive sulphide (VMS) mineralization prospective for copper, zinc, silver and gold while also demonstrating potential for epithermal gold mineralization.

Copper One is advancing its portfolio through systematic exploration, modern geological modelling and disciplined technical evaluation. The company remains committed to responsible exploration practices, technical transparency and creating long-term shareholder value through disciplined exploration and the advancement of critical metals projects across North America.

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