Mr. David Greenway reports

COPPER ONE REPORTS HIGH-GRADE COPPER UP TO 10.5% CU AND 188 G/T SILVER FROM MAJUBA HILL UNDERGROUND SAMPLING

Copper One Resources Corp. has released high copper results from samples collected during the recent underground breccia mapping program within the historic Middle adit at its flagship Majuba Hill copper-silver-gold project, located in Pershing county, Nevada.

Sample MHR-793 returned high-grade values with:

• 10.5 per cent copper and 188 parts per million (5.5 ounces per ton) silver.

The 2026 breccia mapping samples were collected to characterize breccia textures at each of the 15 locations. Eight rock samples collected in 2016 with copper ranging from 0.39 to 1.6 per cent Cu and the adjacent sample MHR-794 sampled oxide copper described as azurite within magmatic-hydrothermal, intrusive breccias having coarse-spongy and radiating tourmaline matrix.

"Majuba Hill has entered an exciting new phase with drilling now under way on our initial ExploreTech AI-designed 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-assisted exploration tools, we continue refining drill targets and improving the precision of our exploration program. These results provide additional confidence in our current drill program as we evaluate the extent and continuity of the mineralized breccia system."

Middle adit breccia mapping

The spring 2026 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 planned drill site, designated 26PDH-1, is positioned to drill below the Middle adit high-grade rock samples. The hole is also positioned to test the southern extension of the hydrothermal-magmatic breccias (with tourmaline matrix) to the south. High-grade copper and silver-bearing hydrothermal-magmatic breccias (with tourmaline matrix) was 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 of 0.74 per cent Cu and 120.8 ppm Ag); and
• MHB-32: (379.5 feet/115.7 metres grading 0.33 per cent Cu and 16.97 ppm Ag; including 40 feet (12.2 m) at 1.36 per cent Cu and 13.33 ppm Ag); 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 is a fundamental consideration in advancing mineral projects. Majuba Hill benefits from established infrastructure including road access, power availability, water and access to skilled personnel, factors that may reduce exploration and future development requirements compared with more remote projects. 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 to date has identified a large copper-silver-gold mineralized system that remains open for additional evaluation. Further drilling and technical studies will be required to determine its extent, continuity and potential. 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 persons

Technical aspects of this news release with respect to Majuba Hill have been reviewed and approved by E.L. (Buster) Hunsaker III, CPG 8137, designated as a qualified person under National Instrument 43-101 (Standards of Disclosure for Mineral Projects).

Quality assurance/quality control measures, chain of custody

The company utilizes a QA/QC program using best industry practices at the Majuba Hill project. The samples are placed in cloth sample bags and are transported from the Giant Mining secure warehouse to the ALS Labs sample prep facility in Elko, Nev. ALS Labs then securely transports the prepared pulps to its analytical lab in North Vancouver, B.C.

All samples are analyzed for copper, gold, silver and 33 other elements. Gold is determined by ALS Labs method Au-AA23, which is a fire assay with an AAS finish on a 30-gram split. Copper, silver and the remaining 31 elements are determined by ALS Labs method ME-ICP61, which is a four-acid digestion and ICP-AES assay.

About Copper One Resources Corp.

Copper One 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 an up-to-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 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 metal projects across North America.

We seek Safe Harbor.