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Vancouver, BC – June 19 , 2026 - TheNewswire – Copper One Resources Corp. ("Copper One" or the "Company") (CSE:CEXY | OTCID:CEXYF | FSE:IW8 | WKN: A42AGR ) is pleased to announce that it has entered into an amendment agreement (the “Agreement” ) and commenced closing process to acquire 100% interest in the Majuba Hill Copper-Silver-Gold Project ( "Majuba Hill" or the "Project" ) located in Pershing County, Nevada, a well-established mining jurisdiction in the United States.

The transaction terms set out in the Agreement (the "Transaction Terms" ) provide for the acquisition of the Project for a cash purchase price of US$1,300,000. Compared to the consideration contemplated under the original option framework, the amended Transaction Terms represent a reduction of approximately US$2.7 million (approximately C$3.8 million) in the purchase price payable by the Company.

Majuba Hill is Copper One's American flagship copper asset. The Company believes full control of the Project is an important step toward advancing a Nevada-based copper opportunity at a time when the United States and its allies are increasingly focused on secure, domestic and responsible sources of copper for power, infrastructure, electrification, advanced manufacturing, data centers and national security supply chains.

The acquisition will provide Copper One with 100% ownership of Majuba Hill, subject to the completion of closing documentation and customary closing conditions. The Company believes that securing a 100% interest in the Project will provide greater flexibility to advance exploration activities, refine drill targeting, evaluate potential strategic alternatives, and position Majuba Hill within an evolving North American copper market.

"We are pleased to move toward securing 100% ownership of the Majuba Hill Project," said David Greenway, President and Chief Executive Officer of Copper One Resources Corp. "Full ownership of Majuba Hill provides the Company with increased flexibility to advance exploration activities, refine drill targeting, and evaluate future development opportunities. We believe the Project represents a significant exploration opportunity in Nevada, a leading mining jurisdiction, at a time when global demand for copper continues to be driven by electrification, power infrastructure, advanced manufacturing, data centers and energy transition initiatives. As concerns regarding a looming copper shortage continue to be discussed across the industry, we believe that consolidating ownership of Majuba Hill strengthens Copper One's position to advance the Project and pursue long-term value creation for shareholders."

Transaction Summary

Pursuant to the amendment, the purchase price payable on exercise of the option has been amended to US$1,300,000 in cash. The closing is expected to be completed pursuant to escrow instructions and related conveyance documents, including an assignment and deed with reservation of royalty, bill of sale and related closing deliverables.

Upon completion, the Project is expected to be held through BAM BAM Nevada Inc., a Nevada corporation and wholly owned subsidiary of Copper One.

The Company will provide additional updates as closing is completed and as exploration plans for Majuba Hill advance.

Copper One views the negotiated amendment as a major achievement for shareholders. By reducing the purchase price, representing a reduction of approximately US$2.7 million from the purchase consideration contemplated under the original option framework, the Company believes it has strengthened its ability to focus capital on technical work, exploration planning, drilling and long-term advancement of Majuba Hill.

About the Majuba Hill Copper-Silver-Gold Deposit, Nevada

Majuba Hill is Copper One's flagship copper-silver-gold exploration project located in Pershing County, Nevada. Nevada ranked first globally in the Fraser Institute's Annual Survey of Mining Companies 2025. The Majuba Hill Project is in Pershing County, Nevada, a well-established mining region with extensive infrastructure and a long history of mineral exploration and development.

The Majuba Hill property covers approximately 9,684 acres and is located about 113 road kilometres, or 70 miles, southwest of Winnemucca, Nevada, and 251 kilometres, or 156 miles, northeast of Reno. The project is accessible by well-maintained county roads from the Imlay, Nevada exit on U.S. Interstate 80, followed by an approximately 23-mile drive west. Access to people, roads, power and water are fundamental considerations for advancing mineral projects, and Majuba Hill benefits from a strong infrastructure foundation in each of these areas. This represents a meaningful potential advantage compared to more remote projects, where infrastructure can be 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. Based on current drilling cost assumptions, the rough replacement value of this historical drilling is estimated at approximately US$12.1 million, providing Copper One with a valuable technical foundation as it continues to advance the project.

Recent Select Drilling At the Majuba Hill Project

Readers are cautioned that drill results are historical in nature and have not been independently verified by Copper One. Additional details regarding these drill results, including QA/QC procedures, sampling methodologies and technical disclosure, are available in the following news releases:

• MHB-30: News release dated September 24, 2024  

• MHB-32: News release dated May 22, 2025  

• MHB-34: News release dated June 9, 2025  

Exploration work at Majuba Hill has identified indications of a potentially large copper, silver and gold mineralized system, with geological characteristics consistent with porphyry-style copper mineralization. The Company believes Majuba Hill represents a compelling exploration opportunity in a top-tier jurisdiction, supported by scale, access, infrastructure, historical work and meaningful copper exploration potential.

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Copper Market Context

Recent copper price forecasts and market commentary from major financial institutions continue to highlight the strength of the copper market backdrop. Market reporting published in June 2026 reported that Goldman Sachs now sees copper prices at US$13,735 per metric tonne by the end of 2026 1 , more than 10% above its previous target of US$12,465 per metric tonne. Reuters also reported in April 2026 that Goldman Sachs maintained a forecast for copper to average US$12,650 per metric tonne in 2026. Goldman Sachs Research has also published a longer-term copper forecast of US$15,000 per metric tonne by 2035, while identifying grid and power infrastructure,  including AI and Defence-related energy demand, as key structural copper demand drivers.

Citi has also published a constructive copper outlook. Market reporting published in June 2026 reported that Citigroup had targeted US$14,500 per metric tonne sometime in June 2026 and US$15,000 per metric tonne within one year, citing weaker supply growth, resilient demand from AI and the energy transition, and lingering concerns around U.S. refined copper tariffs. 2

Copper One cautions that commodity price forecasts are provided for market context only. They do not imply that Majuba Hill has demonstrated economic viability, that a mineral resource will be defined, or that future commodity prices will be achieved.

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.

Market Awareness

The Company has entered into an agreement with Gold Standard Media, LLC ( “GSM” ), a Texas-based media firm. Under the agreement dated June 19, 2026, GSM will provide marketing and promotional services for a total consideration of up to USD $1,000,000 for a period of six (6) months. GSM has a business address located at 723 W University Avenue, Georgetown, TX 78626 and can be contacted at +1 512-843-1723 or ceo@goldstandardir.com. GSM and its principals are arm’s length from the Company. The Company shall not issue options or other securities in consideration for GSM’s services.

Restricted Share Units (“RSU”)

The Company further announces its intention to enter into RSU Agreements with Consultants, Directors and Officers for a total of 3,000,000 RSUs pursuant to the Company’s omnibus incentive plan (the " Omnibus Plan ") adopted by the board of directors on October 9, 2025 and further ratified and approved by the Company’s shareholders on December 4, 2025.

About Copper One Resources Corp.

Copper One Resources Corp. focuses on advancing copper, copper/silver/gold, and critical metals projects in North America to support growing demand driven by electrification, AI infrastructure, renewable energy, and grid modernization. The Company’s flagship asset is the Majuba Hill Copper-Silver-Gold District in Nevada, located approximately 156 miles (251 kilometres) from Reno. Copper One also holds an option to earn up to a 100% interest in the Redhill Property, a copper-focused exploration opportunity located south of Ashcroft, British Columbia, within the Kamloops Mining District. The project covers approximately 4,736.38 hectares across 18 mineral claims and is prospective for volcanogenic massive sulphides mineralization, a deposit style commonly associated with copper, zinc, silver, and gold.  In addition, the Company owns the 100%-owned Redonda Copper-Molybdenum Project, a district-scale porphyry-style copper-molybdenum exploration asset located near Campbell River within British Columbia’s Vancouver Mining Division, covering approximately 2,746.46 hectares across nine mineral claims.

Copper One Resources is advancing its projects through systematic exploration and technical evaluation, with a focus on responsible exploration practices, technical transparency, and long-term value creation.

All stakeholders are encouraged to follow the Company on its social media profiles on LinkedIn and X.com , and to subscribe for updates at https://copperone.com/ .

Neither the Canadian Securities Exchange nor its Market Regulator (as that term is defined in the policies of the Canadian Securities Exchange) accepts responsibility for the adequacy or accuracy of this release.

On Behalf of Copper One Resources Corp.

“David Greenway”

David C. Greenway

President & CEO

For further information, please contact:

Brent Rusin

Corporate Communications

E: info@copperone.com

P: 1 (236) 788-0643

VISIT OUR WEBSITE FOR MORE DETAILS

www.copperone.com

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Forward-Looking Information

This news release contains certain forward-looking statements and forward-looking information (collectively, “Forward-Looking Statements”) within the meaning of applicable Canadian securities laws. Forward-Looking Statements are frequently identified by such words as “anticipates,” “believes,” “expects,” “intends,” “plans,” “projects,” “targets,” “may,” “will,” or similar expressions.

Forward-Looking Statements in this news release include, but are not limited to, statements regarding the Company’s plans and objectives, including its strategy to enhance market awareness, expand its shareholder base, and advance its mineral projects.

These Forward-Looking Statements are based on reasonable assumptions and estimates of management at the date of this news release, including, without limitation, that the Company will be able to execute its business plans as currently contemplated, that general market conditions will remain stable, and that the Company will have access to sufficient capital to support its activities.

Forward-Looking Statements involve known and unknown risks, uncertainties, and other factors which may cause the actual results, performance, or achievements of the Company to differ materially from any future results, performance, or achievements expressed or implied by such Forward-Looking Statements. Such factors include, among others, risks related to general market and economic conditions, fluctuations in commodity prices, including copper, risks inherent in mineral exploration and development, the Company’s ability to obtain financing on acceptable terms or at all, and changes in applicable laws and regulations. Additional risk factors are discussed in the Company’s continuous disclosure filings available under the Company’s profile on SEDAR+ at www.sedarplus.ca .

Although the Company has attempted to identify important factors that could cause actual actions, events, or results to differ materially from those described in Forward-Looking Statements, there may be other factors that cause actions, events, or results not to be as anticipated, estimated, or intended. Accordingly, readers should not place undue reliance on Forward-Looking Statements. The Company undertakes no obligation to update any Forward-Looking Statements except in accordance with applicable securities laws.

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1  Goldman Sachs Research, "Copper Prices Are Forecast to Decline Somewhat from Record Highs in 2026," Dec. 11, 2025. Source: https://www.goldmansachs.com/insights/articles/copper-prices-forecast-to-decline-from-record-highs-in-2026

2  Mining.com, "Copper price: Goldman, Citi make bullish calls on supply woes," Jun. 2, 2026. The article reported that Goldman Sachs saw copper prices at US$13,735 per metric tonne by the end of 2026 and that Citi targeted US$14,500 per metric tonne in June 2026 and US$15,000 per metric tonne within one year. Source: https://www.mining.com/copper-price-goldman-citi-make-bullish-calls-on-supply-woes/

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