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Capstone Copper Announces Offering of US$500 Million Senior Notes Due 2033

Financings Debt & Credit Facilities

March 20, 2025

Capstone Copper Announces Offering of US$500 Million

Senior Notes Due 2033

All amounts in US$ unless otherwise indicated

Vancouver, British Columbia – Capstone Copper Corp. (“Capstone” or the “Company”) (TSX:CS)

(ASX:CSC) announces that it is launching an offering of $500 million aggregate principal amount of senior

notes due 2033 (the “Notes”). The aggregate principal amount, interest rate and other terms of the Notes will

be determined at pricing and are dependent upon market conditions and other factors.

The Notes will be senior unsecured obligations of the Company and will be guaranteed by each of the

Company’s subsidiaries that guarantees its senior secured revolving credit facility . Interest on the Notes will

accrue from the issue date and will be payable semi-annually.

The Company intends to apply the gross proceeds from the sale of the Notes to repay project financing debt

at its Mantoverde S.A. subsidiary, to pay down debt on the Company’s senior secured revolving credit facility,

and for general corporate purposes.

The Notes will be offered and sold in the United States only to persons reasonably believed to be qualified

institutional buyers in accordance with Rule 144A under the United States Securities Act of 1933, as amended

(the “Securities Act”), and to non- U.S. persons outside the United States in compliance with Regulation S

under the Securities Act. The Notes will be offered and sold in Canada on a private placement basis pursuant

to certain prospectus exemptions.

The offer and sale of the Notes will not be registered under the Securities Act and the Notes may not be

offered or sold in the United States or to U.S. persons absent registration or an applicable exemption from the

registration requirements of the Securities Act and applicable state securities laws. This news release shall

not constitute an offer to sell the Notes, nor shall there be any offer or sale of the Notes in any jurisdiction in

which such offer, solicitation or sale would be unlawful.

ABOUT CAPSTONE COPPER CORP.

Capstone Copper Corp. is an Americas -focused copper mining company headquartered in Vancouver,

Canada. We own and operate the Pinto Valley copper mine located in Arizona, USA, the Cozamin copper-

silver mine located in Zacatecas, Mexico, the Mantos Blancos copper- silver mine located in the Antofagasta

region, Chile, and 70% of the Mantoverde copper-gold mine, located in the Atacama region, Chile. In addition,

we own the fully permitted Santo Domingo copper- iron-gold project, located approximately 30 kilometres

northeast of Mantoverde in the Atacama region, Chile, as well as a portfolio of exploration properties in the

Americas.

Capstone Copper’s strategy is to unlock transformational copper production growth while executing on cost

and operational improvements through innovation, optimization and safe and responsible production

throughout our portfolio of assets. We focus on prof itability and disciplined capital allocation to surface

stakeholder value. We are committed to creating a positive impact in the lives of our people and local

communities, while delivering compelling returns to investors by responsibly producing copper to meet the

world’s growing needs.

NEWS RELEASE

TSX:CS ● ASX:CSC ● capstonecopper.com

Contact Information

Daniel Sampieri, Vice President, Investor Relations

437-788-1767

[email protected]

Michael Slifirski, Director, Investor Relations, APAC Region

61-412-251-818

[email protected]

Claire Stirling, Manager, Investor Relations

416-831-8908

[email protected]

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This press release may contain “forward -looking information” within the meaning of Canadian securities

legislation and “forward- looking statements” within the meaning of the United States Private Securities

Litigation Reform Act of 1995 (collectively, “forward-looking statements”).

In certain cases, forward -looking statements can be identified by the use of words such as “anticipates”,

“approximately”, “believes”, “budget”, “estimates”, “expects”, “forecasts”, “guidance”, “intends”, “plans”,

“scheduled”, “target”, or variations of such words and phrases, or statements that certain actions, events or

results “be achieved”, “could”, “may”, “might”, “occur”, “should”, “will be taken” or “would” or the negative of

these terms or comparable terminology . Forward-looking statements include, but are not limited to,

statements with respect to the Company's intention to offer the Notes, subject to market and other conditions,

the intended use of proceeds from the offering and the Company’s business strategy. These forward-looking

statements and information reflect the Company's current views with respect to future events and are

necessarily based upon a number of assumptions that, while considered reasonable, are inherently subject to

significant operational, business, economic, market and regul atory uncertainties and contingencies. These

assumptions include the timing and success of the Notes offering. Furthermore, such forward -looking

statements involve a variety of known and unknown risks, uncertainties and other factors which may cause

the actual plans, intentions, activities, results, performance or achievements of the Company to be materially

different from any future plans, intentions, activities, results, performance or achievements expressed or

implied by such forward -looking statements. Such risks include, without limitation, the risks included in our

continuous disclosure filings on SEDAR+ at www.sedarplus.ca. These forward-looking statements are made

as of the date of this press release and the Company does not intend, and does not assume any obligation,

to update these forward- looking statements, except as required under applicable securities legislation.

Although the Company has attempted to identify important factors that could cause actual actions, events,

conditions, results, performance or achievements to differ materially from those described in forward- looking

statements, there may be other factors t hat cause actions, events, conditions, results, performance or

achievements to differ from those anticipated, estimated or intended. The Company cautions that the

foregoing lists of important assumptions and factors are not exhaustive. Other events or circumstances could

cause actual results to differ materially from those estimated or projected and expressed in, or implied by, the

forward-looking statements contained herein. There can be no assurance that forward-looking statements will

prove to be accurate, as actual results and future events could differ materially from those anticipated in such

statements. Accordingly, readers should not place undue reliance on forward-looking statements.