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Capstone Copper Files Technical Report for Santo Domingo Project

Technical Reports (NI 43-101)

September 13, 2024

Capstone Copper Files Technical Report for Santo

Domingo Project

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

has today filed on SEDAR+ a National Instrument 43-101 (“NI 43-101”) compliant technical report titled “Santo

Domingo Project NI 43-101 Technical Report and Feasibility Study Update” for the upd ated Santo Domingo

feasibility study announced on July 31, 2024.

The Technical Report was prepared in accordance with Canadian Securities Administrator’s NI 43-101Standards

of Disclosure for Mineral Projects; and is ava ilable under the Company’s profile on SEDAR+ at www.sedarplus.ca

and the Company’s web site at www.capstonecopper.com.

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 mi ne, located in the Atacama region, Chile. In addition, we own the fully permitted

Santo Domingo copper-iron-gold project, located approxim ately 30 kilometres northea st 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 innova tion, optimization and safe and resp onsible production throughout our

portfolio of assets. We focus on profitability and disciplined c apital 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.

Further information is available at www.capstonecopper.com

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This document 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”). These forward-looking statements are made as of the date of this

document 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.

Forward-looking statements relate to future events or future performance and reflect Company management's

expectations or beliefs regarding future events and includ e, but are not limited to, stat ements with respect to the

estimation of mineral reserves and mineral resources, the conversion of mineral resources to mineral reserves, the

ability to successfully complete the strategic review process, the ability to further enhance the value of the project,

the expected timing for commencement of construction of the Santo Domingo project, the future validity of the

DL600, our ability to fund future explor ation activities, the market for projec t debt, Capstone's ability to raise its

equity contribution to the project, the realization of miner al reserve estimates, the timing and amount of estimated

future production, costs of production, capital and construction expenditures, success of mining operations, success

of mineral exploration, environmental risks, the timing of the receipt of per mits, the timing and terms of a power

purchase agreement, unanticipated reclamation expenses, ti tle disputes or claims and limitations on insurance

coverage. In certain cases, forward-looking statements c an be identified by the use of words such as "plans",

"expects" or "does not expect", "is ex pected", "outlook", "budget", "scheduled", "estimates", "forecasts", "intends",

"anticipates" or "does not anticipate", or "believes", or variations of such words and phrases or statements that

NEWS RELEASE

TSX:CS ● ASX:CSC ● capstonecopper.com

certain actions, events or results "may", "could", "would", "might" or "will be taken", "occur" or "be achieved" or the

negative of these terms or comparable terminology. In this document certain forward-looking statements are

identified by words including “explore”, “potential”, “will”, "scheduled", "plan", "planned" , "estimates", “estimated”,

“estimate”, "projections", "projected", “await receipt” and "expected". Forward-looking statements are based on a

number of assumptions which may prove incorrect, includi ng, but not limited to, the de velopment potential of the

Santo Domingo project and current and future commodity prices and exchange rates. By their very nature forward-

looking statements involve known and unknown risks, uncerta inties and other factors which may cause the actual

results, performance or achievements of the Company to be materially different from any future results, performance

or achievements expressed or implied by the forward- looking statements. Such fa ctors include, among others,

changes in project parameters as plans continue to be refined; future prices of commodities; possible variations in

mineral resources and reserves, grade or recovery rate s; accidents; dependence on key personnel; labour pool

constraints; labour disputes; availability of infrastructure required for the development of mining projects; delays in

obtaining governmental approvals, financing or in the co mpletion of development or construction activities;

objections by the communities or environmental lobby of the Santo Domingo mine and associated infrastructure

and other risks of the mining industry as well as those factor s detailed from time to time in the Company's interim

and annual financial statements and managem ent's discussion and analysis of t hose statements, all of which are

filed and available for review on SEDAR+ at www.sedarp lus.ca. Although the Company has attempted to identify

important factors that could cause actu al actions, events or results to diffe r 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. There can be no assurance that forward-looking stat ements will prove to be accurate, as

actual results and future events could differ materially fr om those anticipated in such statements. Accordingly,

readers should not place undue reliance on forward looking statements.

Non-GAAP and Other Performance Measures

The Company uses certain performance measures in its analysis. "C1 Cash Costs" and "Total Project Operating

Cost" are Non-GAAP performa nce measures. These Non-G AAP performance measures are included in this

document because these statistics are key performance measures that management uses to monitor performance,

to assess how the Company is performing, and to plan and assess the overall effectiveness and efficiency of mining

operations. These performance measures do not have a sta ndard meaning within IFRS and, therefore, amounts

presented may not be comparable to similar data present ed by other mining companies. These performance

measures should not be consider ed in isolation as a substitute for measures of performance in accordance with

IFRS.

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Contact Information

Jerrold Annett, SVP, Strategy & Capital Markets

647-273-7351

[email protected]

Daniel Sampieri, Director, Investor Relations & Strategic Analysis

437-788-1767

[email protected]

Michael Slifirski, Director, Investor Relations, APAC Region

61-412-251-818

[email protected]