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Capstone Copper Publishes 2022 Sustainability Report

Corporate Updates

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December 4, 2023

Capstone Copper Publishes 2022 Sustainability Report

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

pleased to announce that it has published its 2022 Sustainability Report, “Growing Responsibly” (the

“Sustainability Report” or the “Report”). Growing Responsibly is Capstone’s inaugural sustainability report as

a combined company, continuing a practice established by its predecessor companies. The report has been

prepared in accordance with the Global Reporting Initiative (“GRI”) Standards and the SASB Metals and

Mining Sustainability Accounting Standard. The Report details the Company’s management approach and

performance on material sustainability topics across its operations for the period from January 1 to December

31, 2022.

John MacKenzie, Capstone’s CEO, commented, “I am pleased to share our first sustainability report for the

combined Capstone Copper. Integral to our values, we are committed in our drive to direct our resources and

the skills of our people to address some of the world’s biggest sustainability challenges. Our growth is

deliberate and responsible. Copper is an essential metal that facilitates decarbonization and electrification; it

plays a critical role in addressing the climate crisis, and we recognize our role as a responsible producer.”

2022 Sustainability Report Highlights

We underwent a steady and deliberate embedding of responsible practices in all areas. Some of our highlights

from 2022 include:

• We adopted a Sustainable Development Strategy (the “Strategy”), which will guide our future growth. The

Strategy serves as a blu eprint to ensure alignment with our vision and values. It is supported by five

strategic priorities (Climate, Water, Tailings, Biodiversity, and Communities), each of which has

meaningful targets.

• We continued to invest in significant development projects to extend the life of our mines and to make our

operations more efficient and competitive. The expansion of the Mantos Blancos sulphide processing plant

was completed in April 2022 and construction continued at the Mantoverde Development Project.

• In our first year of reporting as a combined company, we not only integrated our sustainability data streams

but enhanced our disclosure as well. We have included more in -depth commentary on processes for

community engagement and biodiversity management. We report sustainability metrics for all sites with

three years of data.

Some 2021-2022 data trends include:

• Total water consumption remained steady at 18.3 million cubic metres while total freshwater use

decreased by 14% (from 21% to 18%) primarily due to increased pit dewatering at Pinto Valley.

• Total energy use rose by 12% due to increases in both fuel (13%) and electricity (11%) use, mainly driven

by fuel for capital projects and electricity for new facilities. However, overall GHG emissions decreased by

1% due to significant reductions in emissions from both the Chile and Arizona grids.

• Per 200,000 hours in 2022, o ur L ost T ime Injury Frequency Rate (LTIFR) was 0.15 and our Total

Reportable Injury Frequency Rate (TRIFR) was 0.21. These metrics improved across most sites, falling

35% and 33% respectively, attributable to the emphasis on proactive safety management practices.

• Capstone’s combined workforce grew by 36% to 8,425 over 2021, driven by the temporary workforce

needs of key development and construction projects. Capstone’s employee demographics rem ained

relatively constant, with 8% women. Global new hire rate (22%) and turnover rate (14%) both decreased

in 2022 by 28% and 7% respectively, which is an indication of a relatively stable employee workforce.

NEWS RELEASE

TSX:CS ● capstonecopper.com

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The 2022 Sustainability Report is available on Capstone’s website at https://capstonecopper.com/responsibility/

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 product ion

throughout our portfolio of assets. We focus on profitability 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 sustainably 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 our expectations or beliefs

regarding future events. Our Sustainable Development Strategy goals and strategies are based on a number of

assumptions, including, but not limited to, the biodiversity and climate- change consequences; availability and

effectiveness of technologies needed to achieve our sustainability goals and priorities; availability of land or other

opportunities for conservation, rehabilitation or capacity building on commercially reasonable terms and our ability

to obtain any required external approvals or consensus for such opportunities; the availability of clean energy

sources and zero-emissions alternatives for transportation on reasonable terms; availability of resources to achieve

the goals in a timely manner, our ability to successfully implement new technology; and the performance of new

technologies in accordance with our expectations.

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”, “schedu led”,

“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. In this document certain forward- looking statements are identified by words including “anticipated”,

“expected”, “guidance” and “plan”. By their very nature, forward- looking statements involve known and unknown

risks, uncertainties and other factors that may cause our actual results, performance or achievements to be

materially different from any future results, performance or achievements expressed or implied by the forward-

looking statements. Such factors include, amongst others, risks related to inherent hazards associated with mining

operations, availability and quality of water, operating in foreign jurisdictions with risk of changes to governmental

regulation, compliance with governmental regulations, compliance with environmental laws and regulations,

reliance on approvals, licences and permits from governmental authorities and potential legal challenges to permit

applications, contractual risks, impact of climate change and changes to climatic conditions at our operations and

projects, changes in regulatory requirements and policy related to climate change and greenhouse gas (“GHG”)

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emissions, land reclamation and mine closure obligations, introduction or increase in carbon or other “green” taxes,

aboriginal title claims and rights to consultation and accommodation, risks relating to widespread epidemics or

pandemic outbreaks; the impact of communicable disease outbreaks on our workforce, risks related to construction

activities at our operations and development projects, suppliers and other essential resources and what effect those

impacts, if they occur, would have on our business, including our ability to access goods and supplies, the ability to

transport our products and impacts on employee productivity, the risks in connection with the operations, cash flow

and results of Capstone Copper relating to the unknown duration and impact of the epidemics or pandemics,

impacts of inflation, geopolitical events and the effects of global supply chain disruptions, , increased cost of

reclamation, any changes in law or interpretation of law may be difficult to react to in an efficient manner, maintaining

ongoing social licence to operate, seismicity and its effects on our operations and communities in which we operate,

dependence on key management personnel, potential conflicts of interest involving our directors and officers,

corruption and bribery, limitations inherent in our insurance coverage, labour relations, competition in the mining

industry including but not limited to competition for skilled labour, risks associated with joint venture partners and

non-controlling shareholders or associates, our ability to integrate new acquisitions and new technology into our

operations, cybersecurity threats, legal proceedings, , and other risks of the mining industry as well as those factors

detailed from time to time in the Company’s interim and annual financial statements and MD&A of those statements

and Annual Information Form, all of which are filed and available for review under the Company’s profile on SEDAR+

at www.sedarplus.ca. Although the Company has attempted to identify important factors that could cause our actual

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

there may be other factors that cause our results, performance or achievements not to be as anticipated, estimated

or intended. There can be no assurance that our forward-looking statements will prove to be accurate, as our actual

results, performance or achievements could differ materially from those anticipated in such statements. Accordingly,

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

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]