NEWS RELEASE, 27 OCTOBER 2025

NOT FOR DISTRIBUTION IN OR INTO OR TO ANY PERSON LOCATED OR RESIDENT IN THE UNITED STATES, ITS TERRITORIES AND POSSESSIONS, ANY STATE OF THE UNITED STATES OR THE DISTRICT OF COLUMBIA OR TO ANY U.S. PERSON

PUBLICATION OF PROSPECTUS

The following prospectus has been approved by the Financial Conduct Authority and is available for viewing:

Prospectus dated 24 October 2025 for the listing of U.S.$600,000,000 5.625 per cent. Notes due 2035 issued by Antofagasta plc.

The Prospectus has been filed with the Financial Conduct Authority. To view the full document, please follow the link below:

https://www.antofagasta.co.uk/prostectus2025

A copy of the Prospectus has also been submitted to the National Storage Mechanism and will shortly be available for inspection at the following link:

https://data.fca.org.uk/#/nsm/nationalstoragemechanism

For further information, please contact:

Investors - London                                                                                 Media - London

Rosario Orchard                      [email protected]             Sara Powell             [email protected]

Robert Simmons                     [email protected]           Ben Brewerton

Telephone                               +44 20 7808 0988                                  Nck Hennis

                                                                                               Telephone               +44 20 3727 1000

                                                                                                                   Media - Santiago

                                                                                                                   Pablo Orozco           [email protected]

                                                                                                                   Carolina Pica           [email protected]

                                                                                                                   Telephone               +56 2 2798 7000

DISCLAIMER - INTENDED ADDRESSEES

Please note that the information contained in the Prospectus may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Prospectus) only and is not intended for use and should not be relied upon by any person outside these countries and/or to whom the offer contained in the Prospectus is not addressed. Prior to relying on the information contained in the Prospectus you must ascertain from the Prospectus whether or not you are part of the intended addressees of the information contained therein.

This announcement is not an offer, solicitation or sale of securities in the United States or any other state or jurisdiction, and there shall not be any offer, solicitation or sale of securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction. The securities described in this announcement will only be offered in the United States to "qualified institutional buyers" as defined in Rule 144A under the U.S. Securities Act of 1933, as amended (the "Securities Act"), and outside the United States to non-U.S. persons in offshore transactions in accordance with Regulation S thereunder. The Notes have not been and will not be registered under the Securities Act, or under any state securities laws, and 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. This information is for your internal use and may not be forwarded or redistributed to any other persons.

Your right to access this service is conditional upon complying with the above requirement.

The Notes are not intended to be offered, sold or otherwise made available to and should not be offered, sold or otherwise made available to any retail investor in the European Economic Area ("EEA"). For these purposes, a retail investor means a person who is one (or more) of: (i) a retail client as defined in point (11) of Article 4(1) of MiFID II; or (ii) a customer within the meaning of Directive (EU) 2016/97 (as amended, the "Insurance Distribution Directive"), where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II. Consequently, no key information document required by Regulation (EU) No 1286/2014 (as amended, the "UK PRIIPs Regulation") for offering or selling the Notes or otherwise making them available to retail investors in the EEA has been prepared and therefore offering or selling the Notes or otherwise making them available to any retail investor in the EEA may be unlawful under the PRIIPs Regulation.

The Notes are not intended to be offered, sold or otherwise made available to and should not be offered, sold or otherwise made available to any retail investor in the UK. For these purposes, a retail investor means a person who is one (or more of): (i) a retail client, as defined in point (8) of Article 2 of Regulation (EU) No 2017/565 as it forms part of domestic law by virtue of the EUWA; (ii) a customer within the meaning of the provisions of the Financial Services and Markets Act 2000 (as amended, "FSMA") and any rules or regulations made under the FSMA to implement Directive (EU) 2016/97, where that customer would not qualify as a professional client, as defined in point (8) of Article 2(1) of UK MiFIR. Consequently, no key information document required by Regulation (EU) No 1286/2014 as it forms part of domestic law by virtue of the EUWA (the "UK PRIIPs Regulation") for offering or selling the Notes or otherwise making them available to retail investors in the UK has been prepared and therefore offering or selling the Notes or otherwise making them available to any retail investor in the UK may be unlawful under the UK PRIIPs Regulation.

The information in this announcement is only being distributed to and is only directed at, persons who are outside the UK or persons in the UK that are (i) investment professionals falling within Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (the "Order") or (ii) high net worth entities, and other persons to whom it may lawfully be communicated, falling within Article 49(2)(a) to (d) of the Order (each such person being referred to as a "relevant person"). In the UK, the Notes are only available to, and any invitation, offer or agreement to subscribe, purchase or otherwise acquire the Notes will be engaged in only with, relevant persons. Any person in the UK that is not a relevant person should not act or rely on this document or any of its contents. Any investment activity to which this announcement relates is reserved for relevant persons only and may only be engaged in by relevant persons.

This announcement does not constitute an offer to sell or a solicitation of an offer to buy or an advertisement in respect of Notes in any province or territory of Canada other than to investors that are "accredited investors" as defined in National Instrument 45-106 Prospectus Exemptions, or the Securities Act (Ontario), as applicable, and "permitted clients" as defined in National Instrument 31-103 Registration Requirements, Exemptions and Ongoing Registrant Obligations.

Neither this announcement nor anything contained herein shall form the basis of any contract or commitment whatsoever. Recipients of this announcement are not to construe the contents of this communication as legal, tax or investment advice and recipients should consult their own advisors in this regard.

ANY DISCLAIMERS OR OTHER NOTICES MAY APPEAR BELOW ARE NOT APPLICABLE TO THIS COMMUNICATION AND SHOULD BE DISREGARDED. SUCH DISCLAIMERS OR OTHER NOTICES WERE AUTOMATICALLY GENERATED AS A RESULT OF THIS COMMUNICATION HAVING BEEN SENT VIA BLOOMBERG OR ANOTHER EMAIL SYSTEM.