ARRANGEMENTS FOR 2021 ANNUAL GENERAL MEETING

IMPORTANT INFORMATION FOR SHAREHOLDERS

ARRANGEMENTS FOR 2021 ANNUAL GENERAL MEETING AND CLASS MEETINGS

THIS LETTER IS SUPPLEMENTARY TO, AND MUST BE READ IN CONJUNCTION WITH, THE NOTICE OF AGM AND CLASS MEETINGS DATED 24 MARCH 2021

Dear Shareholder

Antofagasta plc's (the "Company's") Annual General Meeting (the "AGM") is to be held at 2:00 pm on 12 May 2021 at the Company's registered office: Cleveland House, 33 King Street, St James's, London SW1Y 6RJ. Separate meetings of the ordinary shareholders and preference shareholders (the "Class Meetings") will follow directly after the AGM.

COVID-19 Restrictions

In light of the ongoing COVID-19 pandemic and the UK Government's restrictions on public gatherings, we currently expect shareholders will not be able to attend the AGM or Class Meetings in person. Shareholders who attempt to attend in person should expect to be refused entry.

The Company will ensure that the necessary quorum requirement is satisfied, but we do not expect the Directors or members of the Executive Committee to attend the meetings in person.

Remote Engagement

However, the Company is keen to ensure that shareholders have an opportunity to engage in the AGM and Class Meetings to the maximum extent possible.  Accordingly, we will offer facilities for shareholders to watch and listen to the AGM (and the relevant Class Meeting(s)) via an audio and visual broadcast. The reverse side of this page contains details on accessing that broadcast.

The Directors and members of the Executive Committee will appear at the AGM by video-link and the Chairman and the CEO will each make a presentation.  Shareholders will be able to ask questions, either in writing via the meeting website, or by telephone.

Voting

Unfortunately, due to constraints in the Company's articles of association, shareholders are not able to vote at the AGM or Class Meetings via the website. 

That said, the Board is keen to ensure that all shareholders exercise their right to vote and strongly recommends that you vote on all resolutions by submitting an online proxy appointment form, appointing the Chairman as your proxy, in accordance with paragraph 2 of the Important Notes to the Notice of AGM (set out on page 9), as early as possible and, in any event, by no later than 2:00 pm on 10 May 2021. We also recommend that you vote on the resolutions at the Class Meetings in the same way by submitting an online proxy appointment form in relation to the relevant Class Meeting(s) no later than 2:10 pm and 2:15 pm on 10 May 2021 for the Class Meetings of the ordinary shareholders and preference shareholders respectively. If you appoint a person other than the Chairman of the meetings as your proxy, that person is expected to be refused entry to the meetings and your votes will not be counted.

As you will see, the Company is proposing to adopt new articles of association at the AGM to permit the Company to take advantage of electronic voting at future meetings.

Next Steps

Shareholders should continue to monitor the Company's website and announcements for any further updates regarding the AGM and the Class Meetings.

The Board would like to thank all shareholders for their understanding and we look forward to engaging with as many of you as possible at the AGM.

Julian Anderson

Company Secretary

Antofagasta plc

Cleveland House

33 King Street

St James's

London SW1Y 6RJ

31 March 2021