Annual Information Update

Antofagasta PLC 02 May 2007 Antofagasta plc ANNUAL INFORMATION UPDATE London, 2 May 2007 This annual information update is made by Antofagasta plc (the 'Company') in accordance with Prospectus Rule 5.2. The information detailed below has been published or made available to the public over the previous 12 months. The information referred to below was correct at the time it was published but may now be out of date. A. Announcements made via a Regulatory Information Service The following announcements were made via a Regulatory Information Service: Date Description of Announcement 20 April Annual Report and Financial Statements and Notice of Annual 2007 General Meeting 22 March Notification of major interests in shares 2007 13 March Preliminary Results Announcement 2007 31 January Quarterly Production Report Q4 2006 2007 24 January Notification of major interests in shares 2007 19 December Director shareholding 2006 15 December Voting rights and capital 2006 12 December Update regarding Minera Los Pelambres: El Mauro Tailings Dam 2006 29 November Quarterly Financial Report Q3 2006 2006 14 November Agreement with Ascendant Copper Corporation 2006 07 November Minera Los Pelambres: El Mauro Tailings Dam project 2006 31 October Quarterly Production Report Q3 2006 2006 29 September Change of Directors 2006 26 September Interim dividend declaration 2006 8 September Interim Report and Financial Statements 2006 29 August Interim Results Announcement 2006 24 August Update regarding cash offer for Equatorial Mining Ltd 2006 16 August Update regarding takeover offer for Equatorial Mining Ltd 2006 15 August AMP announce intention to accept Antofagasta's offer for 2006 Equatorial Mining Ltd 15 August Cash offer for Equatorial Mining Ltd 2006 15 August Sierra Gorda Copper Pty Ltd: Bidder's statement in relation to the 2006 cash offer to acquire all the ordinary shares in Equatorial Mining Ltd 01 August Quarterly Production Report Q2 2006 2006 14 July Antofagasta to form joint venture with Anglogold 2006 20 June Luksic family interest 2006 19 June Admission to the Official List 2006 19 June 4 for 1 bonus issue of ordinary shares 2006 14 June Annual General Meeting statement 2006 14 June Resolutions passed at Annual General Meeting 2006 06 June Annual Information Update 2006 25 May Quarterly Financial Report Q1-2006 2006 22 May Correction of Explanation of Special Business at AGM 2006 16 May Dividends - amount payable in sterling 2006 9 May Annual Report and Financial Statements and Notices of Meetings 2006 3 May Quarterly Production Report Q1 2006 2006 Copies of these announcements can be obtained from the London Stock Exchange website, www.londonstockexchange.com/marketnews, and from the investor relations pages of the Company's website, www.antofagasta.co.uk. B. Documents filed at Companies House The following documents were filed with the Registrar of Companies in England and Wales on or around the dates indicated: Date Document Filed 01 March Articles of association dated 14 June 2006 2007 17 October Form 288a, appointment of director 2006 11 October Form 288b, resignation of director 2006 17 August Form 363a, return made up to 19 June 2006 2006 11 July Form 88(3), particulars of a contract relating to shares allotted as 2006 fully or partly paid up otherwise than in cash dated 21 June 2006 11 July Form 88(2), return of allotment of shares dated 19 June 2006 2006 03 July Form 123, notice of increase in nominal capital dated 14 June 2006 2006 03 July Resolution disapplying pre-emption rights, adopting new articles and 2006 approving authority of the allotment of security dated 14 June 2006 and articles of association dated 14 June 2006 27 June Resolution varying shareholders rights dated 14 June 2006 2006 23 June Group accounts made up to 31 December 2005 2006 Copies of these documents are available to download from the Companies House website, www.companieshouse.gov.uk, or can be obtained from Companies House, Crown Way, Maindy, Cardiff CF14 3UZ. C. Documents submitted to the Financial Services Authority The following documents were filed with the Financial Services Authority on or around the dates indicated: Date Document 20 April Annual Report and Financial Statements and Notice of Annual 2007 General Meeting 8 September Interim Report and Financial Statements 2006 22 May Letter Correcting Explanation of Special Business 2006 9 May 2006 Proposed Articles of Association 9 May 2006 Annual Report and Accounts 2005 including Notice of Annual General Meeting and Notices of Class Meetings All of these documents were sent to shareholders on or around the same date. These documents can be viewed at the Document Viewing Facility situated at The Financial Services Authority, 25 North Colonnade, Canary Wharf, London E14 5HS. Copies of these documents can also be obtained from the financial information and investor relations pages of the Company's website, www.antofagasta.co.uk. D. Documents lodged with the Australian Securities Exchange in Australia The following documents were submitted to the Australian Securities Exchange by the Company or its wholly-owned subsidiaries Atacama Copper Pty Limited or Sierra Gorda Copper Pty Limited on or around the dates indicated: Date Document 15 September Change in substantial holding in Equatorial Mining 2006 Limited 8 September Section 603(3) notice to Equatorial Mining Limited 2006 8 September Change in substantial holding in Equatorial Mining 2006 Limited 6 September Compulsory acquisition notice to Equatorial Mining 2006 Limited 25 August 2006 Change in substantial holding in Equatorial Mining Limited 24 August 2006 Minimum acceptance condition fulfilled 17 August 2006 Notice of dispatch of bidder's statement for Equatorial Mining Limited 16 August 2006 FIRB condition fulfilled by Antofagasta plc for Equatorial Mining Limited 16 August 2006 Becoming a substantial shareholder in Equatorial Mining Limited 15 August 2006 Intention to accept Antofagasta plc's offer 15 August 2006 Notice of record date to Equatorial Mining Limited 15 August 2006 Bidder's statement for Equatorial Mining Limited 15 August 2006 Takeover offer by Antofagasta plc for Equatorial Mining Limited 9 May 2006 Letter to Shareholders in Tethyan Copper Company Limited 1 May 2006 Change in substantial holding in Tethyan Copper Company Limited Copies of these documents can be obtained from the Australian Securities Exchange website www.asx.com.au/asx/statistics/announcementSearch.do (entering the ASX codes TYC and EQM). Enquiries Issued by Antofagasta plc Bankside Consultants Tel: +44 20 7808 0988 Tel: +44 20 7367 8873 www.antofagasta.co.uk Desmond O'Conor Keith Irons Email: doconor@antofagasta.co.uk Email: keith@bankside.com Hussein Barma Oliver Winters Email: hbarma@antofagasta.co.uk Email: oliver.winters@bankside.com This information is provided by RNS The company news service from the London Stock Exchange

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