Offer Update

Antofagasta PLC
04 April 2006


                                   


For immediate release


Update: Recommended cash offer for Tethyan Copper Company Limited ('Tethyan')


London, 4 April 2006 - Antofagasta PLC ('Antofagasta') confirms that the closing
date for its recommended cash offer for Tethyan has been extended, such that it
will now close at 7pm, Sydney Australia time on 28 April 2006.


Antofagasta encourages all Tethyan shareholders to accept its offer as soon as
possible.







                                   Enquiries - Santiago
                                   --------------------
Enquiries - London                 
------------------                 Antofagasta Minerals S.A.
Antofagasta PLC                    Alejandro Rivera
Tel: [phone]              Tel: [phone]
www.antofagasta.co.uk              Email: [e-mail]
Desmond O'Conor                    
Email: [e-mail]

                                   Enquiries - Australia
                                   -----------------------
                                   N M Rothschild & Sons (Australia) Ltd (financial
                                   advisers)
Bankside Consultants               Tel: [phone]
Tel: [phone]              Marshall Baillieu
Mob: [phone]              Chris Forman
Keith Irons      
Email: [e-mail]          Jackson Wells Morris (public relations advisers)
                                   Tel: [phone]
                                   Benjamin Haslem
                                   Jakob Webster





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