Diamond Spin Off

Tertiary Minerals PLC
1 April 2005


                             TERTIARY MINERALS PLC


                     SPIN-OFF OF FINNISH DIAMOND INTERESTS

Tertiary Minerals plc ('Tertiary Minerals' or 'the Company') is pleased to
announce that, further to the announcement made on 29 March 2005 regarding the
public offer of shares ('Offer') to be made by its wholly-owned subsidiary,
Sunrise Diamonds plc ('Sunrise Diamonds'), the prospectus relating to the Offer
is today being published and posted to eligible Tertiary Minerals shareholders.

The timetable for the Offer is confirmed as follows:

Record Date for the Offer                                        Close of
                                                                 business on 
                                                                 29 March 2005

Latest time and date for splitting of Applications Forms (to     3.00 p.m. on 
satisfy bona fide market claims only, where Tertiary Minerals    22 April 2005
Shareholders have sold part of their shareholding prior to the
ex-entitlement date)

Latest time and date for receipt of completed Application Forms  3.00p.m. on 
and payment in full under the Offer                              26 April 2005

Dispatch of definitive share certificates for the Offer Shares   5 May 2005

For further information please contact:

Patrick Cheetham, Executive Chairman, Tertiary Minerals plc. Tel: [phone]
Ron Marshman/John Greenhalgh, City of London PR Limited. Tel: [phone]



                      This information is provided by RNS
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