April 1, 2005

SUNRISE DIAMONDS PLC - PROSPECTUS PUBLISHED

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 satisfy bona fide market claims only, where Tertiary Minerals Shareholders have sold part of their shareholding prior to the ex-entitlement date) 3.00 p.m. on 22 April 2005
Latest time and date for receipt of completed Application Forms and payment in full under the Offer 3.00p.m. on 26 April 2005
Dispatch of definitive share certificates for the Offer Shares 5 May 2005


Further info: Patrick Cheetham, Executive Chairman, Tertiary Minerals plc.
Tel: 01625-626203

John Greenhalgh/Ron Marshman, City of London PR Ltd.
Tel: 0207-628 5518