Chinguetti Drilling Update

Sterling Energy PLC 02 June 2005 2 JUNE 2005 STERLING ENERGY PLC CHINGUETTI DRILLING UPDATE Sterling Energy, the AIM listed (symbol: SEY) independent oil & gas exploration and production company, note that the following announcement was made earlier today by Hardman Resources Ltd: Hardman Resources Ltd ('Hardman') announces that the drilling rig 'Stena Tay' has completed the drilling of the wells required for the first phase of the Chinguetti development project, offshore Mauritania. This drilling program included 5 new oil producers, 5 water injectors to maintain reservoir pressure, and 1 gas injection well drilled on the Banda discovery for disposal of the Chinguetti associated gas. The Chinguetti early development well drilled in late 2003 will also be tied into the production system, resulting in the planned 6 producing wells being on stream at the end of the first phase of development. During the drilling of the Banda gas injection well a number of cores were cut and fluid samples taken, to aid in the continuing evaluation of this discovery. The 'West Navigator' drilling rig remains in the Chinguetti field and is continuing work on the installation of well completion equipment. As of 31 May 2005 sand completion equipment had been installed on 7 of the 10 new wells, and this work will be followed by the installation of the production tubing and subsea trees before connecting the wells to the Berge Helene Floating Production Storage and Offtake (FPSO) Vessel for production. Drilling results on Chinguetti were positive, meeting or exceeding expectations. The completion of the drilling phase removes one significant element of forward project risk and confirms that the volume of oil-in-place is at least as expected. On the assumption that early well performance remains in line with forecasts, Hardman anticipates that this will result in an increase in proven reserves when it carries out its initial reserves redetermination. The project is now over 71% complete and the target date for first oil from the Chinguetti field remains Quarter 1, 2006. The 'Stena Tay' is preparing to move to the Canary Islands for upgrade works before returning in July to commence the 2005/6 exploration and appraisal program. The forward drilling schedule and selection of the exploration and appraisal targets are the subject of a number of key joint venture meetings to be held from mid-June. SCOTT SPENCER, DIRECTOR Note: In accordance with Australian Stock Exchange Limited listing requirements, the geological information supplied in this report has been based on information provided by geologists who have had in excess of five years experience in their field of activity. Harry Wilson, Chief Executive of Sterling Energy Plc, said: 'We are extremely pleased that the Chinguetti drilling results met our expectations, thereby confirming our belief in the project. The next 12 months will be very exciting for Sterling as we remain on track for first oil from Chinguetti in first quarter 2006.' Enquiries Sterling Energy (01582 462 121) Web site: www.sterlingenergyplc.com Harry Wilson Graeme Thomson Citigate Dewe Rogerson (020 7638 9571) Nina Soon Evolution Securities (020 7071 4300) Rob Collins / Henry Turcan This information is provided by RNS The company news service from the London Stock Exchange

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