CALGARY, Canada, June 5 /PRNewswire/ --

- Additional 18 Per Cent Interest in and Operatorship of Iris Marin License Area

Addax Petroleum Corporation (TSX: AXC and LSE: AXC) ("Addax Petroleum" or the "Corporation") announces today that it has, subject to partial partner pre-emption rights, acquired an additional 18 per cent working interest in the Iris Marin license area offshore Gabon by the acquisition of a subsidiary of Sterling Energy plc ("Sterling"). Addax Petroleum will hold up to a 51.33 per cent working interest in the Iris Marin license area and, subject to Government approval, intends to become the operator.

Commenting, Jean Claude Gandur, President and Chief Executive Officer of Addax Petroleum said: "We are pleased to expand our exploration portfolio in Gabon, a region we know well and consider to be highly prospective. As the new operator of the license area, Addax Petroleum will plan to commence the drilling of our first exploration well on the Charlie prospect during the early part of the third quarter of this year."

Under the terms of the acquisition, Addax Petroleum will reimburse Sterling US$3.3 million for past costs and will carry 18 per cent of Sterling's costs associated with their remaining 32 per cent working interest in the upcoming exploration well and, subject to a cost cap, a second well.

The Iris Marin license area covers a shallow water exploration permit of approximately 99,600 gross acres (403 km2) of the southern Gabon basin and is adjacent to the producing, Shell-operated Gamba field.

About Addax Petroleum

Addax Petroleum is an international oil and gas exploration and production company with a strategic focus on West Africa and the Middle East. Addax Petroleum is one of the largest independent oil producers in West Africa and has increased its crude oil production from an average of 8,800 bbl/d for 1998 to an average of approximately 139,100 bbl/d for the first quarter of 2008. Further information about Addax Petroleum is available at http://www.sedar.com, http://www.londonstockexchange.com or the Corporation's website, http://www.addaxpetroleum.com.

Legal Notice - Forward-Looking Statements

Certain statements in this news release constitute forward-looking statements under applicable securities legislation. Such statements are generally identifiable by the terminology used, such as "anticipate", "believe", "intend", "expect", "plan", "estimate", "budget", "outlook", "may", "will", "should", "could" , "would" or other similar wording. Forward-looking information in this news release includes, but is not limited to, change in operatorship of the subject license area, reference to business strategy and goals, future capital and other expenditures, including payment and carry terms, drilling plans, the submission of development plans, project development schedules and results, results of exploration activities and dates by which certain areas may be developed or may come on-stream, royalties payable, financing and capital activities and government approvals. By its very nature, such forward-looking information requires Addax Petroleum to make assumptions that may not materialize or that may not be accurate. This forward-looking information is subject to known and unknown risks and uncertainties and other factors, which may cause actual results, levels of activity and achievements to differ materially from those expressed or implied by such information. Such factors include, but are not limited to: risk of partial partner pre-emption, prices of oil and natural gas, including price fluctuations; general economic, market and business conditions; industry capacity; competitive action by other companies; refining and marketing margins; the ability to produce and transport crude oil and natural gas to markets; the effects of weather and climate conditions; the results of exploration and development drilling and related activities; fluctuation in interest rates and foreign currency exchange rates; the ability of suppliers to meet commitments; actions by governmental authorities, including increases in taxes; decisions or approvals of administrative tribunals; changes in environmental and other regulations; risks attendant with oil and gas operations, both domestic and international; international political events; expected rates of return; and other factors, many of which are beyond the control of Addax Petroleum. More specifically, production may be affected by such factors as exploration success, start-up timing and success, facility reliability, reservoir performance and natural decline rates, water handling, and drilling progress. Capital expenditures may be affected by cost pressures associated with new capital projects, including labour and material supply, project management and drilling rig rates and availability. These factors are discussed in greater detail in filings made by Addax Petroleum with the Canadian provincial securities commissions.

Readers are cautioned that the foregoing list of important factors affecting forward-looking information is not exhaustive. Furthermore, the forward-looking information contained in this press release is made as of the date of this press release and, except as required by applicable law, Addax Petroleum does not undertake any obligation to update publicly or to revise any of the included forward-looking information, whether as a result of new information, future events or otherwise. The forward-looking information contained in this press release is expressly qualified by this cautionary statement.

For further information: Mr. Patrick Spollen, Investor Relations, Tel.: +41(0)22-702-95-47, patrick.spollen@addaxpetroleum.com; Mr. Craig Kelly, Investor Relations, Tel.: +41(0)22-702-95-68, craig.kelly@addaxpetroleum.com; Ms. Marie-Gabrielle Cajoly, Press Relations, Tel.: +41(0)22-702-94-44, marie-gabrielle.cajoly@addaxpetroleum.com; Mr. Nick Cowling, Press Relations, Tel.: +1-416-934-8011, nick.cowling@cossette.com; Mr. James Henderson, Press Relations, Tel.: +44(0)20-7743-6673, james.henderson@pelhampr.com; Mr. Alisdair Haythornthwaite, Press Relations, Tel.: +44(0)20-7743-6676, alisdair.haythornthwaite@pelhampr.com

For further information: Mr. Patrick Spollen, Investor Relations, Tel.: +41(0)22-702-95-47, patrick.spollen@addaxpetroleum.com; Mr. Craig Kelly, Investor Relations, Tel.: +41(0)22-702-95-68, craig.kelly@addaxpetroleum.com; Ms. Marie-Gabrielle Cajoly, Press Relations, Tel.: +41(0)22-702-94-44, marie-gabrielle.cajoly@addaxpetroleum.com; Mr. Nick Cowling, Press Relations, Tel.: +1-416-934-8011, nick.cowling@cossette.com; Mr. James Henderson, Press Relations, Tel.: +44(0)20-7743-6673, james.henderson@pelhampr.com; Mr. Alisdair Haythornthwaite, Press Relations, Tel.: +44(0)20-7743-6676, alisdair.haythornthwaite@pelhampr.com