PRESS RELEASE 6th June 2005 EQUATORIAL GUINEA SELLS PARTIAL INTEREST IN EQUATORIAL GUINEA LIQUEFIED NATURAL GAS PROJECT Malabo, 6th June, 2005 – The Ministry of Mines, Industry and Energy, representing the Government of Equatorial Guinea, announced today that agreements have been entered into under which GEPetrol, the National Oil Company of Equatorial Guinea will sell to each of Mitsui & Co., Ltd. (Mitsui) and a subsidiary of Marubeni Corporation (Marubeni), a 6.5 percent interest in the Equatorial Guinea Liquefied Natural Gas (LNG) project. Marathon will also sell a 2% interest to Mitsui. After the sale, the interests in the project will become: GEPetrol 25% Marathon 60% Mitsui 8.5% Marubeni 6.5% The thirteen percent interest in the project that GEPetrol is selling is being obtained from Marathon by GEPetrol’s exercise of a purchase right as a shareholder in the LNG project company. Under the terms of this purchase by GEPetrol, Marathon will be reimbursed for its actual costs incurred up to the date of closing, plus an additional specified rate of return. Under the terms of the sales to Mitsui and Marubeni, GEPetrol will be reimbursed for the cost of purchasing the thirteen percent interest from Marathon and GEPetrol will additionally receive a premium and future consideration based upon the performance of the LNG project. This is the first material investment by Japanese companies in Equatorial Guinea and was made only after thorough due diligence investigations. Commenting on today’s announcement, Atanasio Ela Ntugu Nsa, Equatorial Guinea’s Minister of Mines, Industry and Energy, said, “The Government of Equatorial Guinea welcomes Mitsui and Marubeni to our country and the partnership that is developing the Equatorial Guinea LNG project. We believe our expanded partnership is an important sign of the international businesscommunity’s confidence in our LNG Project, our economy and the substantial investment potential that exists in Equatorial Guinea. This project is enabling us to more fully develop our abundant natural resources while providing long-term economic, social and environmental benefits to the people of Equatorial Guinea. We look forward to working with our new partners as we seek ways to achieve continued economic growth.”