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Participation in the shale gas projects in Poland
The First Japanese participation in European shale gas projects

Jun. 9, 2011


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Mitsui & Co., Ltd. ("Mitsui") is pleased to announce that it has entered into a definitive agreement with subsidiaries of the U.S. oil and gas development company, Marathon Oil Corporation (NYSE: MRO) ("Marathon"), to acquire a 9% working interest in 10 of Marathon's Paleozoic shale gas exploration concessions in the Republic of Poland ("Poland"). Another partner is a subsidiary of Nexen Inc. ("Nexen"), which owns a 40% working interest of the concessions. The closing of the transaction is subject to the statutory approval by the relevant Polish governmental authorities and Nexen. Mitsui is the first Japanese company to enter into a European shale gas project.

The 10 concessions, encompassing 2.1 million acre are located from north-east to south-east onshore Poland (location map below). Seismic and other geological analysis, as well as drilling of exploration wells to evaluate technical potential of the concessions will be carried out over the next 5 years.

The global demand for natural gas is expected to continue to increase in the future as the need for cleaner energy continues to rise. Although the development of shale gas had been considered uneconomical in the past, due to the recent technological advances and innovation, low-cost development and production have become feasible in recent years. Poland is considered to be one of the most attractive shale gas potential areas in Europe, where the development of shale gas by the major oil and gas companies is expected to accelerate.

We are conducting shale gas development and production activities in the Marcellus Shale, Pennsylvania. With our experience and knowledge acquired from this project, we intend to expand our presence in the European gas market, which follows the US gas market. Additionally, we aim to expand our shale gas business into the U.S., Europe, and other areas around the world, leveraging our global network and the knowledge and know-how regarding shale gas obtained through the Marcellus Shale gas project and this project.

Mitsui has positioned its energy and mineral resources business as a strategically significant business area and will continue to acquire attractive oil and gas assets in order to establish a most robust and well-balanced business portfolio.

About Shale Gas
Shale gas is a natural gas which is contained in a source rock. Traditionally, shale gas is recognized to have abundant amount of reserves in the North American regions. However, the low productivity prevented its commercialization. Nowadays, with the advancement of technologies such as horizontal wells or water fracturing enabled the low-cost production, and the shale gas development is boosting.

Participating interest after Mitsui's participation

Marathon 51.0%(Operator)
Nexen. 40.0%
Mitsui E&P Poland SP. z o.o.
(An affiliate of Mitsui & Co., Ltd)
9.0%

Location of the acquired concessions

Location of the acquired concessions

Notice:
This press release includes forward-looking statements about Mitsui. These forward-looking statements are based on the current assumptions and beliefs of Mitsui in light of the information currently available to it, and involve known and unknown risks, uncertainties and other factors. Such risks, uncertainties and other factors may cause Mitsui's actual results, performance, achievements or financial position to be materially different from any future results, performance, achievements or financial position expressed or implied by these forward-looking statements. The risks, uncertainties and other factors referred to above include, but are not limited to, those contained in Mitsui's latest annual report on Form 20-F, which has been filed with the U.S. Securities and Exchange Commission.
This press release is published in order to publicly announce specific facts stated above, and does not constitute a solicitation of investments or any similar act inside or outside of Japan, regarding the shares, bonds or other securities issued by us.

Information

For inquiries on this matter, please contact

Mitsui & Co., Ltd.
Corporate Communications Division
Kazuhisa Kawamura
Telephone: +81-3-3285-7540
Facsimile: +81-3-3285-9819