Mitsui & Co., Ltd.
Future Net Remaining Reserves
Attributable to Certain Interests In
Australia, New Zealand and Indonesia
December 31, 2009
RYDER SCOTT COMPANY, L.P.
TBPE Firm Registration No. F-1580
/s/ Herman G. Acuña
/s/ Harris Ghozali
Herman G. Acuña, P.E.
Harris Ghozali, P.E.
Texas P.E. License No. 92254
Texas P.E. License No. 97664
Managing Senior Vice President—International
Senior Vice President—International
June 28, 2010
Mitsui & Co., Ltd.
2-1, Ohtemachi 1-chome,
Chiyoda-ku, Tokyo 100-0004
At the request of Mitsui & Co., Ltd. and its affiliated companies, Japan Australia LNG (MIMI) Pty. Ltd., Mitsui E&P
Australia Pty Limited, KG Berau Petroleum Ltd. and KG Wiriagar Petroleum Ltd., (hereinafter collectively called “MITSUI”),
Ryder Scott Company has prepared an estimate of the proved reserves, future production and income attributable to certain
properties of MITSUI, as of December 31, 2009. The subject properties are located in the countries of Australia, New Zealand
The reserves and income data were estimated based on the definitions and disclosure guidelines contained in the United
States Securities and Exchange Commission Title 17, Code of Federal Regulations, Modernization of Oil and Gas Reporting,
Final Rule released January 14, 2009 in the Federal Register (SEC regulations). The conclusions of our third party study,
completed on June 24, 2010, are discussed herein.
The conclusions discussed in this report, as of December 31, 2009, are related to hydrocarbon prices. The hydrocarbon
prices used in the preparation of this report are based on the average prices during the 12-month period prior to the ending date
of the period covered in this report, determined as unweighted arithmetic averages of the prices in effect on the first-day-of-the-
month for each month within such period, unless prices were defined by contractual arra