Mitsui & Co Ltd: Mitsui approved investment for Robe River J/V Port Expansion in Western Australia

  Mitsui & Co Ltd: Mitsui approved investment for Robe River J/V Port
  Expansion in Western Australia

UK Regulatory Announcement

LONDON

This announcement is for our U.S. $5,000,000,000 Euro Medium Term Note
Programme authorised by UKLA on 3rd September 2012.

September 25, 2012

Mitsui & Co., Ltd.

Mitsui & Co., Ltd. (“Mitsui”) (Head Office: Tokyo, Japan, President and CEO:
Masami Iijima), approved the investment to expand the iron ore export capacity
at Cape Lambert by 70 million tons per year and the replacement of existing
port facilities (“Port Expansion”), owned by the Robe River J/V (Rio Tinto
53%, Mitsui 33%, Nippon Steel Corporation 10.5%, Sumitomo Metals Industries,
Ltd. 3.5%) in the Pilbara region of Western Australia.

Cape Lambert is currently under construction to increase its nameplate
capacity from 80 million tons to 133 million tons per year and the approved
Port Expansion will further increase its nameplate capacity to 203 million
tons per year, the first ore shipment to be scheduled in the first half of
calendar year 2015.

Mitsui will invest A$ 1.5 billion (approximately 124.0 billion yen) for the
Port Expansion through its 100% subsidiary Mitsui Iron Ore Development Pty.
Ltd. The Expansion Project is subject to Robe River J/V partner approval.

Mitsui will work to increase the iron ore supply through the Robe River J/V in
response to the expected increase in global demand over the medium to long
term.

For further information, please contact:
Mitsui & Co., Ltd.
Investor Relations Division         Tel: +81-3-3285-7910
Corporate Communications Division   Tel: +81-3-3285-7562

Notice:

This announcement contains forward-looking statements. These forward-looking
statements are based on Mitsui’s current assumptions, expectations and beliefs
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, financial position or cash
flows to be materially different from any future results, financial position
or cash flows expressed or implied by these forward-looking statements. These
risks, uncertainties and other factors referred to above include, but are not
limited to, those contained in Mitsui's latest Annual Securities Report and
Quarterly Securities Report, and Mitsui undertakes no obligation to publicly
update or revise any forward-looking statements.

This announcement 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.

For diagrams omitted, please see our home page.
(http://www.mitsui.com/jp/en/release/2012/1199129_3607.html)

Contact:

Mitsui & Co Ltd