March 27, 2012

News Release

Sumitomo Metal Mining Co., Ltd.

Sumitomo Corporation

New Ore Deposit Identified in Pogo Gold Mine, Alaska, USA

Sumitomo Metal Mining Co., Ltd. (“SMM”, Headquarters: Minato-ku, Tokyo,

President and Representative Director: Nobumasa Kemori) is pleased to announce that

a new gold deposit has been identified during a recent exploration carried out with the

aim of acquiring additional deposits in the Pogo gold mine (Alaska, USA), which is

owned by SMM and Sumitomo Corporation (Headquarters: Chuo-ku Tokyo, President

and CEO: Susumu Kato) (Investment ratio: SMM 85% Sumitomo Corporation 15%).

The new deposit (named the “East Deep” deposit) is located northeast of the main Liese

deposit and contains approximately 1.283 million ounces (40 tonnes) of gold based on

the latest resource and reserve estimates for the Pogo mine (as of December 31st of

2011).

As a result of intensive exploration both surface and underground of the Pogo gold

mine after the commencement of production in 2006, the East Deep deposit (E1

orebody) was identified 1,000 feet (300m) northeast of the Liese gold deposit, which is

the main deposit currently subject to mining activities.

The latest resource and reserve estimates including the East Deep deposit as of

December 31st of 2011 show that the total resources and reserves of the Pogo gold mine

is 13.594 million short tons (12.332 million tonnes) with an average gold grade of 0.366

ounces per short ton (12.5 g/t) and a gold content of 4.973 million ounces (155 tonnes).

The development of new access drives to the E1 orebody is to be commenced this year

to accelerate the start of production at the East Deep deposit. In addition, drilling

program will be continued in 2012 to explore the extension of the East Deep deposit as it

is still open in the northeast, north, and west directions at this stage and holds the

potential for further additional ore.

With regard to the scale of production, the Pogo gold mine will maintain annual

current production level of 10 to 11 tonnes (planned production volume for 2011: 10.1

tonnes).

Address inquiries concerning this News Release to:

Sumitomo Metal Mining Co., Ltd.

Masashi Takahashi, Public Relations & Investor Relations Dept.

Tel: 03-3436-7705

Fax: 03-3434-2215

Sumitomo Corporation

Corporate Communications Department

Koji Furui

Tel: 03-5166-3100

Fax: 03-5166-6203

（Appendix）

1. Location of Pogo gold mine

POGODelta Junction

Anchorage

Fairbanks

北極圏

0 600km

3

POGODelta Junction

Anchorage

Fairbanks

北極圏

0 600km0 600km

3

2. Location map of Liese and East Deep deposits

Pogo Ck

Liese Ck

Rin

ger C

k

North C

k

1806000

1806000

1807000

1807000

1808000

1808000

1809000

1809000

1810000

1810000

1811000

1811000

1812000

1812000

1813000

1813000

1814000

1814000

1815000

1815000

1816000

1816000

1817000

1817000

1818000

1818000

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0 1,000 2,000 3,000 4,000500Feet

Liese deposit

East Deep deposit