RIO TINTO LIMITED — M&A Activity 2011

RIVERSDALE MINING

31 January 2011

Company Announcements Office Australian Stock Exchange Level 4, Exchange Centre 20 Bridge Street Sydney NSW 2000

Dear Sir / Madam.

Completion of Dispatch of Target's Statement

Riversdale Mining Limited (Riversdale) has completed the dispatch of its Target's Statement in relation to the takeover offer by Rio Tinto Jersey Holdings 2010 Limited (Rio Tinto) for all of the ordinary shares in Riversdale.

The Target's Statement was dispatched to those people who held ordinary shares in Riversdale at 7:00pm (Sydney time) on 5 January 2011, being the date set by Rio Tinto under section 633(2) of the Corporations Act 2001 (Cth) for determining who will receive Rio Tinto's Bidder's Statement and the Target's Statement.

Yours faithfully,

Neall F Leredan

Niall Lenahan Company Secretary

For further shareholder information please contact:

Riversdale Information Line

1300 039 427 (within Australia) +61 3 9415 4199 (outside Australia)

At any time between 9:00am and 5:00pm (Sydney time) on Monday to Friday.

Riversdale Mining Limited ABN 53 006 031 161 Mail GPO Box 5371. Sydney NSW 2001 Phone +61 2 8299 7900 Fax +61 2 8299 7999 Email [email protected] Web www.riversdalemining.com.au