Rule 2.10 Announcement

Rio Tinto PLC
07 April 2008

Disclosure in accordance with Rule 2.10 of the City Code

7 April 2008

In accordance with Rule 2.10 of The City Code on Takeovers and Mergers (the '
City Code'), Rio Tinto plc and Rio Tinto Limited confirm that as at the close of
business on 7 April 2008 they had the following securities in issue:

Rio Tinto plc:                 997,843,264 Ordinary shares of 10 pence each.
                               ISIN GB0007188757*
                               1 DLC dividend share of 10 pence
                               1 special voting share of 10 pence

Rio Tinto Limited:             **456,815,943 Ordinary shares ISIN AU000000RIO1
                               1 DLC dividend share
                               1 special voting share


*The ISIN for the ordinary shares represented by the Rio Tinto plc American
Depository Receipts is US7672041008.  Each Rio Tinto plc American Depository
Receipt represents four ordinary shares of Rio Tinto plc.

**Rio Tinto plc, through Tinto Holdings Australia Pty Limited, holds 171,072,520
ordinary issued shares in Rio Tinto Limited, representing 37.45% of Rio Tinto
Limited's shares in issue.  The balance of 285,743,423 ordinary shares are
publicly held.

In 1995, Rio Tinto shareholders approved the terms of the dual listed companies
('DLC') merger which was designed to place the shareholders of both companies in
substantially the same position as if they held shares in a single enterprise
owning all the assets of both Companies.  The DLC dividend shares and the
special voting shares issued by Rio Tinto plc and Rio Tinto Limited carry rights
to facilitate the operation of the DLC structure.  For more information on Rio
Tinto's DLC structure and the rights attaching to the DLC Dividend shares and
the special voting shares, please see Rio Tinto's 2006 Annual report and
financial statements.

About Rio Tinto

Rio Tinto is a leading international mining group headquartered in the UK,
combining Rio Tinto plc, a London listed company, and Rio Tinto Limited, which
is listed on the Australian Securities Exchange.

Rio Tinto's business is finding, mining, and processing mineral resources. Major
products are aluminium, copper, diamonds, energy (coal and uranium), gold,
industrial minerals (borax, titanium dioxide, salt, talc) and iron ore.
Activities span the world but are strongly represented in Australia and North
America with significant businesses in South America, Asia, Europe and southern
Africa. For further information, please contact:


Media Relations, London                            Media Relations, Australia
                                                   Ian Head
Nick Cobban                                        Office:  [phone]
Office:  [phone]                      Mobile: [phone]
Mobile: [phone]

                                                   Amanda Buckley
                                                   Office:  [phone]
                                                   Mobile: [phone]

Investor Relations, London                         Investor Relations, Australia
Nigel Jones                                        Dave Skinner
Office: [phone]                       Office:  [phone]
Mobile: [phone]                       Mobile: [phone]

David Ovington                                     Investor Relations, North America
Office:  [phone]                      Jason Combes
Mobile: [phone]                       Office:  [phone]
                                                   Mobile: [phone]
Email: [e-mail]

Website: www.riotinto.com
High resolution photographs available at: www.newscast.co.uk


Dealing Disclosure Requirements

Under the provisions of Rule 8.3 of the Takeover Code (the 'Code'), if any
person is, or becomes, 'interested' (directly or indirectly) in 1% or more of
any class of 'relevant securities' of any of Rio Tinto plc, Rio Tinto Limited,
BHP Billiton Plc or BHP Billiton Limited, all 'dealings' in any 'relevant
securities' of that company (including by means of an option in respect of, or a
derivative referenced to, any such 'relevant securities') must be publicly
disclosed by no later than 3.30 pm (London time) on the London business day
following the date of the relevant transaction.

The relevant disclosure must also include details of all 'interests' or '
dealings' in any class of 'relevant securities' of the other company which is
part of its DLC structure. Therefore, if, for example, a disclosure is being
made in respect of a dealing in securities of Rio Tinto plc, an accompanying
disclosure must also be made of interests or short positions held in securities
of Rio Tinto Limited, even if the person's interest or short position is less
than 1% of the relevant class. The same approach should be adopted in respect of
securities of BHP Billiton Plc and BHP Billiton Limited.  Therefore, each
disclosure should consist of two Rule 8.3 disclosure forms, one for the plc arm
of the DLC structure and one for the Limited arm of the DLC structure, released
as one announcement.

This requirement will continue until the date on which the offer becomes, or is
declared, unconditional as to acceptances, lapses or is otherwise withdrawn or
on which the 'offer period' otherwise ends. If two or more persons act together
pursuant to an agreement or understanding, whether formal or informal, to
acquire an 'interest' in 'relevant securities' of any of Rio Tinto plc, Rio
Tinto Limited, BHP Billiton Plc or BHP Billiton Limited they will be deemed to
be a single person for the purpose of Rule 8.3.

Under the provisions of Rule 8.1 of the Code, all 'dealings' in 'relevant
securities' of either Rio Tinto or BHP Billiton by either Rio Tinto or BHP
Billiton, or by any of their respective 'associates', must be disclosed by no
later than 12:00 noon (London time) on the London business day following the
date of the relevant transaction.

A disclosure table, giving details of the companies in whose 'relevant
securities' 'dealings' should be disclosed, and the number of such securities in
issue, can be found on the Takeover Panel's website at
www.thetakeoverpanel.org.uk.

'Interests in securities' arise, in summary, when a person has long economic
exposure, whether conditional or absolute, to changes in the price of
securities. In particular, a person will be treated as having an 'interest' by
virtue of the ownership or control of securities, or by virtue of any option in
respect of, or derivative referenced to, securities.

Terms in quotation marks are defined in the Code, which can also be found on the
Panel's website. If you are in any doubt as to whether or not you are required
to disclose a 'dealing' under Rule 8, you should consult the Panel.




                      This information is provided by RNS
            The company news service from the London Stock Exchange