Rule 8.3 - RIO TINTO PLC

FORM 8.3

    DEALINGS BY PERSONS WITH INTERESTS IN SECURITIES REPRESENTING 1% OR MORE
              (Rule 8.3 of the City Code on Takeovers and Mergers)


1.   KEY INFORMATION

Name of person dealing        BARCLAYS PLC
(Note 1)
Company dealt in              RIO TINTO
Class of relevant security    ORD GBP0.10
to which the dealings being
disclosed relate (Note 2)
Date of dealing               22 August 2008

2.   INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE

(a)  Interests and short positions (following dealing) in the class of relevant
security dealt in (Note 3)

                            Long                     Short

                      Number       (%)         Number       (%)

(1) Relevant      46,239,866       4.63%      856,714      0.09%
securities
(2) Derivatives      596,864       0.06%    1,793,735      0.18%
(other than
options)
(3) Options and      101,400       0.01%      101,650      0.01%
agreements to
purchase/sell
Total             46,938,130       4.70%    2,752,099      0.28%


(b)  Interests and short positions in relevant securities of the company, other
     than the class dealt in (Note 3)

Class of                    Long                     Short
relevant
security:

                  Number              (%)   Number              (%)

(1) Relevant
securities

(2) Derivatives
(other than
options)

(3) Options and
agreements to
purchase/sell

Total


  (c)  Rights to subscribe (Note 3)

Class of relevant security:   Details



3.   DEALINGS (Note 4)

  (a)  Purchases and sales

Purchase/sale    Number of Securities  Price per unit
                                       (GBP)
Purchase         3,909                 50.9996
Purchase         8,069                 51.1355
Purchase         26,486                51.4931
Purchase         18,808                51.4460
Purchase         686                   51.5274
Purchase         1,002                 51.0800
Purchase         527                   Transfer
Purchase         39,338                51.3835
Purchase         2,717                 51.5817
Purchase         4,382                 51.0131
Purchase         3,098                 51.2112
Purchase         3,000                 51.5259
Purchase         1,428                 51.7900
Purchase         5,645                 51.7900
Purchase         1,337                 51.7900
Purchase         1,908                 51.7900
Purchase         30                    51.4570
Purchase         140                   51.6586
Purchase         6,900                 51.6329
Sale             59                    50.8045
Sale             40                    50.7000
Sale             85,533                51.2474
Sale             3,775                 50.6405
Sale             56                    50.7345
Sale             17                    51.6545
Sale             530                   51.2014
Sale             14,300                51.3149
Sale             58                    Transfer
Sale             193                   51.6000
Sale             125                   51.2624
Sale             1,413                 51.7900
Sale             554                   51.6061
Sale             43,923                49.8600
Sale             120                   51.1415
Sale             55                    51.6460
Sale             163                   51.2100
Sale             527                   Transfer
Sale             21,546                51.7900
Sale             18,654                51.0965
Sale             400                   51.8717
Sale             3,909                 51.7900
Sale             20                    51.5575
Sale             37                    51.6745
Sale             9,236                 51.1691
Sale             14                    51.6745
Sale             3,981                 51.7900

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          9236          51.1691
CFD            Long          530           51.2013
CFD            Long          85533         51.2474
CFD            Long          14300         51.3149
CFD            Long          763           51.4523
CFD            Long          400           51.8717
CFD            Short         4382          51.013
CFD            Short         3098          51.2112
CFD            Short         39338         51.3834
CFD            Short         18808         51.4459
CFD            Short         5657          51.4612
CFD            Short         26486         51.4931
CFD            Short         3000          51.5259
CFD            Short         6900          51.6328
CFD            Short         591           51.8602

(c)  Options transactions in respect of existing securities

(i)  Writing, selling, purchasing or varying

Product name,   Writing,          Number of          Exercise  Type, e.g.      Expiry      Option money
e.g. call       selling,          securities to      price     American,       date        paid/received
option          purchasing,       which the option             European etc.               per unit (GBP)
                varying etc.      relates (GBP)


(ii) Exercising

Product name, e.g.  Number of           Exercise price per
call option         securities          unit (Note 5)




(d)  Other dealings (including new securities) (Note 4)


Nature of transaction Details           Price per unit
(Note 8)                                (if applicable)
                                        (Note 5)




4.   OTHER INFORMATION
None

Agreements, arrangements or understandings relating to options or derivatives


Full details of any agreement, arrangement or understanding between the
person disclosing and any other person relating to the voting rights of
any relevant securities under any option referred to on this form or
relating to the voting rights or future acquisition or disposal of any
relevant securities to which any derivative referred to on this form is
referenced.  If none, this should be stated.




Is a Supplemental Form 8 attached? (Note 9)                 YES


Date of disclosure                         26 August 2008
Contact name                               Geoff Smith
Telephone number                           020 7116 2913
If a connected EFM, name of
offeree/offeror with which connected
If a connected EFM, state nature of
connection (Note 10)


Notes

The Notes on Form 8.3 can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk

SUPPLEMENTAL FORM 8

DETAILS OF OPEN POSITIONS
(This form should be attached to Form 8.1, Form 8.1(b)(ii) or Form 8.3, as appropriate)

OPEN POSITIONS (Note 1)
Product name,     Written or  Number of securities   Exercise price   Type, e.g.     Expiry date
e.g. call option  purchased   to which the option    (Note 2)         American,
                              or derivative relates                   European etc.
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   300                    5,000.0000       EURO           19/12/2008
Option            Purchased   200                    5,000.0000       EURO           19/09/2008
Option            Purchased   200                    5,000.0000       EURO           19/12/2008
Option            Purchased   -135                   5,200.0000       EURO           19/12/2008
Option            Purchased   -145                   5,200.0000       EURO           19/12/2008
Option            Purchased   -200                   7,000.0000       EURO           19/12/2008
Option            Purchased   -250                   5,200.0000       EURO           19/09/2008
Option            Purchased   -270                   6,400.0000       EURO           19/12/2008
Option            Purchased   -300                   7,000.0000       EURO           19/12/2008
Option            Purchased   -350                   5,000.0000       EURO           19/12/2008
Option            Purchased   100,000                56.0000          AMER           18/12/2009
Option            Purchased   -100,000               64.0000          AMER           21/11/2008



Notes

1. Where there are open option positions or open derivative positions (except for CFDs), full details should be given.
Full details of any  existing agreements to purchase or to sell  should also be given on this form.

2. For all prices and other monetary amounts, the currency must be stated.

For details of the Code's dealing disclosure requirements, see Rule 8 and its Notes which can be viewed on the Takeover
Panel's website at www.thetakeoverpanel.org.uk