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               15 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      46,164,134       4.63%      829,925      0.08%
securities
(2) Derivatives      459,206       0.05%    1,779,441      0.18%
(other than
options)
(3) Options and      101,400      0.01%       101,300      0.01%
agreements to
purchase/sell
Total             46,724,740      4.68%     2,710,666      0.27%


(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         8,632                 46.7175
Purchase         6,000                 46.0500
Purchase         400                   46.6277
Purchase         7,848                 46.0569
Purchase         300                   47.1900
Purchase         27,132                47.3728
Purchase         2,000                 Transfer
Purchase         116                   46.0500
Purchase         50                    46.9756
Purchase         150                   46.5800
Purchase         5,665                 46.0500
Purchase         115                   46.0500
Purchase         17,987                46.0500
Purchase         185                   46.7344
Purchase         527                   Transfer
Sale             3,441                 47.0354
Sale             30                    48.9242
Sale             33                    48.8484
Sale             561                   46.0500
Sale             3,244                 47.2629
Sale             17,454                47.2125
Sale             413                   47.3029
Sale             100,000               46.7649
Sale             94,766                46.9141
Sale             1,600                 Transfer
Sale             24,400                46.8625
Sale             579                   46.4515
Sale             740                   46.3516
Sale             90                    47.4745
Sale             105                   48.2384
Sale             47                    47.3530
Sale             15,048                46.0500
Sale             8,360                 46.0500
Sale             130                   46.3624
Sale             18,103                46.0500
Sale             3,798                 46.0500
Sale             100                   47.1500
Sale             32,315                46.5675
Sale             110                   46.3830
Sale             44                    46.0500
Sale             391                   46.0500
Sale             60                    47.4175
Sale             31                    48.6263
Sale             13,600                46.6554
Sale             10,032                46.0500
Sale             7                     47.2045
Sale             39                    46.3545

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          579           46.4515
CFD            Long          32315         46.5674
CFD            Long          13600         46.6553
CFD            Long          24400         46.8625
CFD            Long          94766         46.9141
CFD            Long          17454         47.2124
CFD            Long          3244          47.2629
CFD            Long          413           47.3029
CFD            Short         7848          46.0569
CFD            Short         400           46.6277
CFD            Short         23081         46.6974
CFD            Short         8632          46.7175
CFD            Short         300           47.19
CFD            Short         27132         47.3728

(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                         18 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   100,000                 56.0000         AMER           18/12/2009
Option            Purchased   -100,000                64.0000         AMER           21/11/2008
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



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