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               29 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      46,661,061       4.68%      640,366      0.06%
securities
(2) Derivatives      611,162       0.06%    1,868,526      0.19%
(other than
options)
(3) Options and      101,200       0.01%      101,400      0.01%
agreements to
purchase/sell
Total             47,373,423       4.75%    2,610,292      0.26%


(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         16                    52.2827
Purchase         2,320                 52.2900
Purchase         23                    52.7949
Purchase         1,024                 52.2900
Purchase         131                   52.2827
Purchase         270,000               52.4000
Purchase         4,860                 52.2900
Purchase         136                   52.7949
Purchase         2                     52.7949
Purchase         355                   52.2827
Purchase         9,462                 52.2900
Purchase         1,400                 52.2900
Purchase         234                   52.7949
Purchase         10,384                52.2900
Purchase         1,331                 52.2827
Purchase         1,585                 52.2900
Purchase         106                   52.2900
Purchase         482                   52.2984
Purchase         2,000                 53.2811
Purchase         20,000                53.4000
Purchase         2,132                 53.3570
Purchase         20,996                52.3700
Purchase         5,500                 52.8836
Purchase         300                   52.9900
Purchase         776                   52.2827
Purchase         52,128                53.1979
Purchase         117                   52.2900
Purchase         20,996                52.3700
Purchase         31,170                52.2425
Purchase         9,000                 52.2315
Purchase         9,500                 52.6245
Purchase         11,855                52.2900
Purchase         62                    52.7949
Purchase         510                   52.6716
Purchase         1,335                 52.2900
Purchase         6,802                 52.3186
Purchase         64,910                52.3186
Purchase         562                   52.2900
Purchase         24,664                52.4050
Purchase         2,666                 52.2900
Purchase         5,359                 52.2900
Purchase         220                   52.2900
Purchase         2,036                 52.2900
Purchase         75,346                52.2900
Purchase         7,364                 52.2900
Purchase         1,435                 52.2827
Purchase         253                   52.7949
Purchase         11,203                52.2900
Purchase         611                   52.2900
Purchase         476                   52.2900
Sale             2,045                 Transfer
Sale             481                   52.7494
Sale             270,000               52.4000
Sale             350                   52.4200
Sale             6,000                 52.2900
Sale             863                   Transfer
Sale             75                    52.6440
Sale             240                   53.3375
Sale             75                    53.3036
Sale             5,067                 52.2900
Sale             3,588                 52.2900
Sale             129                   Transfer
Sale             1,335                 52.2900
Sale             7,576                 52.7104
Sale             56                    51.9900
Sale             11,396                52.2900
Sale             47,111                52.3289
Sale             3,589                 52.5125
Sale             24,927                52.3695
Sale             39                    53.2890
Sale             100                   53.2320
Sale             630                   52.2900
Sale             377                   52.2900
Sale             2,113                 52.2900
Sale             11,855                52.2900
Sale             174                   52.2900
Sale             218                   52.2900
Sale             150                   52.1660
Sale             21,393                52.2973
Sale             3,775                 52.6576
Sale             314                   52.9300
Sale             75,346                52.2900
Sale             5,511                 52.3677
Sale             7,364                 52.2900
Sale             300                   52.9900
Sale             65                    53.2155
Sale             22,728                52.2900
Sale             6,386                 52.2900
Sale             50                    52.9716
Sale             671                   Transfer
Sale             230                   Transfer
Sale             2,398                 53.2204
Sale             6,064                 52.2900

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          701           52.29
CFD            Long          47111         52.3289
CFD            Long          5511          52.3676
CFD            Long          24927         52.3695
CFD            Long          3589          52.5124
CFD            Long          481           52.7493
CFD            Long          300           52.99
CFD            Long          2398          53.2203
CFD            Short         9000          52.2314
CFD            Short         31170         52.2424
CFD            Short         2124          52.2744
CFD            Short         482           52.2983
CFD            Short         9500          52.6245
CFD            Short         510           52.6716
CFD            Short         5500          52.8836
CFD            Short         300           52.99
CFD            Short         52128         53.1979
CFD            Short         2132          53.3569

(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                         01 September 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