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               03 September 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      46,755,290       4.68%      534,672      0.05%
securities
(2) Derivatives      511,879       0.05%    2,000,738      0.20%
(other than
options)
(3) Options and      101,200       0.01%      101,400      0.01%
agreements to
purchase/sell
Total             47,368,369       4.75%    2,636,810      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                 2,743                    46.0500
Purchase                 7,556                    46.7686
Purchase                 10,100                   47.1128
Purchase                 4,303                    46.0500
Purchase                 3,505                    46.4759
Purchase                 2,300                    47.3936
Purchase                 37,957                   46.2558
Purchase                 36,000                   47.0910
Purchase                 41,690                   46.5407
Purchase                 1,200                    47.0200
Purchase                 1,000                    47.0200
Purchase                 4,483                    46.0500
Purchase                 2,898                    46.8743
Purchase                 80                       57.2500 EUR
Purchase                 145                      49.9600
Sale                     86                       46.7848
Sale                     9,542                    46.1952
Sale                     2,227                    47.1967
Sale                     6,403                    46.8910
Sale                     500                      47.2120
Sale                     4,303                    47.5003
Sale                     43                       47.0775
Sale                     1,250                    46.9500
Sale                     44                       46.4496
Sale                     28,744                   46.9249
Sale                     24                       48.6845
Sale                     1,358                    46.4552
Sale                     453                      46.4552
Sale                     266                      46.4552
Sale                     450                      47.0494
Sale                     145                      47.2394
Sale                     65,000                   47.9775
Sale                     207                      46.4552
Sale                     47,330                   46.9243
Sale                     30                       47.6160
Sale                     43                       48.0845
Sale                     1,249                    47.1738
Sale                     2,519                    46.7669
Sale                     2,000                    46.1834
Sale                     37                       46.9545
Sale                     245                      46.9094

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          2000          46.1834
CFD            Long          9542          46.1951
CFD            Long          6403          46.8909
CFD            Long          4292          46.8949
CFD            Long          47330         46.9242
CFD            Long          28744         46.9249
CFD            Long          11734         47.1264
CFD            Long          1249          47.1737
CFD            Long          2227          47.1967
CFD            Short         37957         46.2557
CFD            Short         3505          46.4759
CFD            Short         41690         46.5407
CFD            Short         7556          46.7685
CFD            Short         2898          46.8742
CFD            Short         36000         47.091
CFD            Short         10100         47.1128
CFD            Short         2300          47.3935

(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                         04 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   100,000                56.0000          AMER           18/12/2009
Option            Purchased   -100,000               64.0000          AMER           21/11/2008
Option            Purchased   350                    5,000.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   150                    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   -150                   7,000.0000       EURO           19/12/2008
Option            Purchased   -270                   6,400.0000       EURO           19/12/2008
Option            Purchased   -350                   7,000.0000       EURO           19/12/2008
Option            Purchased   -350                   5,000.0000       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