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               01 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      46,573,468       4.67%    1,073,877      0.11%
securities
(2) Derivatives      848,468       0.09%    1,709,823      0.17%
(other than
options)
(3) Options and      101,200       0.01%      101,300      0.01%
agreements to
purchase/sell
Total             47,523,336       4.76%    2,885,000      0.29%


(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
Purchase         77,541                51.2948
Purchase         12                    50.3875
Purchase         10,000                51.2314
Purchase         45,712                51.6923
Purchase         20,996                51.1700
Purchase         34,433                51.7200
Purchase         50,955                51.2307
Purchase         952                   50.2524
Purchase         41,991                51.1700
Purchase         10,497                51.1700
Purchase         200                   51.0750
Purchase         2,114                 50.7390
Purchase         73,485                51.1700
Purchase         70,600                53.4000
Purchase         1,526                 50.5001
Purchase         15,000                50.5618
Purchase         5,900                 51.1700
Purchase         839                   50.4700
Purchase         8,524                 50.4700
Purchase         3,303                 50.4700
Sale             1,935                 50.7423
Sale             300                   51.6415
Sale             8,281                 50.7499
Sale             622                   50.7423
Sale             4,901                 51.0809
Sale             73,485                51.1700
Sale             882                   50.7423
Sale             400                   50.3720
Sale             101                   51.0121
Sale             77,541                51.2948
Sale             31,730                50.8508
Sale             3,357                 51.0809
Sale             4,285                 51.0809
Sale             8,200                 51.5818
Sale             5,804                 51.0809
Sale             2,493                 51.0809
Sale             8,506                 51.0809
Sale             5,506                 51.0809
Sale             100                   51.0326
Sale             754                   51.7800
Sale             6,688                 50.4700
Sale             214                   50.7423
Sale             132                   51.0025
Sale             318                   50.7423
Sale             353                   50.7423
Sale             100                   51.2505
Sale             26,445                50.2639
Sale             4,311                 51.0813
Sale             88,578                50.9358
Sale             14,187                51.0809
Sale             8,696                 50.9493
Sale             4,779                 51.0018
Sale             200                   51.0750
Sale             1,022                 50.7423
Sale             21,276                50.9298
Sale             2,704                 51.0809
Sale             1,068                 51.0809
Sale             200                   50.4700

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          26445         50.2638
CFD            Long          400           50.3719
CFD            Long          3142          50.4801
CFD            Long          31730         50.8507
CFD            Long          21276         50.9297
CFD            Long          88578         50.9357
CFD            Long          8696          50.9492
CFD            Long          4779          51.0017
CFD            Long          200           51.075
CFD            Long          420           51.1694
CFD            Long          77541         51.2947
CFD            Long          8200          51.5818
CFD            Long          300           51.6415
CFD            Short         952           50.2524
CFD            Short         12            50.3875
CFD            Short         15000         50.5618
CFD            Short         2114          50.739
CFD            Short         1308          51.0061
CFD            Short         200           51.075
CFD            Short         50955         51.2307
CFD            Short         77541         51.2947
CFD            Short         45712         51.6922

(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)
Put             Purchase           200                50        EURO          19/09/2008      2.00

(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 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)


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   500                    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   200                    5,000.0000       EURO           19/09/2008
Option            Purchased   -135                   5,200.0000       EURO           19/12/2008
Option            Purchased   -145                   5,200.0000       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   -500                   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