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               06 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      46,161,383      4.63%       929,368      0.09%
securities
(2) Derivatives      634,648      0.06%     1,719,532      0.17%
(other than
options)
(3) Options and      101,200      0.01%         1,030      0.00%
agreements to
purchase/sell
Total             46,897,431      4.70%     2,750,200      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         41,992                49.0500
Purchase         103                   48.6500
Purchase         1,370                 48.7173
Purchase         1,482                 48.8753
Purchase         32,000                48.3396
Purchase         99,071                48.9226
Purchase         107,000               48.6005
Purchase         5,000                 47.5000
Purchase         100                   48.6700
Purchase         24,010                48.7511
Purchase         37                    48.5980
Purchase         188,963               49.1167
Purchase         20,996                49.1700
Purchase         100,000               48.4029
Purchase         77                    Transfer
Purchase         5,015                 48.8753
Purchase         9,299                 49.0249
Purchase         20,000                48.6578
Purchase         200                   48.7850
Purchase         41,992                49.0500
Purchase         13,200                48.7453
Purchase         2,209                 48.8753
Purchase         241,451               48.6400
Purchase         30                    48.6973
Purchase         200                   47.8850
Purchase         83,983                49.1700
Purchase         300,000               47.5000
Purchase         850                   48.6500
Purchase         850                   48.6500
Purchase         66                    47.5000
Purchase         21                    48.9348
Purchase         2,118                 48.6500
Sale             441                   48.6572
Sale             200                   48.7850
Sale             12,500                48.8561
Sale             4,184                 48.6599
Sale             73,020                48.7293
Sale             190                   48.7021
Sale             36,493                48.7246
Sale             2,200                 48.6491
Sale             2,242                 48.6604
Sale             241,451               48.6400
Sale             529                   48.9300
Sale             188,963               49.1167
Sale             21                    48.6242
Sale             300,000               47.5000
Sale             469                   48.6575
Sale             41                    48.5127
Sale             77                    Transfer
Sale             100                   48.9842
Sale             70,600                48.9450
Sale             100                   48.6063
Sale             85,201                48.6594
Sale             22,381                48.6594
Sale             4,577                 48.6591
Sale             1,483                 48.6605
Sale             433                   48.4988
Sale             2,460                 48.6603
Sale             976,500               Transfer
Sale             1,921                 48.6605
Sale             800                   48.6247
Sale             12,617                48.7036
Sale             70,600                48.9450
Sale             125                   48.7100
Sale             195                   48.8663
Sale             62                    47.7063
Sale             3,265                 48.6602
Sale             36                    47.3842

NB: The below transactions which were previously disclosed have been cancelled
Deal Date  Purchase/Sale Number of Securities Price per unit (GBP)
05/08/2008 Sale          600                  48.7950



(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          433           48.4988
CFD            Long          41            48.5126
CFD            Long          800           48.6247
CFD            Long          2200          48.649
CFD            Long          5586          48.6598
CFD            Long          4409          48.6799
CFD            Long          12617         48.7036
CFD            Long          36493         48.7246
CFD            Long          73020         48.7293
CFD            Long          200           48.785
CFD            Long          12500         48.856
CFD            Short         200           47.885
CFD            Short         32000         48.3395
CFD            Short         100000        48.4029
CFD            Short         37            48.5981
CFD            Short         20000         48.6577
CFD            Short         100           48.67
CFD            Short         30            48.6973
CFD            Short         1370          48.7173
CFD            Short         13200         48.7453
CFD            Short         24010         48.751
CFD            Short         200           48.785
CFD            Short         99071         48.9225
CFD            Short         9299          49.0249

NB: The below transactions which were previously disclosed have been cancelled
Deal Date   Long/Short Number of Securities Price per unit (GBP)
05/08/2008  Long       600                  48.795



(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                         07 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