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               04 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      46,992,235       4.71%    1,023,748      0.10%
securities
(2) Derivatives      757,510       0.08%    1,761,527      0.18%
(other than
options)
(3) Options and      101,200       0.01%      101,300      0.01%
agreements to
purchase/sell
Total             47,851,145       4.79%    2,886,575      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         41,992                48.9500
Purchase         41,992                50.5800
Purchase         62,336                49.8888
Purchase         83,983                50.4500
Purchase         10,498                48.5200
Purchase         6,594                 48.1484
Purchase         41,992                48.8500
Purchase         15,000                48.0500
Purchase         41,992                50.5800
Purchase         125,975               48.1100
Purchase         10,497                50.0459
Purchase         391                   49.2000
Purchase         1,413                 48.2848
Purchase         60                    48.2778
Purchase         472,400               49.5307
Purchase         41,992                50.4500
Purchase         50                    48.8602
Purchase         3,500                 48.6524
Purchase         600                   48.7950
Purchase         6,949                 49.8075
Purchase         2,142                 49.0837
Purchase         3,773                 50.7134
Purchase         40                    61.7000 EUR
Purchase         94,533                49.6689
Purchase         152                   48.0500
Purchase         229                   51.8000
Purchase         71,003                49.3866
Purchase         132                   50.1900
Purchase         41,992                50.4500
Purchase         558                   48.0500
Purchase         3,773                 50.7121
Purchase         303,951               50.4700
Purchase         828                   49.1510
Purchase         59,748                50.4700
Purchase         397                   48.5025
Purchase         1,413                 48.2860
Purchase         1,700                 50.1258
Purchase         640                   48.0500
Sale             1,955                 Transfer
Sale             52,591                48.4569
Sale             472,400               49.5307
Sale             34,433                51.7200
Sale             3,787                 48.5593
Sale             46,716                48.4490
Sale             12                    48.6900
Sale             3,773                 50.7134
Sale             20,000                48.5740
Sale             1,712                 Transfer
Sale             3,169                 49.0983
Sale             5,003                 48.5109
Sale             18,927                48.4539
Sale             538                   48.9259
Sale             800                   50.0545
Sale             43                    Transfer
Sale             23                    Transfer
Sale             640                   48.0500
Sale             12,044                48.0500
Sale             2,230                 48.0500
Sale             2,788                 49.0734
Sale             301                   49.1828
Sale             204                   48.0500
Sale             232                   48.0500
Sale             325                   49.1694
Sale             1,233                 48.0500
Sale             185                   48.5697
Sale             1,455                 49.0718
Sale             400                   63.1300 EUR
Sale             1,481                 49.9769
Sale             59,748                50.4700
Sale             303,951               50.4700
Sale             4,351                 50.3280
Sale             10,296                53.4000
Sale             4,052                 48.0500
Sale             50                    48.3064
Sale             930                   49.0599
Sale             1,413                 48.2860
Sale             50                    48.5426
Sale             52,752                49.0920
Sale             40,200                48.0500
Sale             15,763                49.0922
Sale             2,348                 48.0500
Sale             900                   48.6700
Sale             125                   50.2726
Sale             811                   48.0500
Sale             600                   48.7950
Sale             1,233                 48.0500
Sale             1,452                 49.0693
Sale             1,170                 48.0500
Sale             1,120                 48.0500
Sale             1,309                 49.0615
Sale             2,135                 49.0705
Sale             1,753                 48.0500
Sale             50                    50.4184

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          46716         48.449
CFD            Long          18927         48.4539
CFD            Long          52591         48.4568
CFD            Long          5003          48.5109
CFD            Long          835           48.5123
CFD            Long          3787          48.5593
CFD            Long          600           48.795
CFD            Long          538           48.9258
CFD            Long          757           49.8565
CFD            Long          800           50.0544
CFD            Short         6594          48.1484
CFD            Short         1413          48.286
CFD            Short         3500          48.6523
CFD            Short         600           48.795
CFD            Short         793           48.8931
CFD            Short         1787          48.9025
CFD            Short         71003         49.3866
CFD            Short         3914          49.414
CFD            Short         94533         49.6689
CFD            Short         6949          49.8075
CFD            Short         62336         49.8888
CFD            Short         10497         50.0458
CFD            Short         3824          50.1062
CFD            Short         1700          50.1258
CFD            Short         3773          50.7133

(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                         05 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