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               31 July 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      46,449,435       4.65%      994,117      0.10%
securities
(2) Derivatives      742,684       0.07%    1,591,502      0.16%
(other than
options)
(3) Options and      101,200       0.01%      101,300      0.01%
agreements to
purchase/sell
Total             47,293,519       4.74%    2,686,919      0.27%


(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         10,546                53.4000
Purchase         1,477                 53.4000
Purchase         1,113                 53.4000
Purchase         7,500                 53.3803
Purchase         5,932                 53.4000
Purchase         1,500                 53.8187
Purchase         10,502                54.1800
Purchase         466                   53.4688
Purchase         461                   53.4000
Purchase         8,123                 53.8053
Purchase         4,529                 53.2903
Purchase         171                   53.4000
Purchase         2,200                 54.2459
Purchase         42,007                54.1800
Purchase         56,000                54.0000
Purchase         34,528                53.6170
Purchase         1,406                 54.1329
Purchase         100                   53.5180
Purchase         201                   53.4000
Purchase         4,044                 53.4000
Purchase         4,600                 53.2335
Purchase         112                   53.4000
Purchase         50                    67.3700 EUR
Purchase         1,101                 53.4000
Purchase         942                   53.4000
Purchase         80                    53.4000
Purchase         10,000                53.4000
Sale             1,980                 53.4000
Sale             85                    53.3826
Sale             95                    54.9663
Sale             2,752                 54.0766
Sale             7,500                 53.3803
Sale             5,529                 53.5072
Sale             45,225                53.4000
Sale             9,166                 53.6580
Sale             23,757                53.8065
Sale             96                    54.1626
Sale             111,837               54.2475
Sale             40                    54.0766
Sale             39,285                54.2855
Sale             81                    53.1963
Sale             10,504                53.5866
Sale             4,600                 53.2335
Sale             7,023                 53.4382
Sale             54,303                53.4762
Sale             16,649                53.4000
Sale             100                   54.3121
Sale             391                   53.4000
Sale             250                   54.2626
Sale             21                    54.0766
Sale             610                   54.2475
Sale             6,042                 54.2475
Sale             21                    54.0766
Sale             69                    54.0766
Sale             52,386                54.1467
Sale             268                   54.0700
Sale             2,296                 54.2078
Sale             50                    69.8700 EUR
Sale             395                   53.4000
Sale             418                   54.0000
Sale             662                   54.2475
Sale             3,246                 54.2475
Sale             33,433                54.2475
Sale             163                   54.0766
Sale             6,311                 54.2475
Sale             2,091                 54.2475
Sale             465                   53.4000
Sale             138                   54.0766
Sale             69                    54.0766
Sale             826                   54.0766
Sale             2,806                 54.2475
Sale             58                    54.0766
Sale             102                   54.0766
Sale             4,680                 54.2475
Sale             3,638                 53.4000
Sale             3,236                 54.2475
Sale             100                   53.1700

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          4600          53.2334
CFD            Long          7500          53.3802
CFD            Long          45225         53.4
CFD            Long          7023          53.4382
CFD            Long          54303         53.4762
CFD            Long          5529          53.5071
CFD            Long          10504         53.5865
CFD            Long          9166          53.6579
CFD            Long          23757         53.8064
CFD            Long          39285         54.2855
CFD            Short         4600          53.2334
CFD            Short         4529          53.2903
CFD            Short         7500          53.3802
CFD            Short         466           53.4687
CFD            Short         100           53.518
CFD            Short         34528         53.617
CFD            Short         8123          53.8052
CFD            Short         1500          53.8186
CFD            Short         6489          53.8733
CFD            Short         4585          53.8785
CFD            Short         27084         54.1916
CFD            Short         2159          54.1931
CFD            Short         2200          54.2459

(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                         01 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