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               18 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      46,423,580       4.65%      861,626      0.09%
securities
(2) Derivatives      703,906       0.07%    1,758,878      0.18%
(other than
options)
(3) Options and      101,200       0.01%      101,030      0.00%
agreements to
purchase/sell
Total             47,228,686       4.73%    2,721,534      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
                                       (GBP)
Purchase         126,224               51.3500
Purchase         16,536                49.9569
Purchase         2,000                 49.5074
Purchase         60                    49.7700
Purchase         21,800                50.4052
Purchase         7,650                 49.9133
Purchase         3,078                 50.7000
Purchase         504                   50.3000
Purchase         3,178                 50.7000
Purchase         1,800                 49.5221
Purchase         5                     51.3500
Purchase         1,000                 50.3983
Purchase         1,625                 49.9013
Purchase         27,626                51.3500
Purchase         1,680                 50.7000
Purchase         850                   50.7000
Purchase         2,142                 50.7000
Purchase         27,621                50.7000
Purchase         3,090                 50.2530
Purchase         13,600                50.2650
Purchase         3,100                 50.1889
Purchase         12,893                50.7000
Purchase         126,337               49.2525
Purchase         810                   50.2500
Purchase         18                    51.6958
Purchase         4,121                 50.2485
Purchase         6,800                 50.1190
Sale             1,073,862             Transfer
Sale             58                    49.2384
Sale             15,025                49.3238
Sale             1,000                 99.4700 USD
Sale             27,626                51.3500
Sale             19,752                50.5043
Sale             2,103                 50.6715
Sale             15,628                49.8839
Sale             42                    50.2026
Sale             400                   50.6416
Sale             53,425                49.6758
Sale             50                    49.7063
Sale             3,105                 50.2406
Sale             10,000                50.7000
Sale             5                     51.3500
Sale             54                    50.8372
Sale             27,621                50.7000
Sale             17,198                49.6147
Sale             170                   50.9342
Sale             17,856                49.7212
Sale             63                    50.0124
Sale             80                    50.6484
Sale             7,760                 50.7000
Sale             375                   49.1400
Sale             200                   50.0000
Sale             100                   50.0000
Sale             200                   50.0000
Sale             100                   50.2300
Sale             373                   50.0000
Sale             200                   50.0000
Sale             60                    50.0000
Sale             68                    50.0000
Sale             107                   49.5720
Sale             100                   63.0100 EUR
Sale             190                   49.5025
Sale             1,763                 49.5025
Sale             50                    49.3526
Sale             100                   50.0000
Sale             45                    50.0463
Sale             1,800                 49.5221
Sale             110                   50.0000
Sale             110                   50.0000
Sale             75                    50.0000
Sale             60                    50.0000
Sale             150                   50.1984
Sale             200                   50.0000
Sale             3,344                 50.7000
Sale             225                   50.0000
Sale             400                   50.0000
Sale             60                    50.0000
Sale             60                    50.0000
Sale             100                   49.2700
Sale             80                    49.3526
Sale             60                    50.3847
Sale             200                   50.0000

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          15025         49.3238
CFD            Long          1800          49.5221
CFD            Long          17198         49.6146
CFD            Long          53425         49.6758
CFD            Long          17856         49.7211
CFD            Long          15628         49.8839
CFD            Long          1492          49.922
CFD            Long          3105          50.2405
CFD            Long          19752         50.5043
CFD            Long          400           50.6416
CFD            Long          2103          50.6714
CFD            Short         2000          49.5074
CFD            Short         1800          49.5221
CFD            Short         746           49.8471
CFD            Short         1625          49.9013
CFD            Short         7650          49.9132
CFD            Short         16536         49.9569
CFD            Short         6800          50.1189
CFD            Short         3100          50.1889
CFD            Short         4121          50.2485
CFD            Short         3090          50.2529
CFD            Short         13600         50.2649
CFD            Short         1000          50.3983

(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                         21 July 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.
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

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   -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   -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