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               30 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      46,732,291       4.67%      902,016      0.09%
securities
(2) Derivatives      685,970       0.07%    1,648,222      0.16%
(other than
options)
(3) Options and      101,200       0.01%      101,300      0.01%
agreements to
purchase/sell
Total             47,519,461       4.75%    2,651,538      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         1,218                 53.5400
Purchase         188,879               52.9000
Purchase         36,385                53.1625
Purchase         200                   53.4800
Purchase         700                   53.1388
Purchase         3,600                 53.4080
Purchase         10,405                25.2871
Purchase         29,829                53.2853
Purchase         188,879               52.9000
Purchase         6,467                 53.3669
Purchase         9,130                 53.3124
Purchase         23,800                52.9396
Purchase         55                    52.7900
Purchase         10,405                1.1046
Purchase         1,395                 53.5400
Purchase         15,000                53.5400
Purchase         4,804                 53.4200
Purchase         1,326                 53.5400
Sale             188,879               52.9000
Sale             110                   52.8400
Sale             11,745                52.8243
Sale             100                   52.7705
Sale             6,433                 53.1485
Sale             80                    52.8342
Sale             22                    52.6413
Sale             54                    52.8100
Sale             65                    52.7805
Sale             2,230                 52.9989
Sale             530                   52.8000
Sale             182                   52.8000
Sale             40                    66.8600 EUR
Sale             266                   53.3600
Sale             125                   52.8442
Sale             150                   52.8342
Sale             160                   52.8906
Sale             10,903                52.7724
Sale             49                    52.8084
Sale             168                   53.0563
Sale             37,189                53.0231
Sale             200                   53.4000
Sale             7,844                 53.2669
Sale             24,978                52.7758
Sale             463                   53.5400
Sale             28,875                52.9063
Sale             2,295                 53.0399
Sale             700                   52.5300

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          700           52.53
CFD            Long          22            52.6413
CFD            Long          10903         52.7724
CFD            Long          24978         52.7758
CFD            Long          11745         52.8242
CFD            Long          4395          52.8408
CFD            Long          28875         52.9063
CFD            Long          2230          52.9989
CFD            Long          37189         53.0231
CFD            Long          2295          53.0398
CFD            Long          6433          53.1484
CFD            Long          7844          53.2668
CFD            Short         10405         1.1045
CFD            Short         10405         25.287
CFD            Short         2741          52.8585
CFD            Short         23800         52.9396
CFD            Short         395           52.9411
CFD            Short         700           53.1388
CFD            Short         36385         53.1624
CFD            Short         29829         53.2852
CFD            Short         9130          53.3123
CFD            Short         6467          53.3668
CFD            Short         3600          53.4079
CFD            Short         4804          53.42

(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                         31 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)


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   -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