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 September 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      46,225,943       4.63%      613,117      0.06%
securities
(2) Derivatives      862,951       0.09%    1,464,872      0.15%
(other than
options)
(3) Options and      101,200       0.01%      152,000      0.02%
agreements to
purchase/sell
Total             47,190,094       4.73%    2,229,989      0.22%


(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         2,884                 34.5000
Purchase         28,233                34.2535
Purchase         150                   33.4100
Purchase         475                   34.7100
Purchase         55,100                34.5678
Purchase         3,200                 34.8241
Purchase         1,928                 34.0822
Purchase         32,907                34.6500
Purchase         4,187                 34.7100
Purchase         1,485                 43.7967
Purchase         15,093                34.7100
Purchase         5,000                 31.5341
Purchase         14,000                34.5557
Purchase         2,900                 34.8241
Purchase         20,020                33.7495
Purchase         900                   34.2613
Purchase         7,470                 34.4877
Purchase         18,296                34.2979
Purchase         96                    33.9697
Purchase         1,170                 33.9386
Purchase         1,143                 34.7100
Purchase         6,346                 34.0822
Purchase         17,367                34.7100
Purchase         200                   34.3250
Purchase         84                    34.7100
Purchase         700                   33.5100
Purchase         314                   33.8926
Purchase         92,507                34.7100
Purchase         20,800                34.7100
Purchase         1,907                 34.0822
Purchase         1,443                 34.7100
Purchase         84,000                33.7404
Purchase         75,000                34.5804
Purchase         587                   34.7100
Purchase         722                   34.7100
Purchase         60                    34.4600
Sale             200                   34.3250
Sale             13,000                33.5988
Sale             60                    33.7460
Sale             32,907                34.6500
Sale             1,133                 33.9664
Sale             75,000                34.5804
Sale             81                    34.7900
Sale             249                   33.6360
Sale             79,233                34.5236
Sale             182                   33.8230
Sale             55,967                34.0552
Sale             7,765                 34.7100
Sale             19,953                34.7100
Sale             32,907                34.6500
Sale             45                    39.4900 EUR
Sale             20                    39.4900 EUR
Sale             10                    44.9000 EUR
Sale             500                   43.0000 EUR
Sale             110                   34.4200
Sale             692                   34.7100
Sale             921                   34.7100
Sale             1,654                 34.7100
Sale             160                   34.4900
Sale             1,873                 36.1644
Sale             6,195                 34.7100
Sale             25                    33.8440
Sale             2,033                 34.7100
Sale             75                    34.2500
Sale             6,285                 34.7100
Sale             95,741                34.4318
Sale             92,507                34.7100
Sale             23                    35.1200
Sale             40                    35.2170
Sale             73,911                34.3719
Sale             57                    35.4620
Sale             13,000                34.2766
Sale             92,507                34.7100
Sale             11,528                34.7100

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          13000         33.5988
CFD            Long          1133          33.9663
CFD            Long          55967         34.0551
CFD            Long          13000         34.2766
CFD            Long          200           34.325
CFD            Long          73911         34.3718
CFD            Long          95741         34.4318
CFD            Long          79233         34.5235
CFD            Long          75000         34.5804
CFD            Long          1873          36.1643
CFD            Short         5000          31.5341
CFD            Short         84000         33.7403
CFD            Short         20020         33.7495
CFD            Short         16698         34.0144
CFD            Short         28233         34.2535
CFD            Short         18296         34.2978
CFD            Short         200           34.325
CFD            Short         7470          34.4877
CFD            Short         14000         34.5557
CFD            Short         75000         34.5804
CFD            Short         4032          34.71

(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                         01 October 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   -50,000                64.0000          AMER           21/11/2008
Option            Purchased   -100,000               64.0000          AMER           21/11/2008
Option            Purchased   100,000                56.0000          AMER           18/12/2009
Option            Purchased   -135                   5,200.0000       EURO           19/12/2008
Option            Purchased   -145                   5,200.0000       EURO           19/12/2008
Option            Purchased   -270                   6,400.0000       EURO           19/12/2008
Option            Purchased   -300                   4,400.0000       EURO           19/12/2008
Option            Purchased   -300                   4,400.0000       EURO           19/12/2008
Option            Purchased   -350                   5,000.0000       EURO           19/12/2008
Option            Purchased   -500                   7,000.0000       EURO           19/12/2008
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

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