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               29 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      46,425,818       4.65%      535,615      0.05%
securities
(2) Derivatives      803,655       0.08%    1,541,685      0.15%
(other than
options)
(3) Options and      101,200       0.01%      152,000      0.02%
agreements to
purchase/sell
Total             47,330,673       4.74%    2,229,300      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         3,926                 34.9554
Purchase         41,901                34.7900
Purchase         17,700                33.3177
Purchase         80,085                34.3409
Purchase         31,460                33.2418
Purchase         1,690                 34.3721
Purchase         20,950                34.7600
Purchase         161,092               34.5490
Purchase         713                   33.3574
Purchase         7,468                 33.1000
Purchase         1,699                 33.1000
Purchase         41,901                34.7900
Purchase         1,218                 33.1000
Purchase         44,787                35.0039
Purchase         12,334                38.2300
Purchase         42                    35.1600
Purchase         1,868                 35.3016
Purchase         125                   46.6000 EUR
Purchase         75                    43.6000 EUR
Purchase         7,269                 33.1000
Purchase         31,400                34.2674
Purchase         29,155                33.1000
Purchase         250                   33.7300
Purchase         17,692                33.1000
Purchase         5,831                 33.1000
Sale             72                    Transfer
Sale             135                   34.1210
Sale             38                    37.4710
Sale             120                   Transfer
Sale             171                   Transfer
Sale             25                    Transfer
Sale             4,251                 33.1000
Sale             47                    35.3410
Sale             57,976                34.1988
Sale             62,510                34.2481
Sale             13,515                33.7581
Sale             30,011                33.3158
Sale             18                    Transfer
Sale             15,091                33.1000
Sale             55                    33.0731
Sale             10,391                33.1000
Sale             7,269                 33.1000
Sale             12,334                38.2300
Sale             8,001                 33.1000
Sale             1,562                 33.6480

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          30011         33.3157
CFD            Long          1562          33.648
CFD            Long          13515         33.7581
CFD            Long          57976         34.1988
CFD            Long          62510         34.2481
CFD            Long          10252         34.4745
CFD            Short         31460         33.2417
CFD            Short         17700         33.3177
CFD            Short         31400         34.2674
CFD            Short         80085         34.3408
CFD            Short         1690          34.3721
CFD            Short         161092        34.549
CFD            Short         3926          34.9553
CFD            Short         44787         35.0038

(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                         30 September 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