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               26 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      46,086,779       4.62%      818,802      0.08%
securities
(2) Derivatives    1,010,627       0.10%    1,552,343      0.16%
(other than
options)
(3) Options and      101,200       0.01%      152,000      0.02%
agreements to
purchase/sell
Total             47,198,606       4.73%    2,523,145      0.25%


(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         5,483                 38.4776
Purchase         1,388                 37.9835
Purchase         64,435                37.5872
Purchase         1,800                 38.5431
Purchase         48,248                38.0193
Purchase         50,618                38.0476
Purchase         807                   37.4209
Purchase         873                   39.2074
Purchase         1,000                 39.9139
Purchase         38,343                37.9348
Purchase         6,500                 38.0061
Purchase         1,907                 37.0500
Purchase         125                   37.8300
Purchase         8,330                 37.0500
Purchase         1,800                 39.3488
Purchase         125                   38.2300
Sale             1,008                 40.0300
Sale             60                    Transfer
Sale             27                    38.0730
Sale             19,924                37.4361
Sale             5,500                 38.0629
Sale             79                    Transfer
Sale             1,100                 37.6247
Sale             9,427                 37.5515
Sale             1,800                 39.3488
Sale             40,541                39.7972
Sale             38                    38.9370
Sale             101,656               37.4311
Sale             600                   38.5000
Sale             45                    38.4960
Sale             808                   40.0300
Sale             35,485                37.3886
Sale             45                    40.0630
Sale             260                   38.6300
Sale             515                   38.3577
Sale             34                    39.8820
Sale             635                   38.5000
Sale             50                    37.6630
Sale             50                    37.6630
Sale             4,684                 37.0500
Sale             19                    39.8820

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          35485         37.3886
CFD            Long          101656        37.431
CFD            Long          19924         37.436
CFD            Long          9427          37.5514
CFD            Long          1100          37.6247
CFD            Long          134           37.8487
CFD            Long          5500          38.0629
CFD            Long          2122          38.073
CFD            Long          40541         39.7971
CFD            Short         64435         37.5871
CFD            Short         3885          37.76
CFD            Short         3987          37.7609
CFD            Short         38343         37.9347
CFD            Short         1388          37.9835
CFD            Short         6500          38.0061
CFD            Short         48248         38.0193
CFD            Short         50618         38.0475
CFD            Short         5483          38.4775
CFD            Short         1800          38.5431
CFD            Short         873           39.2073
CFD            Short         1000          39.9138

(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                         29 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