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               25 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      46,079,387       4.62%      775,659      0.08%
securities
(2) Derivatives      965,228       0.10%    1,496,273      0.15%
(other than
options)
(3) Options and      101,200       0.01%      152,000      0.02%
agreements to
purchase/sell
Total             47,145,815       4.72%     2,423,932     0.24%


(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         100                   40.0800
Purchase         8,138                 39.2572
Purchase         38                    Transfer
Purchase         3,100                 40.7828
Purchase         5,500                 39.8701
Purchase         3,200                 39.5971
Purchase         39,011                40.0487
Purchase         920                   39.4304
Purchase         24,885                39.3475
Purchase         1,600                 40.8517
Purchase         50,918                39.2489
Purchase         100                   39.7000
Purchase         120                   39.7000
Purchase         250                   39.8600
Purchase         277                   40.1941
Purchase         1,873                 39.4100
Purchase         901                   40.1941
Purchase         29,285                39.4000
Purchase         572                   39.4000
Purchase         500                   40.0300
Purchase         100                   39.7000
Purchase         100                   39.7000
Purchase         2,279                 39.4000
Purchase         200                   39.7000
Sale             17,000                39.4000
Sale             32                    40.2360
Sale             5,600                 39.3015
Sale             1,715                 39.4229
Sale             1,581                 39.6442
Sale             1,263                 38.9678
Sale             31,296                39.5839
Sale             93                    39.9020
Sale             1,259                 40.0150
Sale             38                    Transfer
Sale             200                   39.9380
Sale             10,500                40.1310
Sale             97                    38.9200
Sale             1,793                 38.9000
Sale             11,910                39.6873
Sale             10,000                39.3520
Sale             39,558                39.5319
Sale             375                   39.6750
Sale             172                   Transfer
Sale             1,629                 40.2248
Sale             100                   40.0800
Sale             150                   39.8880
Sale             47,301                39.4899
Sale             218                   39.4000
Sale             11,000                39.7487
Sale             1,738                 39.9600
Sale             18,000                39.5745
Sale             9,694                 39.9828

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          5600          39.3014
CFD            Long          10000         39.3519
CFD            Long          1715          39.4228
CFD            Long          47301         39.4899
CFD            Long          39558         39.5318
CFD            Long          18000         39.5745
CFD            Long          31296         39.5838
CFD            Long          1581          39.6441
CFD            Long          11910         39.6872
CFD            Long          11000         39.7487
CFD            Long          100           40.08
CFD            Long          10500         40.131
CFD            Short         70154         39.141
CFD            Short         50918         39.2488
CFD            Short         8138          39.2572
CFD            Short         24885         39.3475
CFD            Short         920           39.4304
CFD            Short         5500          39.8701
CFD            Short         39011         40.0487
CFD            Short         100           40.08
CFD            Short         3100          40.7828
CFD            Short         1600          40.8517

(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                         26 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