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               23 October 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      48,628,603     4.87%        659,415     0.07%
securities
(2) Derivatives      706,167     0.07%      2,480,839     0.25%
(other than
options)
(3) Options and      101,200     0.01%        276,960     0.03%
agreements to
purchase/sell
Total             49,435,970     4.95%      3,417,214     0.34%


(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         8,581                 21.5209
Purchase         29,273                21.3270
Purchase         38,116                21.4608
Purchase         149,083               21.6608
Purchase         58,072                20.8102
Purchase         125,172               21.7340
Purchase         8,353                 21.9794
Purchase         850                   22.4000
Purchase         1,050                 21.2600
Purchase         84,719                21.2770
Purchase         7,642                 20.7320
Purchase         47,000                23.3107
Purchase         6,257                 22.2820
Purchase         40,000                23.8900
Purchase         16,281                21.2172
Purchase         779                   21.3354
Purchase         80,000                23.8900
Purchase         500                   20.7400
Purchase         714                   21.0227
Purchase         2,284                 22.4000
Purchase         3,426                 22.2100
Purchase         1,495                 22.2002
Purchase         12,865                22.2100
Purchase         100                   26.1100 EUR
Purchase         2,179                 22.2002
Purchase         1,152                 22.2100
Purchase         1,149                 22.4000
Purchase         230                   21.2400
Purchase         200                   21.8000
Purchase         1,901                 22.4000
Sale             52                    23.9920
Sale             9,288                 21.9390
Sale             7                     21.9040
Sale             523                   Transfer
Sale             10,887                22.0588
Sale             1,203                 20.8500
Sale             19                    21.9400
Sale             130                   21.3000
Sale             82,087                21.7376
Sale             4,435                 22.4000
Sale             53                    20.6521
Sale             100                   22.1330
Sale             1,500                 Transfer
Sale             80,192                22.1196
Sale             1,901                 22.4000
Sale             779                   22.3167
Sale             66                    23.9030
Sale             68                    23.9710
Sale             37,982                21.4428

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          37982         21.4427
CFD            Long          82087         21.7376
CFD            Long          9288          21.939
CFD            Long          10887         22.0587
CFD            Long          80192         22.1196
CFD            Long          779           22.3166
CFD            Short         7642          20.7319
CFD            Short         58072         20.8102
CFD            Short         16281         21.2171
CFD            Short         84719         21.2769
CFD            Short         29273         21.3269
CFD            Short         779           21.3354
CFD            Short         38116         21.4607
CFD            Short         8581          21.5208
CFD            Short         12196         21.5959
CFD            Short         149083        21.6607
CFD            Short         125172        21.7339
CFD            Short         8353          21.9793
CFD            Short         12739         22.045
CFD            Short         6257          22.2819
CFD            Short         9596          22.4
CFD            Short         9607          22.7121
CFD            Short         47000         23.3106
CFD            Short         120000        23.89

(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                         24 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   100,000                56.0000          AMER           18/12/2009
Option            Purchased   -50,000                64.0000          AMER           21/11/2008
Option            Purchased   -100,000               64.0000          AMER           21/11/2008
Option            Purchased   -125,000               45.0000          AMER           20/03/2009
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   -95                    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

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