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               20 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      48,084,589      4.82%       542,879     0.05%
securities
(2) Derivatives      589,631      0.06%     2,451,900     0.25%
(other than
options)
(3) Options and      101,200      0.01%       276,978     0.03%
agreements to
purchase/sell
Total             48,775,420      4.89%     3,271,757     0.33%


(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         150                   24.7050
Purchase         2,282                 22.5000
Purchase         2,493                 25.4500
Purchase         10,803                25.4500
Purchase         2,888                 25.4500
Purchase         1,142                 23.5000
Purchase         6,677                 21.7479
Purchase         21,507                23.6421
Purchase         1,389                 23.5000
Purchase         788                   22.0363
Purchase         22,840                23.5000
Purchase         33,380                25.4500
Purchase         13,400                22.0000
Purchase         1,387                 24.1045
Purchase         419                   23.7200
Purchase         4,000                 21.2806
Purchase         100                   24.4900
Purchase         38                    Transfer
Purchase         7,877                 23.9441
Purchase         39,668                24.1119
Purchase         17,000                25.4500
Purchase         134,814               21.5004
Purchase         11,218                25.4500
Purchase         629                   23.6103
Purchase         69,831                25.4500
Purchase         788                   24.0200
Purchase         44,304                24.2188
Purchase         1,866                 23.9028
Purchase         1,142                 25.4500
Purchase         425                   24.2132
Purchase         3,753                 25.4500
Purchase         2,490                 22.5000
Purchase         425                   25.4500
Purchase         58,114                24.1180
Purchase         850                   25.4500
Purchase         1,432                 23.8588
Purchase         9,269                 22.5000
Purchase         2,284                 25.4500
Purchase         60,000                22.5000
Sale             84,995                24.9870
Sale             43,807                24.0717
Sale             27,179                24.1213
Sale             230,567               24.0739
Sale             16,500                24.3992
Sale             38                    Transfer
Sale             133                   Transfer
Sale             800                   23.7644
Sale             94                    23.8320
Sale             100                   23.4965
Sale             37                    23.8820
Sale             788                   22.0363
Sale             45,756                25.4500
Sale             44,750                24.2415
Sale             121,962               24.1028
Sale             46,466                25.0897
Sale             100                   24.4900
Sale             150                   23.7540
Sale             6,189                 24.1991
Sale             54                    24.1009
Sale             10,774                24.1240
Sale             90                    31.0200 EUR
Sale             2,490                 22.5000
Sale             31,592                23.9614
Sale             1,254                 23.6500
Sale             817                   23.7162

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          100           23.4965
CFD            Long          800           23.7644
CFD            Long          31592         23.9614
CFD            Long          43807         24.0716
CFD            Long          230567        24.0739
CFD            Long          121962        24.1028
CFD            Long          27179         24.1212
CFD            Long          6189          24.1991
CFD            Long          44750         24.2415
CFD            Long          16500         24.3991
CFD            Long          100           24.49
CFD            Long          84995         24.987
CFD            Long          46466         25.0896
CFD            Short         134814        21.5004
CFD            Short         60000         22.5
CFD            Short         21507         23.6421
CFD            Short         1866          23.9027
CFD            Short         7877          23.9441
CFD            Short         1387          24.1045
CFD            Short         39668         24.1118
CFD            Short         170949        24.1168
CFD            Short         58114         24.118
CFD            Short         425           24.2132
CFD            Short         44304         24.2188
CFD            Short         265000        24.4251
CFD            Short         100           24.49
CFD            Short         1760          25.45

(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                         21 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   -125,000               45.0000          AMER           20/03/2009
Option            Purchased   100,000                56.0000          AMER           18/12/2009
Option            Purchased   -113                   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