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               15 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      47,094,672      4.70%       643,988     0.06%
securities
(2) Derivatives      889,271      0.09%     1,524,203     0.15%
(other than
options)
(3) Options and      101,200      0.01%       276,980     0.03%
agreements to
purchase/sell
Total             48,085,143      4.80%      2,445,171    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         450                   23.3300
Purchase         50                    30.2200 EUR
Purchase         200                   30.5000 EUR
Purchase         894                   28.2600
Purchase         300                   23.5600
Purchase         19,813                23.3842
Purchase         16                    Transfer
Purchase         48,000                25.5277
Purchase         50,300                23.6271
Purchase         11,615                23.5700
Purchase         180                   24.0000
Purchase         180                   28.5227
Purchase         1,041                 25.6338
Purchase         2,141                 23.5700
Purchase         1,400                 23.4500
Purchase         2,872                 23.5700
Purchase         90,392                23.8258
Purchase         3,320                  24.9548
Purchase         151,054               23.7329
Purchase         23,280                24.4830
Purchase         21,730                26.1555
Purchase         698                   23.5700
Purchase         246                   Transfer
Purchase         5,200                 25.1185
Purchase         13,400                24.8993
Purchase         77,987                25.1595
Purchase         13,002                25.1198
Purchase         1,288                 23.5700
Purchase         41,550                28.2600
Purchase         18,200                26.2570
Purchase         1,110                 23.5700
Purchase         850                   23.5700
Purchase         206                   23.5700
Purchase         569                   25.6338
Purchase         713                   23.5700
Purchase         715                   28.2600
Purchase         7,994                 28.2600
Purchase         2,463                 26.1361
Purchase         9,136                 28.2600
Purchase         713                   23.5700
Purchase         4,986                 28.2600
Purchase         5,817                 28.2600
Purchase         86,478                28.2600
Purchase         10,816                23.5700
Purchase         3,324                 28.2600
Purchase         563                   25.6338
Purchase         197                   26.5562
Purchase         985                   26.5562
Purchase         358                   28.2600
Sale             84                    24.7240
Sale             57,046                24.8764
Sale             52                    25.5000
Sale             105                   26.3000
Sale             48,000                25.5277
Sale             40,534                25.9411
Sale             170                   25.1250
Sale             39                    Transfer
Sale             800                   25.1762
Sale             17                    30.7400
Sale             395                   25.3000
Sale             246                   Transfer
Sale             621                   27.5800
Sale             75,259                23.7086
Sale             17,023                23.5700
Sale             50,300                23.6271
Sale             875                   25.6053
Sale             3,320                 24.9548
Sale             134                   28.2600
Sale             7,295                 25.6758
Sale             23,073                24.4416
Sale             206                   23.5700
Sale             6,265                 24.9094
Sale             1,135                 23.5700
Sale             3,320                 24.9573
Sale             123,069               23.6452
Sale             4,037                 24.4432
Sale             727                   25.6053
Sale             48,000                25.5277
Sale             5,559                 28.2600

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          2180          23.57
CFD            Long          50300         23.6271
CFD            Long          123069        23.6452
CFD            Long          75259         23.7086
CFD            Long          23073         24.4416
CFD            Long          4037          24.4432
CFD            Long          57046         24.8763
CFD            Long          6265          24.9094
CFD            Long          3320          24.9548
CFD            Long          800           25.1762
CFD            Long          48000         25.5277
CFD            Long          7295          25.6757
CFD            Long          40534         25.9411
CFD            Short         19813         23.3841
CFD            Short         10733         23.57
CFD            Short         50300         23.6271
CFD            Short         151054        23.7328
CFD            Short         90392         23.8257
CFD            Short         23280         24.483
CFD            Short         13400         24.8992
CFD            Short         5200          25.1185
CFD            Short         13002         25.1198
CFD            Short         77987         25.1595
CFD            Short         3942          25.2684
CFD            Short         21730         26.1555
CFD            Short         18200         26.257

(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                         16 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   -115                   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