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               06 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      47,036,424       4.71%      577,099      0.06%
securities
(2) Derivatives      834,265       0.08%    1,629,383      0.16%
(other than
options)
(3) Options and      101,200       0.01%      276,998      0.03%
agreements to
purchase/sell
Total             47,834,473       4.79%    2,442,730      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         2,000                 52.0000
Purchase         850                   28.8800
Purchase         1,600                 29.6144
Purchase         99,855                30.1161
Purchase         200                   30.0800
Purchase         10,041                28.8800
Purchase         6,689                 29.7500
Purchase         10,041                28.8800
Purchase         2,000                 52.0000
Purchase         3,223                 30.2687
Purchase         11,361                30.3577
Purchase         23,931                29.6893
Purchase         750                   32.2100
Purchase         22                    31.6200
Purchase         12,543                29.0096
Purchase         27,500                30.1330
Purchase         13,417                29.1702
Purchase         178,163               36.9943
Purchase         17,816                30.1486
Purchase         2,010                 28.8800
Purchase         650                   30.5500
Purchase         500                   29.6500
Purchase         47,359                28.8800
Purchase         60                    30.3100
Purchase         100                   29.9000
Purchase         200                   28.9400
Purchase         10,816                33.9800
Purchase         32,000                28.8191
Purchase         713                   29.1337
Sale             3,429                 33.9800
Sale             5,680                 30.1150
Sale             40,995                34.8700
Sale             245                   32.4824
Sale             2,000                 52.0000
Sale             200                   30.0800
Sale             25,277                28.8184
Sale             13,075                29.1242
Sale             158,214               29.4111
Sale             886                   29.4558
Sale             62                    30.5200
Sale             10,014                28.8800
Sale             8                     30.3850
Sale             167,500               36.9943
Sale             10,041                28.8800
Sale             18,847                29.4673
Sale             20,221                30.5269
Sale             10                    30.3000
Sale             29,330                28.8800
Sale             620                   30.6100

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          25277         28.8183
CFD            Long          13075         29.1242
CFD            Long          158214        29.411
CFD            Long          886           29.4558
CFD            Long          18847         29.4672
CFD            Long          200           30.08
CFD            Long          5680          30.1149
CFD            Short         32000         28.819
CFD            Short         12543         29.0095
CFD            Short         13417         29.1701
CFD            Short         1665          29.6139
CFD            Short         1600          29.6144
CFD            Short         23931         29.6892
CFD            Short         200           30.08
CFD            Short         99855         30.116
CFD            Short         17816         30.1486
CFD            Short         3223          30.2687
CFD            Short         11361         30.3577

(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)
Call            Purchase          125000             45        AMER            20/03/2009   1.37

(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                         07 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   -133                   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