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               03 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      47,026,668       4.71%      449,439      0.05%
securities
(2) Derivatives      706,605       0.07%    1,841,291      0.18%
(other than
options)
(3) Options and      101,200       0.01%      152,000      0.02%
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         303,957               32.2800
Purchase         3127                  33.9800
Purchase         915                   32.1500
Purchase         2,192                 33.5338
Purchase         400                   33.5444
Purchase         52                    32.6400
Purchase         400                   32.9250
Purchase         5,726                 33.9800
Purchase         2,232                 32.3900
Purchase         12,771                32.4242
Purchase         68,000                32.1000
Purchase         940                   31.5539
Purchase         25,778                33.5609
Purchase         1,467                 34.0656
Purchase         40,000                32.1000
Purchase         120,000               33.3261
Purchase         100                   32.9440
Purchase         15                    32.5947
Purchase         69,864                32.3128
Purchase         565                   31.5909
Purchase         245                   32.2700
Purchase         7,221                 34.7100
Purchase         4,488                 31.5909
Purchase         21,917                33.5658
Purchase         200                   32.2036
Purchase         319                   31.5909
Purchase         372                   31.5909
Purchase         245                   32.2700
Purchase         26,078                33.9800
Purchase         39,405                32.1000
Purchase         100                   33.4300
Purchase         848                   32.4075
Purchase         100                   32.5700
Purchase         2,377                 33.9800
Purchase         1,109                 33.9800
Purchase         1,700                 33.9800
Sale             3,600                 33.6318
Sale             60                    40.3100
Sale             55,801                32.3557
Sale             4,052                 33.6021
Sale             800                   32.9251
Sale             2,400                 32.4651
Sale             90,175                33.1733
Sale             1,678                 33.9800
Sale             20,950                33.9700
Sale             5,022                 32.3133
Sale             915                   32.1500
Sale             24,466                32.6564
Sale             100                   32.9440
Sale             5,726                 33.9684
Sale             39,405                32.1000

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          55801         32.3557
CFD            Long          2400          32.4651
CFD            Long          24466         32.6564
CFD            Long          800           32.925
CFD            Long          100           32.944
CFD            Long          90175         33.1732
CFD            Long          3600          33.6318
CFD            Short         940           31.5538
CFD            Short         108000        32.1
CFD            Short         303957        32.28
CFD            Short         69864         32.3128
CFD            Short         5923          32.3275
CFD            Short         12771         32.4242
CFD            Short         15            32.5946
CFD            Short         400           32.9249
CFD            Short         100           32.944
CFD            Short         120000        33.326
CFD            Short         2192          33.5338
CFD            Short         400           33.5444
CFD            Short         25778         33.5608
CFD            Short         21917         33.5658

(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                         06 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   -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
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

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