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               24 September 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      46,122,982       4.62%      723,404      0.07%
securities
(2) Derivatives      913,888       0.09%    1,429,168      0.14%
(other than
options)
(3) Options and      101,200       0.01%      152,000      0.02%
agreements to
purchase/sell
Total             47,138,070       4.72%    2,304,572      0.23%


(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         99                    39.8400
Purchase         1,738                 42.8772
Purchase         5,100                 39.9200
Purchase         1,800                 39.9200
Purchase         5,000                 39.9200
Purchase         26,924                40.7723
Purchase         29,170                40.8817
Purchase         1,600                 39.7802
Purchase         15,820                39.8194
Purchase         29,245                39.7843
Purchase         254                   40.0900
Purchase         2,139                 40.2300
Purchase         6,664                 39.9200
Purchase         100                   40.8200
Purchase         1,009                 40.0900
Purchase         86                    40.2900
Purchase         1,800                 40.2300
Purchase         100                   39.8800
Purchase         61                    40.7000
Sale             1,738                 42.8772
Sale             219                   40.9320
Sale             1,900                 40.8091
Sale             55,691                39.8764
Sale             89,246                39.9836
Sale             90                    40.7830
Sale             1,600                 40.8091
Sale             42                    40.1520
Sale             30,000                40.4500
Sale             2,400                 39.6052
Sale             99                    40.9110
Sale             46,234                39.9435
Sale             100                   40.8200
Sale             18                    41.2210
Sale             20                    39.2750
Sale             66,310                40.5000
Sale             307                   40.6800
Sale             60                    39.8510
Sale             34,449                39.8529
Sale             75                    40.3380
Sale             150                   40.3380
Sale             2,005                 40.3101
Sale             234                   40.3101
Sale             3,497                 39.9200
Sale             264,433               40.8730

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          2400          39.6052
CFD            Long          34449         39.8528
CFD            Long          55691         39.8763
CFD            Long          46234         39.9435
CFD            Long          89246         39.9836
CFD            Long          66310         40.5
CFD            Long          307           40.68
CFD            Long          6580          40.7676
CFD            Long          100           40.82
CFD            Long          264433        40.8729
CFD            Short         1600          39.7802
CFD            Short         29245         39.7842
CFD            Short         15820         39.8194
CFD            Short         8264          40.19
CFD            Short         26924         40.7722
CFD            Short         100           40.82
CFD            Short         29170         40.8817

(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           Selling            300                44       EURO             19/12/08    6.45
Put            Selling            300                44       EURO             19/12/08    3.45


(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                         25 September 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   100,000                56.0000          AMER           18/12/2009
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



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