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 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      48,902,849     4.90%        561,476     0.06%
securities
(2) Derivatives      698,402     0.07%      2,564,526     0.26%
(other than
options)
(3) Options and      101,200     0.01%        276,959     0.03%
agreements to
purchase/sell
Total             49,702,451     4.98%      3,402,961     0.34%


(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         112,240               21.8447
Purchase         2,697                 20.8837
Purchase         5,159                 20.8837
Purchase         1,040                 20.9415
Purchase         1,699                 22.7700
Purchase         2,555                 20.7864
Purchase         196                   22.7700
Purchase         7,584                 22.7700
Purchase         779                   20.8837
Purchase         100                   20.5900
Purchase         83,549                21.1514
Purchase         420                   Transfer
Purchase         10,000                21.6764
Purchase         6,554                 21.7549
Purchase         440                   21.2873
Purchase         1,158                 21.2204
Purchase         78,977                21.5464
Purchase         19,157                21.0425
Purchase         1,629                 21.8443
Purchase         20,706                21.2720
Purchase         3,231                 20.7717
Purchase         447                   22.7700
Purchase         4,568                 22.7700
Purchase         10,278                21.3200
Purchase         9,972                 22.7700
Purchase         387                   20.7441
Purchase         31,267                22.7700
Purchase         4,465                 22.7700
Purchase         13,284                22.7700
Purchase         39,026                22.7700
Purchase         339                   20.8837
Purchase         311                   20.8837
Purchase         270                   20.8837
Purchase         521                   20.8837
Purchase         737                   20.8837
Purchase         380                   20.8837
Sale             100                   20.5900
Sale             2,110                 Transfer
Sale             20,007                21.0599
Sale             57,346                21.4791
Sale             150                   20.4700
Sale             54                    Transfer
Sale             838                   21.3300
Sale             513                   34.1700 USD
Sale             183                   21.9811
Sale             21,729                21.2931
Sale             29,920                20.9038
Sale             200                   20.1420
Sale             150                   20.5100
Sale             2,927                 20.9455
Sale             1,000                 20.8800
Sale             43                    22.5340
Sale             500                   20.5700
Sale             150                   20.8273
Sale             55                    20.9620
Sale             864                   21.3368
Sale             4,760                 21.8603
Sale             28                    22.5020
Sale             51,749                22.3796
Sale             7,500                 22.6849

(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           20.59
CFD            Long          150           20.8273
CFD            Long          29920         20.9038
CFD            Long          2927          20.9455
CFD            Long          20007         21.0598
CFD            Long          21729         21.2931
CFD            Long          864           21.3367
CFD            Long          57346         21.479
CFD            Long          7071          21.6594
CFD            Long          70942         21.6647
CFD            Long          4577          21.687
CFD            Long          4760          21.8603
CFD            Long          183           21.981
CFD            Long          51749         22.3796
CFD            Long          7500          22.6849
CFD            Short         100           20.59
CFD            Short         2555          20.7863
CFD            Short         19157         21.0424
CFD            Short         16426         21.0782
CFD            Short         83549         21.1514
CFD            Short         1158          21.2203
CFD            Short         20706         21.272
CFD            Short         440           21.2872
CFD            Short         16900         21.3557
CFD            Short         886           21.3632
CFD            Short         78977         21.5464
CFD            Short         10000         21.6764
CFD            Short         6554          21.7548
CFD            Short         1629          21.8442
CFD            Short         112240        21.8446

(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)

Put             Selling           1                  52       EURO            19/12/2008   0.00

(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                         27 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   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   -94                    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   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

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