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               22 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      48,130,786     4.82%        701,374     0.07%
securities
(2) Derivatives      748,126     0.07%      2,000,547     0.20%
(other than
options)
(3) Options and      101,200     0.01%        276,960     0.03%
agreements to
purchase/sell
Total             48,980,112     4.91%      2,978,881     0.30%


(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         1,650                 23.9840
Purchase         162,969               23.8900
Purchase         16,000                25.0065
Purchase         831                   23.8900
Purchase         6,248                 23.5108
Purchase         102,142               24.0741
Purchase         22,312                23.8900
Purchase         9,489                 23.8153
Purchase         300                   24.0733
Purchase         18,000                52.0000
Purchase         7,400                 24.4454
Purchase         39,828                23.9224
Purchase         9,830                 23.7735
Purchase         50                    24.5200
Purchase         7,612                 24.3209
Purchase         40,890                24.4673
Purchase         11,699                25.6000
Purchase         395,879               25.6000
Purchase         26,568                23.8900
Purchase         9,290                 23.8900
Purchase         9,559                 23.8900
Sale             368                   24.1100
Sale             145,288               23.7891
Sale             9,756                 23.8965
Sale             102,641               23.9195
Sale             229                   Transfer
Sale             9,989                 23.8402
Sale             40                    Transfer
Sale             18,163                25.6000
Sale             97,487                24.1711
Sale             600                   24.4900
Sale             50                    24.5200
Sale             600                   31.1600 EUR
Sale             100                   25.8170
Sale             767                   Transfer
Sale             12,710                24.1664
Sale             42,718                23.8182
Sale             200                   23.6300
Sale             80                    23.7610
Sale             102                   23.6120
Sale             300                   24.0733
Sale             120                   24.1740
Sale             67                    Transfer
Sale             185                   23.9300
Sale             196                   23.8000


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          145288        23.7891
CFD            Long          42718         23.8181
CFD            Long          9989          23.8401
CFD            Long          9756          23.8965
CFD            Long          19050         23.8972
CFD            Long          102641        23.9195
CFD            Long          300           24.0733
CFD            Long          12710         24.1663
CFD            Long          97487         24.1711
CFD            Long          600           24.49
CFD            Short         6248          23.5107
CFD            Short         9830          23.7734
CFD            Short         9489          23.8153
CFD            Short         941           23.89
CFD            Short         39828         23.9224
CFD            Short         1650          23.984
CFD            Short         300           24.0733
CFD            Short         102142        24.0741
CFD            Short         7612          24.3209
CFD            Short         7400          24.4454
CFD            Short         40890         24.4672
CFD            Short         16000         25.0065


(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             Purchase          18                 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                         23 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   -95                    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