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               09 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      47,602,948      4.77%       344,834      0.03%
securities
(2) Derivatives      581,329      0.06%     1,789,106      0.18%
(other than
options)
(3) Options and      101,200      0.01%       276,998      0.03%
agreements to
purchase/sell
Total             48,285,477      4.84%     2,410,938      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         1,159                 27.7996
Purchase         725                   28.0000
Purchase         5,236                 27.8692
Purchase         890                   27.0796
Purchase         35,817                27.9884
Purchase         29,453                27.7705
Purchase         200                   28.1000
Purchase         4,189                 27.5000
Purchase         725                   28.0000
Purchase         3,766                 27.8842
Purchase         100                   28.0000
Purchase         66,797                27.4887
Purchase         8,806                 28.2552
Purchase         12,570                28.1900
Purchase         36,125                28.3225
Purchase         70                    28.2400
Purchase         2,501                 27.8577
Purchase         400                   28.1800
Purchase         603                   27.8783
Purchase         1,149                 27.5000
Purchase         3,328                 27.5000
Purchase         520                   28.2581
Purchase         115                   27.7536
Purchase         27,990                27.5000
Purchase         87                    27.5000
Purchase         715                   28.2466
Purchase         151                   27.8200
Purchase         1,133                 27.5000
Purchase         3,966                 28.0103
Purchase         4,160                 27.5000
Purchase         2,284                 27.5000
Purchase         41,600                27.5000
Purchase         4,324                 28.4500
Purchase         11,554                27.0100
Purchase         1,626                 28.1005
Purchase         456                   28.2491
Purchase         50                    35.2000 EUR
Purchase         2,000                 27.9536
Purchase         12,480                28.2000
Sale             1,653                 28.1014
Sale             1,000                 27.2459
Sale             88                    Transfer
Sale             190                   Transfer
Sale             400                   28.1800
Sale             1,000                 29.0862
Sale             3,201                 27.7513
Sale             20,985                27.4008
Sale             927                   28.3525
Sale             64,726                27.6854
Sale             29,228                27.8155
Sale             11,624                27.6085
Sale             330                   27.2000
Sale             3,308                 27.5000
Sale             1,805                 27.5000
Sale             12,570                28.1900
Sale             67                    27.2200
Sale             5,580                 28.3979
Sale             10,000                28.3805
Sale             12,480                28.3411
Sale             8,071                 27.7027
Sale             24,848                27.7105
Sale             1,159                 27.7996
Sale             36,262                27.9819
Sale             6,002                 28.1262
Sale             61,203                27.5000

NB: The below transactions which were previously disclosed have been cancelled
Deal Date    Purchase/Sale    Number of Securities    Price per unit (GBP)
09/10/2008   Purchase         725                     28.0000

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          1000          27.2459
CFD            Long          20985         27.4007
CFD            Long          64726         27.6854
CFD            Long          24848         27.7104
CFD            Long          3201          27.7512
CFD            Long          29228         27.8154
CFD            Long          36262         27.9818
CFD            Long          1653          28.1013
CFD            Long          6002          28.1262
CFD            Long          400           28.18
CFD            Long          927           28.3525
CFD            Long          1000          29.0862
CFD            Short         35            0
CFD            Short         890           27.0795
CFD            Short         66797         27.4886
CFD            Short         115           27.7535
CFD            Short         2945          3 27.7705
CFD            Short         1159          27.7995
CFD            Short         5236          27.8691
CFD            Short         603           27.8783
CFD            Short         3766          27.8842
CFD            Short         35817         27.9883
CFD            Short         3966          28.0103
CFD            Short         400           28.18
CFD            Short         8806          28.2551
CFD            Short         520           28.258
CFD            Short         36125         28.3225
CFD            Short         3545          28.5982

(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                         10 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