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 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      46,749,121       4.67%    1,268,940      0.13%
securities
(2) Derivatives      777,446       0.08%    1,868,278      0.19%
(other than
options)
(3) Options and      101,200       0.01%      151,400      0.02%
agreements to
purchase/sell
Total             47,627,767       4.75%    3,288,618      0.33%


(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         277                   41.6800
Purchase         1,418                 41.6800
Purchase         713                   42.5900
Purchase         126                   Transfer
Purchase         15,083                42.4000
Purchase         1,475                 41.6800
Purchase         27                    Transfer
Purchase         7,322                 42.6111
Purchase         54                    42.8943
Purchase         232                   42.7400
Purchase         32,000                40.0000
Purchase         10,032                43.4564
Purchase         57                    Transfer
Purchase         8,000                 40.0000
Purchase         41,000                42.5688
Purchase         392                   42.4000
Purchase         47                    Transfer
Purchase         34,704                43.4564
Purchase         526                   40.5893
Purchase         14,258                43.4564
Purchase         26,392                41.0867
Purchase         49,372                42.7534
Purchase         514                   42.8574
Purchase         99                    42.8574
Purchase         119,119               41.6800
Purchase         4,045                 42.4101
Purchase         413                   40.5893
Purchase         20                    55.7300 EUR
Purchase         9,812                 42.4000
Purchase         9,693                 42.7334
Purchase         272                   42.6500
Purchase         2,975                 42.4000
Purchase         527                   43.3135
Purchase         41,901                42.4000
Purchase         1,126                 40.5893
Purchase         986                   43.2136
Sale             38                    42.6200
Sale             21,000                42.8093
Sale             526                   40.5893
Sale             931                   43.5600
Sale             57                    Transfer
Sale             15                    42.0631
Sale             4,392                 41.4025
Sale             29                    41.6100
Sale             105                   43.0930
Sale             67                    Transfer
Sale             51                    42.8940
Sale             47                    Transfer
Sale             803                   42.7536
Sale             1,429                 42.9422
Sale             277                   41.6800
Sale             1,126                 40.5893
Sale             28,715                42.7962
Sale             26                    39.5600
Sale             19,000                42.7070
Sale             111                   42.7688
Sale             500                   40.4850
Sale             1,149                 42.4000
Sale             75                    43.5500
Sale             17,871                42.4000
Sale             3,775                 42.4000
Sale             80                    42.8320
Sale             59,423                43.2851
Sale             355                   42.7600
Sale             218,917               42.9122
Sale             229                   42.7688
Sale             13,800                42.4000
Sale             9,812                 42.4000
Sale             15,083                42.4000
Sale             12,584                42.2500
Sale             35                    42.7300
Sale             2,016                 42.2500
Sale             77                    45.1263
Sale             126                   Transfer
Sale             44                    42.9650
Sale             45                    42.8910
Sale             40,000                40.0000
Sale             4,465                 42.7282
Sale             91                    Transfer
Sale             15,083                42.4000
Sale             3,992                 41.4025
Sale             2,700                 43.2056
Sale             2,700                 43.2056
Sale             413                   40.5893
Sale             1,418                 42.1500
Sale             55,207                43.0801
Sale             2                     41.0000
Sale             1,418                 41.6800
Sale             112                   Transfer
Sale             27                    Transfer

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          15            42.0633
CFD            Long          4465          42.7281
CFD            Long          28715         42.7961
CFD            Long          21000         42.8092
CFD            Long          218917        42.9121
CFD            Long          1429          42.9421
CFD            Long          55207         43.08
CFD            Long          59423         43.2851
CFD            Long          1135          43.3332
CFD            Short         26392         41.0867
CFD            Short         4045          42.41
CFD            Short         41000         42.5688
CFD            Short         9693          42.7334
CFD            Short         49372         42.7534
CFD            Short         54            42.8942

(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                         23 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   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   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   -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   -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