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               11 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      46,614,513       4.67%      712,498      0.07%
securities
(2) Derivatives      590,249       0.06%    1,955,196      0.20%
(other than
options)
(3) Options and      101,200       0.01%      101,400      0.01%
agreements to
purchase/sell
Total             47,305,962       4.74%    2,819,094      0.28%


(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         35,958                41.4427
Purchase         6,071                 41.6277
Purchase         3,000                 42.0280
Purchase         16,500                42.6500
Purchase         4,794                 41.8961
Purchase         47                    Transfer
Purchase         7,500                 40.9200
Purchase         45,074                41.5741
Purchase         1,981                 42.5264
Purchase         8,429                 42.1754
Purchase         8,600                 40.9200
Purchase         2,500                 40.9968
Purchase         2,500                 41.9500
Purchase         22,187                41.5646
Purchase         49,690                41.6734
Purchase         10,000                41.3992
Purchase         20,500                44.1713
Purchase         117,154               41.1148
Purchase         2,400                 42.0280
Purchase         272                   42.4516
Purchase         13                    52.0100 EUR
Purchase         120                   41.8468
Purchase         2,271                 42.0000
Purchase         588                   41.6531
Purchase         435                   41.5800
Purchase         250                   40.3800
Purchase         644                   42.4516
Purchase         878                   42.4855
Purchase         161                   41.6900
Sale             25                    42.2930
Sale             2,339                 41.5350
Sale             10,000                41.8817
Sale             9,257                 41.5800
Sale             241                   41.2540
Sale             7,500                 42.1416
Sale             88                    42.4948
Sale             4,500                 40.5617
Sale             50                    52.0700 EUR
Sale             45,451                41.2229
Sale             2,200                 40.7342
Sale             5,056                 41.3379
Sale             11,500                42.5526
Sale             18,103                41.7672
Sale             13,586                41.2155
Sale             155                   40.8840
Sale             1,600                 40.5613
Sale             54                    42.2700
Sale             30,400                41.6500
Sale             3,344                 41.5800
Sale             5,352                 41.5800
Sale             33                    42.5336
Sale             600                   41.9300
Sale             47                    Transfer
Sale             217                   Transfer
Sale             100                   41.6628

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          1600          40.5613
CFD            Long          4500          40.5616
CFD            Long          2200          40.7342
CFD            Long          13586         41.2154
CFD            Long          45451         41.2229
CFD            Long          5056          41.3378
CFD            Long          17189         41.4533
CFD            Long          3276          41.5884
CFD            Long          30400         41.65
CFD            Long          32386         41.6656
CFD            Long          18103         41.7671
CFD            Long          10000         41.8817
CFD            Long          8087          42.0273
CFD            Long          11500         42.5526
CFD            Short         16100         40.92
CFD            Short         2500          40.9968
CFD            Short         117154        41.1147
CFD            Short         10000         41.3992
CFD            Short         35958         41.4426
CFD            Short         22187         41.5645
CFD            Short         45074         41.574
CFD            Short         6071          41.6277
CFD            Short         49690         41.6734
CFD            Short         8429          42.1753
CFD            Short         878           42.4855
CFD            Short         1981          42.5263

(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            Purchase          50,000             64        AMER            21/11/2008  0.178

(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                         12 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   -150                   7,000.0000       EURO           19/12/2008
Option            Purchased   -270                   6,400.0000       EURO           19/12/2008
Option            Purchased   -350                   7,000.0000       EURO           19/12/2008
Option            Purchased   -350                   5,000.0000       EURO           19/12/2008
Option            Purchased   350                    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   150                    5,000.0000       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