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               23 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      46,596,675       4.67%      598,883      0.06%
securities
(2) Derivatives      786,010       0.08%    1,755,917      0.18%
(other than
options)
(3) Options and      101,200       0.01%      151,400      0.02%
agreements to
purchase/sell
Total             47,483,885       4.76%    2,506,200      0.25%


(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         20                    40.4055
Purchase         1,253                 40.4554
Purchase         41,901                42.4000
Purchase         22,278                40.3072
Purchase         55,855                40.5564
Purchase         99                    Transfer
Purchase         12,209                40.3158
Purchase         713                   40.3934
Purchase         77,274                40.3950
Purchase         25,534                40.2797
Purchase         1,323                 40.4175
Purchase         390                   44.5628
Purchase         2,574                 40.1753
Purchase         39,000                40.2300
Purchase         3,826                 40.2598
Purchase         6,523                 42.4000
Purchase         271                   40.4149
Purchase         26,656                42.4000
Purchase         16,660                40.2300
Purchase         200                   40.3300
Sale             6,008                 40.4670
Sale             71                    Transfer
Sale             22,726                40.8139
Sale             200                   40.3300
Sale             41,901                42.4000
Sale             1,760                 40.4491
Sale             99                    Transfer
Sale             50,423                40.5489
Sale             1,200                 40.7047
Sale             77,274                40.3950
Sale             390                   44.5628
Sale             89                    42.0870
Sale             25,019                43.8379
Sale             777                   40.2300
Sale             3,429                 40.2300
Sale             77,274                40.3950
Sale             6,523                 42.4000
Sale             824                   42.4000
Sale             328                   40.4165
Sale             166                   40.4164
Sale             71                    41.3000
Sale             200                   39.9700
Sale             485                   Transfer
Sale             153                   40.5151
Sale             8,652                 40.5056
Sale             28,756                40.2300
Sale             10,313                40.4130
Sale             390                   40.0400
Sale             73,885                40.3683
Sale             16,900                40.5763
Sale             23,761                40.5828
Sale             6                     42.6300
Sale             5,602                 40.3317
Sale             816                   40.5151

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          200           40.33
CFD            Long          73885         40.3682
CFD            Long          10313         40.413
CFD            Long          1760          40.449
CFD            Long          6008          40.467
CFD            Long          8652          40.5055
CFD            Long          50423         40.5488
CFD            Long          16900         40.5763
CFD            Long          23761         40.5828
CFD            Long          1200          40.7047
CFD            Long          22726         40.8138
CFD            Long          25019         43.8379
CFD            Short         3826          40.2597
CFD            Short         25534         40.2797
CFD            Short         22278         40.3072
CFD            Short         12209         40.3158
CFD            Short         200           40.33
CFD            Short         20            40.4055
CFD            Short         55855         40.5563

(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                         24 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