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               29 May 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      46,730,858      4.68%     1,009,544      0.10%
securities
(2) Derivatives    2,806,006      0.28%       177,855      0.02%
(other than
options)
(3) Options and      101,461      0.01%       341,080      0.03%
agreements to
purchase/sell
Total             49,638,325      4.97%     1,528,479      0.15%


(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         652                   61.9329
Purchase         168                   61.8000
Purchase         7,301                 61.9339
Purchase         4,108                 62.4860
Purchase         4,700                 61.7800
Purchase         20,904                62.6193
Purchase         11,300                62.0218
Purchase         61                    61.9000
Purchase         6,690                 62.0423
Purchase         3,026                 62.5757
Purchase         2,840                 61.9947
Sale             322                   61.6633
Sale             479                   61.6633
Sale             113                   63.1197
Sale             1,106                 61.6633
Sale             6,939                 61.6633
Sale             100                   61.2216
Sale             85                    62.2900
Sale             18,447                61.6633
Sale             2,691                 61.6633
Sale             1,360                 62.8332
Sale             4,399                 62.8332
Sale             719                   61.6633
Sale             80                    63.3000
Sale             117                   Transfer
Sale             210                   63.2500
Sale             21                    62.0300
Sale             150                   62.5975
Sale             6,000                 61.8000
Sale             51,274                61.3888
Sale             567                   61.6633
Sale             19,626                61.9877
Sale             20,177                61.5451
Sale             30                    62.0545
Sale             9,401                 61.9377
Sale             7,378                 62.1260
Sale             7,352                 61.6605
Sale             29                    61.9800
Sale             83                    Transfer
Sale             250                   63.2300
Sale             1,421                 63.1197
Sale             739                   61.6633
Sale             408                   63.1197
Sale             44                    63.1197
Sale             1,304                 63.0376
Sale             1,076                 62.8000
Sale             103                   62.8000
Sale             27,099                62.8332
Sale             330                   63.1197
Sale             664                   63.1197
Sale             1,840                 63.1197
Sale             720                   61.6633
Sale             296                   63.1197
Sale             648                   63.1197
Sale             816                   63.1197
Sale             265                   63.1197
Sale             58                    63.1197
Sale             766                   63.1197
Sale             2,886                 62.8332
Sale             826                   62.6218
Sale             347                   63.1197
Sale             974                   61.6633
Sale             112                   61.6633
Sale             2,630                 61.6633
Sale             1,863                 61.6633
Sale             210                   61.6633
Sale             150                   61.9300
Sale             3,507                 63.1197
Sale             125                   61.9500
Sale             2,158                 62.8332
Sale             542                   61.6633
Sale             7,317                 62.8332
Sale             3,913                 62.8332
Sale             6,962                 62.8332
Sale             2,763                 62.8332
Sale             15,225                62.8332
Sale             4,779                 62.8332
Sale             30                    63.2300

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          51274         61.3888
CFD            Long          20177         61.545
CFD            Long          7352          61.6605
CFD            Long          2680          61.8124
CFD            Long          9401          61.9377
CFD            Long          19626         61.9876
CFD            Long          7378          62.126
CFD            Long          259           63.0291
CFD            Short         652           61.9328
CFD            Short         7301          61.9338
CFD            Short         2840          61.9946
CFD            Short         11300         62.0218
CFD            Short         6690          62.0423
CFD            Short         4108          62.486
CFD            Short         3026          62.5757
CFD            Short         670           62.603
CFD            Short         20904         62.6192
CFD            Short         3214          62.6218

(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                         30 May 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   -135                   5,200.0000       EURO           19/12/2008
Option            Purchased   -100,000               30.0000          AMER           20/06/2008
Option            Purchased   -38,000                70.0000          AMER           20/06/2008
Option            Purchased   -10,000                74.0000          AMER           20/06/2008
Option            Purchased   -2,000                 70.0000          AMER           20/06/2008
Option            Purchased   -300                   3,800.0000       EURO           20/06/2008
Option            Purchased   -250                   5,200.0000       EURO           19/09/2008
Option            Purchased   -190,000               74.0000          AMER           20/06/2008
Option            Purchased   -145                   5,200.0000       EURO           19/12/2008
Option            Purchased   100,000                56.0000          AMER           18/12/2009
Option            Purchased   11                     7,600.0000       EURO           20/06/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   250                    3,800.0000       EURO           20/06/2008
Option            Purchased   250                    3,000.0000       EURO           20/06/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   -250                   2,500.0000       EURO           20/06/2008

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