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               07 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      46,924,985      4.70%     1,098,613      0.11%
securities
(2) Derivatives    2,823,668      0.28%        58,270      0.01%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,850,103      5.00%     1,297,963      0.13%


(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         609                   63.5900
Purchase         1,278                 63.5651
Purchase         120                   63.5900
Purchase         115                   63.5900
Purchase         1,157                 63.6954
Purchase         2,380                 63.6954
Purchase         63                    63.7800
Purchase         92,000                64.8081
Purchase         632                   63.6390
Purchase         84                    63.5900
Purchase         1,966                 63.5900
Purchase         13,124                63.5900
Purchase         235                   63.9409
Purchase         492                   63.5900
Purchase         239                   63.5900
Purchase         6,236                 63.5934
Purchase         1,736                 63.8828
Purchase         14,529                63.3964
Purchase         11                    Transfer
Purchase         8,742                 63.8438
Purchase         160,000               63.1437
Purchase         3,537                 62.5682
Purchase         46                    Transfer
Purchase         11,050                63.9255
Purchase         714                   63.7401
Sale             41                    63.4145
Sale             15                    62.8815
Sale             45                    63.8431
Sale             32                    62.9575
Sale             40                    62.7860
Sale             70                    63.5300
Sale             12,507                63.6897
Sale             46                    Transfer
Sale             2,313                 63.8768
Sale             8,723                 63.7552
Sale             21,100                63.6074
Sale             400                   63.9849
Sale             120                   62.8545
Sale             41                    63.8100
Sale             63                    63.8200
Sale             70                    63.4976
Sale             254                   64.2800
Sale             104,262               63.3887
Sale             112                   63.7800
Sale             41                    63.5060
Sale             92                    Transfer
Sale             41                    63.9630
Sale             29                    63.8975
Sale             316                   Transfer
Sale             123                   63.0200
Sale             47                    63.5545
Sale             190                   63.5945
Sale             36,955                63.5724
Sale             13                    80.1800 EUR
Sale             100                   63.0200
Sale             3,500                 63.8600
Sale             200                   64.3230
Sale             4,000                 64.0117
Sale             40                    62.9060
Sale             80                    63.5900
Sale             525                   63.0900



(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          104262        63.3887
CFD            Long          36955         63.5723
CFD            Long          21100         63.6074
CFD            Long          12507         63.6896
CFD            Long          2313          63.8768
CFD            Long          400           63.9848
CFD            Long          254           64.28
CFD            Short         3537          62.5681
CFD            Short         14529         63.3963
CFD            Short         6236          63.5934
CFD            Short         8742          63.8438
CFD            Short         1736          63.8827



(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                         08 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   100,000                56.0000          AMER           18/12/2009
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   250                    3,000.0000       EURO           20/06/2008
Option            Purchased   250                    3,800.0000       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   -135                   5,200.0000       EURO           19/12/2008
Option            Purchased   -145                   5,200.0000       EURO           19/12/2008
Option            Purchased   -250                   5,200.0000       EURO           19/09/2008
Option            Purchased   -250                   2,500.0000       EURO           20/06/2008
Option            Purchased   -300                   3,800.0000       EURO           20/06/2008
Option            Purchased   -2,000                 70.0000          AMER           20/06/2008
Option            Purchased   -38,000                70.0000          AMER           20/06/2008
Option            Purchased   -100,000               30.0000          AMER           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