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               02 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      46,493,572      4.66%     1,627,768      0.16%
securities
(2) Derivatives    2,955,321      0.30%       182,420      0.02%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,550,343      4.97%     1,951,268      0.20%


(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         100,000               60.9369
Purchase         100,000               58.3540
Purchase         6,944                 59.0196
Purchase         16,032                58.9851
Purchase         15,778                61.0600
Purchase         1,085                 61.0600
Purchase         10,697                60.2890
Purchase         2,008                 61.0600
Purchase         26,227                58.9806
Purchase         39,560                59.1376
Purchase         40                    78.8240 EUR
Sale             129,428               60.3724
Sale             100                   60.9300
Sale             30                    59.3400
Sale             75                    59.0500
Sale             50                    60.3600
Sale             100                   59.0500
Sale             170                   59.0500
Sale             1,400                 60.4393
Sale             12,000                60.3542
Sale             53                    58.9600
Sale             82                    59.1475
Sale             100                   59.0500
Sale             150                   59.2775
Sale             648                   59.0300
Sale             7,904                 60.9516
Sale             4,300                 60.1127
Sale             1,700                 58.9829
Sale             3,800                 60.3759
Sale             100                   60.2000
Sale             18,291                59.1100
Sale             5,510                 58.8889
Sale             11,360                60.7366
Sale             110                   59.1130
Sale             100                   59.0500
Sale             50                    59.3400
Sale             140                   59.1560
Sale             100                   59.8400
Sale             500                   59.0500
Sale             50                    59.0500
Sale             100                   59.5100
Sale             287                   59.1400
Sale             9,353                 60.8113
Sale             52                    59.3460
Sale             180                   59.1390
Sale             45                    59.1391
Sale             350                   60.9300
Sale             175                   59.0900
Sale             20,742                61.0600
Sale             100                   59.3400
Sale             50                    59.3400
Sale             2,077                 58.9600
Sale             25,000                59.2500
Sale             50                    59.0500

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          4300          60.1127
CFD            Long          12000         60.3541
CFD            Long          129428        60.3723
CFD            Long          3800          60.3759
CFD            Long          1400          60.4393
CFD            Long          9353          60.8113
CFD            Long          7904          60.9516
CFD            Short         100000        58.354
CFD            Short         26227         58.9806
CFD            Short         16032         58.985
CFD            Short         6944          59.0195
CFD            Short         39560         59.1376
CFD            Short         10697         60.289
CFD            Short         100000        60.9368

(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                         06 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                    3,800.0000       EURO           20/06/2008
Option            Purchased   250                    3,000.0000       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