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               30 April 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      46,432,241      4.65%     1,656,808      0.17%
securities
(2) Derivatives    2,984,361      0.30%       174,614      0.02%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,518,052      4.96%     1,972,502      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         3,410                 59.3456
Purchase         6,300                 58.8471
Purchase         225                   59.4113
Purchase         3,577                 58.2770
Purchase         426                   59.1100
Purchase         16,556                58.8101
Purchase         85,306                59.2100
Purchase         31                    Transfer
Purchase         3,535                 59.1100
Purchase         30,061                59.1100
Purchase         6,042                 59.1100
Purchase         255                   59.1100
Purchase         3,577                 58.2770
Purchase         249                   58.8200
Purchase         92,589                58.9173
Purchase         85                    59.0525
Purchase         1,635                 59.1100
Purchase         426                   59.2569
Purchase         2,000                 59.2409
Purchase         80                    58.6470
Purchase         80,000                59.4364
Purchase         85                    59.5800
Purchase         1,500                 58.7729
Purchase         55,716                58.9605
Purchase         1,881                 58.9568
Sale             3,491                 58.6077
Sale             31                    Transfer
Sale             100                   59.2902
Sale             3,577                 58.2785
Sale             123                   Transfer
Sale             5,161                 58.6077
Sale             4,500                 59.2420
Sale             10,017                59.1150
Sale             54                    59.2630
Sale             11,645                58.6077
Sale             11,011                59.1100
Sale             16,916                59.1365
Sale             45                    59.0616
Sale             466                   59.7900
Sale             7,348                 58.2920
Sale             4,895                 59.1100
Sale             100                   59.3324
Sale             170                   58.7090
Sale             450                   59.2660
Sale             23,435                59.1100
Sale             668                   59.1100
Sale             849                   59.1100
Sale             344                   59.1100
Sale             761                   59.1100
Sale             65                    58.5728
Sale             100                   59.0615
Sale             22                    58.4200
Sale             4,968                 59.1100
Sale             507                   59.1100
Sale             3,270                 59.1100
Sale             100                   59.1300
Sale             953                   59.1100
Sale             2,615                 59.1100
Sale             130                   58.9200
Sale             200                   58.7712
Sale             50                    59.3416
Sale             75                    58.6091
Sale             17                    59.4132
Sale             1,268                 59.1100



(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          10017         59.115
CFD            Long          16916         59.1365
CFD            Long          4500          59.242
CFD            Long          100           59.2902
CFD            Short         3577          58.277
CFD            Short         1500          58.7729
CFD            Short         16556         58.8101
CFD            Short         6300          58.8471
CFD            Short         92589         58.9172
CFD            Short         1881          58.9568
CFD            Short         55716         58.9604
CFD            Short         2000          59.2408
CFD            Short         3410          59.3455
CFD            Short         225           59.4112


(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                         01 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   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
Option            Purchased   100,000                56.0000          AMER 18/12/2009
Option            Purchased   350                    4,600.0000       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