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 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      46,157,191      4.63%     1,779,884      0.18%
securities
(2) Derivatives    3,027,437      0.30%        65,469      0.01%
(other than
options)
(3) Options and      101,450      0.01%       101,080      0.01%
agreements to
purchase/sell
Total             49,286,078      4.94%     1,986,433      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         6,370                 60.7754
Purchase         266                   60.2401
Purchase         100                   59.7396
Purchase         221                   60.2416
Purchase         318                   60.2368
Purchase         166                   60.2275
Purchase         259                   60.2386
Purchase         3,137                 60.1000
Purchase         4,020                 60.2788
Purchase         451                   61.3256
Purchase         377                   60.2505
Purchase         250                   59.6500
Purchase         484                   61.3424
Purchase         1,541                 60.2794
Purchase         700                   60.2500
Purchase         712                   60.2603
Purchase         800                   60.1677
Purchase         160                   61.3256
Purchase         2,000                 60.4397
Purchase         26,072                60.4008
Purchase         7,524                 60.4966
Purchase         291                   60.5300
Purchase         62,408                60.5859
Purchase         17,562                60.6769
Purchase         798                   60.2368
Purchase         1,231                 60.2368
Purchase         2,137                 60.1000
Purchase         329                   60.2368
Purchase         2,183                 60.2368
Purchase         1,437                 60.1000
Purchase         63                    62.2600
Purchase         434                   60.1000
Purchase         716                   60.2368
Purchase         782                   60.1000
Purchase         220                   60.2368
Purchase         1,779                 60.2368
Purchase         394                   60.2368
Purchase         386                   60.2661
Purchase         448                   60.2887
Purchase         65                    60.7240
Purchase         904                   60.2822
Sale             451                   61.3256
Sale             20                    60.4360
Sale             5                     60.1100
Sale             20,512                60.2136
Sale             14,086                60.4735
Sale             125                   60.7090
Sale             75                    60.8932
Sale             250                   60.4660
Sale             126                   60.1000
Sale             1,300                 59.9503
Sale             50                    59.8232
Sale             2,400                 60.3709
Sale             150                   60.5408
Sale             50                    60.1900
Sale             32                    Transfer
Sale             6,041                 60.3310
Sale             4,700                 60.3516
Sale             100                   60.8932
Sale             160                   60.7115
Sale             100                   60.2315
Sale             150                   59.7000
Sale             60                    60.7032
Sale             150                   60.1900
Sale             160                   61.3256
Sale             245                   59.7300
Sale             220                   60.2390
Sale             13,877                60.2136
Sale             400                   60.0000
Sale             200                   60.1890
Sale             900                   59.9412
Sale             1,309                 59.6960
Sale             3,800                 60.0543
Sale             46,282                60.2136
Sale             100                   60.2700
Sale             1,731                 60.3800



(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          1309          59.6959
CFD            Long          900           59.9412
CFD            Long          1300          59.9503
CFD            Long          3800          60.0543
CFD            Long          6041          60.331
CFD            Long          4700          60.3516
CFD            Long          2400          60.3709
CFD            Long          14086         60.4735
CFD            Short         800           60.1676
CFD            Short         700           60.25
CFD            Short         712           60.2602
CFD            Short         26072         60.4007
CFD            Short         2000          60.4396
CFD            Short         7524          60.4966
CFD            Short         62408         60.5858
CFD            Short         17562         60.6769
CFD            Short         6370          60.7754


(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 April 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