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               10 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      45,883,805      4.60%     2,005,368      0.20%
securities
(2) Derivatives    2,836,269      0.28%        52,968      0.01%
(other than
options)
(3) Options and      141,450      0.01%       101,080      0.01%
agreements to
purchase/sell
Total             48,861,524     4.90%      2,159,416      0.22%


(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         6,688                 58.3301
Purchase         630                   58.2407
Purchase         380                   58.2087
Purchase         117                   58.2087
Purchase         301                   58.3216
Purchase         10,200                58.4810
Purchase         64,745                58.3334
Purchase         107,594               58.2037
Purchase         3,500                 58.1776
Purchase         24                    Transfer
Purchase         9,616                 58.3517
Purchase         25,182                60.0000
Purchase         5,627                 58.4605
Purchase         97,706                60.0000
Purchase         32                    Transfer
Purchase         11,181                59.0700
Purchase         17,082                58.4394
Purchase         34                    72.2000 EUR
Sale             21                    58.9332
Sale             6,508                 Transfer
Sale             800                   58.9697
Sale             10,634                59.0700
Sale             200                   58.1200
Sale             26                    58.0300
Sale             10,900                59.1700
Sale             94                    58.1600
Sale             110                   57.9020
Sale             164                   58.1600
Sale             6,451                 58.0900
Sale             475                   58.4500
Sale             200                   58.0400
Sale             175                   58.1200
Sale             54                    Transfer
Sale             8                     58.1720
Sale             253                   58.6000
Sale             28                    59.4500
Sale             12,386                58.3548
Sale             14,106                57.9635
Sale             415                   58.4500
Sale             24                    Transfer
Sale             200                   58.1200
Sale             32                    Transfer
Sale             200                   58.7700
Sale             2,591                 57.8950
Sale             863                   57.8950
Sale             900                   58.6215
Sale             2,151                 58.0900
Sale             25,182                60.0000
Sale             1,100                 59.0200
Sale             200                   58.1200
Sale             400                   58.1600
Sale             160                   58.1200
Sale             600                   58.1200
Sale             200                   58.1200
Sale             210                   58.1600
Sale             50                    57.9520
Sale             890                   58.1600
Sale             370                   58.1600
Sale             150                   58.7124
Sale             100                   58.1200
Sale             1,024                 59.1700
Sale             335                   58.1600
Sale             175                   58.1600
Sale             225                   58.1600
Sale             210                   58.1600
Sale             250                   58.0400
Sale             97,706                60.0000
Sale             1,334                 57.9825
Sale             97,706                60.0000
Sale             200                   58.1600
Sale             171                   58.3168
Sale             800                   59.1202
Sale             130                   58.1600
Sale             75                    58.1600
Sale             100                   58.1600
Sale             187                   58.1600
Sale             4,369                 58.3168
Sale             1,673                 58.3168
Sale             264                   58.3168
Sale             40                    58.0925
Sale             134                   59.0700
Sale             300                   58.1600
Sale             1,300                 58.9100
Sale             228                   58.3168
Sale             147                   58.3168
Sale             50                    58.8612
Sale             200                   58.0400
Sale             213                   58.3168
Sale             100                   59.1000
Sale             250                   58.1200
Sale             200                   58.1200
Sale             185                   59.0700


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          14106         57.9634
CFD            Long          12386         58.3548
CFD            Long          900           58.6215
CFD            Long          800           58.9696
CFD            Long          1100          59.02
CFD            Long          800           59.1202
CFD            Short         3500          58.1776
CFD            Short         107594        58.2036
CFD            Short         301           58.3215
CFD            Short         6688          58.3301
CFD            Short         64745         58.3333
CFD            Short         9616          58.3516
CFD            Short         17082         58.4393
CFD            Short         5627          58.4604
CFD            Short         10200         58.4809


(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                         11 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   20,000                 52.0000          AMER           18/04/2008
Option            Purchased   20,000                 54.0000          AMER           18/04/2008
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   -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