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               15 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      45,815,043      4.59%     2,169,016      0.22%
securities
(2) Derivatives    2,999,703      0.30%        31,583      0.00%
(other than
options)
(3) Options and      141,450      0.01%       101,080      0.01%
agreements to
purchase/sell
Total             48,956,196      4.91%     2,301,679      0.23%


(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         3,288                 60.0700
Purchase         732                   59.7764
Purchase         113                   59.0200
Purchase         10,476                60.0700
Purchase         860                   60.0700
Purchase         1,600                 60.0355
Purchase         258                   58.9603
Purchase         99                    59.2500
Purchase         50                    58.4788
Purchase         3,400                 60.1118
Purchase         35,057                59.9756
Purchase         1,720                 58.9603
Purchase         7,777                 59.7055
Purchase         2,021                 58.9603
Purchase         194                   59.7456
Purchase         795                   59.7764
Purchase         900                   59.9870
Purchase         2,224                 60.0700
Purchase         3,693                 58.2200
Sale             150                   60.0236
Sale             125                   59.9930
Sale             2,200                 59.5088
Sale             99                    58.4200
Sale             18,594                60.0758
Sale             14,600                59.9397
Sale             7,202                 59.6661
Sale             575                   60.0100
Sale             5,92                  60.0137
Sale             2,187                 59.6345
Sale             90                    58.9620
Sale             170                   59.1148
Sale             106                   Transfer
Sale             800                   59.9843
Sale             9,996                 59.6052
Sale             172                   59.6266
Sale             250                   59.7220
Sale             160                   60.0616
Sale             175                   59.0224
Sale             192                   59.3070
Sale             60                    60.1945
Sale             135                   60.2815
Sale             42                    59.4640
Sale             50                    59.0040
Sale             400                   59.5610
Sale             368                   59.7705
Sale             307                   59.7705
Sale             85                    58.7391
Sale             765                   58.8200
Sale             50                    60.1200
Sale             189                   59.7705
Sale             200                   58.8050
Sale             1,882                 59.7705
Sale             165                   59.0232
Sale             80                    60.1945
Sale             860                   60.0700
Sale             500                   58.9330
Sale             80                    60.1945
Sale             446                   60.0700
Sale             210                   59.7140
Sale             62                    59.2916
Sale             455                   59.8830


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          2200          59.5088
CFD            Long          9996          59.6052
CFD            Long          7202          59.666
CFD            Long          14600         59.9397
CFD            Long          800           59.9843
CFD            Long          5928          60.0136
CFD            Long          18594         60.0758
CFD            Short         50            58.4788
CFD            Short         7777          59.7054
CFD            Short         194           59.7456
CFD            Short         35057         59.9755
CFD            Short         900           59.987
CFD            Short         1600          60.0354
CFD            Short         3400          60.1117


(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                         16 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