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               01 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      45,618,490      4.57%     2,416,527      0.24%
securities
(2) Derivatives    3,146,151      0.32%        51,251      0.01%
(other than
options)
(3) Options and      141,450      0.01%       100,560      0.01%
agreements to
purchase/sell
Total             48,906,091      4.90%     2,568,608      0.26%


(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      6,134                 51.9116
Purchase      138                   51.5079
Purchase      1,502                 51.3065
Purchase      356                   51.3500
Purchase      516                   51.3065
Purchase      20,745                52.3300
Purchase      1,911                 52.3300
Purchase      3,424                 Transfer
Purchase      121                   50.9600
Purchase      265                   51.4112
Purchase      40                    51.2500
Purchase      4,269                 52.3442
Purchase      12,101                51.2588
Purchase      1,151                 51.2445
Purchase      35,317                51.3143
Purchase      100                   51.4272
Purchase      1,596                 52.3300
Purchase      36,000                50.9391
Purchase      78                    51.5079
Purchase      94                    51.3900
Purchase      3,216                 52.3300
Purchase      819                   51.5651
Purchase      562                   51.3065
Purchase      308                   51.3065
Purchase      23,356                52.2427
Purchase      443                   51.3065
Purchase      435                   51.3065
Purchase      364                   51.3065
Purchase      325                   51.3065
Purchase      5,560                 52.3300
Purchase      1,112                 52.3300
Sale          170                   51.2000
Sale          135                   51.0800
Sale          250                   51.1200
Sale          150,532               51.1758
Sale          300                   51.2100
Sale          120                   51.0800
Sale          65                    50.9425
Sale          160                   51.5500
Sale          185                   51.3600
Sale          2,230                 52.3300
Sale          4,337                 51.5337
Sale          65                    51.0800
Sale          50                    51.0800
Sale          36,000                50.9391
Sale          14,704                51.3939
Sale          400                   51.7600
Sale          7,500                 52.0070
Sale          16                    51.9324
Sale          130                   51.1612
Sale          90                    51.0556
Sale          179                   51.6200
Sale          36,000                50.9391
Sale          20                    50.8324
Sale          26                    51.8423
Sale          3,424                 Transfer
Sale          35                    51.0400
Sale          170                   51.3700
Sale          20                    52.1600
Sale          3,499                 51.5117
Sale          7,002                 52.1239
Sale          100                   65.0000 EUR
Sale          70                    51.0800
Sale          100                   51.6000
Sale          35                    51.1700
Sale          125                   52.0000
Sale          70                    51.0800
Sale          150                   51.2100
Sale          230                   51.3300
Sale          55                    51.3004
Sale          5,166                 52.3300
Sale          25                    51.1300
Sale          2,171                 50.9700
Sale          38,632                51.0765
Sale          25                    51.9332
Sale          40,500                51.2360
Sale          25                    51.2000
Sale          42,532                51.8890
Sale          66                    51.1600
Sale          21,013                50.9428
Sale          83,400                52.3300
Sale          85                    51.0800
Sale          749                   51.4617
Sale          150                   51.4500
Sale          100                   51.4500
Sale          110                   52.2208
Sale          195                   52.3300
Sale          120                   51.0800
Sale          225                   51.2200
Sale          125                   51.2112
Sale          25                    51.4112
Sale          120                   51.8800
Sale          120                   51.8800
Sale          125                   51.0200
Sale          50                    51.5000
Sale          60                    51.7400
Sale          100                   51.0800
Sale          55                    51.0800
Sale          75                    51.8716
Sale          150                   51.0800


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          36000         50.939
CFD            Long          38632         51.0765
CFD            Long          150532        51.1758
CFD            Long          40500         51.236
CFD            Long          14704         51.3938
CFD            Long          519           51.4266
CFD            Long          4337          51.5337
CFD            Long          26            51.8423
CFD            Long          42532         51.889
CFD            Long          7500          52.007
CFD            Long          7002          52.1238
CFD            Short         35317         51.3142
CFD            Short         819           51.565
CFD            Short         6134          51.9115
CFD            Short         23356         52.2427
CFD            Short         4269          52.3442


(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                         02 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                 54.0000          AMER           18/04/2008
Option            Purchased   20,000                 52.0000          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                   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