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               04 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      45,708,470      4.58%     2,320,560      0.23%
securities
(2) Derivatives    3,109,378      0.31%        46,515      0.00%
(other than
options)
(3) Options and      141,450      0.01%       100,830      0.01%
agreements to
purchase/sell
Total             48,959,298      4.91%     2,468,155      0.25%


(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      876                   55.6915
Purchase      126,730               55.7800
Purchase      93                    Transfer
Purchase      52,781                56.0452
Purchase      425                   56.4578
Purchase      8,669                 55.7687
Purchase      2,300                 54.3200
Purchase      2,000                 55.8684
Purchase      1,402                 54.6586
Purchase      723                   55.5100
Purchase      10,062                56.9400
Purchase      2,044                 55.1500
Purchase      13                    55.3800
Purchase      4,436                 56.9400
Purchase      17,955                55.7211
Purchase      462                   55.6915
Purchase      31                    69.9800 EUR
Purchase      60                    70.0500 EUR
Purchase      60                    70.9600 EUR
Purchase      5,100                 55.7941
Purchase      40                    69.8500 EUR
Purchase      84,486                55.4300
Purchase      2,083                 54.6586
Purchase      3,665                 54.6586
Purchase      653                   55.8699
Sale          15,05                 56.9400
Sale          2,044                 55.1500
Sale          10,000                56.9292
Sale          1,468                 Transfer
Sale          47                    55.3400
Sale          82,500                55.5500
Sale          31,702                55.3861
Sale          51                    54.8936
Sale          50                    55.3600
Sale          6,594                 56.9315
Sale          9,579                 55.1055
Sale          123                   55.5716
Sale          1,370                 55.7314
Sale          50                    55.6012
Sale          24                    55.3720
Sale          2,400                 55.9216
Sale          5,939                 55.5488
Sale          800                   6.5447
Sale          132                   54.5900
Sale          112                   55.6700
Sale          2,044                 55.1700
Sale          50                    55.4024
Sale          230                   55.8600
Sale          100                   55.3800
Sale          80                    55.4348
Sale          90                    55.8400
Sale          60                    55.6900
Sale          50                    54.6100
Sale          70                    55.3800
Sale          80                    55.6113
Sale          206                   55.7700
Sale          60                    54.7700
Sale          182                   55.3800
Sale          446                   56.2700
Sale          54                    55.7300
Sale          100                   55.9232
Sale          841                   55.7700
Sale          60                    55.4120
Sale          569                   55.7700
Sale          150                   56.2900
Sale          29,000                56.9400
Sale          225                   55.2700
Sale          70                    54.7700
Sale          115                   55.8824
Sale          165                   55.3800
Sale          686                   55.7700
Sale          150                   55.5708
Sale          38                    55.3300
Sale          60                    55.7200
Sale          130                   56.2600
Sale          4,345                 55.7700
Sale          1,230                 55.7700
Sale          341                   55.7700
Sale          300                   55.0300
Sale          67,195                55.5933
Sale          250                   55.3800


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          31702         55.386
CFD            Long          5939          55.5487
CFD            Long          67195         55.5932
CFD            Long          1370          55.7314
CFD            Long          2400          55.9215
CFD            Long          800           56.5447
CFD            Long          10000         56.9291
CFD            Long          6594          56.9314
CFD            Short         17955         55.7211
CFD            Short         8669          55.7687
CFD            Short         5100          55.7941
CFD            Short         2000          55.8683
CFD            Short         52781         56.0452


(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                         07 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