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               03 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      45,663,093      4.58%     2,367,096      0.24%
securities
(2) Derivatives    3,071,253      0.31%        47,885      0.00%
(other than
options)
(3) Options and      141,450      0.01%       100,830      0.01%
agreements to
purchase/sell
Total             48,875,796      4.90%     2,515,811      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      15,000                54.1253
Purchase      1,118                 54.4200
Purchase      577                   54.4658
Purchase      17,500                54.1808
Purchase      1,600                 54.2866
Purchase      25                    54.0672
Purchase      7,055                 54.2448
Purchase      2,075                 54.2141
Purchase      4,639                 54.1014
Purchase      180                   54.1200
Purchase      361                   53.9556
Purchase      524                   53.9495
Purchase      100                   69.6700 EUR
Purchase      198                   54.4167
Purchase      524                   52.4177
Purchase      2,975                 54.4200
Purchase      167                   54.3900
Purchase      21,798                54.4167
Purchase      1,113                 54.4200
Purchase      2,226                 54.4200
Purchase      100                   69.5600 EUR
Sale          3,051                 54.3868
Sale          15,000                54.4200
Sale          150                   53.9500
Sale          140                   54.0232
Sale          85                    53.7720
Sale          85                    54.5400
Sale          175                   54.0348
Sale          66                    54.4417
Sale          50,258                54.2552
Sale          200                   54.2900
Sale          185                   54.0400
Sale          100                   53.9724
Sale          17,460                54.3069
Sale          524                   52.4177
Sale          56,998                54.2306
Sale          51                    53.9900
Sale          11,398                54.1899
Sale          5,599                 54.3781
Sale          90                    54.1416
Sale          40                    54.2215
Sale          5,401                 54.0288
Sale          500                   52.3990
Sale          500                   52.3990
Sale          238                   54.3900
Sale          167                   54.3600
Sale          58                    54.3300
Sale          115                   54.4700
Sale          115                   54.2300
Sale          204                   54.4600
Sale          150                   54.0400
Sale          110                   54.4300
Sale          120                   54.0200
Sale          50                    54.4300
Sale          175                   53.9300
Sale          522                   54.4200
Sale          75                    54.2700
Sale          743                   53.9059
Sale          75                    54.2900
Sale          473                   54.4200
Sale          110                   54.2900
Sale          150                   53.9000
Sale          70                    54.5300
Sale          150                   53.9224
Sale          2,315                 54.4083
Sale          48                    53.8121
Sale          175                   53.8024
Sale          175                   53.7900
Sale          190                   54.1400
Sale          100                   54.0500
Sale          110                   54.5300


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          743           53.9058
CFD            Long          11398         54.1898
CFD            Long          56998         54.2306
CFD            Long          50258         54.2551
CFD            Long          17460         54.3068
CFD            Long          5599          54.378
CFD            Long          3051          54.3867
CFD            Short         361           53.9556
CFD            Short         4639          54.1013
CFD            Short         15000         54.1252
CFD            Short         17500         54.1807
CFD            Short         2075          54.2141
CFD            Short         7055          54.2447
CFD            Short         1600          54.2866
CFD            Short         467           54.3737


(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                         04 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