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               07 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      45,699,548      4.58%     2,303,713      0.23%
securities
(2) Derivatives    3,102,653      0.31%        44,308      0.00%
(other than
options)
(3) Options and      141,450      0.01%       101,080      0.01%
agreements to
purchase/sell
Total             48,943,651      4.90%      2,449,101     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      27,161                58.0842
Purchase      404                   58.4000
Purchase      415                   54.9439
Purchase      2,177                 58.4602
Purchase      353                   58.4196
Purchase      1,225                 57.9002
Purchase      6,594                 57.9440
Purchase      55,065                58.3682
Purchase      21,122                58.4500
Purchase      77,727                58.2446
Purchase      5,378                 .5779
Purchase      1,296                 58.3756
Purchase      2,604                 57.3803
Purchase      3,766                 58.4000
Purchase      15,120                58.4000
Purchase      953                   58.1258
Sale          129                   57.6616
Sale          134,654               57.7092
Sale          46                    56.2900
Sale          1,911                 57.5540
Sale          3,160                 58.2823
Sale          83                    55.6900
Sale          415                   54.9439
Sale          63                    58.3300
Sale          11,000                58.4000
Sale          3,240                 58.0128
Sale          42                    58.4000
Sale          180                   56.3000
Sale          167                   57.5300
Sale          280                   55.5400
Sale          196                   58.3000
Sale          90                    57.4700
Sale          64                    57.6400
Sale          150                   58.0500
Sale          4,609                 58.4000
Sale          165                   57.6500
Sale          50                    57.5700
Sale          100                   57.5848
Sale          620                   57.7400
Sale          100                   57.5400
Sale          100                   58.4116
Sale          150                   58.4600
Sale          50                    57.7100
Sale          600                   57.6600
Sale          150                   58.1000
Sale          33                    57.8100
Sale          150                   57.6900
Sale          30,000                57.6362
Sale          125                   57.7600
Sale          270                   57.6800
Sale          150                   57.6500
Sale          178                   57.6536
Sale          275                   58.1000
Sale          85                    58.3532
Sale          100                   57.6200
Sale          1,825                 58.4612
Sale          263                   57.5900
Sale          1,405                 57.6688
Sale          50                    57.8100
Sale          285                   58.4000

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          1911          57.554
CFD            Long          30000         57.6362
CFD            Long          134654        57.7091
CFD            Long          3240          58.0128
CFD            Long          3160          58.2823
CFD            Long          1825          58.4612
CFD            Short         5378          0.5779
CFD            Short         2604          57.3802
CFD            Short         6594          57.944
CFD            Short         27161         58.0842
CFD            Short         953           58.1258
CFD            Short         77727         58.2445
CFD            Short         55065         58.3681
CFD            Short         1296          58.3755
CFD            Short         353           58.4196
CFD            Short         2177          58.4601

(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                         08 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                   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