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               25 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      46,153,770      4.62%     1,846,852      0.19%
securities
(2) Derivatives    3,100,405      0.31%        38,953      0.00%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,355,625      4.95%     2,026,885      0.20%


(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         36,888                61.6607
Purchase         58                    61.7940
Purchase         18,430                61.6714
Purchase         258                   61.9300
Purchase         67,824                61.9427
Purchase         9,771                 61.8887
Purchase         697                   62.7000
Purchase         400                   62.3394
Purchase         18,430                61.6714
Purchase         100,000               62.0184
Purchase         1,955                 61.7843
Purchase         35                    Transfer
Purchase         4,750                 61.8925
Purchase         4,872                 62.7000
Purchase         162                   62.7000
Purchase         82                    62.2500
Purchase         592                   62.7000
Purchase         45,483                61.9293
Purchase         2,400                 61.6781
Purchase         395                   61.7843
Purchase         77                    61.9300
Purchase         9,605                 61.9539
Purchase         127,223               61.5300
Sale             6,598                 62.0934
Sale             871                   61.8482
Sale             197                   61.7748
Sale             35                    Transfer
Sale             819                   62.7000
Sale             6,475                 62.7000
Sale             5,474                 62.6906
Sale             25                    62.1100
Sale             8,697                 61.8482
Sale             25                    61.8300
Sale             20,810                62.0182
Sale             288                   61.8482
Sale             11,610                62.4631
Sale             2,400                 61.7204
Sale             18,430                61.6714
Sale             25                    62.1128
Sale             164                   61.8482
Sale             196                   61.8482
Sale             48                    62.7000
Sale             1,292                 62.1851
Sale             1,114                 61.2017
Sale             140                   77.5000 EUR
Sale             526                   61.8482
Sale             746                   61.8482
Sale             1,202                 61.8482
Sale             78                    62.0900
Sale             150                   61.8948
Sale             73                    61.8421
Sale             150                   61.8220
Sale             216                   61.8482
Sale             4,500                 62.7000
Sale             3,007                 61.8482
Sale             50                    62.3990
Sale             160                   62.1624
Sale             161                   61.8482
Sale             627                   61.8482
Sale             250                   62.2000
Sale             413                   61.8482
Sale             366                   61.8482
Sale             100                   62.1175
Sale             167                   61.7748
Sale             317                   61.8482
Sale             300                   61.8482
Sale             246                   61.8482
Sale             362                   61.8482
Sale             75                    62.2820

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          2400          61.7204
CFD            Long          20810         62.0181
CFD            Long          6598          62.0933
CFD            Long          11610         62.4631
CFD            Long          5474          62.6905
CFD            Short         36888         61.6606
CFD            Short         2400          61.6781
CFD            Short         9771          61.8887
CFD            Short         4750          61.8925
CFD            Short         45483         61.9292
CFD            Short         67824         61.9426
CFD            Short         9605          61.9539
CFD            Short         100000        62.0183
CFD            Short         400           62.3393

(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                         28 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   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   250                    3,000.0000       EURO           20/06/2008
Option            Purchased   250                    3,800.0000       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   -2,000                 70.0000          AMER           20/06/2008
Option            Purchased   -38,000                70.0000          AMER           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