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               23 May 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      46,898,314      4.70%       958,408      0.10%
securities
(2) Derivatives    2,749,248      0.28%       127,507      0.01%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,749,012      4.98%     1,226,995      0.12%


(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         150                   63.5668
Purchase         23                    64.7500
Purchase         4,221                 62.9900
Purchase         2,557                 64.4746
Purchase         11,084                63.6573
Purchase         6,012                 62.9994
Purchase         217                   62.9900
Purchase         100                   66.2100
Purchase         309                   64.2200
Purchase         64,824                63.1266
Purchase         7,607                 62.9900
Purchase         500                   66.2043
Purchase         800                   64.2646
Purchase         1,400                 64.3206
Purchase         19,376                66.6900
Purchase         3,370                 64.1660
Purchase         90                    80.5000 EUR
Purchase         522                   62.9900
Purchase         136,422               66.6900
Purchase         691                   66.6900
Purchase         19,812                66.6900
Purchase         94,098                66.6900
Purchase         3,523                 66.6900
Sale             345                   Transfer
Sale             1,032                 Transfer
Sale             44                    66.0600
Sale             6,672                 64.0166
Sale             32,321                63.6239
Sale             20,286                63.4772
Sale             73                    67.1416
Sale             1,550                 67.1504
Sale             3,994                 64.8557
Sale             7,853                 64.4080
Sale             22,751                64.6281
Sale             21                    65.3300
Sale             7,607                 62.9900
Sale             5,684                 64.2084
Sale             235                   66.2200
Sale             1,530                 67.3451
Sale             882                   62.9900
Sale             522                   62.9900
Sale             25,634                62.9900
Sale             50                    81.3000 EUR
Sale             50                    81.4100 EUR
Sale             75                    63.6924
Sale             100                   64.4884
Sale             220                   66.2200
Sale             250                   66.2200
Sale             77                    66.1400
Sale             59,941                64.3692
Sale             200                   63.5316
Sale             150                   66.2200
Sale             50                    64.6800
Sale             250                   63.8000
Sale             7,637                 62.9900
Sale             6,340                 62.9900
Sale             187                   63.7156
Sale             150                   64.7540
Sale             140                   64.8436
Sale             3,200                 64.6078
Sale             200                   64.3624



(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          20286         63.4771
CFD            Long          32321         63.6239
CFD            Long          6672          64.0165
CFD            Long          5684          64.2084
CFD            Long          59941         64.3692
CFD            Long          7853          64.4079
CFD            Long          3200          64.6077
CFD            Long          22751         64.6281
CFD            Long          3994          64.8557
CFD            Short         6012          62.9994
CFD            Short         64824         63.1265
CFD            Short         11084         63.6572
CFD            Short         3370          64.166
CFD            Short         186           64.2057
CFD            Short         800           64.2646
CFD            Short         1400          64.3206
CFD            Short         387           64.4357
CFD            Short         2557          64.4745
CFD            Short         500           66.2042
CFD            Short         100           66.21



(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                         27 May 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                   2,500.0000       EURO           20/06/2008
Option            Purchased   -250                   5,200.0000       EURO           19/09/2008
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