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               22 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      46,738,909      4.68%       921,648      0.09%
securities
(2) Derivatives    2,712,581      0.27%       162,415      0.02%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,552,940      4.97%     1,225,143      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         1,307                 67.3857
Purchase         6,744                 66.6900
Purchase         3,254                 66.6900
Purchase         2,262                 66.6900
Purchase         753                   67.4237
Purchase         1,600                 Transfer
Purchase         3,225                 67.4020
Purchase         529                   67.4883
Purchase         7,689                 67.4022
Purchase         815                   6760.1400
Purchase         696                   67.4046
Purchase         305                   67.4883
Purchase         877                   67.3764
Purchase         809                   67.3897
Purchase         770                   67.3950
Purchase         602                   67.4237
Purchase         1,300                 65.9300
Purchase         5,684                 66.7000
Purchase         72                    Transfer
Purchase         6,900                 67.4818
Purchase         22,936                67.1819
Purchase         7,693                 67.1146
Purchase         1,900                 67.2516
Purchase         1,366                 67.5509
Purchase         9,701                 66.6900
Purchase         54                    Transfer
Purchase         5,486                 66.6900
Purchase         1,900                 67.2764
Purchase         815                   6760.1400
Purchase         1,841                 67.2067
Purchase         99,727                67.5956
Purchase         49                    Transfer
Purchase         300                   67.0826
Purchase         22,194                67.4039
Purchase         24,281                67.8852
Purchase         1,660                 67.3739
Purchase         2,000                 65.9300
Purchase         759                   66.6900
Purchase         988                   67.3688
Purchase         1,322                 67.4237
Purchase         121                   67.7800
Purchase         683                   67.4237
Purchase         1,631                 67.4237
Purchase         402                   67.4237
Purchase         610                   67.4237
Purchase         196                   67.4237
Purchase         603                   67.4237
Purchase         1,185                 67.3785
Purchase         1,932                 67.3846
Purchase         3,930                 67.4059
Purchase         210                   67.4883
Purchase         2,334                 67.3926
Purchase         9,470                 66.6900
Purchase         162                   67.4883
Purchase         6,585                 66.6900
Purchase         996                   67.3705
Sale             50,666                65.9300
Sale             60                    67.7124
Sale             1,900                 67.5766
Sale             49                    Transfer
Sale             2,573                 66.3400
Sale             65                    66.5800
Sale             756                   66.6900
Sale             385                   67.5147
Sale             815                   6760.3090
Sale             22,425                66.6900
Sale             24                    67.5500
Sale             54                    Transfer
Sale             72                    Transfer
Sale             6,118                 67.5639
Sale             16                    Transfer
Sale             486                   67.2033
Sale             1,097                 66.6900
Sale             60                    67.7220
Sale             24,281                67.8852
Sale             50                    67.3720
Sale             120                   67.5000
Sale             80                    67.7000
Sale             300                   67.6500
Sale             50                    67.7000
Sale             1,061                 66.6900
Sale             20,182                67.5445
Sale             144                   67.7136
Sale             100                   67.6636
Sale             3,941                 67.3317
Sale             750                   67.3500
Sale             50                    67.7000
Sale             100                   67.6624
Sale             100                   67.6624
Sale             20,646                66.6900
Sale             24,281                67.8852
Sale             2,000                 67.3699
Sale             500                   67.6528
Sale             740                   67.2406
Sale             120                   67.7632
Sale             45                    67.7300

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          65            66.58
CFD            Long          486           67.2032
CFD            Long          3941          67.3316
CFD            Long          2000          67.3698
CFD            Long          1747          67.4909
CFD            Long          301           67.5112
CFD            Long          385           67.5146
CFD            Long          20182         67.5445
CFD            Long          6118          67.5638
CFD            Long          1900          67.5766
CFD            Long          500           67.6528
CFD            Short         5684          66.7
CFD            Short         300           67.0826
CFD            Short         7693          67.1146
CFD            Short         22936         67.1819
CFD            Short         1841          67.2067
CFD            Short         1900          67.2516
CFD            Short         1900          67.2764
CFD            Short         6900          67.4817
CFD            Short         1366          67.5509
CFD            Short         99727         67.5955
CFD            Short         815           6760.14

(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                         23 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                    3,800.0000       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   -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