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               15 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      46,898,298      4.70%     1,115,059      0.11%
securities
(2) Derivatives    2,917,255      0.29%        38,691      0.00%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,917,003      5.00%     1,294,830      0.13%


(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         2,050                 70.2300
Purchase         30                    69.1367
Purchase         271                   67.4050
Purchase         8,580                 70.2300
Purchase         779                   70.2300
Purchase         581                   70.2300
Purchase         53                    70.2300
Purchase         291                   70.2300
Purchase         4,296                 70.2300
Purchase         66                    69.1368
Purchase         22,584                70.2300
Purchase         80                    69.1368
Purchase         4,945                 67.8727
Purchase         2,212                 69.7523
Purchase         13,118                69.4947
Purchase         800                   68.8631
Purchase         13,992                69.7409
Purchase         9,593                 69.5678
Purchase         1,032                 70.0174
Purchase         7,057                 67.5766
Purchase         390                   70.2300
Purchase         360                   67.9500
Purchase         60                    67.1500
Purchase         1,733                 68.7290
Purchase         201                   67.1500
Purchase         518                   68.7290
Purchase         30                    67.1500
Purchase         260                   68.7290
Purchase         547                   68.7290
Purchase         64                    67.1500
Sale             41,591                67.7806
Sale             16,293                68.1248
Sale             49                    69.5500
Sale             64,126                67.7100
Sale             32,700                67.4728
Sale             600                   68.5100
Sale             2                     67.4300
Sale             75                    67.3100
Sale             8                     67.4800
Sale             52                   Transfer
Sale             10,394                68.4105
Sale             100                   68.0924
Sale             650                   69.8700
Sale             2,462                 70.2300
Sale             204                   68.5955
Sale             5,484                 70.2195
Sale             29,800                67.9007
Sale             36                    67.2600
Sale             15,533                69.0253
Sale             146                   70.2300
Sale             202                   70.2300
Sale             8,690                 67.8910
Sale             6,301                 67.7029
Sale             119                   68.3748
Sale             1,768                 70.2300
Sale             14,238                70.2300
Sale             575                   69.1600
Sale             50                    68.1500
Sale             700                   69.0800
Sale             600                   68.0000
Sale             10                    67.1500
Sale             9                     67.1500
Sale             136                   68.7846
Sale             85                    68.3624
Sale             1,399                 69.4457
Sale             19                    67.1500
Sale             175                   68.4600
Sale             140                   68.7846
Sale             1,031                 68.7846
Sale             6,033                 70.2300
Sale             3,272                 70.2300
Sale             180                   68.4220
Sale             90                    69.8500
Sale             85                    67.6400
Sale             100                   67.6748
Sale             272                   68.7846
Sale             304                   68.7846
Sale             205                   67.1500
Sale             144                   67.4840
Sale             200                   68.2040
Sale             146                   70.2300
Sale             146                   70.2300
Sale             146                   70.2300
Sale             168                   68.7846
Sale             138                   70.2300
Sale             12                    67.1500
Sale             23                    67.1500
Sale             30,500                69.9582
Sale             310                   70.2300
Sale             2,747                 68.7846
Sale             77                    67.1500
Sale             100                   68.3100
Sale             287                   70.2300



(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          2             67.43
CFD            Long          6301          67.7029
CFD            Long          41591         67.7805
CFD            Long          8690          67.891
CFD            Long          29800         67.9007
CFD            Long          16293         68.1248
CFD            Long          840           68.2365
CFD            Long          139           68.2522
CFD            Long          10394         68.4104
CFD            Long          204           68.5954
CFD            Long          15533         69.0252
CFD            Long          30500         69.9581
CFD            Long          5484          70.2194
CFD            Short         7057          67.5766
CFD            Short         4945          67.8727
CFD            Short         4219          68.7497
CFD            Short         800           68.863
CFD            Short         13118         69.4946
CFD            Short         9593          69.5678
CFD            Short         13992         69.7409
CFD            Short         2212          69.7523
CFD            Short         1032          70.0174



(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                         16 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   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
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



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