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               19 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      46,803,110      4.69%       983,354      0.10%
securities
(2) Derivatives    2,786,150      0.28%        40,442      0.00%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,690,710      4.98%     1,164,876      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         6,659                 70.1899
Purchase         162                   69.7870
Purchase         41,392                70.3770
Purchase         174                   70.2906
Purchase         1,074                 70.5672
Purchase         25,260                70.4524
Purchase         800                   70.3906
Purchase         4,436                 70.7800
Purchase         22                    70.1000
Purchase         47                    Transfer
Purchase         57                    Transfer
Purchase         12,798                70.3077
Purchase         211                   69.9349
Purchase         1,309                 69.7290
Purchase         5,577                 70.0175
Purchase         1,438                 70.1624
Purchase         15                    87.7500 EUR
Purchase         1,700                 69.7290
Purchase         12,756                69.9871
Purchase         802                   69.7500
Purchase         484                   70.0183
Purchase         85                    69.7500
Purchase         4,746                 70.4224
Sale             60                    69.5900
Sale             300                   69.9885
Sale             150                   69.6900
Sale             55                    70.3747
Sale             75                    70.0924
Sale             100                   70.1532
Sale             200                   69.7948
Sale             100                   70.8636
Sale             98                    69.6900
Sale             53,167                70.7800
Sale             1,300                 69.7377
Sale             25                    69.5500
Sale             32,700                70.0411
Sale             100                   70.3800
Sale             1,582                 70.4455
Sale             5,053                 69.9686
Sale             57                    Transfer
Sale             1,125                 70.0500
Sale             47                    Transfer
Sale             800                   69.7385
Sale             14                    69.5632
Sale             3,022                 70.1758
Sale             196                   69.7632
Sale             5,152                 70.1860
Sale             66                    69.5400
Sale             629                   69.9727
Sale             50                    69.9532
Sale             30                    70.1317
Sale             50                    70.4080
Sale             40                    70.9100
Sale             100                   70.1012
Sale             50                    69.9224
Sale             100                   69.8832
Sale             50                    70.6048
Sale             1,052                 69.9672
Sale             262                   69.9811
Sale             425                   69.9888
Sale             1,834                 69.9888
Sale             154                   69.9888
Sale             1,189                 69.9888
Sale             444                   69.9888
Sale             1,683                 69.9888
Sale             709                   69.9668
Sale             1,949                 69.9684
Sale             125                   70.1000
Sale             130                   70.1336
Sale             1,685                 69.9683
Sale             44                    70.4864
Sale             50                    70.3800
Sale             247                   69.9857
Sale             311                   69.9815
Sale             249                   69.9842
Sale             220                   70.7200
Sale             143                   69.9888
Sale             1,000                 70.6300
Sale             85                    69.8532
Sale             120                   70.5336
Sale             328                   69.9809
Sale             55                    69.8220
Sale             45                    69.8800
Sale             70                    70.7911
Sale             249                   69.9842
Sale             200                   70.3800
Sale             150                   70.1348

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          1300          69.7376
CFD            Long          800           69.7385
CFD            Long          196           69.7632
CFD            Long          300           69.9885
CFD            Long          3022          70.1757
CFD            Long          1582          70.4454
CFD            Short         162           69.7869
CFD            Short         12756         69.9871
CFD            Short         5577          70.0174
CFD            Short         6659          70.1898
CFD            Short         41392         70.3769
CFD            Short         800           70.3905
CFD            Short         4746          70.4223
CFD            Short         25260         70.4523
CFD            Short         1074          70.5672


(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                         20 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