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               16 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      46,802,956      4.69%     1,077,440      0.11%
securities
(2) Derivatives    2,880,836      0.29%        43,302      0.00%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,785,242      4.99%     1,261,822      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         19,005                70.3948
Purchase         633                   70.7975
Purchase         79                    Transfer
Purchase         2,819                 69.6613
Purchase         5,484                 70.5294
Purchase         4,106                 70.5243
Purchase         227                   70.7975
Purchase         934                   69.6900
Purchase         776                   70.7153
Purchase         3,277                 70.5475
Purchase         22                    70.8446
Purchase         18,673                70.5297
Purchase         61                    Transfer
Purchase         776                   70.7153
Purchase         800                   69.9205
Purchase         18,774                69.8843
Purchase         933                   70.7975
Purchase         16                    70.8446
Purchase         1,125                 69.6900
Purchase         60                    Transfer
Purchase         2,663                 70.9872
Purchase         327                   69.6900
Purchase         91                    71.0800
Purchase         100                   89.9000 EUR
Purchase         71                    70.8446
Purchase         26                    70.8446
Sale             1,601                 70.2304
Sale             35,303                69.7310
Sale             4,843                 70.8792
Sale             776                   70.7170
Sale             79                    Transfer
Sale             9,848                 69.8473
Sale             550                   70.7094
Sale             60                    Transfer
Sale             84,693                71.4100
Sale             44                    70.5500
Sale             6,000                 70.4603
Sale             11,500                71.0987
Sale             125                   69.5100
Sale             1,597                 70.9780
Sale             671                   Transfer
Sale             45                    70.5100
Sale             11,149                71.1849
Sale             1,125                 69.6900
Sale             540                   69.8800
Sale             132                   70.6100
Sale             60                    70.6100
Sale             45                    70.7940
Sale             100                   70.8200
Sale             100                   71.4000
Sale             50                    71.1900
Sale             175                   69.5236
Sale             200                   71.0524
Sale             100                   71.1808
Sale             25                    67.6500
Sale             160                   70.6100
Sale             100                   71.4008
Sale             55                    70.5500
Sale             4,746                 69.6900
Sale             140                   71.1000
Sale             80                    70.6000
Sale             50                    71.1800
Sale             50                    71.2500
Sale             61                    Transfer
Sale             33                    69.7000
Sale             109                   70.9724
Sale             80                    71.1908

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          9848          69.8473
CFD            Long          1601          70.2303
CFD            Long          6000          70.4603
CFD            Long          550           70.7094
CFD            Long          1200          70.7268
CFD            Long          4843          70.8792
CFD            Long          1597          70.978
CFD            Long          11500         71.0986
CFD            Short         2819          69.6613
CFD            Short         18774         69.8842
CFD            Short         800           69.9204
CFD            Short         19005         70.3947
CFD            Short         4106          70.5243
CFD            Short         5484          70.5294
CFD            Short         18673         70.5296
CFD            Short         3277          70.5475
CFD            Short         776           70.7152
CFD            Short         1792          70.8312
CFD            Short         2663          70.9871


(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                         19 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                   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