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               28 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      46,924,500      4.70%       924,314      0.09%
securities
(2) Derivatives    2,732,397      0.27%       159,890      0.02%
(other than
options)
(3) Options and      101,461      0.01%       341,080      0.03%
agreements to
purchase/sell
Total             49,758,358      4.99%     1,425,284      0.14%


(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         375                   61.6993
Purchase         1,091                 61.0100
Purchase         1,060                 61.3700
Purchase         3,900                 62.1023
Purchase         900                   61.5487
Purchase         9,081                 61.4547
Purchase         6,940                 61.6814
Purchase         150                   61.5693
Purchase         1,300                 62.0110
Purchase         800                   61.5487
Purchase         3,763                 61.0231
Purchase         12,505                61.4834
Purchase         21,800                61.4028
Purchase         73                    61.5400
Purchase         8,381                 61.8033
Purchase         70                    61.5949
Purchase         2,498                 61.3817
Purchase         64                    61.3700
Purchase         337                   64.6313
Purchase         2,455                 Transfer
Sale             85                    61.8031
Sale             50                    61.2224
Sale             100                   62.0700
Sale             192                   61.0300
Sale             4,755                 61.3700
Sale             100                   61.5724
Sale             40                    61.5800
Sale             75                    61.0300
Sale             57,423                61.4275
Sale             68                    61.2224
Sale             337                   64.6313
Sale             5,315                 61.5277
Sale             12,688                61.7320
Sale             1,524                 61.7852
Sale             3,679                 61.6991
Sale             60                    61.5723
Sale             2,700                 61.9056
Sale             20                    61.7100
Sale             337                   61.2000
Sale             7,204                 61.3007
Sale             238                   61.9700
Sale             67                    61.3696
Sale             400                   61.0409
Sale             85                    61.2800
Sale             50                    61.2800
Sale             150                   61.2800
Sale             100                   61.2800
Sale             250                   61.2800
Sale             90                    61.2800
Sale             60                    61.2800
Sale             155                   61.2800
Sale             870                   61.3700
Sale             50                    61.1700
Sale             100                   61.2800
Sale             400                   61.2800
Sale             400                   61.2800
Sale             400                   61.2800
Sale             60                    62.0700
Sale             250                   61.2800
Sale             72                    61.2800
Sale             75                    61.2800
Sale             2,616                 61.3700
Sale             95                    62.0700
Sale             50                    61.2800
Sale             60                    61.9423
Sale             50                    61.9424
Sale             200                   61.2800
Sale             175                   61.2800
Sale             1,045                 61.2377
Sale             60                    61.2800
Sale             60                    61.2800
Sale             375                   61.2800
Sale             120                   61.2800
Sale             60                    61.2800
Sale             100                   61.8532
Sale             75                    61.2800
Sale             250                   61.2800
Sale             50                    61.2800
Sale             50                    61.2800
Sale             479                   61.2800
Sale             85                    61.2800
Sale             75                    61.2800
Sale             200                   61.3440
Sale             95                    61.2800

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          400           61.0408
CFD            Long          7204          61.3007
CFD            Long          3596          61.37
CFD            Long          57423         61.4274
CFD            Long          5315          61.5276
CFD            Long          162           61.652
CFD            Long          3679          61.6991
CFD            Long          12688         61.732
CFD            Long          1524          61.7851
CFD            Long          2700          61.9055
CFD            Short         3763          61.0231
CFD            Short         2498          61.3816
CFD            Short         9081          61.4546
CFD            Short         12505         61.4834
CFD            Short         150           61.5692
CFD            Short         6940          61.6814
CFD            Short         375           61.6992
CFD            Short         8381          61.8033
CFD            Short         1300          62.011
CFD            Short         3900          62.1023


(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)
CALL            Purchase          11000              76        EURO             20/06/2008    14

(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                         29 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   -135                   5,200.0000       EURO           19/12/2008
Option            Purchased   -100,000               30.0000          AMER           20/06/2008
Option            Purchased   -38,000                70.0000          AMER           20/06/2008
Option            Purchased   -10,000                74.0000          AMER           20/06/2008
Option            Purchased   -2,000                 70.0000          AMER           20/06/2008
Option            Purchased   -300                   3,800.0000       EURO           20/06/2008
Option            Purchased   -250                   2,500.0000       EURO           20/06/2008
Option            Purchased   -190,000               74.0000          AMER           20/06/2008
Option            Purchased   -145                   5,200.0000       EURO           19/12/2008
Option            Purchased   100,000                56.0000          AMER           18/12/2009
Option            Purchased   11                     7,600.0000       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   250                    3,800.0000       EURO           20/06/2008
Option            Purchased   250                    3,000.0000       EURO           20/06/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   -250                    5,200.0000      EURO           19/09/2008

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