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 August 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      46,512,580       4.65%      674,010      0.07%
securities
(2) Derivatives      604,237       0.06%    1,833,773      0.18%
(other than
options)
(3) Options and      101,200       0.01%      101,450      0.01%
agreements to
purchase/sell
Total             47,218,017       4.72%    2,609,233      0.26%


(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         5,929                 53.1956
Purchase         11,855                52.9133
Purchase         67                    52.8900
Purchase         16,700                53.3100
Purchase         200                   52.7450
Purchase         2,105                 52.0291
Purchase         191                   51.9600
Purchase         10,310                52.6568
Purchase         125,977               53.3800
Purchase         38                    Transfer
Purchase         41,992                53.3800
Purchase         16,797                53.2800
Purchase         55,190                52.7080
Purchase         2,528                 52.4747
Purchase         479                   52.5984
Purchase         41,992                53.3800
Sale             25                    51.9760
Sale             97                    53.2800
Sale             16,700                53.5766
Sale             775                   52.2001
Sale             175                   53.0660
Sale             800                   52.8500
Sale             3,920                 51.9300
Sale             2,281                 52.8546
Sale             1,010                 52.0900
Sale             11                    52.5255
Sale             200                   52.0932
Sale             4,475                 51.9300
Sale             35                    52.1832
Sale             85                    53.0724
Sale             4,192                 53.1738
Sale             16,797                53.2800
Sale             668                   52.0200
Sale             200                   52.7450
Sale             18,052                52.4444
Sale             19                    51.7560
Sale             60                    52.7232
Sale             4                     51.6730
Sale             40                    51.6660
Sale             400                   53.0221
Sale             35                    52.9504
Sale             64,833                52.3253
Sale             59                    52.0216
Sale             25,600                52.7001

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          676           52.1685
CFD            Long          775           52.2001
CFD            Long          64833         52.3252
CFD            Long          18052         52.4444
CFD            Long          11            52.5254
CFD            Long          25600         52.7001
CFD            Long          200           52.745
CFD            Long          400           53.022
CFD            Long          4192          53.1738
CFD            Short         2105          52.0291
CFD            Short         2528          52.4746
CFD            Short         479           52.5984
CFD            Short         10310         52.6568
CFD            Short         55190         52.708
CFD            Short         200           52.745
CFD            Short         5929          53.1956

(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                         29 August 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   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   300                    5,000.0000       EURO           19/12/2008
Option            Purchased   200                    5,000.0000       EURO           19/09/2008
Option            Purchased   200                    5,000.0000       EURO           19/12/2008
Option            Purchased   -135                   5,200.0000       EURO           19/12/2008
Option            Purchased   -145                   5,200.0000       EURO           19/12/2008
Option            Purchased   -200                   7,000.0000       EURO           19/12/2008
Option            Purchased   -250                   5,200.0000       EURO           19/09/2008
Option            Purchased   -270                   6,400.0000       EURO           19/12/2008
Option            Purchased   -300                   7,000.0000       EURO           19/12/2008
Option            Purchased   -350                   5,000.0000       EURO           19/12/2008
Option            Purchased   100,000                56.0000          AMER           18/12/2009
Option            Purchased   -100,000               64.0000          AMER           21/11/2008



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