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               18 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      46,159,843       4.62%      884,447      0.09%
securities
(2) Derivatives      513,309       0.05%    1,846,798      0.19%
(other than
options)
(3) Options and      101,400      0.01%       101,300      0.01%
agreements to
purchase/sell
Total             46,774,552      4.69%     2,832,545      0.28%


(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         2,057                 46.5062
Purchase         3,952                 47.0925
Purchase         2,085                 46.8458
Purchase         40                    Transfer
Purchase         14                    46.5470
Purchase         1,500                 46.9365
Purchase         1,278                 47.1960
Purchase         6,500                 47.2021
Purchase         57,909                47.0179
Purchase         2,510                 47.3459
Purchase         700                   47.2478
Purchase         40                    Transfer
Purchase         41                    Transfer
Purchase         13,549                46.8706
Purchase         1,061                 46.8300
Purchase         1,101                 46.8300
Purchase         4,781                 46.8300
Purchase         159                   47.3000
Purchase         266                   47.3000
Purchase         599                   47.3000
Purchase         106                   47.0000
Sale             1,600                 46.7798
Sale             19,190                46.8593
Sale             20                    46.9730
Sale             1,400                 46.8336
Sale             40                    Transfer
Sale             40                    Transfer
Sale             13,106                47.3769
Sale             5,016                 46.8300
Sale             4,357                 46.8300
Sale             3,240                 46.8300
Sale             150                   47.3500
Sale             300                   47.3000
Sale             419                   46.5000
Sale             11,500                47.1300
Sale             16                    47.3860
Sale             84                    47.0030
Sale             1,864                 47.4158
Sale             2,400                 46.8856
Sale             41                    Transfer
Sale             31,603                47.0695
Sale             400                   46.5200
Sale             7,753                 46.8975

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          1600          46.7798
CFD            Long          1400          46.8335
CFD            Long          19190         46.8593
CFD            Long          2400          46.8856
CFD            Long          7753          46.8974
CFD            Long          20            46.973
CFD            Long          31603         47.0695
CFD            Long          300           47.3
CFD            Long          13106         47.3769
CFD            Long          1864          47.4158
CFD            Short         2057          46.5061
CFD            Short         2085          46.8458
CFD            Short         13549         46.8706
CFD            Short         1728          46.9164
CFD            Short         1500          46.9364
CFD            Short         57909         47.0178
CFD            Short         3952          47.0924
CFD            Short         6500          47.2021
CFD            Short         700           47.2478
CFD            Short         2510          47.3459

(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 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   100,000                 56.0000         AMER           18/12/2009
Option            Purchased   -100,000                64.0000         AMER           21/11/2008
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



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