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               20 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      46,458,853       4.65%      795,711      0.08%
securities
(2) Derivatives      546,024       0.05%    1,885,567      0.19%
(other than
options)
(3) Options and      101,400       0.01%      101,650      0.01%
agreements to
purchase/sell
Total             47,106,277       4.72%    2,782,928      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         2,204                 48.4520
Purchase         33,896                49.4940
Purchase         30,387                49.5211
Purchase         10,500                48.8168
Purchase         159                   49.8600
Purchase         2,400                 48.7976
Purchase         34,381                49.1820
Purchase         199,500               49.7000
Purchase         18,800                49.0587
Purchase         100                   49.2500
Purchase         10,500                49.2500
Purchase         37,000                49.8600
Purchase         2,045                 Transfer
Purchase         7,472                 48.4520
Purchase         32                    46.2200
Purchase         3,291                 48.4520
Purchase         3,522                 46.7717
Purchase         163                   49.6600
Purchase         108                   49.6600
Purchase         110                   49.0555
Purchase         15,000                48.0606
Purchase         3,450                 48.1352
Sale             3,522                 46.7717
Sale             100                   49.6830
Sale             82,860                49.6464
Sale             60                    63.0000 EUR
Sale             25                    62.6000 EUR
Sale             1,131                 49.4529
Sale             35                    46.0745
Sale             1,002                 49.8600
Sale             4,573                 49.5793
Sale             714                   49.4743
Sale             200                   49.4893
Sale             110                   49.1145
Sale             32                    47.2745
Sale             23,965                49.6724
Sale             24                    46.0790
Sale             52,635                49.6629
Sale             100                   49.2500
Sale             42,618                49.6277
Sale             600                   49.0300
Sale             25                    47.0996
Sale             369                   46.0529
Sale             75                    47.9600
Sale             33                    46.1800
Sale             665                   49.4700
Sale             86,295                48.8734
Sale             11,831                49.6052
Sale             200                   49.5260
Sale             10,399                49.6867
Sale             3,522                 49.1714

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          369           46.0528
CFD            Long          86295         48.8734
CFD            Long          100           49.25
CFD            Long          1131          49.4529
CFD            Long          714           49.4742
CFD            Long          200           49.4892
CFD            Long          4573          49.5793
CFD            Long          11831         49.6051
CFD            Long          42618         49.6276
CFD            Long          52635         49.6628
CFD            Long          23965         49.6723
CFD            Long          10399         49.6866
CFD            Short         15000         48.0606
CFD            Short         3450          48.1351
CFD            Short         2400          48.7976
CFD            Short         10500         48.8167
CFD            Short         18800         49.0586
CFD            Short         34381         49.1819
CFD            Short         10600         49.25
CFD            Short         2064          49.4053
CFD            Short         242           49.4623
CFD            Short         33896         49.494
CFD            Short         30387         49.5211
CFD            Short         687           49.8501

(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           Sale               350                 50       EURO            19/12/08     .575

(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                         21 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
Option            Purchased   -350                   5,000.0000       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