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               19 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      46,371,553       4.65%      686,914      0.07%
securities
(2) Derivatives      441,751       0.04%    1,841,717      0.18%
(other than
options)
(3) Options and      101,400       0.01%      101,300      0.01%
agreements to
purchase/sell
Total             46,914,704       4.70%    2,629,931      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         2,524                 46.5983
Purchase         2,513                 46.5025
Purchase         3,071                 47.1071
Purchase         11,172                46.1913
Purchase         10,000                46.4174
Purchase         6,036                 46.5952
Purchase         56                    Transfer
Purchase         13,796                46.4462
Purchase         2,524                 46.5971
Purchase         36                    46.2876
Purchase         40                    Transfer
Purchase         83,983                47.1600
Purchase         11                    47.3840
Purchase         39,499                46.3253
Purchase         190                   47.0368
Purchase         300                   47.1967
Purchase         30,446                46.3079
Purchase         26,330                46.3739
Purchase         2,851                 45.9282
Purchase         9,590                 46.4100
Purchase         41,992                47.1600
Sale             49                    Transfer
Sale             4,148                 46.5490
Sale             5,000                 46.3006
Sale             14,287                46.7091
Sale             56                    Transfer
Sale             33,109                47.0298
Sale             40                    Transfer
Sale             246                   Transfer
Sale             1,000                 47.0275
Sale             8,272                 47.0309
Sale             2,524                 46.5983
Sale             100                   47.2422
Sale             29                    47.6560
Sale             4,711                 46.5377
Sale             300                   47.1967
Sale             75                    46.3445
Sale             150                   47.3275
Sale             65                    46.6360
Sale             65                    47.3275
Sale             224                   47.0660
Sale             800                   46.4755

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          5000          46.3005
CFD            Long          800           46.4755
CFD            Long          4148          46.5489
CFD            Long          14287         46.7091
CFD            Long          1000          47.0275
CFD            Long          33109         47.0298
CFD            Long          8272          47.0308
CFD            Long          300           47.1966
CFD            Long          100           47.2422
CFD            Short         11172         46.1912
CFD            Short         36            46.2875
CFD            Short         30446         46.3078
CFD            Short         39499         46.3253
CFD            Short         26330         46.3739
CFD            Short         1013          46.4008
CFD            Short         10000         46.4174
CFD            Short         13796         46.4462
CFD            Short         2513          46.5024
CFD            Short         1828          46.5808
CFD            Short         6036          46.5951
CFD            Short         2524          46.5982
CFD            Short         300           47.1966

(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                         20 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