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               05 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      46,933,575       4.70%    1,041,460      0.10%
securities
(2) Derivatives      746,740       0.07%    1,679,806      0.17%
(other than
options)
(3) Options and      101,400       0.01%      101,300      0.01%
agreements to
purchase/sell
Total             47,781,715       4.79%    2,822,566      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
Purchase         54,100                47.4277
Purchase         14,100                47.4499
Purchase         11,921                47.3557
Purchase         25                    46.8072
Purchase         25                    60.4000 EUR
Purchase         370                   46.7721
Purchase         19                    Transfer
Purchase         690                   47.5000
Purchase         55,115                47.4349
Purchase         1,800                 46.6326
Purchase         7,000                 47.5000
Purchase         161                   46.6326
Purchase         101                   46.6326
Purchase         3,392                 47.5000
Purchase         3,303                 48.0500
Purchase         26,261                47.5000
Purchase         2,032                 47.7511
Sale             40,332                47.6676
Sale             600                   48.7950
Sale             210                   48.4200
Sale             200                   47.8850
Sale             8,680                 47.4296
Sale             21,801                47.4376
Sale             46                    47.8042
Sale             13                    47.8342
Sale             715                   47.9400
Sale             19                    Transfer
Sale             25,277                47.4426
Sale             1,506                 47.6600
Sale             27,221                47.7073
Sale             28,659                47.3844
Sale             38,607                47.6302
Sale             139                   47.7042
Sale             100                   47.7963
Sale             250                   47.4442
Sale             44,700                57.7475

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          28659         47.3843
CFD            Long          3319          47.4205
CFD            Long          8680          47.4296
CFD            Long          21801         47.4375
CFD            Long          25277         47.4425
CFD            Long          38607         47.6301
CFD            Long          40332         47.6675
CFD            Long          2729          47.6863
CFD            Long          27221         47.7073
CFD            Long          200           47.885
CFD            Long          600           48.795
CFD            Long          44700         57.7475
CFD            Short         370           46.772
CFD            Short         25            46.8072
CFD            Short         609           47.2263
CFD            Short         11921         47.3556
CFD            Short         54100         47.4277
CFD            Short         55115         47.4349
CFD            Short         14100         47.4499
CFD            Short         2255          47.6265
CFD            Short         1540          47.6457
CFD            Short         26333         47.6461
CFD            Short         1290          47.6886
CFD            Short         1442          47.6906
CFD            Short         2074          47.6917

(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                         06 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)


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   500                    5,000.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   200                    5,000.0000       EURO           19/09/2008
Option            Purchased   -135                   5,200.0000       EURO           19/12/2008
Option            Purchased   -145                   5,200.0000       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   -500                   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