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               11 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      46,429,606      4.65%     1,110,069      0.11%
securities
(2) Derivatives      793,339      0.08%     1,763,175      0.18%
(other than
options)
(3) Options and      101,400      0.01%       101,300      0.01%
agreements to
purchase/sell
Total             47,324,345      4.74%     2,974,544      0.30%


(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         1,000                 46.9006
Purchase         2,780                 46.9335
Purchase         146,985               47.5434
Purchase         5,240                 47.4280
Purchase         261                   46.2000
Purchase         167,966               46.2063
Purchase         28,100                47.5085
Purchase         41,992                46.3900
Purchase         4,000                 45.9000
Purchase         62,987                46.3900
Purchase         62,987                45.9000
Purchase         418                   45.9000
Purchase         49,198                45.8381
Purchase         12,065                47.5623
Purchase         35,000                47.6051
Purchase         3,489                 46.4069
Sale             15,141                46.2749
Sale             19,432                46.4962
Sale             167,966               46.2063
Sale             880                   46.7422
Sale             3,391                 45.9611
Sale             54                    47.3742
Sale             7,860                 45.9827
Sale             1,144                 47.6452
Sale             8,178                 45.9865
Sale             23                    47.3263
Sale             52                    46.6605
Sale             28                    Transfer
Sale             36,001                46.9086
Sale             35,000                47.6051
Sale             200                   47.3447
Sale             12,808                45.9000
Sale             300                   46.7200
Sale             125                   47.7321
Sale             641                   45.9000
Sale             15,356                46.4115

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          3391          45.961
CFD            Long          8178          45.9865
CFD            Long          15141         46.2748
CFD            Long          15356         46.4115
CFD            Long          19432         46.4961
CFD            Long          880           46.7422
CFD            Long          36001         46.9086
CFD            Long          35000         47.6051
CFD            Long          1144          47.6452
CFD            Short         49198         45.838
CFD            Short         3489          46.4068
CFD            Short         1000          46.9006
CFD            Short         2780          46.9334
CFD            Short         4996          47.4571
CFD            Short         28100         47.5085
CFD            Short         146985        47.5434
CFD            Short         12065         47.5623
CFD            Short         35000         47.6051

(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                         12 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