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               08 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      46,129,718      4.62%     1,140,674      0.11%
securities
(2) Derivatives      826,146      0.08%     1,646,892      0.17%
(other than
options)
(3) Options and      101,400      0.01%       101,300      0.01%
agreements to
purchase/sell
Total             47,057,264      4.71%     2,888,866      0.29%


(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         41,992                46.8800
Purchase         2,172                 47.2496
Purchase         44,000                47.3032
Purchase         19,000                46.8500
Purchase         2,300                 46.9339
Purchase         358                   46.8500
Purchase         41,992                46.8900
Purchase         146,972               46.8857
Purchase         31,428                46.8500
Purchase         2,205                 46.8105
Purchase         25,627                46.9718
Purchase         14,985                46.6950
Purchase         4,190                 46.2425
Purchase         9,000                 46.4751
Purchase         21,000                46.8969
Purchase         9,500                 46.8697
Purchase         8,000                 47.8701
Purchase         41,992                46.8900
Purchase         7,199                 46.4499
Purchase         20,996                46.8800
Purchase         40                    46.7700
Purchase         440                   46.8500
Purchase         850                   46.8500
Purchase         109                   60.1600 EUR
Purchase         1,647                 46.8500
Purchase         29,009                46.8500
Sale             146,972               46.8857
Sale             14,749                46.6363
Sale             36,314                46.6736
Sale             42                    Transfer
Sale             2,780                 46.8441
Sale             6,500                 47.3800
Sale             40,213                46.9336
Sale             46,157                46.8366
Sale             32                    49.3463
Sale             77                    47.3542
Sale             10,010                46.6365
Sale             2,107                 46.8500
Sale             42                    49.4000
Sale             1,129                 46.6418
Sale             65,462                46.9030
Sale             1,991                 46.8353
Sale             44,000                47.3032
Sale             215                   47.3500
Sale             22,969                46.6364
Sale             29,009                46.8500
Sale             1,189                 46.8500
Sale             30                    46.8823
Sale             39                    47.1385
Sale             2,426                 46.6335
Sale             456                   46.6111
Sale             214                   46.6331
Sale             13,827                46.9869
Sale             231                   46.6299
Sale             47                    47.1084
Sale             430                   46.6034
Sale             14,890                46.5890
Sale             104                   46.8500
Sale             44,000                47.3032
Sale             100                   47.6200
Sale             65                    47.3563
Sale             25                    47.2864
Sale             7,449                 46.6364
Sale             332                   46.6068

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          14890         46.589
CFD            Long          36314         46.6735
CFD            Long          46157         46.8366
CFD            Long          2780          46.8441
CFD            Long          65462         46.903
CFD            Long          40213         46.9335
CFD            Long          13827         46.9869
CFD            Long          44000         47.3031
CFD            Long          6500          47.38
CFD            Short         9000          0.4751
CFD            Short         4190          46.2425
CFD            Short         7199          46.4498
CFD            Short         14985         46.695
CFD            Short         9500          46.8696
CFD            Short         2300          46.9339
CFD            Short         25627         46.9718
CFD            Short         2172          47.2496
CFD            Short         8000          47.8701

(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                         11 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