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               14 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      46,423,078       4.65%      825,166      0.08%
securities
(2) Derivatives      454,380       0.05%    1,880,440      0.19%
(other than
options)
(3) Options and      101,400      0.01%       101,300      0.01%
agreements to
purchase/sell
Total             46,978,858      4.71%     2,806,906      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         1,600                 48.3700
Purchase         80                    48.9576
Purchase         175                   49.0368
Purchase         65,748                48.6466
Purchase         12,000                45.1370
Purchase         3,060                 48.2112
Purchase         17,910                48.2400
Purchase         8,384                 48.2500
Purchase         215                   48.2146
Purchase         3,300                 48.0077
Purchase         31,427                48.0000
Purchase         30,972                48.3981
Purchase         1,713,465             Transfer
Purchase         24,000                48.8200
Purchase         16,300                48.2593
Purchase         100,000               48.0000
Purchase         48                    Transfer
Purchase         21                    49.2416
Purchase         4,000                 48.1403
Purchase         80                    49.1300
Purchase         578                   48.9704
Purchase         648                   48.2146
Purchase         27,842                48.0000
Purchase         2,654                 48.0000
Purchase         100                   49.1584
Purchase         339                   48.9704
Purchase         9,185                 48.0000
Sale             114                   49.2300
Sale             2,382                 48.5330
Sale             48                    Transfer
Sale             925                   Transfer
Sale             1,345                 48.9631
Sale             2,967                 48.9249
Sale             1,642                 48.6016
Sale             2,284                 48.6995
Sale             11,528                48.8618
Sale             2,498                 48.6465
Sale             1,600                 47.9828
Sale             4                     48.8384
Sale             2,654                 48.0000
Sale             71,462                48.8998
Sale             28,441                48.7160
Sale             2,315                 48.4566
Sale             275                   48.1500
Sale             10,032                48.0000
Sale             215                   48.3739
Sale             546                   49.2300
Sale             1,001                 49.2300
Sale             289                   49.2420
Sale             250                   48.9442
Sale             250                   48.7905
Sale             200                   45.9365
Sale             2,268                 48.5000
Sale             100                   48.9642
Sale             180                   Transfer
Sale             3,412                 49.2300
Sale             125                   48.0700
Sale             20                    49.0142
Sale             4,956                 48.9768
Sale             4,137                 48.3739
Sale             40                    48.7128
Sale             105,146               48.6610
Sale             40                    48.7000
Sale             1,713,465             Transfer
Sale             200                   46.2900

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          1600          47.9828
CFD            Long          18013         48
CFD            Long          2315          48.4565
CFD            Long          2382          48.5329
CFD            Long          1642          48.6016
CFD            Long          2498          48.6465
CFD            Long          105146        48.6609
CFD            Long          2284          48.6995
CFD            Long          40            48.7127
CFD            Long          28441         48.716
CFD            Long          71462         48.8998
CFD            Long          4956          48.9768
CFD            Short         12000         45.1369
CFD            Short         18013         48
CFD            Short         3300          48.0076
CFD            Short         4000          48.1402
CFD            Short         3060          48.2111
CFD            Short         17910         48.24
CFD            Short         16300         48.2593
CFD            Short         1600          48.37
CFD            Short         30972         48.3981
CFD            Short         65748         48.6466
CFD            Short         24000         48.82
CFD            Short         134           48.9254

(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                         15 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