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               04 September 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      46,714,452       4.68%      588,669      0.06%
securities
(2) Derivatives      564,973       0.06%    2,016,000      0.20%
(other than
options)
(3) Options and      101,200       0.01%      101,400      0.01%
agreements to
purchase/sell
Total             47,380,625       4.75%    2,706,069      0.27%


(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           558                     44.7167
Purchase           26                      46.6895
Purchase           19                      48.2555
Purchase           1,700                   46.4512
Purchase           9,700                   46.7022
Purchase           500                     46.7961
Purchase           1,600                   Transfer
Purchase           520                     45.8376
Purchase           3,452                   46.2805
Purchase           23,601                  47.1106
Purchase           11,500                  47.2320
Purchase           3,100                   47.1423
Purchase           50,000                  48.1134
Purchase           30                      46.9570
Purchase           28,831                  45.0592
Purchase           2,527                   44.7156
Purchase           676                     46.2303
Purchase           26                      47.5204
Purchase           39,642                  45.3474
Purchase           651                     44.7100
Sale               17,019                  46.9726
Sale               500                     45.9624
Sale               17                      47.4530
Sale               45,905                  46.6155
Sale               2,500                   45.6815
Sale               23,000                  47.4896
Sale               1,000                   46.2172
Sale               5,019                   46.9886
Sale               38                      47.8460
Sale               1,738                   47.5185
Sale               712                     48.0024
Sale               75                      58.4500 EUR
Sale               100                     58.2300 EUR
Sale               290                     44.7100
Sale               55                      47.9540
Sale               1,073                   48.2700
Sale               80                      47.3700
Sale               82,961                  46.5437
Sale               500                     47.2897
Sale               6,859                   45.7636
Sale               9,455                   46.5226
Sale               19,954                  47.9065
Sale               386                     44.7100
Sale               131                     47.6945
Sale               130                     46.7330

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          2500          45.6815
CFD            Long          6859          45.7635
CFD            Long          500           45.9624
CFD            Long          1000          46.2172
CFD            Long          9455          46.5225
CFD            Long          82961         46.5436
CFD            Long          45905         46.6155
CFD            Long          17019         46.9725
CFD            Long          5019          46.9886
CFD            Long          500           47.2897
CFD            Long          23000         47.4896
CFD            Long          118           47.5384
CFD            Long          19954         47.9064
CFD            Short         2527          44.7155
CFD            Short         558           44.7167
CFD            Short         28831         45.0591
CFD            Short         39642         45.3473
CFD            Short         520           45.8375
CFD            Short         3452          46.2804
CFD            Short         1700          46.4512
CFD            Short         776           46.4948
CFD            Short         9700          46.7021
CFD            Short         30            46.957
CFD            Short         23601         47.1106
CFD            Short         3100          47.1423
CFD            Short         11500         47.232
CFD            Short         617           47.7825
CFD            Short         261           47.7861
CFD            Short         143           47.7981
CFD            Short         50000         48.1134

(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                         05 September 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                    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   150                    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   -150                   7,000.0000       EURO           19/12/2008
Option            Purchased   -270                   6,400.0000       EURO           19/12/2008
Option            Purchased   -350                   7,000.0000       EURO           19/12/2008
Option            Purchased   -350                   5,000.0000       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