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               02 October 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      46,519,408       4.66%      952,775      0.10%
securities
(2) Derivatives    1,214,379       0.12%    1,854,150      0.19%
(other than
options)
(3) Options and      101,200       0.01%      152,000      0.02%
agreements to
purchase/sell
Total             47,834,987       4.79%    2,958,925      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         300                   34.9133
Purchase         2,340                 35.0053
Purchase         167,500               36.9943
Purchase         178,163               36.9943
Purchase         12,800                34.5802
Purchase         1,700                 34.5856
Purchase         41,123                32.8033
Purchase         1,957                 34.8692
Purchase         3,705                 34.0278
Purchase         2,232                 34.2050
Purchase         323                   32.1000
Purchase         54,392                32.9936
Purchase         521                   Transfer
Purchase         170                   34.3231
Purchase         2,868                 35.0512
Purchase         1,159                 34.8986
Purchase         274                   34.7000
Purchase         546                   32.1000
Purchase         546                   32.1000
Purchase         2,286                 32.1000
Purchase         200                   33.1500
Purchase         1,218                 32.1000
Purchase         288                   35.8545
Purchase         150                   32.1700
Sale             29                    34.3700
Sale             300                   34.9133
Sale             500                   35.2500
Sale             20                    35.0445
Sale             521                   Transfer
Sale             49                    35.1200
Sale             1,600                 34.3363
Sale             56                    Transfer
Sale             1,400                 35.3431
Sale             99                    34.9230
Sale             110                   35.9900
Sale             50                    34.1410
Sale             296                   32.1000
Sale             131                   Transfer
Sale             114,110               34.2866
Sale             46                    34.6810
Sale             23,575                33.9437
Sale             71,269                32.6990
Sale             13,800                32.7547
Sale             77                    35.9900
Sale             570                   34.5200
Sale             2,143                 32.1000
Sale             170                   35.7330
Sale             12,000                34.0614
Sale             34                    32.9450


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          71269         32.699
CFD            Long          13800         32.7546
CFD            Long          23575         33.9437
CFD            Long          12000         34.0614
CFD            Long          13716         34.1522
CFD            Long          1456          34.1972
CFD            Long          114110        34.2865
CFD            Long          1600          34.3363
CFD            Long          300           34.9133
CFD            Long          20            35.0445
CFD            Short         1265          32.1
CFD            Short         41123         32.8033
CFD            Short         54392         32.9936
CFD            Short         3705          34.0278
CFD            Short         1280          34.2802
CFD            Short         3662          34.4016
CFD            Short         12800         34.5802
CFD            Short         1700          34.5856
CFD            Short         1957          34.8691
CFD            Short         300           34.9133
CFD            Short         2340          35.0052
CFD            Short         8472          35.1215
CFD            Short         14314         35.7867
CFD            Short         178163        36.9942
CFD            Short         167500        36.9943

(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                         03 October 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   -50,000                64.0000          AMER           21/11/2008
Option            Purchased   -100,000               64.0000          AMER           21/11/2008
Option            Purchased   100,000                56.0000          AMER           18/12/2009
Option            Purchased   -135                   5,200.0000       EURO           19/12/2008
Option            Purchased   -145                   5,200.0000       EURO           19/12/2008
Option            Purchased   -270                   6,400.0000       EURO           19/12/2008
Option            Purchased   -300                   4,400.0000       EURO           19/12/2008
Option            Purchased   -300                   4,400.0000       EURO           19/12/2008
Option            Purchased   -350                   5,000.0000       EURO           19/12/2008
Option            Purchased   -500                   7,000.0000       EURO           19/12/2008
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

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