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               21 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      47,674,996      4.78%       571,933     0.06%
securities
(2) Derivatives      618,685      0.06%     2,069,315     0.21%
(other than
options)
(3) Options and      101,200      0.01%       276,978     0.03%
agreements to
purchase/sell
Total             48,394,881      4.85%     2,918,226     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         100,000               25.9342
Purchase         21,323                25.4737
Purchase         8,000                 25.7688
Purchase         200                   25.5800
Purchase         1,000                 25.3400
Purchase         349                   25.7200
Purchase         1,220                 26.1800
Purchase         168                   26.0000
Purchase         466                   26.3127
Purchase         938                   26.3128
Purchase         12,097                25.5857
Purchase         125,200               26.0518
Purchase         110,844               25.6977
Purchase         5,041                 25.6073
Purchase         20,976                25.6000
Purchase         349                   23.5690
Purchase         2,947                 26.1774
Purchase         18,942                25.7375
Purchase         13,400                24.9725
Purchase         364                   26.1800
Purchase         1,278                 25.7657
Purchase         4,568                 25.6000
Purchase         3,288                 26.1800
Sale             11,013                25.4728
Sale             30                    25.3320
Sale             13                    23.9730
Sale             125,200               26.0518
Sale             18,225                25.6941
Sale             158,779               25.7382
Sale             1,400                 25.4748
Sale             22                    Transfer
Sale             252                   25.7700
Sale             65                    25.5520
Sale             23,699                26.2113
Sale             4,968                 26.3639
Sale             600                   26.3000
Sale             300                   26.1500
Sale             1,013                 25.7589
Sale             513                   25.7589
Sale             1,427                 25.7589
Sale             591                   25.7589
Sale             2,216                 25.7589
Sale             1,055                 25.7589
Sale             938                   25.7589
Sale             436                   25.7589
Sale             811                   25.7589
Sale             290                   25.7589
Sale             45,258                25.8650
Sale             1,435                 25.7589
Sale             42                    Transfer
Sale             1,078                 25.7589
Sale             220                   25.6110
Sale             119                   25.8340
Sale             150                   25.2720
Sale             621                   25.7589
Sale             349                   23.5690
Sale             641                   Transfer
Sale             348,347               25.7563
Sale             76,026                26.0447
Sale             33,426                25.7655
Sale             983                   25.6000

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          11013         25.4728
CFD            Long          1400          25.4747
CFD            Long          18225         25.694
CFD            Long          158779        25.7381
CFD            Long          348347        25.7563
CFD            Long          33426         25.7654
CFD            Long          45258         25.8649
CFD            Long          76026         26.0447
CFD            Long          125200        26.0518
CFD            Long          23699         26.2113
CFD            Long          4968          26.3639
CFD            Short         13400         24.9724
CFD            Short         21323         25.4737
CFD            Short         12097         25.5856
CFD            Short         5041          25.6072
CFD            Short         110844        25.6976
CFD            Short         5719          25.7334
CFD            Short         22136         25.7335
CFD            Short         18942         25.7375
CFD            Short         100000        25.9342
CFD            Short         125200        26.0518

(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                         22 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   100,000                56.0000          AMER           18/12/2009
Option            Purchased   -50,000                64.0000          AMER           21/11/2008
Option            Purchased   -100,000               64.0000          AMER           21/11/2008
Option            Purchased   -125,000               45.0000          AMER           20/03/2009
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
Option            Purchased   -113                   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

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