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 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      47,592,560      4.77%       315,140      0.03%
securities
(2) Derivatives      562,878      0.06%     1,763,654      0.18%
(other than
options)
(3) Options and      101,200      0.01%       276,998      0.03%
agreements to
purchase/sell
Total             48,256,638      4.83%     2,355,792      0.24%


(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         48,000                28.8800
Purchase         300                   28.0633
Purchase         2,510                 27.8692
Purchase         16,172                26.4780
Purchase         46,103                27.6742
Purchase         170,271               27.3108
Purchase         44,498                26.2700
Purchase         32,124                27.5254
Purchase         579                   27.5716
Purchase         27,573                27.0135
Purchase         2,500                 29.4975
Purchase         2,118                 28.6238
Purchase         16,760                27.5700
Purchase         7,943                 27.1349
Purchase         120,000               29.1700
Purchase         11,017                26.2700
Purchase         4,566                 28.7880
Purchase         13,883                27.4504
Purchase         22,135                26.4200
Purchase         734                   26.2700
Purchase         41,134                26.2700
Purchase         4,572                 26.2700
Purchase         473                   28.6122
Purchase         1,664                 26.2700
Purchase         14,976                26.2700
Purchase         16,640                27.5700
Purchase         2,496                 26.2700
Purchase         20,800                26.2700
Purchase         285                   26.2700
Purchase         330                   27.7100
Purchase         6,310                 26.6743
Purchase         641                   26.5500
Purchase         257                   26.2700
Purchase         51,003                27.9482
Purchase         4,079                 27.2341
Purchase         100                   33.6000 EUR
Purchase         50                    26.6000
Sale             3,600                 27.5458
Sale             26                    26.6200
Sale             300                   28.0633
Sale             8,600                 28.3254
Sale             41                    27.3600
Sale             105                   27.6900
Sale             1,887                 26.7032
Sale             16,293                28.0692
Sale             208                   29.0500
Sale             39                    27.2100
Sale             13,994                27.5820
Sale             54                    28.7153
Sale             543                   26.2700
Sale             140                   27.0300
Sale             924                   Transfer
Sale             28,508                27.1048
Sale             99,992                27.0503
Sale             47                    27.3300
Sale             5,000                 28.3923
Sale             1,905                 26.5005
Sale             23                    Transfer
Sale             31,805                27.5604
Sale             25                    Transfer
Sale             16,760                27.5700
Sale             45                    26.6700
Sale             120                   28.6800
Sale             29                    26.5400
Sale             2,100                 28.1400
Sale             16,640                27.7079
Sale             25                    27.3700


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          1905          26.5004
CFD            Long          1887          26.7032
CFD            Long          99992         27.0503
CFD            Long          28508         27.1048
CFD            Long          3600          27.5457
CFD            Long          31805         27.5604
CFD            Long          7353          27.769
CFD            Long          4690          27.7691
CFD            Long          12482         27.9401
CFD            Long          300           28.0633
CFD            Long          16293         28.0691
CFD            Long          8600          28.3254
CFD            Long          5000          28.3923
CFD            Long          54            28.7153
CFD            Long          208           29.05
CFD            Short         16172         26.478
CFD            Short         6310          26.6742
CFD            Short         27573         27.0134
CFD            Short         7943          27.1348
CFD            Short         1818          27.2922
CFD            Short         170271        27.3108
CFD            Short         13883         27.4503
CFD            Short         32124         27.5254
CFD            Short         579           27.5716
CFD            Short         46103         27.6741
CFD            Short         2510          27.8691
CFD            Short         51003         27.9482
CFD            Short         300           28.0633
CFD            Short         2118          28.6237
CFD            Short         48000         28.88
CFD            Short         120000        29.17

(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                         09 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   -125,000               45.0000          AMER           20/03/2009
Option            Purchased   100,000                56.0000          AMER           18/12/2009
Option            Purchased   -133                   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