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               10 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      47,134,543      4.72%       828,927     0.08%
securities
(2) Derivatives    1,083,007      0.11%     1,899,096     0.19%
(other than
options)
(3) Options and      101,200      0.01%       276,998     0.03%
agreements to
purchase/sell
Total             48,318,750      4.84%     3,005,021     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         125                   25.5500
Purchase         300                   23.1700
Purchase         150                   23.9500
Purchase         150                   23.9500
Purchase         300                   23.9500
Purchase         657                   24.2400
Purchase         200                   23.9500
Purchase         120                   24.2400
Purchase         200                   23.9500
Purchase         26,198                23.5867
Purchase         500                   25.4100
Purchase         125                   23.9900
Purchase         400                   24.4000
Purchase         400                   24.3100
Purchase         1,290                 23.7000
Purchase         180                   24.5300
Purchase         175                   23.9500
Purchase         81,745                24.3623
Purchase         16,760                24.9600
Purchase         200                   24.2800
Purchase         2,000                 23.4355
Purchase         4,470                 23.7024
Purchase         58,661                24.2400
Purchase         1,159                 27.7954
Purchase         1,000                 23.8600
Purchase         629                   23.8100
Purchase         180                   23.9500
Purchase         6,357                 24.2853
Purchase         31,603                24.0749
Purchase         41,510                23.9952
Purchase         1,037                 24.6500
Purchase         110,672               24.6092
Purchase         3,714                 23.9733
Purchase         6,500                 24.6960
Purchase         1,142                 24.2400
Purchase         3,637                 24.2400
Purchase         1,802                 24.2400
Purchase         400                   23.9500
Purchase         125                   23.9300
Purchase         201                   24.2400
Purchase         38,638                24.2400
Purchase         1,267                 23.9656
Purchase         16,640                24.3400
Purchase         200                   23.7700
Purchase         250                   23.9500
Purchase         1,000                 25.4100
Purchase         175                   23.9500
Purchase         200                   25.4300
Purchase         4,568                 24.3381
Purchase         9,028                 23.9376
Purchase         1,400                 23.9000
Purchase         576                   24.2400
Purchase         300                   24.2300
Purchase         364                   24.2400
Purchase         2,754                 24.2400
Purchase         100                   24.1900
Sale             114                   23.9300
Sale             1,983                 24.2657
Sale             1,300                 24.6405
Sale             15,084                24.0559
Sale             12,678                24.1170
Sale             1,074                 24.5841
Sale             41,904                23.9874
Sale             42,235                24.2232
Sale             1,037                 24.6500
Sale             425                   24.1865
Sale             5,945                 24.8694
Sale             15,000                24.2400
Sale             16,640                24.4618
Sale             211                   Transfer
Sale             16,700                24.2631
Sale             15,000                24.5463
Sale             1,037                 24.6500
Sale             300                   23.0000
Sale             16,690                24.2400
Sale             23,366                24.2400
Sale             175                   23.9600
Sale             3,844                 24.2400
Sale             3,350                 24.2400
Sale             130                   24.0650
Sale             150                   24.0750
Sale             3,308                 24.2400
Sale             200                   23.4200
Sale             1,300                 24.1200
Sale             120                   24.2400
Sale             58,661                24.2400
Sale             32,535                24.1162
Sale             16,760                24.9600
Sale             200                   24.2800
Sale             18                    27.0200
Sale             35                    23.8781
Sale             60                    23.9900
Sale             37                    27.0500
Sale             210                   24.1600
Sale             70                    23.9400
Sale             602,293               24.7011
Sale             56                    Transfer
Sale             504                   24.2400
Sale             100                   23.3100



(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          35            23.878
CFD            Long          41904         23.9873
CFD            Long          32535         24.1162
CFD            Long          12678         24.1169
CFD            Long          1983          24.2656
CFD            Long          200           24.28
CFD            Long          15000         24.5463
CFD            Long          1074          24.584
CFD            Long          1300          24.6405
CFD            Long          602293        24.7011
CFD            Long          5945          24.8693
CFD            Short         2000          23.4355
CFD            Short         26198         23.5866
CFD            Short         4470          23.7024
CFD            Short         3714          23.9733
CFD            Short         41510         23.9951
CFD            Short         31603         24.0748
CFD            Short         8290          24.24
CFD            Short         200           24.28
CFD            Short         6357          24.2852
CFD            Short         81745         24.3623
CFD            Short         110672        24.6092
CFD            Short         6500          24.696



(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                         13 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