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               17 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      48,343,023      4.82%       519,574     0.05%
securities
(2) Derivatives      768,621      0.08%     2,612,940     0.26%
(other than
options)
(3) Options and      101,200      0.01%       276,978     0.03%
agreements to
purchase/sell
Total             49,212,844      4.91%     3,409,492     0.34%


(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         32,479                20.6924
Purchase         77                    20.4800
Purchase         54,718                21.6031
Purchase         30                    21.5800
Purchase         918                   20.8337
Purchase         2,378                 20.2105
Purchase         62,851                20.8100
Purchase         76,053                21.8795
Purchase         19,200                20.5000
Purchase         28,199                21.1188
Purchase         200                   21.9700
Purchase         36,705                20.8072
Purchase         6,550                 20.6378
Purchase         9,560                 21.5800
Purchase         39                    20.5198
Purchase         33,435                21.0459
Purchase         71,666                21.8583
Purchase         2,208                 21.5036
Purchase         942                   21.0801
Purchase         12,148                22.5000
Purchase         200                   28.2700 EUR
Purchase         10,803                22.5000
Purchase         20,775                22.5000
Purchase         150,156               21.4213
Purchase         3,002                 22.5000
Purchase         432,988               21.1595
Purchase         7,951                 21.9600
Purchase         2,282                 22.5000
Purchase         495                   21.2397
Purchase         100                   19.6600
Purchase         880                   22.3900
Purchase         22,313                22.5000
Purchase         629                   22.5000
Sale             14                    23.5650
Sale             2,800                 20.8736
Sale             94,711                21.2582
Sale             45,325                21.6576
Sale             2,968                 21.3611
Sale             80,925                22.3154
Sale             19                    20.7810
Sale             293                   38.5900 USD
Sale             147                   22.0640
Sale             450                   20.5100
Sale             65                    20.6040
Sale             150                   21.2330
Sale             50                    20.6040
Sale             3,023                 20.3260
Sale             79                    21.3840
Sale             386                   38.5900 USD
Sale             65                    21.5172
Sale             386                   38.5900 USD
Sale             145,353               21.6386
Sale             200                   21.9700
Sale             27,930                21.1415
Sale             2,784                 21.4739
Sale             11,000                20.9695
Sale             342                   38.5900 USD

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          2800          20.8735
CFD            Long          27930         21.1415
CFD            Long          94711         21.2581
CFD            Long          2784          21.4738
CFD            Long          65            21.5172
CFD            Long          145353        21.6385
CFD            Long          45325         21.6576
CFD            Long          200           21.97
CFD            Long          80925         22.3153
CFD            Short         19200         20.5
CFD            Short         19871         20.5114
CFD            Short         6550          20.6378
CFD            Short         32479         20.6924
CFD            Short         36705         20.8072
CFD            Short         918           20.8337
CFD            Short         33435         21.0459
CFD            Short         28199         21.1187
CFD            Short         432988        21.1594
CFD            Short         150156        21.4212
CFD            Short         9441          21.4896
CFD            Short         2208          21.5036
CFD            Short         54718         21.6031
CFD            Short         71666         21.8582
CFD            Short         76053         21.8795
CFD            Short         200           21.97
CFD            Short         15275         22.5

(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                         20 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   -115                   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