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               27 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      48,415,430     4.85%        668,924     0.07%
securities
(2) Derivatives      805,850     0.08%      2,133,455     0.21%
(other than
options)
(3) Options and      101,200     0.01%        276,959     0.03%
agreements to
purchase/sell
Total             49,322,480     4.94%      3,079,338     0.31%


(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         209                   21.5870
Purchase         400                   21.5050
Purchase         1,342                 21.3200
Purchase         15,600                21.3172
Purchase         2,285                 21.3200
Purchase         447                   21.6400
Purchase         37,286                22.4300
Purchase         3,889                 22.4300
Purchase         511                   20.9270
Purchase         2,939                 21.5446
Purchase         4,185                 21.6400
Purchase         326                   21.5683
Purchase         3,324                 22.4300
Purchase         256                   21.5878
Purchase         848                   21.3200
Purchase         375                   21.5346
Purchase         6,100                 22.4704
Purchase         194                   21.5878
Purchase         383                   21.5360
Purchase         1,437                 21.5497
Purchase         2,760                 21.5483
Purchase         57,411                21.1832
Purchase         1,184                 21.3651
Purchase         40,000                20.5881
Purchase         40,000                20.5881
Purchase         30,078                21.8789
Purchase         228                   21.5843
Purchase         216                   21.3633
Purchase         22,428                21.2546
Purchase         6,567                 21.4861
Purchase         774                   21.6400
Purchase         6,746                 21.0689
Purchase         10,803                22.4300
Purchase         21,626                21.7551
Purchase         680                   22.4300
Purchase         3,393                 22.4300
Purchase         2,262                 21.6400
Sale             294                   20.5709
Sale             22,428                21.2546
Sale             33                    20.8900
Sale             400                   21.9964
Sale             40,000                20.5881
Sale             307,142               21.3642
Sale             21,305                21.7439
Sale             16                    20.7720
Sale             510                   Transfer
Sale             1,230                 22.4300
Sale             400                   21.5050
Sale             16,011                20.7167
Sale             4,999                 21.6171
Sale             179,329               20.6538
Sale             72                    22.0000
Sale             40,910                21.4937
Sale             1,658                 22.2904
Sale             29,000                22.2746
Sale             96,713                22.3451
Sale             10                    20.9500
Sale             50                    25.1700 EUR
Sale             28,912                21.8487
Sale             21,600                22.4319
Sale             3,889                 22.4300

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          4223          20.545
CFD            Long          26552         20.5664
CFD            Long          294           20.5708
CFD            Long          771           20.5878
CFD            Long          179329        20.6538
CFD            Long          16011         20.7166
CFD            Long          22428         21.2546
CFD            Long          307142        21.3641
CFD            Long          40910         21.4937
CFD            Long          400           21.505
CFD            Long          4999          21.617
CFD            Long          21305         21.7439
CFD            Long          28912         21.8486
CFD            Long          2126          22.155
CFD            Long          29000         22.2746
CFD            Long          1658          22.2904
CFD            Long          96713         22.345
CFD            Long          21600         22.4318
CFD            Short         20667         20.5609
CFD            Short         40000         20.5881
CFD            Short         6746          21.0688
CFD            Short         57411         21.1831
CFD            Short         22428         21.2546
CFD            Short         15600         21.3171
CFD            Short         216           21.3632
CFD            Short         1184          21.365
CFD            Short         26312         21.4538
CFD            Short         10519         21.4573
CFD            Short         6567          21.4861
CFD            Short         400           21.505
CFD            Short         21626         21.755
CFD            Short         30078         21.8788
CFD            Short         6100          22.4704

(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                         28 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   -94                    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