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               28 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      48,273,454     4.84%        676,575     0.07%
securities
(2) Derivatives      791,166     0.08%      2,049,005     0.21%
(other than
options)
(3) Options and      101,200     0.01%        276,959     0.03%
agreements to
purchase/sell
Total             49,165,820     4.93%      3,002,539     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         756                   24.3563
Purchase         30                    28.0000 EUR
Purchase         250                   24.3700
Purchase         154                   22.5800
Purchase         13,200                22.5800
Purchase         5,528                 23.2116
Purchase         80,000                22.4300
Purchase         210                   24.5500
Purchase         26,400                23.9519
Purchase         93                    22.5800
Purchase         2,262                 23.5500
Purchase         1,001                 23.4792
Purchase         6,500                 23.7578
Purchase         464                   22.5800
Purchase         32,218                22.5800
Purchase         119,670               23.4181
Purchase         37,707                22.9885
Purchase         19,500                23.4332
Purchase         1,900                 23.3476
Purchase         11,453                23.4670
Purchase         2,000                 24.3036
Purchase         400                   23.0100
Purchase         634                   24.2863
Purchase         4,524                 22.5800
Sale             226                   Transfer
Sale             7,118                 24.1227
Sale             386                   22.0300
Sale             634                   24.2614
Sale             294                   22.0300
Sale             32,218                22.5800
Sale             22                    Transfer
Sale             1,000                 23.4746
Sale             2,447                 24.2548
Sale             6,484                 22.5800
Sale             35                    24.6169
Sale             93                    22.5800
Sale             135,255               23.6603
Sale             128                   23.7830
Sale             59                    24.2830
Sale             39,413                23.6014
Sale             342                   22.0300
Sale             1,784                 22.5800
Sale             6,500                 24.5183
Sale             64                    23.6820
Sale             220                   22.0300
Sale             32,157                22.5800
Sale             400                   23.0100
Sale             26,973                22.6276
Sale             405                   22.5800
Sale             1,429                 22.5800
Sale             683                   22.5800
Sale             9,165                 22.5800
Sale             13,735                22.5800
Sale             50                    24.4050
Sale             2,580                 22.5800
Sale             154                   22.5800
Sale             143                   Transfer
Sale             28,304                22.5800
Sale             1,248                 22.5800
Sale             448                   22.5800
Sale             223                   22.5800
Sale             2,230                 22.5800
Sale             23,087                23.8085
Sale             386                   22.0300
Sale             75                    24.4251
Sale             11,467                23.4192
Sale             38,008                23.3470
Sale             52                    Transfer
Sale             519                   22.5800

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          1095          22.58
CFD            Long          26973         22.6276
CFD            Long          400           23.01
CFD            Long          38008         23.3469
CFD            Long          17894         23.3866
CFD            Long          11467         23.4192
CFD            Long          578           23.4796
CFD            Long          874           23.4812
CFD            Long          8277          23.4851
CFD            Long          39413         23.6014
CFD            Long          4991          23.6564
CFD            Long          135255        23.6603
CFD            Long          7118          24.1227
CFD            Long          2447          24.2547
CFD            Long          634           24.2613
CFD            Long          6500          24.5182
CFD            Long          35            24.6168
CFD            Short         80000         22.43
CFD            Short         37707         22.9885
CFD            Short         400           23.01
CFD            Short         5528          23.2115
CFD            Short         1745          23.2733
CFD            Short         1900          23.3476
CFD            Short         119670        23.418
CFD            Short         19500         23.4331
CFD            Short         11453         23.467
CFD            Short         6500          23.7577
CFD            Short         26400         23.9519
CFD            Short         634           24.2862
CFD            Short         756           24.3563

(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                         29 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