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               03 December 2007

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      46,410,776      4.65%     2,655,524      0.27%
securities
(2) Derivatives    5,643,188      0.57%     2,797,344      0.28%
(other than
options)
(3) Options and      204,131      0.02%     1,303,231      0.13%
agreements to
purchase/sell
Total             52,258,095      5.24%     6,756,099      0.68%


(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      241                  56.8899
Purchase      763                  54.4300
Purchase      10,433               54.4300
Purchase      700                  55.6992
Purchase      126,586              55.0627
Purchase      4,000                55.4349
Purchase      200                  54.7869
Purchase      167                  56.4000
Purchase      1,061                55.1660
Purchase      21,673               54.8463
Purchase      16,633               54.8221
Purchase      12,000               54.7047
Purchase      938                  54.4300
Purchase      699                  56.8899
Purchase      149                  56.8899
Purchase      606                  54.4300
Purchase      2,200                55.9936
Purchase      74,000               54.3787
Purchase      750                  54.5490
Purchase      14,530               55.0508
Purchase      14,530               55.0508
Purchase      216                  54.4300
Purchase      518                  54.4300
Purchase      18,810               54.5706
Purchase      136                  56.8899
Purchase      425                  54.4300
Purchase      700                  55.6992
Purchase      633                  54.4300
Sale          22                   56.9425
Sale          149                  56.8899
Sale          150                  54.4725
Sale          1,772                54.6741
Sale          241                  56.8899
Sale          699                  56.8899
Sale          60                   54.5225
Sale          14,530               55.0508
Sale          133                  56.6900
Sale          9,916                54.4300
Sale          40                   54.5225
Sale          177                  54.9500
Sale          1,708                56.4113
Sale          31                   54.7725
Sale          454                  Transfer
Sale          84                   54.5075
Sale          140                  56.6900
Sale          154                  56.4113
Sale          185                  56.6900
Sale          393                  56.6900
Sale          700                  55.6992
Sale          75,057               56.4000
Sale          961                  56.4113
Sale          136                  56.8899
Sale          130                  54.5225
Sale          2,554                56.4113
Sale          430                  56.4113
Sale          319                  56.4113
Sale          70                   54.9350
Sale          671                  56.4113
Sale          699                  55.9800
Sale          10,279               56.4113
Sale          126                  56.6900
Sale          360                  54.7375
Sale          70                   55.0650
Sale          69                   56.4113
Sale          763                  54.4300
Sale          43                   56.6100
Sale          338                  54.5350
Sale          100                  54.5225

(b)  Derivatives transactions (other than options)
Product name, Long/Short           Number of      Price per
(e.g. CFD)    (Note 6)             Securities     unit (GBP)
CFD           Short                725            54.4993
CFD           Short                750            54.549
CFD           Short                18810          54.5705
CFD           Short                200            54.7868
CFD           Short                15908          54.8368
CFD           Short                21673          54.8463
CFD           Short                14530          55.0507
CFD           Short                126586         55.0626
CFD           Short                4000           55.4349
CFD           Short                700            55.6992
CFD           Short                2200           55.9936
CFD           Long                 1772           54.674

(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                         04 December 2007
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   125                    4,400.0000       EURO            20/06/2008
Option            Purchased   -300,000               52.0000          AMER            15/02/2008
Option            Purchased   -300,000               56.0000          AMER            15/02/2008
Option            Purchased   -100,000               30.0000          AMER            20/06/2008
Option            Purchased   -1,000                 3,500.0000       EURO            21/12/2007
Option            Purchased   -500                   4,400.0000       EURO            21/12/2007
Option            Purchased   -350                   5,200.0000       EURO            21/12/2007
Option            Purchased   -306                   4,200.0000       EURO            21/12/2007
Option            Purchased   -300                   3,800.0000       EURO            20/06/2008
Option            Purchased   -275                   4,800.0000       EURO            21/12/2007
Option            Purchased   -250                   2,500.0000       EURO            20/06/2008
Option            Purchased   -250                   5,200.0000       EURO            20/03/2008
Option            Purchased   50                     5,400.0000       EURO            20/03/2008
Option            Purchased   -600,000               42.0000          AMER            21/12/2007
Option            Purchased   125                    4,400.0000       EURO            20/06/2008
Option            Purchased   200,000                60.0000          AMER            18/01/2008
Option            Purchased   250                    3,000.0000       EURO            20/06/2008
Option            Purchased   250                    3,300.0000       EURO            21/12/2007
Option            Purchased   250                    3,800.0000       EURO            20/06/2008
Option            Purchased   250                    4,500.0000       EURO            21/12/2007
Option            Purchased   250                    6,000.0000       EURO            15/02/2008
Option            Purchased   250                    6,000.0000       EURO            15/02/2008
Option            Purchased   275                    5,000.0000       EURO            21/12/2007
Option            Purchased   306                    4,800.0000       EURO            21/12/2007
Option            Purchased   350                    4,600.0000       EURO            19/12/2008
Option            Purchased   350                    4,600.0000       EURO            19/12/2008
Option            Purchased   450                    3,500.0000       EURO            21/12/2007
Option            Purchased   500                    5,200.0000       EURO            21/12/2007
Option            Purchased   100                    5,600.0000       EURO            18/01/2008

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