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               12 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      47,170,475      4.73%    2,650,378       0.27%
securities
(2) Derivatives    2,467,971      0.25%      143,737       0.01%
(other than
options)
(3) Options and      204,131      0.02%    1,303,531       0.13%
agreements to
purchase/sell
Total             49,842,577      5.00%    4,097,646       0.41%


(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      1,000                55.1626
Purchase      26,975               55.5888
Purchase      3,315                56.5700
Purchase      1,100                56.8829
Purchase      5,931                56.3633
Purchase      2,500                55.6748
Purchase      11,194               56.5700
Purchase      1,744                56.1182
Purchase      10,512               56.5700
Purchase      2,624                55.4954
Purchase      500                  56.1224
Purchase      2,500                55.6748
Purchase      927                  55.3900
Purchase      353                  55.7139
Purchase      6,000                55.5783
Purchase      383                  55.3900
Sale          1,994                55.8883
Sale          2,500                55.6748
Sale          1,100                56.8829
Sale          10,265               55.9624
Sale          16                   56.7175
Sale          1,000                56.5367
Sale          463                  55.1716
Sale          88                   55.7000
Sale          315,248              Transfer
Sale          33                   55.7550
Sale          1,100                56.8829
Sale          195                  56.6475
Sale          1,600                57.0622
Sale          3,504                Transfer
Sale          10,824               56.5710
Sale          66                   55.2330

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         1000          55.1626
CFD            Short         6000          55.5783
CFD            Short         26975         55.5888
CFD            Short         2500          55.6748
CFD            Short         1744          56.1182
CFD            Short         500           56.1224
CFD            Short         5931          56.3632
CFD            Long          463           55.1715
CFD            Long          66            55.233
CFD            Long          1994          55.8882
CFD            Long          10265         55.9623
CFD            Long          1000          56.5367
CFD            Long          10824         56.571
CFD            Long          1100          56.8829
CFD            Long          1600          57.0622


(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 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   -300                   6,000.0000       EURO           21/12/2007
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   -600,000               42.0000          AMER           21/12/2007
Option            Purchased   100                    5,600.0000       EURO           18/01/2008
Option            Purchased   200,000                60.0000          AMER           18/01/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
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   50                     5,400.0000       EURO           20/03/2008



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