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               06 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      45,867,838      4.60%     2,658,735      0.27%
securities
(2) Derivatives    5,879,429      0.59%     3,103,260      0.31%
(other than
options)
(3) Options and      204,131      0.02%     1,303,231      0.13%
agreements to
purchase/sell
Total             51,951,398      5.21%     7,065,226      0.71%


(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      8,215                57.2000
Purchase      12,140               55.7663
Purchase      1,630                53.4246
Purchase      1,040                54.8865
Purchase      2,429                54.8865
Purchase      1,297                55.4850
Purchase      700                  56.1336
Purchase      1,500                Transfer
Purchase      100,211              55.7304
Purchase      118                  56.7100
Purchase      19,607               Transfer
Purchase      302                  56.2362
Purchase      12,140               55.7663
Purchase      27,000               55.8300
Purchase      966                  57.0200
Purchase      3,601                55.3399
Purchase      4,768                55.9022
Purchase      1,297                55.4850
Purchase      175,000              57.2000
Purchase      180                  56.2362
Purchase      358                  56.1942
Sale          1,297                55.4850
Sale          1,297                55.4850
Sale          12,140               55.7663
Sale          17,165               56.9781
Sale          65                   55.6025
Sale          9,858                55.5744
Sale          142                  56.0937
Sale          834                  56.1093
Sale          2,139                55.4508
Sale          11,100               56.1400
Sale          700                  56.1336
Sale          100                  56.1030
Sale          100                  55.0550
Sale          300                  55.6487
Sale          1,434                55.4508
Sale          118                  56.6547
Sale          1,681                55.4461
Sale          87,385               57.2000
Sale          235                  55.4050
Sale          125                  56.6075
Sale          25                   55.5875
Sale          4,800                55.4508
Sale          132                  55.0537
Sale          3,326                55.8994
Sale          700                  56.1336
Sale          4,293                56.1534
Sale          90                   56.3826
Sale          102                  56.1350
Sale          480                  56.7262
Sale          1,630                55.5500
Sale          100                  56.0825
Sale          118                  56.7100
Sale          8,215                57.2000
Sale          50                   55.4200
Sale          2,634                55.7879

(b)  Derivatives transactions (other than options)
Product name, Long/Short           Number of      Price per
(e.g. CFD)    (Note 6)             Securities     unit (GBP)
CFD           Short                3601           55.3399
CFD           Short                100211         55.7304
CFD           Short                12140          55.7662
CFD           Short                4768           55.9022
CFD           Long                 1681           55.446
CFD           Long                 3260           55.55
CFD           Long                 2634           55.7878
CFD           Long                 3326           55.8994
CFD           Long                 100            56.103
CFD           Long                 700            56.1336
CFD           Long                 4293           56.1533

(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                         07 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