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               18 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      47,861,768      4.80%    2,425,137       0.24%
securities
(2) Derivatives    2,290,769      0.23%      241,009       0.02%
(other than
options)
(3) Options and      204,131      0.02%    1,303,531       0.13%
agreements to
purchase/sell
Total             50,356,668      5.05%    3,969,677       0.40%


(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      40,053               50.5800
Purchase      469                  50.5702
Purchase      139,000              51.1708
Purchase      15,530               46.6430
Purchase      14,400               50.7286
Purchase      584                  49.9000
Purchase      85,785               50.6317
Purchase      311 50              .9537
Purchase      3,722                50.2601
Purchase      6,686                50.8406
Purchase      268                  50.9537
Purchase      38,838               50.9763
Purchase      15                   51.3175
Purchase      3,990                50.8335
Purchase      106                  50.6851
Purchase      38,437               50.4113
Purchase      55,037               50.7479
Purchase      23                   50.4850
Purchase      3,038                50.1975
Purchase      50,594               50.5800
Purchase      20,813               49.5344
Purchase      1,600                Transfer
Purchase      13,492               50.5800
Purchase      12,420               51.3219
Purchase      39,837               50.3969
Purchase      20,209               50.2180
Sale          2,655                51.0886
Sale          6,686                50.8355
Sale          80                   51.4275
Sale          55,037               50.7479
Sale          20,209               50.2180
Sale          3,990                50.8289
Sale          3,683                50.5800
Sale          40                   50.2375
Sale          15,530               46.6430
Sale          100                  49.3975
Sale          35                   Transfer
Sale          153                  50.8400
Sale          85,785               50.6317
Sale          108,582              50.6651
Sale          85,785               50.6317
Sale          28                   Transfer
Sale          40                   50.8400
Sale          106                  50.6800
Sale          50                   50.8400
Sale          38,838               50.9763
Sale          40,053               50.5800
Sale          562                  49.2700
Sale          200                  51.4275
Sale          3,722                50.2555
Sale          14,400               50.7210
Sale          200                  51.6628
Sale          20,813               49.5344
Sale          3,038                50.1900
Sale          38,437               50.4113
Sale          1,400                50.0000
Sale          12,420               51.3126
Sale          150                  50.7600
Sale          60                   51.4275
Sale          101                  Transfer
Sale          75                   49.4475
Sale          2,092                49.8079
Sale          300                  49.3150
Sale          13,492               50.5800
Sale          65                   49.3732

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         20209         50.2179
CFD            Short         3722          50.26
CFD            Short         469           50.5701
CFD            Short         106           50.685
CFD            Short         14400         50.7286
CFD            Long          20813         49.5343
CFD            Long          2092          49.8079
CFD            Long          3038          50.1899
CFD            Long          3990          50.8288
CFD            Long          6686          50.8355
CFD            Long          38838         50.9763
CFD            Long          2655          51.0885
CFD            Long          12420         51.3126


(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                         19 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   250                    3,300.0000       EURO 21/12/2007
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   50                     5,400.0000       EURO 20/03/2008
Option            Purchased   100                    5,600.0000       EURO 18/01/2008
Option            Purchased   125                    4,400.0000       EURO 20/06/2008
Option            Purchased   -100,000               30.0000          AMER 20/06/2008
Option            Purchased   250                    3,000.0000       EURO 20/06/2008
Option            Purchased   -300,000               56.0000          AMER 15/02/2008
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   200,000                60.0000          AMER 18/01/2008
Option            Purchased   -600,000               42.0000          AMER 21/12/2007
Option            Purchased   -300,000               52.0000          AMER 15/02/2008
Option            Purchased   125                    4,400.0000       EURO 20/06/2008



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