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               19 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      47,870,130      4.80%    2,420,135       0.24%
securities
(2) Derivatives    2,285,767      0.23%      217,623       0.02%
(other than
options)
(3) Options and      204,131      0.02%    1,303,531       0.13%
agreements to
purchase/sell
Total             50,360,028      5.05%    3,941,289       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      3,626                50.9657
Purchase      500                  50.4200
Purchase      3,100                50.2046
Purchase      16,516               50.4700
Purchase      2,171                50.2682
Purchase      4,800                50.4623
Purchase      60                   50.3700
Purchase      1,800                50.9769
Purchase      3,872                50.7500
Purchase      163                  51.1000
Purchase      6,042                50.2363
Purchase      57,905               50.2220
Purchase      278                  51.1000
Purchase      57,946               50.6509
Purchase      57,946               50.6509
Purchase      1,500                50.4200
Purchase      169                  50.8834
Purchase      466                  50.8173
Purchase      588                  50.7500
Purchase      500                  50.4200
Purchase      500                  50.4200
Purchase      250                  50.4200
Purchase      76,856               50.2980
Purchase      330                  50.4200
Purchase      100                  50.4200
Purchase      6,042                50.2363
Purchase      424                  50.0685
Purchase      3,862                50.7500
Purchase      31,536               50.7500
Purchase      12,868               48.7378
Purchase      29,317               50.8127
Purchase      500                  50.4200
Purchase      3,626                50.9657
Purchase      21,234               50.5324
Purchase      279                  51.1000
Sale          57,946               50.6509
Sale          209                  50.3450
Sale          150                  50.3450
Sale          2,171                50.2636
Sale          95                   50.2100
Sale          29,317               50.8127
Sale          5,008                50.7500
Sale          70                   50.3450
Sale          130                  50.4075
Sale          200                  50.3850
Sale          3,626                50.9657
Sale          169                  50.8758
Sale          12,293               50.7500
Sale          21,234               50.5233
Sale          466                  50.8122
Sale          3,862                50.7500
Sale          76,856               50.2980
Sale          425                  50.1200
Sale          57,905               50.2220
Sale          735                  50.7500
Sale          16,516               50.4609
Sale          12,868               48.7378
Sale          424                  50.0635
Sale          60                   50.3928
Sale          3,100                50.2046
Sale          1,800                50.9723
Sale          160                  50.3450
Sale          76,856               50.2980
Sale          3,100                50.2046
Sale          6,042                50.2363
Sale          316                  50.7500
Sale          250                  50.3400
Sale          151                  50.7500
Sale          4,800                50.4547

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         424           50.0685
CFD            Short         2171          50.2681
CFD            Short         4800          50.4622
CFD            Short         21234         50.5323
CFD            Short         29317         50.8126
CFD            Short         3626          50.9657
CFD            Long          3100          50.2046
CFD            Long          57905         50.2219
CFD            Long          16516         50.4608
CFD            Long          466           50.8122
CFD            Long          169           50.8757
CFD            Long          1800          50.9722


(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                         20 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