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               04 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      46,480,332      4.66%     2,632,420      0.26%
securities
(2) Derivatives    5,658,029      0.57%     2,954,842      0.30%
(other than
options)
(3) Options and      204,131      0.02%     1,303,231      0.13%
agreements to
purchase/sell
Total             52,342,492      5.25%     6,890,493      0.69%


(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      8,858                55.1500
Purchase      258                  54.7123
Purchase      856                  54.7123
Purchase      747                  54.7123
Purchase      17,316               55.1500
Purchase      22,200               54.4915
Purchase      18,784               54.5540
Purchase      17,520               55.1500
Purchase      161                  54.2400
Purchase      124,112              54.7299
Purchase      177                  54.7123
Purchase      269                  54.7123
Purchase      3,575                54.7299
Purchase      658                  54.7123
Purchase      5,769                54.5868
Purchase      314                  54.7123
Purchase      113                  54.5290
Purchase      205                  54.5200
Purchase      62,523               54.5200
Purchase      190                  54.7123
Purchase      5,927                54.8507
Purchase      4,562                54.8000
Purchase      4,000                54.6615
Purchase      205                  54.5700
Purchase      113                  54.5290
Purchase      1,759                54.7123
Sale          205                  54.5700
Sale          25,000               55.1500
Sale          50                   54.7400
Sale          120                  54.6537
Sale          17                   54.9525
Sale          150                  54.6000
Sale          101                  54.9900
Sale          3,105                54.6910
Sale          120                  54.5725
Sale          320                  54.3525
Sale          10,000               54.5975
Sale          140                  54.6875
Sale          73                   55.1500
Sale          170                  54.8650
Sale          62,523               54.5200
Sale          50                   54.8800
Sale          100                  55.1175
Sale          4,562                54.8000
Sale          3,926                54.7839
Sale          24,604               54.4300
Sale          43                   55.0500
Sale          62,523               54.5200
Sale          3,048                54.7879
Sale          113                  54.5290
Sale          200                  54.6232
Sale          444                  54.5912
Sale          753                  54.6325
Sale          62                   54.4925
Sale          100                  54.5775
Sale          28,993               56.3700

(b)  Derivatives transactions (other than options)
Product name, Long/Short           Number of      Price per
(e.g. CFD)    (Note 6)             Securities     unit (GBP)
CFD           Short                113            54.529
CFD           Short                18784          54.5539
CFD           Short                4000           54.6615
CFD           Short                124112         54.7298
CFD           Short                4562           54.8
CFD           Short                5927           54.8507
CFD           Long                 200            54.6231
CFD           Long                 3105           54.6909
CFD           Long                 3926           54.7839
CFD           Long                 3048           54.7879
CFD           Long                 4562           54.8

(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                         05 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                    6,000.0000       EURO           15/02/2008
Option            Purchased   250                    6,000.0000       EURO           15/02/2008
Option            Purchased   250                    4,500.0000       EURO           21/12/2007
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