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               31 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      49,603,088      4.97%     1,036,809      0.10%
securities
(2) Derivatives    2,352,603      0.24%       133,104      0.01%
(other than
options)
(3) Options and      202,100       0.02%      700,800      0.07%
agreements to
purchase/sell
Total             52,157,791       5.23%     1,870,713     0.19%


(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      16,359               53.1700
Purchase      4,292                53.0383
Purchase      6,136                53.0724
Purchase      1,592                53.0360
Purchase      11,022               53.0307
Purchase      12,391               53.2363
Purchase      5,517                53.1700
Purchase      13,276               53.1700
Purchase      7,480                53.1700
Purchase      1,142                53.0750
Purchase      2,121                53.1000
Purchase      4,886                52.9830
Purchase      486                  53.4000
Purchase      924                  52.9509
Purchase      2                    53.7000
Purchase      11,022               53.0307
Purchase      610                  53.1700
Purchase      17,000               53.1700
Purchase      248                  Transfer
Purchase      2,700                53.0396
Purchase      545                  53.1700
Purchase      1,142                53.0750
Purchase      310                  53.1700
Sale          4,292                53.0383
Sale          2,121                53.1000
Sale          2,071                53.1700
Sale          1,386                53.1700
Sale          134                  53.2419
Sale          25,897               53.1700
Sale          17,000               53.1700
Sale          2,700                53.0396
Sale          4,292                53.0383
Sale          592                  53.1700
Sale          40                   52.7825
Sale          924                  52.9509
Sale          19,121               53.1622
Sale          6,136                53.0724
Sale          924                  52.9509
Sale          1,592                53.0313
Sale          4,886                52.9782
Sale          9,323                53.1700
Sale          61                   53.0951
Sale          19                   53.0400
Sale          12,391               53.2363
Sale          2                    53.7000
Sale          930                  53.1700
Sale          11,022               53.0307
Sale          1,142                53.0750

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         249           52.9447
CFD            Short         4637          52.985
CFD            Short         6136          53.0724
CFD            Short         1142          53.075
CFD            Long          924           52.9508
CFD            Long          1361          53.0289
CFD            Long          2700          53.0396
CFD            Long          231           53.0452
CFD            Long          134           53.2419

(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                         01 January 2008
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   -100,000               30.0000          AMER           20/06/2008
Option            Purchased   -300                   3,800.0000       EURO           20/06/2008
Option            Purchased   -250                   5,200.0000       EURO           20/03/2008
Option            Purchased   -250                   2,500.0000       EURO           20/06/2008
Option            Purchased   50                     5,400.0000       EURO           20/03/2008
Option            Purchased   -300,000               56.0000          AMER           15/02/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   200,000                60.0000          AMER           18/01/2008
Option            Purchased   250                    6,000.0000       EURO           15/02/2008
Option            Purchased   250                    6,000.0000       EURO           15/02/2008
Option            Purchased   250                    3,800.0000       EURO           20/06/2008
Option            Purchased   250                    3,000.0000       EURO           20/06/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
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