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               27 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      49,555,561      4.97%    1,095,392       0.11%
securities
(2) Derivatives    2,391,186      0.24%      133,499       0.01%
(other than
options)
(3) Options and      202,100      0.02%      700,800       0.07%
agreements to
purchase/sell
Total             52,148,847      5.23%    1,929,691       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      235                  54.4700
Purchase      88,392               54.0441
Purchase      237                  53.9100
Purchase      3,801                54.5875
Purchase      9,460                53.9267
Purchase      7,384                53.9240
Purchase      2,252                54.0038
Purchase      4,006                53.8700
Purchase      3,906                53.8200
Purchase      10,690               54.0394
Purchase      97,137               54.0030
Purchase      229                  53.5582
Purchase      2,400                53.8147
Purchase      235                  53.1518
Purchase      10,690               54.0394
Purchase      7,384                53.9240
Purchase      2,732                53.9705
Purchase      77,135               53.9963
Purchase      5,162                53.8421
Purchase      555                  53.8200
Purchase      6,536                54.2742
Sale          6,536                54.2693
Sale          2,252                53.9984
Sale          229                  53.5582
Sale          88,392               54.0441
Sale          3,801                54.5875
Sale          35                   53.8443
Sale          750                  53.9375
Sale          3,906                53.8200
Sale          100                  54.0150
Sale          4,006                53.8603
Sale          35                   53.7126
Sale          77,135               53.9963
Sale          10,690               54.0394
Sale          97,137               54.0030
Sale          5,400                52.7293
Sale          235                  54.4700
Sale          383                  54.6192
Sale          3,801                54.5875
Sale          9,460                53.9213
Sale          134                  53.2419
Sale          2,400                53.8067
Sale          2,732                53.9657
Sale          237                  53.9100
Sale          235                  53.1518
Sale          97,137               54.0030
Sale          7,384                53.9240
Sale          120                  53.5825
Sale          555                  53.8200

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         1709          53.772
CFD            Short         2400          53.8147
CFD            Short         2252          54.0037
CFD            Short         10690         54.0394
CFD            Short         1023          54.3021
CFD            Long          5400          52.7293
CFD            Long          134           53.2419
CFD            Long          4006          53.8603
CFD            Long          9460          53.9213
CFD            Long          2131          53.9922
CFD            Long          77135         53.9962
CFD            Long          4405          54.4033


(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                         28 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   -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