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               28 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      49,610,883      4.97%     1,023,911      0.10%
securities
(2) Derivatives    2,356,705      0.24%       130,392      0.01%
(other than
options)
(3) Options and      202,100       0.02%      700,800      0.07%
agreements to
purchase/sell
Total             52,169,688       5.23%     1,855,103     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      2,219                53.8149
Purchase      9,391                53.8747
Purchase      6,792                53.7000
Purchase      11,100               53.3237
Purchase      53,774               53.7174
Purchase      3,606                53.7000
Purchase      3,488                54.0946
Purchase      3,577                53.6719
Purchase      2,584                53.7806
Purchase      37,000               53.7131
Purchase      70,283               53.7563
Purchase      53,774               53.7174
Purchase      78                   53.8191
Purchase      45,813               53.7250
Purchase      8,237                53.6330
Purchase      1,842                53.7000
Purchase      1,800                53.5491
Purchase      37,00                53.7131
Purchase      67                   53.5550
Purchase      8,237                53.6330
Sale          3,606                53.6903
Sale          8,237                53.6330
Sale          7,886                53.7000
Sale          2,219                53.8095
Sale          11,100               53.3237
Sale          2,584                53.7752
Sale          144                  53.3150
Sale          350                  53.6425
Sale          3,488                54.0897
Sale          37,000               53.7131
Sale          150                  53.3925
Sale          78                   53.8110
Sale          11,100               53.3237
Sale          3,577                53.6671
Sale          9,391                53.8747
Sale          100                  53.2425
Sale          70,283               53.7563
Sale          400                  54.0200
Sale          9,391                53.8747
Sale          1,800                53.5411
Sale          45,813               53.7250
Sale          400                  54.0200
Sale          53,774               53.7174
Sale          100                  53.5375
Sale          1,123                53.7000


NB: The below transactions which were previously disclosed have been cancelled
Deal Date    Purchase/Sale    Number of Securities    Price per unit (GBP)
24/12/2007   Sale             134                     53.2419

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         1798          53.4534
CFD            Short         1800          53.5491
CFD            Short         8237          53.6329
CFD            Short         45813         53.7249
CFD            Short         2584          53.7805
CFD            Short         1779          53.8927
CFD            Long          5400          52.7293
CFD            Long          3606          53.6903
CFD            Long          2219          53.8095
CFD            Long          78            53.811
CFD            Long          225           53.9451
CFD            Long          10690         54.0394
CFD            Long          3263          54.0996


NB: The below transactions which were previously disclosed have been cancelled
Deal Date    Long/Short    Number of Securities    Price per unit (GBP)
27/12/2007   Short         10,690                  54.0394
24/12/2007   Long          134                     53.2419
24/12/2007   Long          5,400                   52.7293

(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                         31 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