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               13 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      47,338,519      4.75%    2,556,802       0.26%
securities
(2) Derivatives    2,439,195      0.24%      209,317       0.02%
(other than
options)
(3) Options and      204,131      0.02%    1,303,531       0.13%
agreements to
purchase/sell
Total             49,981,845      5.01%    4,069,650       0.41%


(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      4,429                52.9400
Purchase      381                  55.0483
Purchase      1,842                52.9400
Purchase      7,970                52.9400
Purchase      64,000               53.6454
Purchase      16,336               54.7646
Purchase      2,500                54.9176
Purchase      7,542                52.9400
Purchase      12,120               54.4183
Purchase      12,120               54.4183
Purchase      800                  52.8400
Purchase      1,300                53.1927
Purchase      3,103                52.9651
Purchase      85,879               54.5135
Purchase      3,315                52.9400
Purchase      3,188                52.9400
Purchase      3,304                53.2053
Sale          45                   55.8375
Sale          2,268                52.9400
Sale          3,864                52.9400
Sale          74                   54.5025
Sale          1,300                53.1927
Sale          220                  54.2325
Sale          70                   55.5976
Sale          11,100               55.3972
Sale          15,963               53.3627
Sale          60                   55.2600
Sale          12,120               54.4183
Sale          200                  56.0425
Sale          1,300                53.1927
Sale          55                   55.1225
Sale          100                  55.2675
Sale          145                  54.9725
Sale          3,503                52.9376
Sale          35                   55.0026
Sale          225                  55.1825
Sale          90                   55.0026
Sale          2,028                53.9296
Sale          120                  52.5700
Sale          200                  55.0275
Sale          20                   55.0950
Sale          80                   55.3550
Sale          4,174                54.3412
Sale          49                   54.5512
Sale          327                  52.9400
Sale          2,250                53.4577
Sale          100                  54.3600

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         3103          52.965
CFD            Short         3304          53.2053
CFD            Short         12120         54.4183
CFD            Short         85879         54.5135
CFD            Short         16336         54.7645
CFD            Short         2500          54.9176
CFD            Short         381           55.0482
CFD            Long          3503          52.9376
CFD            Long          1300          53.1927
CFD            Long          15963         53.3626
CFD            Long          2250          53.4577
CFD            Long          2028          53.9296
CFD            Long          4174          54.3412
CFD            Long          49           54.5512


(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                         14 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   -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   -600,000               42.0000          AMER           21/12/2007
Option            Purchased   100                    5,600.0000       EURO           18/01/2008
Option            Purchased   200,000                60.0000          AMER           18/01/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   250                    3,000.0000       EURO           20/06/2008
Option            Purchased   250                    3,300.0000       EURO           21/12/2007
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   250                    3,800.0000       EURO           20/06/2008
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   50                     5,400.0000       EURO           20/03/2008



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