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               11 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      47,464,619      4.76%    2,673,216       0.27%
securities
(2) Derivatives    2,490,809      0.25%      149,237       0.01%
(other than
options)
(3) Options and      204,131      0.02%    1,303,531       0.13%
agreements to
purchase/sell
Total             50,159,559      5.03%    4,125,984       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      4,707                56.5889
Purchase      40,000               56.6581
Purchase      67                   Transfer
Purchase      7,970                56.8000
Purchase      125                  57.5387
Purchase      10,000               57.8400
Purchase      700                  56.1264
Purchase      3,372                56.8000
Purchase      8,858                56.8000
Purchase      169                  58.5000
Purchase      408                  56.4178
Purchase      8,124                56.8000
Purchase      179                  56.4178
Purchase      57,066               56.6207
Purchase      137                  57.5387
Purchase      127                  57.5387
Purchase      700                  56.1264
Purchase      175                  56.4178
Purchase      12,209               56.6564
Purchase      374                  56.9300
Purchase      173                  56.4178
Purchase      1,568                56.3500
Purchase      273                  56.1070
Purchase      320                  56.4178
Purchase      2,368                56.7322
Sale          225                  58.0000
Sale          6,231                56.5841
Sale          269                  56.8000
Sale          125                  57.5387
Sale          67                   Transfer
Sale          12,570               56.8000
Sale          21,544               56.7813
Sale          4,707                56.5889
Sale          8,124                56.8000
Sale          700                  56.1264
Sale          374                  56.9300
Sale          137                  57.5387
Sale          40                   57.8500
Sale          950                  56.6406
Sale          5,000                57.9700
Sale          70                   56.2576
Sale          50                   56.2400
Sale          70                   56.6726
Sale          188                  56.2232
Sale          40,000               56.6581
Sale          7,400                58.1431
Sale          25                   56.6350
Sale          127                  57.5387
Sale          100                  56.5724
Sale          227                  Transfer
Sale          26,214               56.7890
Sale          200                  57.1800
Sale          45                   57.2840
Sale          4,707                56.5889
Sale          270                  56.1225
Sale          140                  57.1800
Sale          40,000               56.6581
Sale          26,827               56.8000

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         273           56.1069
CFD            Short         700           56.1264
CFD            Short         1568          56.35
CFD            Short         123           56.6123
CFD            Short         57066         56.6206
CFD            Short         12209         56.6563
CFD            Short         600           56.6715
CFD            Short         1768          56.7527
CFD            Short         3488          56.8709
CFD            Short         782           56.9617
CFD            Long          6231          56.584
CFD            Long          4707          56.5888
CFD            Long          40000         56.6581
CFD            Long          43088         56.7813
CFD            Long          26214         56.789


(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                         12 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                    3,800.0000       EURO           20/06/2008
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   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