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               10 January 2008

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      50,277,489     5.04%       929,238       0.09%
securities
(2) Derivatives    2,342,283     0.23%       133,597       0.01%
(other than
options)
(3) Options and      202,500     0.02%        01,200       0.07%
agreements to
purchase/sell
Total              52,822,272    5.30%      1,764,035      0.18%



(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      2,910                50.4087
Purchase      6,792                50.2500
Purchase      50                   50.7484
Purchase      232                  51.1229
Purchase      11,100               50.8004
Purchase      236                  50.7300
Purchase      100                  50.3317
Purchase      2,042                50.9077
Purchase      40,059               50.7955
Purchase      466                  50.4629
Purchase      734                  50.4600
Purchase      33,342               50.8260
Purchase      189                  50.4600
Purchase      106                  50.8800
Purchase      1,102                50.7098
Purchase      2,885                50.2500
Purchase      934                  50.6180
Purchase      50                   50.7484
Purchase      765                  49.9714
Purchase      7,224                50.8277
Purchase      2,042                50.9077
Purchase      1,960                50.5076
Purchase      8,078                51.0692
Purchase      700                  50.1500
Purchase      1,395                50.9242
Purchase      2,680                50.3000
Purchase      20,252               50.8266
Purchase      3,436                50.6818
Purchase      2,896                50.6393
Purchase      2,043                50.2500
Purchase      617                  50.2905
Purchase      2,910                50.4087
Purchase      30,801               50.7766
Purchase      527                  50.0681
Purchase      40,059               50.7955
Purchase      527                  50.0681
Purchase      695                  50.2500
Purchase      11,100               50.8004
Sale          7,200                50.6399
Sale          2,896                50.6393
Sale          100                  50.3317
Sale          2,910                50.4087
Sale          679                  50.5522
Sale          40                   50.7600
Sale          220                  50.3850
Sale          2,042                50.9077
Sale          20,252               50.8266
Sale          527                  50.0681
Sale          33,342               50.8260
Sale          40,059               50.7955
Sale          100                  50.9825
Sale          115                  50.4400
Sale          10                   50.3620
Sale          3,436                50.6818
Sale          934                  50.6180
Sale          466                  50.4579
Sale          106                  50.8800
Sale          67                   50.7128
Sale          3,436                50.6818
Sale          1,102                50.7098
Sale          50                   50.7484
Sale          7,224                50.8231
Sale          11,100               50.8004
Sale          100                  50.3924
Sale          236                  50.7208
Sale          102                  50.5000
Sale          30,801               50.7766
Sale          1,960                50.5000
Sale          700                  50.1405
Sale          934                  50.6180
Sale          106                  50.8800
Sale          2,680                50.3000
Sale          123                  50.5428
Sale          100                  51.0350
Sale          100                  50.3317
Sale          617                  50.2905
Sale          3                    50.4824
Sale          617                  50.2905
Sale          952                  50.1832
Sale          232                  51.1178
Sale          1,395                50.9196
Sale          20,252               50.8266
Sale          8,078                51.0615

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         527           50.0681
CFD            Short         2910          50.4087
CFD            Short         466           50.4629
CFD            Short         1960          50.5075
CFD            Short         2896          50.6393
CFD            Short         50            50.7484
CFD            Short         33342         50.826
CFD            Short         2042          50.9076
CFD            Short         1395          50.9242
CFD            Long          700           50.1404
CFD            Long          617           50.2905
CFD            Long          2680          50.3
CFD            Long          100           50.3317
CFD            Long          934           50.6179
CFD            Long          3436          50.6817
CFD            Long          1102          50.7097
CFD            Long          236           50.7208
CFD            Long          5310          50.7898
CFD            Long          1914          50.9153
CFD            Long          8078          51.0615
CFD            Long          232           51.1177

(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                         11 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   -400                   5,600.0000       EURO           18/01/2008
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   -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                    3,800.0000       EURO           20/06/2008
Option            Purchased   250                    6,000.0000       EURO           15/02/2008
Option            Purchased   250                    6,000.0000       EURO           15/02/2008
Option            Purchased   250                    3,000.0000       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   500                    5,600.0000       EURO           15/02/2008
Option            Purchased   50                     5,400.0000       EURO           20/03/2008

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