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               21 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      49,651,414      4.98%       980,816      0.10%
securities
(2) Derivatives    2,271,716      0.23%       144,847      0.01%
(other than
options)
(3) Options and      202,100      0.02%       700,800      0.07%
agreements to
purchase/sell
Total             52,125,230      5.23%     1,826,463      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      3,787                52.2392
Purchase      20,376               52.7800
Purchase      700                  52.7900
Purchase      8,602                52.7800
Purchase      84,850               53.3662
Purchase      500,000              52.0000
Purchase      11,505               52.4531
Purchase      572                  52.7800
Purchase      80,200               52.1021
Purchase      527                  52.1493
Purchase      306,000              48.0000
Purchase      319                  52.7800
Purchase      176,000              52.6620
Purchase      14,046               52.0000
Purchase      13,584               52.7800
Purchase      838                  52.6908
Purchase      72,007               52.0000
Purchase      80,200               52.1021
Purchase      32,937               51.8905
Purchase      198                  52.7800
Purchase      45                   52.7800
Purchase      1,978                52.7800
Purchase      1,900                51.9244
Purchase      14,016               51.3000
Purchase      22,200               51.7036
Purchase      250,000              33.0000
Purchase      296                  52.7800
Purchase      283                  52.7800
Purchase      602                  52.7800
Purchase      10,732               52.7800
Purchase      57,000               57.9100
Purchase      27,027               52.2029
Purchase      250,000              45.0000
Purchase      3,787                52.2392
Purchase      2,819                52.0220
Purchase      211,538              52.0000
Purchase      57,961               52.0000
Purchase      1,195                52.7800
Purchase      769                  52.7800
Purchase      35,436               52.3849
Purchase      19,230               52.3483
Purchase      1,600                52.7800
Purchase      5,438                52.7800
Purchase      1,900                51.9244
Purchase      2,263                51.9572
Purchase      232                  52.7800
Purchase      3,092                52.7800
Purchase      10                   52.7800
Purchase      8,813                52.3832
Purchase      803                  52.2415
Purchase      450,000              35.0000
Purchase      9,920                52.2377
Sale          105                  52.1324
Sale          2,200                51.7200
Sale          700                  52.7800
Sale          1,600                52.7721
Sale          32                   Transfer
Sale          80,200               52.1021
Sale          369                  51.8600
Sale          838                  52.6861
Sale          803                  52.2368
Sale          602                  52.7800
Sale          500,000              44.0000
Sale          100                  52.0750
Sale          19,230               52.3388
Sale          8,813                52.3738
Sale          1,400                51.7200
Sale          11,505               52.4478
Sale          117,260              52.7800
Sale          51                   52.3475
Sale          316                  51.3100
Sale          2,819                52.0220
Sale          1,900                51.9244
Sale          333                  52.3500
Sale          200                  52.3175
Sale          4,564                52.7800
Sale          2,263                51.9572
Sale          200                  51.9912
Sale          60                   52.0000
Sale          32,937               51.8905
Sale          3,787                52.2392
Sale          201,621              52.5479
Sale          35,436               52.3849
Sale          60                   52.4237
Sale          22,200               51.7036
Sale          57,961               52.0000
Sale          40                   52.0533
Sale          35,436               52.3849
Sale          27,027               52.2029
Sale          110                  52.0020
Sale          527                  52.1493
Sale          39                   50.6925
Sale          130                  51.9200
Sale          500                  52.1750
Sale          527                  52.1493
Sale          14,046               52.0000
Sale          176                  52.7800
Sale          9,920                52.2298
Sale          176,000              52.6620
Sale          84,850               53.3662
Sale          493                  52.7800
Sale          200                  51.9300
Sale          319                  52.7800
Sale          11,092               52.7800
Sale          50                   51.6360
Sale          150                  52.1950

NB: The below transactions which were previously disclosed have been cancelled
Deal Date  Purchase/Sale Number of Securities Price per unit (GBP)
10/12/2007 Purchase      57,000               57.9100


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         32937         51.8904
CFD            Short         1900          51.9244
CFD            Short         27027         52.2029
CFD            Short         9920          52.2376
CFD            Short         3787          52.2391
CFD            Short         803           52.2415
CFD            Short         8813          52.3832
CFD            Short         700           52.79
CFD            Long          2263          51.9571
CFD            Long          527           52.1492
CFD            Long          19230         52.3388
CFD            Long          11505         52.4478
CFD            Long          838           52.686
CFD            Long          1600          52.772


(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                         24 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                    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   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