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               12 March 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      47,021,508      4.71%     1,178,571      0.12%
securities
(2) Derivatives    2,425,336      0.24%        76,988      0.01%
(other than
options)
(3) Options and      146,650      0.01%       100,810      0.01%
agreements to
purchase/sell
Total             49,593,494      4.97%     1,356,369      0.14%


(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      31,357                54.4200
Purchase      100                   54.4400
Purchase      1,347                 54.4200
Purchase      56                    Transfer
Purchase      1,104                 54.4200
Purchase      300                   54.6100
Purchase      1,762                 Transfer
Purchase      100                   54.4300
Purchase      135                   54.5476
Purchase      68,004                54.3106
Purchase      411                   54.7437
Purchase      8,898                 54.3897
Purchase      1,091                 54.0621
Purchase      7,717                 54.3738
Purchase      4,176                 54.4200
Purchase      14,057                54.2662
Purchase      32                    Transfer
Purchase      1,054                 54.3170
Purchase      688                   54.6686
Sale          135                   54.4920
Sale          7,266                 54.2507
Sale          29                    54.2300
Sale          80                    54.2100
Sale          75                    54.3616
Sale          100                   54.3440
Sale          40                    54.1225
Sale          1,143                 54.6127
Sale          499                   54.0700
Sale          4,575                 54.4200
Sale          706                   54.7477
Sale          220                   Transfer
Sale          105                   54.1548
Sale          25                    54.2536
Sale          65                    54.3000
Sale          41                    54.5012
Sale          258                   54.4000
Sale          235                   54.3200
Sale          150                   54.1332
Sale          1,518                 54.4720
Sale          120                   53.8000
Sale          175                   54.3320
Sale          150                   54.4800
Sale          200                   54.4032
Sale          36                    Transfer
Sale          273                   Transfer
Sale          900                   54.5921
Sale          32                    Transfer
Sale          50                    54.3716
Sale          1,200                 54.3907
Sale          150                   54.3800
Sale          150                   54.0424
Sale          3,132                 54.4200
Sale          80                    54.0900
Sale          100                   54.3616
Sale          125                   54.4824
Sale          80                    54.5000
Sale          100                   54.4832
Sale          175                   54.1400
Sale          200                   54.3924
Sale          150                   54.4024
Sale          50                    54.4500
Sale          10,000                52.9700
Sale          217                   53.9900
Sale          1,100                 54.8800
Sale          7,797                 54.4235
Sale          115                   54.4400
Sale          3,269                 54.5300
Sale          500                   54.8469
Sale          1,400                 54.9357
Sale          75                    54.1700
Sale          235                   54.1700
Sale          40                    54.4025


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         1091          54.0621
CFD            Short         14057         54.2661
CFD            Short         68004         54.3105
CFD            Short         1054          54.317
CFD            Short         7717          54.3738
CFD            Short         8898          54.3897
CFD            Short         688           54.6685
CFD            Long          1200          54.3907
CFD            Long          7797          54.4235
CFD            Long          1518          54.4719
CFD            Long          1200          54.4968
CFD            Long          900           54.5921
CFD            Long          500           54.8469
CFD            Long          1100          54.88
CFD            Long          1400          54.9357


(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


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.

None


Is a Supplemental Form 8 attached? (Note 9)                 YES


Date of disclosure                         13 March 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   100,000                56.0000          AMER           18/12/2009
Option            Purchased   45,000                 54.0000          AMER           20/03/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   250                    3,000.0000       EURO           20/06/2008
Option            Purchased   250                    3,800.0000       EURO           20/06/2008
Option            Purchased   150                    4,000.0000       EURO           20/03/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   50                     5,400.0000       EURO           20/03/2008
Option            Purchased   -10                    5,200.0000       EURO           19/12/2008
Option            Purchased   -250                   2,500.0000       EURO           20/06/2008
Option            Purchased   -250                   5,200.0000       EURO           20/03/2008
Option            Purchased   -300                   3,800.0000       EURO           20/06/2008
Option            Purchased   -100,000               30.0000          AMER           20/06/2008



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