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               04 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      46,669,115      4.68%     1,203,345      0.12%
securities
(2) Derivatives    2,423,541      0.24%        75,116      0.01%
(other than
options)
(3) Options and      146,650      0.01%       100,810      0.01%
agreements to
purchase/sell
Total             49,239,306      4.94%     1,379,271      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      233                   56.5881
Purchase      1,432                 56.2900
Purchase      5,200                 56.7595
Purchase      400                   55.9484
Purchase      60                    56.1783
Purchase      400                   56.6595
Purchase      9,720                 56.2900
Purchase      2,250                 56.4009
Purchase      31,002                56.7571
Purchase      10,800                56.6632
Purchase      722                   56.2167
Purchase      3,533                 56.2984
Purchase      42,300                57.2000
Purchase      1,284                 56.3996
Sale          174                   57.0200
Sale          30                    56.6000
Sale          250                   56.7100
Sale          225                   56.9100
Sale          129                   56.5600
Sale          300                   56.9100
Sale          3,871                 56.4064
Sale          251                   56.7331
Sale          175                   57.1140
Sale          100                   56.3900
Sale          205                   56.6400
Sale          3,396                 56.2900
Sale          50                    55.9356
Sale          34,046                56.4727
Sale          4,068                 56.6340
Sale          50                    56.6000
Sale          100                   56.5500
Sale          75                    56.3752
Sale          100                   56.5400
Sale          250                   56.5400
Sale          70                    56.6100
Sale          230                   57.2000
Sale          1,610                 56.3937
Sale          21,081                56.4125
Sale          222                   57.0400
Sale          80                    56.8943
Sale          35                    57.2940
Sale          628                   56.7015
Sale          65                    56.6132
Sale          43                    56.5900
Sale          20                    55.5300
Sale          2,798                 56.4894
Sale          67                    Transfer
Sale          100                   56.5400
Sale          100                   56.6936
Sale          85                    56.6100
Sale          80                    56.8533
Sale          200                   56.7100
Sale          50                    56.4000
Sale          205                   57.0200
Sale          111                   56.6900
Sale          100                   56.5400
Sale          175                   56.7424
Sale          100                   56.5400
Sale          145                   56.7112
Sale          125                   56.4632


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         400           55.9484
CFD            Short         722           56.2167
CFD            Short         3533          56.2984
CFD            Short         2250          56.4008
CFD            Short         400           56.6594
CFD            Short         10800         56.6631
CFD            Short         31002         56.7571
CFD            Short         5200          56.7595
CFD            Long          1610          56.3937
CFD            Long          3871          56.4063
CFD            Long          21081         56.4124
CFD            Long          34046         56.4727
CFD            Long          914           56.6051
CFD            Long          377           56.6198
CFD            Long          4068          56.6339
CFD            Long          628           56.7014
CFD            Long          80            56.8942


(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                         05 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