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               05 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      47,114,190      4.72%     1,206,834      0.12%
securities
(2) Derivatives    2,417,030      0.24%       113,174      0.01%
(other than
options)
(3) Options and      146,650      0.01%       100,810      0.01%
agreements to
purchase/sell
Total             49,677,870     4.98%      1,420,818      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      44,250                56.5000
Purchase      503                   57.5499
Purchase      113,812               56.2900
Purchase      4,998                 57.5808
Purchase      36                    Transfer
Purchase      232                   57.5499
Purchase      1,000                 57.5499
Purchase      35                    71.5000 EUR
Purchase      110                   57.5499
Purchase      17,116                57.7610
Purchase      2,391                 57.4860
Purchase      8,191                 57.6146
Purchase      62                    57.5499
Purchase      30                    Transfer
Purchase      21,159                57.6469
Purchase      63                    57.5499
Purchase      1,915                 57.5499
Purchase      107                   57.5499
Purchase      900                   58.0000
Purchase      266                   56.5051
Purchase      482                   57.5499
Purchase      7,888                 58.0000
Purchase      144                   Transfer
Purchase      224                   58.0000
Purchase      105                   57.5499
Purchase      541                   57.4974
Purchase      400                   57.5987
Purchase      321                   57.5499
Purchase      17,641                57.6632
Purchase      243,372               56.6000
Sale          55                    56.5200
Sale          100                   57.3500
Sale          600                   56.8300
Sale          1,339                 57.3941
Sale          75                    56.6640
Sale          25                    57.2724
Sale          110                   57.1600
Sale          185                   56.5924
Sale          115                   57.3100
Sale          263                   57.2750
Sale          250                   57.5000
Sale          117                   57.0400
Sale          170                   57.7500
Sale          185                   56.6500
Sale          50                    57.6632
Sale          800                   57.6800
Sale          300                   56.5000
Sale          125                   57.2000
Sale          1,250                 57.8000
Sale          90                    56.8348
Sale          30                    56.9332
Sale          659                   56.5258
Sale          50                    57.1800
Sale          7,007                 57.1864
Sale          30                    Transfer
Sale          55                    57.0148
Sale          36                    Transfer
Sale          225                   56.5700
Sale          28                    56.9716
Sale          125                   57.0000
Sale          863                   57.4873
Sale          10,408                57.8927
Sale          2,766                 57.4657
Sale          150                   57.7500
Sale          10,000                57.5287
Sale          530                   57.2700
Sale          50                    57.0532
Sale          200                   56.5500
Sale          100                   56.7032
Sale          33                    74.8000 EUR
Sale          3,533                 57.4008
Sale          228                   57.7500
Sale          40                    57.3025
Sale          250                   56.6100
Sale          175                   57.7500
Sale          366                   57.5395


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         266           56.505
CFD            Short         541           57.4974
CFD            Short         4998          57.5808
CFD            Short         400           57.5986
CFD            Short         8191          57.6146
CFD            Short         21159         57.6469
CFD            Short         17641         57.6632
CFD            Short         17116         57.7609
CFD            Long          7007          57.1863
CFD            Long          3533          57.4008
CFD            Long          2766          57.4657
CFD            Long          863           57.4873
CFD            Long          366           57.5395
CFD            Long          800           57.68
CFD            Long          10408         57.8926


(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                         06 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