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               11 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      46,918,760      4.70%     1,244,781      0.12%
securities
(2) Derivatives    2,494,815      0.25%        59,373      0.01%
(other than
options)
(3) Options and      146,650      0.01%        100,810     0.01%
agreements to
purchase/sell
Total             49,560,225      4.97%      1,404,964     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      1,056                 52.5100
Purchase      40,870                52.2447
Purchase      444                   51.1000
Purchase      1,000                 52.3800
Purchase      2,413                 52.9334
Purchase      10,045                52.8470
Purchase      3,940                 52.9884
Purchase      1,104                 52.5100
Purchase      500                   52.7050
Purchase      13,657                51.9882
Purchase      6,000                 52.5100
Purchase      16,272                52.5477
Purchase      63                    Transfer
Purchase      109                   53.0400
Sale          113                   52.3500
Sale          255                   53.7500
Sale          75                    52.4700
Sale          62                    53.6500
Sale          7,704                 52.9804
Sale          12,204                52.7786
Sale          200                   53.1000
Sale          50                    52.5500
Sale          65                    52.9020
Sale          27,799                53.3497
Sale          16,272                52.5478
Sale          19                    53.7508
Sale          200                   52.5500
Sale          80                    52.6900
Sale          3,749                 52.9027
Sale          113                   52.5500
Sale          30                    52.5500
Sale          9,461                 52.9027
Sale          396                   52.9027
Sale          1,121                 52.9800
Sale          23                    52.8000
Sale          100                   52.9700
Sale          67                    53.5500
Sale          331                   52.9027
Sale          428                   52.9027
Sale          230                   52.7700
Sale          50                    52.7500
Sale          75                    52.5500
Sale          65                    52.2700
Sale          52                    52.7700
Sale          360                   Transfer
Sale          520                   52.9027
Sale          50                    52.5500
Sale          3,978                 52.6279
Sale          671                   52.9027
Sale          50                    52.5500
Sale          3,396                 52.5100
Sale          120                   52.5600
Sale          50                    52.5500
Sale          60                    52.5500
Sale          449                   52.9027
Sale          30                    52.5500
Sale          334                   52.9027
Sale          40                    53.2800
Sale          100                   52.2700
Sale          72                    52.5500
Sale          50                    52.5500
Sale          8,480                 53.3234
Sale          270                   52.4163
Sale          2,360                 52.8863
Sale          43                    53.6500
Sale          110                   52.5500
Sale          40                    52.5500
Sale          4,068                 51.8550
Sale          605                   52.9027
Sale          100                   53.0524
Sale          41                    53.2600
Sale          191                   52.7600
Sale          2,421                 52.9027
Sale          100                   52.5500
Sale          60                    53.2932
Sale          414                   52.9027
Sale          10,188                52.5100
Sale          5                     68.4000 EUR
Sale          175                   52.9800
Sale          879                   52.9027
Sale          1,258                 52.9027
Sale          173                   52.9800
Sale          35                    52.5500
Sale          1,933                 52.9027
Sale          226                   52.9027

NB: The below transactions which were previously disclosed have been cancelled
Deal Date     Purchase/Sale     Number of Securities    Price per unit (GBP)
03/03/2008    Sale              50                      55.6116

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         232           51.8844
CFD            Short         13657         51.9882
CFD            Short         40870         52.2446
CFD            Short         1000          52.38
CFD            Short         982           52.694
CFD            Short         10045         52.847
CFD            Short         2413          52.9333
CFD            Short         3940          52.9883
CFD            Long          3978          52.6279
CFD            Long          2360          52.8863
CFD            Long          1121          52.98
CFD            Long          7704          52.9804
CFD            Long          6288          53.0884
CFD            Long          8480          53.3233
CFD            Long          27799         53.3496

(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                         12 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                    3,800.0000       EURO 20/06/2008
Option            Purchased   250                    3,000.0000       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                   5,200.0000       EURO 20/03/2008
Option            Purchased   -250                   2,500.0000       EURO 20/06/2008
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