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               18 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      46,494,462      4.66%     1,698,236      0.17%
securities
(2) Derivatives    2,971,861      0.30%        82,862      0.01%
(other than
options)
(3) Options and      186,650      0.02%       100,810      0.01%
agreements to
purchase/sell
Total             49,652,973      4.98%     1,881,908      0.19%


(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      250                   52.0600
Purchase      200                   52.2100
Purchase      10,861                51.9564
Purchase      555                   52.7300
Purchase      686                   51.6252
Purchase      8,764                 52.0876
Purchase      19                    51.9200
Purchase      744                   51.6252
Purchase      77                    Transfer
Purchase      7,504                 51.9534
Purchase      13,922                52.2053
Purchase      13,468                52.7300
Purchase      7,000                 52.7300
Purchase      22,066                51.8418
Purchase      896                   52.9073
Purchase      20                    51.6900
Purchase      1,600                 51.8855
Purchase      3,466                 52.3217
Purchase      2,900                 52.1907
Purchase      33                    52.1300
Purchase      6,400                 52.4506
Purchase      17,247                52.2589
Sale          275                   51.1700
Sale          185                   51.4000
Sale          5,060                 52.1346
Sale          100                   51.8600
Sale          50                    52.0400
Sale          100                   52.0500
Sale          110                   52.2500
Sale          29,700                52.1884
Sale          185                   52.8000
Sale          60                    52.2900
Sale          400                   51.5600
Sale          20,039                52.4150
Sale          100                   51.8500
Sale          17,247                51.6525
Sale          2,000                 52.0422
Sale          100                   52.7400
Sale          4,096                 52.7221
Sale          109                   51.4000
Sale          50                    52.2200
Sale          50                    52.1500
Sale          170                   51.4000
Sale          48                    52.4100
Sale          85                    52.2300
Sale          31                    52.1400
Sale          1,566                 52.7300
Sale          125                   51.4000
Sale          3,997                 52.2068
Sale          100                   51.4000
Sale          40                    51.4000
Sale          30                    51.3400
Sale          100                   51.5600
Sale          370                   51.9000
Sale          100                   52.1500
Sale          50                    52.1200
Sale          200                   52.2000
Sale          125                   51.8600
Sale          70                    51.4100
Sale          450                   52.2300
Sale          75                    51.6600
Sale          7,975                 52.1499
Sale          200                   52.2200
Sale          896                   52.9073
Sale          90                    51.8600
Sale          75,000                52.7200
Sale          75                    51.3200
Sale          30                    51.2300
Sale          38                    51.7100
Sale          896                   51.6900
Sale          425                   52.1501
Sale          100                   52.2000
Sale          125                   51.6400
Sale          115                   52.0000
Sale          180                   51.4000


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         22066         51.8418
CFD            Short         1600          51.8855
CFD            Short         7504          51.9533
CFD            Short         10861         51.9564
CFD            Short         2900          52.1907
CFD            Short         13922         52.2053
CFD            Short         17247         52.2588
CFD            Short         3466          52.3217
CFD            Short         6400          52.4505
CFD            Long          17247         51.6525
CFD            Long          2000          52.0421
CFD            Long          5060          52.1346
CFD            Long          29700         52.1884
CFD            Long          3997          52.2068
CFD            Long          450           52.23
CFD            Long          12859         52.2444
CFD            Long          20039         52.415
CFD            Long          75000         52.7199
CFD            Long          4096          52.722


(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                         19 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   250                    3,800.0000       EURO 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   -10                    5,200.0000       EURO 19/12/2008
Option            Purchased   50                     5,400.0000       EURO 20/03/2008
Option            Purchased   125                    4,400.0000       EURO 20/06/2008
Option            Purchased   -100,000               30.0000          AMER 20/06/2008
Option            Purchased   150                    4,000.0000       EURO 20/03/2008
Option            Purchased   100,000                56.0000          AMER 18/12/2009
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   20,000                 54.0000          AMER 18/04/2008
Option            Purchased   20,000                 52.0000          AMER 18/04/2008
Option            Purchased   45,000                 54.0000          AMER 20/03/2008
Option            Purchased   125                    4,400.0000       EURO 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