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               14 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      46,508,749      4.66%     1,643,694      0.16%
securities
(2) Derivatives    2,897,719      0.29%        84,782      0.01%
(other than
options)
(3) Options and      146,650      0.01%       100,810      0.01%
agreements to
purchase/sell
Total             49,553,118      4.97%     1,829,286      0.18%


(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      1,683                 55.2700
Purchase      1,049                 55.4417
Purchase      63                    55.1350
Purchase      186                   55.1350
Purchase      4,100                 55.3363
Purchase      6,829                 55.2700
Purchase      2,100                 55.1805
Purchase      13,571                53.3209
Purchase      273                   55.2700
Purchase      22,480                55.0576
Purchase      9,262                 54.0700
Purchase      9,251                 55.2700
Purchase      261                   55.1350
Purchase      50                    54.9000
Purchase      3,371                 55.3666
Purchase      392                   55.2700
Purchase      182                   55.2700
Purchase      2,341                 55.3238
Purchase      20,724                55.2700
Purchase      1,599                 55.0242
Purchase      212                   55.1350
Purchase      11                    54.0700
Sale          35                    55.4000
Sale          70                    55.7000
Sale          170                   55.7000
Sale          140                   55.1016
Sale          100                   55.5824
Sale          13,636                55.2700
Sale          102                   55.1621
Sale          18                    55.2700
Sale          6,829                 55.2700
Sale          17,655                55.2700
Sale          170                   55.7000
Sale          50                    55.0800
Sale          100                   55.1100
Sale          30                    55.7000
Sale          75                    55.0300
Sale          115                   55.7000
Sale          9,262                 54.0700
Sale          90                    55.7000
Sale          140                   55.7000
Sale          45                    55.7000
Sale          200                   55.9100
Sale          95                    55.7000
Sale          140                   55.7000
Sale          35                    55.0300
Sale          80                    54.8856
Sale          30                    55.7000
Sale          210                   55.7000
Sale          722                   55.1350
Sale          135                   54.9300
Sale          60                    55.1900
Sale          150                   55.4400
Sale          50                    55.0300
Sale          100                   55.7000
Sale          125                   55.0300
Sale          1,600                 55.0650
Sale          534                   55.2700
Sale          75                    55.0612
Sale          2,949                 55.3925
Sale          3,002                 55.2700
Sale          100                   55.7000
Sale          65                    54.7832
Sale          60,492                55.3324
Sale          40                    55.7000
Sale          100                   54.7956
Sale          100                   55.7000
Sale          21,100                55.1472
Sale          140                   55.7000
Sale          120                   55.1300
Sale          6,850                 55.0100
Sale          50                    55.7000
Sale          40                    55.1520
Sale          50                    55.2616
Sale          790                   55.1621
Sale          45                    55.7900
Sale          9,251                 55.2700
Sale          90                    55.1000
Sale          60                    55.1300
Sale          170                   55.7000
Sale          75                    55.2300
Sale          134                   55.7000
Sale          115                   55.2500
Sale          115                   55.1200
Sale          150                   55.0300
Sale          50                    55.0300
Sale          11                    54.0700
Sale          475                   55.0800
Sale          125                   55.2000
Sale          16,665                55.6570
Sale          50                    55.0300
Sale          111                   55.2700
Sale          40                    55.7000
Sale          130                   55.1924
Sale          425                   55.1100
Sale          18,652                55.2701
Sale          50                    55.2000
Sale          145                   71.7700 EUR
Sale          75                    55.7000
Sale          105                   55.0700
Sale          40                    55.5000
Sale          56                    55.1300
Sale          65                    54.9100
Sale          2,240                 55.2700
Sale          72                    55.7000
Sale          144                   55.2700
Sale          70                    55.7000
Sale          366                   55.1621
Sale          100                   55.7000


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         13571         53.3208
CFD            Short         1599          55.0241
CFD            Short         22480         55.0575
CFD            Short         2100          55.1805
CFD            Short         2341          55.3237
CFD            Short         4100          55.3363
CFD            Short         1049          55.4417
CFD            Long          200           54.771
CFD            Long          1600          55.065
CFD            Long          21100         55.1472
CFD            Long          18652         55.27
CFD            Long          60492         55.3323
CFD            Long          16665         55.6569


(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                         17 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