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               31 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      45,961,075      4.61%     2,166,935      0.22%
securities
(2) Derivatives    2,894,889      0.29%        72,378      0.01%
(other than
options)
(3) Options and      141,450      0.01%       100,830      0.01%
agreements to
purchase/sell
Total             48,997,414      4.91%      2,340,143     0.23%


(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      700                   52.3986
Purchase      16,226                52.3300
Purchase      8,106                 52.3300
Purchase      2,547                 52.3300
Purchase      175                   52.3700
Purchase      3,235                 52.3300
Purchase      21,187                52.3300
Purchase      130                   52.0968
Purchase      581                   52.3300
Purchase      7,346                 52.3300
Purchase      7,346                 52.3300
Purchase      1,926                 52.3300
Purchase      3,998                 52.3300
Purchase      9,000                 51.3500
Purchase      8,348                 51.6880
Purchase      1,216                 52.2518
Purchase      1,936                 52.0511
Purchase      38                    Transfer
Purchase      42                    52.2300
Purchase      40                    64.5600 EUR
Purchase      912                   52.2631
Purchase      820                   51.7709
Purchase      15,300                51.3500
Purchase      6,693                 52.3300
Purchase      522                   51.1000
Purchase      2,315                 51.1000
Purchase      378                   52.3300
Sale          200                   52.3908
Sale          140                   52.3400
Sale          212                   51.0800
Sale          205                   52.2300
Sale          529                   51.9547
Sale          75                    51.2320
Sale          55,832                51.4595
Sale          70                    51.2100
Sale          250                   52.1700
Sale          100                   52.1860
Sale          180                   51.5000
Sale          118                   Transfer
Sale          42                    52.1000
Sale          76                    Transfer
Sale          3,900                 Transfer
Sale          140                   51.8500
Sale          400                   52.2022
Sale          115                   50.9100
Sale          4                     65.6800 EUR
Sale          50                    65.0000 EUR
Sale          7,266                 51.3500
Sale          150                   66.0000 EUR
Sale          225                   52.0000
Sale          196                   52.2300
Sale          2,400                 52.0150
Sale          65                    51.3000
Sale          38                    Transfer
Sale          174                   52.4000
Sale          230                   52.3000
Sale          10,756                52.1411
Sale          100                   52.0500
Sale          4,834                 52.0519
Sale          4,872                 51.8400
Sale          9,058                 51.9973
Sale          14,032                51.5369
Sale          212                   52.0200
Sale          9                     Transfer
Sale          3,004                 52.3300
Sale          50                    52.2412
Sale          250                   52.1900
Sale          1,124                 52.3300
Sale          175                   52.3624
Sale          300                   51.8000
Sale          130                   52.2216
Sale          50                    51.2636
Sale          100                   51.4500
Sale          100                   51.2636
Sale          150                   51.2524
Sale          3,998                 52.3300
Sale          378                   52.3300
Sale          120                   51.1400
Sale          7,346                 52.3300
Sale          80                    51.0420
Sale          300                   52.2300
Sale          175                   52.0900
Sale          200                   52.2100
Sale          263                   52.3300
Sale          130                   52.0112
Sale          81                    50.9123
Sale          200                   51.9720
Sale          100                   52.0748
Sale          125                   50.8300
Sale          100                   52.1532
Sale          100                   52.1532
Sale          6,548                 52.3300
Sale          195                   52.2300
Sale          200                   51.7900
Sale          523                   52.3300
Sale          13,000                52.3300
Sale          70                    52.2200
Sale          90                    52.3124
Sale          113                   52.3700
Sale          105                   52.2032
Sale          225                   52.2400
Sale          110                   52.2500

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          55832         51.4594
CFD            Long          14032         51.5368
CFD            Long          4872          51.84
CFD            Long          529           51.9546
CFD            Long          9058          51.9973
CFD            Long          4834          52.0519
CFD            Long          10756         52.141
CFD            Long          400           52.2021
CFD            Long          6523          52.3457
CFD            Short         8348          51.688
CFD            Short         820           51.7709
CFD            Short         1936          52.0511
CFD            Short         912           52.263
CFD            Short         700           52.3986

(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)
Call            Sell              85                 52        Euro            19/12/2008   .815
Call            Sell              50                 52        Euro            19/12/2008   .879
Put             Sell              50                 52        Euro            19/12/2008   .686
Put             Sell              85                 52        Euro            19/12/2008   .750

(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                         01 April 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   20,000                 52.0000          AMER           18/04/2008
Option            Purchased   20,000                 54.0000          AMER           18/04/2008
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   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   -135                   5,200.0000       EURO           19/12/2008
Option            Purchased   -145                   5,200.0000       EURO           19/12/2008
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