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               02 April 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      45,758,277      4.59%     2,263,235      0.23%
securities
(2) Derivatives    2,982,859      0.30%        56,301      0.01%
(other than
options)
(3) Options and      141,450      0.01%       100,830      0.01%
agreements to
purchase/sell
Total             48,882,586      4.90%     2,420,366      0.24%


(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      3,600                 52.7900
Purchase      408                   Transfer
Purchase      75                    52.3980
Purchase      2,679                 53.5061
Purchase      888                   53.3295
Purchase      250                   52.4200
Purchase      189,626               53.0824
Purchase      1,814                 53.5421
Purchase      43,900                52.9949
Purchase      195                   52.4200
Purchase      68                    53.6000
Purchase      5,598                 53.4094
Purchase      298                   52.4200
Purchase      2,224                 53.6000
Purchase      188                   52.4200
Purchase      253                   53.5006
Purchase      7,000                 53.2119
Sale          80                    53.3400
Sale          70                    53.5700
Sale          94                    53.5200
Sale          100                   53.5600
Sale          70                    53.5116
Sale          80                    53.5600
Sale          125                   53.5400
Sale          70                    52.3600
Sale          100                   53.4300
Sale          40                    52.7400
Sale          50                    53.5600
Sale          100                   53.4708
Sale          110                   52.5512
Sale          300                   52.9000
Sale          40                    52.1300
Sale          425                   53.3700
Sale          100                   53.5200
Sale          200                   53.5400
Sale          75                    52.6200
Sale          109                   52.3400
Sale          45                    52.7516
Sale          1,700                 53.0730
Sale          253                   53.5000
Sale          130                   52.4000
Sale          590                   53.6000
Sale          7,055                 53.5920
Sale          7,366                 53.3279
Sale          200                   53.0730
Sale          8,375                 53.5660
Sale          150                   52.5848
Sale          18                    53.7100
Sale          3,355                 52.7923
Sale          55,564                53.5486
Sale          30                    51.2424
Sale          75                    52.7700
Sale          833                   52.2000
Sale          6,694                 53.6000
Sale          100                   53.2532
Sale          189                   52.7500
Sale          100                   52.5916
Sale          60                    52.6500
Sale          100                   53.5400
Sale          70                    52.6516
Sale          90                    52.5416
Sale          25                    53.5600
Sale          49                    52.6341
Sale          200                   52.4324
Sale          55                    52.6700
Sale          53                    53.0500
Sale          50                    53.6116
Sale          100                   53.5400
Sale          37                    52.5324
Sale          99                    53.4720
Sale          57                    53.4312
Sale          112                   53.1800
Sale          200                   53.6524
Sale          100                   53.5900
Sale          150                   51.7800
Sale          135                   53.0500
Sale          292                   53.1300
Sale          210                   53.3700
Sale          74                    52.9224
Sale          203                   52.6981
Sale          150                   52.7532
Sale          82                    53.5400
Sale          10,000                53.6000
Sale          75                    52.3600
Sale          4,043                 53.1289
Sale          125                   53.1816
Sale          350                   53.5600
Sale          300                   52.2200
Sale          160                   52.5000
Sale          100                   53.5224
Sale          403                   53.1289
Sale          150                   52.4000
Sale          180                   52.6048
Sale          140                   53.5300
Sale          125                   53.5416
Sale          400                   53.5300
Sale          109                   52.5316
Sale          60                    52.6100
Sale          50                    52.5100
Sale          400                   52.3800
Sale          175                   53.3600
Sale          59                    52.7441
Sale          100                   53.2700
Sale          45                    53.5200
Sale          70                    52.5596
Sale          20                    53.4900

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          3355          52.7922
CFD            Long          55564         53.5486
CFD            Long          8375          53.566
CFD            Long          7055          53.5919
CFD            Short         43900         52.9949
CFD            Short         189626        53.0823
CFD            Short         888           53.3294
CFD            Short         5598          53.4094
CFD            Short         2679          53.506

(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                         03 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                 54.0000          AMER           18/04/2008
Option            Purchased   20,000                 52.0000          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                    3,800.0000       EURO           20/06/2008
Option            Purchased   250                    3,000.0000       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