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               09 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      45,834,028      4.59%     2,213,496      0.22%
securities
(2) Derivatives    3,019,215      0.30%        40,653      0.00%
(other than
options)
(3) Options and      141,450      0.01%       101,080      0.01%
agreements to
purchase/sell
Total             48,994,693      4.91%     2,355,229      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           30                  Transfer
Purchase           1,193               60
Purchase           382                 58.0228
Purchase           124                 57.96
Purchase           832                 58.0228
Purchase           2,135               58.0228
Purchase           714                 59.01
Purchase           606                 60
Purchase           23,241              60
Purchase           302                 58.0228
Purchase           1,600               59.5029
Purchase           6,457               59.3122
Purchase           13,387              59.7244
Purchase           4,800               59.4739
Purchase           2,300               60.3299
Purchase           490                 Transfer
Purchase           1,087               Transfer
Purchase           11,830              60
Purchase           468                 58.0228
Purchase           630                 58.0228
Purchase           186                 58.0228
Purchase           6,572               60.2387
Purchase           329                 58.0228
Sale               63                  58.17
Sale               180                 58.46
Sale               22,853              59.2747
Sale               113                 58.3224
Sale               92                  58.17
Sale               2,070               59.335
Sale               45                  58.4512
Sale               227                 58.52
Sale               15,309              58.7879
Sale               10,038              58.9601
Sale               167                 58.19
Sale               77                  59.05
Sale               13,476              59.1818
Sale               65                  58.2
Sale               163                 59.5224
Sale               86                  59.05
Sale               123                 59.8036
Sale               167                 59.47
Sale               1,978               57.8
Sale               8,000               60
Sale               206                 58.2
Sale               10                  58.1736
Sale               3,535               60
Sale               190                 59.8512
Sale               70                  59.102
Sale               250                 57.61
Sale               33                  75.8 EUR
Sale               25                  75 EUR
Sale               367                 58.0681
Sale               564                 58.0681
Sale               125                 59.61
Sale               85                  60.164
Sale               18                  58.45
Sale               74                  58.15
Sale               176                 58.0681
Sale               214                 58.17
Sale               150                 59.61
Sale               130                 59.61
Sale               206                 58.55
Sale               101                 58.52
Sale               45                  58.73
Sale               410                 58.67
Sale               95                  59.046
Sale               31,579              59.8646
Sale               18                  59.67
Sale               209                 58.2
Sale               1,356               58.8345
Sale               45                  59.28
Sale               65                  59.28
Sale               50                  59.6224
Sale               200                 59.79
Sale               60                  59.2532
Sale               200                 60.01
Sale               50                  59.66
Sale               100                 60.34
Sale               228                 59.71
Sale               200                 59.61
Sale               140                 59.61
Sale               200                 59.61
Sale               20                  59.66
Sale               50                  59.28
Sale               1,295               59.36
Sale               200                 60.01
Sale               55                  59.5
Sale               60                  59.62
Sale               150                 59.61
Sale               130                 59.8124
Sale               110                 59.1532
Sale               120                 59.05
Sale               350                 58.37
Sale               90                  59.4332
Sale               70                  58.26
Sale               75                  59.25
Sale               75                  60.46
Sale               100                 58.48
Sale               100                 59.2108
Sale               75                  60.01
Sale               85                  59.12
Sale               175                 60.01
Sale               24,640              59.6995
Sale               55                  59.28
Sale               200                 59.61
Sale               175                 59.61
Sale               100                 59.61
Sale               220                 59.61
Sale               125                 59.61
Sale               10                  59.3
Sale               150                 59.61
Sale               67                  58.13
Sale               1,975               58.3664
Sale               200                 59.71
Sale               75                  58.23
Sale               162                 58.17
Sale               189                 58.46
Sale               198                 59.61
Sale               100                 58.5232
Sale               65                  59.28
Sale               150                 59.61
Sale               100                 59.61
Sale               200                 59.61
Sale               100                 59.28
Sale               150                 59.61
Sale               150                 59.61
Sale               133                 58.21
Sale               200                 59.61
Sale               100                 59.51
Sale               60                  59.69
Sale               100                 58.62
Sale               90                  58.5224
Sale               50                  59.12
Sale               55                  59.29




(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          54            57.8674
CFD            Long          1975          58.3663
CFD            Long          10038         58.96
CFD            Long          13476         59.1818
CFD            Long          22853         59.2746
CFD            Long          24640         59.6995
CFD            Long          31579         59.8646
CFD            Short         6457          59.3121
CFD            Short         4800          59.4739
CFD            Short         1600          59.5029
CFD            Short         13387         59.7243
CFD            Short         6572          60.2386
CFD            Short         2300          60.3298


(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                         10 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                    3,800.0000       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                   5,200.0000       EURO           19/09/2008
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