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 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      45,653,604      4.57%     2,283,952      0.23%
securities
(2) Derivatives    3,217,969      0.32%        52,205      0.01%
(other than
options)
(3) Options and      101,450      0.01%       101,080      0.01%
agreements to
purchase/sell
Total             48,973,023      4.91%     2,437,237      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         165                   61.3000
Purchase         32                    Transfer
Purchase         51                    Transfer
Purchase         20,330                60.2533
Purchase         400                   61.6400
Purchase         3,369                 61.2097
Purchase         35                    Transfer
Purchase         2                     Transfer
Purchase         12,858                61.4209
Purchase         58                    Transfer
Purchase         28,275                60.6775
Purchase         2,800                 61.0440
Purchase         55                    Transfer
Purchase         5,649                 61.1832
Purchase         249                   60.5791
Purchase         49                    Transfer
Purchase         40,000                61.0978
Purchase         40,000                61.0978
Purchase         100                   61.1601
Purchase         165                   61.3000
Purchase         341                   60.9998
Purchase         20,000                60.4000
Purchase         103                   Transfer
Purchase         19                    Transfer
Purchase         4,436                 61.2000
Purchase         3,261                 61.2000
Purchase         3,288                 61.2000
Purchase         45                    Transfer
Sale             100                   60.9805
Sale             100                   60.9805
Sale             15,102                61.3279
Sale             250                   60.9805
Sale             1,330                 60.3000
Sale             3,261                 61.2000
Sale             50                    60.8200
Sale             500                   60.9370
Sale             58                    Transfer
Sale             103                   Transfer
Sale             50                    61.2240
Sale             49,488                60.4310
Sale             36                    61.2990
Sale             45                    61.2620
Sale             3,369                 61.2097
Sale             3,369                 61.2097
Sale             1,350                 60.8900
Sale             1,303                 61.3300
Sale             35                    Transfer
Sale             165                   61.3015
Sale             1,700                 60.5048
Sale             17,430                61.2000
Sale             32                    Transfer
Sale             813                   60.6441
Sale             2,800                 61.0966
Sale             10,008                61.2000
Sale             50                    60.2006
Sale             42,534                61.2000
Sale             49                    Transfer
Sale             51                    Transfer
Sale             6,141                 60.9321
Sale             70                    61.5749
Sale             75                    61.6128
Sale             3,038                 60.7713
Sale             8,844                 61.1670
Sale             120                   61.0200
Sale             10,159                60.6312
Sale             100                   61.0200
Sale             108                   60.9300
Sale             60,239                60.9356
Sale             45                    Transfer
Sale             122                   61.6140
Sale             7                     60.3980
Sale             40,000                61.0978
Sale             100                   60.9805
Sale             528                   61.3772
Sale             125                   60.9805
Sale             150                   60.9805
Sale             50                    60.2006
Sale             120                   60.9805
Sale             55                    Transfer

NB: The below transactions which were previously disclosed have been cancelled
Deal Date  Purchase/Sale Number of Securities Price per unit (GBP)
18/04/2008 Sale          50                   60.2006



(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          49488         60.4309
CFD            Long          1575          60.5047
CFD            Long          125           60.5048
CFD            Long          10159         60.6311
CFD            Long          813           60.644
CFD            Long          6141          60.9321
CFD            Long          60239         60.9356
CFD            Long          2800          61.0965
CFD            Long          8844          61.1669
CFD            Long          15102         61.3279
CFD            Long          528           61.3771
CFD            Short         20330         60.2532
CFD            Short         249           60.579
CFD            Short         28275         60.6775
CFD            Short         341           60.9997
CFD            Short         2800          61.044
CFD            Short         40000         61.0977
CFD            Short         100           61.1601
CFD            Short         5649          61.1831
CFD            Short         165           61.3
CFD            Short         12858         61.4209
CFD            Short         400           61.64


(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                         21 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   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                   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