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               22 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      45,761,013      4.59%     2,223,407      0.22%
securities
(2) Derivatives    3,241,952      0.32%        26,273      0.00%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,104,415      4.92%     2,390,760      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         819                   63.8500
Purchase         17,204                63.5394
Purchase         3,288                 63.8500
Purchase         2,372                 63.5599
Purchase         215                   63.4389
Purchase         102                   Transfer
Purchase         7,042                 63.8500
Purchase         6,068                 63.4821
Purchase         70,313                63.7993
Purchase         14,000                63.7000
Purchase         10,352                63.5813
Purchase         300                   63.6860
Purchase         894                   63.5233
Purchase         16                    63.3980
Purchase         2,500                 63.6721
Purchase         93                    Transfer
Purchase         3,693                 62.3700
Purchase         79                    62.5500
Purchase         43                    63.8500
Purchase         80,000                63.2373
Purchase         100                   63.4800
Purchase         1,600                 63.1324
Sale             2,400                 63.2155
Sale             102                   Transfer
Sale             42                    63.2600
Sale             12,654                63.7899
Sale             71,755                63.5124
Sale             3                     63.7075
Sale             22,027                63.3266
Sale             7,467                 62.6500
Sale             10                    61.9705
Sale             20,284                63.3386
Sale             195                   63.6400
Sale             93                    Transfer
Sale             40,000                61.0978
Sale             12                    62.0630
Sale             51                    61.6845
Sale             400                   63.2646
Sale             16                    63.5315
Sale             49,428                63.3831
Sale             650                   63.6860
Sale             1,283                 63.4350
Sale             1,557                 63.4407
Sale             69                    63.3300
Sale             110                   63.5020
Sale             50                    63.0132
Sale             300                   63.1360
Sale             50                    63.1448
Sale             100                   63.1360
Sale             115                   63.2736
Sale             75                    63.5000
Sale             8,053                 63.8500
Sale             175                   63.5045
Sale             80                    63.6545
Sale             160                   63.5830
Sale             108                   63.1760
Sale             115                   63.5090
Sale             100                   63.5530
Sale             150                   63.5730
Sale             200                   63.5416
Sale             200                   63.4990
Sale             40                    63.2605
Sale             819                   63.8500
Sale             7,042                 63.8500
Sale             6,659                 63.8500
Sale             3,693                 62.3700
Sale             50                    63.5016
Sale             594                   Transfer
Sale             450                   Transfer
Sale             80                    63.6030

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          40000         61.0977
CFD            Long          2400          63.2155
CFD            Long          400           63.2646
CFD            Long          22027         63.3265
CFD            Long          20284         63.3385
CFD            Long          49428         63.383
CFD            Long          71755         63.5123
CFD            Long          12654         63.7898
CFD            Short         1600          63.1323
CFD            Short         80000         63.2373
CFD            Short         6068          63.482
CFD            Short         894           63.5233
CFD            Short         17204         63.5394
CFD            Short         2372          63.5598
CFD            Short         10352         63.5812
CFD            Short         2500          63.672

(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            Purchase          40000               70       AMER             20/06/08    2.6775

(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                         23 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   -2,000                  70.0000         AMER           20/06/2008
Option            Purchased   -38,000                 70.0000         AMER           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