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               17 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      45,663,218      4.58%     2,303,270      0.23%
securities
(2) Derivatives    3,150,116      0.32%        28,999      0.00%
(other than
options)
(3) Options and      141,450      0.01%       101,080      0.01%
agreements to
purchase/sell
Total             48,954,784      4.91%     2,433,349      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           180                 62.5242
Purchase           1,400               62.1371
Purchase           6,141               61.4092
Purchase           461                 62.5242
Purchase           54,706              62.2212
Purchase           1,000               61.4092
Purchase           66                  Transfer
Purchase           7,500               61.4
Purchase           4,244               62.5242
Purchase           12,700              62.2182
Purchase           367                 62.9329
Purchase           524                 62.5242
Purchase           63,612              62.21
Purchase           594                 62.5242
Purchase           1,054               64
Purchase           193                 62.5242
Purchase           362                 62.5242
Purchase           11,314              61.4
Purchase           1,559               62.5242
Purchase           393                 62.5242
Purchase           253                 62.7364
Purchase           539                 62.5242
Purchase           417                 62.5242
Purchase           2,019               62.5242
Purchase           1,159               62.5242
Purchase           191                 62.5242
Purchase           215                 61.3
Purchase           39                  Transfer
Purchase           800                 62.139
Purchase           265                 61.4
Purchase           39,546              62.6292
Purchase           528                 62.9329
Purchase           30                  61.58
Purchase           60                  Transfer
Purchase           1,147               62.5242
Purchase           39,546              62.6292
Purchase           60                  Transfer
Purchase           1,220               63.67
Purchase           37,760              63.6734
Purchase           6,068               63.67
Purchase           271                 62.9329
Purchase           43,175              62.2585
Purchase           5,963               63.0192
Sale               150                 63.3
Sale               175                 63.3
Sale               320                 62.1
Sale               100                 62.1
Sale               200                 62.1
Sale               130                 62.1
Sale               240                 62.1
Sale               80                  62.1
Sale               100                 62.1
Sale               200                 62.1
Sale               40                  62.1
Sale               50                  62.1
Sale               80                  62.1
Sale               50                  63.3
Sale               275                 62.1
Sale               100                 62.1
Sale               50                  63.3
Sale               160                 62.1
Sale               50                  62.1
Sale               180                 62.1
Sale               50                  63.3
Sale               50                  62.1
Sale               300                 62.1
Sale               125                 62.1
Sale               80                  62.1
Sale               100                 63.3
Sale               200                 62.1
Sale               300                 62.1
Sale               100                 63.3
Sale               100                 63.3
Sale               200                 63.3
Sale               110                 62.1
Sale               200                 62.1
Sale               100                 62.1
Sale               200                 62.1
Sale               40                  62.1
Sale               50                  62.1
Sale               70                  62.1
Sale               150                 62.1
Sale               220                 62.1
Sale               250                 62.1
Sale               200                 62.1
Sale               80                  62.1
Sale               200                 62.1
Sale               170                 62.1
Sale               115                 62.1
Sale               200                 62.1
Sale               50                  63.3
Sale               240                 62.1
Sale               200                 62.1
Sale               230                 62.1
Sale               157                 62.1
Sale               200                 62.1
Sale               170                 63.3
Sale               170                 62.1
Sale               300                 62.1
Sale               150                 63.3
Sale               150                 62.1
Sale               100                 62.1
Sale               200                 62.1
Sale               80                  63.3
Sale               90                  63.3
Sale               200                 62.1
Sale               200                 62.1
Sale               200                 62.1
Sale               100                 62.1
Sale               50                  63.3
Sale               255                 63.3
Sale               150                 62.1
Sale               80                  62.1
Sale               200                 62.1
Sale               190                 62.1
Sale               150                 62.1
Sale               70                  62.1
Sale               50                  62.1
Sale               130                 62.1
Sale               150                 62.1
Sale               160                 63.1504
Sale               150                 62.398
Sale               41                  63.5329
Sale               33                  63.523
Sale               49                  63.5331
Sale               105                 63.34
Sale               65                  63.5231
Sale               150                 63.67
Sale               49                  63.5331
Sale               100                 63.2232
Sale               33                  63.533
Sale               160                 62.17
Sale               84                  63.56
Sale               33                  63.533
Sale               40                  63.53
Sale               150                 63.086
Sale               80                  62.1
Sale               100                 63.24
Sale               240                 62.1
Sale               100                 63.156
Sale               66                  Transfer
Sale               51                  62.1875
Sale               10,938              61.5146
Sale               15,194              63.5549
Sale               42,408              61.32
Sale               1,220               63.67
Sale               89                  63.6045
Sale               60                  Transfer
Sale               33                  63.533
Sale               32,618              62.9418
Sale               60                  63.22
Sale               60                  Transfer
Sale               1,200               62.3298
Sale               39                  Transfer
Sale               71,421              64.0608
Sale               215                 61.32
Sale               39,546              62.6308
Sale               2,131               62.4108
Sale               60                  63.086
Sale               246                 63.6746
Sale               70                  63.3
Sale               40                  63.086
Sale               170                 63.086
Sale               80                  63.3
Sale               85                  63.086
Sale               110                 63.223
Sale               50                  63.086
Sale               200                 62.1
Sale               250                 62.1
Sale               55                  62.1
Sale               100                 62.2308
Sale               245                 62.1
Sale               125                 62.1
Sale               40                  62.1
Sale               170                 63.3
Sale               50                  62.1
Sale               30                  62.1
Sale               80                  63.3
Sale               150                 62.1
Sale               60                  62.1
Sale               75                  63.35
Sale               55                  63.086
Sale               11,314              61.4
Sale               250                 63.712
Sale               300                 63.779
Sale               125                 63.3204
Sale               75                  63.086
Sale               40                  63.53
Sale               50                  62.1
Sale               76                  63.0861
Sale               80                  62.1
Sale               200                 64.47
Sale               1,150               64.47
Sale               600                 64.47
Sale               70                  63.48
Sale               150                 63.663
Sale               49                  63.5231
Sale               65                  63.5231
Sale               165                 63.086
Sale               75                  63.2008
Sale               100                 62.1
Sale               100                 62.1
Sale               145                 62.1
Sale               150                 63.3
Sale               100                 62.1
Sale               130                 63.3
Sale               500                 62.1
Sale               70                  63.3
Sale               50                  62.1
Sale               150                 62.1
Sale               60                  62.1
Sale               150                 62.1
Sale               196                 62.1
Sale               200                 62.1
Sale               150                 62.1
Sale               195                 62.1
Sale               80                  63.3
Sale               100                 62.1
Sale               130                 62.1
Sale               120                 62.1
Sale               95                  62.1
Sale               450                 62.1
Sale               100                 63.3
Sale               50                  62.1
Sale               300                 62.1
Sale               200                 62.1
Sale               120                 62.1
Sale               100                 62.1
Sale               70                  62.1
Sale               150                 62.1
Sale               75                  62.1
Sale               130                 62.1
Sale               200                 62.1
Sale               200                 62.1
Sale               110                 62.1
Sale               80                  62.1
Sale               150                 62.1
Sale               375                 62.1
Sale               90                  62.1
Sale               160                 62.1
Sale               250                 62.1
Sale               157                 62.1
Sale               120                 62.1
Sale               210                 62.1
Sale               150                 62.1
Sale               100                 62.1
Sale               139                 63.3
Sale               40                  62.1
Sale               220                 62.1
Sale               195                 62.1
Sale               48                  63.5329
Sale               170                 62.1
Sale               75                  62.1
Sale               80                  62.1
Sale               65                  63.5331
Sale               100                 62.1
Sale               120                 63.05
Sale               150                 62.22
Sale               100                 63.3
Sale               100                 62.1
Sale               50                  62.1
Sale               50                  62.9206
Sale               150                 62.1
Sale               270                 62.1
Sale               139                 61.4
Sale               100                 77.45 EUR
Sale               312                 62.7039
Sale               259                 62.7039
Sale               19,495              63.623
Sale               865                 62.7039
Sale               1,006               61.4
Sale               50                  63.4546
Sale               175                 61.24
Sale               50                  62.1
Sale               100                 62.1
Sale               70                  62.1
Sale               150                 62.1
Sale               100                 62.1
Sale               50                  62.1
Sale               49                  63.5331
Sale               150                 62.1
Sale               150                 62.1
Sale               200                 62.1
Sale               100                 62.1
Sale               130                 62.1
Sale               75                  62.1
Sale               150                 62.1
Sale               25                  63.53
Sale               80                  63.3
Sale               100                 63.3
Sale               100                 62.1
Sale               150                 62.1
Sale               80                  62.1
Sale               50                  63.3
Sale               185                 63.523
Sale               70                  62.1
Sale               100                 63.3
Sale               89                  62.1
Sale               100                 63.57
Sale               280                 62.1
Sale               60                  62.1
Sale               40                  62.1
Sale               2                   64.47
Sale               100                 63.3
Sale               80                  62.1
Sale               200                 63.5
Sale               150                 63.3
Sale               40                  63.086
Sale               150                 63.3
Sale               100                 63.3
Sale               170                 62.1
Sale               200                 62.1
Sale               180                 62.1
Sale               200                 62.1
Sale               55                  62.1
Sale               70                  62.1
Sale               130                 62.1
Sale               200                 62.1
Sale               205                 62.1
Sale               70                  63.3
Sale               50                  62.1
Sale               50                  63.3
Sale               80                  63.3
Sale               105                 63.3
Sale               140                 62.1
Sale               50                  62.1
Sale               145                 62.1
Sale               280                 62.1
Sale               100                 63.3
Sale               125                 63.3
Sale               50                  62.1
Sale               170                 62.1
Sale               40                  62.1
Sale               120                 62.1
Sale               180                 62.1
Sale               200                 62.1
Sale               165                 62.1
Sale               200                 62.1
Sale               100                 62.1
Sale               200                 62.1
Sale               40                  62.1
Sale               185                 62.1
Sale               50                  63.283
Sale               170                 62.1
Sale               550                 62.1
Sale               100                 62.1
Sale               70                  62.1
Sale               80                  62.1
Sale               70                  62.1
Sale               60                  62.1
Sale               250                 62.1
Sale               70                  62.1
Sale               200                 62.1
Sale               60                  62.1
Sale               250                 62.1
Sale               206                 62.1
Sale               50                  62.1
Sale               270                 62.1
Sale               40                  62.1
Sale               110                 62.1
Sale               150                 62.1
Sale               200                 62.1
Sale               200                 62.1
Sale               300                 62.1
Sale               60                  62.1
Sale               150                 62.1
Sale               130                 63.3
Sale               230                 62.1
Sale               310                 62.1
Sale               180                 62.1
Sale               200                 62.1
Sale               50                  62.1
Sale               219                 62.1
Sale               200                 62.1
Sale               150                 62.1
Sale               80                  62.1
Sale               200                 62.1
Sale               200                 62.1
Sale               130                 62.1
Sale               150                 62.1
Sale               115                 63.3
Sale               300                 62.1
Sale               80                  62.1
Sale               155                 62.1
Sale               70                  62.1
Sale               100                 62.1
Sale               150                 62.1
Sale               100                 62.1
Sale               110                 62.1
Sale               70                  62.1
Sale               200                 62.1
Sale               50                  62.1
Sale               70                  62.1





(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          10938         61.5146
CFD            Long          1200          62.3298
CFD            Long          2131          62.4108
CFD            Long          32618         62.9417
CFD            Long          15194         63.5548
CFD            Long          246           63.6745
CFD            Long          71421         64.0607
CFD            Short         7141          61.4092
CFD            Short         1400          62.1371
CFD            Short         800           62.139
CFD            Short         12700         62.2182
CFD            Short         54706         62.2212
CFD            Short         43175         62.2585
CFD            Short         39546         62.6291
CFD            Short         325           62.6926
CFD            Short         5963          63.0192
CFD            Short         37760         63.6733


(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                         18 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