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 May 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      46,946,820      4.70%      1,056,222     0.11%
securities
(2) Derivatives    2,861,955      0.29%         84,704     0.01%
(other than
options)
(3) Options and      101,450      0.01%        141,080     0.01%
agreements to
purchase/sell
Total             49,910,225      5.00%      1,282,006     0.13%


(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           Price per unit
                   Securities          GBP)
Purchase           313                 64.0504
Purchase           1,030               64.0493
Purchase           234                 64.0497
Purchase           85                  64.1566
Purchase           254                 64.0497
Purchase           304                 64.0497
Purchase           442                 64.0497
Purchase           362                 64.0497
Purchase           342                 64.0497
Purchase           420                 64.0497
Purchase           10,967              63.8149
Purchase           118                 64.9
Purchase           596                 64.0497
Purchase           703                 64.0488
Purchase           8,970               64.0492
Purchase           213                 64.0507
Purchase           1,332               64.02
Purchase           4,275               64.02
Purchase           2,224               64.1279
Purchase           37                  Transfer
Purchase           7,344               64.0594
Purchase           44                  Transfer
Purchase           90                  Transfer
Purchase           7,300               64.2679
Purchase           67                  64.197
Purchase           80,000              64.5503
Purchase           14,000              64.9427
Purchase           12,021              64.119
Purchase           32                  Transfer
Purchase           2,120               64.0493
Purchase           635                 64.0487
Purchase           1,243               64.0492
Purchase           586                 64.0497
Purchase           6,116               63.6569
Purchase           1,803               64.0091
Purchase           3,028               64.0092
Purchase           1,100               64.0093
Purchase           5,642               64.0091
Purchase           1,868               64.0092
Purchase           8,674               64.0092
Purchase           8,409               64.02
Purchase           2,607               63.895
Purchase           243                 64.02
Purchase           850                 64.1722
Sale               650                 63.63
Sale               70                  64.8
Sale               72                  64.8
Sale               200                 64.8
Sale               40                  64.8
Sale               65                  64.8
Sale               120                 64.8
Sale               75                  64.8
Sale               100                 64.8
Sale               100                 64.8
Sale               71                  64.2275
Sale               400                 64.8
Sale               105                 64.8
Sale               230                 64.8
Sale               65                  64.8
Sale               140                 64.8
Sale               40                  64.8
Sale               55                  64.8
Sale               60                  64.8
Sale               70                  64.8
Sale               120                 64.8
Sale               300                 64.8
Sale               130                 64.8
Sale               120                 64.8
Sale               60                  64.8
Sale               30                  64.8
Sale               100                 64.8
Sale               105                 64.8
Sale               55                  64.8
Sale               55                  64.8
Sale               140                 64.8
Sale               4,000               64.02
Sale               13,296              64.2239
Sale               37                  Transfer
Sale               1,694               64.8115
Sale               37                  Transfer
Sale               8,931               64.8514
Sale               5,900               64.3641
Sale               70                  64.8
Sale               187                 63.876
Sale               2                   64.95
Sale               4,808               64.2815
Sale               105                 64.3045
Sale               23                  64.106
Sale               1,103               63.91
Sale               31,815              64.2195
Sale               16                  64.4375
Sale               27                  64.8865
Sale               39                  64.206
Sale               41                  64.1475
Sale               150                 64.8
Sale               90                  Transfer
Sale               70                  64.8
Sale               50                  64.8
Sale               160                 64.8
Sale               17                  64.2075
Sale               30,011              64.02
Sale               78                  65.0375
Sale               42                  64.32
Sale               44                  Transfer
Sale               8                   64.053
Sale               61,734              64.0378
Sale               61                  64.1005
Sale               40                  64.8
Sale               1,350               63.74
Sale               100                 64.8
Sale               60                  64.8
Sale               50                  64.8
Sale               130                 64.8
Sale               100                 64.8
Sale               65                  64.93
Sale               130                 64.8
Sale               280                 64.8
Sale               94                  64.93
Sale               88                  64.8
Sale               100                 64.8
Sale               95                  64.93
Sale               50                  64.93
Sale               158                 64.0575
Sale               80                  64.93
Sale               110                 64.93
Sale               113                 64.93
Sale               63                  64.93
Sale               130                 64.93
Sale               105                 64.8
Sale               130                 64.8
Sale               70                  64.8
Sale               120                 64.8
Sale               50                  64.8
Sale               88                  64.8
Sale               120                 64.8
Sale               60                  64.8
Sale               80                  64.93
Sale               45                  64.8
Sale               50                  64.8
Sale               120                 64.8
Sale               60                  64.8
Sale               26                  64.8
Sale               40                  64.8
Sale               80                  64.8
Sale               65                  64.8
Sale               83                  64.8
Sale               65                  64.93
Sale               60                  64.8
Sale               120                 64.8
Sale               90                  64.8
Sale               75                  63.6891
Sale               125,930             64.99
Sale               130                 64.8
Sale               62                  64.8
Sale               60                  64.8
Sale               73                  64.8
Sale               94                  64.93
Sale               67                  64.13
Sale               80                  64.8
Sale               140                 64.8
Sale               75                  64.8
Sale               85                  64.8
Sale               50                  64.8
Sale               80                  64.8
Sale               50                  64.8
Sale               140                 64.8
Sale               60                  64.8
Sale               95                  64.8
Sale               770                 64.93
Sale               50                  64.93
Sale               315                 64.93
Sale               160                 64.93
Sale               40                  64.8
Sale               65                  64.8
Sale               130                 64.8
Sale               100                 64.8
Sale               60                  64.8
Sale               1,200               64.8
Sale               40                  64.8
Sale               50                  64.8
Sale               70                  64.8
Sale               110                 64.8
Sale               55                  64.8
Sale               85                  64.8
Sale               80                  64.8
Sale               1,581               64.02
Sale               65                  64.8


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          8409          64.02
CFD            Long          61734         64.0377
CFD            Long          31815         64.2195
CFD            Long          13296         64.2238
CFD            Long          4808          64.2814
CFD            Long          5900          64.3641
CFD            Long          1694          64.8114
CFD            Long          8931          64.8513
CFD            Short         1950          63.6614
CFD            Short         10967         63.8148
CFD            Short         7344          64.0593
CFD            Short         12021         64.1189
CFD            Short         2224          64.1279
CFD            Short         7300          64.2679
CFD            Short         80000         64.5502

(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                         12 May 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