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               12 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      46,913,134      4.70%     1,092,168      0.11%
securities
(2) Derivatives    2,889,354      0.29%        74,241      0.01%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,903,938      5.00%     1,307,489      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 Securities  Price per unit
                                       (GBP)
Purchase         140                   64.3475
Purchase         86                    63.6689
Purchase         1,604                 63.6632
Purchase         188                   63.4468
Purchase         1,138                 63.5139
Purchase         158                   63.4468
Purchase         228                   64.7200
Purchase         862                   63.6673
Purchase         5,746                 63.4472
Purchase         4,560                 63.5622
Purchase         3,270                 64.0900
Purchase         7,571                 64.0770
Purchase         3,632                 63.3807
Purchase         7,666                 63.9309
Purchase         800                   64.5695
Purchase         6,317                 63.6201
Purchase         1,200                 63.6099
Purchase         1,196                 63.4461
Purchase         2,007                 63.4469
Purchase         731                   63.4472
Purchase         3,738                 63.4472
Purchase         1,236                 63.4473
Purchase         436                   64.0900
Sale             604                   63.7576
Sale             26                    64.5560
Sale             65                    64.3300
Sale             6,445                 63.2873
Sale             31,329                63.5504
Sale             140                   64.3475
Sale             116                   63.5736
Sale             63                    64.2365
Sale             2,917                 63.6520
Sale             11                    64.0405
Sale             10,264                63.6492
Sale             26                    64.0105
Sale             1,180                 64.0804
Sale             6,388                 63.7112
Sale             12                    64.8490
Sale             150                   63.9200
Sale             65                    63.4660
Sale             50                    63.5500
Sale             40                    62.9300
Sale             250                   63.8560
Sale             476                   63.4300
Sale             50                    64.1950
Sale             33                    64.1900
Sale             100                   63.0500
Sale             120                   63.4075
Sale             100                   63.4075
Sale             100                   63.1924
Sale             70                    63.8644
Sale             14,148                63.4259
Sale             2,222                 63.4300
Sale             55                    63.4900
Sale             40                    63.2733
Sale             55                    63.3324
Sale             475                   63.3000
Sale             40                    63.3500
Sale             850                   62.9900
Sale             3,000                 62.9363
Sale             90                    63.2390
Sale             5,346                 62.9315
Sale             635                   64.9200
Sale             50                    64.0332



(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          5346          62.9315
CFD            Long          3000          62.9363
CFD            Long          6445          63.2873
CFD            Long          14148         63.4258
CFD            Long          31329         63.5503
CFD            Long          10264         63.6492
CFD            Long          2917          63.652
CFD            Long          6388          63.7112
CFD            Long          604           63.7576
CFD            Long          1180          64.0803
CFD            Short         3632          63.3806
CFD            Short         1138          63.5138
CFD            Short         4560          63.5622
CFD            Short         1200          63.6098
CFD            Short         6317          63.6201
CFD            Short         1604          63.6631
CFD            Short         862           63.6672
CFD            Short         7666          63.9309
CFD            Short         7571          64.077
CFD            Short         800           64.5695



(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                         13 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