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               08 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      47,053,851      4.71%     1,073,790      0.11%
securities
(2) Derivatives    2,866,705      0.29%       112,644      0.01%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             50,022,006      5.01%     1,327,514      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         336                   65.0000
Purchase         555                   65.0000
Purchase         5,020                 65.0372
Purchase         495                   64.4600
Purchase         12,816                64.9238
Purchase         67,508                64.3638
Purchase         4,792                 65.0000
Purchase         1,000                 64.9597
Purchase         158                   64.5700
Purchase         2                     63.5900
Purchase         15,670                65.0000
Purchase         19,641                65.0000
Purchase         424                   63.6512
Purchase         6,286                 64.7233
Purchase         15,551                64.5927
Purchase         586                   65.0000
Purchase         961                   63.9747
Purchase         47,628                64.5541
Purchase         11,775                64.8295
Purchase         495                   63.8330
Purchase         176                   64.4344
Purchase         582                   64.1552
Purchase         5,605                 65.0353
Purchase         211                   64.4274
Purchase         183                   64.4350
Purchase         378                   65.0000
Purchase         304                   64.4182
Purchase         619                   65.0000
Purchase         225                   64.4168
Purchase         10,150                65.0000
Purchase         621                   64.3467
Purchase         1,382                 65.0000
Purchase         3,976                 65.0000
Purchase         122                   65.0000
Purchase         10,880                65.0000
Purchase         1,636                 65.0000
Purchase         1,920                 65.0000
Sale             2                     64.2130
Sale             112                   64.9600
Sale             130                   63.7624
Sale             300                   63.8700
Sale             150                   64.9600
Sale             200                   64.9600
Sale             100                   64.9600
Sale             495                   63.8330
Sale             150                   64.9600
Sale             168                   64.8460
Sale             57                    65.0560
Sale             42,672                64.5239
Sale             49                    Transfer
Sale             151                   62.8815
Sale             200                   64.9600
Sale             990                   64.2391
Sale             38                    63.7245
Sale             13,618                64.7054
Sale             500                   63.5200
Sale             12,141                64.6831
Sale             387                   64.7600
Sale             900                   64.1061
Sale             26,187                64.9142
Sale             105                   64.9600
Sale             15,810                65.0000
Sale             150                   64.9600
Sale             100                   65.1920
Sale             65                    64.3925
Sale             150                   64.9600
Sale             200                   64.9600
Sale             114                   64.9600
Sale             150                   64.2624
Sale             70                    65.1800
Sale             100                   65.1800
Sale             90                    64.9600
Sale             75                    64.0720
Sale             381                   64.4767
Sale             364                   62.8100
Sale             1,654                 64.4488
Sale             281                   64.4685
Sale             37                    64.2300
Sale             35                    64.7374
Sale             200                   64.2020
Sale             85                    64.9600
Sale             50                    65.0060
Sale             230                   64.9600
Sale             150                   64.9600
Sale             50                    65.0060
Sale             125                   64.9600
Sale             75                    64.9600
Sale             60                    65.0530
Sale             2                     63.5900
Sale             100                   64.7375
Sale             50                    63.8700
Sale             100                   64.9600
Sale             110                   64.6300
Sale             186                   64.1545
Sale             150                   64.9600
Sale             152                   62.8100
Sale             100                   65.1800
Sale             200                   64.9600


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          500           63.52
CFD            Long          900           64.1061
CFD            Long          42672         64.5238
CFD            Long          354           64.6598
CFD            Long          13618         64.7054
CFD            Long          26187         64.9141
CFD            Short         961           63.9747
CFD            Short         47628         64.554
CFD            Short         1742          64.5548
CFD            Short         15551         64.5927
CFD            Short         6286          64.7232
CFD            Short         11775         64.8294
CFD            Short         1000          64.9597
CFD            Short         5605          65.0353
CFD            Short         5020          65.0371

(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                         09 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                   2,500.0000       EURO           20/06/2008
Option            Purchased   -250                   5,200.0000       EURO           19/09/2008
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