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               21 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      46,641,956      4.67%       943,930      0.09%
securities
(2) Derivatives    2,733,555      0.27%        69,952      0.01%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,476,961      4.96%     1,154,962      0.12%


(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         4,122                 67.0008
Purchase         271                   68.3376
Purchase         549                   68.3376
Purchase         22,389                66.6319
Purchase         988                   66.6800
Purchase         186,895               67.0050
Purchase         80,000                66.9941
Purchase         2,065                 66.6762
Purchase         377                   66.4100
Purchase         146                   Transfer
Purchase         13,551                66.6112
Purchase         11,000                65.9871
Purchase         128,000               66.4000
Purchase         80,000                66.9941
Purchase         1,400                 67.0300
Purchase         749                   66.3400
Purchase         52                    66.3400
Purchase         193                   66.3400
Purchase         413                   66.3400
Purchase         119                   66.4100
Purchase         20                    83.8600 EUR
Purchase         6,714                 66.4780
Purchase         7,819                 66.5225
Purchase         192                   65.9300
Sale             80                    66.4400
Sale             35                    66.4400
Sale             549                   68.3376
Sale             70                    66.4400
Sale             186,895               67.0050
Sale             20                    66.4400
Sale             85                    66.4400
Sale             50                    66.4400
Sale             110                   66.4400
Sale             40                    66.9900
Sale             150                   66.1232
Sale             30                    66.4400
Sale             50                    67.0324
Sale             56,167                66.3365
Sale             75                    67.0324
Sale             330                   67.0700
Sale             75                    67.0100
Sale             25                    66.4400
Sale             1,491                 67.0800
Sale             157                   66.9900
Sale             45                    Transfer
Sale             959                   66.3900
Sale             22                    66.9700
Sale             5,104                 66.5344
Sale             80,000                66.9941
Sale             271                   68.3376
Sale             128                   66.2020
Sale             24                    66.2300
Sale             4,500                 66.4100
Sale             66                    66.2016
Sale             110                   66.4400
Sale             150                   66.4400
Sale             1,806                 66.3459
Sale             18,537                66.3825
Sale             814                   66.6787
Sale             146                   Transfer
Sale             128,000               66.4000
Sale             128,000               66.4000
Sale             325                   66.0500
Sale             118                   66.9100
Sale             50                    66.2124
Sale             75                    66.3900
Sale             200                   67.0520
Sale             100                   65.7940
Sale             100                   65.7940
Sale             175                   66.9032
Sale             285                   66.8900
Sale             100                   67.0900
Sale             210                   66.4400
Sale             85                    66.4400
Sale             90                    66.4400
Sale             7,728                 66.4100
Sale             100                   66.8736
Sale             160                   66.4400
Sale             50                    66.4400
Sale             65                    66.4400
Sale             45                    66.4400
Sale             85                    66.4400
Sale             70                    66.4400
Sale             80                    66.4400
Sale             400                   66.0500
Sale             150                   67.0200
Sale             186,895               67.0050
Sale             100                   67.1700
Sale             120                   66.4400
Sale             80                    66.4400
Sale             70                    66.4400
Sale             65                    66.4400
Sale             11,806                70.7800
Sale             100                   66.4400
Sale             50                    66.4400
Sale             35                    66.4400
Sale             100                   66.4400
Sale             80                    66.4400
Sale             100                   66.4400
Sale             75                    67.0100
Sale             100                   66.4400
Sale             140                   66.9424
Sale             45                    66.4400
Sale             30                    66.4400
Sale             95                    66.4400
Sale             60                    66.4400
Sale             100                   66.4400
Sale             90                    66.9820
Sale             90                    66.9820
Sale             90                    66.6620
Sale             100                   66.4400
Sale             115                   66.4400
Sale             80                    66.4400
Sale             45                    66.4400
Sale             50                    66.4400

NB: The below transactions which were previously disclosed have been cancelled
Deal Date       Purchase/Sale      Number of Securities     Price per unit (GBP)
21/05/2008      Sale               90                       66.9820

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          56167         66.3365
CFD            Long          1806          66.3459
CFD            Long          18537         66.3824
CFD            Long          128000        66.4
CFD            Long          5104          66.5344
CFD            Long          814           66.6787
CFD            Long          22            66.97
CFD            Short         11000         65.987
CFD            Short         534           66.3968
CFD            Short         6714          66.4779
CFD            Short         7819          66.5225
CFD            Short         13551         66.6112
CFD            Short         22389         66.6318
CFD            Short         2065          66.6761
CFD            Short         988           66.68
CFD            Short         80000         66.9941
CFD            Short         4122          67.0007
CFD            Short         1400          67.03


(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                         22 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