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 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      45,799,986      4.59%     2,208,868      0.22%
securities
(2) Derivatives    3,143,100      0.31%        25,379      0.00%
(other than
options)
(3) Options and      101,450      0.01%       101,080      0.01%
agreements to
purchase/sell
Total             49,044,536      4.91%     2,335,327      0.23%


(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         14,051                61.9350
Purchase         76                    Transfer
Purchase         90,800                61.2000
Purchase         215                   61.9100
Purchase         37                    Transfer
Purchase         6,400                 61.6105
Purchase         23,598                61.8366
Purchase         18,576                62.3700
Purchase         41                    Transfer
Purchase         2,993                 61.9066
Purchase         1,228                 61.7064
Purchase         257                   61.8226
Purchase         16,700                61.2000
Purchase         10,000                61.6609
Purchase         63                    61.8226
Purchase         139                   61.8400
Purchase         42,139                61.9286
Purchase         6,051                 62.3700
Purchase         41,056                61.8257
Sale             60                    61.6300
Sale             57                    61.9832
Sale             43                    61.9660
Sale             37                    Transfer
Sale             100                   62.0488
Sale             17                    61.7390
Sale             5,647                 61.8378
Sale             1,600                 61.9429
Sale             24                    61.8650
Sale             1,000                 62.0300
Sale             85                    61.8936
Sale             48                    61.6350
Sale             73                    61.8650
Sale             41                    Transfer
Sale             379                   61.6134
Sale             37                    61.8345
Sale             6,068                 62.3606
Sale             849                   61.8454
Sale             252                   61.8517
Sale             25                    77.6000 EUR
Sale             200                   62.3700
Sale             570                   61.8469
Sale             636                   62.0174
Sale             432                   61.8469
Sale             2,222                 61.8457
Sale             50                    61.8240
Sale             300                   61.9690
Sale             136                   62.0212
Sale             250                   61.6345
Sale             50                    62.0324
Sale             55                    61.8516
Sale             100                   61.8730
Sale             76                    Transfer
Sale             1,695                 61.8452
Sale             300                   61.9690
Sale             208                   61.8469
Sale             18,576                62.3700
Sale             1,188                 61.8469
Sale             2,921                 61.8469
Sale             100                   61.8130
Sale             726                   61.8484
Sale             75                    61.8731
Sale             215                   61.9500
Sale             200                   61.7932
Sale             400                   61.9160
Sale             130                   61.8130

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          379           61.6134
CFD            Long          5647          61.8378
CFD            Long          100           62.0488
CFD            Long          6068          62.3606
CFD            Short         6400          61.6104
CFD            Short         10000         61.6608
CFD            Short         41056         61.8257
CFD            Short         23598         61.8365
CFD            Short         2993          61.9066
CFD            Short         42139         61.9286
CFD            Short         14051         61.935

(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 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   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   -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