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               20 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      46,920,760      4.70%       865,196      0.09%
securities
(2) Derivatives    2,660,141      0.27%        56,406      0.01%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,682,351      4.98%     1,062,682      0.11%


(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         504                   65.9300
Purchase         2,880                 66.5487
Purchase         60,000                66.6751
Purchase         192                   65.9300
Purchase         85,655                67.4533
Purchase         1,624                 66.5433
Purchase         3,270                 65.9300
Purchase         18,810                66.5533
Purchase         139                   69.0534
Purchase         9,045                 67.4062
Purchase         60,000                66.6751
Purchase         153                   66.3900
Purchase         1,240                 67.0782
Purchase         36                    67.0700
Purchase         70                    69.5800
Purchase         9,989                 66.9639
Purchase         50                    87.0700 EUR
Purchase         60                    85.0000 EUR
Purchase         17,335                66.5649
Purchase         5,395                 65.9300
Purchase         19,741                65.9300
Purchase         5,104                 65.9399
Purchase         400                   70.5000
Sale             14,005                66.8369
Sale             27,273                68.8979
Sale             8,872                 68.6944
Sale             1,500                 Transfer
Sale             32                    66.5000
Sale             334                   Transfer
Sale             967                   67.3451
Sale             8,746                 66.9824
Sale             32,700                68.4203
Sale             139                   69.0534
Sale             60                    68.5260
Sale             60,000                66.6751
Sale             100                   66.5944
Sale             1,495                 65.9300
Sale             200                   65.9300
Sale             3,900                 65.9300
Sale             113                   65.9300
Sale             142                   70.5000
Sale             1,511                 65.9300
Sale             120                   67.0516
Sale             60                    67.0912
Sale             50                    67.6112
Sale             100                   66.2200
Sale             75                    67.0924
Sale             200                   66.4900
Sale             100                   67.3312
Sale             4,374                 69.1442
Sale             100                   69.1940
Sale             350                   69.0500
Sale             70                    68.1800
Sale             170                   66.3532
Sale             220                   67.6100
Sale             100                   67.2508
Sale             85                    68.2832
Sale             50                    66.7400
Sale             30                    67.3923
Sale             3,200                 66.4256
Sale             12,449                68.5165
Sale             50                    68.0924



(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          3200          66.4256
CFD            Long          14005         66.8368
CFD            Long          12449         68.5164
CFD            Long          8872          68.6944
CFD            Long          27273         68.8978
CFD            Long          4374          69.1441
CFD            Short         5104          65.9398
CFD            Short         1624          66.5433
CFD            Short         2880          66.5487
CFD            Short         18810         66.5532
CFD            Short         17335         66.5649
CFD            Short         60000         66.6751
CFD            Short         9989          66.9638
CFD            Short         1240          67.0782
CFD            Short         9045          67.4061
CFD            Short         85655         67.4532
CFD            Short         464           69.3745



(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                         21 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