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               27 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      46,954,456      4.70%       876,555      0.09%
securities
(2) Derivatives    2,681,373      0.27%       154,664      0.02%
(other than
options)
(3) Options and      101,450      0.01%       341,080      0.03%
agreements to
purchase/sell
Total             49,737,279      4.98%      1,372,299     0.14%


(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         1,142                 61.7800
Purchase         8,897                 62.5126
Purchase         47,410                61.8730
Purchase         35,343                63.0063
Purchase         510                   61.7800
Purchase         661                   61.7800
Purchase         5,315                 61.7893
Purchase         167                   61.7800
Purchase         1,160                 63.0993
Purchase         190                   62.3300
Purchase         22,000                63.0000
Purchase         1,000                 62.2719
Purchase         20,119                62.2491
Purchase         2,001                 63.7931
Purchase         24                    Transfer
Purchase         197                   61.7800
Purchase         5,900                 62.2310
Purchase         586                   61.7800
Purchase         23,649                62.3795
Purchase         797                   63.6400
Purchase         367                   62.6007
Purchase         896                   64.0939
Purchase         419                   61.7800
Purchase         419                   61.7800
Purchase         427                   62.1600
Purchase         1,081                 62.1600
Purchase         415                   61.7800
Sale             5,549                 62.2340
Sale             372                   Transfer
Sale             682                   62.1000
Sale             24,317                62.2399
Sale             6,012                 62.6048
Sale             4,452                 62.3324
Sale             5,713                 62.6476
Sale             8,500                 61.7800
Sale             2,999                 62.2104
Sale             3,584                 62.2742
Sale             200                   64.0804
Sale             764                   64.2043
Sale             41                    62.2860
Sale             91                    62.1800
Sale             11,723                61.7800
Sale             4,101                 61.7800
Sale             25,848                61.8446
Sale             1,256                 61.7800
Sale             75                    62.0200
Sale             125                   63.3500
Sale             20                    63.0640
Sale             50                    62.6650
Sale             270                   63.3500
Sale             12                    62.6650
Sale             6                     62.6650
Sale             25                    62.7324
Sale             120                   62.3848
Sale             6,000                 Transfer
Sale             2,981                 63.6400
Sale             4,312                 61.7800
Sale             100                   62.6650
Sale             75                    62.2036
Sale             3,119                 64.2043
Sale             24                    Transfer
Sale             175                   62.7040
Sale             50                    62.3848
Sale             70                    62.9900
Sale             214                   62.0300
Sale             833                   62.4658
Sale             90                    62.1224

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          943           61.7924
CFD            Long          2999          62.2104
CFD            Long          5549          62.234
CFD            Long          24317         62.2398
CFD            Long          3584          62.2741
CFD            Long          4452          62.3323
CFD            Long          833           62.4658
CFD            Long          6012          62.6047
CFD            Long          5713          62.6475
CFD            Long          200           64.0804
CFD            Short         5315          61.7892
CFD            Short         47410         61.8729
CFD            Short         5900          62.231
CFD            Short         20119         62.249
CFD            Short         1000          62.2719
CFD            Short         23649         62.3794
CFD            Short         8897          62.5125
CFD            Short         35343         63.0063
CFD            Short         2001          63.793


(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)
CALL            Purchase          200,000            74        AMER           20/06/2008   4.5

(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                         28 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   -135                   5,200.0000       EURO           19/12/2008
Option            Purchased   -100,000               30.0000          AMER           20/06/2008
Option            Purchased   -38,000                70.0000          AMER           20/06/2008
Option            Purchased   -10,000                74.0000          AMER           20/06/2008
Option            Purchased   -2,000                 70.0000          AMER           20/06/2008
Option            Purchased   -300                   3,800.0000       EURO           20/06/2008
Option            Purchased   -250                   2,500.0000       EURO           20/06/2008
Option            Purchased   -190,000               74.0000          AMER           20/06/2008
Option            Purchased   -145                   5,200.0000       EURO           19/12/2008
Option            Purchased   100,000                56.0000          AMER           18/12/2009
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   250                    3,800.0000       EURO           20/06/2008
Option            Purchased   250                    3,000.0000       EURO           20/06/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   -250                   5,200.0000       EURO           19/09/2008


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