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               14 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      47,103,962      4.72%     1,013,410      0.10%
securities
(2) Derivatives    2,814,627      0.28%        44,866      0.00%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             50,020,039      5.01%     1,199,356      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         80,000                69.0942
Purchase         1,409                 68.4407
Purchase         174                   67.8567
Purchase         72                    67.9519
Purchase         504                   67.8567
Purchase         14,952                68.3509
Purchase         4,100                 69.2841
Purchase         8,534                 69.2651
Purchase         7,872                 68.9319
Purchase         910                   67.8567
Purchase         6,625                 68.3509
Purchase         399                   67.8567
Purchase         144                   Transfer
Purchase         3,000                 68.8100
Purchase         10,005                66.5051
Purchase         4,479                 68.3509
Purchase         200                   67.5522
Purchase         25,673                68.8521
Purchase         1,875                 68.5348
Purchase         38,768                68.8100
Purchase         11,770                68.8750
Purchase         12,825                68.8100
Purchase         170                   67.9519
Purchase         1,822                 67.8567
Purchase         564                   67.9519
Purchase         703                   67.8567
Purchase         4,278                 67.8567
Purchase         396                   67.8567
Purchase         3,161                 67.8567
Purchase         175                   67.9519
Purchase         1,058                 67.8567
Purchase         422                   67.8567
Purchase         1,144                 67.8567
Purchase         354                   67.9519
Purchase         190                   67.9519
Sale             69                    64.3390
Sale             8,779                 67.8251
Sale             1,204                 68.4460
Sale             48                    67.4148
Sale             26                    Transfer
Sale             19                    65.9230
Sale             167                   67.7500
Sale             8,285                 67.2637
Sale             64                    64.7045
Sale             1,497                 67.4701
Sale             144                   Transfer
Sale             83                    68.8100
Sale             1,419                 68.8100
Sale             5,655                 68.8100
Sale             77                    67.4600
Sale             205                   68.3008
Sale             256                   68.8100
Sale             61                    67.2248
Sale             222                   68.8100
Sale             22,309                67.9256
Sale             38                    69.3100
Sale             20,427                68.6774
Sale             135                   68.8100
Sale             2,294                 68.8100
Sale             44                    68.8416
Sale             21                    67.6616
Sale             300                   69.2600
Sale             40                    67.9600
Sale             87                    68.8100
Sale             70                    68.9031
Sale             250                   68.9100
Sale             85                    67.6816
Sale             50                    68.3000
Sale             41,966                67.8351
Sale             120                   68.9400
Sale             50                    67.4900
Sale             2,300                 68.0000
Sale             80                    68.1124
Sale             80                    67.9020
Sale             125                   67.7132
Sale             50                    67.2200
Sale             95                    69.2200
Sale             250                   67.5100
Sale             160                   67.6932
Sale             200                   68.9700
Sale             41,170                68.0206
Sale             11,028                68.8100
Sale             28                    68.6230
Sale             100                   67.4900
Sale             250                   67.4900
Sale             80                    67.6824
Sale             50                    67.4356
Sale             65                    67.5635
Sale             80                    67.7916
Sale             100                   68.3000
Sale             100                   67.3632
Sale             50                    67.4532
Sale             85                    67.3732
Sale             75                    67.3900
Sale             27,274                67.7090
Sale             65                    69.1400


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          8285          67.2636
CFD            Long          468           67.4465
CFD            Long          1497          67.4701
CFD            Long          27274         67.709
CFD            Long          8779          67.825
CFD            Long          41966         67.835
CFD            Long          22309         67.9256
CFD            Long          41170         68.0205
CFD            Long          205           68.3008
CFD            Long          20427         68.6773
CFD            Short         10005         66.5051
CFD            Short         200           67.5522
CFD            Short         1875          68.5348
CFD            Short         25673         68.8521
CFD            Short         11770         68.875
CFD            Short         7872          68.9318
CFD            Short         80000         69.0941
CFD            Short         8534          69.265
CFD            Short         4100          69.2841


(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                         15 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   -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
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


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