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               19 September 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      46,876,481       4.68%      435,374      0.04%
securities
(2) Derivatives      535,727       0.05%    1,886,309      0.19%
(other than
options)
(3) Options and      101,200       0.01%      151,400      0.02%
agreements to
purchase/sell
Total             47,513,408       4.74%    2,473,083      0.25%


(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         400                   39.9680
Purchase         10,770                41.6800
Purchase         275                   39.8118
Purchase         539                   41.6800
Purchase         480                   40.5800
Purchase         272                   41.6800
Purchase         6,403                 41.6800
Purchase         727                   41.6800
Purchase         2,932                 41.6800
Purchase         1,475                 41.6800
Purchase         10,769                41.7235
Purchase         29,000                40.9063
Purchase         229                   41.6800
Purchase         6,860                 41.6800
Purchase         352                   41.6800
Purchase         104,984               40.1800
Purchase         536,835               40.9288
Purchase         706                   Transfer
Purchase         86,170                39.9964
Purchase         662                   41.6800
Purchase         2,544                 39.1100
Purchase         36                    Transfer
Purchase         70,951                41.1854
Purchase         27,000                41.9711
Purchase         33                    41.6000
Purchase         38,827                41.4073
Purchase         73,515                41.2000
Purchase         995                   41.6800
Purchase         223                   41.6800
Purchase         7,188                 41.6800
Purchase         7,561                 41.6800
Purchase         850                   41.6800
Purchase         12,729                41.6800
Purchase         2,869                 41.6800
Purchase         216                   41.6800
Purchase         6,658                 36.5000
Purchase         44,121                41.6800
Purchase         268                   36.5000
Purchase         150                   39.6450
Purchase         453                   41.6800
Purchase         144                   41.6800
Purchase         609                   41.6800
Purchase         145                   41.6800
Sale             247                   Transfer
Sale             1,200                 40.1040
Sale             133                   41.6800
Sale             165                   41.1200
Sale             2,515                 41.6800
Sale             120,562               41.3831
Sale             217                   41.6800
Sale             100                   40.0000
Sale             2,466                 41.6800
Sale             73,810                41.1636
Sale             536,835               40.9288
Sale             3,100                 40.3221
Sale             109,724               41.0411
Sale             1,672                 41.6800
Sale             351                   41.5700
Sale             19                    36.9710
Sale             130                   39.5800
Sale             35,442                40.9666
Sale             1,475                 41.6800
Sale             215                   40.9500
Sale             662                   41.6800
Sale             30                    52.0000 EUR
Sale             30                    49.7800 EUR
Sale             109                   Transfer
Sale             154                   Transfer
Sale             6,860                 41.6800
Sale             152,379               40.9105
Sale             5,921                 41.6800
Sale             559                   41.6800
Sale             6,658                 36.5000
Sale             268                   36.5000
Sale             32,300                40.4040
Sale             762                   41.3300
Sale             110                   40.5200
Sale             2,207                 41.6800
Sale             8,138                 41.0617
Sale             36                    Transfer
Sale             215                   39.6100
Sale             200                   40.4300
Sale             110                   Transfer

NB: The below transactions which were previously disclosed have been cancelled
Deal Date     Purchase/Sale     Number of Securities    Price per unit (GBP)
18/09/2008    Sale              13,000                  36.0000

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          1200          40.1039
CFD            Long          32300         40.404
CFD            Long          152379        40.9104
CFD            Long          536835        40.9288
CFD            Long          35442         40.9666
CFD            Long          109724        41.0411
CFD            Long          8138          41.0616
CFD            Long          73810         41.1635
CFD            Short         6297          39.7252
CFD            Short         400           39.968
CFD            Short         29000         40.9063
CFD            Short         536835        40.9288
CFD            Short         70951         41.1853
CFD            Short         73515         41.1999
CFD            Short         38827         41.4072

(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 September 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   -50,000                64.0000          AMER           21/11/2008
Option            Purchased   -100,000               64.0000          AMER           21/11/2008
Option            Purchased   500                    5,000.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   -135                   5,200.0000       EURO           19/12/2008
Option            Purchased   -145                   5,200.0000       EURO           19/12/2008
Option            Purchased   -270                   6,400.0000       EURO           19/12/2008
Option            Purchased   -350                   5,000.0000       EURO           19/12/2008
Option            Purchased   -500                   7,000.0000       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