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               01 October 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      46,285,602       4.64%      805,833      0.08%
securities
(2) Derivatives    1,055,151       0.11%    1,453,795      0.15%
(other than
options)
(3) Options and      101,200       0.01%      152,000      0.02%
agreements to
purchase/sell
Total             47,441,953       4.75%    2,411,628      0.24%


(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         33,466                34.8700
Purchase         65,246                36.1789
Purchase         2,555                 36.8999
Purchase         830                   34.8477
Purchase         235                   36.8089
Purchase         71                    36.8089
Purchase         13,637                37.1479
Purchase         705                   34.8700
Purchase         3,288                 36.8999
Purchase         1,657                 36.5573
Purchase         91                    36.8089
Purchase         3,936                 36.5096
Purchase         23,539                36.0912
Purchase         83,801                34.5200
Purchase         20,950                34.7600
Purchase         84,606                34.8700
Purchase         4,500                 35.4527
Purchase         395                   34.8700
Purchase         383                   36.8900
Purchase         2,320                 34.4907
Purchase         852                   37.3601
Purchase         609                   34.8700
Purchase         134                   36.7000
Purchase         5,272                 37.3601
Purchase         127                   34.8600
Purchase         16,640                34.8700
Purchase         8,485                 36.8999
Purchase         28,000                34.5614
Purchase         15,013                34.8700
Purchase         1,217                 34.8700
Sale             28,000                34.5614
Sale             18                    33.5000
Sale             28,000                34.5614
Sale             717                   36.6400
Sale             16,140                35.0792
Sale             33,441                35.1712
Sale             35                    36.6260
Sale             188,096               35.8115
Sale             23,813                35.7813
Sale             270                   36.6400
Sale             400                   34.5623
Sale             5,133                 37.2407
Sale             1,957                 34.8648
Sale             53                    33.7640
Sale             165,908               35.2860
Sale             10,871                34.8700
Sale             5,390                 34.8700
Sale             200                   36.6150
Sale             6,523                 34.7100
Sale             3,936                 36.5096


NB: The below transactions which were previously disclosed have been cancelled
Deal Date    Purchase/Sale      Number of Securities    Price per unit (GBP)
30/09/2008   Purchase           5,000                   31.5341

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          28000         34.5614
CFD            Long          400           34.5623
CFD            Long          1957          34.8647
CFD            Long          16140         35.0791
CFD            Long          33441         35.1712
CFD            Long          165908        35.286
CFD            Long          23813         35.7813
CFD            Long          188096        35.8114
CFD            Long          2761          36.2914
CFD            Long          3936          36.5096
CFD            Long          4043          36.8651
CFD            Long          5133          37.2406
CFD            Short         2320          34.4906
CFD            Short         1669          34.87
CFD            Short         4500          35.4526
CFD            Short         23539         36.0912
CFD            Short         65246         36.1789
CFD            Short         3936          36.5096
CFD            Short         1657          36.5573
CFD            Short         13637         37.1478


NB: The below transactions which were previously disclosed have been cancelled
Deal Date     Long/Short     Number of Securities     Price per unit (GBP)
30/09/2008    Short          5,000                    31.5341

(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                         02 October 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   -50,000                64.0000          AMER           21/11/2008
Option            Purchased   -100,000               64.0000          AMER           21/11/2008
Option            Purchased   100,000                56.0000          AMER           18/12/2009
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   -300                   4,400.0000       EURO           19/12/2008
Option            Purchased   -300                   4,400.0000       EURO           19/12/2008
Option            Purchased   -350                   5,000.0000       EURO           19/12/2008
Option            Purchased   -500                   7,000.0000       EURO           19/12/2008
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

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