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               12 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      46,628,225       4.67%      635,411      0.06%
securities
(2) Derivatives      492,032       0.05%    1,926,614      0.19%
(other than
options)
(3) Options and      101,200       0.01%      151,400      0.01%
agreements to
purchase/sell
Total             47,221,457       4.73%    2,713,425      0.27%


(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         2,500                 43.6858
Purchase         150,000               45.0000
Purchase         8,751                 44.3587
Purchase         16,000                43.9530
Purchase         17,888                43.7709
Purchase         1                     43.3000
Purchase         20,989                44.2202
Purchase         956                   Transfer
Purchase         4,848                 44.3461
Purchase         80,000                43.8056
Purchase         60,000                42.0061
Purchase         1,250                 43.4776
Purchase         10,618                44.3169
Purchase         3,970                 41.5800
Purchase         7,707                 44.9000
Purchase         60,000                41.5215
Purchase         5,000                 43.6991
Purchase         16,500                41.5800
Purchase         1,500                 42.9887
Purchase         1,140                 42.9337
Purchase         1,325                 44.9000
Purchase         32                    Transfer
Purchase         45                    43.6700
Sale             59                    44.1430
Sale             100                   43.9831
Sale             314                   43.3900
Sale             24                    43.5700
Sale             200                   43.5700
Sale             12,459                43.8500
Sale             200                   43.4000
Sale             228                   43.4600
Sale             1,700                 43.7995
Sale             448                   44.8933
Sale             81,000                44.2235
Sale             66,500                44.1591
Sale             32                    Transfer
Sale             35,957                43.6485
Sale             25                    42.4910
Sale             1,942                 44.9000
Sale             569                   44.9000
Sale             8,671                 43.8500
Sale             120                   55.9100 EUR
Sale             16,641                44.6257
Sale             3,087                 44.8944
Sale             150,000               45.0000
Sale             8,073                 43.8053
Sale             26                    41.8740
Sale             10                    43.9960
Sale             16,500                41.5800
Sale             28                    43.4000
Sale             86,163                43.6681
Sale             256                   43.6100
Sale             23                    42.5132
Sale             48                    42.5636
Sale             33                    42.5340
Sale             28,922                43.785

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          35957         43.6485
CFD            Long          86163         43.668
CFD            Long          28922         43.7852
CFD            Long          1700          43.7995
CFD            Long          8073          43.8053
CFD            Long          6410          43.8268
CFD            Long          4878          43.8359
CFD            Long          33600         43.85
CFD            Long          100           43.9831
CFD            Long          66500         44.159
CFD            Long          16641         44.6256
CFD            Long          448           44.8932
CFD            Long          3087          44.8943
CFD            Short         60000         41.5215
CFD            Short         30400         41.65
CFD            Short         60000         42.0061
CFD            Short         2500          43.6858
CFD            Short         5000          43.699
CFD            Short         17888         43.7708
CFD            Short         80000         43.8056
CFD            Short         12470         43.85
CFD            Short         16000         43.9529
CFD            Short         20989         44.2201
CFD            Short         10618         44.3168
CFD            Short         4848          44.346
CFD            Short         8751          44.3586

NB: The below transactions which were previously disclosed have been cancelled
Deal Date  Long/Short Number of Securities Price per unit (GBP)
10/09/2008 Long       30,400               41.65

(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 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   -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   -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