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               09 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      46,264,809       4.64%      747,776      0.07%
securities
(2) Derivatives      593,141       0.06%    1,987,037      0.20%
(other than
options)
(3) Options and      101,200       0.01%      101,400      0.01%
agreements to
purchase/sell
Total             46,959,150       4.70%    2,836,213      0.28%


(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         7,200                 42.3969
Purchase         17,796                44.3845
Purchase         7,178                 42.7840
Purchase         16,011                42.1802
Purchase         500                   44.4555
Purchase         42                    44.0567
Purchase         1,100                 44.2752
Purchase         37,522                43.0563
Purchase         600                   42.7314
Purchase         20,000                42.6500
Purchase         2,248                 42.9801
Purchase         6,606                 42.6500
Purchase         900                   42.5168
Purchase         1,200                 44.2752
Purchase         150                   43.2060
Purchase         3,906                 44.9000
Purchase         6,606                 44.9000
Purchase         3,303                 44.9000
Purchase         4,803                 42.6500
Purchase         2,228                 42.6500
Purchase         176                   42.6500
Purchase         251                   44.7236
Purchase         55,014                42.6500
Sale             1,000                 78.7600 USD
Sale             1,634                 42.7585
Sale             12,700                44.2524
Sale             1,600                 44.3000
Sale             600                   42.7314
Sale             64                    44.5500
Sale             5,464                 44.9000
Sale             7,700                 44.0526
Sale             77,113                43.8011
Sale             150                   42.7036
Sale             23,869                42.4507
Sale             2,500                 43.8679
Sale             51                    45.1400
Sale             50,668                42.9604
Sale             502                   44.3834
Sale             753                   44.3834
Sale             900                   44.3160
Sale             50                    44.5590
Sale             50                    43.9332
Sale             62                    44.1620
Sale             243                   44.3834
Sale             29                    45.1800
Sale             200                   44.2624
Sale             7,420                 44.9000
Sale             1,105                 44.9000
Sale             3,906                 44.9000
Sale             160,493               43.3581

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          653           41.8334
CFD            Long          23869         42.4507
CFD            Long          150           42.7036
CFD            Long          600           42.7313
CFD            Long          1634          42.7585
CFD            Long          50668         42.9603
CFD            Long          160493        43.358
CFD            Long          77113         43.801
CFD            Long          7700          44.0526
CFD            Long          360           44.137
CFD            Long          3812          44.1932
CFD            Long          12700         44.2524
CFD            Long          900           44.316
CFD            Short         16011         42.1801
CFD            Short         7200          42.3969
CFD            Short         900           42.5168
CFD            Short         600           42.7313
CFD            Short         7178          42.784
CFD            Short         2248          42.98
CFD            Short         37522         43.0563
CFD            Short         465           43.8
CFD            Short         42            44.0566
CFD            Short         510           44.3105
CFD            Short         17796         44.3845
CFD            Short         3140          44.8911
CFD            Short         349           45.241

(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                         10 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   -135                   5,200.0000       EURO           19/12/2008
Option            Purchased   -145                   5,200.0000       EURO           19/12/2008
Option            Purchased   -150                   7,000.0000       EURO           19/12/2008
Option            Purchased   -270                   6,400.0000       EURO           19/12/2008
Option            Purchased   -350                   7,000.0000       EURO           19/12/2008
Option            Purchased   -350                   5,000.0000       EURO           19/12/2008
Option            Purchased   350                    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   150                    5,000.0000       EURO           19/12/2008
Option            Purchased   -100,000               64.0000          AMER           21/11/2008
Option            Purchased   100,000                56.0000          AMER           18/12/2009



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