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               16 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      46,840,084       4.69%      615,105      0.06%
securities
(2) Derivatives      449,599       0.05%    2,151,385      0.22%
(other than
options)
(3) Options and      101,200       0.01%      151,400      0.02%
agreements to
purchase/sell
Total             47,390,883       4.75%    2,917,890      0.29%


(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         35,833                39.3536
Purchase         267                   38.7200
Purchase         503,901               Transfer
Purchase         1,428                 38.7200
Purchase         13,330                39.1793
Purchase         843                   38.7200
Purchase         357                   38.8000
Purchase         2,121                 38.7200
Purchase         20,951                38.7200
Purchase         12,955                39.9367
Purchase         357                   38.8400
Purchase         121,426               39.2430
Purchase         434                   40.2849
Purchase         17,000                38.7394
Purchase         7,800                 38.9122
Purchase         14,909                39.5889
Purchase         644                   39.7800
Purchase         105                   40.9662
Purchase         270                   40.3919
Purchase         37,547                40.1673
Purchase         521                   Transfer
Purchase         43,000                40.0072
Purchase         762                   40.2849
Purchase         250                   38.7885
Purchase         391                   40.2849
Purchase         50                    50.6000 EUR
Purchase         1,761                 40.2849
Purchase         1,600                 39.5245
Purchase         3,244                 39.4685
Purchase         38,716                39.4458
Purchase         51,577                39.0721
Purchase         1,140                 40.2087
Purchase         311                   38.7200
Purchase         1,641                 39.5705
Purchase         4,216                 39.2282
Purchase         225                   39.5762
Purchase         125                   38.7200
Purchase         311                   38.7200
Purchase         1,395                 38.7200
Purchase         125                   38.7200
Purchase         4,912                 38.7200
Purchase         224                   39.5427
Purchase         281                   38.7200
Purchase         223                   39.5423
Purchase         624                   38.7200
Sale             3,896                 40.5260
Sale             4,154                 39.0543
Sale             5,656                 39.3293
Sale             32                    42.1400
Sale             30                    38.7270
Sale             524                   39.9100
Sale             503,901               Transfer
Sale             60                    38.7320
Sale             2,619                 39.9500
Sale             6,400                 39.3222
Sale             200                   40.0380
Sale             150                   40.0380
Sale             350                   40.0380
Sale             150                   40.3800
Sale             3,906                 41.9400
Sale             725                   38.7200
Sale             80                    40.6200
Sale             70                    40.3180
Sale             29,580                39.6413
Sale             1,792                 52.7000 EUR
Sale             13,330                39.1793
Sale             18,890                39.3896
Sale             22,142                39.5369
Sale             600                   40.3866
Sale             347                   72.1100 USD
Sale             644                   39.7800
Sale             4,000                 42.7546
Sale             357                   38.8400
Sale             54                    41.6000
Sale             4,860                 39.3321


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          4154          39.0543
CFD            Long          13330         39.1793
CFD            Long          6400          39.3221
CFD            Long          18890         39.3896
CFD            Long          1246          39.5349
CFD            Long          22142         39.5369
CFD            Long          19780         39.5418
CFD            Long          2027          39.5445
CFD            Long          29580         39.6412
CFD            Long          600           40.3866
CFD            Long          3896          40.526
CFD            Long          4000          42.7545
CFD            Short         7800          38.9122
CFD            Short         51577         39.072
CFD            Short         13330         39.1793
CFD            Short         121426        39.2429
CFD            Short         3244          39.4684
CFD            Short         14909         39.5888
CFD            Short         12955         39.9367
CFD            Short         37547         40.1672
CFD            Short         105           40.9661

(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                         17 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