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               18 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      46,872,642       4.68%      612,001      0.06%
securities
(2) Derivatives      524,363       0.05%    2,068,948      0.21%
(other than
options)
(3) Options and      101,200       0.01%      151,400      0.02%
agreements to
purchase/sell
Total             47,498,205       4.74%    2,832,349      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         2,000                 37.7704
Purchase         52,990                37.1545
Purchase         11,500                36.4914
Purchase         3,106                 36.5500
Purchase         13,625                37.4331
Purchase         70,271                36.7841
Purchase         10,000                37.6492
Purchase         87                    Transfer
Purchase         98,880                36.5000
Purchase         48,632                37.1785
Purchase         16,735                36.5500
Purchase         2,139                 37.9389
Purchase         850                   36.5500
Purchase         115                   37.6157
Purchase         13,000                36.5500
Purchase         8,300                 37.1101
Purchase         33,433                37.0630
Purchase         54                    Transfer
Purchase         3,068                 37.2304
Sale             61,200                37.5826
Sale             103                   37.3550
Sale             46                    40.7130
Sale             843                   Transfer
Sale             67,639                37.6772
Sale             437                   Transfer
Sale             255                   38.2600
Sale             642                   65.4000 USD
Sale             54                    Transfer
Sale             13,000                36.0000
Sale             34                    41.3230
Sale             120                   65.4000 USD
Sale             1,650                 37.4540
Sale             87                    Transfer
Sale             1,280                 37.3197
Sale             140                   37.7800
Sale             349                   38.2600
Sale             47                    Transfer
Sale             1,016                 37.6331
Sale             2,252                 37.6331
Sale             200                   38.0130
Sale             377                   36.5500
Sale             1,672                 36.5500
Sale             600                   37.1500
Sale             953                   Transfer
Sale             160                   37.7800
Sale             147                   Transfer
Sale             17,103                36.5500
Sale             90                    37.7800
Sale             50                    38.3576
Sale             28,174                37.3935
Sale             13,600                37.4672
Sale             11,963                37.7902
Sale             8,073                 39.4454
Sale             16,642                37.2571
Sale             3,068                 37.2304
Sale             150                   37.7800


NB: The below transactions which were previously disclosed have been cancelled
Deal Date  Purchase/Sale Number of Securities Price per unit (GBP)
17/09/2008 Sale          243                  40.3300

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          16642         37.257
CFD            Long          1280          37.3197
CFD            Long          19031         37.3855
CFD            Long          13600         37.4671
CFD            Long          61200         37.5825
CFD            Long          67639         37.6772
CFD            Long          11963         37.7901
CFD            Short         11500         36.4914
CFD            Short         4205          36.55
CFD            Short         70271         36.784
CFD            Short         33433         37.0629
CFD            Short         8300          37.1101
CFD            Short         52990         37.1544
CFD            Short         48632         37.1784
CFD            Short         115           37.6156
CFD            Short         10000         37.6492
CFD            Short         2000          37.7704

(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                         19 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