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               27 August 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      46,341,778       4.63%      796,474      0.08%
securities
(2) Derivatives      532,861       0.05%    1,800,395      0.18%
(other than
options)
(3) Options and      101,200       0.01%      101,450      0.01%
agreements to
purchase/sell
Total             46,975,839       4.69%    2,698,319      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         200                   51.0500
Purchase         46,125                51.7661
Purchase         9,000                 52.4300
Purchase         756                   52.2251
Purchase         9,355                 51.9868
Purchase         756                   52.2264
Purchase         11,172                51.9436
Purchase         3,900                 51.1787
Purchase         51,262                51.9439
Purchase         400                   51.5275
Purchase         62                    51.7882
Purchase         22,664                51.5000
Purchase         425                   52.4300
Purchase         3,856                 52.4300
Purchase         1,948                 51.4585
Purchase         580                   52.4300
Purchase         22,000                51.7000
Sale             31                    51.5730
Sale             3,856                 51.8726
Sale             2,450                 51.8186
Sale             29                    51.1860
Sale             6,679                 51.1499
Sale             10,235                51.5859
Sale             100                   51.3460
Sale             55                    50.1075
Sale             16,940                52.4149
Sale             6,324                 50.2206
Sale             756                   52.2264
Sale             230                   51.5230
Sale             3,110                 52.4300
Sale             246                   52.4300
Sale             14                    51.5145
Sale             400                   51.5275
Sale             28,400                52.3641
Sale             1,000                 51.7225
Sale             60                    51.6723

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          6324          50.2205
CFD            Long          6679          51.1499
CFD            Long          400           51.5275
CFD            Long          1000          51.7225
CFD            Long          2450          51.8185
CFD            Long          28400         52.3641
CFD            Long          16940         52.4149
CFD            Long          219           52.4405
CFD            Short         3900          51.1787
CFD            Short         1948          51.4585
CFD            Short         400           51.5275
CFD            Short         46125         51.766
CFD            Short         62            51.7882
CFD            Short         11172         51.9436
CFD            Short         51262         51.9438
CFD            Short         9355          51.9868
CFD            Short         756           52.2263

(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                         28 August 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   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   300                    5,000.0000       EURO           19/12/2008
Option            Purchased   200                    5,000.0000       EURO           19/09/2008
Option            Purchased   200                    5,000.0000       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   -200                   7,000.0000       EURO           19/12/2008
Option            Purchased   -250                   5,200.0000       EURO           19/09/2008
Option            Purchased   -270                   6,400.0000       EURO           19/12/2008
Option            Purchased   -300                   7,000.0000       EURO           19/12/2008
Option            Purchased   -350                   5,000.0000       EURO           19/12/2008
Option            Purchased   100,000                56.0000          AMER           18/12/2009
Option            Purchased   -100,000               64.0000          AMER           21/11/2008



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