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               05 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      46,550,373       4.66%      711,602      0.07%
securities
(2) Derivatives     557,432        0.06%    1,988,837      0.20%
(other than
options)
(3) Options and      101,200       0.01%      101,400      0.01%
agreements to
purchase/sell
Total             47,209,005       4.73%    2,801,839      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           466                     44.7500
Purchase           177                     43.7075
Purchase           8,732                   43.6726
Purchase           47                      Transfer
Purchase           8,160                   44.8567
Purchase           7,786                   43.4917
Purchase           705                     43.1500
Purchase           11,000                  44.3911
Purchase           25,000                  43.1500
Purchase           33,883                  44.3838
Purchase           52,272                  43.2722
Purchase           1,700                   43.7113
Purchase           6,515                   43.9415
Purchase           400                     43.0065
Purchase           200                     43.3060
Purchase           25,239                  43.2375
Purchase           1,531                   43.1500
Purchase           7,649                   43.1500
Purchase           690                     44.7500
Purchase           42                      47.1700
Purchase           4,158                   47.1700
Purchase           354                     44.7500
Purchase           100                     42.9376
Purchase           1,000                   43.0700
Sale               62,119                  43.6181
Sale               18                      45.3975
Sale               17,131                  43.1348
Sale               33                      47.3045
Sale               2,527                   43.7370
Sale               489                     Transfer
Sale               2,500                   45.4852
Sale               2,500                   43.1305
Sale               11,183                  43.1592
Sale               442                     Transfer
Sale               16                      45.4260
Sale               46                      44.8800
Sale               125,977                 43.1500
Sale               34                      43.9675
Sale               170                     43.4730
Sale               804                     43.1500
Sale               4,158                   47.3000
Sale               681                     43.0612
Sale               280                     43.0600
Sale               295                     43.0000
Sale               26,700                  43.1500
Sale               11,133                  43.1500
Sale               527                     43.1500
Sale               55                      45.3945
Sale               80                      43.8230
Sale               62,025                  43.6657
Sale               7,838                   43.6123
Sale               130                     43.9245
Sale               34                      45.5132
Sale               133                     43.9500
Sale               35                      43.7830
Sale               42                      43.2290
Sale               13,726                  43.6219
Sale               7,900                   43.2654
Sale               24                      45.4340
Sale               100                     43.9224

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          2500          43.1305
CFD            Long          17131         43.1348
CFD            Long          11183         43.1592
CFD            Long          7900          43.2653
CFD            Long          7838          43.6123
CFD            Long          62119         43.6181
CFD            Long          13726         43.6218
CFD            Long          62025         43.6657
CFD            Long          2527          43.7369
CFD            Long          2500          45.4851
CFD            Short         400           43.0064
CFD            Short         146           43.1371
CFD            Short         14563         43.1414
CFD            Short         25239         43.2374
CFD            Short         52272         43.2722
CFD            Short         7786          43.4917
CFD            Short         8732          43.6726
CFD            Short         1700          43.7113
CFD            Short         4608          43.8476
CFD            Short         4292          43.8976
CFD            Short         1472          43.9117
CFD            Short         6515          43.9414
CFD            Short         33883         44.3837
CFD            Short         8160          44.8567

(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                         08 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   -100,000               64.0000          AMER           21/11/2008
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   -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

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