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               29 July 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      46,524,649       4.66%      883,565      0.09%
securities
(2) Derivatives      659,847       0.07%    1,631,859      0.16%
(other than
options)
(3) Options and        1,200       0.00%        1,300      0.00%
agreements to
purchase/sell
Total             47,285,696       4.74%    2,616,724      0.26%


(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
Purchase         2,801                 52.6979
Purchase         62                    Transfer
Purchase         425                   51.3700
Purchase         53,294                52.5609
Purchase         10,512                51.9746
Purchase         2,295                 51.3764
Purchase         2,058                 51.3378
Purchase         3,076                 51.3378
Purchase         104,933               51.5800
Purchase         40                    51.8915
Purchase         1,933                 52.0486
Purchase         31,287                51.8796
Purchase         6,984                 51.3378
Purchase         7,000                 51.3700
Purchase         19,171                52.1040
Purchase         400                   52.2150
Purchase         9,579                 51.3700
Purchase         23                    Transfer
Sale             100                   50.6700
Sale             110                   52.6084
Sale             160                   50.6700
Sale             100                   50.6700
Sale             100                   50.6700
Sale             40                    50.6700
Sale             13,673                51.1680
Sale             12,984                51.9533
Sale             3,627                 51.6168
Sale             15,367                52.4022
Sale             13,544                51.4000
Sale             129                   Transfer
Sale             23                    Transfer
Sale             2,912                 51.9210
Sale             200                   52.0200
Sale             115                   51.9184
Sale             18,927                52.1369
Sale             30,530                51.3470
Sale             400                   52.2150
Sale             62                    Transfer
Sale             53,294                52.5609
Sale             96                    52.2200
Sale             211                   52.1323
Sale             626                   52.0717
Sale             526                   52.1631
Sale             300                   52.1900
Sale             100                   51.9463
Sale             5,436                 51.9516
Sale             125                   50.6700
Sale             2,917                 51.9350
Sale             250                   50.6700
Sale             165                   50.6700
Sale             1,859                 52.0668
Sale             1,735                 52.1323
Sale             230                   52.1323
Sale             233                   51.3700
Sale             200                   51.2521
Sale             125,655               52.2032
Sale             336                   52.1323
Sale             100                   50.6700
Sale             200                   52.3021
Sale             250                   50.6700
Sale             101,174               51.9637
Sale             150                   51.8905
Sale             5,417                 51.9510
Sale             100                   50.6700
Sale             110                   52.2500
Sale             2,015                 51.9202
Sale             2,953                 51.9344
Sale             2,526                 51.9104
Sale             4,204                 51.9492
Sale             209                   52.1323
Sale             30,264                51.9631

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          13673         51.1679
CFD            Long          30530         51.347
CFD            Long          13544         51.4
CFD            Long          3627          51.6167
CFD            Long          2912          51.9209
CFD            Long          12984         51.9532
CFD            Long          18927         52.1369
CFD            Long          125655        52.2032
CFD            Long          400           52.215
CFD            Long          15367         52.4021
CFD            Long          53294         52.5608
CFD            Short         11745         51.3598
CFD            Short         2295          51.3764
CFD            Short         31287         51.8796
CFD            Short         10512         51.9745
CFD            Short         1933          52.0485
CFD            Short         56921         52.0512
CFD            Short         19171         52.1039
CFD            Short         1050          52.166
CFD            Short         1944          52.1699
CFD            Short         2071          52.214
CFD            Short         400           52.215
CFD            Short         53294         52.5608
CFD            Short         2801          52.6979

(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                         30 July 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)


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   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   -250                   5,200.0000       EURO           19/09/2008
Option            Purchased   -270                   6,400.0000       EURO           19/12/2008
Option            Purchased   -500                   7,000.0000       EURO           19/12/2008
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