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               12 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      46,224,767      4.63%     1,075,782      0.11%
securities
(2) Derivatives      720,413      0.07%     2,086,295      0.21%
(other than
options)
(3) Options and      101,400      0.01%       101,300      0.01%
agreements to
purchase/sell
Total             47,046,580      4.71%     3,263,377      0.33%


(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         17,759                45.4367
Purchase         37                    44.8758
Purchase         7,336                 45.4143
Purchase         6,644                 45.3500
Purchase         7,500                 45.3500
Purchase         91,776                45.3109
Purchase         12,000                45.1370
Purchase         14,130                45.3609
Purchase         3,109                 45.3333
Purchase         668                   Transfer
Purchase         11,337                20.0048
Purchase         110,287               45.1820
Purchase         5,903                 45.2223
Purchase         2,395                 45.3775
Purchase         1,604                 45.3775
Purchase         1,105                 44.9588
Purchase         15,260                45.2305
Purchase         200                   45.1960
Purchase         1,300                 45.0449
Purchase         32,000                45.9000
Purchase         425                   45.3500
Purchase         5,439                 45.3775
Purchase         19,342                45.6037
Purchase         1,400                 45.0449
Purchase         13,660                45.4521
Purchase         500                   45.1780
Purchase         110                   44.9258
Purchase         11,834                45.3500
Purchase         2,225                 45.0276
Sale             26                    45.1863
Sale             23                    44.9463
Sale             2,030                 45.1623
Sale             26,156                45.4080
Sale             3,105                 45.4297
Sale             19,342                45.6037
Sale             4,192                 45.3978
Sale             9,000                 48.0264
Sale             4,900                 45.2861
Sale             982                   45.3072
Sale             200                   44.9484
Sale             553                   45.2681
Sale             1,743                 44.8762
Sale             1,190                 45.2680
Sale             3,712                 45.2683
Sale             420                   45.2721
Sale             473                   45.2700
Sale             668                   45.2671
Sale             218                   45.3600
Sale             10,132                45.0487
Sale             200                   45.2021
Sale             23                    45.0800
Sale             50                    44.8464
Sale             2,200                 45.3632
Sale             75                    44.8121
Sale             105                   45.0700
Sale             65                    45.5805
Sale             115                   45.1820
Sale             218                   45.2746
Sale             245                   45.2749
Sale             4,617                 45.3500
Sale             200                   44.8463
Sale             200                   44.9184
Sale             800                   45.5432
Sale             503,901               Transfer
Sale             45                    44.8462

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          2030          45.1623
CFD            Long          4900          45.2861
CFD            Long          982           45.3071
CFD            Long          2200          45.3631
CFD            Long          26156         45.4079
CFD            Long          3105          45.4296
CFD            Long          800           45.5432
CFD            Long          19342         45.6036
CFD            Long          9000          48.0264
CFD            Short         83800         44.9886
CFD            Short         2225          45.0276
CFD            Short         42888         45.0352
CFD            Short         422           45.1281
CFD            Short         12000         45.1369
CFD            Short         110287        45.1819
CFD            Short         5903          45.2223
CFD            Short         15260         45.2305
CFD            Short         91776         45.3108
CFD            Short         3109          45.3333
CFD            Short         14130         45.3609
CFD            Short         17759         45.4367
CFD            Short         13660         45.452
CFD            Short         19342         45.6036
CFD            Short         32000         45.9

(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                         13 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   100,000                 56.0000         AMER           18/12/2009
Option            Purchased   -100,000                64.0000         AMER           21/11/2008
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



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