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               07 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      46,159,339      4.62%     1,014,957      0.10%
securities
(2) Derivatives      701,239      0.07%     1,709,155      0.17%
(other than
options)
(3) Options and      101,400      0.01%       101,300      0.00%
agreements to
purchase/sell
Total             46,961,978      4.71%     2,825,412      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         13,018                48.4510
Purchase         70,600                48.9450
Purchase         16,000                48.9643
Purchase         800                   49.2150
Purchase         4,025                 48.2240
Purchase         112                   62.4900 EUR
Purchase         622                   48.3049
Purchase         3,475                 48.4303
Purchase         2,079                 49.6494
Purchase         112                   62.4100 EUR
Purchase         62,012                48.8850
Purchase         104                   48.1100
Purchase         2,482                 49.1800
Purchase         1,275                 48.1100
Purchase         714                   48.1100
Purchase         3,303                 48.1100
Purchase         9,705                 48.1100
Purchase         112                   62.4100 EUR
Purchase         28,947                48.1486
Purchase         5,011                 47.9477
Purchase         1,000                 49.4000
Purchase         334                   49.4992
Sale             16,711                49.3311
Sale             32,800                48.7106
Sale             70,700                48.7807
Sale             1,200                 49.3400
Sale             103                   49.5100
Sale             79                    Transfer
Sale             14,942                48.8815
Sale             1,282                 49.2327
Sale             16,000                48.9643
Sale             16,000                48.9643
Sale             26,651                48.0111
Sale             28,838                48.1424
Sale             22                    Transfer
Sale             800                   49.2150
Sale             248                   49.5216
Sale             170                   49.3005
Sale             561                   48.2000
Sale             752                   49.4788
Sale             27                    Transfer

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          26651         48.0111
CFD            Long          28838         48.1424
CFD            Long          32800         48.7106
CFD            Long          70700         48.7807
CFD            Long          14942         48.8814
CFD            Long          16000         48.9643
CFD            Long          800           49.215
CFD            Long          1282          49.2326
CFD            Long          16711         49.3311
CFD            Long          1200          49.34
CFD            Long          2880          49.4603
CFD            Short         28947         48.1486
CFD            Short         4025          48.2239
CFD            Short         3475          48.4302
CFD            Short         13018         48.4509
CFD            Short         62012         48.8849
CFD            Short         2482          49.18
CFD            Short         800           49.215
CFD            Short         18998         49.464
CFD            Short         2079          49.6494

(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 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           19/12/2008
Option            Purchased   200                    5,000.0000       EURO           19/09/2008
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   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