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               21 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      46,319,694       4.64%      849,386      0.09%
securities
(2) Derivatives      599,414       0.06%    1,787,487      0.18%
(other than
options)
(3) Options and      101,400       0.01%      101,650      0.01%
agreements to
purchase/sell
Total             47,020,508       4.71%    2,738,523      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         7,112                 51.5573
Purchase         5,325                 51.4217
Purchase         15,676                50.3014
Purchase         67                    51.1940
Purchase         22,000                50.3772
Purchase         9,652                 51.3253
Purchase         80,000                50.6080
Purchase         10,500                51.6574
Purchase         2,457                 51.5405
Purchase         39,000                51.4200
Purchase         7,393                 51.0491
Purchase         1,326                 51.4200
Purchase         100                   51.4655
Purchase         329                   50.7953
Purchase         275                   51.4200
Purchase         398                   51.3300
Purchase         21,992                51.4200
Purchase         10,736                51.4200
Purchase         205                   50.7953
Purchase         358                   50.7953
Purchase         1,227                 50.7169
Sale             300                   50.7729
Sale             14,300                50.7348
Sale             9,652                 51.3253
Sale             34,040                50.6296
Sale             80,000                50.6080
Sale             1,048                 51.5400
Sale             15,750                51.1970
Sale             329                   51.5100
Sale             26                    50.7116
Sale             15,676                50.3014
Sale             2,013                 51.7472
Sale             63,196                51.0388
Sale             9,652                 51.3253
Sale             83,560                50.6315
Sale             300                   50.7729
Sale             121                   51.4800
Sale             11                    49.7800
Sale             196                   49.4205
Sale             45                    64.7000 EUR
Sale             56                    51.4945
Sale             38                    Transfer
Sale             100                   49.2545
Sale             2,098                 50.9510
Sale             26,704                51.4200
Sale             100                   50.5975
Sale             300                   50.7000
Sale             15,676                50.3014

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          34040         50.6295
CFD            Long          83560         50.6315
CFD            Long          26            50.7115
CFD            Long          14300         50.7348
CFD            Long          2098          50.951
CFD            Long          63196         51.0387
CFD            Long          15750         51.197
CFD            Long          763           51.365
CFD            Long          2013          51.7471
CFD            Short         22000         50.3771
CFD            Short         9489          50.8493
CFD            Short         7393          51.0491
CFD            Short         5325          51.4216
CFD            Short         2457          51.5405
CFD            Short         7112          51.5573
CFD            Short         10500         51.6574

(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                         22 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