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               10 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      46,415,794       4.65%      801,259      0.08%
securities
(2) Derivatives      646,624       0.06%    1,898,883      0.19%
(other than
options)
(3) Options and      101,200       0.01%      101,400      0.01%
agreements to
purchase/sell
Total             47,163,618       4.73%    2,801,542      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         1,061                 42.6500
Purchase         1,241                 42.0926
Purchase         1,000                 41.1306
Purchase         24,255                41.4242
Purchase         850                   41.5100
Purchase         196                   41.6842
Purchase         7,644                 42.0929
Purchase         33,234                41.5271
Purchase         2,774                 41.9585
Purchase         55                    Transfer
Purchase         20,952                44.9000
Purchase         43                    Transfer
Purchase         5,500                 40.7556
Purchase         704                   42.3715
Purchase         12,194                42.3236
Purchase         152                   42.2111
Purchase         500                   41.8716
Purchase         141,900               41.5100
Purchase         19,000                41.5100
Purchase         3,055                 41.5100
Purchase         16,041                41.9985
Purchase         4,900                 40.7556
Purchase         32                    Transfer
Purchase         248,102               41.6831
Purchase         900                   41.1306
Sale             65,046                41.9164
Sale             83                    42.1640
Sale             10,189                41.7091
Sale             122                   Transfer
Sale             43                    Transfer
Sale             32                    Transfer
Sale             71                    Transfer
Sale             235                   Transfer
Sale             15,797                41.5100
Sale             3,055                 41.5100
Sale             30                    51.6000 EUR
Sale             30                    52.5000 EUR
Sale             75                    41.7132
Sale             100                   42.1748
Sale             141,900               41.5100
Sale             6,500                 43.0329
Sale             120                   42.4300
Sale             11,000                42.4273
Sale             55                    Transfer
Sale             126                   Transfer
Sale             54                    Transfer
Sale             59,273                41.7339
Sale             500                   41.1338
Sale             35                    Transfer
Sale             80,729                41.4090
Sale             100                   40.9724

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          500           41.1338
CFD            Long          80729         41.4089
CFD            Long          7751          41.694
CFD            Long          10189         41.709
CFD            Long          59273         41.7338
CFD            Long          65046         41.9163
CFD            Long          11000         42.4272
CFD            Long          6500          43.0329
CFD            Short         24255         41.4242
CFD            Short         33234         41.527
CFD            Short         248102        41.683
CFD            Short         196           41.6842
CFD            Short         2774          41.9584
CFD            Short         16041         41.9984
CFD            Short         1241          42.0926
CFD            Short         7644          42.0928
CFD            Short         12194         42.3235

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

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