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               17 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      46,677,030       4.66%      738,536      0.07%
securities
(2) Derivatives      571,580       0.06%    2,059,324      0.21%
(other than
options)
(3) Options and      101,200       0.01%      151,400      0.02%
agreements to
purchase/sell
Total             47,349,810       4.73%    2,949,260      0.29%


(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         49                    Transfer
Purchase         2,327                 38.7200
Purchase         1,200                 38.5458
Purchase         30,400                38.7200
Purchase         104,953               38.2380
Purchase         595,090               39.4626
Purchase         4,625                 36.8804
Purchase         56,649                38.9171
Purchase         46,759                36.5000
Purchase         3,123                 38.7564
Purchase         11,790                38.1496
Purchase         15,714                36.5000
Purchase         1,328                 36.5000
Purchase         50                    36.3176
Purchase         2,548                 40.3757
Purchase         35,232                36.5000
Purchase         30                    50.7000 EUR
Purchase         24,972                38.6316
Purchase         160                   36.6300
Purchase         20,500                39.7073
Purchase         120                   40.8700
Purchase         3,355                 41.5829
Purchase         138                   36.5000
Purchase         534                   41.0900
Purchase         1,485                 38.7200
Purchase         30                    48.0000 EUR
Sale             16                    Transfer
Sale             50,897                39.8052
Sale             595,090               39.4626
Sale             43                    40.5000
Sale             45                    Transfer
Sale             846                   40.3421
Sale             5,614                 37.7177
Sale             103,202               41.1749
Sale             45                    Transfer
Sale             20,000                36.4945
Sale             2,327                 38.7200
Sale             110                   Transfer
Sale             1,120                 38.6137
Sale             42                    Transfer
Sale             3,344                 36.5000
Sale             1,078                 36.5000
Sale             75                    41.2700
Sale             4,659                 36.5000
Sale             125                   41.2700
Sale             30,400                38.7200
Sale             76                    Transfer
Sale             1,485                 38.7200
Sale             116                   39.7100
Sale             9,955                 40.5045
Sale             135,450               40.3246
Sale             19                    39.9600
Sale             35,833                39.3576
Sale             243                   40.3300
Sale             4,216                 39.2282
Sale             1,485                 43.7967
Sale             661                   36.5000
Sale             7,099                 39.1970
Sale             2,300                 39.9324
Sale             30,400                41.6500
Sale             21,375                38.6536
Sale             95                    38.5310
Sale             49                    Transfer
Sale             3,480                 41.1550


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          20000         36.4945
CFD            Long          5614          37.7177
CFD            Long          1120          38.6136
CFD            Long          21375         38.6536
CFD            Long          595090        39.4626
CFD            Long          50897         39.8051
CFD            Long          2300          39.9324
CFD            Long          135450        40.3245
CFD            Long          846           40.3421
CFD            Long          9955          40.5045
CFD            Long          4695          41.1024
CFD            Long          103202        41.1749
CFD            Short         4625          36.8804
CFD            Short         11790         38.1495
CFD            Short         104953        38.238
CFD            Short         1200          38.5457
CFD            Short         24972         38.6316
CFD            Short         3123          38.7564
CFD            Short         56649         38.9171
CFD            Short         595090        39.4626
CFD            Short         20500         39.7072

(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                         18 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                56.0000          AMER           18/12/2009
Option            Purchased   -50,000                64.0000          AMER           21/11/2008
Option            Purchased   -100,000               64.0000          AMER           21/11/2008
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   -270                   6,400.0000       EURO           19/12/2008
Option            Purchased   -350                   5,000.0000       EURO           19/12/2008
Option            Purchased   -500                   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