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 March 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      46,947,131      4.71%     1,265,144      0.13%
securities
(2) Derivatives    2,510,392      0.25%        53,253      0.01%
(other than
options)
(3) Options and      146,650      0.01%       100,810      0.01%
agreements to
purchase/sell
Total              49,604,173     4.97%     1,419,207      0.14%


(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      4,520                 53.6818
Purchase      34                    71.4700 EUR
Purchase      9,283                 55.9400
Purchase      172                   53.9800
Purchase      1,350                 53.6818
Purchase      3,819                 53.3461
Purchase      23,218                53.4429
Purchase      263                   53.2380
Purchase      3,978                 52.5879
Purchase      1,109                 53.0325
Purchase      584                   56.2000
Purchase      2,005                 53.6818
Purchase      2,700                 53.2829
Purchase      6,813                 53.1897
Purchase      871                   52.7626
Purchase      20,000                53.6900
Purchase      438                   53.2380
Purchase      9,622                 53.3233
Sale          1,500                 52.5800
Sale          150                   53.4500
Sale          185                   53.4500
Sale          75                    53.6820
Sale          134                   Transfer
Sale          6,964                 53.1197
Sale          21,595                53.3993
Sale          55                    53.3300
Sale          80                    53.2016
Sale          250                   53.4500
Sale          58                    53.8400
Sale          65                    53.6912
Sale          110                   52.8400
Sale          34,060                53.3731
Sale          75                    53.4500
Sale          100                   53.4500
Sale          9                     53.3800
Sale          140                   53.4500
Sale          250                   53.4900
Sale          60                    53.6500
Sale          70                    53.4500
Sale          253                   53.9600
Sale          250                   53.4500
Sale          200                   53.4500
Sale          250                   53.3500
Sale          52                    53.0415
Sale          1,597                 53.2256
Sale          6,769                 52.5800
Sale          100                   53.6000
Sale          100                   53.4600
Sale          50                    53.4500
Sale          210                   53.8500
Sale          19                    53.7600
Sale          130                   53.3724
Sale          5,563                 53.4217
Sale          32,700                53.6716
Sale          220                   53.2000
Sale          809                   53.6450
Sale          155                   53.4500
Sale          65                    53.3800
Sale          56                    Transfer
Sale          300                   53.4500
Sale          115                   53.2600
Sale          300                   53.4500
Sale          80                    53.2500
Sale          100                   53.7812
Sale          222                   53.4500
Sale          110                   53.4500

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         3978         52.5878
CFD            Short         1109         53.0324
CFD            Short         6813         53.1896
CFD            Short         2700         53.2829
CFD            Short         9622         53.3232
CFD            Short         3819         53.3461
CFD            Short         23218        53.4429
CFD            Long          6964         53.1197
CFD            Long          34060        53.3731
CFD            Long          21595        53.3993
CFD            Long          5563         53.4217
CFD            Long          809          53.645

(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 March 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   45,000                 54.0000          AMER           20/03/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   250                    3,800.0000       EURO           20/06/2008
Option            Purchased   250                    3,000.0000       EURO           20/06/2008
Option            Purchased   150                    4,000.0000       EURO           20/03/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   50                     5,400.0000       EURO           20/03/2008
Option            Purchased   -10                    5,200.0000       EURO           19/12/2008
Option            Purchased   -250                   2,500.0000       EURO           20/06/2008
Option            Purchased   -250                   5,200.0000       EURO           20/03/2008
Option            Purchased   -300                   3,800.0000       EURO           20/06/2008
Option            Purchased   -100,000               30.0000          AMER           20/06/2008


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