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               03 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      46,643,649      4.68%     1,186,376      0.12%
securities
(2) Derivatives    2,405,281      0.24%        76,724      0.01%
(other than
options)
(3) Options and      146,650      0.01%       100,810      0.01%
agreements to
purchase/sell
Total             49,195,580      4.93%     1,363,910      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      1,508                    57.2000
Purchase      4,068                    56.6085
Purchase      5,000                    56.0000
Purchase      100                      55.5500
Purchase      234                      57.2000
Purchase      682                      56.0329
Purchase      367                      55.7450
Purchase      134                      57.2000
Purchase      525                      57.2000
Purchase      10,000                   56.6000
Purchase      66                       57.2000
Purchase      283                      56.1800
Purchase      1,170                    56.6000
Purchase      800                      56.4985
Purchase      361                      57.2000
Purchase      1,541                    56.1488
Purchase      1,790                    56.4314
Purchase      5,429                    56.8950
Purchase      13,603                   56.1461
Purchase      82                       57.2000
Purchase      160                      57.2000
Purchase      5,071                    57.2000
Purchase      11,100                   56.4443
Purchase      34,640                   56.7727
Sale          195                      55.7459
Sale          2,557                    56.2454
Sale          1,241                    56.6088
Sale          150                      56.9700
Sale          1,000                    56.7750
Sale          7,030                    55.9040
Sale          150                      56.9200
Sale          175                      56.0500
Sale          150                      55.9600
Sale          7,445                    57.2000
Sale          63                       56.0600
Sale          59                       56.0512
Sale          105                      55.8800
Sale          35                       55.8217
Sale          73                       55.8600
Sale          80                       55.9440
Sale          1,714                    56.2454
Sale          1,938                    56.2778
Sale          115                      55.9500
Sale          25                       55.9400
Sale          5,071                    57.2000
Sale          204                      56.2454
Sale          50                       55.6116
Sale          132                      56.0600
Sale          2,300                    55.5994
Sale          10,188                   56.6000
Sale          10,590                   55.5781
Sale          181                      55.7459
Sale          216                      57.1000
Sale          200                      55.9600
Sale          100                      56.5700
Sale          558                      56.5195
Sale          100                      56.4600
Sale          195                      56.2454
Sale          199                      55.5200
Sale          145                      55.8600
Sale          100                      55.6499
Sale          290                      56.3600
Sale          349                      56.2454
Sale          150                      56.5900
Sale          60                       57.1023
Sale          364                      55.6600
Sale          200                      56.2454
Sale          53,325                   55.9093
Sale          100                      55.8400
Sale          50                       56.4600
Sale          415                      56.0900
Sale          150                      56.9348
Sale          69                       Transfer
Sale          1,170                    56.6000
Sale          90                       55.5932
Sale          5,071                    57.2000
Sale          160                      56.1540
Sale          100                      55.9600
Sale          210                      56.2454
Sale          100                      55.6100
Sale          4                        7.1300
Sale          1,323                    56.2454
Sale          1,101                    56.6000
Sale          255                      56.2454

NB: The below transactions which were previously disclosed have been cancelled
Deal Date  Purchase/Sale Number of Securities Price per unit (GBP)
26/02/2008 Purchase      64,000               57.4619

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         682           56.0329
CFD            Short         13603         56.1461
CFD            Short         1541          56.1488
CFD            Short         1790          56.4314
CFD            Short         11100         56.4442
CFD            Short         800           56.4984
CFD            Short         4068          56.6084
CFD            Short         34640         56.7726
CFD            Short         5429          56.895
CFD            Long          10590         55.578
CFD            Long          2300          55.5994
CFD            Long          7030          55.904
CFD            Long          53325         55.9092
CFD            Long          1938          56.2778
CFD            Long          558           56.5194
CFD            Long          1241          56.6088

(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


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.

None

Is a Supplemental Form 8 attached? (Note 9)                 YES


Date of disclosure                         04 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                    3,000.0000       EURO           20/06/2008
Option            Purchased   250                    3,800.0000       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                   5,200.0000       EURO           20/03/2008
Option            Purchased   -250                   2,500.0000       EURO           20/06/2008
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