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               27 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      46,018,854      4.61%     2,159,938      0.22%
securities
(2) Derivatives    2,870,120      0.29%        85,743      0.01%
(other than
options)
(3) Options and      141,450      0.01%       100,560      0.01%
agreements to
purchase/sell
Total             49,030,424      4.91%     2,346,241      0.24%


(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      250                   51.3400
Purchase      4,834                 51.5577
Purchase      45                    Transfer
Purchase      200                   50.3183
Purchase      12,600                51.5500
Purchase      1,092                 51.2984
Purchase      120                   51.5400
Purchase      21,479                51.6094
Purchase      6,800                 51.5914
Purchase      150                   51.3500
Purchase      20,682                51.5500
Purchase      73,814                50.5000
Purchase      2,602                 51.5254
Purchase      198                   51.5500
Purchase      200                   50.5766
Purchase      13                    51.5000
Purchase      1,200                 51.6598
Sale          2,000                 51.6683
Sale          626                   51.2500
Sale          1,144                 51.5500
Sale          120                   51.7500
Sale          5,658                 51.7948
Sale          2,602                 51.6281
Sale          20,000                51.5500
Sale          16,695                51.7203
Sale          52                    50.2300
Sale          128,072               51.5001
Sale          25                    50.9400
Sale          400                   51.6902
Sale          12                    49.5500
Sale          32                    51.5800
Sale          100                   50.3200
Sale          20                    51.5300
Sale          260                   51.5500
Sale          73,814                50.5000
Sale          200                   50.7700
Sale          100                   51.6700
Sale          44                    51.4400
Sale          120                   50.7820
Sale          100                   51.8200
Sale          42                    51.4000
Sale          100                   51.9024
Sale          45                    Transfer
Sale          150                   51.9300
Sale          36,059                51.4234
Sale          79                    51.8100
Sale          200                   51.3700
Sale          318                   51.3100
Sale          575                   51.5200
Sale          125                   51.5200
Sale          120                   51.6100
Sale          184                   51.4700
Sale          77                    51.5216
Sale          110                   51.3632

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          36059         51.4233
CFD            Long          128072        51.5001
CFD            Long          2602          51.6281
CFD            Long          2000          51.6682
CFD            Long          400           51.6901
CFD            Long          16695         51.7203
CFD            Long          5658          51.7948
CFD            Short         200           50.3183
CFD            Short         1092          51.2983
CFD            Short         2602          51.5253
CFD            Short         4834          51.5577
CFD            Short         6800          51.5913
CFD            Short         21479         51.6093
CFD            Short         120           51.6598


(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                         28 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   20,000                 52.0000          AMER           18/04/2008
Option            Purchased   20,000                 54.0000          AMER           18/04/2008
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   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   -10                    5,200.0000       EURO           19/12/2008
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