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               28 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      45,997,349      4.61%     2,108,570      0.21%
securities
(2) Derivatives    2,819,053      0.28%        90,662      0.01%
(other than
options)
(3) Options and      141,450      0.01%       100,560      0.01%
agreements to
purchase/sell
Total             48,957,852      4.91%      2,299,792     0.23%


(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      3,300                 52.1234
Purchase      198                   52.1234
Purchase      370                   52.1234
Purchase      1,283                 52.1234
Purchase      3,683                 52.1669
Purchase      594                   51.4113
Purchase      266                   52.1234
Purchase      351                   52.1234
Purchase      311                   52.1234
Purchase      168                   51.6700
Purchase      550                   52.1234
Purchase      522                   52.1234
Purchase      8,386                 52.1234
Purchase      4,872                 51.6778
Purchase      776                   51.6700
Purchase      8,802                 51.6700
Purchase      5,280                 51.6056
Purchase      133                   51.5529
Purchase      125                   52.5860
Purchase      172                   52.7000
Purchase      362                   52.1234
Purchase      667                   52.1234
Purchase      2,959                 51.6700
Purchase      13,343                51.7226
Purchase      4,101                 51.6700
Purchase      2,396                 51.6700
Purchase      29,343                51.6700
Purchase      454                   52.1234
Purchase      661                   52.1234
Purchase      1,357                 52.1234
Purchase      19,020                52.2225
Purchase      91,622                52.1512
Purchase      174                   51.7300
Purchase      14,907                51.7364
Sale          34,100                51.8173
Sale          105                   52.4800
Sale          225                   52.8500
Sale          20,682                51.5500
Sale          22,000                51.9819
Sale          22                    52.1800
Sale          13,515                51.7238
Sale          26                    51.4400
Sale          200                   51.5873
Sale          1,600                 51.7300
Sale          5,033                 51.8389
Sale          190                   52.4800
Sale          575                   51.9914
Sale          27,190                51.6334
Sale          328                   51.7842
Sale          4,400                 52.0237
Sale          4,724                 52.1810
Sale          4,268                 51.8271
Sale          65                    51.9900
Sale          2,396                 51.6700
Sale          24,672                52.3304
Sale          16,659                52.3304
Sale          11,533                51.6700
Sale          145                   52.3300
Sale          250                   51.4800
Sale          220                   52.3300
Sale          90                    52.5048
Sale          88                    52.5048
Sale          50                    51.6332
Sale          100                   52.7900
Sale          40                    51.8200
Sale          206                   52.1478
Sale          130                   51.6048
Sale          90                    52.4800
Sale          8,220                 51.4113
Sale          100                   51.6208
Sale          523                   51.6700
Sale          73,814                50.5000
Sale          150                   52.8600
Sale          32                    50.7548
Sale          90                    52.3300
Sale          100                   52.2200
Sale          125                   52.2700
Sale          78                    51.4400
Sale          50                    52.4800
Sale          375                   52.4800
Sale          65                    51.4740

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          137           51.5355
CFD            Long          27190         51.6334
CFD            Long          1600          51.73
CFD            Long          34100         51.8172
CFD            Long          5033          51.8389
CFD            Long          359           51.9701
CFD            Long          575           51.9914
CFD            Long          4400          52.0236
CFD            Long          4724          52.1809
CFD            Short         4872          51.6777
CFD            Short         14907         51.7363
CFD            Short         91622         52.1511
CFD            Short         3683          52.1669
CFD            Short         19020         52.2225

(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                         31 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