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               26 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      46,162,955      4.63%     2,046,626      0.21%
securities
(2) Derivatives    2,776,808      0.28%       145,710      0.01%
(other than
options)
(3) Options and      141,450      0.01%       100,560      0.01%
agreements to
purchase/sell
Total             49,081,213      4.92%     2,292,896      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      168                   50.5000
Purchase      100                   50.1900
Purchase      38                    Transfer
Purchase      716                   50.5000
Purchase      300                   50.3200
Purchase      198                   49.6400
Purchase      45                    Transfer
Purchase      609                   50.5000
Purchase      774                   48.6136
Purchase      106,368               50.3877
Purchase      15                    49.9400
Purchase      402                   50.5800
Purchase      4,800                 50.4899
Purchase      12,691                50.1603
Purchase      1,298                 49.0100
Purchase      6,000                 48.0000
Purchase      551                   49.0100
Purchase      313                   49.0100
Purchase      50                    62.7000 EUR
Purchase      2,711                 50.3396
Purchase      29,000                50.3309
Sale          9,386                 50.4440
Sale          2,000                 50.4644
Sale          2,247                 50.4440
Sale          1,546                 50.4440
Sale          52                    50.5300
Sale          100                   50.6612
Sale          419                   50.4440
Sale          100                   50.5600
Sale          559                   50.2600
Sale          125                   50.1900
Sale          10,634                50.5000
Sale          17,375                50.6241
Sale          16,615                50.3378
Sale          31                    50.1820
Sale          150                   50.2300
Sale          116                   50.3100
Sale          150                   50.7149
Sale          2,800                 50.2533
Sale          20                    50.2100
Sale          45                    Transfer
Sale          774                   48.6136
Sale          19                    50.3300
Sale          16,000                50.5000
Sale          160                   50.1500
Sale          150                   49.8300
Sale          130                   49.8300
Sale          50                    49.8300
Sale          37                    50.1500
Sale          100                   50.3100
Sale          700                   50.5700
Sale          100                   50.3000
Sale          85                    50.0600
Sale          288                   50.2742
Sale          486                   50.4440
Sale          623                   50.4440
Sale          764                   50.4440
Sale          6,000                 48.0000
Sale          779                   50.4587
Sale          250                   50.6200
Sale          496                   50.4440
Sale          191                   49.6400
Sale          33                    50.4440
Sale          210                   50.4440
Sale          120                   50.1008
Sale          70                    50.3100
Sale          405                   50.4440
Sale          100                   50.1424
Sale          301                   50.4440
Sale          93                    50.2635
Sale          95                    49.9000
Sale          350                   50.3800
Sale          75                    49.9000
Sale          671                   50.4440
Sale          7                     49.6400
Sale          100                   49.7900
Sale          212                   50.3687


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         273           50.0599
CFD            Short         12691         50.1602
CFD            Short         1363          50.2592
CFD            Short         29000         50.3309
CFD            Short         2711          50.3396
CFD            Short         106368        50.3876
CFD            Short         4800          50.4899
CFD            Long          2800          50.2533
CFD            Long          16615         50.3377
CFD            Long          2000          50.4644
CFD            Long          17375         50.624
CFD            Long          150           50.7149


(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                         27 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