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               25 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      46,091,302      4.62%     2,093,721      0.21%
securities
(2) Derivatives    2,840,765      0.28%        91,401      0.01%
(other than
options)
(3) Options and      141,450      0.01%       100,560      0.01%
agreements to
purchase/sell
Total             49,073,517      4.92%     2,285,682      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      608                   49.8500
Purchase      3,028                 49.8500
Purchase      1,418                 49.8500
Purchase      785                   49.8500
Purchase      1,088                 49.8500
Purchase      25                    63.1600 EUR
Purchase      1,681                 49.2738
Purchase      495                   49.8500
Purchase      389                   49.8500
Purchase      11,660                49.6462
Purchase      150                   49.5620
Purchase      6,469                 49.8500
Purchase      3,900                 49.6101
Purchase      115                   49.2500
Purchase      100                   49.4500
Purchase      8,400                 49.3922
Purchase      240                   48.2468
Purchase      526                   49.4427
Purchase      192                   48.2468
Purchase      904                   49.8500
Purchase      310                   49.5500
Purchase      6,941                 49.2626
Purchase      1,395                 49.8500
Purchase      1,171                 49.5500
Purchase      395                   49.8500
Purchase      30,034                49.4664
Purchase      1,515                 49.2738
Purchase      482                   49.4600
Purchase      12,172                49.8500
Purchase      8,622                 49.8500
Purchase      2,475                 49.6643
Purchase      1,008                 49.8500
Purchase      100                   49.5700
Purchase      74,400                49.8500
Purchase      5,068                 49.2738
Purchase      221                   49.3400
Purchase      300                   49.5800
Purchase      105                   49.8500
Purchase      158                   49.8500
Purchase      134,109               49.0850
Sale          70                    49.4100
Sale          268                   49.8500
Sale          55                    49.5033
Sale          44,383                49.4604
Sale          838                   49.8500
Sale          732                   49.8500
Sale          482                   49.4600
Sale          30                    49.4100
Sale          200                   49.3619
Sale          100                   49.5632
Sale          8,622                 49.8500
Sale          100                   49.3700
Sale          50                    49.4100
Sale          117                   49.8500
Sale          563                   49.8500
Sale          100                   49.5432
Sale          75                    49.2524
Sale          95                    49.3816
Sale          50                    49.3808
Sale          847                   49.4100
Sale          80                    49.4100
Sale          109,919               49.4077
Sale          200                   49.7500
Sale          443                   49.8500
Sale          134,109               49.0850
Sale          7,704                 49.8500
Sale          852                   49.8500
Sale          40                    49.2925
Sale          30                    49.4100
Sale          41,246                49.8500
Sale          1,361                 49.3586
Sale          457                   49.8500
Sale          140                   49.4100
Sale          200                   49.2532
Sale          402                   49.4200
Sale          1,395                 49.8500
Sale          145                   49.4100
Sale          100                   49.2000
Sale          50                    49.4100
Sale          27,900                49.3222
Sale          120                   49.4100
Sale          1,210                 49.8500
Sale          150                   49.2000
Sale          240                   48.2468
Sale          100                   49.4832
Sale          61                    49.5700
Sale          482                   49.4600
Sale          140                   49.4100
Sale          60                    49.4100
Sale          192                   48.2468
Sale          100                   49.4120
Sale          6,789                 49.4888
Sale          50                    49.1900
Sale          115                   49.7600
Sale          20,431                49.8500
Sale          50                    49.4100
Sale          115                   49.1700
Sale          19,600                49.4852
Sale          50                    49.4100
Sale          40,000                49.8500
Sale          75                    49.7500
Sale          57                    49.4100
Sale          134,109               49.0850


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         6941          49.2626
CFD            Short         8400          49.3922
CFD            Short         30034         49.4663
CFD            Short         3900          49.61
CFD            Short         11660         49.6461
CFD            Short         2475          49.6642
CFD            Short         1418          49.85
CFD            Long          27900         49.3222
CFD            Long          1361          49.3586
CFD            Long          200           49.3619
CFD            Long          109919        49.4076
CFD            Long          44383         49.4604
CFD            Long          19600         49.4851
CFD            Long          6789          49.4888
CFD            Long          61            49.57


(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                         26 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