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               19 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      46,439,727      4.65%     1,699,813      0.17%
securities
(2) Derivatives    2,936,143      0.29%        72,990      0.01%
(other than
options)
(3) Options and      186,650      0.02%       100,810      0.01%
agreements to
purchase/sell
Total             49,562,520      4.97%     1,873,613      0.19%



(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      14,280                50.7000
Purchase      1,832                 52.0007
Purchase      1,302                 52.0007
Purchase      1,012                 52.0007
Purchase      15,900                52.3136
Purchase      442                   52.0007
Purchase      17,000                52.7300
Purchase      481                   52.0007
Purchase      238                   52.0007
Purchase      1,734                 52.0007
Purchase      14,295                52.7300
Purchase      21,242                51.3467
Purchase      193                   52.0007
Purchase      12,774                51.1225
Purchase      1,300                 53.1734
Purchase      12,600                52.2394
Purchase      90                    52.4968
Purchase      40,765                52.7300
Purchase      185                   52.1564
Purchase      594                   52.0007
Purchase      207                   52.0007
Purchase      3,406                 52.0537
Purchase      113,556               52.7300
Purchase      7,098                 52.0007
Purchase      4,096                 51.9844
Purchase      489                   52.0270
Purchase      43,280                51.5544
Purchase      762                   52.0007
Purchase      49,146                52.2906
Purchase      622                   52.0007
Purchase      232                   52.2472
Purchase      660                   Transfer
Purchase      3,000                 53.4267
Purchase      55,600                52.9304
Purchase      15                    51.7000
Sale          100                   51.8500
Sale          20                    52.1500
Sale          80                    52.2200
Sale          15                    51.7000
Sale          553                   51.9400
Sale          130                   52.0700
Sale          115                   51.9900
Sale          120                   52.0000
Sale          113,556               52.7300
Sale          145                   51.3700
Sale          131                   52.7316
Sale          100                   52.4100
Sale          115                   52.3260
Sale          3,811                 51.9869
Sale          54                    51.8900
Sale          14,280                50.7000
Sale          50                    51.5320
Sale          75                    53.1900
Sale          60                    52.3900
Sale          30                    51.6300
Sale          50                    51.4920
Sale          100                   52.0972
Sale          10,104                51.3948
Sale          125                   53.0000
Sale          14,295                52.7300
Sale          300                   50.9100
Sale          175                   51.9300
Sale          50                    52.9100
Sale          113,544               52.7300
Sale          200                   52.9100
Sale          55,124                51.4102
Sale          387                   51.9600
Sale          185                   51.4720
Sale          40,000                50.7000
Sale          100                   51.9000
Sale          1,667                 50.7000
Sale          40,765                52.7300
Sale          78                    52.0000
Sale          3,421                 50.7000
Sale          75                    52.1300
Sale          75                    52.0600
Sale          20                    53.1700
Sale          80                    52.0516
Sale          18,793                51.5919
Sale          23,194                51.5050
Sale          55,673                51.4212
Sale          150                   52.3356
Sale          80                    52.3800
Sale          100                   52.6000
Sale          300                   51.8000



(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         12774         51.1225
CFD            Short         43280         51.5543
CFD            Short         4096          51.9843
CFD            Short         3406          52.0536
CFD            Short         232           52.2471
CFD            Short         49146         52.2906
CFD            Short         15900         52.3136
CFD            Short         55600         52.9303
CFD            Short         1300          53.1734
CFD            Short         3000          53.4266
CFD            Long          10104         51.3948
CFD            Long          55124         51.4102
CFD            Long          55673         51.4211
CFD            Long          23194         51.5049
CFD            Long          18793         51.5919
CFD            Long          1683          52.0426
CFD            Long          340           52.404


(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                         20 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   150                    4,000.0000       EURO           20/03/2008
Option            Purchased   250                    3,000.0000       EURO           20/06/2008
Option            Purchased   250                    3,800.0000       EURO           20/06/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   20,000                 54.0000          AMER           18/04/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   45,000                 54.0000          AMER           20/03/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   -100,000               30.0000          AMER           20/06/2008
Option            Purchased   -300                   3,800.0000       EURO           20/06/2008
Option            Purchased   -250                   2,500.0000       EURO           20/06/2008
Option            Purchased   -250                   5,200.0000       EURO           20/03/2008
Option            Purchased   -10                    5,200.0000       EURO           19/12/2008
Option            Purchased   50                     5,400.0000       EURO           20/03/2008
Option            Purchased   20,000                 52.0000          AMER           18/04/2008


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