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 April 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      46,127,013      4.62%     1,849,832      0.19%
securities
(2) Derivatives    3,097,385      0.31%        45,805      0.00%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,325,848      4.94%     2,036,717      0.20%


(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                 503                    63.1801
Purchase                 6,041                  62.2693
Purchase                 3,000                  62.9993
Purchase                 2,442                  63.3083
Purchase                 5,474                  62.836
Purchase                 1,600                  62.3249
Purchase                 5,297                  62.834
Purchase                 25,214                 63.2165
Purchase                 999                    63.1439
Purchase                 800                    62.8911
Purchase                 1,300                  63.1219
Purchase                 398                    61.93
Purchase                 60                     62.7
Purchase                 76                     61.93
Purchase                 1,015                  61.93
Purchase                 14,286                 62.675
Purchase                 225                    61.93
Purchase                 24,338                 62.26
Purchase                 2,172                  62.8869
Sale                     194                    Transfer
Sale                     58                     Transfer
Sale                     90                     Transfer
Sale                     40                     Transfer
Sale                     120                    Transfer
Sale                     166                    Transfer
Sale                     140                    Transfer
Sale                     128                    Transfer
Sale                     80                     Transfer
Sale                     8,370                  62.8733
Sale                     108                    Transfer
Sale                     84                     Transfer
Sale                     94                     Transfer
Sale                     104                    Transfer
Sale                     80                     Transfer
Sale                     96                     Transfer
Sale                     178                    Transfer
Sale                     24                     Transfer
Sale                     110                    Transfer
Sale                     38                     Transfer
Sale                     118                    Transfer
Sale                     158                    Transfer
Sale                     60                     Transfer
Sale                     40                     Transfer
Sale                     76                     Transfer
Sale                     50                     Transfer
Sale                     60                     Transfer
Sale                     134                    Transfer
Sale                     294                    63.14
Sale                     58                     Transfer
Sale                     7,763                  62.8824
Sale                     42                     Transfer
Sale                     72                     Transfer
Sale                     48                     Transfer
Sale                     46                     Transfer
Sale                     202                    Transfer
Sale                     82                     Transfer
Sale                     50                     Transfer
Sale                     72                     Transfer
Sale                     46                     Transfer
Sale                     16                     Transfer
Sale                     108                    Transfer
Sale                     80                     Transfer
Sale                     86                     Transfer
Sale                     86                     Transfer
Sale                     108                    Transfer
Sale                     130                    Transfer
Sale                     102                    Transfer
Sale                     440                    Transfer
Sale                     156                    Transfer
Sale                     6,757                  62.6507
Sale                     54                     Transfer
Sale                     66                     Transfer
Sale                     372                    Transfer
Sale                     56                     Transfer
Sale                     208                    Transfer
Sale                     130                    Transfer
Sale                     84                     Transfer
Sale                     20,880                 62.6654
Sale                     160                    Transfer
Sale                     34                     Transfer
Sale                     86                     Transfer
Sale                     106                    Transfer
Sale                     200                    Transfer
Sale                     32                     Transfer
Sale                     64                     Transfer
Sale                     76                     Transfer
Sale                     66                     Transfer
Sale                     80                     Transfer
Sale                     104                    Transfer
Sale                     136                    Transfer
Sale                     38                     Transfer
Sale                     1,600                  62.0696
Sale                     50                     62.366
Sale                     70                     Transfer
Sale                     152                    Transfer
Sale                     58                     Transfer
Sale                     30                     Transfer
Sale                     460                    Transfer
Sale                     34                     Transfer
Sale                     46                     Transfer
Sale                     100                    63.1175
Sale                     1,276                  63.1755
Sale                     52                     78.76
Sale                     145                    62.524
Sale                     75                     63.1424
Sale                     34                     63.1344
Sale                     13,100                 62.26
Sale                     100                    62.566
Sale                     125                    63.1345
Sale                     180                    62.7348
Sale                     35                     63.1646
Sale                     13,828                 62.26
Sale                     250                    62.6315
Sale                     242                    62.69
Sale                     120                    62.8132
Sale                     225                    63.053
Sale                     144                    Transfer
Sale                     159                    62.685
Sale                     148                    Transfer
Sale                     922                    Transfer
Sale                     64                     Transfer
Sale                     956                    Transfer
Sale                     61                     Transfer
Sale                     6,000                  62.26
Sale                     46                     Transfer
Sale                     50                     Transfer
Sale                     8,574                  62.6515
Sale                     26                     Transfer
Sale                     76                     Transfer
Sale                     34                     Transfer
Sale                     162                    Transfer
Sale                     7,000                  62.1413
Sale                     46                     Transfer
Sale                     173                    63.1699
Sale                     780                    Transfer
Sale                     44                     Transfer
Sale                     476                    Transfer
Sale                     114                    Transfer
Sale                     112                    Transfer
Sale                     10,039                 62.2488
Sale                     102                    Transfer
Sale                     32                     Transfer
Sale                     58                     Transfer
Sale                     108                    Transfer
Sale                     198                    Transfer
Sale                     188                    62.2313
Sale                     80                     Transfer
Sale                     174                    Transfer
Sale                     166                    Transfer
Sale                     184                    Transfer
Sale                     36                     Transfer
Sale                     138                    Transfer
Sale                     66                     Transfer
Sale                     1,000                  Transfer
(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          188           62.2313
CFD            Long          10039         62.2487
CFD            Long          6757          62.6507
CFD            Long          8574          62.6514
CFD            Long          20880         62.6653
CFD            Long          8370          62.8733
CFD            Long          173           63.1698
CFD            Short         6041          62.2693
CFD            Short         14286         62.675
CFD            Short         5297          62.834
CFD            Short         5474          62.836
CFD            Short         800           62.8911
CFD            Short         3000          62.9993
CFD            Short         1300          63.1219
CFD            Short         999           63.1438
CFD            Short         25214         63.2164
CFD            Short         2442          63.3083

(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                         29 April 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   -145                   5,200.0000       EURO           19/12/2008
Option            Purchased   -250                   5,200.0000       EURO           19/09/2008
Option            Purchased   -250                   2,500.0000       EURO           20/06/2008
Option            Purchased   -300                   3,800.0000       EURO           20/06/2008
Option            Purchased   -2,000                 70.0000          AMER           20/06/2008
Option            Purchased   -38,000                70.0000          AMER           20/06/2008
Option            Purchased   -100,000               30.0000          AMER           20/06/2008
Option            Purchased   100,000                56.0000          AMER           18/12/2009
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   -135                   5,200.0000       EURO           19/12/2008

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