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               06 May 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      46,800,436      4.69%     1,340,655      0.13%
securities
(2) Derivatives    2,813,710      0.28%       191,323      0.02%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,715,596      4.98%     1,673,058      0.17%


(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         787                   62.5629
Purchase         104                   Transfer
Purchase         3,270                 63.5400
Purchase         1,700                 62.7069
Purchase         1,251                 62.9126
Purchase         3,767                 63.1217
Purchase         536                   62.8486
Purchase         4,673                 62.5876
Purchase         493                   62.5629
Purchase         397                   62.8486
Purchase         1,039                 62.9126
Purchase         7,779                 62.5868
Purchase         627                   62.8486
Purchase         1,420                 62.8486
Purchase         3,537                 62.5682
Purchase         996                   62.8486
Purchase         253                   62.8486
Purchase         472                   62.8486
Purchase         617                   62.8486
Purchase         64,901                62.6286
Purchase         2,233                 62.8486
Purchase         5,896                 62.8486
Purchase         15,057                63.0316
Purchase         330                   Transfer
Purchase         48,000                63.5422
Purchase         800                   62.4632
Purchase         2,194                 62.8486
Purchase         295                   62.5629
Purchase         942                   63.3583
Purchase         531                   62.8486
Purchase         1,159                 62.5629
Purchase         652                   62.8486
Purchase         908                   62.8486
Purchase         1,700                 63.0128
Purchase         40,000                62.9423
Purchase         282                   62.5629
Purchase         584                   63.5400
Purchase         368                   62.5629
Purchase         1,307                 62.8486
Purchase         261                   62.5629
Purchase         40,000                62.9526
Purchase         1,522                 62.5629
Purchase         239                   62.5629
Purchase         258                   62.5361
Purchase         167                   62.4300
Purchase         504                   62.5629
Purchase         83,151                62.8613
Purchase         2,583                 62.8486
Purchase         448                   62.5629
Purchase         21,191                63.3659
Purchase         363                   62.5506
Purchase         55                    62.6170
Purchase         121                   62.5542
Purchase         236                   62.8486
Purchase         1,054                 63.5400
Purchase         16,000                63.0611
Sale             155                   62.4724
Sale             50                    62.8746
Sale             75                    62.4920
Sale             22,692                62.7230
Sale             65                    62.4800
Sale             50                    63.0330
Sale             60                    62.9030
Sale             3,240                 62.4839
Sale             3,537                 62.5698
Sale             75                    62.3816
Sale             451                   62.8047
Sale             100                   62.9904
Sale             104                   Transfer
Sale             27                    Transfer
Sale             137                   Transfer
Sale             21,100                62.6357
Sale             41                    62.8575
Sale             2,792                 62.7081
Sale             88                    62.5000
Sale             32                    63.1100
Sale             50                    63.1100
Sale             80                    63.1100
Sale             50                    63.1100
Sale             50                    62.6636
Sale             125                   62.4816
Sale             100                   62.6120
Sale             35                    63.1100
Sale             70                    62.4224
Sale             50                    63.1100
Sale             88                    62.8830
Sale             153                   62.9030
Sale             85                    63.3000
Sale             161                   62.4300
Sale             30                    79.0000 EUR
Sale             584                   63.5400
Sale             339                   62.2600
Sale             82                    62.3030
Sale             50                    62.5000
Sale             75                    62.9460
Sale             100                   62.5000
Sale             50                    62.5000
Sale             250                   62.5000
Sale             100                   62.8624
Sale             80                    62.5000
Sale             20,514                63.5400
Sale             50                    63.1100
Sale             75                    62.7700
Sale             35                    63.1100
Sale             50                    62.5000
Sale             50                    62.8746
Sale             3,899                 62.4830
Sale             40                    62.5245
Sale             545                   62.5300
Sale             60                    62.5000
Sale             30                    63.1100
Sale             50                    63.0330
Sale             40                    62.4600

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          3240          62.4838
CFD            Long          43            62.5679
CFD            Long          1194          62.5694
CFD            Long          265           62.5695
CFD            Long          21100         62.6356
CFD            Long          2792          62.7081
CFD            Long          22692         62.7229
CFD            Long          451           62.8047
CFD            Short         800           62.4632
CFD            Short         121           62.5542
CFD            Short         2882          62.5573
CFD            Short         7779          62.5868
CFD            Short         64901         62.6286
CFD            Short         83151         62.8612
CFD            Short         1700          63.0128
CFD            Short         15057         63.0315
CFD            Short         3767          63.1217
CFD            Short         942           63.3583
CFD            Short         21191         63.3659

(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                         07 May 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   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   250                    3,800.0000       EURO           20/06/2008
Option            Purchased   250                    3,000.0000       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
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

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