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               08 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      45,905,133      4.60%     2,146,702      0.22%
securities
(2) Derivatives    2,960,367      0.30%        51,304      0.01%
(other than
options)
(3) Options and      141,450      0.01%       101,080      0.01%
agreements to
purchase/sell
Total             49,006,950      4.91%     2,299,086      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           1,917               57.1907
Purchase           441                 57.1907
Purchase           240                 57.1907
Purchase           2,400               57.3253
Purchase           308                 57.1907
Purchase           179                 57.1907
Purchase           2,916               57.7217
Purchase           10,128              57.2221
Purchase           3,171               59.01
Purchase           471                 57.1907
Purchase           292                 57.1907
Purchase           4,965               57.1907
Purchase           719                 57.1907
Purchase           16,099              59.01
Purchase           96,239              58.7174
Purchase           14,574              59.01
Purchase           35,000              57.3963
Purchase           23,158              58.7582
Purchase           50                  71.9 EUR
Purchase           712                 57.2314
Purchase           212                 57.1907
Purchase           714                 58.2341
Purchase           62,940              57.288
Purchase           334                 59.01
Purchase           9,554               57.2527
Purchase           2,491               59.01
Purchase           362                 56.92
Purchase           314                 57.1907
Purchase           1,460               57.1907
Sale               62                  57.0008
Sale               131                 57.02
Sale               149                 56.92
Sale               204                 57.04
Sale               214                 57.17
Sale               205                 57.43
Sale               163                 57.38
Sale               17                  56.9324
Sale               30                  Transfer
Sale               187                 57.0132
Sale               176                 56.7916
Sale               177                 57.002
Sale               11                  57.57
Sale               30                  57.34
Sale               4,000               58.4563
Sale               52                  56.96
Sale               44                  57
Sale               53                  57.22
Sale               162                 56.88
Sale               163                 57.254
Sale               175                 56.94
Sale               178                 56.93
Sale               76                  57.452
Sale               206                 57.01
Sale               90                  56.94
Sale               170                 56.95
Sale               163                 57.2
Sale               129                 57.3348
Sale               63                  56.93
Sale               27                  57.48
Sale               161                 56.954
Sale               86                  54.28
Sale               179                 57.2832
Sale               130                 56.7716
Sale               190                 57.01
Sale               205                 57.21
Sale               65                  57.1516
Sale               141                 57.17
Sale               180                 57.2124
Sale               210                 57.02
Sale               210                 56.82
Sale               19,012              57.7503
Sale               63                  57.2416
Sale               54                  57.3408
Sale               14                  57.4224
Sale               134                 56.95
Sale               20                  56.96
Sale               223                 57.29
Sale               30                  57.24
Sale               175                 57.17
Sale               143                 56.9232
Sale               175                 57.2408
Sale               180                 56.8
Sale               142                 56.86
Sale               1,767               57.8504
Sale               167                 56.74
Sale               163                 56.93
Sale               197                 56.9124
Sale               86                  57.04
Sale               44                  56.7324
Sale               208                 57.01
Sale               179                 57.1
Sale               11                  57.25
Sale               146                 57.34
Sale               106                 56.78
Sale               105                 57.02
Sale               151                 56.9824
Sale               196                 57.47
Sale               7                   57.03
Sale               160                 57.31
Sale               5,611               57.4408
Sale               132                 56.86
Sale               3,574               58.5396
Sale               45                  57.13
Sale               2,797               59.01
Sale               150                 56.83
Sale               170                 57.35
Sale               100                 57.25
Sale               125                 57.2732
Sale               75                  57.32
Sale               140                 57.1648
Sale               400                 57.09
Sale               157                 57.1024
Sale               70                  57.43
Sale               90                  56.8408
Sale               147                 57.2732
Sale               164                 56.7824
Sale               112                 57.2524
Sale               267                 56.92
Sale               199                 57.3028
Sale               216                 57.59
Sale               191                 57.18
Sale               45                  57.76
Sale               100                 57.18
Sale               70                  57.0331
Sale               1,524               57.0558
Sale               4,292               58.2
Sale               908                 59.01
Sale               150                 57.0212
Sale               500                 58.4
Sale               250                 57.01
Sale               140                 57.43
Sale               100                 57.43
Sale               60                  57.43
Sale               150                 57.29
Sale               150                 57.26
Sale               100                 57.47
Sale               120                 57.47
Sale               100                 57.41
Sale               364                 57.43
Sale               75                  57.0132
Sale               176                 57.0558
Sale               100                 56.87
Sale               163                 57.25
Sale               100                 57.43
Sale               58                  56.85
Sale               193                 57.03
Sale               68                  57.09
Sale               166                 56.97
Sale               123                 57.1
Sale               180                 57.02
Sale               11                  57.43
Sale               70                  57.22
Sale               212                 57.47
Sale               162                 57.0012
Sale               159                 57.2224
Sale               98                  56.81
Sale               38                  Transfer
Sale               2,433               57.0758
Sale               44                  56.9808
Sale               373                 57.42
Sale               210                 56.86
Sale               179                 56.8608
Sale               163                 57.4332
Sale               211                 56.95
Sale               165                 57.17
Sale               180                 56.852
Sale               218                 56.8
Sale               26                  57.76
Sale               170                 57
Sale               205                 57.46
Sale               44                  57.1508
Sale               14,611              57.8169
Sale               6,457               59.0011
Sale               18                  57.06
Sale               47                  57.0916
Sale               102                 57.34
Sale               87                  57.44
Sale               208                 57
Sale               97                  56.88
Sale               192                 57.3232
Sale               204                 57.52
Sale               205                 57.43
Sale               54                  57.052
Sale               144                 56.79
Sale               161                 56.94
Sale               124                 56.9



(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          2433          57.0757
CFD            Long          151           57.102
CFD            Long          5611          57.4408
CFD            Long          19012         57.7502
CFD            Long          14611         57.8168
CFD            Long          4000          58.4562
CFD            Long          3574          58.5396
CFD            Long          6457          59.0011
CFD            Short         10128         57.2221
CFD            Short         712           57.2313
CFD            Short         9554          57.2527
CFD            Short         62940         57.2879
CFD            Short         2400          57.3252
CFD            Short         96239         58.7173
CFD            Short         23158         58.7582


(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                         09 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   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                    3,800.0000       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   -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