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               13 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      47,055,741      4.72%     1,021,750      0.10%
securities
(2) Derivatives    2,819,967      0.28%        72,557      0.01%
(other than
options)
(3) Options and      101,450      0.01%       141,080      0.01%
agreements to
purchase/sell
Total             49,977,158      5.01%     1,235,387      0.12%


(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         52,769                65.4110
Purchase         336                   66.4500
Purchase         800                   64.5113
Purchase         346                   65.3750
Purchase         541                   64.4224
Purchase         138                   63.9500
Purchase         1,028                 65.3681
Purchase         19,013                65.9299
Purchase         18,533                66.2088
Purchase         7,268                 66.4500
Purchase         11,600                65.8719
Purchase         590                   64.0418
Purchase         138                   64.0300
Purchase         5,696                 65.9299
Purchase         48,000                64.6225
Purchase         80,000                64.0996
Purchase         22                    Transfer
Purchase         33,022                66.4055
Purchase         8,426                 65.9299
Purchase         3,901                 66.4500
Purchase         144                   64.9000
Purchase         2,364                 65.3658
Purchase         6,510                 65.3665
Purchase         1,439                 65.3688
Purchase         422                   64.4651
Purchase         857                   65.3703
Purchase         2,000                 63.7596
Purchase         3,759                 65.3660
Purchase         141                   64.0900
Purchase         2,185                 65.3660
Purchase         1,874                 65.3673
Purchase         178                   65.3339
Purchase         48,000                64.6225
Purchase         47,530                65.8949
Purchase         74                    Transfer
Purchase         802                   65.3708
Purchase         5,288                 64.0418
Purchase         8,810                 65.3667
Sale             80,000                64.0996
Sale             2,393                 66.2643
Sale             22                    Transfer
Sale             32                    63.5275
Sale             27,375                66.2727
Sale             36                    63.4460
Sale             6,598                 65.0885
Sale             74                    Transfer
Sale             4,000                 66.5138
Sale             174                   64.0594
Sale             75                    63.9920
Sale             37                    Transfer
Sale             40                    65.7745
Sale             110                   64.5745
Sale             90                    64.5746
Sale             30                    63.8620
Sale             40                    64.6200
Sale             40                    64.1100
Sale             80                    66.0045
Sale             100                   66.5720
Sale             100                   64.8660
Sale             55                    63.9556
Sale             150                   64.7790
Sale             200                   64.6030
Sale             138                   64.0300
Sale             200                   65.7820
Sale             80,000                64.0996
Sale             1,600                 64.4700
Sale             200                   64.7020
Sale             25                    64.0632
Sale             63                    Transfer
Sale             44                    Transfer
Sale             48,000                64.6225
Sale             19,098                66.0716
Sale             10,005                66.5051
Sale             19                    64.7805
Sale             556                   64.0294
Sale             35                    65.7524
Sale             38                    64.7775
Sale             65                    66.4725



(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          556           64.0294
CFD            Long          174           64.0594
CFD            Long          80000         64.0996
CFD            Long          6598          65.0884
CFD            Long          893           65.3535
CFD            Long          19098         66.0715
CFD            Long          2393          66.2643
CFD            Long          27375         66.2726
CFD            Long          10005         66.5051
CFD            Short         2000          63.7595
CFD            Short         541           64.4224
CFD            Short         800           64.5112
CFD            Short         48000         64.6225
CFD            Short         52769         65.4109
CFD            Short         11600         65.8719
CFD            Short         47530         65.8949
CFD            Short         18533         66.2088
CFD            Short         33022         66.4055



(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                         14 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                    3,000.0000       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
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