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               16 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      45,609,046      4.57%     2,397,407      0.24%
securities
(2) Derivatives    3,215,874      0.32%        24,989      0.00%
(other than
options)
(3) Options and      141,450      0.01%       101,080      0.01%
agreements to
purchase/sell
Total             48,966,370      4.91%     2,523,476      0.25%


(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         21,300                60.0700
Purchase         781                   63.6700
Purchase         2,842                 63.6700
Purchase         27,773                62.4807
Purchase         425                   62.0540
Purchase         4,141                 61.5000
Purchase         16                    59.5270
Purchase         26                    61.5460
Purchase         2,804                 63.6700
Purchase         3,279                 62.0752
Purchase         10,184                63.6700
Purchase         80,000                62.9651
Purchase         167                   63.6700
Purchase         20                    62.7984
Purchase         13,801                61.5000
Purchase         2,221                 62.0752
Purchase         6,114                 61.5000
Purchase         7,401                 62.0752
Sale             50                    62.2060
Sale             50                    62.2060
Sale             75                    62.2060
Sale             154                   63.3216
Sale             50                    62.2060
Sale             150                   62.1100
Sale             75                    62.2060
Sale             83                    63.3500
Sale             75                    62.1800
Sale             970                   62.0445
Sale             80                    62.1460
Sale             42                    63.2345
Sale             35                    Transfer
Sale             300                   62.9030
Sale             55                    62.1100
Sale             115                   62.1500
Sale             200                   62.0930
Sale             70                    61.9824
Sale             530                   63.2545
Sale             50                    63.2890
Sale             50                    62.1100
Sale             52                    62.3300
Sale             150                   62.1100
Sale             50                    63.2032
Sale             40                    62.0533
Sale             13,788                63.6700
Sale             50                    62.1760
Sale             30                    76.9700 EUR
Sale             55                    62.9716
Sale             100                   60.7795
Sale             100                   62.9660
Sale             75                    62.2060
Sale             500                   60.6600
Sale             2,650                 62.4327
Sale             1,300                 60.7592
Sale             83,249                63.1085
Sale             26,575                62.1595
Sale             163,071               62.9446
Sale             25                    77.7000 EUR
Sale             83                    60.5850
Sale             11,000                63.6700
Sale             309                   62.0730
Sale             15,066                61.2711
Sale             144                   62.0720
Sale             25,420                61.6893
Sale             624                   62.4026
Sale             1,220                 63.6700
Sale             200                   61.6600
Sale             5,963                 63.6604
Sale             50                    62.2060
Sale             50                    62.2060
Sale             1,000                 76.2600 EUR
Sale             33                    75.9000 EUR
Sale             30                    59.3300
Sale             27                    Transfer
Sale             2,800                 62.8699
Sale             3,623                 63.6700
Sale             30                    Transfer
Sale             58                    59.1640
Sale             21                    59.2150
Sale             10                    62.8075
Sale             50                    Transfer
Sale             5,970                 62.4173
Sale             445                   62.0130
Sale             19,947                60.0700


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          500           60.66
CFD            Long          1300          60.7591
CFD            Long          15066         61.271
CFD            Long          25420         61.6892
CFD            Long          26575         62.1594
CFD            Long          624           62.4025
CFD            Long          5970          62.4172
CFD            Long          2800          62.8698
CFD            Long          163071        62.9446
CFD            Long          83249         63.1084
CFD            Long          5963          63.6604
CFD            Short         27773         62.4806
CFD            Short         80000         62.965


(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                         17 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