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 March 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      46,608,387      4.67%     1,664,916      0.17%
securities
(2) Derivatives    2,907,474      0.29%       166,006      0.02%
(other than
options)
(3) Options and      146,650      0.01%       100,810      0.01%
agreements to
purchase/sell
Total             49,662,511      4.98%      1,931,732     0.19%


(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      40                    53.1100
Purchase      4,000                 53.1000
Purchase      2,683                 53.1051
Purchase      649                   53.2650
Purchase      209                   54.2100
Purchase      2,193                 53.2527
Purchase      2,209                 53.2444
Purchase      95,253                53.2750
Purchase      28,512                53.6092
Purchase      60                    53.1100
Sale          209                   54.2300
Sale          3,720                 53.0045
Sale          9,032                 53.1319
Sale          40                    53.0200
Sale          3,791                 54.2807
Sale          50                    53.4600
Sale          205                   53.0000
Sale          23                    54.1900
Sale          110                   53.0036
Sale          4,903                 54.3326
Sale          50                    53.0000
Sale          160                   53.1100
Sale          220                   52.8200
Sale          60                    53.1600
Sale          135                   53.0900
Sale          90                    53.1800
Sale          56                    52.8100
Sale          700                   53.2400
Sale          90                    52.9600
Sale          100                   52.7824
Sale          824                   54.1143
Sale          100                   53.0800
Sale          75                    53.7200
Sale          125                   53.6300
Sale          37                    52.9500
Sale          27                    53.5400
Sale          360                   54.0000
Sale          83                    53.8100
Sale          1,077                 52.7208
Sale          88                    52.7500
Sale          41                    53.1100
Sale          75                    53.1924
Sale          30                    53.0400
Sale          300                   54.2743
Sale          120                   52.8820
Sale          180                   53.2100
Sale          650                   53.0800
Sale          20                    52.9800
Sale          4,296                 52.0800
Sale          14,035                53.0280
Sale          209                   54.2100
Sale          80                    52.9300
Sale          170                   52.7348
Sale          125                   53.0000
Sale          77                    54.2808
Sale          100                   52.9800
Sale          100                   53.1400
Sale          500,996               52.9800
Sale          95                    52.9532
Sale          50                    53.1600
Sale          100                   53.4500
Sale          115                   52.9524
Sale          425                   54.0700

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         207           53.0488
CFD            Short         2683          53.1051
CFD            Short         14904         53.1796
CFD            Short         95253         53.275
CFD            Short         28512         53.6092
CFD            Long          500996        52.98
CFD            Long          3720          53.0045
CFD            Long          9032          53.1319
CFD            Long          824           54.1142
CFD            Long          300           54.2743
CFD            Long          4903          54.3325

(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


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.

None


Is a Supplemental Form 8 attached? (Note 9)                 YES


Date of disclosure                         14 March 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   45,000                 54.0000          AMER           20/03/2008
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   150                    4,000.0000       EURO           20/03/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   50                     5,400.0000       EURO           20/03/2008
Option            Purchased   -10                    5,200.0000       EURO           19/12/2008
Option            Purchased   -250                   5,200.0000       EURO           20/03/2008
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