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               07 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      46,973,112      4.71%     1,270,372      0.13%
securities
(2) Derivatives    2,495,620      0.25%        56,213      0.01%
(other than
options)
(3) Options and      146,650      0.01%       100,810      0.01%
agreements to
purchase/sell
Total             49,615,382      4.97%     1,427,395      0.14%


(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      437                   55.9400
Purchase      454                   55.8209
Purchase      2,208                 55.9400
Purchase      250                   56.3000
Purchase      591                   55.8209
Purchase      430                   55.8209
Purchase      265                   55.8209
Purchase      36                    Transfer
Purchase      1,469                 55.8223
Purchase      5,000                 56.3365
Purchase      15,000                55.9400
Purchase      436                   55.8209
Purchase      18,78                 55.7394
Purchase      150                   55.5600
Purchase      2,700                 56.3861
Purchase      395                   56.1094
Purchase      1,948                 55.6796
Purchase      14,671                55.9400
Purchase      8,740                 55.9400
Purchase      200                   55.8209
Sale          20                    73.3500 EUR
Sale          200                   55.5200
Sale          7,942                 56.1706
Sale          1,842                 55.8701
Sale          29                    55.3500
Sale          35                    55.4737
Sale          15,910                55.9400
Sale          115                   56.0136
Sale          4,287                 55.9280
Sale          37                    58.2800
Sale          65                    55.9700
Sale          182                   56.1065
Sale          24,940                56.2440
Sale          45                    55.6000
Sale          1,689                 55.8893
Sale          185                   56.1316
Sale          25                    56.1200
Sale          21,800                56.2333
Sale          17,576                55.9733
Sale          143                   55.5400
Sale          3,819                 55.9316
Sale          27,653                55.9141
Sale          180                   56.1400
Sale          45                    55.5600
Sale          170                   56.0036
Sale          410                   56.1065
Sale          75                    56.1232
Sale          255                   56.3000
Sale          160,529               55.9964
Sale          135                   56.1900
Sale          36                    Transfer
Sale          50                    55.8800
Sale          9,889                 56.2000
Sale          362                   55.8500
Sale          10,188                55.9400
Sale          1,231                 55.9400
Sale          75                    56.1616
Sale          5,890                 56.0250
Sale          75                    56.6100
Sale          100                   55.6300
Sale          75                    55.7020


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         1948          55.6795
CFD            Short         18780         55.7394
CFD            Short         5000          56.3364
CFD            Short         2700          56.386
CFD            Long          1842          55.87
CFD            Long          1689          55.8892
CFD            Long          27653         55.914
CFD            Long          4287          55.9279
CFD            Long          3819          55.9316
CFD            Long          17576         55.9732
CFD            Long          160529        55.9964
CFD            Long          7942          56.1706
CFD            Long          24940         56.244


(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                         10 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                    3,000.0000       EURO           20/06/2008
Option            Purchased   250                    3,800.0000       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                   2,500.0000       EURO           20/06/2008
Option            Purchased   -250                   5,200.0000       EURO           20/03/2008
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