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               30 October 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      47,866,859     4.77%        835,847     0.08%
securities
(2) Derivatives      966,044     0.10%      2,013,747     0.20%
(other than
options)
(3) Options and      101,200     0.01%        276,959     0.03%
agreements to
purchase/sell
Total             48,934,103     4.87%      3,126,553     0.31%


(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         167                   28.6200
Purchase         1,516                 28.2612
Purchase         1,705                 28.8978
Purchase         14,170                27.6600
Purchase         30,503                28.1357
Purchase         435                   27.6600
Purchase         200                   36.0800 EUR
Purchase         1,010                 28.4833
Purchase         14,850                27.6600
Purchase         3,996                 27.6600
Purchase         92                    Transfer
Purchase         13,507                27.9552
Purchase         79,437                27.8715
Purchase         300                   28.0033
Purchase         580                   27.6600
Purchase         3,520                 28.1913
Purchase         114,518               27.9302
Purchase         1,806                 27.6600
Sale             81,193                27.6666
Sale             71                    Transfer
Sale             689                   Transfer
Sale             92                    Transfer
Sale             31,835                28.5714
Sale             14,865                28.3950
Sale             151,000               28.2945
Sale             150                   28.0330
Sale             482                   28.2963
Sale             167                   28.6200
Sale             30,311                27.6873
Sale             230                   Transfer
Sale             247,476               28.4633
Sale             1,539                 28.8224
Sale             25                    Transfer
Sale             102                   Transfer
Sale             167                   28.6200
Sale             5,964                 28.4744
Sale             6,417                 28.4744
Sale             3,012                 28.4744
Sale             2,465                 28.4744
Sale             6,584                 28.4744
Sale             2,518                 28.4744
Sale             13,153                28.4744
Sale             7,951                 28.4744
Sale             2,266                 26.7700
Sale             263                   28.4744
Sale             6,590                 28.4744
Sale             4,060                 28.4744
Sale             5,792                 27.5693
Sale             1,311                 28.4744
Sale             59                    Transfer
Sale             23                    27.9100
Sale             19                    27.9100
Sale             622                   28.1308
Sale             19,511                28.3665
Sale             4,894                 28.5160
Sale             1,636                 28.4744
Sale             545                   28.4744
Sale             3,320                 28.4744
Sale             13,026                28.0327
Sale             781                   29.0369
Sale             300                   28.0033
Sale             7,209                 28.4744

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          6973          26.8316
CFD            Long          5792          27.5692
CFD            Long          81193         27.6665
CFD            Long          30311         27.6872
CFD            Long          18497         27.7674
CFD            Long          300           28.0033
CFD            Long          13026         28.0327
CFD            Long          15773         28.2697
CFD            Long          151000        28.2945
CFD            Long          482           28.2963
CFD            Long          14865         28.395
CFD            Long          247476        28.4632
CFD            Long          13128         28.4908
CFD            Long          24085         28.5091
CFD            Long          31835         28.5714
CFD            Long          167           28.62
CFD            Long          781           29.0368
CFD            Short         79437         27.8715
CFD            Short         114518        27.9301
CFD            Short         13507         27.9551
CFD            Short         300           28.0033
CFD            Short         30503         28.1356
CFD            Short         3520          28.1912
CFD            Short         1010          28.4833

(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                         31 October 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   -50,000                64.0000          AMER           21/11/2008
Option            Purchased   -100,000               64.0000          AMER           21/11/2008
Option            Purchased   -125,000               45.0000          AMER           20/03/2009
Option            Purchased   500                    5,000.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   -94                    5,200.0000       EURO           19/12/2008
Option            Purchased   -145                   5,200.0000       EURO           19/12/2008
Option            Purchased   -270                   6,400.0000       EURO           19/12/2008
Option            Purchased   -300                   4,400.0000       EURO           19/12/2008
Option            Purchased   -300                   4,400.0000       EURO           19/12/2008
Option            Purchased   -350                   5,000.0000       EURO           19/12/2008
Option            Purchased   -500                   7,000.0000       EURO           19/12/2008

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