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 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      46,957,242      4.70%       783,413     0.08%
securities
(2) Derivatives    1,037,562      0.10%     1,702,394     0.17%
(other than
options)
(3) Options and      101,200      0.01%       276,980     0.03%
agreements to
purchase/sell
Total             48,096,004      4.82%     2,762,787     0.28%


(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         18,855                27.1581
Purchase         31,412                26.7663
Purchase         4,564                 27.9700
Purchase         17                    Transfer
Purchase         2,282                 27.9700
Purchase         5,817                 27.9700
Purchase         4,986                 27.9700
Purchase         4,824                 27.9700
Purchase         663                   23.9900
Purchase         13,215                23.8125
Purchase         1,444                 26.8004
Purchase         995                   27.0979
Purchase         200                   33.8400 EUR
Purchase         75                    26.8500
Purchase         1,651                 27.3033
Purchase         3,076                 26.7722
Purchase         12,328                24.6277
Purchase         1,192                 26.7722
Purchase         8,200                 26.7119
Purchase         24                    Transfer
Purchase         3,518                 27.7998
Purchase         35                    26.6800
Purchase         838                   26.4715
Purchase         9,079                 27.7998
Purchase         29,800                27.7220
Purchase         33,885                26.7353
Purchase         2,035                 25.5043
Purchase         7,067                 27.9700
Purchase         2,734                 27.7998
Purchase         1,430                 26.1798
Purchase         12,000                27.9700
Purchase         90                    24.2400
Purchase         5,705                 27.9700
Purchase         1,500                 26.3253
Purchase         7,739                 27.6320
Purchase         926                   26.7722
Purchase         1,898                 26.1361
Purchase         2,035                 25.5043
Purchase         18,000                52.0000
Purchase         61                    26.6744
Purchase         18,000                52.0000
Purchase         6,308                 26.1361
Purchase         64,248                24.5968
Purchase         1,723                 27.9700
Purchase         3                     Transfer
Sale             67                    25.4700
Sale             101                   25.4700
Sale             61                    25.4700
Sale             16,907                26.6828
Sale             19,948                26.4310
Sale             795                   25.4700
Sale             72                    25.4700
Sale             22                    25.3100
Sale             1,000                 40.4800 USD
Sale             7,067                 27.9959
Sale             87                    25.4700
Sale             50,070                27.9700
Sale             508                   26.2200
Sale             89                    25.4700
Sale             61                    25.4700
Sale             80                    25.4700
Sale             130                   25.4700
Sale             61                    25.4700
Sale             95                    25.4700
Sale             68                    25.4700
Sale             110                   25.4700
Sale             447                   27.9700
Sale             118                   25.4700
Sale             180                   25.4700
Sale             125                   25.4700
Sale             36,113                26.4942
Sale             90                    25.4700
Sale             2,383                 27.9700
Sale             155,151               26.9257
Sale             38                    26.3000
Sale             200                   24.2800
Sale             4,200                 26.3912
Sale             77,800                27.6211
Sale             1,700                 26.7745
Sale             28                    Transfer
Sale             61                    23.9600
Sale             64                    25.4700
Sale             37                    23.9500
Sale             425                   27.9700
Sale             198                   26.3000
Sale             29                    24.1500
Sale             1,500                 27.9954
Sale             120                   27.5400
Sale             58                    Transfer
Sale             18,000                52.0000
Sale             25                    23.9500
Sale             90                    24.2400
Sale             110                   25.4700
Sale             22,800                26.6523
Sale             125                   25.4700
Sale             28,341                26.7467
Sale             163,182               26.4463
Sale             25                    24.5700
Sale             120                   25.4700
Sale             150                   26.6200
Sale             28                    Transfer
Sale             190                   25.4700
Sale             5,075                 26.7000
Sale             95                    25.4700
Sale             90                    25.4700
Sale             40                    27.0800
Sale             60                    27.0800
Sale             79                    25.4700
Sale             83                    25.4700
Sale             90                    34.7800 EUR
Sale             320,451               24.6892
Sale             390                   Transfer


NB: The below transactions which were previously disclosed have been cancelled
Deal Date   Purchase/Sale   Number of Securities   Price per unit (GBP)
10/10/2008  Sale            602,293                24.7011
10/10/2008  Purchase        110,672                24.6092


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          200           24.28
CFD            Long          320451        24.6892
CFD            Long          4200          26.3912
CFD            Long          19948         26.431
CFD            Long          163182        26.4462
CFD            Long          36113         26.4941
CFD            Long          16907         26.6828
CFD            Long          28341         26.7467
CFD            Long          155151        26.9256
CFD            Long          77800         27.6211
CFD            Long          1500          27.9953
CFD            Short         64248         24.5967
CFD            Short         4070          25.5042
CFD            Short         1500          26.3252
CFD            Short         61            26.6744
CFD            Short         8200          26.7119
CFD            Short         33885         26.7352
CFD            Short         31412         26.7662
CFD            Short         7739          27.632
CFD            Short         29800         27.722


NB: The below transactions which were previously disclosed have been cancelled
Deal Date  Long/Short Number of Securities Price per unit (GBP)
10/10/2008 Short      110,672              24.6092
10/10/2008 Long       602,293              24.7011


(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)
Put             Selling           115000             52        EURO            19/12/2008  0

(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 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   -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   100,000                56.0000          AMER           18/12/2009
Option            Purchased   -115                   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
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


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