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               14 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      46,873,191      4.70%       671,730     0.07%
securities
(2) Derivatives      917,013      0.09%     1,494,090     0.15%
(other than
options)
(3) Options and      101,200      0.01%       276,980     0.03%
agreements to
purchase/sell
Total             47,891,404      4.80%     2,442,800     0.24%


(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         65                     29.9600
Purchase         112                    35.2900 EUR
Purchase         112                    35.2900 EUR
Purchase         100                    28.9200
Purchase         135                    28.4600
Purchase         145                    30.5900
Purchase         5,222                  28.2309
Purchase         3,338                  28.2600
Purchase         6,847                  28.4996
Purchase         23,366                 28.2600
Purchase         65,729                 28.4390
Purchase         109                    35.2900 EUR
Purchase         176,000                30.6500
Purchase         380                    30.6200
Purchase         400                    30.0300
Purchase         1,488                  28.2600
Purchase         927                    28.1418
Purchase         5,425                  29.6227
Purchase         105                    27.9700
Purchase         5,271                  28.8598
Purchase         18,335                 29.6227
Purchase         82,209                 28.5538
Purchase         7,383                  29.6227
Purchase         3,456                  28.4301
Purchase         6,973                  28.2600
Purchase         12,465                 28.6900
Purchase         62,184                 28.4336
Purchase         62                     29.5500
Purchase         100                    27.8100
Purchase         3,526                  30.1065
Purchase         12,328                 24.6277
Purchase         112                    35.2900 EUR
Purchase         254                    28.3638
Purchase         12,570                 28.2300
Purchase         39                     29.4900
Purchase         204                    28.7700
Purchase         486                    28.7700
Purchase         1,183                  28.7700
Sale             22                     27.5500
Sale             6,973                  27.8725
Sale             15                     29.8100
Sale             29,155                 30.0632
Sale             153                    Transfer
Sale             53,736                 28.6206
Sale             29                     27.6700
Sale             105                    27.9700
Sale             6,404                  28.3764
Sale             117,343                29.3457
Sale             210                    29.6100
Sale             11,308                 30.2212
Sale             294                    Transfer
Sale             90                     29.3400
Sale             215                    26.7500
Sale             9,637                  29.5547
Sale             1,320                  29.4416
Sale             2,760                  29.4416
Sale             229                    29.8800
Sale             112                    35.2900 EUR
Sale             109                    35.2900 EUR
Sale             112                    35.2900 EUR
Sale             112                    35.2900 EUR
Sale             134                    28.2600
Sale             160                    30.6630
Sale             1,400                  30.5100
Sale             5,766                  27.9700
Sale             8,223                  28.3466
Sale             1,240                  29.4416
Sale             22,280                 28.2600
Sale             12,465                 28.6900
Sale             35,654                 28.4833
Sale             1,090                  29.4105
Sale             129,491                29.8290
Sale             43,011                 28.8538
Sale             59,440                 28.4498
Sale             60                     Transfer
Sale             180                    30.7110
Sale             12,570                 28.2300
Sale             100                    27.8100
Sale             27,654                 28.2600

NB: The below transactions which were previously disclosed have been cancelled
Deal Date   Purchase/Sale   Number of Securities   Price per unit (GBP)
13/10/2008  Purchase        2,035                  25.5043


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          100           27.81
CFD            Long          8223          28.3465
CFD            Long          6404          28.3764
CFD            Long          59440         28.4498
CFD            Long          35654         28.4833
CFD            Long          53736         28.6206
CFD            Long          43011         28.8537
CFD            Long          117343        29.3456
CFD            Long          129491        29.8289
CFD            Long          29155         30.0632
CFD            Long          11308         30.2212
CFD            Short         100           27.81
CFD            Short         927           28.1418
CFD            Short         5222          28.2309
CFD            Short         3456          28.4301
CFD            Short         62184         28.4336
CFD            Short         65729         28.4389
CFD            Short         6847          28.4996
CFD            Short         82209         28.5538
CFD            Short         5271          28.8598
CFD            Short         176000        30.65

NB: The below transactions which were previously disclosed have been cancelled
Deal Date  Long/Short Number of Securities Price per unit (GBP)
13/10/2008 Short      2,035                25.5042


(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                         15 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