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 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      47,086,809       4.72%      600,264      0.06%
securities
(2) Derivatives      857,430       0.09%    1,734,176      0.17%
(other than
options)
(3) Options and      101,200       0.01%      276,998      0.03%
agreements to
purchase/sell
Total             48,045,439       4.81%    2,611,438      0.26%


(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         2,053                 28.7061
Purchase         500                   29.7100
Purchase         22,687                29.5308
Purchase         5,500                 30.2160
Purchase         109,935               29.9856
Purchase         5,891                 29.8931
Purchase         38,800                28.8800
Purchase         220                   29.8800
Purchase         579                   29.3559
Purchase         200                   29.2800
Purchase         66                    29.7300
Purchase         67,950                29.7651
Purchase         331                   Transfer
Purchase         924                   Transfer
Purchase         19,283                29.6195
Purchase         32,000                28.9375
Purchase         13,000                44.0000
Purchase         8,106                 29.6443
Purchase         659                   29.1544
Purchase         50                    30.3500
Purchase         41,232                29.1700
Purchase         547                   34.7000
Purchase         4,129                 34.7000
Purchase         850                   29.1700
Purchase         425                   29.1700
Purchase         1,222                 Transfer
Purchase         1,208                 29.7632
Purchase         280                   29.7200
Purchase         21,215                29.2725
Purchase         178                   29.1700
Purchase         2,139                 30.2100
Purchase         424                   29.7632
Purchase         560                   29.7632
Purchase         46,081                29.5311
Purchase         1,235                 Transfer
Purchase         2,000                 30.4546
Purchase         902                   29.1700
Purchase         21,124                29.8319
Purchase         3,132                 29.1700
Sale             54                    29.7500
Sale             32,000                28.9375
Sale             400                   30.5154
Sale             32,000                28.9375
Sale             22,471                29.6389
Sale             500                   29.7100
Sale             40                    Transfer
Sale             10,000                29.1700
Sale             84,002                29.9241
Sale             5,300                 30.5370
Sale             1,410                 29.8183
Sale             178                   29.1700
Sale             948                   29.3066
Sale             929                   29.1700
Sale             50                    38.1000 EUR
Sale             55                    38.9000 EUR
Sale             300                   29.8450
Sale             3,308                 29.1700
Sale             319                   29.8800
Sale             13,352                29.1700
Sale             33,380                29.1700
Sale             65                    Transfer
Sale             10,171                29.1700
Sale             68,188                29.7267
Sale             300                   29.4000
Sale             24                    Transfer
Sale             4,500                 29.9315
Sale             47,359                28.8800
Sale             170                   30.4100
Sale             13,000                44.0000
Sale             27,920                29.5120
Sale             30                    30.3700
Sale             12,900                29.6788
Sale             124                   29.5400
Sale             1,485                 29.1700

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          32000         28.9375
CFD            Long          27920         29.512
CFD            Long          22471         29.6389
CFD            Long          12900         29.6788
CFD            Long          500           29.71
CFD            Long          68188         29.7267
CFD            Long          1410          29.8182
CFD            Long          12884         29.873
CFD            Long          84002         29.9241
CFD            Long          4500          29.9314
CFD            Long          400           30.5154
CFD            Long          5300          30.537
CFD            Short         2053          28.706
CFD            Short         38800         28.88
CFD            Short         659           29.1543
CFD            Short         2955          29.17
CFD            Short         579           29.3558
CFD            Short         22687         29.5308
CFD            Short         46081         29.531
CFD            Short         19283         29.6195
CFD            Short         8106          29.6443
CFD            Short         500           29.71
CFD            Short         67950         29.765
CFD            Short         21124         29.8319
CFD            Short         5891          29.8931
CFD            Short         109935        29.9855
CFD            Short         5500          30.216
CFD            Short         2000          30.4545

(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                         08 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   -133                   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