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               29 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      48,265,232     4.84%        533,265     0.05%
securities
(2) Derivatives      647,856     0.06%      2,108,448     0.21%
(other than
options)
(3) Options and      101,200     0.01%        276,959     0.03%
agreements to
purchase/sell
Total             49,014,288     4.91%      2,918,672     0.29%


(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         26,568                26.7700
Purchase         200                   25.0050
Purchase         66,076                25.1348
Purchase         32,679                25.5615
Purchase         2,800                 25.6424
Purchase         18,602                25.1248
Purchase         46,924                25.7566
Purchase         67                    24.8400
Purchase         24,022                25.1465
Purchase         26,442                24.5970
Purchase         105,334               24.4302
Purchase         1,141                 26.7700
Purchase         10,000                24.4234
Purchase         165                   26.7700
Purchase         1,455                 24.8183
Purchase         14,193                23.3617
Purchase         8,193                 26.7700
Purchase         220                   26.7700
Purchase         149,972               25.2475
Purchase         4,986                 25.3980
Purchase         3,565                 24.4500
Purchase         5,200                 25.9834
Purchase         659                   25.3980
Purchase         46,853                26.7700
Purchase         290                   26.7700
Purchase         5,665                 26.7700
Purchase         1,129                 26.7700
Purchase         3,399                 26.7700
Purchase         1,292                 25.3980
Sale             19,150                25.1216
Sale             7,329                 25.4802
Sale             88,666                26.4711
Sale             164                   25.4649
Sale             3,300                 24.3298
Sale             600                   22.5700
Sale             4,000                 26.7665
Sale             400                   26.7700
Sale             395,879               23.4029
Sale             100                   30.8000 EUR
Sale             17                    33.5000 EUR
Sale             1,400                 26.1300
Sale             500                   25.3000
Sale             32,366                25.5764
Sale             800                   25.5094
Sale             10,000                24.6209
Sale             53,418                26.7237
Sale             49,725                25.5704
Sale             2,900                 24.3298
Sale             23                    23.6640
Sale             800                   Transfer
Sale             46                    23.6410
Sale             200                   25.0050
Sale             4,800                 24.3338

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          11903         24.399
CFD            Long          10000         24.6209
CFD            Long          200           25.005
CFD            Long          19150         25.1216
CFD            Long          9824          25.2926
CFD            Long          164           25.4648
CFD            Long          7329          25.4802
CFD            Long          800           25.5094
CFD            Long          49725         25.5704
CFD            Long          32366         25.5764
CFD            Long          6845          26.407
CFD            Long          88666         26.4711
CFD            Long          53418         26.7237
CFD            Long          4000          26.7665
CFD            Short         10000         24.4233
CFD            Short         105334        24.4302
CFD            Short         26442         24.5969
CFD            Short         200           25.005
CFD            Short         18602         25.1247
CFD            Short         66076         25.1348
CFD            Short         24022         25.1464
CFD            Short         149972        25.2474
CFD            Short         8892          25.4116
CFD            Short         32679         25.5615
CFD            Short         2800          25.6424
CFD            Short         46924         25.7566
CFD            Short         5200          25.9834

(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                         30 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