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               10 December 2007

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      47,512,173      4.76%    2,645,958       0.27%
securities
(2) Derivatives    2,467,933      0.25%      146,480       0.01%
(other than
options)
(3) Options and      204,131      0.02%    1,303,531       0.13%
agreements to
purchase/sell
Total             50,184,237      5.03%    4,095,969       0.41%


(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      314                  57.8452
Purchase      57,000               57.9100
Purchase      66,000               58.7000
Purchase      255                  56.6300
Purchase      8,137                57.8518
Purchase      6,969                57.5326
Purchase      9,203                57.8400
Purchase      187                  56.5000
Purchase      3,610                58.3260
Purchase      2,963                57.9373
Purchase      132,325              57.4600
Purchase      7,008                57.8400
Purchase      2,963                57.9530
Purchase      377                  57.8400
Purchase      17,192               58.3360
Purchase      9,683                57.5379
Purchase      3,610                58.3260
Purchase      55,578               55.1500
Purchase      349                  57.4700
Purchase      58,276               57.8182
Purchase      47,366               57.4600
Purchase      37,265               57.5977
Purchase      33,129               58.6034
Purchase      19,535               57.4600
Sale          4,746                57.8400
Sale          101                  Transfer
Sale          19,535               57.4600
Sale          12,251               58.0287
Sale          349                  57.5300
Sale          100                  58.7750
Sale          47,366               57.4600
Sale          273                  57.9600
Sale          1,000                56.3618
Sale          100                  56.9850
Sale          50                   58.5688
Sale          100                  58.1525
Sale          396                  56.5621
Sale          50                   57.1350
Sale          27,000               57.8400
Sale          190                  57.8975
Sale          27,198               58.2613
Sale          45                   58.4050
Sale          50                   56.8688
Sale          349                  57.4700
Sale          3,138                56.8690
Sale          6,969                57.5326
Sale          21,851               57.4395
Sale          58,276               57.8182
Sale          3,610                58.3260
Sale          6,969                57.5326
Sale          2,963                57.9373
Sale          28                   57.0250
Sale          58,276               57.8183
Sale          95                   57.1800
Sale          250                  58.6550
Sale          3,243                57.8400
Sale          162                  57.0100
Sale          105                  57.2475
Sale          1,150                58.2977
Sale          3,815                57.9589
Sale          45,899               57.4537
Sale          132,325              57.4600
Sale          225                  57.9300
Sale          235                  57.1450

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         9683          57.5379
CFD            Short         37265         57.5977
CFD            Short         3610          58.326
CFD            Short         17192         58.336
CFD            Short         33129         58.6033
CFD            Long          1000          56.3618
CFD            Long          45899         57.4537
CFD            Long          6969          57.5326
CFD            Long          2648          57.6366
CFD            Long          273           57.96
CFD            Long          12251         58.0287
CFD            Long          27198         58.2613
CFD            Long          1150          58.2977
CFD            Long          1167          58.6898


(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)
CALL            SALE              150                60        EURO            21/12/2007   1.4
CALL            SALE              150                60        EURO            21/12/2007   1.72


(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                         11 December 2007
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   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   -300,000               52.0000          AMER           15/02/2008
Option            Purchased   -300,000               56.0000          AMER           15/02/2008
Option            Purchased   -100,000               30.0000          AMER           20/06/2008
Option            Purchased   -1,000                 3,500.0000       EURO           21/12/2007
Option            Purchased   -500                   4,400.0000       EURO           21/12/2007
Option            Purchased   -350                   5,200.0000       EURO           21/12/2007
Option            Purchased   -306                   4,200.0000       EURO           21/12/2007
Option            Purchased   -300                   3,800.0000       EURO           20/06/2008
Option            Purchased   -275                   4,800.0000       EURO           21/12/2007
Option            Purchased   -250                   2,500.0000       EURO           20/06/2008
Option            Purchased   -250                   5,200.0000       EURO           20/03/2008
Option            Purchased   50                     5,400.0000       EURO           20/03/2008
Option            Purchased   -600,000               42.0000          AMER           21/12/2007
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   200,000                60.0000          AMER           18/01/2008
Option            Purchased   250                    3,000.0000       EURO           20/06/2008
Option            Purchased   250                    3,300.0000       EURO           21/12/2007
Option            Purchased   250                    3,800.0000       EURO           20/06/2008
Option            Purchased   250                    4,500.0000       EURO           21/12/2007
Option            Purchased   250                    6,000.0000       EURO           15/02/2008
Option            Purchased   250                    6,000.0000       EURO           15/02/2008
Option            Purchased   275                    5,000.0000       EURO           21/12/2007
Option            Purchased   306                    4,800.0000       EURO           21/12/2007
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   450                    3,500.0000       EURO           21/12/2007
Option            Purchased   500                    5,200.0000       EURO           21/12/2007
Option            Purchased   100                    5,600.0000       EURO           18/01/2008



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