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 August 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      46,328,323      4.64%       942,741      0.09%
securities
(2) Derivatives      575,233      0.06%     2,045,035      0.20%
(other than
options)
(3) Options and      101,400      0.01%       101,300      0.01%
agreements to
purchase/sell
Total             47,004,956      4.71%     3,089,076      0.31%


(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         80,000                46.7196
Purchase         386                   45.6891
Purchase         2,316                 46.3690
Purchase         32,132                46.4216
Purchase         35,120                46.4933
Purchase         386                   47.3313
Purchase         57,075                46.1840
Purchase         1,535                 46.6702
Purchase         2,255                 46.5531
Purchase         20,500                46.5105
Purchase         5,393                 46.6352
Purchase         1,551                 46.3690
Purchase         12,525                45.3500
Purchase         8,554                 46.4890
Purchase         90                    45.9196
Purchase         2,527                 46.5800
Purchase         609                   46.5800
Purchase         42                    Transfer
Purchase         52,126                46.6040
Purchase         5,258                 46.3690
Purchase         12,525                46.5800
Purchase         1,000                 46.5780
Purchase         12,036                46.3162
Sale             7,751                 46.5514
Sale             12,525                45.3500
Sale             386                   47.3313
Sale             42                    Transfer
Sale             3,700                 Transfer
Sale             528                   Transfer
Sale             900                   46.5490
Sale             15,470                46.6814
Sale             2,600                 46.5561
Sale             2,473                 46.5800
Sale             45                    59.0000 EUR
Sale             221                   46.4100
Sale             250                   46.3684
Sale             175                   46.3142
Sale             130                   46.3124
Sale             300                   45.9900
Sale             800                   45.9431
Sale             33,363                46.5463
Sale             15,000                46.5800
Sale             12,120                46.3755
Sale             12                    46.3684
Sale             2,527                 46.5800
Sale             116,866               46.4811
Sale             76                    Transfer
Sale             1,600                 46.4275
Sale             12,525                46.5800

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          800           45.9431
CFD            Long          300           45.99
CFD            Long          12120         46.3755
CFD            Long          1600          46.4275
CFD            Long          116866        46.4811
CFD            Long          33363         46.5463
CFD            Long          900           46.549
CFD            Long          7751          46.5513
CFD            Long          2600          46.5561
CFD            Long          15470         46.6814
CFD            Short         57075         46.1839
CFD            Short         32132         46.4215
CFD            Short         8554          46.4889
CFD            Short         20500         46.5105
CFD            Short         2255          46.553
CFD            Short         1000          46.578
CFD            Short         52126         46.6039
CFD            Short         5393          46.6351
CFD            Short         1535          46.6702
CFD            Short         80000         46.7195

(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                         14 August 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   -100,000                64.0000         AMER           21/11/2008
Option            Purchased   350                     4,600.0000      EURO           19/12/2008
Option            Purchased   350                     4,600.0000      EURO           19/12/2008
Option            Purchased   300                     5,000.0000      EURO           19/12/2008
Option            Purchased   200                     5,000.0000      EURO           19/09/2008
Option            Purchased   200                     5,000.0000      EURO           19/12/2008
Option            Purchased   -135                    5,200.0000      EURO           19/12/2008
Option            Purchased   -145                    5,200.0000      EURO           19/12/2008
Option            Purchased   -200                    7,000.0000      EURO           19/12/2008
Option            Purchased   -250                    5,200.0000      EURO           19/09/2008
Option            Purchased   -270                    6,400.0000      EURO           19/12/2008
Option            Purchased   -300                    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