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               20 March 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      46,379,877      4.65%     1,975,057      0.20%
securities
(2) Derivatives    2,762,101      0.28%       158,122      0.02%
(other than
options)
(3) Options and      141,450      0.01%       100,560      0.01%
agreements to
purchase/sell
Total             49,283,428      4.94%      2,233,739     0.22%



(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      1,100                 48.0000
Purchase      93,364                49.1250
Purchase      12,737                48.1089
Purchase      6,000                 52.7300
Purchase      18,900                48.7846
Purchase      150                   48.2800
Purchase      100                   48.6200
Purchase      1,762                 Transfer
Purchase      100                   48.4392
Purchase      130,221               49.1800
Purchase      23,028                48.1103
Purchase      190                   48.0000
Purchase      40,000                49.1530
Purchase      53                    48.0000
Purchase      17,375                48.1625
Purchase      10,682                52.7037
Purchase      400                   48.1472
Purchase      1,341                 .5144
Purchase      21,368                53.1800
Purchase      447                   47.9443
Purchase      154                   Transfer
Purchase      616                   48.0000
Purchase      150,031               48.5167
Purchase      40,000                49.1530
Purchase      80,000                52.6400
Purchase      14                    Transfer
Purchase      130                   48.1800
Purchase      774                   48.6588
Purchase      32,200                49.1636
Purchase      538                   48.0000
Purchase      3,000                 48.2475
Purchase      134,109               50.7000
Purchase      36,682                48.0000
Purchase      1,809                 48.0000
Purchase      477                   48.0000
Purchase      15,440                48.0163
Purchase      1,247                 47.5703
Purchase      2,000                 50.0000
Purchase      92,000                48.6384
Purchase      2,345                 48.0041
Sale          75                    49.0900
Sale          122                   48.9300
Sale          1,300                 48.2000
Sale          70                    48.7240
Sale          400                   48.2000
Sale          4,554                 48.9701
Sale          105,733               49.2200
Sale          16                    Transfer
Sale          40                    48.9215
Sale          100                   48.6500
Sale          95                    48.7900
Sale          36,682                48.0000
Sale          95                    49.0920
Sale          1,644                 48.0000
Sale          165                   48.7900
Sale          84                    48.9300
Sale          75                    48.9300
Sale          75                    49.0900
Sale          50                    48.3300
Sale          4,551                 49.0029
Sale          70                    47.9400
Sale          37                    48.9300
Sale          200                   48.0600
Sale          75                    47.9600
Sale          134,109               50.7000
Sale          300                   49.0200
Sale          21,497                48.4331
Sale          130                   48.1200
Sale          86                    Transfer
Sale          115                   49.2400
Sale          75                    49.0900
Sale          150                   49.0900
Sale          80                    48.3000
Sale          1,607                 48.9036
Sale          92,000                49.2200
Sale          100                   49.0900
Sale          36                    Transfer
Sale          100                   48.0116
Sale          9,767                 48.5996
Sale          255                   48.1600
Sale          75                    48.9300
Sale          185                   48.9300
Sale          100                   49.0900
Sale          130                   49.1800
Sale          2,553                 48.0000
Sale          783                   48.3701
Sale          100                   48.7540
Sale          600                   47.9928
Sale          150                   48.4400
Sale          35,033                48.2997
Sale          185                   49.0900
Sale          92,000                48.6384
Sale          100                   48.9300
Sale          65                    48.3900
Sale          35,949                49.2200
Sale          100                   49.2500
Sale          38,064                48.0000
Sale          1,379                 48.0000
Sale          198                   48.2400
Sale          200                   48.1600
Sale          40,000                49.1530
Sale          154                   Transfer
Sale          48                    48.9300
Sale          240                   49.0900
Sale          133                   48.9300
Sale          10,682                52.7037
Sale          38                    48.9300
Sale          75                    48.7900
Sale          1,762                 Transfer
Sale          23,138                48.2700
Sale          60                    48.7100
Sale          50                    48.9300
Sale          265                   48.7800
Sale          131                   49.0900
Sale          32,200                49.1636
Sale          500                   48.4200
Sale          9,948                 48.5600
Sale          90                    49.0900
Sale          3,288                 48.0000
Sale          660                   48.7500


(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Short         1341          0.5143
CFD            Short         1247          47.5702
CFD            Short         447           47.9443
CFD            Short         1100          48
CFD            Short         2345          48.0041
CFD            Short         12737         48.1088
CFD            Short         23028         48.1103
CFD            Short         400           48.1472
CFD            Short         17375         48.1624
CFD            Short         3000          48.2475
CFD            Short         150031        48.5167
CFD            Short         18900         48.7846
CFD            Short         93364         49.125
CFD            Short         40000         49.1529
CFD            Short         80000         52.64
CFD            Long          600           47.9928
CFD            Long          1300          48.2
CFD            Long          23138         48.27
CFD            Long          35033         48.2996
CFD            Long          783           48.3701
CFD            Long          21497         48.433
CFD            Long          9767          48.5995
CFD            Long          92000         48.6384

(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                         25 March 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   20,000                 52.0000          AMER           18/04/2008
Option            Purchased   20,000                 54.0000          AMER           18/04/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   350                    4,600.0000       EURO           19/12/2008
Option            Purchased   250                    3,800.0000       EURO           20/06/2008
Option            Purchased   250                    3,000.0000       EURO           20/06/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   125                    4,400.0000       EURO           20/06/2008
Option            Purchased   -10                    5,200.0000       EURO           19/12/2008
Option            Purchased   -250                   2,500.0000       EURO           20/06/2008
Option            Purchased   -300                   3,800.0000       EURO           20/06/2008
Option            Purchased   -100,000               30.0000          AMER           20/06/2008

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