EPT Disclosure

1st Sep 2008 11:53

FORM 38.5 (b)

DEALINGS BY CONNECTED EXEMPT PRINCIPAL TRADERS

WITHOUT RECOGNISED INTERMEDIARY STATUS, OR WITH RI STATUS

BUT NOT DEALING IN A CLIENT-SERVING CAPACITY

(Rule 38.5(b) of the Takeover Code)

1. KEY INFORMATION

Name of exempt principal trader Credit Suisse Sydney branch Company dealt in BHP Billiton Limited Class of relevant security to which the dealings being disclosed relate (Note 1) Ordinary Shares Date of dealing 29-08-2008

2. INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE

(a) Interests and short positions (following dealing) in the class of relevant security dealt in (Note 2)

Long Short   Number (%) Number (%) (1) Relevant securities     606,413 0.018 (2) Derivatives (other than options)         (3) Options and agreements to purchase/sell     1,172,000 0.035 Total     1,778,413 0.053

(b) Interests and short positions in relevant securities of the company, other than the class dealt in (Note 2)

Class Of Relevant Security : Ordinary Shares Long Short (1) Relevant Securities     (2) Derivatives (other than options)     (3) Options and agreements to purchasesell     Total

(c) Rights to subscribe (Note 2)

Class of relevant security: Details

3. DEALINGS (Note 3)

(a) Purchases and sales

Purchase/sale Number of securities Price per unit (Note 4) Purchase 10,000 41.40 Purchase 10,000 41.40 Purchase 1,550 41.60 Purchase 87 41.60 Purchase 1,000 41.59 Purchase 11 41.59 Purchase 146 41.59 Purchase 2,206 41.59 Purchase 1,493 41.86 Purchase 1,313 41.86 Purchase 110 41.89 Purchase 4,474 41.90 Purchase 526 41.90 Purchase 16 41.89 Purchase 213 41.89 Purchase 223 41.89 Purchase 28 41.89 Purchase 125 41.89 Purchase 1,000 41.86 Purchase 142 41.86 Purchase 1,052 41.86 Sale -96 41.97 Sale -204 41.97 Sale -780 41.97 Sale -1,945 41.97 Sale -111 41.97 Sale -6,864 41.97

TOTAL BUYS:35,715 TOTAL SELLS:10,000

(b) Derivatives transactions (other than options)

Product name, e.g. CFD Long/short (Note 5) Number of securities (Note 6) Price per unit (Note 4)

(c) Options transactions in respect of existing securities

(i) Writing, selling, purchasing or varying

Product name,e.g. call option Writing, selling, purchasing, varying etc. Number of securities to which the option relates (Note 6) Exercise price Type, e.g. American, European etc. Expiry date Option money paid/received per unit (Note 4) PUT OPTION BUYING 2000 40 AMERICAN Sep 25 2008 1.14 PUT OPTION BUYING 6000 39 AMERICAN Sep 25 2008 0.765 PUT OPTION BUYING 15000 39 AMERICAN Sep 25 2008 0.77 PUT OPTION BUYING 10000 39 AMERICAN Sep 25 2008 0.78 PUT OPTION BUYING 50000 40 AMERICAN Sep 25 2008 0.96 PUT OPTION BUYING 25000 39 AMERICAN Sep 25 2008 0.775 PUT OPTION BUYING 3000 39 AMERICAN Sep 25 2008 0.8 CALL OPTION BUYING 2000 45.5 AMERICAN Sep 25 2008 0.35 CALL OPTION BUYING 12000 45 AMERICAN Sep 25 2008 0.435 CALL OPTION BUYING 4000 45 AMERICAN Sep 25 2008 0.42 CALL OPTION BUYING 15000 46 AMERICAN Sep 25 2008 0.245 CALL OPTION BUYING 4000 46 AMERICAN Sep 25 2008 0.25 CALL OPTION BUYING 1000 46 AMERICAN Sep 25 2008 0.275 CALL OPTION BUYING 2000 46 AMERICAN Sep 25 2008 0.27 CALL OPTION BUYING 4000 46 AMERICAN Sep 25 2008 0.24 CALL OPTION BUYING 9000 44 AMERICAN Sep 25 2008 0.65 CALL OPTION BUYING 1000 44 AMERICAN Sep 25 2008 0.66 CALL OPTION BUYING 1000 44 AMERICAN Sep 25 2008 0.61

(ii) Exercising

Product name, e.g. call option Number of securities Exercise price per unit (Note 4)

(d) Other dealings (including new securities) (Note 3)

Nature of transaction (Note 7) Details Price per unit (if applicable) (Note 4)

4. OTHER INFORMATION

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 38.5(b) attached? (Note 8) yes

Date of disclosure 01-09-2008 Contact name Simon Crawley / Carolyn Collins Telephone number 44 20 7888 0241 Name of offeree/offeror with which connected Rio Tinto Plc Nature of connection (Note 9) ADVISOR

Notes The Notes on Form 38.5(b) can be viewed on the Takeover Panel’s website at www.thetakeoverpanel.org.uk.   Product Description Written/Purchased No. of Securities Exercise Price Type Expiry Date Call Option PURCHASED 200,000 32.00 American Jan 29 2009 Call Option PURCHASED 100,000 37.00 American Sep 25 2008 Call Option PURCHASED 25,000 38.00 American Oct 30 2008 Call Option PURCHASED 28,000 40.00 American Sep 25 2008 Call Option PURCHASED 9,000 41.00 American Sep 25 2008 Call Option PURCHASED 44,000 42.00 American Sep 25 2008 Call Option PURCHASED 31,000 43.00 American Sep 25 2008 Call Option PURCHASED 10,000 43.00 American Oct 30 2008 Call Option PURCHASED 200,000 44.00 American Mar 25 2010 Call Option PURCHASED 11,000 45.00 American Sep 25 2008 Call Option PURCHASED 13,000 46.00 American Sep 25 2008 Call Option PURCHASED 15,000 46.00 American Oct 30 2008 Call Option PURCHASED 54,000 47.00 American Sep 25 2008 Call Option PURCHASED 7,000 47.00 American Oct 30 2008 Call Option PURCHASED 2,000 48.00 American Oct 30 2008 Call Option PURCHASED 50,000 50.00 American Dec 18 2008 Call Option PURCHASED 25,000 55.00 American Jun 25 2009 Call Option PURCHASED 50,000 56.00 American Sep 25 2008 Call Option PURCHASED 10,000 60.00 American Jan 29 2009 Call Option PURCHASED 7,000 42.50 American Sep 25 2008 Call Option PURCHASED 22,000 49.00 American Oct 30 2008 Call Option PURCHASED 10,000 52.00 American Sep 25 2008 Call Option PURCHASED 50,000 57.00 American Sep 25 2008 Call Option PURCHASED 18,000 58.00 American Dec 18 2008 Call Option WRITTEN 1,248,000 0.01 American Dec 18 2008 Call Option WRITTEN 55,000 39.00 American Dec 18 2008 Call Option WRITTEN 3,000 39.00 American Sep 25 2008 Call Option WRITTEN 184,000 44.00 American Sep 25 2008 Call Option WRITTEN 14,000 44.00 American Oct 30 2008 Call Option WRITTEN 170,000 46.00 American Dec 18 2008 Call Option WRITTEN 300,000 50.00 American Jun 25 2009 Call Option WRITTEN 52,000 50.00 American Mar 25 2010 Put Option PURCHASED 1,000 30.00 American Sep 25 2008 Put Option PURCHASED 250,000 32.00 American Sep 25 2008 Put Option PURCHASED 2,000 34.00 American Sep 25 2008 Put Option PURCHASED 5,000 34.00 American Oct 30 2008 Put Option PURCHASED 1,000 34.00 American Nov 27 2008 Put Option PURCHASED 75,000 35.00 American Dec 18 2008 Put Option PURCHASED 34,000 38.00 American Sep 25 2008 Put Option PURCHASED 9,000 39.00 American Sep 25 2008 Put Option PURCHASED 2,000 39.00 American Oct 30 2008 Put Option PURCHASED 50,000 50.00 American Jun 25 2009 Put Option PURCHASED 100,000 50.00 American Mar 26 2009 Put Option WRITTEN 20,000 31.00 American Sep 25 2008 Put Option WRITTEN 100,000 35.00 American Sep 25 2008 Put Option WRITTEN 150,000 37.00 American Sep 25 2008 Put Option WRITTEN 4,000 38.00 American Dec 18 2008 Put Option WRITTEN 22,000 39.00 American Dec 18 2008 Put Option WRITTEN 97,000 40.00 American Sep 25 2008 Put Option WRITTEN 50,000 41.00 American Sep 25 2008 Put Option WRITTEN 5,000 43.00 American Sep 25 2008 Call Option PURCHASED 5,000 134.00 American Sep 25 2008

ENDEMMILFEIALILIIT

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