Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:

Kazakhmys PLC

2. Reason for the notification (Yes/No)

An acquisition or disposal of voting rights: (Yes)

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached: (No)

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments: (No)

An event changing the breakdown of voting rights: (No)

Other (please specify):

3. Full name of person(s) subject to the notification obligation:

Joint Stock Company "National Welfare Fund "Samruk-Kazyna"

4. Full name of shareholder(s) (if different from 3.):

As above

5. Date of the transaction and date on which the threshold is crossed or reached:

5 October 2010

6. Date on which issuer notified:

5 October 2010

7. Threshold(s) that is/are crossed or reached:

11%

8. Notified details:

A: Voting rights attached to shares

Class/type of shares (if possible using the ISIN CODE):

GB00B0HZPV38

Situation previous to the triggering transaction

Number of shares: Nil

Number of voting rights: Nil

Resulting situation after the triggering transaction

Number of shares (direct): 58,876,793

Number of voting rights (direct): 58,876,793

Number of voting rights (indirect): Nil

% of voting rights (direct): 11.00%

% of voting rights (indirect): Nil

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument: N/A

Expiration date: N/A

Exercise/conversion period: N/A

Number of voting rights that may be acquired if the instrument is

exercised/converted: N/A

% of voting rights: N/A

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument: N/A

Exercise price: N/A

Expiration date: N/A

Exercise/conversion period: N/A

Number of voting rights instrument refers to: N/A

% of voting rights (nominal): N/A

% of voting rights (delta): N/A

Total (A+B+C)

Number of voting rights: 58,876,793

Percentage of voting rights: 11.00%

9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable:

Joint Stock Company "National Welfare Fund "Samruk-Kazyna", an entity owned and controlled by the Government of Kazakhstan

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will cease to hold:

N/A

12. Date on which proxy holder will cease to hold voting rights:

N/A

13. Additional information:

The State Property & Privatisation Committee of the Ministry of Finance of the Republic of Kazakhstan, an entity owned and controlled by the Government of Kazakhstan, also holds 80,286,050 ordinary shares in Kazakhmys PLC which represents 15% of the total shares in issue.

14. Contact name:

Robert Welch, Company Secretary

15. Contact telephone number:

020 7901 7831