JOINT FILING AGREEMENT
EXHIBIT 1
Each of the undersigned hereby agrees to the joint filing on behalf of each of them pursuant
to Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, of this Amendment No. 4 to
the statement on Schedule 13D with respect to the common stock, par value $0.01 per share, of
Century Aluminum Company. This Agreement may be executed in any number of counterparts, all of
which taken together shall constitute one and the same instrument.
IN WITNESS WHEREOF, the undersigned hereby execute this Agreement, this 18th day of July, 2008.
| Glencore Investment Pty Ltd |
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| By: | /s/ Xxxxxxx X. Xxxx | |||
| Name: | Xxxxxxx X. Xxxx | |||
| Title: | Attorney-in-Fact | |||
| Glencore Investments AG |
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| By: | /s/ Xxxxxxx X. Xxxx | |||
| Name: | Xxxxxxx X. Xxxx | |||
| Title: | Attorney-in-Fact | |||
| Glencore International AG |
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| By: | /s/ Xxxxxxx X. Xxxx | |||
| Name: | Xxxxxxx X. Xxxx | |||
| Title: | Attorney-in-Fact | |||
| Glencore Holding AG |
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| By: | /s/ Xxxxxxx X. Xxxx | |||
| Name: | Xxxxxxx X. Xxxx | |||
| Title: | Attorney-in-Fact | |||
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