JOINT FILING AGREEMENT

                                                                       EXHIBIT 1

                             JOINT FILING AGREEMENT

      Each of the undersigned hereby agrees to the joint filing on behalf of
each of them of this Amendment No. 1 to the statement on Schedule 13D (including
any amendments thereto) 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 21st day
of May, 2004.


                                         Glencore AG

                                         By: /s/ Xxxxxxxx Xxxxxxxx
                                             --------------------------------
                                             Name:  Xxxxxxxx Xxxxxxxx
                                             Title: Director

                                         By: /s/ Xxxxxx Xxxxxxx
                                             --------------------------------
                                             Name:  Xxxxxx Xxxxxxx
                                             Title: Officer


                                         Glencore International AG

                                         By: /s/ Xxxxxx X. Xxx
                                             --------------------------------
                                             Name:  Xxxxxx X. Xxx
                                             Title: Director

                                         By: /s/ Xxxx Xxxxxxxxxx
                                             --------------------------------
                                             Name:  Xxxx Xxxxxxxxxx
                                             Title: Director


                                         Glencore Holding AG

                                         By: /s/ Xxxxx X. Xxxxxxxxxx
                                             --------------------------------
                                             Name:  Xxxxx X. Xxxxxxxxxx
                                             Title: Director

                                         By: /s/ Xxxx Xxxxxxxxxx
                                             --------------------------------
                                             Name:  Xxxx Xxxxxxxxxx
                                             Title: Director