1
                                                                    EXHIBIT 3.10



                             ANACONDA JAMAICA INC.


                            CERTIFICATE OF AMENDMENT

                                       OF

                          CERTIFICATE OF INCORPORATION


     ANACONDA JAMAICA INC., a corporation organized and existing under the laws
of the State of Delaware, by its President and Secretary, hereby certifies as
follows:

     FIRST: That the Board of Directors of said ANACONDA JAMAICA INC., by
unanimous written consent given in accordance with the provisions of Section
141(f) of the General Corporation Law of the State of Delaware, adopted
resolutions proposing and declaring advisable the following amendment to the
Certificate of Incorporation of said corporation:

          By revising Article FIRST thereof so that as amended and revised said
     Article FIRST shall read as follows:

          "FIRST: The name of this corporation (hereinafter called the
     'Corporation') is ALPART JAMAICA INC."

     SECOND: That said amendment has been consented to and authorized by the
holders of all of the issued and outstanding stock of ANACONDA JAMAICA INC.,
entitled to vote, by a written consent given in accordance with the provisions
of Section 228 of the General Corporation Law of the State of Delaware.

     THIRD: That said amendment was duly adopted in accordance with the
applicable provisions of Sections 242 and 228 of the General Corporation Law of
the State of Delaware.


   2

     IN WITNESS WHEREOF, this Certificate has been made under the corporate
seal of said ANACONDA JAMAICA INC., and Abram D. Reynolds, its President, and
Donald T. Cowles, its Secretary, have hereunto severally signed their names
this 4th day of October, 1985.

                                   ANACONDA JAMAICA INC.

                                   By /s/ [ILLEGIBLE]
                                     -------------------------------
                                        President

                                   By /s/ [ILLEGIBLE]
                                     -------------------------------
                                        Secretary

STATE OF VIRGINIA )
                  ) ss:
COUNTY OF HENRICO )

     I, the undersigned, a Notary Public in and for the County and State
aforesaid, DO HEREBY CERTIFY, that Donald T. Cowles, personally known to me to
be the Secretary of ANACONDA JAMAICA INC., a Delaware corporation, and
personally known to me to be the same person whose name is subscribed to the
foregoing instrument, appeared before me this day in person and acknowledged
that as such Secretary he signed and delivered the said instrument as Secretary
of said corporation, and caused the corporate seal of said corporation to be
affixed thereto, pursuant to authority given, by the Board of Directors of said
corporation as his free and voluntary act, and as the free and voluntary act
and deed of said corporation, for the uses and purposes therein set forth.

     GIVEN under my hand and official seal, this 10th day of October, 1985.


                                     /s/ CAROL L. DILLON
                                     -------------------------------
                                     Notary Public

                                     My Commission expires: November 2, 1986