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                                                                    EXHIBIT 3.12



                         CERTIFICATE OF INCORPORATION

                                    OF

                        KAISER JAMAICA CORPORATION


          FIRST. The name of the corporation is KAISER JAMAICA CORPORATION.

          SECOND. Its principal office in the State of Delaware is located at
No. 100 West Tenth Street, in the City of Wilmington, County of New Castle. The
name and address of its resident agent is The Corporation Trust Company, No.
100 West Tenth Street, Wilmington 99, Delaware.

          THIRD. The nature of the business, or objects or purposes to be
transacted, promoted or carried on are:

          (a) To acquire, hold, work and operate on the Island of Jamaica,
     direct or indirect interests in mines, mining rights, leases, claims,
     lodes and concessions, for the mining and treatment of bauxite and
     aluminous ores.

          (b) To, on the Island of Jamaica, mine, refine, store, transport,
     purchase, sell, toll, obtain, transfer, exchange and otherwise turn to
     profit and enhance the value of bauxite and aluminous ores.

          (c) To, directly or indirectly, construct, operate, maintain,
     improve, manage, work, control and superintend, on the Island of Jamaica,
     facilities for drying, calcining, refining, treating, conveying, storing,
     loading, unloading, transporting, converting into alumina and otherwise
     turning to profit bauxite and aluminous ores; facilities for
     manufacturing, storing, using, loading, unloading and transporting all
     chemicals, including caustic soda and



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     chlorine and other products necessary or convenient to any activities
     of the corporation; facilities for the handling, storing, loading,
     unloading, treating, processing and transporting water, petroleum,
     petroleum products, coal or coke; facilities that may be necessary or
     convenient for the production of power, including steam plants; air
     compression facilities; workshops and all other facilities necessary or
     convenient for the manufacture, production and repair of machines, tools,
     dies, jigs and fixtures; and facilities for the storage and transportation
     by any means whatsoever of any of the products used, produced or consumed
     in any of the activities of this corporation.

          (d) To enter into partnerships, general or limited, or joint ventures
     in connection with or to carry out all or any of the foregoing objectives
     and purposes or any other lawful activity and to act as manager, agent or
     representative of any such partnership or joint venture.

          (e) To execute from time to time such general or special powers of
     attorney to such person, persons, partnerships and joint venturers as the
     Board of Directors may approve, granting to the foregoing such powers as
     the Board of Directors may deem proper, and to revoke such powers of
     attorney as and when the Board of Directors may desire.

          (f) Without restriction or limit as to amount, to purchase or
     otherwise acquire, take, own, hold, deal in, mortgage or otherwise lien or
     encumber, and to lease, sell, exchange, transfer, or in any manner
     whatsoever dispose of, real and personal property of every class and
     description, or any interest therein, within or without the State of
     Delaware, wherever situated.



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          (g) To manufacture, purchase, extract, mine, produce, process or
     otherwise acquire, invest in, own, hold, mortgage, pledge, sell, assign
     and transfer or otherwise dispose of, trade, deal in and deal with goods,
     wares and merchandise and property of any and every class and description,
     within or without the State of Delaware, wherever situated.

          (h) To acquire, and pay for in cash, stocks or bonds of the
     corporation or otherwise, the good will, rights, assets and property, and
     to undertake or assume the whole or any part of the obligations or
     liabilities of any person, firm, association or corporation; to hold or in
     any manner to dispose of the whole or any part of the same; to conduct the
     whole or any part of any business so acquired, and to exercise all the
     powers necessary or convenient in and about the conduct and management of
     such business.

          (i) To acquire, hold, use, sell, assign, lease, grant licenses in
     respect of, mortgage or otherwise dispose of letters patent of the United
     States or any foreign country, patent rights, licenses and privileges,
     inventions, improvements and processes, copyrights, trademarks and trade
     names, relating to or useful in connection with any business of this
     corporation.

          (j) To acquire by purchase, subscription or otherwise, and to
     receive, hold, own, guarantee, sell, assign, exchange, transfer, mortgage,
     pledge or otherwise dispose of or deal in and with any of the shares of
     the capital stock, or any voting trust certificates in respect of the
     shares of capital stock, scrip, warrants, rights, bonds, debentures,
     notes, trust receipts and other securities, 



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     obligations, choses in action and evidences of indebtedness or interest
     issued or created by any corporations, joint stock companies, syndicates,
     associations, firms, trusts or persons, public or private, or by the
     Government of the United States of America, or by any foreign government,
     or by any state, territory, province, municipality or other political
     subdivision or by any governmental agency, and as owner thereof to possess
     and exercise all the rights, powers and privileges of ownership, including
     the rights to execute consents and vote thereon, and to do any and all
     acts and things necessary or advisable for the preservation, protection,
     improvement and enhancement in value thereof.

          (k) To enter into, make and perform contracts of every kind and
     description with any person, firm, association, corporation, municipality,
     county, state, body politic or government or colony or dependency thereof.

          (l) To borrow or raise moneys for any of the purposes of the
     corporation and, from time to time, without limit as to amount, to draw,
     make, accept, endorse, execute and issue promissory notes, drafts, bills
     of exchange, warrants, bonds, debentures and other negotiable or
     non-negotiable instruments and evidences of indebtedness, and to secure
     the payment of any thereof and of the interest thereon by mortgage upon or
     pledge, conveyance or assignment in trust of the whole or any part of the
     property of the corporation, whether at the time owned or thereafter
     acquired, and to sell, pledge or otherwise dispose of such bonds or other
     obligations of the corporation for its corporate purposes.

          (m) To loan to any person, firm or corporation any of its surplus
     funds, either with or without security.



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          (n) To purchase, hold, sell and transfer the shares of its own
     capital stock; provided it shall not use its funds or property for the
     purchase of its own shares of capital stock when such use would cause any
     impairment of its capital except as otherwise permitted by law, and
     provided further that shares of its own capital stock belonging to it
     shall not be voted upon directly or indirectly.

          (o) To have one or more offices and to carry on all or any of its
     operations and business in any of the states, districts, territories or
     colonies of the United States, and in any and all foreign countries,
     subject to the laws of such state, district, territory, colony or country.

          (p) In general, to carry on any other business in connection with the
     foregoing, and to have and exercise all the powers conferred by the laws
     of Delaware upon corporations formed under the General Corporation Law of
     the State of Delaware, and to do any and all of the things hereinbefore
     set forth and any and all things necessary or desirable in connection
     therewith, to the same extent as natural persons might or could do.

          The objects and purposes specified in the foregoing clauses shall,
except where otherwise expressed, be in no wise limited or restricted by
reference to, or inference from, the terms of any other clause in this
certificate of incorporation, but the objects and purposes specified in each of
the foregoing clauses of this Article THIRD shall be regarded as independent
objects and purposes.

          FOURTH. The total number of shares of stock which the corporation
shall have authority to issue is three hundred



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thousand (300,000); the par value of each of such shares shall be One Hundred
Dollars ($100.00).

          At all elections of directors of the corporation each holder of
record of stock possessing voting power shall be entitled to as may votes as
shall equal the number of shares of his stock multiplied by the number of
directors to be elected and he may cast all of such votes for a single director
or he may distribute them among the number to be voted for or any two or more
of them as he may see fit, and thus exercise the right of cumulative voting.

          FIFTH. The minimum amount of capital with which the corporation will
commence business is One Thousand Dollars ($1,000.00).

          SIXTH. The names and places of residence of the incorporators are as
follows:

                NAMES                             RESIDENCES
                -----                             ----------
          Robert G. Sproul, Jr.             2701 Claremont Boulevard
                                            Berkeley, CA

          Rex L. Jones, III                 55 El Camino Real
                                            Burlingame, CA

          Edward A. Cutter                  82 Monto Vista Avenue
                                            Atherton, CA

          SEVENTH. The Corporation is to have perpetual existence.

          EIGHTH. The private property of the stockholders shall not be subject
to the payment of corporate debts to any extent whatever.

          NINTH. In furtherance and not in limitation of the powers conferred
by statute, the Board of Directors is expressly authorized:

          (a) To make, alter or appeal the by-laws of the corporation.

          (b) Without the assent of vote of the stockholders, to authorize the
     creation of mortgages upon, or pledges of, 



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     or conveyances or assignments in trust of, any part or all of the
     properties, including contract rights, assets, business or good will of
     the corporation, whether then or thereafter acquired.

          (c) Without the assent or vote of the stockholders, to authorize the
     guaranty by the corporation of securities, evidences of indebtedness and
     obligations of partnerships, joint ventures, corporations, business
     entities and other persons.

          (d) To set apart out of any of the funds of the corporation available
     for dividends reserves for any proper purpose and to abolish any such
     reserve in the manner in which it was created.

          (e) To designate one or more committees, each committee to consist of
     two (2) or more of the directors of the corporation, which, to the extent
     provided in the resolution or in the by-laws of the corporation, shall
     have and may exercise the powers of the Board of Directors in the
     management of the business and affairs of the corporation, and may
     authorize the seal of the corporation to be affixed to all papers which
     may require it. Such committee or committees shall have such name or names
     as may be stated in the by-laws of the corporation or as may be determined
     from time to time by resolution adopted by the Board of Directors.

          (f) In addition to the powers and authority hereinbefore and by the
     laws of the State of Delaware expressly conferred upon the Board of
     Directors, to exercise all such powers and to do all such acts and things
     that may be exercised or done by a corporation subject, nevertheless, to
     the provisions of the laws 



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     of the State of Delaware and of the Certificate of Incorporation and of
     the by-laws of the corporation.

          TENTH. The number of directors of the corporation shall be fixed by
its by-laws and may be altered from time to time by amending the by-laws as
therein provided, but in no case shall the number be less than three. No
director need be stockholder. The election of directors of the corporation need
not be by ballot unless the by-laws so require. Subject to any limitations of
the by-laws then in effect, the members of the Board of Directors shall be
entitled to reasonable fees, salaries or other compensation for their services
and to reimbursement for their expenses as such members. Nothing contained
herein shall preclude any director from serving the corporation in any other
capacity, or from serving any of the stockholders, subsidiaries, affiliated
corporations or partnerships or joint ventures in which the corporation
participates, in any capacity, and receiving compensation therefor.

          ELEVENTH. No transaction or contract of the corporation shall be void
or voidable by reason of the fact that any director or officer or any firm of
which any director or officer is a member or any corporation of which any
director or officer is a stockholder, officer, director or employee is in any
way interested in such transaction or contract. No director or officer shall be
liable to account to the corporation for any profits realized by or from or
through any transaction or contract by reason of the fact that he, or any firm
of which he is a member or any corporation of which he is a stockholder,
officer, director or employee was interested in such transaction or contract.
Nothing herein contained shall create liability in the events above described
or prevent the authorization, ratification or approval of such contracts in any
other 



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manner permitted by law. Any director of the corporation individually, or any
firm or association of which any director may be a member, or any corporation
of which he may be a director, officer or stockholder, may be a party to, or
may be pecuniarily or otherwise interested in, any contract or transaction of
the corporation, provided the fact of such interest shall be disclosed or have
been known to the Board of Directors or such members thereof as shall be
present at any meeting of the Board of Directors at which action upon any such
contract or transaction shall be taken. Any director of the corporation who is
such a party, or who is a member of such firm or association or a director,
officer or stockholder of such corporation or is so interested, may be counted
in determining the existence of a quorum at any meeting of the Board of
Directors or of any committee thereof which shall authorize any such contract
or transaction, and may vote thereat to authorize or ratify any such contract
or transaction, with like force and effect as if he were not such party or such
member of such firm or association or not such director, officer or stockholder
of such other corporation or not so interested. Any director of the corporation
may vote upon any contract or other transaction between the corporation and any
subsidiary or affiliated corporation without regard to the fact that he is also
a director, officer or stockholder of such subsidiary or affiliated
corporation.

          TWELFTH. No contract or other transaction between the corporation and
any of or all of its stockholders shall, in the absence of fraud, in any way be
invalidated or otherwise affected by the fact that such stockholders are
pecuniarily or otherwise interested in such contract or other transaction.




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          FOURTEENTH. Whenever a compromise or arrangement is proposed between
this corporation and its creditors or any class of them and/or between this
corporation and its stockholders or any class of them, any court of equitable
jurisdiction within the State of Delaware may, on the application in a summary
way of this corporation or of any stockholder or creditor thereof, or on the
application of any receiver or receivers appointed for this corporation under
the provisions of Section 291 of Title 8 of the Delaware Code or on the
application of trustees in dissolution or of any receiver or receivers
appointed for this corporation under the provisions of Section 279 of Title 8
of the Delaware Code order a meeting of the creditors or class of creditors,
and/or 

          THIRTEENTH. Any contract, transaction or act of the corporation, or
of the Board of Directors, or of any committee of the Board of Directors, which
shall be ratified by a majority of the quorum of the stockholders of the
corporation entitled to vote at any annual meeting or at any special meeting
called for such purpose, shall, insofar as permitted by law or by the
Certificate of Incorporation, be as valid and as binding as though ratified by
every such stockholder; provided, however, that any failure of the stockholders
to approve or ratify any such contract, transaction or act, when and if
submitted, shall not be deemed in any way to invalidate the same or deprive the
corporation, its directors, officers or employees of its or their right to
proceed with such contract, transaction or act.


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of the stockholders or class of stockholders of this corporation, as the case
may be, to be summoned in such manner as the said court directs. If a majority
in number representing three-fourths in value of the creditors or class of
creditors, and/or of the stockholders or class of stockholders of this
corporation, as the case may be, agree to any compromise or arrangement and to
any reorganization of this corporation as consequence of such compromise or
arrangement, the said compromise or arrangement and the said reorganization
shall, if sanctioned by the court to which the said application has been made,
be binding on all the creditors or class of creditors, and/or on all
stockholders or class of stockholders, of this corporation, as the case may be,
and also on this corporation

          FIFTEENTH. The stockholders and the Board of Directors shall have
power, if the by-laws so provide, to hold their respective meetings outside of
the State of Delaware. Except as otherwise required by law, the corporate
books, records, documents and papers of the corporation may be kept outside of
the State of Delaware at such place or places as may be designated from time to
time by the Board of Directors or in the by-laws of the corporation.

          SIXTEENTH. Whenever the vote of the stockholders at a meeting thereof
is required or permitted to be taken in connection with any corporate action,
the meeting and vote of stockholders may be dispensed with, if all of the
stockholders who would have been entitled to vote upon the action if such
meeting were held shall consent in writing to such corporate action being
taken.

          SEVENTEENTH. The corporation reserves the right from time to time to
amend, alter, change, add to or repeal any provisions contained in this
Certificate of Incorporation now or hereafter prescribed by law and all rights
and powers at any time conferred upon stockholders, directors and officers of
the corporation by this Certificate of Incorporation 



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or any amendment thereof
or subject to the provisions of this Article SEVENTEENTH.

          IN WITNESS WHEREOF, we, the undersigned, being each of the
incorporators hereinbefore named, for the purpose of forming a corporation
pursuant to the General Corporation Laws of the State of Delaware, do make this
Certificate, hereby declaring and certifying that the facts herein stated are
true, and accordingly have hereunto set our hands and seals this 16th day of
June, 1966.
                                 /s/ ROBERT G. SPROUL, JR.
                                 ---------------------------------------- (L.S.)
                                 Robert G. Sproul, Jr.

                                 /s/ REX L. JONES, III
                                 ---------------------------------------- (L.S.)
                                 Rex L. Jones, III

                                 /s/ EDWARD A. CUTTER
                                 ---------------------------------------- (L.S.)
                                 Edward A. Cutter


STATE OF CALIFORNIA              )
                                 )  ss.
CITY AND COUNTY OF SAN FRANCISCO )

         BE IT REMEMBERED that on this 16th day of June, 1966,
personally came before me, a Notary Public for the State of California,
ROBERT G. SPROUL, JR., REX L. JONES, III and EDWARD A.
CUTTER, all of the parties to the foregoing Certificate of Incorporation,
known to me personally to be such, and severally acknowledged the said
Certificate to be the act and deed of the signers respectively and that the
acts therein stated are truly set forth.

         GIVEN under my hand and seal of office the day and year aforesaid.

                                 /s/ HARRIET RILEY
                                 -------------------------------------
                                            Notary Public
                                 in and for the City and County of
                                 San Francisco, State of California

                                 My commission expires [Illegible]
                                                      ----------------




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                              STATE OF DELEWARE


                         OFFICE OF SECRETARY OF STATE


J. Elisha C. Dukes, Secretary of State of the State of Delaware, do hereby
certify that the above and foregoing is a true and correct copy of 


Certificate of Incorporation of the "KAISER JAMAICA CORPORATION", as received
and filed in this office the twentieth day of June, A.D. 1966, at 10 o'clock
A.M.








              In Testimonny Whereof, I have hereunto set my hand and offical
              seal at Dover this twentieth day of June in the year of our Lord
              on thousand nine hundred and sixty-six



                                             /s/ ELISHA C. DUKES
                                           ------------------------------------
                                                             Secretary of State

[Seal]
                                             [ILLEGIBLE]
                                           ------------------------------------
                                                       Ass't Secretary of State



REC'D FOR RECORD JUNE 20, 1966          LEO J. DUGAN, Jr, RECORDER