EXHIBIT 5.1

               CURTIS, MALLET-PREVOST, COLT & MOSLE LLP LETTERHEAD



                                  February 15, 2005



Century Aluminum Company
2511 Garden Road, Suite 200
Monterey, CA 93940


Ladies and Gentlemen:

         We have acted as special counsel to Century Aluminum Company, a
Delaware corporation (the "Company"), and Berkeley Aluminum, Inc., Century
Aluminum Holdings, Inc., Century Aluminum of West Virginia, Inc., Century
Kentucky, Inc., Century Louisiana, Inc. and Skyliner, Inc., each a Delaware
corporation, Hancock Aluminum LLC and Virgin Islands Alumina Corporation LLC,
each a Delaware limited liability company, Metalsco, Ltd., a Georgia
corporation, and NSA, Ltd., a Kentucky limited partnership (each individually
referred to as a "Guarantor" and collectively as the "Guarantors") in connection
with the preparation of a Registration Statement on Form S-1 (Registration
Statement No. 333-121255; as amended, the "Registration Statement") filed with
the Securities and Exchange Commission (the "Commission") under the Securities
Act of 1933, as amended (the "Act"), relating to the Company's $175,000,000
aggregate principal amount of 1.75% Convertible Senior Notes due August 1, 2024
(the "Notes") and shares of the Company's Common Stock, $.01 par value (the
"Common Stock") issuable upon conversion of the Notes. The Notes are guaranteed
(each, a "Guarantee") on a joint and several basis by the Guarantors.

         In connection herewith, we have examined and relied upon the Restated
Certificate of Incorporation, the Amended and Restated By-Laws and minute books
of the Company, the Indenture, dated as of August 9, 2004 (as amended and
supplemented, the "Indenture") among the Company, the Guarantors and Wilmington
Trust Company, as trustee (the "Trustee"), and such other documents,
certificates and records as we have deemed necessary or appropriate as a basis
for the opinions set forth herein.

         In rendering this opinion, we have assumed, without any independent
investigation or verification of any kind, the genuineness of all signatures,
the authenticity of all documents submitted to us as originals and the
conformity to authentic original documents of all documents submitted to us as
certified, conformed, photostatic or facsimile copies. We also have assumed that
the Indenture has been duly authorized, executed and delivered by the Trustee
and by any of the Guarantors that is not organized under the laws of Delaware.

Century Aluminum Company
February 15, 2005
Page 2


         Based upon the foregoing and subject to the limitations, qualifications
and exceptions set forth therein, it is our opinion that:

1.       The Notes constitute legal, valid and binding obligations of the
         Company entitled to the benefits of the Indenture, and each Guarantee
         constitutes a legal, valid and binding obligation of the respective
         Guarantor entitled to the benefits of the Indenture, in each case
         subject, as to enforcement of remedies, to applicable bankruptcy,
         reorganization, insolvency (including, without limitation, all laws
         relating to preferences and fraudulent transfers), moratorium and
         similar laws affecting creditors' rights generally and to general
         principles of equity (including, without limitation, concepts of
         materiality, reasonableness, good faith and fair dealing), whether
         enforcement is considered in a proceeding in equity or at law, to the
         discretion of the court before which any proceeding therefor may be
         brought, to the extent that rights to indemnity may be limited by
         United States federal or state securities laws or the public policy
         underlying such laws, and to the extent that any waiver of rights or
         defenses contained in the Indenture or the Notes may be limited by
         applicable law and public policy considerations.

2.       The shares of Common Stock initially issuable upon conversion of the
         Notes have been duly authorized and, when issued and delivered in
         accordance with the provisions of the Notes and the Indenture, will be
         validly issued, fully paid and non-assessable.

         This opinion is limited to questions arising under the laws of the
State of New York, the General Corporation Law of the State of Delaware and the
Delaware Limited Liability Company Act, including applicable provisions of the
Delaware Constitution and the reported judicial decisions interpreting those
laws, and the federal laws of the United States of America, and we express no
opinion as to the laws of any other jurisdiction.

         We hereby consent to the reference to our name in the Registration
Statement and in the related Prospectus under the caption "Legal Matters" and to
the use of the foregoing opinion as an exhibit to the Registration Statement. In
giving this consent, we do not hereby admit that we are within the category of
persons whose consent is required under Section 7 of the Act, or the rules and
regulations of the Commission thereunder.


                                   Very truly yours

                                   /s/ Curtis, Mallet-Prevost, Colt & Mosle LLP
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