<SEC-DOCUMENT>0001127602-13-011756.txt : 20130321
<SEC-HEADER>0001127602-13-011756.hdr.sgml : 20130321
<ACCEPTANCE-DATETIME>20130321203015
ACCESSION NUMBER:		0001127602-13-011756
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20130319
FILED AS OF DATE:		20130321
DATE AS OF CHANGE:		20130321

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Kjos David
		CENTRAL INDEX KEY:			0001402774

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34474
		FILM NUMBER:		13708954

	MAIL ADDRESS:	
		STREET 1:		C/O CENTURY ALUMINUM COMPANY
		STREET 2:		2511 GARDEN ROAD, BLDG A, SUITE 200
		CITY:			MONTEREY
		STATE:			CA
		ZIP:			93940

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CENTURY ALUMINUM CO
		CENTRAL INDEX KEY:			0000949157
		STANDARD INDUSTRIAL CLASSIFICATION:	PRIMARY PRODUCTION OF ALUMINUM [3334]
		IRS NUMBER:				133070826
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2511 GARDEN ROAD
		STREET 2:		BUILDING A SUITE 200
		CITY:			MONTEREY
		STATE:			CA
		ZIP:			93940
		BUSINESS PHONE:		3042736000

	MAIL ADDRESS:	
		STREET 1:		2511 GARDEN ROAD
		STREET 2:		BUILDING A SUITE 200
		CITY:			MONTEREY
		STATE:			CA
		ZIP:			93940
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2013-03-19</periodOfReport>

    <issuer>
        <issuerCik>0000949157</issuerCik>
        <issuerName>CENTURY ALUMINUM CO</issuerName>
        <issuerTradingSymbol>CENX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001402774</rptOwnerCik>
            <rptOwnerName>Kjos David</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>CENTURY ALUMINUM COMPANY</rptOwnerStreet1>
            <rptOwnerStreet2>2511 GARDEN ROAD, BLDG A, SUITE 200</rptOwnerStreet2>
            <rptOwnerCity>MONTEREY</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>93940</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>VP Maj Proj. Tech. &amp; Sustain</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2013-03-19</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5523</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>148311</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2013-03-19</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>6412</value>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>154723</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>868.7973</value>
                    <footnoteId id="F5"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By 401(k) plan</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of common stock acquired by the Reporting Person upon the vesting of performance share units granted pursuant to the Issuer's 2012-2014 Performance Share Program (&quot;2012-2014 Plan Period &quot;) under a Rule 16b-3(d) plan, all of which vest in the ordinary course on the last day of the 2012-2014 Plan Period, December 31, 2014.</footnote>
        <footnote id="F2">Includes vested performance share units granted to the Reporting Person pursuant to the Issuer's 2011-2013 and 2011-2014 Performance Share Programs, 3,801 of which will settle on December 31, 2013, and 3,500 of which will settle on each of March 22, 2013 and March 22, 2014, respectively; and unvested performance share units granted to the Reporting Person pursuant to the Issuer's 2012-2014 Performance Share Program, all of which will vest on December 31, 2014, all under a Rule 16b-3(d) plan.</footnote>
        <footnote id="F3">Represents shares of common stock acquired by the Reporting Person upon the vesting of performance share units granted pursuant to the Issuer's 2013-2015 Performance Share Program (&quot;Plan Period &quot;) under a Rule 16b-3(d) plan, all of which vest in the ordinary course on the last day of the Plan Period, December 31, 2015.</footnote>
        <footnote id="F4">Includes vested performance share units granted to the Reporting Person pursuant to the Issuer's 2011-2013 and 2011-2014 Performance Share Programs, 3,801 of which will settle on December 31, 2013, and 3,500 of which will settle on each of March 22, 2013 and March 22, 2014, respectively; and unvested performance share units granted to the Reporting Person pursuant to the Issuer's 2012-2014 and 2013-2015 Performance Share Programs, all of which will vest on December 31, 2014 and December 31, 2015, respectively, all under a Rule 16b-3(d) plan.</footnote>
        <footnote id="F5">As reported by 401(k) plan trustee on March 19, 2013.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Michael A. Serafini, Attorney-in-Fact for David Kjos</signatureName>
        <signatureDate>2013-03-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>doc1.txt
<DESCRIPTION>POWER OF ATTORNEY (PUBLIC): POWER OF ATTORNEY
<TEXT>
			POWER OF ATTORNEY


	KNOW ALL BY THESE PRESENTS, that the undersigned hereby
constitutes and appoints each of Jesse E. Gary and Michael A.
Serafini, signing singly, the undersigned's true and lawful
attorney-in-fact to:

	(1)	execute for and on behalf of the undersigned,
		in the undersigned's capacity as an officer and/or
		director of Century Aluminum Company (the
		?Company?), all filings in accordance with the
		Securities Exchange Act of 1934 and the rules
		thereunder;

	(2)	do and perform any and all acts for and on behalf
		of the undersigned which may be necessary or
		desirable to complete and execute any such filings
		in accordance with the Securities Exchange Act of
		1934 and the rules thereunder, complete and execute
		any amendment or amendments thereto, and timely
		file such filings with the United States Securities
		and Exchange Commission and any stock exchange or
		similar authority; and

	(3)	take any other action of any type whatsoever in
		connection with the foregoing which, in the opinion
		of such attorney-in-fact, may be of benefit to, in
		the best interest of, or legally required by, the
		undersigned, it being understood that the documents
		executed by such attorney-in-fact on behalf of the
		undersigned pursuant to this Power of Attorney
		shall be in such form and shall contain such terms
		and conditions as such attorney-in-fact may approve
		in such attorney-in-fact's discretion.


	The undersigned hereby grants to each such attorney-in-fact
full power and authority to do and perform any and every act and thing
whatsoever requisite, necessary, or proper to be done in the exercise
of any of the rights and powers herein granted, as fully to all
intents and purposes as the undersigned might or could do if personally
present, with full power of substitution or revocation, hereby
ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or
cause to be done by virtue of this power of attorney and the rights and
powers herein granted.  The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with the Securities Exchange
Act of 1934.


	This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to execute such filings in
accordance with the Securities Exchange Act of 1934 and the rules
thereunder, unless earlier revoked by the undersigned in a signed
writing delivered to the foregoing attorneys-in-fact.


	IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 11th day of March, 2013.


/s/ David J. Kjos
Signature



David J. Kjos
Print Name
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
