<SEC-DOCUMENT>0001144204-11-033661.txt : 20110602
<SEC-HEADER>0001144204-11-033661.hdr.sgml : 20110602
<ACCEPTANCE-DATETIME>20110602112443
ACCESSION NUMBER:		0001144204-11-033661
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20110523
FILED AS OF DATE:		20110602
DATE AS OF CHANGE:		20110602

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

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GLENCORE INTERNATIONAL PLC
		CENTRAL INDEX KEY:			0001521365
		STATE OF INCORPORATION:			Y9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34474
		FILM NUMBER:		11887463

	BUSINESS ADDRESS:	
		STREET 1:		BAARERMATTSTRASSE 3
		STREET 2:		P.O. BOX 777
		CITY:			BAAR
		STATE:			V8
		ZIP:			CH-6341
		BUSINESS PHONE:		41 41 709 2000

	MAIL ADDRESS:	
		STREET 1:		BAARERMATTSTRASSE 3
		STREET 2:		P.O. BOX 777
		CITY:			BAAR
		STATE:			V8
		ZIP:			CH-6341
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>v224759_ex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2011-05-23</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001521365</rptOwnerCik>
            <rptOwnerName>GLENCORE INTERNATIONAL PLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>BAARERMATTSTRASSE 3</rptOwnerStreet1>
            <rptOwnerStreet2>P.O. BOX 777</rptOwnerStreet2>
            <rptOwnerCity>BAAR</rptOwnerCity>
            <rptOwnerState>V8</rptOwnerState>
            <rptOwnerZipCode>CH-6341</rptOwnerZipCode>
            <rptOwnerStateDescription>SWITZERLAND</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>36374058</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Series A Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>8125546</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Cash Settled Total Return Swap (obligation to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>9.7193</value>
                <footnoteId id="F3"/>
                <footnoteId id="F4"/>
                <footnoteId id="F5"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2012-09-17</value>
            </exerciseDate>
            <expirationDate>
                <value>2012-09-17</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4729302</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F7"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Cash Settled Total Return Swap (obligation to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>16.6582</value>
                <footnoteId id="F3"/>
                <footnoteId id="F5"/>
                <footnoteId id="F6"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2013-03-11</value>
            </exerciseDate>
            <expirationDate>
                <value>2013-03-11</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4400000</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F7"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>15.87</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F8"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F8"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>15.17</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F9"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F9"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F9"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>7.34</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F10"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F10"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F10"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>24.10</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F11"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F11"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F11"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>26.70</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F12"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F12"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F12"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>35.90</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F13"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F13"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F13"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>55.06</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F14"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F14"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F14"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The shares of Common Stock reported on Table I and the shares of Series A Convertible Preferred Stock reported on Table II
 are owned directly by Glencore AG, a direct wholly-owned subsidiary of Glencore International AG, and indirectly by
 Glencore International plc, the parent company of Glencore International AG.</footnote>
        <footnote id="F2">Each share of Series A Convertible Preferred Stock is convertible into 100 shares of the Common Stock at the times and under
 the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock.  The Series A
 Convertible Preferred Stock has no expiration date.</footnote>
        <footnote id="F3">On July 2, 2010, Glencore International AG (&quot;Glencore International&quot;) entered into a Master Terms and Conditions for Swap
 Transactions agreement (the &quot;Swap Agreement&quot;) with Citigroup Global Markets Inc. (&quot;Citi&quot;), pursuant to which Glencore
 International and Citi may, from time to time, enter into cash-settled total return swaps (the &quot;Swaps&quot;).</footnote>
        <footnote id="F4">Pursuant to the Swap Agreement, on September 15, 2010, Glencore International received economic exposure pursuant to a Swap
 entered into between Glencore International and Citi under which, upon expiration of a two-year term, (i) Glencore
 International will be obligated to make a cash payment to Citi with respect to any depreciation in the volume weighted
 average price of the 4,729,302 shares of common stock referenced by the Swap (the &quot;Subject Shares&quot;) from the $9.719270 per
 share volume weighted average price calculated during the initial averaging period for the Swap (which ended on the
 transaction date) to the volume weighted average price of the Subject Shares during the final valuation period preceding the
 expiration of the term of the Swap, or (ii) Citi will be obligated to make a cash payment to Glencore International with
 respect to any appreciation in such volume weighted average price based on the above period.</footnote>
        <footnote id="F5">In addition, under the terms of the Swap Agreement, generally, Glencore International will be obligated to post cash
 collateral to Citi and pay to Citi certain fees and commissions and Citi will be obligated to pay to Glencore International
 an amount in cash equal to any dividends that would have been paid by the Company on the Subject Shares.</footnote>
        <footnote id="F6">Pursuant to the Swap Agreement, on March 11, 2011, Glencore International received economic exposure pursuant to a Swap
 entered into between Glencore International and Citi under which, upon expiration of a two year term, (i) Glencore
 International will be obligated to make a cash payment to Citi with respect to any depreciation in the volume weighted
 average price of the 4,400,000 shares of common stock referenced by the Swap (the &quot;Subject Shares&quot;) from the $16.6582 per
 share volume weighted average price calculated during the initial averaging period for the Swap (which ended on the
 transaction date) to the volume weighted average price of the Subject Shares during the final valuation period preceding the
 expiration of the term of the Swap, or (ii) Citi will be obligated to make a cash payment to Glencore International with
 respect to any appreciation in such volume weighted average price based on the above period.</footnote>
        <footnote id="F7">The cash settled total return swap reported in Table II is held directly by Glencore International and may be deemed to be
 beneficially owned indirectly by its parent company, Glencore International plc. The cash settled total return swap does not
 give the reporting person or Glencore International direct or indirect voting, investment or dispositive control over any
 securities of the issuer, and accordingly, Glencore International and Glencore International plc disclaim any beneficial
 ownership in the Subject Shares.</footnote>
        <footnote id="F8">June 28, 2001 grant of stock options to Mr. Willy R. Strothotte, a director of the issuer, who holds such options as nominee
 for Glencore AG. Options vested and became exercisable in four equal installments ending on the first anniversary of the
 date of grant.  The options will expire and cease to be exercisable on the tenth anniversary of the date of grant.</footnote>
        <footnote id="F9">June 25, 2002 grant of stock options to Mr. Willy R. Strothotte, a director of the issuer, who holds such options as nominee
 for Glencore AG. Options vested and became exercisable in four equal installments ending on the first anniversary of the
 date of grant.  The options will expire and cease to be exercisable on the tenth anniversary of the date of grant.</footnote>
        <footnote id="F10">June 25, 2003 grant of stock options to Mr. Willy R. Strothotte, a director of the issuer, who holds such options as nominee
 for Glencore AG. Options vested and became exercisable in four equal installments ending on the first anniversary of the
 date of grant.  The options will expire and cease to be exercisable on the tenth anniversary of the date of grant.</footnote>
        <footnote id="F11">July 19, 2004 grant of stock options to Mr. Willy R. Strothotte, a director of the issuer, who holds such options as nominee
 for Glencore AG. Options vested and became exercisable in four equal installments ending on the first anniversary of the
 date of grant.  The options will expire and cease to be exercisable on the tenth anniversary of the date of grant.</footnote>
        <footnote id="F12">August 11, 2005 grant of stock options to Mr. Willy R. Strothotte, a director of the issuer, who holds such options as
 nominee for Glencore AG. Options vested and became exercisable in four equal installments ending on the first anniversary of
 the date of grant.  The options will expire and cease to be exercisable on the tenth anniversary of the date of grant.</footnote>
        <footnote id="F13">June 12, 2006 grant of stock options to Mr. Willy R. Strothotte, a director of the issuer, who holds such options as nominee
 for Glencore AG. Options vested and became exercisable in four equal installments ending on the first anniversary of the
 date of grant.  The options will expire and cease to be exercisable on the tenth anniversary of the date of grant.</footnote>
        <footnote id="F14">May 24, 2007 grant of stock options to Mr. Willy R. Strothotte, a director of the issuer, who holds such options as nominee
 for Glencore AG. Options vested and became exercisable in four equal installments ending on the first anniversary of the
 date of grant.  The options will expire and cease to be exercisable on the tenth anniversary of the date of grant.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>GLENCORE INTERNATIONAL PLC, By: /s/ Steven Kalmin</signatureName>
        <signatureDate>2011-06-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
