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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001127602-10-003614.txt : 20100205
<SEC-HEADER>0001127602-10-003614.hdr.sgml : 20100205
<ACCEPTANCE-DATETIME>20100205162532
ACCESSION NUMBER:		0001127602-10-003614
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100204
FILED AS OF DATE:		20100205
DATE AS OF CHANGE:		20100205

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Crutchfield Kevin S
		CENTRAL INDEX KEY:			0001317675

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32331
		FILM NUMBER:		10577645

	MAIL ADDRESS:	
		STREET 1:		ONE ALPHA PLACE
		STREET 2:		P.O. BOX 2345
		CITY:			ABINGDON
		STATE:			VA
		ZIP:			24212

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Alpha Natural Resources, Inc.
		CENTRAL INDEX KEY:			0001301063
		STANDARD INDUSTRIAL CLASSIFICATION:	BITUMINOUS COAL & LIGNITE SURFACE MINING [1221]
		IRS NUMBER:				421638663
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		ONE ALPHA PLACE
		STREET 2:		P.O. BOX 2345
		CITY:			ABINGDON
		STATE:			VA
		ZIP:			24212
		BUSINESS PHONE:		276-619-4410

	MAIL ADDRESS:	
		STREET 1:		ONE ALPHA PLACE
		STREET 2:		P.O. BOX 2345
		CITY:			ABINGDON
		STATE:			VA
		ZIP:			24212

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Foundation Coal Holdings, Inc.
		DATE OF NAME CHANGE:	20040819
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-02-04</periodOfReport>

    <issuer>
        <issuerCik>0001301063</issuerCik>
        <issuerName>Alpha Natural Resources, Inc.</issuerName>
        <issuerTradingSymbol>ANR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001317675</rptOwnerCik>
            <rptOwnerName>Crutchfield Kevin S</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE ALPHA PLACE</rptOwnerStreet1>
            <rptOwnerStreet2>P.O. BOX 2345</rptOwnerStreet2>
            <rptOwnerCity>ABINGDON</rptOwnerCity>
            <rptOwnerState>VA</rptOwnerState>
            <rptOwnerZipCode>24212</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <officerTitle>Chief Executive Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-02-04</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>39.9698</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>318221</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 7, 2009.</footnote>
        <footnote id="F2">Represents the weighted average sales price for all sales reported in the transaction by reporting person. The actual range of prices for the reported sales in the transaction is $39.95 to $40.00. Upon request, reporting person will provide to the SEC's staff, the Issuer or its shareowners, full information regarding the number of shares sold at each separate price.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Edythe C. Katz, Attorney-in-Fact</signatureName>
        <signatureDate>2010-02-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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