-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 A+L+tH73XQQOR6YDijy8zgvn/ykkZEOyYZlkjRyaQ28r8viTZ9QhJdzJ6cSL5yJL
 C54c9SAIhH0MaiTQv3Z+5A==

<SEC-DOCUMENT>0001114603-04-000004.txt : 20040622
<SEC-HEADER>0001114603-04-000004.hdr.sgml : 20040622
<ACCEPTANCE-DATETIME>20040622174517
ACCESSION NUMBER:		0001114603-04-000004
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040621
FILED AS OF DATE:		20040622

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BUCHAMER RANDY GLEN
		CENTRAL INDEX KEY:			0001258104

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-32669
		FILM NUMBER:		04875638

	BUSINESS ADDRESS:	
		STREET 1:		2988 BROOKRIDGE DRIVE
		CITY:			NORTH VANCOUVER BC CANADA
		STATE:			A1
		ZIP:			V7R3A8

	MAIL ADDRESS:	
		STREET 1:		2988 BROOKRIDGE DRIVE
		CITY:			NORTH VANCOUVER BC CANADA
		STATE:			A1
		ZIP:			V7R3A8

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			HEARTLAND OIL & GAS CORP
		CENTRAL INDEX KEY:			0001075636
		STANDARD INDUSTRIAL CLASSIFICATION:	BITUMINOUS COAL & LIGNITE SURFACE MINING [1221]
		IRS NUMBER:				911918326
		STATE OF INCORPORATION:			NV
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		SUITE 1500
		STREET 2:		885 WEST GEORGIA STREET
		CITY:			VANCOUVER
		STATE:			A1
		ZIP:			V6C 3E8
		BUSINESS PHONE:		604.693.0177

	MAIL ADDRESS:	
		STREET 1:		SUITE 1500
		STREET 2:		885 WEST GEORGIA STREET
		CITY:			VANCOUVER
		STATE:			A1
		ZIP:			V6C 3E8

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	HEARTLAND OIL & GAS LTD
		DATE OF NAME CHANGE:	20030226

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ADRIATIC HOLDINGS LTD
		DATE OF NAME CHANGE:	19981221
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-06-21</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001075636</issuerCik>
        <issuerName>HEARTLAND OIL &amp; GAS CORP</issuerName>
        <issuerTradingSymbol>HOGC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001258104</rptOwnerCik>
            <rptOwnerName>BUCHAMER RANDY GLEN</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2988 BROOKRIDGE DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NORTH VANCOUVER BC CANADA</rptOwnerCity>
            <rptOwnerState>A1</rptOwnerState>
            <rptOwnerZipCode>V7R3A8</rptOwnerZipCode>
            <rptOwnerStateDescription>BRITISH COLUMBIA, CANADA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2004-06-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.1</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>25000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>170000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>170000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">70,000 options exercisable at $0.50 and 100,000 options exercisable at $2.50.</footnote>
        <footnote id="F2">70,000 option exercisable 12/2/2002 and 100,000 option exercisable 4/28/2004</footnote>
        <footnote id="F3">70,000 option expire 12/2/2005 and 100,000 option expire 4/28/2014</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Randy Buchamer</signatureName>
        <signatureDate>2004-06-22</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----