-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 WtEKNIIJycFyJViXbJkq0QQDPYMNDtHdeCqmpdUGEqoNq/edWNW4yvzlZJhbJIfy
 9ZfIqcQiSs0+S+2Re0pPug==

<SEC-DOCUMENT>0001235802-08-000135.txt : 20081027
<SEC-HEADER>0001235802-08-000135.hdr.sgml : 20081027
<ACCEPTANCE-DATETIME>20081027120246
ACCESSION NUMBER:		0001235802-08-000135
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20081024
FILED AS OF DATE:		20081027
DATE AS OF CHANGE:		20081027

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MESABI TRUST
		CENTRAL INDEX KEY:			0000065172
		STANDARD INDUSTRIAL CLASSIFICATION:	MINERAL ROYALTY TRADERS [6795]
		IRS NUMBER:				136022277
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			0131

	BUSINESS ADDRESS:	
		STREET 1:		P O BOX 318 CHURCH ST STATION
		STREET 2:		C/O BANKERS TRUST CO CORP TRUST
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10008-0318
		BUSINESS PHONE:		2122506519

	MAIL ADDRESS:	
		STREET 1:		C/O BANKERS TRUST COMPANY, CORPORATE
		STREET 2:		P.O. BOX 318 CHURCH STREET STATION
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10008-0318

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Ehrenberg James A
		CENTRAL INDEX KEY:			0001351256

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-04488
		FILM NUMBER:		081141687

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		612-750-9349

	MAIL ADDRESS:	
		STREET 1:		295 KOPP DRIVE
		CITY:			WEST ST. PAUL
		STATE:			MN
		ZIP:			55118
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-10-24</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000065172</issuerCik>
        <issuerName>MESABI TRUST</issuerName>
        <issuerTradingSymbol>MSB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001351256</rptOwnerCik>
            <rptOwnerName>Ehrenberg James A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>295 KOPP DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WEST ST. PAUL</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55118</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Trustee</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Units of Beneficial Interest</value>
            </securityTitle>
            <transactionDate>
                <value>2008-10-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>13.2699</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2500</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>/s/ James A. Ehrenberg</signatureName>
        <signatureDate>2008-10-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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