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Mesabi Trust – ‘10-Q’ for 4/30/20 – ‘EX-101.LAB’

On:  Monday, 6/8/20, at 4:31pm ET   ·   For:  4/30/20   ·   Accession #:  1558370-20-7352   ·   File #:  1-04488

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  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 6/08/20  Mesabi Trust                      10-Q        4/30/20   29:1.7M                                   Toppan Merrill Bridge/FA

Quarterly Report   —   Form 10-Q   —   Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q        Quarterly Report                                    HTML    317K 
 4: EX-99.1     Miscellaneous Exhibit                               HTML     14K 
 2: EX-31       Certification -- §302 - SOA'02                      HTML     20K 
 3: EX-32       Certification -- §906 - SOA'02                      HTML     14K 
14: R1          Document and Entity Information                     HTML     40K 
25: R2          Statements of Income                                HTML     38K 
29: R3          Balance Sheets                                      HTML     57K 
18: R4          Balance Sheets (Parenthetical)                      HTML     13K 
13: R5          Statements of Cash Flows                            HTML     63K 
24: R6          Nature of Business and Organization                 HTML     19K 
28: R7          Summary of Significant Accounting Policies          HTML     40K 
19: R8          Dividend and Distribution                           HTML     14K 
12: R9          Royalty Agreement, Unallocated Reserve and          HTML     94K 
                Distributions                                                    
21: R10         Summary of Significant Accounting Policies          HTML     14K 
                (Policies)                                                       
16: R11         Summary of Significant Accounting Policies          HTML     28K 
                (Tables)                                                         
23: R12         Unallocated Reserve and Distributions (Tables)      HTML     92K 
27: R13         Summary of Significant Accounting Policies          HTML     14K 
                (Details)                                                        
20: R14         Summary of Significant Accounting Policies -        HTML     51K 
                Revenue (Details)                                                
15: R15         Dividend and Distribution (Details)                 HTML     13K 
22: R16         Unallocated Reserve and Distributions (Details)     HTML     43K 
17: XML         IDEA XML File -- Filing Summary                      XML     42K 
26: EXCEL       IDEA Workbook of Financial Reports                  XLSX     22K 
 5: EX-101.INS  XBRL Instance -- msb-20200430                        XML    331K 
 7: EX-101.CAL  XBRL Calculations -- msb-20200430_cal                XML     59K 
 8: EX-101.DEF  XBRL Definitions -- msb-20200430_def                 XML     59K 
 9: EX-101.LAB  XBRL Labels -- msb-20200430_lab                      XML    305K 
10: EX-101.PRE  XBRL Presentations -- msb-20200430_pre               XML    181K 
 6: EX-101.SCH  XBRL Schema -- msb-20200430                          XSD     62K 
11: ZIP         XBRL Zipped Folder -- 0001558370-20-007352-xbrl      Zip     36K

‘EX-101.LAB’   —   XBRL Labels — msb-20200430_lab

This Exhibit is an XBRL XML File.

                                                                                                                                                                                
<?xml version="1.0" encoding="windows-1252"?>
<!-- XBRL document created with Toppan Merrill Bridge 9.6.0.116 -->
<!-- Based on XBRL 2.1 -->
<!-- Created on: 6/8/2020 3:20:07 PM -->
<!-- Modified on: 6/8/2020 3:20:07 PM -->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrli="http://www.xbrl.org/2003/instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
<roleRef xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel" roleURI="http://www.xbrl.org/2009/role/negatedLabel" xmlns="http://www.xbrl.org/2003/linkbase"/>
<link:labelLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_DocumentAndEntityInformationAbstract" xlink:label="msb_DocumentAndEntityInformationAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_DocumentAndEntityInformationAbstract" xlink:to="msb_DocumentAndEntityInformationAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_DocumentAndEntityInformationAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Document and Entity Information </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementTable_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementTable_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Statement [Table] </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementLineItems_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementLineItems_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Statement [Line Items] </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentType" xlink:label="dei_DocumentType" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentType" xlink:to="dei_DocumentType_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentType_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Document Type </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodEndDate" xlink:to="dei_DocumentPeriodEndDate_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodEndDate_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Document Period End Date </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityRegistrantName" xlink:to="dei_EntityRegistrantName_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityRegistrantName_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Entity Registrant Name </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="dei_EntityCurrentReportingStatus" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCurrentReportingStatus" xlink:to="dei_EntityCurrentReportingStatus_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCurrentReportingStatus_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Entity Current Reporting Status </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityInteractiveDataCurrent" xlink:label="dei_EntityInteractiveDataCurrent" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityInteractiveDataCurrent" xlink:to="dei_EntityInteractiveDataCurrent_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Entity Interactive Data Current </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFilerCategory" xlink:label="dei_EntityFilerCategory" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFilerCategory" xlink:to="dei_EntityFilerCategory_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityFilerCategory_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Entity Filer Category </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntitySmallBusiness" xlink:label="dei_EntitySmallBusiness" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntitySmallBusiness" xlink:to="dei_EntitySmallBusiness_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntitySmallBusiness_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Entity Small Business </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="dei_EntityEmergingGrowthCompany" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityEmergingGrowthCompany" xlink:to="dei_EntityEmergingGrowthCompany_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Entity Emerging Growth Company </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityShellCompany" xlink:label="dei_EntityShellCompany" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityShellCompany" xlink:to="dei_EntityShellCompany_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityShellCompany_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Entity Shell Company </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="dei_EntityCommonStockSharesOutstanding" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCommonStockSharesOutstanding" xlink:to="dei_EntityCommonStockSharesOutstanding_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Entity Common Stock, Shares Outstanding </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="dei_CurrentFiscalYearEndDate" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CurrentFiscalYearEndDate" xlink:to="dei_CurrentFiscalYearEndDate_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Current Fiscal Year End Date </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="dei_DocumentFiscalYearFocus" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalYearFocus" xlink:to="dei_DocumentFiscalYearFocus_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalYearFocus_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Document Fiscal Year Focus </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="dei_DocumentFiscalPeriodFocus" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalPeriodFocus" xlink:to="dei_DocumentFiscalPeriodFocus_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Document Fiscal Period Focus </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCentralIndexKey" xlink:to="dei_EntityCentralIndexKey_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCentralIndexKey_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Entity Central Index Key </label>
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentFlag" xlink:to="dei_AmendmentFlag_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AmendmentFlag_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Amendment Flag </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="us-gaap_IncomeStatementAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_IncomeStatementAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Statements of Income </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="us-gaap_RevenuesAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenuesAbstract" xlink:to="us-gaap_RevenuesAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RevenuesAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenues [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_RevenuesAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> REVENUES </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:to="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Royalty Revenue </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Royalty income </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="us-gaap_InvestmentIncomeInterest" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeInterest" xlink:to="us-gaap_InvestmentIncomeInterest_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentIncomeInterest_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Investment Income, Interest </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_InvestmentIncomeInterest_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Interest </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Revenues" xlink:label="us-gaap_Revenues" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Revenues" xlink:to="us-gaap_Revenues_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Revenues_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenues </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Revenues_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Total revenues </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="us-gaap_OperatingExpensesAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OperatingExpensesAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpensesAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Operating Expenses [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_OperatingExpensesAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> EXPENSES </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="us-gaap_CostOfGoodsAndServicesSold" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CostOfGoodsAndServicesSold" xlink:to="us-gaap_CostOfGoodsAndServicesSold_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CostOfGoodsAndServicesSold_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> General and Administrative Expense </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_CostOfGoodsAndServicesSold_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Expenses </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="us-gaap_NetIncomeLoss" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetIncomeLoss_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net Income (Loss) Attributable to Parent </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetIncomeLoss_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net income </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetIncomeLoss_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net income </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Weighted Average Number of Shares Outstanding, Basic </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Number of units outstanding </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> WEIGHTED AVERAGE NUMBER OF UNITS OUTSTANDING </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="us-gaap_EarningsPerShareBasic" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareBasic" xlink:to="us-gaap_EarningsPerShareBasic_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Earnings Per Share, Basic </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net income per unit (Note 2) (in dollars per unit) </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_DistributionDeclaredDistributionsPaidPerUnit" xlink:label="msb_DistributionDeclaredDistributionsPaidPerUnit" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_DistributionDeclaredDistributionsPaidPerUnit" xlink:to="msb_DistributionDeclaredDistributionsPaidPerUnit_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_DistributionDeclaredDistributionsPaidPerUnit_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Represents the cash distributions per unit declared and paid by the entity during the period for all units of stock. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_DistributionDeclaredDistributionsPaidPerUnit_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Distribution Declared Distributions Paid Per Unit </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_DistributionDeclaredDistributionsPaidPerUnit_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Distribution declared per unit (Note 3) (in dollars per unit) </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="msb_DistributionDeclaredDistributionsPaidPerUnit_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Distributions declared per unit (in dollars per unit) </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="us-gaap_StatementOfFinancialPositionAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_StatementOfFinancialPositionAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Balance Sheets </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="us-gaap_AssetsAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_AssetsAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Assets [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_AssetsAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> ASSETS </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Cash and Cash Equivalents, at Carrying Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Cash and cash equivalents, end of period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Cash and cash equivalents, beginning of period </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Cash and cash equivalents </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HeldToMaturitySecuritiesCurrent" xlink:label="us-gaap_HeldToMaturitySecuritiesCurrent" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_HeldToMaturitySecuritiesCurrent" xlink:to="us-gaap_HeldToMaturitySecuritiesCurrent_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_HeldToMaturitySecuritiesCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Held-to-maturity Securities, Current </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_HeldToMaturitySecuritiesCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> U.S. Government securities, at amortized cost (which approximates fair value) </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="us-gaap_AccountsReceivableNetCurrent" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountsReceivableNetCurrent" xlink:to="us-gaap_AccountsReceivableNetCurrent_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Accrued Income Receivable </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Accrued income receivable </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="us-gaap_PrepaidExpenseCurrent" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PrepaidExpenseCurrent" xlink:to="us-gaap_PrepaidExpenseCurrent_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PrepaidExpenseCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Prepaid Expense, Current </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PrepaidExpenseCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Prepaid expenses </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="us-gaap_AssetsCurrent" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrent" xlink:to="us-gaap_AssetsCurrent_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Assets, Current </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_AssetsCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Current assets </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_FixedPropertyIncludingIntangibleAbstract" xlink:label="msb_FixedPropertyIncludingIntangibleAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_FixedPropertyIncludingIntangibleAbstract" xlink:to="msb_FixedPropertyIncludingIntangibleAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_FixedPropertyIncludingIntangibleAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Fixed Property Including Intangible [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_FixedPropertyIncludingIntangibleAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Fixed property, including intangibles, at nominal values </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_AssignmentsOfLeasedPropertyAbstract" xlink:label="msb_AssignmentsOfLeasedPropertyAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_AssignmentsOfLeasedPropertyAbstract" xlink:to="msb_AssignmentsOfLeasedPropertyAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_AssignmentsOfLeasedPropertyAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Assignments of Leased Property [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_AssignmentsOfLeasedPropertyAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Assignments of leased property </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_AmendedAssignmentsOfLeaseProperty" xlink:label="msb_AmendedAssignmentsOfLeaseProperty" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_AmendedAssignmentsOfLeaseProperty" xlink:to="msb_AmendedAssignmentsOfLeaseProperty_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_AmendedAssignmentsOfLeaseProperty_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The interest as assignor in the Amended Assignment of Peters Lease. The Peters Lease provides that each leasehold estate will continue until the reserves of iron ore, taconite and other minerals or materials on the land subject to the Peters Lease are exhausted. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_AmendedAssignmentsOfLeaseProperty_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Amended Assignments of Lease Property </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="msb_AmendedAssignmentsOfLeaseProperty_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Amended assignment of Peters Lease </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_AssignmentsOfLeasedProperty" xlink:label="msb_AssignmentsOfLeasedProperty" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_AssignmentsOfLeasedProperty" xlink:to="msb_AssignmentsOfLeasedProperty_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_AssignmentsOfLeasedProperty_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The interest as assignor in the Amended Assignment of Cloquet Lease, executed in 1916 between Cloquet Lumber Company and Claude W. Peters. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_AssignmentsOfLeasedProperty_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Assignments of Leased Property </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="msb_AssignmentsOfLeasedProperty_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Assignment of Cloquet Leases </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_CertificateOfBeneficialInterestLandTrust" xlink:label="msb_CertificateOfBeneficialInterestLandTrust" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_CertificateOfBeneficialInterestLandTrust" xlink:to="msb_CertificateOfBeneficialInterestLandTrust_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_CertificateOfBeneficialInterestLandTrust_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Carrying value as of the balance sheet date of the transferable units distributed to shareholders of Mesabi Iron Company as beneficial interest in Mesabi Trust. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_CertificateOfBeneficialInterestLandTrust_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Certificate of Beneficial Interest Land Trust </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="msb_CertificateOfBeneficialInterestLandTrust_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Certificate of beneficial interest for 13,120,010 units of Land Trust </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_FixedPropertyIncludingIntangible" xlink:label="msb_FixedPropertyIncludingIntangible" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_FixedPropertyIncludingIntangible" xlink:to="msb_FixedPropertyIncludingIntangible_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_FixedPropertyIncludingIntangible_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Sum of the carrying amounts as of the balance sheet date of all fixed and intangible assets that are recognized at nominal value. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_FixedPropertyIncludingIntangible_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Fixed Property Including Intangible </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="msb_FixedPropertyIncludingIntangible_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Total fixed property </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Assets_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Assets </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Assets_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Total assets </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Liabilities and Equity [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> LIABILITIES, UNALLOCATED RESERVE AND TRUST CORPUS </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestAndDividendsPayableCurrent" xlink:label="us-gaap_InterestAndDividendsPayableCurrent" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestAndDividendsPayableCurrent" xlink:to="us-gaap_InterestAndDividendsPayableCurrent_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestAndDividendsPayableCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Interest and Dividends Payable, Current </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_InterestAndDividendsPayableCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Distribution payable </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestAndDividendsPayableCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Distribution payable </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedLiabilitiesCurrentAndNoncurrent" xlink:label="us-gaap_AccruedLiabilitiesCurrentAndNoncurrent" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedLiabilitiesCurrentAndNoncurrent" xlink:to="us-gaap_AccruedLiabilitiesCurrentAndNoncurrent_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccruedLiabilitiesCurrentAndNoncurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Accrued Liabilities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AccruedLiabilitiesCurrentAndNoncurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Accrued expenses </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_ContractLiabilityNetOfContractAsset" xlink:label="msb_ContractLiabilityNetOfContractAsset" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_ContractLiabilityNetOfContractAsset" xlink:to="msb_ContractLiabilityNetOfContractAsset_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_ContractLiabilityNetOfContractAsset_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The net amount of contract liabilities less contract assets, when that result is a liability balance. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_ContractLiabilityNetOfContractAsset_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Contract Liability Net Of Contract Asset </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_ContractLiabilityNetOfContractAsset_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net contract liability </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities" xlink:label="us-gaap_Liabilities" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Liabilities" xlink:to="us-gaap_Liabilities_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Liabilities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Liabilities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Liabilities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Total liabilities </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_UnallocatedReserve" xlink:label="msb_UnallocatedReserve" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_UnallocatedReserve" xlink:to="msb_UnallocatedReserve_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_UnallocatedReserve_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The cumulative amount of the reporting entity's undistributed earnings or deficit, consisting primarily of accrued income receivable representing royalties not yet received by the Trust but anticipated to be received in future periods. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_UnallocatedReserve_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Unallocated Reserve </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_UnallocatedReserve_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Unallocated reserve </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalUnits" xlink:label="us-gaap_CapitalUnits" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CapitalUnits" xlink:to="us-gaap_CapitalUnits_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CapitalUnits_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Capital Units, Value </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CapitalUnits_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Trust corpus </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Liabilities and Equity </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Total liabilities, unallocated reserve and trust corpus </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="us-gaap_SharesOutstanding" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesOutstanding" xlink:to="us-gaap_SharesOutstanding_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharesOutstanding_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Shares, Outstanding </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SharesOutstanding_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Certificate of beneficial interest of Land Trust, units </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="us-gaap_StatementOfCashFlowsAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_StatementOfCashFlowsAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Statements of Cash Flows </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Operating activities </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromRoyaltiesReceived" xlink:label="us-gaap_ProceedsFromRoyaltiesReceived" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromRoyaltiesReceived" xlink:to="us-gaap_ProceedsFromRoyaltiesReceived_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromRoyaltiesReceived_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Proceeds from Royalties Received </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromRoyaltiesReceived_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Royalties received </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfSecuritiesOperatingActivities" xlink:label="us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfSecuritiesOperatingActivities" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfSecuritiesOperatingActivities" xlink:to="us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfSecuritiesOperatingActivities_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfSecuritiesOperatingActivities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Proceeds from Maturities, Prepayments and Calls of Securities, Operating Activities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfSecuritiesOperatingActivities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Interest received </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForOperatingActivities" xlink:label="us-gaap_PaymentsForOperatingActivities" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsForOperatingActivities" xlink:to="us-gaap_PaymentsForOperatingActivities_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsForOperatingActivities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Payments for Operating Activities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsForOperatingActivities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Expenses paid </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net Cash Provided by (Used in) Operating Activities, Continuing Operations </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net cash from (used for) operating activities </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Investing activities </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities" xlink:label="us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities" xlink:to="us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Maturities of U.S. Government securities </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireHeldToMaturitySecurities" xlink:label="us-gaap_PaymentsToAcquireHeldToMaturitySecurities" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquireHeldToMaturitySecurities" xlink:to="us-gaap_PaymentsToAcquireHeldToMaturitySecurities_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsToAcquireHeldToMaturitySecurities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Payments to Acquire Held-to-maturity Securities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsToAcquireHeldToMaturitySecurities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Purchases of U.S. Government securities </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net Cash Provided by (Used in) Investing Activities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net cash from investing activities </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Financing activity </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfDividends" xlink:label="us-gaap_PaymentsOfDividends" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsOfDividends" xlink:to="us-gaap_PaymentsOfDividends_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsOfDividends_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Payments of Dividends </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsOfDividends_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Distributions to unitholders </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_PaymentsOfDividends_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Distributed cash payments </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Cash and Cash Equivalents, Period Increase (Decrease) </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net change in cash and cash equivalents </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Increase (Decrease) in Operating Capital [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Reconciliation of net income to net cash from operating activities </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="us-gaap_ProfitLoss" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProfitLoss" xlink:to="us-gaap_ProfitLoss_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProfitLoss_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net Income (Loss), Including Portion Attributable to Noncontrolling Interest </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProfitLoss_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Net income </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:to="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Increase Decrease In Accrued Royalties Receivable </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Decrease (increase) in accrued income receivable </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerAsset" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerAsset" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInContractWithCustomerAsset" xlink:to="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Increase Decrease In Contract With Customer Asset </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Increase in contract asset </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidExpense" xlink:label="us-gaap_IncreaseDecreaseInPrepaidExpense" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInPrepaidExpense" xlink:to="us-gaap_IncreaseDecreaseInPrepaidExpense_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInPrepaidExpense_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Increase (Decrease) in Prepaid Expense </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInPrepaidExpense_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Increase in prepaid expense </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:to="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Increase (Decrease) in Accrued Liabilities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Increase (decrease) in accrued expenses </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInContractWithCustomerLiability" xlink:to="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Increase Decrease In Contract With Customer Liability </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Decrease in contract liability </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:to="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Non cash financing activity </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_DistributionsDeclared" xlink:label="msb_DistributionsDeclared" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_DistributionsDeclared" xlink:to="msb_DistributionsDeclared_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_DistributionsDeclared_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> This element represents non cash financing activity of distribution declared. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_DistributionsDeclared_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Distributions Declared </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="msb_DistributionsDeclared_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Distributions declared and payable </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:to="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> NATURE OF BUSINESS AND ORGANIZATION </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:to="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> NATURE OF BUSINESS AND ORGANIZATION </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="us-gaap_AccountingPoliciesAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_AccountingPoliciesAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountingPoliciesAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SignificantAccountingPoliciesTextBlock" xlink:to="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Significant Accounting Policies [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_DividendAndDistributionDisclosureAbstract" xlink:label="msb_DividendAndDistributionDisclosureAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_DividendAndDistributionDisclosureAbstract" xlink:to="msb_DividendAndDistributionDisclosureAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_DividendAndDistributionDisclosureAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> DIVIDEND AND DISTRIBUTION </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_DividendAndDistributionDisclosureTextBlock" xlink:label="msb_DividendAndDistributionDisclosureTextBlock" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_DividendAndDistributionDisclosureTextBlock" xlink:to="msb_DividendAndDistributionDisclosureTextBlock_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_DividendAndDistributionDisclosureTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The entire narrative disclosure of dividend and other distributions made as per the prevalent notification and is pad usually at the end of the reporting period. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_DividendAndDistributionDisclosureTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Dividend and Distribution Disclosure [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_DividendAndDistributionDisclosureTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> DIVIDEND AND DISTRIBUTION </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RoyaltyAgreementUnallocatedReserveAndDistributionsDisclosureAbstract" xlink:label="msb_RoyaltyAgreementUnallocatedReserveAndDistributionsDisclosureAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RoyaltyAgreementUnallocatedReserveAndDistributionsDisclosureAbstract" xlink:to="msb_RoyaltyAgreementUnallocatedReserveAndDistributionsDisclosureAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RoyaltyAgreementUnallocatedReserveAndDistributionsDisclosureAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> n/a </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RoyaltyAgreementUnallocatedReserveAndDistributionsDisclosureAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> UNALLOCATED RESERVE AND DISTRIBUTIONS </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RoyaltyAgreementUnallocatedReservesAndDistributionsTextBlock" xlink:label="msb_RoyaltyAgreementUnallocatedReservesAndDistributionsTextBlock" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RoyaltyAgreementUnallocatedReservesAndDistributionsTextBlock" xlink:to="msb_RoyaltyAgreementUnallocatedReservesAndDistributionsTextBlock_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RoyaltyAgreementUnallocatedReservesAndDistributionsTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> This text block provides information about revenue recognition and royalty rate structures, and describes the maintenance of unallocated reserve and determination of distributions. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RoyaltyAgreementUnallocatedReservesAndDistributionsTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Royalty Agreement Unallocated Reserves And Distributions [Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RoyaltyAgreementUnallocatedReservesAndDistributionsTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> ROYALTY AGREEMENT, UNALLOCATED RESERVE AND DISTRIBUTIONS </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerPolicyTextBlock" xlink:label="us-gaap_RevenueFromContractWithCustomerPolicyTextBlock" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenueFromContractWithCustomerPolicyTextBlock" xlink:to="us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenue From Contract With Customer [Policy Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenue recognition </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="us-gaap_DisaggregationOfRevenueTable" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DisaggregationOfRevenueTable" xlink:to="us-gaap_DisaggregationOfRevenueTable_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DisaggregationOfRevenueTable_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Disaggregation of Revenue [Table] </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="us-gaap_DisaggregationOfRevenueLineItems" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DisaggregationOfRevenueLineItems" xlink:to="us-gaap_DisaggregationOfRevenueLineItems_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DisaggregationOfRevenueLineItems_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Disaggregation of Revenue [Line Items] </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueTableTextBlock" xlink:label="us-gaap_DisaggregationOfRevenueTableTextBlock" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DisaggregationOfRevenueTableTextBlock" xlink:to="us-gaap_DisaggregationOfRevenueTableTextBlock_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DisaggregationOfRevenueTableTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Disaggregation of Revenue [Table Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DisaggregationOfRevenueTableTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Schedule of disaggregation of revenue </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_UnallocatedReserveAndDistributionsTableTextBlock" xlink:label="msb_UnallocatedReserveAndDistributionsTableTextBlock" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_UnallocatedReserveAndDistributionsTableTextBlock" xlink:to="msb_UnallocatedReserveAndDistributionsTableTextBlock_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_UnallocatedReserveAndDistributionsTableTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Tabular disclosure of unallocated cash and U.S. Government securities portion of the Trust's Unallocated Reserve. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_UnallocatedReserveAndDistributionsTableTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Unallocated Reserve and Distributions [Table Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="msb_UnallocatedReserveAndDistributionsTableTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Schedule of unallocated cash and U.S. Government securities portion of the Trust's Unallocated Reserve </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_UnallocatedReserveAndDistributionsReconciliationTableTextBlock" xlink:label="msb_UnallocatedReserveAndDistributionsReconciliationTableTextBlock" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_UnallocatedReserveAndDistributionsReconciliationTableTextBlock" xlink:to="msb_UnallocatedReserveAndDistributionsReconciliationTableTextBlock_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_UnallocatedReserveAndDistributionsReconciliationTableTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Tabular disclosure of reconciliation of the Trust's Unallocated Reserve. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_UnallocatedReserveAndDistributionsReconciliationTableTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Unallocated Reserve and Distributions Reconciliation [Table Text Block] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_UnallocatedReserveAndDistributionsReconciliationTableTextBlock_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Schedule of reconciliation of Trust's Unallocated Reserve </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract" xlink:label="us-gaap_RevenueFromContractWithCustomerAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenueFromContractWithCustomerAbstract" xlink:to="us-gaap_RevenueFromContractWithCustomerAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RevenueFromContractWithCustomerAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenue from Contract with Customer [Abstract] </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RevenuePortionPercentageForFirstTierOfConsideration" xlink:label="msb_RevenuePortionPercentageForFirstTierOfConsideration" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RevenuePortionPercentageForFirstTierOfConsideration" xlink:to="msb_RevenuePortionPercentageForFirstTierOfConsideration_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RevenuePortionPercentageForFirstTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The percentage applied to the quantity shipped in the first tier, to determine the quantity on which royalties are earned. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RevenuePortionPercentageForFirstTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenue, Portion Percentage For First Tier Of Consideration </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RevenuePortionPercentageForFirstTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Base overriding royalties, first tier portion percentage </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RevenueCeilingQuantityForFirstTierOfConsideration" xlink:label="msb_RevenueCeilingQuantityForFirstTierOfConsideration" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RevenueCeilingQuantityForFirstTierOfConsideration" xlink:to="msb_RevenueCeilingQuantityForFirstTierOfConsideration_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RevenueCeilingQuantityForFirstTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The ceiling quantity for the first tier of base overriding royalties earned. Shipments up to this amount are subject to the first tier portion percentage in calculating the royalties earned. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RevenueCeilingQuantityForFirstTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenue, Ceiling Quantity For First Tier Of Consideration </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RevenueCeilingQuantityForFirstTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Base overriding royalties, first tier shipment ceiling (in million tons) </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RevenuePortionPercentageForSecondTierOfConsideration" xlink:label="msb_RevenuePortionPercentageForSecondTierOfConsideration" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RevenuePortionPercentageForSecondTierOfConsideration" xlink:to="msb_RevenuePortionPercentageForSecondTierOfConsideration_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RevenuePortionPercentageForSecondTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The percentage applied to the quantity shipped in the second tier, to determine the quantity on which royalties are earned. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RevenuePortionPercentageForSecondTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenue, Portion Percentage For Second Tier Of Consideration </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RevenuePortionPercentageForSecondTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Base overriding royalties, second tier portion percentage </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RevenueCeilingQuantityForSecondTierOfConsideration" xlink:label="msb_RevenueCeilingQuantityForSecondTierOfConsideration" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RevenueCeilingQuantityForSecondTierOfConsideration" xlink:to="msb_RevenueCeilingQuantityForSecondTierOfConsideration_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RevenueCeilingQuantityForSecondTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The ceiling quantity for the second tier of base overriding royalties earned. Shipments up to this amount, above the first tier ceiling, are subject to the second tier portion percentage in calculating the royalties earned. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RevenueCeilingQuantityForSecondTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenue, Ceiling Quantity For Second Tier Of Consideration </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RevenueCeilingQuantityForSecondTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Base overriding royalties, second tier shipment ceiling (in million tons) </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RevenuePortionPercentageForThirdTierOfConsideration" xlink:label="msb_RevenuePortionPercentageForThirdTierOfConsideration" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RevenuePortionPercentageForThirdTierOfConsideration" xlink:to="msb_RevenuePortionPercentageForThirdTierOfConsideration_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RevenuePortionPercentageForThirdTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The percentage applied to the quantity shipped in the third tier, to determine the quantity on which royalties are earned. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RevenuePortionPercentageForThirdTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenue, Portion Percentage For Third Tier Of Consideration </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RevenuePortionPercentageForThirdTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Base overriding royalties, third tier portion percentage </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RevenueThresholdQuantityForThirdTierOfConsideration" xlink:label="msb_RevenueThresholdQuantityForThirdTierOfConsideration" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RevenueThresholdQuantityForThirdTierOfConsideration" xlink:to="msb_RevenueThresholdQuantityForThirdTierOfConsideration_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RevenueThresholdQuantityForThirdTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The threshold quantity for the third tier of base overriding royalties earned. Shipments above this amount are subject to the third tier portion percentage in calculating the royalties earned. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RevenueThresholdQuantityForThirdTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenue, Threshold Quantity For Third Tier Of Consideration </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RevenueThresholdQuantityForThirdTierOfConsideration_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Base overriding royalties, third tier shipment threshold (in million tons) </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RevenueNumberOfVolumeThresholdsForVariableTransactionPrice" xlink:label="msb_RevenueNumberOfVolumeThresholdsForVariableTransactionPrice" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RevenueNumberOfVolumeThresholdsForVariableTransactionPrice" xlink:to="msb_RevenueNumberOfVolumeThresholdsForVariableTransactionPrice_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RevenueNumberOfVolumeThresholdsForVariableTransactionPrice_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The number of volume thresholds used to determine the transaction price. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RevenueNumberOfVolumeThresholdsForVariableTransactionPrice_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenue, Number Of Volume Thresholds For Variable Transaction Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RevenueNumberOfVolumeThresholdsForVariableTransactionPrice_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Base overriding royalties, number of volume thresholds for transaction price </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RevenueVolumeThresholdForTransactionPrice" xlink:label="msb_RevenueVolumeThresholdForTransactionPrice" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RevenueVolumeThresholdForTransactionPrice" xlink:to="msb_RevenueVolumeThresholdForTransactionPrice_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RevenueVolumeThresholdForTransactionPrice_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The quantity shipped which serves as a threshold to determine transaction price. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RevenueVolumeThresholdForTransactionPrice_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenue, Volume Threshold For Transaction Price </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RevenueVolumeThresholdForTransactionPrice_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Base overriding royalties, volume threshold for transaction price </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RevenueRecognitionNumberOfContracts" xlink:label="msb_RevenueRecognitionNumberOfContracts" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RevenueRecognitionNumberOfContracts" xlink:to="msb_RevenueRecognitionNumberOfContracts_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RevenueRecognitionNumberOfContracts_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The number of revenue-generating contracts giving rise to contract asset and liability. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RevenueRecognitionNumberOfContracts_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Revenue Recognition, Number Of Contracts </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RevenueRecognitionNumberOfContracts_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Number of customer contracts </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerAssetNetCurrent" xlink:label="us-gaap_ContractWithCustomerAssetNetCurrent" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerAssetNetCurrent" xlink:to="us-gaap_ContractWithCustomerAssetNetCurrent_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractWithCustomerAssetNetCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Contract with Customer, Asset, Net, Current </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ContractWithCustomerAssetNetCurrent_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Contract asset </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiability" xlink:label="us-gaap_ContractWithCustomerLiability" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerLiability" xlink:to="us-gaap_ContractWithCustomerLiability_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractWithCustomerLiability_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Contract with Customer, Liability </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ContractWithCustomerLiability_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Contract liability </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_PeriodAfterEachCalendarQuarterWhenEntityFiscalQuarterEnds" xlink:label="msb_PeriodAfterEachCalendarQuarterWhenEntityFiscalQuarterEnds" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_PeriodAfterEachCalendarQuarterWhenEntityFiscalQuarterEnds" xlink:to="msb_PeriodAfterEachCalendarQuarterWhenEntityFiscalQuarterEnds_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_PeriodAfterEachCalendarQuarterWhenEntityFiscalQuarterEnds_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Represents the period after the close of each calendar quarter when the fiscal quarter of the entity ends. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_PeriodAfterEachCalendarQuarterWhenEntityFiscalQuarterEnds_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Period after Each Calendar Quarter when Entity Fiscal Quarter Ends </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_PeriodAfterEachCalendarQuarterWhenEntityFiscalQuarterEnds_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Period after the close of each calendar quarter when the fiscal quarter ends </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_UnallocatedReserveAndDistributionsTable" xlink:label="msb_UnallocatedReserveAndDistributionsTable" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_UnallocatedReserveAndDistributionsTable" xlink:to="msb_UnallocatedReserveAndDistributionsTable_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_UnallocatedReserveAndDistributionsTable_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Schedule of the Trust's Unallocated Reserve and distributions. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_UnallocatedReserveAndDistributionsTable_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Unallocated Reserve and Distributions [Table] </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="us-gaap_StatementEquityComponentsAxis" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_StatementEquityComponentsAxis_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Equity Components [Axis] </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="us-gaap_EquityComponentDomain" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_EquityComponentDomain_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EquityComponentDomain_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Equity Component [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EquityComponentDomain_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Equity Component [Domain] </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_UnallocatedReserveMember" xlink:label="msb_UnallocatedReserveMember" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_UnallocatedReserveMember" xlink:to="msb_UnallocatedReserveMember_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_UnallocatedReserveMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The cumulative amount of the reporting trust's undistributed earnings or deficit and accrued income receivable primarily representing royalties not yet received by the Trust but anticipated to be received in future periods. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_UnallocatedReserveMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Unallocated Reserve [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_UnallocatedReserveMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Unallocated Reserve </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_TrustCorpusMember" xlink:label="msb_TrustCorpusMember" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_TrustCorpusMember" xlink:to="msb_TrustCorpusMember_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_TrustCorpusMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> This element represent trust Corpus amount member. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_TrustCorpusMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Trust Corpus [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_TrustCorpusMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Trust Corpus </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RoyaltyAgreementUnallocatedReserveAndDistributionsLineItems" xlink:label="msb_RoyaltyAgreementUnallocatedReserveAndDistributionsLineItems" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RoyaltyAgreementUnallocatedReserveAndDistributionsLineItems" xlink:to="msb_RoyaltyAgreementUnallocatedReserveAndDistributionsLineItems_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RoyaltyAgreementUnallocatedReserveAndDistributionsLineItems_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> n/a </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RoyaltyAgreementUnallocatedReserveAndDistributionsLineItems_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Royalty Agreement Unallocated Reserve And Distributions [Line Items] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RoyaltyAgreementUnallocatedReserveAndDistributionsLineItems_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> UNALLOCATED RESERVE AND DISTRIBUTIONS </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_UnallocatedReserveComponentsAbstract" xlink:label="msb_UnallocatedReserveComponentsAbstract" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_UnallocatedReserveComponentsAbstract" xlink:to="msb_UnallocatedReserveComponentsAbstract_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_UnallocatedReserveComponentsAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> n/a </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_UnallocatedReserveComponentsAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Unallocated Reserve Components [Abstract] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_UnallocatedReserveComponentsAbstract_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Unallocated Cash and Securities portion of Unallocated Reserve </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_CashAndCashEquivalentsAndUSGovernmentSecurities" xlink:label="msb_CashAndCashEquivalentsAndUSGovernmentSecurities" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_CashAndCashEquivalentsAndUSGovernmentSecurities" xlink:to="msb_CashAndCashEquivalentsAndUSGovernmentSecurities_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_CashAndCashEquivalentsAndUSGovernmentSecurities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Represents the amount of currency on hand as well as demand deposits with banks or financial institutions and U.S. Government securities. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_CashAndCashEquivalentsAndUSGovernmentSecurities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Cash and Cash Equivalents and US Government Securities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="msb_CashAndCashEquivalentsAndUSGovernmentSecurities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Cash and U.S. Government securities </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_UnallocatedCashAndCashEquivalentsAndUSGovernmentSecurities" xlink:label="msb_UnallocatedCashAndCashEquivalentsAndUSGovernmentSecurities" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_UnallocatedCashAndCashEquivalentsAndUSGovernmentSecurities" xlink:to="msb_UnallocatedCashAndCashEquivalentsAndUSGovernmentSecurities_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_UnallocatedCashAndCashEquivalentsAndUSGovernmentSecurities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Represents the maintained level of unallocated reserve in the form of cash and U.S. Government securities. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_UnallocatedCashAndCashEquivalentsAndUSGovernmentSecurities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Unallocated Cash and Cash Equivalents and US Government Securities </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="msb_UnallocatedCashAndCashEquivalentsAndUSGovernmentSecurities_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Unallocated cash and U.S. Government securities </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_UnallocatedReserveAndDistributionsRollForward" xlink:label="msb_UnallocatedReserveAndDistributionsRollForward" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_UnallocatedReserveAndDistributionsRollForward" xlink:to="msb_UnallocatedReserveAndDistributionsRollForward_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_UnallocatedReserveAndDistributionsRollForward_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Unallocated Reserve and Distributions [Roll Forward] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_UnallocatedReserveAndDistributionsRollForward_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Reconciliation of Trust's Unallocated Reserve </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:to="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Ending Balance </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Beginning Balance </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_DistributionsPaidAndDeclared" xlink:label="msb_DistributionsPaidAndDeclared" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_DistributionsPaidAndDeclared" xlink:to="msb_DistributionsPaidAndDeclared_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_DistributionsPaidAndDeclared_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> The aggregate amount of distributions paid and declared in the period. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_DistributionsPaidAndDeclared_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Distributions Paid and Declared </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="msb_DistributionsPaidAndDeclared_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Distributions declared </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_FourthQuarterlyDistributionDeclaredOrPaidPerUnit" xlink:label="msb_FourthQuarterlyDistributionDeclaredOrPaidPerUnit" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_FourthQuarterlyDistributionDeclaredOrPaidPerUnit" xlink:to="msb_FourthQuarterlyDistributionDeclaredOrPaidPerUnit_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_FourthQuarterlyDistributionDeclaredOrPaidPerUnit_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Amount per unit declared or paid out as the fourth quarterly distribution for the reporting period. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_FourthQuarterlyDistributionDeclaredOrPaidPerUnit_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Fourth Quarterly Distribution Declared Or Paid Per Unit </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_FourthQuarterlyDistributionDeclaredOrPaidPerUnit_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Distribution declared per unit </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerBasisOfPricingAxis" xlink:label="us-gaap_ContractWithCustomerBasisOfPricingAxis" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerBasisOfPricingAxis" xlink:to="us-gaap_ContractWithCustomerBasisOfPricingAxis_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractWithCustomerBasisOfPricingAxis_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Contract with Customer, Basis of Pricing [Axis] </label>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain" xlink:label="us-gaap_ContractWithCustomerBasisOfPricingDomain" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContractWithCustomerBasisOfPricingDomain" xlink:to="us-gaap_ContractWithCustomerBasisOfPricingDomain_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContractWithCustomerBasisOfPricingDomain_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Contract With Customer Basis Of Pricing [Domain] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ContractWithCustomerBasisOfPricingDomain_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Contract with Customer, Basis of Pricing [Domain] </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RoyaltiesBasedOnProductShippedBaseAmountMember" xlink:label="msb_RoyaltiesBasedOnProductShippedBaseAmountMember" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RoyaltiesBasedOnProductShippedBaseAmountMember" xlink:to="msb_RoyaltiesBasedOnProductShippedBaseAmountMember_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RoyaltiesBasedOnProductShippedBaseAmountMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Information pertaining to royalty revenue based on the volume and selling price of product shipped, during the period, from properties owned by the entity. This amount includes variable consideration, as the transaction price is based on a percentage that reflects the total cumulative product shipped for the calendar year. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RoyaltiesBasedOnProductShippedBaseAmountMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Royalties Based On Product Shipped Base Amount [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RoyaltiesBasedOnProductShippedBaseAmountMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Base Overriding Royalties </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RoyaltiesBasedOnProductShippedBonusAmountMember" xlink:label="msb_RoyaltiesBasedOnProductShippedBonusAmountMember" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RoyaltiesBasedOnProductShippedBonusAmountMember" xlink:to="msb_RoyaltiesBasedOnProductShippedBonusAmountMember_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RoyaltiesBasedOnProductShippedBonusAmountMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Information pertaining to royalty bonus revenue earned. The royalty bonus is based on the actual shipments of the fiscal quarter at the actual royalty percentage for those shipments and based on the estimated prices for iron ore products sold. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RoyaltiesBasedOnProductShippedBonusAmountMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Royalties Based On Product Shipped Bonus Amount [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RoyaltiesBasedOnProductShippedBonusAmountMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Bonus Royalties </label>
<loc xlink:type="locator" xlink:href="msb-20200430.xsd#msb_RoyaltiesBasedOnRawMaterialsMinedMember" xlink:label="msb_RoyaltiesBasedOnRawMaterialsMinedMember" xmlns="http://www.xbrl.org/2003/linkbase"/>
<labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="msb_RoyaltiesBasedOnRawMaterialsMinedMember" xlink:to="msb_RoyaltiesBasedOnRawMaterialsMinedMember_lbl" xmlns="http://www.xbrl.org/2003/linkbase"/>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="msb_RoyaltiesBasedOnRawMaterialsMinedMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Information pertaining to the fee royalty on crude ore, which is based on an agreed price per ton, subject to certain indexing. </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="msb_RoyaltiesBasedOnRawMaterialsMinedMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Royalties Based On Raw Materials Mined [Member] </label>
<label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="msb_RoyaltiesBasedOnRawMaterialsMinedMember_lbl" xml:lang="en-US" xmlns="http://www.xbrl.org/2003/linkbase"> Fee Royalties </label>
</link:labelLink>
</link:linkbase>

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