<SEC-DOCUMENT>0001164508-25-000010.txt : 20251113
<SEC-HEADER>0001164508-25-000010.hdr.sgml : 20251113
<ACCEPTANCE-DATETIME>20251113172217
ACCESSION NUMBER:		0001164508-25-000010
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20251113
DATE AS OF CHANGE:		20251113

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FORTUNA MINING CORP.
		CENTRAL INDEX KEY:			0001341335
		STANDARD INDUSTRIAL CLASSIFICATION:	GOLD & SILVER ORES [1040]
		ORGANIZATION NAME:           	01 Energy & Transportation
		EIN:				000000000
		STATE OF INCORPORATION:			A1
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-84549
		FILM NUMBER:		251479830

	BUSINESS ADDRESS:	
		ADDRESS IS A NON US LOCATION: 	YES
		STREET 1:		1111 MELVILLE STREET, SUITE 820
		CITY:			VANCOUVER
		PROVINCE COUNTRY:   	A1
		ZIP:			V6E 3V6
		BUSINESS PHONE:		604-484-4085

	MAIL ADDRESS:	
		ADDRESS IS A NON US LOCATION: 	YES
		STREET 1:		1111 MELVILLE STREET, SUITE 820
		CITY:			VANCOUVER
		PROVINCE COUNTRY:   	A1
		ZIP:			V6E 3V6

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FORTUNA SILVER MINES INC
		DATE OF NAME CHANGE:	20051013

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
		CENTRAL INDEX KEY:			0001164508
		ORGANIZATION NAME:           	
		EIN:				043472863
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G

	BUSINESS ADDRESS:	
		STREET 1:		200 CLARENDON STREET, 30TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		617-919-0000

	MAIL ADDRESS:	
		STREET 1:		200 CLARENDON STREET, 30TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ARROWSTREET CAPITAL LIMITED PARTNERSHIP
		DATE OF NAME CHANGE:	20020107
</SEC-HEADER>
<DOCUMENT>
<TYPE>SCHEDULE 13G
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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    <submissionType>SCHEDULE 13G</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001164508</cik>
          <ccc>XXXXXXXX</ccc>
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      <liveTestFlag>LIVE</liveTestFlag>



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  </headerData>
  <formData>
    <coverPageHeader>
      <securitiesClassTitle>Common Shares</securitiesClassTitle>
      <eventDateRequiresFilingThisStatement>09/30/2025</eventDateRequiresFilingThisStatement>
      <issuerInfo>
        <issuerCik>0001341335</issuerCik>
        <issuerName>FORTUNA MINING CORP.</issuerName>
        <issuerCusip>349942102</issuerCusip>
        <issuerPrincipalExecutiveOfficeAddress>
          <com:street1>1111 MELVILLE STREET, SUITE 820</com:street1>
          <com:city>VANCOUVER</com:city>
          <com:stateOrCountry>A1</com:stateOrCountry>
          <com:zipCode>V6E 3V6</com:zipCode>
        </issuerPrincipalExecutiveOfficeAddress>
      </issuerInfo>
      <designateRulesPursuantThisScheduleFiled>
        <designateRulePursuantThisScheduleFiled>Rule 13d-1(b)</designateRulePursuantThisScheduleFiled>
      </designateRulesPursuantThisScheduleFiled>
    </coverPageHeader>
    <coverPageHeaderReportingPersonDetails>

      <reportingPersonName>ARROWSTREET CAPITAL, LIMITED PARTNERSHIP</reportingPersonName>
      <citizenshipOrOrganization>MA</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>16112823.00</soleVotingPower>
        <sharedVotingPower>0.00</sharedVotingPower>
        <soleDispositivePower>19677691.00</soleDispositivePower>
        <sharedDispositivePower>0.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>19677691.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <classPercent>6.4</classPercent>
      <typeOfReportingPerson>IA</typeOfReportingPerson>
    </coverPageHeaderReportingPersonDetails>
    <coverPageHeaderReportingPersonDetails>

      <reportingPersonName>ARROWSTREET CAPITAL HOLDING LLC</reportingPersonName>
      <citizenshipOrOrganization>DE</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>16112823.00</soleVotingPower>
        <sharedVotingPower>0.00</sharedVotingPower>
        <soleDispositivePower>19677691.00</soleDispositivePower>
        <sharedDispositivePower>0.00</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>19677691.00</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <classPercent>6.4</classPercent>
      <typeOfReportingPerson>HC</typeOfReportingPerson>
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    <items>
      <item1>
        <issuerName>FORTUNA MINING CORP.</issuerName>
        <issuerPrincipalExecutiveOfficeAddress>1111 MELVILLE STREET, SUITE 820, VANCOUVER, BRITISH COLUMBIA, CANADA, V6E 3V6.</issuerPrincipalExecutiveOfficeAddress>
      </item1>
      <item2>
        <filingPersonName>Arrowstreet Capital, Limited Partnership ("ASC")

Arrowstreet Capital Holding LLC ("ACH")</filingPersonName>
        <principalBusinessOfficeOrResidenceAddress>200 Clarendon Street, 30th Floor
Boston, MA 02116</principalBusinessOfficeOrResidenceAddress>
        <citizenship>ASC: Massachusetts
ACH: Delaware </citizenship>
      </item2>
      <item3>
        <notApplicableFlag>N</notApplicableFlag>
        <typeOfPersonFiling>IA</typeOfPersonFiling>
        <typeOfPersonFiling>HC</typeOfPersonFiling>
      </item3>
      <item4>
        <amountBeneficiallyOwned>19,677,691</amountBeneficiallyOwned>
        <classPercent>ASC: 6.4%
ACH: 6.4%</classPercent>
        <numberOfSharesPersonHas>
          <solePowerOrDirectToVote>16,112,823</solePowerOrDirectToVote>
          <sharedPowerOrDirectToVote>0</sharedPowerOrDirectToVote>
          <solePowerOrDirectToDispose>19,677,691</solePowerOrDirectToDispose>
          <sharedPowerOrDirectToDispose>0</sharedPowerOrDirectToDispose>
        </numberOfSharesPersonHas>
      </item4>
      <item5>
        <notApplicableFlag>Y</notApplicableFlag>
        <classOwnership5PercentOrLess>N</classOwnership5PercentOrLess>
      </item5>
      <item6>
        <notApplicableFlag>N</notApplicableFlag>
        <ownershipMoreThan5PercentOnBehalfOfAnotherPerson>This Schedule is filed by ASC, in its capacity as investment adviser to a number of its investment advisory clients, and by ACH, in its capacity as the ultimate parent company of ASC.  The securities to which this Schedule relates are held by investment advisory clients of ASC.  No such investment advisory client of ASC is known by ASC or by ACH to hold more than five percent of the class of securities to which this Schedule relates.</ownershipMoreThan5PercentOnBehalfOfAnotherPerson>
      </item6>
      <item7>
        <notApplicableFlag>Y</notApplicableFlag>
      </item7>
      <item8>
        <notApplicableFlag>Y</notApplicableFlag>
      </item8>
      <item9>
        <notApplicableFlag>Y</notApplicableFlag>
      </item9>
      <item10>
        <notApplicableFlag>N</notApplicableFlag>
        <certifications>By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under &amp;#167; 240.14a-11.

</certifications>
      </item10>
    </items>
    <signatureInformation>
      <reportingPersonName>ARROWSTREET CAPITAL, LIMITED PARTNERSHIP</reportingPersonName>
      <signatureDetails>
        <signature>Kimberly Kelley</signature>
        <title>Chief Compliance Officer</title>
        <date>11/13/2025</date>
      </signatureDetails>
    </signatureInformation>
    <signatureInformation>
      <reportingPersonName>ARROWSTREET CAPITAL HOLDING LLC</reportingPersonName>
      <signatureDetails>
        <signature>Eric Burnett</signature>
        <title>Member and Authorized Signatory</title>
        <date>11/13/2025</date>
      </signatureDetails>
    </signatureInformation>
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</DOCUMENT>
</SEC-DOCUMENT>
