<SEC-DOCUMENT>0001104659-26-001876.txt : 20260107
<SEC-HEADER>0001104659-26-001876.hdr.sgml : 20260107
<ACCEPTANCE-DATETIME>20260107200441
ACCESSION NUMBER:		0001104659-26-001876
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20260105
FILED AS OF DATE:		20260107
DATE AS OF CHANGE:		20260107

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Malmen Jeffrey L
		CENTRAL INDEX KEY:			0001445756
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39918
		FILM NUMBER:		26517062

	MAIL ADDRESS:	
		STREET 1:		1221 WEST IDAHO STREET
		CITY:			BOISE
		STATE:			ID
		ZIP:			83702

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PERPETUA RESOURCES CORP.
		CENTRAL INDEX KEY:			0001526243
		STANDARD INDUSTRIAL CLASSIFICATION:	GOLD & SILVER ORES [1040]
		ORGANIZATION NAME:           	01 Energy & Transportation
		EIN:				000000000
		STATE OF INCORPORATION:			A1
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		405 S. 8TH STREET
		CITY:			BOISE
		STATE:			ID
		ZIP:			83702
		BUSINESS PHONE:		208-901-3060

	MAIL ADDRESS:	
		STREET 1:		405 S. 8TH STREET
		CITY:			BOISE
		STATE:			ID
		ZIP:			83702

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MIDAS GOLD CORP.
		DATE OF NAME CHANGE:	20110720
</SEC-HEADER>
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<TYPE>4
<SEQUENCE>1
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<DESCRIPTION>OWNERSHIP DOCUMENT
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    <periodOfReport>2026-01-05</periodOfReport>

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    <issuer>
        <issuerCik>0001526243</issuerCik>
        <issuerName>PERPETUA RESOURCES CORP.</issuerName>
        <issuerTradingSymbol>PPTA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001445756</rptOwnerCik>
            <rptOwnerName>Malmen Jeffrey L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>405 S. 8TH STREET, STE 201</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOISE</rptOwnerCity>
            <rptOwnerState>ID</rptOwnerState>
            <rptOwnerZipCode>83702</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
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    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
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            </transactionDate>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>20000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>8.59</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>29500</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        <nonDerivativeTransaction>
            <securityTitle>
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            <transactionDate>
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            <transactionTimeliness></transactionTimeliness>
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                    <value>10181</value>
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                <transactionPricePerShare>
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                    <footnoteId id="F2"/>
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                <transactionAcquiredDisposedCode>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
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            <transactionDate>
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        </nonDerivativeTransaction>
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    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Director and Employee Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>8.59</value>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2026-01-05</value>
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                <transactionFormType>4</transactionFormType>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>20000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <value>2026-01-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
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                <value>Director and Employee Stock Option (right to buy)</value>
            </securityTitle>
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                <footnoteId id="F1"/>
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            <transactionDate>
                <value>2026-01-05</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>9500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <value>2026-01-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9500</value>
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                <sharesOwnedFollowingTransaction>
                    <value>0</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeTransaction>
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    <footnotes>
        <footnote id="F1">The exercise price of the stock option of CAD $11.80 is converted to USD based on the daily average exchange rate as reported by the H.10 statistical release of the Board of Governances of the Federal Reserve System on January 2, 2026, of C$1.3738 = US$1.00.</footnote>
        <footnote id="F2">The sale price of the stock option of CAD $36.18 is converted to USD based on the daily average exchange rate as reported by the H.10 statistical release of the Board of Governances of the Federal Reserve System on January 2, 2026, of C$1.3738 = US$1.00. The sale price of CAD $36.18 is a weighted average
price. These shares were sold in multiple transactions at prices ranging from CAD $36.05 to CAD $36.31, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of
Common Shares sold at each separate price within the range set forth in this footnote (2). These shares represent shares sold to cover option exercise price.</footnote>
        <footnote id="F3">The sale price of the stock option of CAD $36.50 is converted to USD based on the daily average exchange rate as reported by the H.10 statistical release of the Board of Governances of the Federal Reserve System on January 2, 2026, of C$1.3738 = US$1.00. The sale price of CAD $36.50 is a weighted average price. These shares were sold in multiple transactions at prices ranging from CAD $36.41 to CAD $36.71, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of
Common Shares sold at each separate price within the range set forth in this footnote (3). These shares represent shares sold to cover payment of taxes relating to the option exercise.</footnote>
        <footnote id="F4">The stock option, representing a right to purchase a total of 20,000 Common Shares, became exercisable as to 5,000 Common Shares on January 20, 2021, as to 5,000 Common Shares on January 20, 2022, as to 5,000 Common Shares on January 20, 2023, and as to the remaining 5,000 on January 20, 2024.</footnote>
        <footnote id="F5">The stock option, representing a right to purchase a total of 9,500 Common Shares, became exercisable as to 2,375 Common Shares on January 20, 2021, as to 2,375 Common Shares on January 20, 2022, as to 2,375 Common Shares on January 20, 2023, and as to the remaining 2,375 on January 20, 2024.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Tanya Nelson, as attorney-in-fact for Jeffrey L Malmen</signatureName>
        <signatureDate>2026-01-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
