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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 X FORM 40 - F Registration statement pursuant to Section 12 of the Securities Exchange Act of 1934 or Annual report pursuant to Section 13 ( a ) or 15 ( d ) of the Securities Exchange Act of 1934 For the fiscal year ended December 31 , 2020 British Columbia , Canada ( Province or other jurisdiction of incorporation or organization ) PERPETUA RESOURCES CORP . ( Exact name of Registrant as specified in its charter ) 1040 ( Primary Standard Industrial Classification Code Number ) 405 S. 8th Street , Ste 201 , Boise , Idaho 83702 ( 208 ) 901-3060 Commission File Number 1-39918 26-4675940 ( I.R.S. Employer Identification Number ) ( Address and telephone number of Registrant's principal executive offices ) Perpetua Resources Idaho Inc. , 13181 Highway 55 , PO Box 429 , Donnelly , Idaho 83615 ( 208 ) 901-3060 ( Name , address ( including zip code ) and telephone number ( including area code ) of agent for service in the United States ) Securities registered or to be registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Shares , no par value Trading Symbol ( s ) . PPTA Name of each exchange on which registered Nasdaq Stock Market LLC Securities registered or to be registered pursuant to Section 12 ( g ) of the Act : Securities for which there is a reporting obligation pursuant to Section 15 ( d ) of the Act : For annual reports , indicate by check mark the information filed with this Form : x Annual information form x Audited annual financial statements Indicate the number of outstanding shares of each of the issuer's classes of capital or common stock as of the close of the period covered by the annual report : 47,481,134 Indicate by check mark whether the Registrant : ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Exchange Act during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) ; and ( 2 ) has been subject to such filing requirements for the past 90 days.x Yes " No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the Registrant was required to submit such files ) . x Yes No Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 12b - 2 of the Exchange Act . Emerging growth company x If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards † provided pursuant to Section 13 ( a ) of the Exchange Act.¨