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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 24, 2026
Jun. 30, 2025
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Fiscal Year Focus 2025    
Document Transition Report false    
Securities Act File Number 001-39918    
Entity Registrant Name PERPETUA RESOURCES CORP.    
Entity Incorporation, State or Country Code CA    
Entity Tax Identification Number 98-1040943    
Entity Address, Address Line One 405 S. 8th Street    
Entity Address, Address Line Two Ste 201    
Entity Address, State or Province ID    
Entity Address, City or Town Boise    
Entity Address, Postal Zip Code 83702    
City Area Code 208    
Local Phone Number 901-3060    
Title of 12(b) Security Common Shares, without par value    
Trading Symbol PPTA    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 868,313,051
Entity Common Stock, Shares Outstanding   124,949,691  
Documents Incorporated by Reference [Text Block]

Portions of the registrant’s Definitive Proxy Statement relating to the 2026 Annual Meeting of Shareholders, to be filed within 120 days of the Registrant’s fiscal year ended December 31, 2025, are incorporated by reference into Part III of this Annual Report on Form 10-K.

    
Entity Central Index Key 0001526243    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Firm ID 238    
Auditor Location Denver, Colorado