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Document And Entity Information
 12 Months Ended
Dec. 31, 2024
shares
Document Information [Line Items]  
Entity Registrant Name FORTUNA MINING CORP.
Entity Central Index Key 0001341335
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Amendment Flag false
Document Period End Date Dec. 31, 2024
Securities Act File Number 001-35297
Entity Incorporation, State or Country Code Z4
Entity Primary SIC Number 1040
Entity Tax Identification Number 00-0000000
Entity Address, Address Line One 1111 Melville Street
Entity Address, Address Line Two Suite 820
Entity Address, City or Town Vancouver
Entity Address, State or Province BC
Entity Address, Postal Zip Code V6E 3V6
Entity Address, Country CA
City Area Code 604
Local Phone Number 484-4085
Title of 12(b) Security Common Shares
Trading Symbol FSM
Security Exchange Name NYSE
Annual Information Form true
Audited Annual Financial Statements true
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2024
Current Fiscal Year End Date --12-31
Entity Interactive Data Current Yes
Entity Current Reporting Status Yes
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Entity Common Stock, Shares Outstanding 306,587,630
Auditor Name KPMG LLP
Auditor Firm ID 85
Auditor Location Vancouver, Canada
Document Financial Statement Error Correction [Flag] false
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One 850 Library Ave
Entity Address, Address Line Two Suite 204
Entity Address, City or Town Newark
Entity Address, State or Province DE
Entity Address, Postal Zip Code 19711
City Area Code 302
Local Phone Number 738-6680
Contact Personnel Name Puglisi & Associates