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Document And Entity Information
 12 Months Ended
Dec. 31, 2023
shares
Document Information [Line Items]  
Entity Registrant Name FORTUNA SILVER MINES INC
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, 2023
Entity 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 200 Burrard Street
Entity Address, Address Line Two Suite 650
Entity Address, City or Town Vancouver
Entity Address, State or Province BC
Entity Address, Postal Zip Code V6C 3L6
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 2023
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  
Document Information [Line Items]  
Entity Address, Address Line One 10 East 40th Street
Entity Address, Address Line Two 10th Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10016
City Area Code 212
Local Phone Number 947-7200
Contact Personnel Name National Corporate Research, Ltd.