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Document And Entity Information
 12 Months Ended
Dec. 31, 2024
shares
Document Information [Line Items]  
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2024
Securities Act File Number 001-33414
Entity Registrant Name DENISON MINES CORP.
Entity Incorporation, State or Country Code A6
Entity Primary SIC Number 1090
Entity Tax Identification Number 98-0622284
Entity Address, Address Line One 1100 – 40 University Avenue
Entity Address, City or Town Toronto
Entity Address, State or Province ON
Entity Address, Postal Zip Code M5J 1T1
Entity Address, Country CA
City Area Code 416
Local Phone Number 979-1991
Title of 12(b) Security Common Shares
Trading Symbol DNN
Security Exchange Name NYSEAMER
Annual Information Form true
Audited Annual Financial Statements true
Entity Common Stock, Shares Outstanding 895,713,101
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Auditor Name KPMG LLP
Auditor Firm ID 85
Auditor Location Toronto, ON, Canada
Entity Central Index Key 0001063259
Amendment Flag false
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2024
Document Fiscal Period Focus FY
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One 28 Liberty Street
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10005
City Area Code 212
Local Phone Number 894-8940
Contact Personnel Name C T Corporation System