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Cover
 12 Months Ended
Dec. 31, 2021
shares
Cover [Abstract]  
Entity Registrant Name DENISON MINES CORP.
Entity Central Index Key 0001063259
Document Type 40-F
Amendment Flag false
Current Fiscal Year End Date --12-31
Entity Emerging Growth Company false
Entity Current Reporting Status Yes
Document Period End Date Dec. 31, 2021
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2021
Entity Common Stock Shares Outstanding 812,429,995
Document Annual Report true
Entity File Number 001-33414
Entity Incorporation State Country Code A6
Entity Tax Identification Number 98-0622284
Entity Address Address Line 1 1100 – 40 University Avenue
Entity Address City Or Town Toronto
Entity Address State Or Province ON
Entity Address Country CA
Entity Address Postal Zip Code M5J 1T1
City Area Code 416
Icfr Auditor Attestation Flag true
Auditor Name KPMG LLP
Auditor Location Toronto, ON
Auditor Firm Id 85
Local Phone Number 979-1991
Entity Interactive Data Current Yes
Document Registration Statement false
Annual Information Form true
Audited Annual Financial Statements false