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Document And Entity Information
 12 Months Ended
Dec. 31, 2022
Document And Entity Information  
Entity Registrant Name Denison Mines Corp.
Entity Central Index Key 0001063259
Document Type 6-K
Amendment Flag false
Current Fiscal Year End Date --12-31
Document Period End Date Dec. 31, 2022
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2022
Entity File Number 001-33414
Entity Address Address Line 1 1100-40 University Avenue
Entity Address City Or Town Toronto
Entity Address State Or Province ON
Entity Address Postal Zip Code M5J 1T1