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.6
 
 
CERTIFICATION PURSUANT TO
 
 
18 U.S.C. SECTION 1350
 
 
In connection with the Annual Report of Denison Mines Corp. (the “Company”) on Form 40-F for the period ended December 31, 2019, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned certifies, pursuant to 18 U.S.C. 1350, and SEC Rule 13a-14(b), that to the best of my knowledge:
 
1.
The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
 
2.
The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.
 
 
Date: March 13, 2020
 
By: /s/ David D. Cates                                                       
By: /s/ Gabriel McDonald                                                  
 
 
Name: David D. Cates                                                       
Name: Gabriel McDonald                                                   
 
 
Title: President and Chief Executive Officer                    
Title: Vice President, Finance and Chief Financial Officer