    <SEC-DOCUMENT>0001654954-21-003407-index.html : 20210329
    <SEC-HEADER>0001654954-21-003407.hdr.sgml : 20210329
    <ACCEPTANCE-DATETIME>20210329160624
    ACCESSION NUMBER:		0001654954-21-003407
    CONFORMED SUBMISSION TYPE:	40-F
    PUBLIC DOCUMENT COUNT:		60
    CONFORMED PERIOD OF REPORT:	20201231
    FILED AS OF DATE:		20210329
    DATE AS OF CHANGE:		20210329

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			DENISON MINES CORP.
    		CENTRAL INDEX KEY:			0001063259
    		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS METAL ORES [1090]
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			A6
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		40-F
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33414
    		FILM NUMBER:		21781758

    	BUSINESS ADDRESS:
    		STREET 1:		40 UNIVERSITY AVE., SUITE 1100
    		CITY:			TORONTO
    		STATE:			A6
    		ZIP:			M5J 1T1
    		BUSINESS PHONE:		(416) 979-1991

    	MAIL ADDRESS:
    		STREET 1:		40 UNIVERSITY AVE., SUITE 1100
    		CITY:			TORONTO
    		STATE:			A6
    		ZIP:			M5J 1T1

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	INTERNATIONAL URANIUM CORP
    		DATE OF NAME CHANGE:	19980603
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>40-F
    <SEQUENCE>1
    <FILENAME>denison-form40fye2020vfin.htm
    <DESCRIPTION>ANNUAL REPORT ON FORM 40-F DATED MARCH 29, 2021
    <TEXT>
    Document 1 - file: denison-form40fye2020vfin.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>denison-aiff2020vfinal.htm
    <DESCRIPTION>ANNUAL INFORMATION FORM FOR THE YEAR ENDED DECEMBER 31, 2020
    <TEXT>
    Document 2 - file: denison-aiff2020vfinal.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.4
    <SEQUENCE>3
    <FILENAME>ex994consentkpmg.htm
    <DESCRIPTION>CONSENT OF KPMG LLP
    <TEXT>
    Document 3 - file: ex994consentkpmg.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.5
    <SEQUENCE>4
    <FILENAME>ex995consentpwc.htm
    <DESCRIPTION>CONSENT OF PRICEWATERHOUSECOOPERS LLP
    <TEXT>
    Document 4 - file: ex995consentpwc.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.6
    <SEQUENCE>5
    <FILENAME>ex996form40-fceoandcfocer.htm
    <DESCRIPTION>OFFICERS' CERTIFICATIONS REQUIRED BY RULE 13A-14(A) OR RULE 15D-14(A) OF THE SECURITIES EXCHANGE ACT OF 1934
    <TEXT>
    Document 5 - file: ex996form40-fceoandcfocer.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.7
    <SEQUENCE>6
    <FILENAME>ex99form40-fceoandcfocert.htm
    <DESCRIPTION>OFFICERS' CERTIFICATIONS REQUIRED BY RULE 13A-14(B) OR RULE 15D-14(B) AND SECTION 1350 OF CHAPTER 63 OF TITLE 18 OF THE UNITED STATES CODE
    <TEXT>
    Document 6 - file: ex99form40-fceoandcfocert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.8
    <SEQUENCE>7
    <FILENAME>ex998consentslr.htm
    <DESCRIPTION>CONSENT OF SLR CONSULTING (CANADA) LTD. (FORMERLY ROSCOE POSTLE ASSOCIATES INC.)
    <TEXT>
    Document 7 - file: ex998consentslr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.9
    <SEQUENCE>8
    <FILENAME>ex999consentroutledge.htm
    <DESCRIPTION>CONSENT OF RICHARD E. ROUTLEDGE, M. SC., P.GEO.
    <TEXT>
    Document 8 - file: ex999consentroutledge.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.10
    <SEQUENCE>9
    <FILENAME>ex9910consentmathisen.htm
    <DESCRIPTION>CONSENT OF MARK MATHISEN, P.GEO.
    <TEXT>
    Document 9 - file: ex9910consentmathisen.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.11
    <SEQUENCE>10
    <FILENAME>ex9911consentroscoe.htm
    <DESCRIPTION>CONSENT OF WILLIAM E. ROSCOE, PH.D., P.ENG.
    <TEXT>
    Document 10 - file: ex9911consentroscoe.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.12
    <SEQUENCE>11
    <FILENAME>ex9912consentsrk.htm
    <DESCRIPTION>CONSENT OF SRK CONSULTING (CANADA) INC.
    <TEXT>
    Document 11 - file: ex9912consentsrk.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.13
    <SEQUENCE>12
    <FILENAME>ex9913consentliskowich.htm
    <DESCRIPTION>CONSENT OF MARK LISKOWICH, P.GEO.
    <TEXT>
    Document 12 - file: ex9913consentliskowich.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.14
    <SEQUENCE>13
    <FILENAME>ex9914consentleuangthong.htm
    <DESCRIPTION>CONSENT OF OY LEUANGTHONG, P.ENG.
    <TEXT>
    Document 13 - file: ex9914consentleuangthong.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.15
    <SEQUENCE>14
    <FILENAME>ex9915consentrevering.htm
    <DESCRIPTION>CONSENT OF CLIFF REVERING, P.ENG.
    <TEXT>
    Document 14 - file: ex9915consentrevering.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.16
    <SEQUENCE>15
    <FILENAME>ex9916consent11257579cana.htm
    <DESCRIPTION>CONSENT OF 11257579 CANADA LTD.
    <TEXT>
    Document 15 - file: ex9916consent11257579cana.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.17
    <SEQUENCE>16
    <FILENAME>ex9917consentkeller.htm
    <DESCRIPTION>CONSENT OF G. DAVID KELLER, P.GEO.
    <TEXT>
    Document 16 - file: ex9917consentkeller.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.18
    <SEQUENCE>17
    <FILENAME>ex9918consentsgscanada.htm
    <DESCRIPTION>CONSENT OF SGS CANADA INC.
    <TEXT>
    Document 17 - file: ex9918consentsgscanada.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.19
    <SEQUENCE>18
    <FILENAME>ex9919consentarmitage.htm
    <DESCRIPTION>CONSENT OF ALLAN ARMITAGE, PH.D., P.GEO.
    <TEXT>
    Document 18 - file: ex9919consentarmitage.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.20
    <SEQUENCE>19
    <FILENAME>ex9920consentgeovector.htm
    <DESCRIPTION>CONSENT OF GEOVECTOR MANAGEMENT INC.
    <TEXT>
    Document 19 - file: ex9920consentgeovector.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.21
    <SEQUENCE>20
    <FILENAME>ex9921consentsexton.htm
    <DESCRIPTION>CONSENT OF ALAN SEXTON, M.SC., P.GEO.
    <TEXT>
    Document 20 - file: ex9921consentsexton.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.22
    <SEQUENCE>21
    <FILENAME>ex9922consentverran.htm
    <DESCRIPTION>CONSENT OF DALE VERRAN, M.SC., P.GEO, PR.SCI.NAT.
    <TEXT>
    Document 21 - file: ex9922consentverran.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.23
    <SEQUENCE>22
    <FILENAME>ex9923consentsorba.htm
    <DESCRIPTION>CONSENT OF CHAD SORBA, P.GEO.
    <TEXT>
    Document 22 - file: ex9923consentsorba.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.24
    <SEQUENCE>23
    <FILENAME>ex9924consent-bennettec.htm
    <DESCRIPTION>CONSENT OF BENNETT ENVIRONMENTAL CONSULTING
    <TEXT>
    Document 23 - file: ex9924consent-bennettec.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.25
    <SEQUENCE>24
    <FILENAME>ex9925consent-bennett.htm
    <DESCRIPTION>CONSENT OF PAMELA BENNETT, M.SC.
    <TEXT>
    Document 24 - file: ex9925consent-bennett.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.26
    <SEQUENCE>25
    <FILENAME>ex9926consent-cancost.htm
    <DESCRIPTION>CONSENT OF CANCOST CONSULTING INC.
    <TEXT>
    Document 25 - file: ex9926consent-cancost.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.27
    <SEQUENCE>26
    <FILENAME>ex9927consent-wilkie.htm
    <DESCRIPTION>CONSENT OF GEOFF WILKIE, P.ENG.
    <TEXT>
    Document 26 - file: ex9927consent-wilkie.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.28
    <SEQUENCE>27
    <FILENAME>ex9928consentengcomp.htm
    <DESCRIPTION>CONSENT OF ENGCOMP ENGINEERING AND COMPUTING PROFESSIONALS INC.
    <TEXT>
    Document 27 - file: ex9928consentengcomp.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.29
    <SEQUENCE>28
    <FILENAME>ex9929consentgraham.htm
    <DESCRIPTION>CONSENT OF GORDON GRAHAM, P.ENG.
    <TEXT>
    Document 28 - file: ex9929consentgraham.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.30
    <SEQUENCE>29
    <FILENAME>ex9930consentpetrotek.htm
    <DESCRIPTION>CONSENT OF PETROTEK CORPORATION
    <TEXT>
    Document 29 - file: ex9930consentpetrotek.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.31
    <SEQUENCE>30
    <FILENAME>ex9931consentlawrence.htm
    <DESCRIPTION>CONSENT OF ERROL LAWRENCE, P.GEO.
    <TEXT>
    Document 30 - file: ex9931consentlawrence.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.32
    <SEQUENCE>31
    <FILENAME>ex9932consentceemc.htm
    <DESCRIPTION>CONSENT OF CHUCK EDWARDS EXTRACTIVE METALLURGY CONSULTING
    <TEXT>
    Document 31 - file: ex9932consentceemc.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.33
    <SEQUENCE>32
    <FILENAME>ex9933consentedwards.htm
    <DESCRIPTION>CONSENT OF CHUCK EDWARDS, P.ENG.
    <TEXT>
    Document 32 - file: ex9933consentedwards.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.34
    <SEQUENCE>33
    <FILENAME>ex9934consentldsaltd.htm
    <DESCRIPTION>CONSENT OF LAWRENCE, DEVON, SMITH & ASSOCIATES LTD.
    <TEXT>
    Document 33 - file: ex9934consentldsaltd.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.35
    <SEQUENCE>34
    <FILENAME>ex9935consentsmith.htm
    <DESCRIPTION>CONSENT OF LAWRENCE SMITH, P.ENG.
    <TEXT>
    Document 34 - file: ex9935consentsmith.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>35
    <FILENAME>denison-aiff2020vfinal000.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 35 - file: denison-aiff2020vfinal000.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>36
    <FILENAME>denison-aiff2020vfinal001.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 36 - file: denison-aiff2020vfinal001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>37
    <FILENAME>denison-aiff2020vfinal002.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 37 - file: denison-aiff2020vfinal002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>38
    <FILENAME>denison-aiff2020vfinal003.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 38 - file: denison-aiff2020vfinal003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>39
    <FILENAME>denison-aiff2020vfinal004.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 39 - file: denison-aiff2020vfinal004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>40
    <FILENAME>denison-aiff2020vfinal005.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 40 - file: denison-aiff2020vfinal005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>41
    <FILENAME>denison-aiff2020vfinal006.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 41 - file: denison-aiff2020vfinal006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>42
    <FILENAME>denison-aiff2020vfinal007.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 42 - file: denison-aiff2020vfinal007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>43
    <FILENAME>denison-aiff2020vfinal008.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 43 - file: denison-aiff2020vfinal008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>44
    <FILENAME>denison-aiff2020vfinal009.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 44 - file: denison-aiff2020vfinal009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>45
    <FILENAME>denison-aiff2020vfinal010.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 45 - file: denison-aiff2020vfinal010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>46
    <FILENAME>denison-aiff2020vfinal011.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 46 - file: denison-aiff2020vfinal011.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>47
    <FILENAME>denison-aiff2020vfinal012.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 47 - file: denison-aiff2020vfinal012.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>48
    <FILENAME>denison-aiff2020vfinal013.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 48 - file: denison-aiff2020vfinal013.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>49
    <FILENAME>denison-aiff2020vfinal014.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 49 - file: denison-aiff2020vfinal014.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>50
    <FILENAME>denison-aiff2020vfinal015.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 50 - file: denison-aiff2020vfinal015.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>51
    <FILENAME>denison-aiff2020vfinal016.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 51 - file: denison-aiff2020vfinal016.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>52
    <FILENAME>denison-aiff2020vfinal017.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 52 - file: denison-aiff2020vfinal017.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>53
    <FILENAME>denison-aiff2020vfinal018.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 53 - file: denison-aiff2020vfinal018.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>54
    <FILENAME>denison-aiff2020vfinal019.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 54 - file: denison-aiff2020vfinal019.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>55
    <FILENAME>ex9912consentsrk000.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 55 - file: ex9912consentsrk000.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>56
    <FILENAME>ex9916consent11257579cana000.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 56 - file: ex9916consent11257579cana000.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>57
    <FILENAME>ex995consentpwc000.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 57 - file: ex995consentpwc000.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>58
    <FILENAME>ex995consentpwc001.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 58 - file: ex995consentpwc001.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>59
    <FILENAME>ex998image.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 59 - file: ex998image.jpg

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    <SEQUENCE>60
    <FILENAME>index.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 60 - file: index.jpg

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