    <SEC-DOCUMENT>0001654954-20-002616-index.html : 20200313
    <SEC-HEADER>0001654954-20-002616.hdr.sgml : 20200313
    <ACCEPTANCE-DATETIME>20200313160615
    ACCESSION NUMBER:		0001654954-20-002616
    CONFORMED SUBMISSION TYPE:	40-F
    PUBLIC DOCUMENT COUNT:		58
    CONFORMED PERIOD OF REPORT:	20191231
    FILED AS OF DATE:		20200313
    DATE AS OF CHANGE:		20200313

    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:		20712669

    	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-form40fye2019vfin.htm
    <DESCRIPTION>FORM 40-F DATED MARCH 13, 2020
    <TEXT>
    Document 1 - file: denison-form40fye2019vfin.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>denison-aiff2019vedgar.htm
    <DESCRIPTION>ANNUAL INFORMATION FORM FOR THE YEAR ENDED DECEMBER 31, 2019
    <TEXT>
    Document 2 - file: denison-aiff2019vedgar.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>a2019-12dmcmdafiling.htm
    <DESCRIPTION>MANAGEMENT'S DISCUSSION AND ANALYSIS FOR THE FINANCIAL YEAR ENDED DECEMBER 31, 2019
    <TEXT>
    Document 3 - file: a2019-12dmcmdafiling.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.3
    <SEQUENCE>4
    <FILENAME>a2019-12dmcfinancialsv5.htm
    <DESCRIPTION>CONSOLIDATED FINANCIAL STATEMENTS FOR THE FINANCIAL YEAR ENDED DECEMBER 31, 2019
    <TEXT>
    Document 4 - file: a2019-12dmcfinancialsv5.htm

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    <DOCUMENT>
    <TYPE>EX-99.4
    <SEQUENCE>5
    <FILENAME>ex99-4auditorconsent.htm
    <DESCRIPTION>CONSENT OF PRICEWATERHOUSECOOPERS LLP
    <TEXT>
    Document 5 - file: ex99-4auditorconsent.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.5
    <SEQUENCE>6
    <FILENAME>officers_certificationsco.htm
    <DESCRIPTION>OFFICER'S CERTIFICATION REQUIRED BY RULE 13A-14(A) OR RULE 15D-14(A) OF THE SECURITIES EXCHANGE ACT OF 1934
    <TEXT>
    Document 6 - file: officers_certificationsco.htm

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    <DOCUMENT>
    <TYPE>EX-99.6
    <SEQUENCE>7
    <FILENAME>officers_certificationsco000.htm
    <DESCRIPTION>OFFICER'S CERTIFICATION 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 7 - file: officers_certificationsco000.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.7
    <SEQUENCE>8
    <FILENAME>ex99-7rpaconsent.htm
    <DESCRIPTION>CONSENT OF ROSCOE POSTLE ASSOCIATES INC.
    <TEXT>
    Document 8 - file: ex99-7rpaconsent.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.8
    <SEQUENCE>9
    <FILENAME>ex99-14routledgeconsent.htm
    <DESCRIPTION>CONSENT OF RICHARD E. ROUTLEDGE, M.SC., P.GEO.
    <TEXT>
    Document 9 - file: ex99-14routledgeconsent.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.9
    <SEQUENCE>10
    <FILENAME>ex99-9srkconsent.htm
    <DESCRIPTION>CONSENT OF SRK CONSULTING (CANADA) INC.
    <TEXT>
    Document 10 - file: ex99-9srkconsent.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.10
    <SEQUENCE>11
    <FILENAME>liskowich.htm
    <DESCRIPTION>CONSENT OF MARK LISKOWICH, P.GEO.
    <TEXT>
    Document 11 - file: liskowich.htm

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    <SEQUENCE>12
    <FILENAME>ex-9916leuangthongconsent.htm
    <DESCRIPTION>CONSENT OF OY LEUANGTHONG, P.ENG.
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    Document 12 - file: ex-9916leuangthongconsent.htm

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    <DOCUMENT>
    <TYPE>EX-99.12
    <SEQUENCE>13
    <FILENAME>ex99-reveringconsent.htm
    <DESCRIPTION>CONSENT OF CLIFF REFERING, P.ENG.
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    Document 13 - file: ex99-reveringconsent.htm

    </DOCUMENT>
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    <TYPE>EX-99.13
    <SEQUENCE>14
    <FILENAME>ex99-gdsekellerconsent.htm
    <DESCRIPTION>CONSENT OF G. DAVID KELLER, P.GEO.
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    Document 14 - file: ex99-gdsekellerconsent.htm

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    <SEQUENCE>15
    <FILENAME>ex99-sgsgeostatconsent.htm
    <DESCRIPTION>CONSENT OF SGS GEOSTAT
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    Document 15 - file: ex99-sgsgeostatconsent.htm

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    <SEQUENCE>16
    <FILENAME>ex99-13armitageconsent.htm
    <DESCRIPTION>CONSENT OF ALLAN ARMITAGE, PH.D., P.GEO.
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    Document 16 - file: ex99-13armitageconsent.htm

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    <SEQUENCE>17
    <FILENAME>ex99-geovectorconsent.htm
    <DESCRIPTION>CONSENT OF GEOVECTOR MANAGEMENT INC.
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    Document 17 - file: ex99-geovectorconsent.htm

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    <SEQUENCE>18
    <FILENAME>ex99-12sextonconsent.htm
    <DESCRIPTION>CONSENT OF ALAN SEXTON, M.SC., P.GEO.
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    Document 18 - file: ex99-12sextonconsent.htm

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    <SEQUENCE>19
    <FILENAME>ex99-17verranconsent.htm
    <DESCRIPTION>CONSENT OF DALE VERRAN, M.SC., P.GEO, PR.SCI.NAT.
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    Document 19 - file: ex99-17verranconsent.htm

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    <SEQUENCE>20
    <FILENAME>ex99-18sorbaconsent.htm
    <DESCRIPTION>CONSENT OF CHAD SORBA, P.GEO.
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    Document 20 - file: ex99-18sorbaconsent.htm

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    <DOCUMENT>
    <TYPE>EX-99.20
    <SEQUENCE>21
    <FILENAME>ex99-donmezconsent.htm
    <DESCRIPTION>CONSENT OF SERDAR DONMEZ, P.GEO., E.I.T.
    <TEXT>
    Document 21 - file: ex99-donmezconsent.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.21
    <SEQUENCE>22
    <FILENAME>ex99-burryconsent.htm
    <DESCRIPTION>CONSENT OF PAUL BURRY, P.GEO.
    <TEXT>
    Document 22 - file: ex99-burryconsent.htm

    </DOCUMENT>
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    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>a2019-12dmcmdafiling000.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 23 - file: a2019-12dmcmdafiling000.jpg

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    <SEQUENCE>24
    <FILENAME>a2019-12dmcmdafiling001.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 24 - file: a2019-12dmcmdafiling001.jpg

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    <SEQUENCE>25
    <FILENAME>a2019-12dmcmdafiling002.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 25 - file: a2019-12dmcmdafiling002.jpg

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    <DOCUMENT>
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    <SEQUENCE>26
    <FILENAME>a2019-12dmcmdafiling003.jpg
    <DESCRIPTION>IMAGE
    <TEXT>
    Document 26 - file: a2019-12dmcmdafiling003.jpg

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    <SEQUENCE>27
    <FILENAME>a2019-12dmcmdafiling004.jpg
    <DESCRIPTION>IMAGE
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    Document 27 - file: a2019-12dmcmdafiling004.jpg

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    <SEQUENCE>28
    <FILENAME>a2019-12dmcmdafiling005.jpg
    <DESCRIPTION>IMAGE
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    Document 28 - file: a2019-12dmcmdafiling005.jpg

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    <SEQUENCE>29
    <FILENAME>a2019-12dmcmdafiling006.jpg
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    Document 29 - file: a2019-12dmcmdafiling006.jpg

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    <FILENAME>a2019-12dmcmdafiling007.jpg
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    Document 30 - file: a2019-12dmcmdafiling007.jpg

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    Document 31 - file: a2019-12dmcmdafiling008.jpg

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    Document 32 - file: a2019-12dmcmdafiling009.jpg

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    Document 33 - file: denison-aiff2019vedgar000.jpg

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    <FILENAME>denison-aiff2019vedgar001.jpg
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    Document 34 - file: denison-aiff2019vedgar001.jpg

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    <SEQUENCE>35
    <FILENAME>denison-aiff2019vedgar002.jpg
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    Document 35 - file: denison-aiff2019vedgar002.jpg

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    <FILENAME>denison-aiff2019vedgar003.jpg
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    Document 36 - file: denison-aiff2019vedgar003.jpg

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    <FILENAME>denison-aiff2019vedgar004.jpg
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    Document 37 - file: denison-aiff2019vedgar004.jpg

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    Document 38 - file: denison-aiff2019vedgar005.jpg

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    Document 39 - file: denison-aiff2019vedgar006.jpg

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    Document 40 - file: denison-aiff2019vedgar007.jpg

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    Document 41 - file: denison-aiff2019vedgar008.jpg

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    Document 42 - file: denison-aiff2019vedgar009.jpg

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    Document 43 - file: denison-aiff2019vedgar010.jpg

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    Document 45 - file: denison-aiff2019vedgar012.jpg

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    Document 54 - file: ex99-4auditorconsent000.jpg

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    Document 55 - file: ex99-9srkconsent000.jpg

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    Document 56 - file: ex99-gdsekellerconsent000.jpg

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    Document 58 - file: rpa.jpg

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