Exhibit 99.4

Ontario Securities Commission

FORM 13-502F1

CLASS 1 and CLASS 3B REPORTING ISSUERS - PARTICIPATION FEE

MANAGEMENT CERTIFICATION

I,         Amanda Willett                                                                                                                      ,

  an officer of the reporting issuer noted below have examined this Form 13-502F1 (the Form) being submitted hereunder to the Ontario Securities Commission and certify that to my knowledge, having exercised reasonable diligence, the information provided in the Form is complete and accurate.

(s)         "Amanda Willett"	March 4, 2021
Name: Amanda Willett Title: Vice President Legal & Corporate Secretary	Date

Reporting Issuer Name:        Denison Mines Corp.

End date of previous financial year:    December 31, 2020

Type of Reporting Issuer:    _x_ Class 1 reporting issuer            ___ Class 3 reporting issuer

    Highest Trading Marketplace:     Toronto Stock Exchange

    (refer to the definition of “highest trading marketplace” under OSC Rule 13-502 Fees) 

Market value of listed or quoted securities:

(in Canadian Dollars - refer to section 7.1 of OSC Rule 13-502 Fees)

Equity Symbol:    DML

1st Specified Trading Period (dd/mm/yy)
(refer to the definition of “specified trading period” under OSC
Rule 13-502 Fees )	2020-01-01	to	2020-03-31
Closing price of the security in the class or series on the last trading day of the specified trading period in which such
security was listed or quoted on the highest trading marketplace			$0.370 (iii)
Number of securities in the class or series of such security outstanding at the end of the last trading day of
the specified trading period			597,229,817 (iv)
Market value of class or series			(iii) x (iv) =                    $220,975,032.29 (A)

2nd Specified Trading Period (dd/mm/yy)
(refer to the definition of “specified trading period” under OSC
Rule 13-502 Fees )	2020-04-01	to	2020-06-30
Closing price of the security in the class or series on the last trading day of the specified trading period in which such
security was listed or quoted on the highest trading marketplace			$0.480 (iii)
Number of securities in the class or series of such security outstanding at the end of the last trading day of
the specified trading period			626,057,148 (iv)
Market value of class or series			(iii) x (iv) =                    $300,507,431.04 (B)
3rd Specified Trading Period (dd/mm/yy)
(refer to the definition of “specified trading period” under OSC
Rule 13-502 Fees )	2020-07-01	to	2020-09-30
Closing price of the security in the class or series on the last trading day of the specified trading period in which such
security was listed or quoted on the highest trading marketplace			$0.560 (v)
Number of securities in the class or series of such security outstanding at the end of the last trading day of
the specified trading period			626,321,102 (vi)
Market value of class or series			(v) x (vi) =                    $350,739,817.12 (C)

4th Specified Trading Period (dd/mm/yy)

(refer to the definition of “specified trading period” under OSC
Rule 13-502 Fees )	2020-10-01	to	2020-12-31
Closing price of the security in the class or series on the last trading day of the specified trading period in which such
security was listed or quoted on the highest trading marketplace			$0.840 (vii)
Number of securities in the class or series of such security outstanding at the end of the last trading day of
the specified trading period			678,981,882 (viii)
Market value of class or series			(vii) x (viii) =                      $570,344,780.88 (D)

5th Specified Trading Period (dd/mm/yy)

(refer to the definition of “specified trading period” under OSC
Rule 13-502 Fees )	n/a	to	_____________
Closing price of the security in the class or series on the last trading day of the specified trading period in which such
security was listed or quoted on the highest trading marketplace			________ (ix)
Number of securities in the class or series of such security outstanding at the end of the last trading day of
the specified trading period			____________ (x)
Market value of class or series			(ix) x (x) =                    $                             0.00 (E)

Average Market Value of Class or Series

(Calculate the simple average of the market value of the class or (series of security for each applicable specified trading period

(i.e. A through E above))                                                                                                                           

                                    $360,641,765.33  (1)

(Repeat the above calculation for each other class or series of equity securities of the reporting issuer (and a subsidiary pursuant to paragraph 2.8(1)(c) of OSC Rule 13-502 Fees, if applicable) that was listed or quoted on a marketplace at the end of the previous financial year)

Fair value of outstanding debt securities:

(See paragraph 2.8(1)(b), and if applicable, paragraph 2.8(1)(c)
(of OSC Rule 13-502 Fees)		$0.00	(2)
(Provide details of how value was determined)
Capitalization for the previous financial year Participation Fee	(1) + (2)	$360,641,765.33
(For Class 1 reporting issuers, from Appendix A of OSC Rule 13-502 Fees, select the participation fee)		$29,365
(For Class 3B reporting issuers, from Appendix A.1 of OSC Rule 13-502 Fees, select the participation fee)		$0
Late Fee, if applicable		$0.00

(As determined under section 2.7 of OSC Rule 13-502 Fees )

Total Fee Payable                                                                                                                                                                                                                            $29,365.00

(Participation Fee plus Late Fee)