<SEC-DOCUMENT>0001539497-25-001175.txt : 20250418
<SEC-HEADER>0001539497-25-001175.hdr.sgml : 20250418
<ACCEPTANCE-DATETIME>20250418164938
ACCESSION NUMBER:		0001539497-25-001175
CONFORMED SUBMISSION TYPE:	424B3
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20250418
DATE AS OF CHANGE:		20250418

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NIOCORP DEVELOPMENTS LTD
		CENTRAL INDEX KEY:			0001512228
		STANDARD INDUSTRIAL CLASSIFICATION:	METAL MINING [1000]
		ORGANIZATION NAME:           	01 Energy & Transportation
		EIN:				000000000
		STATE OF INCORPORATION:			A1
		FISCAL YEAR END:			0630

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-280176
		FILM NUMBER:		25850786

	BUSINESS ADDRESS:	
		STREET 1:		7000 S. YOSEMITE STREET
		STREET 2:		STE. 115
		CITY:			CENTENNIAL
		STATE:			CO
		ZIP:			80112
		BUSINESS PHONE:		720-639-4647

	MAIL ADDRESS:	
		STREET 1:		7000 S. YOSEMITE STREET
		STREET 2:		STE. 115
		CITY:			CENTENNIAL
		STATE:			CO
		ZIP:			80112

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	QUANTUM RARE EARTH DEVELOPMENTS CORP.
		DATE OF NAME CHANGE:	20110204
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B3
<SEQUENCE>1
<FILENAME>n2574_x259-424b3.htm
<DESCRIPTION>FORM 424B3
<TEXT>
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<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 8pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="white-space: nowrap; width: 33%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="white-space: nowrap; width: 34%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="white-space: nowrap; width: 33%; text-align: right"><FONT STYLE="font-size: 10pt"><B>Filed Pursuant to Rule 424(b)(3)</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="white-space: nowrap"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="white-space: nowrap"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="white-space: nowrap; text-align: right"><FONT STYLE="font-size: 10pt"><B>Registration No.: 333-280176</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="white-space: nowrap"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="white-space: nowrap"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="white-space: nowrap; text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  </TABLE>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Prospectus Supplement<BR>
(to Prospectus dated June 27, 2024)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 20pt; text-align: center"><IMG SRC="n2574_img001.jpg" ALT=""></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt; text-align: center; text-indent: 0pt">6,628,846 Common Shares</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0pt 10pt; text-align: center; text-indent: 0pt">1,063,462 Pre-Funded Warrants to Purchase 1,063,462 Common Shares<BR>
<BR></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We are offering 6,628,846 of our common shares, without par value (&ldquo;Common Shares&rdquo;) and, in lieu of Common Shares to certain investors that so choose, 1,063,462 pre-funded warrants to purchase an aggregate of 1,063,462 Common
Shares (the &ldquo;Pre-Funded Warrants&rdquo;). The purchase price of each Pre-Funded Warrant will equal the price per share at which
each Common Share is sold to the public in this offering, minus $0.0001, which is the exercise price of each Pre-Funded Warrant. The
Pre-Funded Warrants will not have an expiration date and will be immediately exercisable. The public offering price for each Common Share
is $2.60. This prospectus supplement also relates to the offering of Common Shares issuable
upon exercise of the Pre-Funded Warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Our Common Shares trade on the Nasdaq Global
Market under the symbol &ldquo;NB.&rdquo; On April 15, 2025, the last reported sale price of our Common Shares on the Nasdaq Global Market
was $2.89 per Common Share. There is no established trading market for the Pre-Funded Warrants and we do not expect a market to develop.
In addition, we do not intend to list the Pre-Funded Warrants on any national securities exchange or any other nationally recognized trading
system.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in"><B>Investing in our securities involves a high
degree of risk. See &ldquo;<I>Risk Factors</I>&rdquo; beginning on page S-4 of this prospectus supplement and on page 2 of the accompanying
prospectus, and the documents incorporated by reference herein and therein.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in"><B>Neither the Securities and Exchange Commission
(the &ldquo;SEC&rdquo;) nor any state securities commission has approved or disapproved of these securities or determined if this prospectus
supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="3" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Per Common Share</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="3" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Per Pre-Funded Warrant</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="3" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Total</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 46%; padding-left: 5pt">Public offering price</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 2%; text-align: left">$</TD><TD STYLE="width: 14%; text-align: right">2.600</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 2%; text-align: left">$</TD><TD STYLE="width: 14%; text-align: right">2.5999</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 2%; text-align: left">$</TD><TD STYLE="width: 14%; text-align: right">19,999,894.45</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-left: 5pt"><FONT STYLE="font-size: 10pt">Underwriting discounts and commissions<SUP>(1)</SUP></FONT></TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">0.182</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">0.1820</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1,400,000.06</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-left: 5pt"><FONT STYLE="font-size: 10pt">Proceeds, before expenses, to us<SUP>(2)</SUP></FONT></TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">2.418</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">2.4179</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">18,599,894.40</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
  </TABLE>

<P STYLE="margin-top: 0; margin-bottom: 0"></P>

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<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in">(1)</TD><TD>Includes an underwriting discount of 7.00% on the public offering price of the Common Shares and the Pre-Funded Warrants. See &ldquo;Underwriting&rdquo;
beginning on page S-24 of this prospectus supplement for additional information regarding the compensation payable to the underwriter
in connection with this offering.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 6pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in">(2)</TD><TD>Does not give effect to the sale of any Option Shares (as defined below) or the exercise of any Pre-Funded Warrants offered hereby.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We have granted the underwriter an over-allotment
option for a period of 30 days to purchase up to 1,153,846 additional Common Shares
(&ldquo;Option Shares&rdquo;) (equal to 15% of the aggregate number of initial Common Shares and Pre-Funded Warrants offered hereby) at a purchase price, before
giving effect to applicable underwriting discounts and commissions, of $2.60 per
Option Share. If the underwriter exercises the over-allotment option to purchase Option Shares in full, without giving effect to the exercise
of any Pre-Funded Warrants, the total proceeds to us, before expenses payable by us, will be approximately $21,389,894.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The securities are expected to be delivered
on or about April 21, 2025.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: center"><B><I>Sole Book-Running Manager</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: center"><B>Maxim Group LLC</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 22pt; text-align: center">The date of this prospectus supplement is April 17,
2025.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 22pt; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 22pt; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 22pt; text-align: center">&nbsp;</P>


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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: center">TABLE OF CONTENTS<SUP></SUP></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: center">Prospectus Supplement</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: right"><U>Page</U></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 90%; text-align: left; text-indent: 0pt; padding-left: 0pt"><A HREF="#a_Toc195656900">About This Prospectus Supplement</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right; width: 10%">S-iv</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; text-indent: 0pt; padding-left: 0pt"><A HREF="#a_Toc195656901">Where You Can Find More Information</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right">S-iv</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; text-indent: 0pt; padding-left: 0pt"><A HREF="#a_Toc195656902">Incorporation of Documents By Reference</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right">S-v</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; text-indent: 0pt; padding-left: 0pt"><A HREF="#a_Toc195656903">Prospectus Supplement Summary</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right">S-1</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; text-indent: 0pt; padding-left: 0pt"><A HREF="#a_Toc195656904">Risk Factors</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right">S-4</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; text-indent: 0pt; padding-left: 0pt"><A HREF="#a_Toc195656905">Cautionary Note Regarding Forward-Looking Statements</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right">S-7</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-indent: 0pt; padding-left: 0pt"><A HREF="#a_Toc195656906">Use of Proceeds</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right">S-9</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 0pt; text-align: left; text-indent: 0pt"><A HREF="#a_Toc195656907">Dilution</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right">S-9</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-indent: 0pt; padding-left: 0pt"><A HREF="#a_Toc195656908">Description of Securities</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right">S-10</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; text-indent: 0pt; padding-left: 0pt"><A HREF="#a_Toc195656909">Certain United States Federal Income Tax Considerations</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right">S-15</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; text-indent: 0pt; padding-left: 0pt"><A HREF="#a_Toc195656910">Certain Canadian Federal Income Tax Considerations For U.S. Residents</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right">S-22</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 0pt; text-align: left; text-indent: 0pt"><A HREF="#a_Toc195656911"> Underwriting</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right">S-24</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; text-indent: 0pt; padding-left: 0pt"><A HREF="#a_Toc195656912">Legal Matters</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right">S-30</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 0pt; text-align: left; text-indent: 0pt"><A HREF="#a_Toc195656913"> Experts</A></TD>
    <TD STYLE="padding-right: 5pt; white-space: nowrap; text-align: right">S-30</TD></TR>
  </TABLE>




<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: center">Prospectus</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: right"><U>Page</U><sup></sup></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0pt 6pt; text-indent: 0pt"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 90%; text-align: left; padding-top: 0in; padding-left: 0in"><A HREF="#a_Toc168935653">About This Prospectus</A></TD>
    <TD STYLE="width: 10%; text-align: right; padding-top: 0in"><A HREF="#a_Toc168935653">ii</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-top: 0in; padding-left: 0in"><A HREF="#a_Toc168935654">Where You Can Find More Information</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in"><A HREF="#a_Toc168935654">iii</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-top: 0in; padding-left: 0in"><A HREF="#a_Toc168935655">Information Incorporated by Reference</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in"><A HREF="#a_Toc168935655">iv</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-top: 0in; padding-left: 0in"><A HREF="#a_Toc168935656">Summary</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in"><A HREF="#a_Toc168935656">1</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-top: 0in; padding-left: 0in"><A HREF="#a_Toc168935657">Risk Factors</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in"><A HREF="#a_Toc168935657">2</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-top: 0in; padding-left: 0in"><A HREF="#a_Toc168935658">Cautionary Note Regarding Forward-Looking Statements</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in"><A HREF="#a_Toc168935658">3</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-top: 0in; padding-left: 0in"><A HREF="#a_Toc168935659">Use of Proceeds</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in"><A HREF="#a_Toc168935659">5</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-top: 0in; padding-left: 0in"><A HREF="#a_Toc168935660">Description of Capital Stock</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in"><A HREF="#a_Toc168935660">6</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-top: 0in; padding-left: 0in"><A HREF="#a_Toc168935661">Description of Warrants</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in"><A HREF="#a_Toc168935661">14</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-top: 0in; padding-left: 0in"><A HREF="#a_Toc168935662">Description of Units</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in"><A HREF="#a_Toc168935662">16</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-top: 0in; padding-left: 0in"><A HREF="#a_Toc168935663">Plan of Distribution</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in"><A HREF="#a_Toc168935663">17</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-top: 0in; padding-left: 0in"><A HREF="#a_Toc168935664">Legal Matters</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in"><A HREF="#a_Toc168935664">19</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-top: 0in; padding-left: 0in"><A HREF="#a_Toc168935665">Experts</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in"><A HREF="#a_Toc168935665">20</A></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0pt 6pt; text-indent: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0pt 6pt; text-indent: 0pt"></P>

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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Toc194695851"></A><A NAME="a_Toc195656900"></A>
About This Prospectus Supplement</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">On June 13, 2024, we filed with the SEC a registration
statement on Form S-3. That registration statement was declared effective on June 27, 2024.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">This prospectus supplement describes the specific
terms of the securities we are offering and adds to, and updates, information in the accompanying prospectus and the documents incorporated
by reference herein and therein. If there is a conflict between the information contained in this prospectus supplement and the information
contained in the accompanying prospectus or any document incorporated by reference into it or into this prospectus supplement that was
filed with the SEC before the date of this prospectus supplement, you should rely on the information in this prospectus supplement. If
any statement in one of these documents is inconsistent with a statement in another document having a later date&mdash;for example, a
document incorporated by reference into this prospectus supplement&mdash;the statement in the document having the later date modifies
or supersedes the earlier statement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Documents incorporated by reference herein
include industry and market data and other information that we have obtained from, or which is based upon, market research, independent
industry publications or other publicly available information. Any such data and other information is subject to change based on various
factors, including those described in this prospectus supplement and the accompanying prospectus under the heading &ldquo;<I>Risk Factors</I>&rdquo;
and under Item 1A. &ldquo;Risk Factors&rdquo; in our most recent Annual Report on Form 10-K filed with the SEC, which is incorporated
herein by reference.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We have not authorized anyone to provide you
with different information from the information contained or incorporated by reference in this prospectus supplement and the accompanying
prospectus or in any free writing prospectus that we may provide you. You should not assume that the information contained in this prospectus
supplement, the accompanying prospectus, any document incorporated by reference, or any free writing prospectus is accurate as of any
date, other than the date mentioned on the cover page of these documents. We are not making offers to sell the securities in any jurisdiction
in which an offer or solicitation is not authorized or in which the person making such offer or solicitation is not qualified to do so
or to anyone to whom it is unlawful to make an offer or solicitation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in"><I>Unless we state otherwise or the context
otherwise requires, the terms &ldquo;we,&rdquo; &ldquo;us,&rdquo; &ldquo;our,&rdquo; &ldquo;our business,&rdquo; &ldquo;NioCorp,&rdquo;
&ldquo;the Company&rdquo; and similar references refer to NioCorp Developments Ltd. and its consolidated subsidiaries.</I></P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">This prospectus supplement and the accompanying
prospectus contain our registered and unregistered trademarks and service marks, as well as trademarks and service marks of third parties.
Solely for convenience, these trademarks and service marks are referenced without the &reg;, &trade; or similar symbols, but such references
are not intended to indicate, in anyway, that we will not assert, to the fullest extent under applicable law, our rights to these trademarks
and service marks. All brand names, trademarks and service marks appearing in this prospectus supplement and the accompanying prospectus
are the property of their respective holders.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Toc194695852"></A><A NAME="a_Toc195656901"></A>Where
You Can Find More Information</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">This prospectus supplement and the accompanying
prospectus are part of a registration statement on Form S-3 that we filed with the SEC under the Securities Act of 1933, as amended (the
&ldquo;Securities Act&rdquo;), and does not contain all the information set forth or incorporated by reference in the registration statement.
Whenever a reference is made in this prospectus supplement and the accompanying prospectus to any of our contracts, agreements or other
documents, the reference may not be complete and you should refer to the exhibits that are a part of the registration statement of which
this prospectus supplement and the accompanying prospectus are a part or the exhibits to the reports or other documents incorporated by
reference into this prospectus supplement and the accompanying prospectus for a copy of such contract, agreement or other document. You
may obtain copies of the registration statement and its exhibits via the SEC&rsquo;s EDGAR database.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We file annual, quarterly and current reports,
proxy statements and other information with the SEC under the Exchange Act. The SEC maintains a website that contains reports, proxy
and information statements and other information regarding issuers, including us, that file electronically with the SEC. You may obtain
documents that we file with the SEC at <FONT STYLE="color: #0000EE"><U>www.sec.gov</U></FONT>.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We make available, free of charge, on our
website at <FONT STYLE="color: #0000EE"><U>www.niocorp.com</U></FONT>, our annual reports on Form 10-K, quarterly reports on Form 10-Q,
current reports on Form 8-K, proxy statements and amendments to those reports and statements as soon as reasonably practicable after
they are filed with the SEC. We do not incorporate the information on or accessible through any website into this</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">prospectus supplement or the accompanying prospectus, and you should
not consider any information on, or that can be accessed through, any website as part of this prospectus supplement and the accompanying
prospectus. Our website address and the SEC&rsquo;s website address are included in this prospectus supplement and the accompanying prospectus
as inactive textual references only.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Toc194695853"></A><A NAME="a_Toc195656902"></A>Incorporation
of Documents By Reference</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">SEC rules permit us to incorporate information
by reference into this prospectus supplement and the accompanying prospectus. This means that we can disclose important information to
you by referring you to another document filed separately with the SEC. The information incorporated by reference is considered to be
part of this prospectus supplement and the accompanying prospectus, except for information superseded by information contained in this
prospectus supplement and the accompanying prospectus itself or in any subsequently filed incorporated document. This prospectus supplement
and the accompanying prospectus incorporate by reference the documents set forth below that we have previously filed with the SEC, other
than information in such documents that is deemed to be furnished and not filed. These documents contain important information about us
and our business and financial condition. Any report or information within any of the documents referenced below that is furnished, but
not filed, shall not be incorporated by reference into this prospectus supplement and the accompanying prospectus:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="color: Black">&#9679;</FONT></TD><TD><FONT STYLE="color: Black">our
                                            Annual Report on Form 10-K for the fiscal year ended June 30, 2024, filed with the SEC on
                                            </FONT><FONT STYLE="color: #0000EE"><U><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724001980/n2574_x219-10k.htm" STYLE="-sec-extract: exhibit">September 23, 2024</A></U></FONT><FONT STYLE="color: Black">;</FONT></TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>our Quarterly Reports on Form 10-Q for the quarterly period
                                            ended September 30, 2024, filed with the SEC on <FONT STYLE="color: #0000EE"><U><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724002408/n2574_x224-10q.htm" STYLE="-sec-extract: exhibit">November 13, 2024</A></U></FONT>, and for the quarterly period ended December
                                            31, 2024, filed with the SEC on <FONT STYLE="color: #0000EE"><U><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949725000398/n2574_x249-10q.htm" STYLE="-sec-extract: exhibit">February 7, 2025</A></U></FONT>;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>our Current Reports on Form 8-K, filed with the SEC on <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724001847/n2574_x217-8k.htm" STYLE="-sec-extract: exhibit">September 4, 2024</A>, <FONT STYLE="color: #0000EE"><U><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724001909/n2574_x218-8k.htm" STYLE="-sec-extract: exhibit">September
                                            11, 2024</A></U></FONT>, <FONT STYLE="color: #0000EE"><U><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724002105/n2574_x220-8k.htm" STYLE="-sec-extract: exhibit">October
                                            3, 2024</A></U></FONT>, <FONT STYLE="color: #0000EE"><U><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724002341/n2574_x223-8k.htm" STYLE="-sec-extract: exhibit">November
                                            5, 2024</A></U></FONT> (items 1.01 and 8.01 and related exhibits only), <FONT STYLE="color: Black"><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724002731/n2574-x240_8k.htm" STYLE="-sec-extract: exhibit">December 30, 2024</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949725000030/n2574_x241-8k.htm" STYLE="-sec-extract: exhibit">January 6, 2025</A>,</FONT> <FONT STYLE="color: #0000EE"><U><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949725000083/n2574_x243-8k.htm" STYLE="-sec-extract: exhibit">January
                                            13, 2025</A></U></FONT>, <FONT STYLE="color: Black"><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949725000227/n2574_x246-8k.htm" STYLE="-sec-extract: exhibit">January 31, 2025</A></FONT> (items 1.01 and
                                            8.01 and related exhibits only), <FONT STYLE="color: Black"><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949725000735/n2574_x251-8k.htm" STYLE="-sec-extract: exhibit">February 19, 2025</A></FONT> and
                                            <FONT STYLE="color: Black"><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949725000997/n2574_x254-8k.htm" STYLE="-sec-extract: exhibit">March 20, 2025</A></FONT>; and</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="color: Black">&#9679;</FONT></TD><TD><FONT STYLE="color: Black">a
                                            description of our Common Shares, contained in our Registration Statement on Form 8-A, filed
                                            with the SEC on </FONT><FONT STYLE="color: #0000EE"><U><A HREF="https://www.sec.gov/Archives/edgar/data/1512228/000153949723000456/n2574_x102-8a12b.htm" STYLE="-sec-extract: exhibit">March 17, 2023</A></U></FONT><FONT STYLE="color: Black">,
                                            and any subsequently filed amendments and reports filed for the purpose of updating that
                                            description.</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We also incorporate by reference any future
filings made by us with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Exchange Act (excluding any information furnished to, rather
than filed with, the SEC) prior to the termination of the offering of the securities made by this prospectus supplement and the accompanying
prospectus. Information in such future filings updates and supplements the information provided in this prospectus supplement and the
accompanying prospectus. Any statements in any such future filings will automatically be deemed to modify and supersede any information
in any document we previously filed with the SEC that is incorporated or deemed to be incorporated herein by reference to the extent that
statements in the later filed document modify or replace such earlier statements.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">You may request a copy of these filings, at
no cost, by writing or calling us at the following address or telephone number below:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: center">NioCorp Developments Ltd.<BR>
7000 South Yosemite Street, Suite 115<BR>
Centennial, Colorado 80112<BR>
Phone: (720) 334-7066</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 22pt; text-indent: 0.25in">Those copies will not include exhibits, unless
the exhibits have specifically been incorporated by reference in this document or you specifically request them.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 22pt; text-indent: 0.25in">&nbsp;</P>


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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 10pt 0pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Toc194695854"></A><A NAME="a_Toc195656903"></A>
Prospectus Supplement Summary</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in"><I>This summary highlights selected information
appearing in this prospectus supplement. Because it is a summary, it may not contain all of the information that may be important to you.
To understand this offering fully, you should read this entire prospectus supplement and the accompanying prospectus carefully, including
the information set forth in the section entitled &ldquo;Risk Factors&rdquo; contained in this prospectus supplement and the accompanying
prospectus and under similar headings in the other documents that are incorporated by reference into this prospectus supplement and the
accompanying prospectus. You should also carefully read the information incorporated by reference into this prospectus supplement and
the accompanying prospectus, including our consolidated financial statements and related notes and the exhibits to the registration statement
of which this prospectus supplement and the accompanying prospectus are a part, before making an investment decision. This prospectus
supplement and the accompanying prospectus include forward-looking statements that involve risks and uncertainties. See &ldquo;Cautionary
Note Regarding Forward-Looking Statements.&rdquo;</I></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: center">About the Company</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">NioCorp Developments Ltd.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">NioCorp is developing the Elk Creek Project
(as defined below) located in southeast Nebraska. The &ldquo;Elk Creek Project&rdquo; is a development-stage property that has disclosed
niobium, scandium, and titanium reserves and resources and disclosed rare earth mineral resources. The Company is continuing technical
and economic studies around the rare earths contained in the Elk Creek Project&rsquo;s mineral resource in order to determine whether
extraction of rare earth elements can be reasonably justified and economically viable after taking into account all relevant factors.
Niobium has developing applications in the formulation of solid-state lithium-ion batteries, which may reduce charging times and increase
battery safety. Niobium is used to produce various superalloys that are extensively used in high performance aircraft and jet turbines.
It also is used in high-strength, low-alloy steel, a stronger steel used in automobiles, bridges, structural systems, buildings, pipelines,
and other applications that generally increases strength and/or reduces weight, which can result in environmental benefits, including
reduced fuel consumption and material usage and fewer air emissions. Scandium can be combined with aluminum to make high-performance alloys
with increased strength and improved corrosion resistance. Scandium also is a critical component of advanced solid oxide fuel cells, an
environmentally preferred technology for high-reliability, distributed electricity generation. Titanium is a component of various superalloys
and other applications that are used for aerospace applications, weapons systems, protective armor, medical implants, and many others.
It also is used in pigments for paper, paint, and plastics. Rare earths are critical to electrification and decarbonization initiatives
and can be used to manufacture the strongest permanent magnets commercially available.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Our primary business strategy is to advance
our Elk Creek Project to commercial production. We are focused on obtaining additional funds to carry out our near-term planned work programs
associated with securing the project financing necessary to complete mine development and construction of the Elk Creek Project.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Recent Developments</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0in"><B><I>Yorkville Equity Facility Financing Agreement
Advance Notice</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.25in">On April 14, 2025, we delivered a written notice
(the &ldquo;Advance Notice&rdquo;) pursuant to the Yorkville Equity Facility Financing Agreement (as defined below), requesting the purchase
of 1,100,000 Common Shares (the &ldquo;Advance Shares&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.25in">We have elected an Option 2 Pricing Period
(as defined in the Yorkville Equity Facility Financing Agreement). Subject to the satisfaction of certain conditions contained in the
Yorkville Equity Facility Financing Agreement, the Advance Shares will be issued at a purchase price equal to 97% of the daily volume-weighted
average price of the Common Shares on the Nasdaq Global Market as reported on Bloomberg Financial Markets during a pricing period of three
consecutive trading days commencing on April 14, 2025.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.25in">This prospectus supplement does not constitute an offer to sell or the solicitation of an offer to buy any securities pursuant to the Yorkville Equity Facility Financing Agreement. The Advance Shares are being offered and sold in reliance on the exemption from registration set forth in Section 4(a)(2) of the Securities Act. The issuance and sale by the Company of the Advance Shares have not been registered
under the Securities Act, or the securities laws of any state or other jurisdiction, and may not be offered or sold in the United States without registration or an applicable exemption from the registration requirements of the Securities Act and applicable state securities or blue sky laws and foreign securities laws. In Canada, no offering of securities shall be made except by means of a</P>
</DIV>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0pt 10pt">prospectus in accordance with the requirements of applicable Canadian
securities laws or an exemption therefrom. This prospectus supplement is not, and under no circumstances is it to be construed as, a prospectus,
offering memorandum, an advertisement or a public offering in any province or territory of Canada. In Canada, no prospectus has been filed
with any securities commission or similar regulatory authority in respect of any of the Advance Shares.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0in"><B><I>Release of Third Quarter Preliminary Results</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.25in">On April 11, 2025, we provided our preliminary
financial results for the three- and nine-month periods ended March 31, 2025.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.25in">Selected financial results expectations for
the periods include:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>Loss for the three-month period ended March 31, 2025, of $5.4 million, or $0.11 per share, compared to a loss for the three-month
period ended March 31, 2024, of $4.2 million, or $0.11 per share; and<BR>
<BR>
</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>Loss for the nine-month period ended March 31, 2025, of $8.0 million, or $0.17 per share, compared to a loss for the nine-month period
ended March 31, 2024, of $11.0 million, or $0.29 per share.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.25in">Our preliminary results for the three-and nine-month
periods ended March 31, 2025 are preliminary and are unaudited and subject to change and adjustment as we prepare our unaudited interim
condensed consolidated financial statements for the three- and nine-month periods ended March 2025 and 2024.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The preliminary results included herein have been prepared by, and are the responsibility of, our management. Our independent registered public accounting firm, Deloitte &amp; Touche LLP, has not audited, reviewed, compiled or performed any procedures with respect to this preliminary financial information and, accordingly, Deloitte &amp; Touche LLP does not express an opinion or any other form of assurance
with respect thereto. Further, our former independent registered public accounting firm, BDO USA, P.C., has not audited, reviewed, compiled or performed any procedures with respect to this preliminary financial information and, accordingly, BDO USA, P.C. does not express an opinion or any other form of assurance with respect thereto.</P>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Corporate Information</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Our Common Shares trade on the Nasdaq Global
Market under the symbol &ldquo;NB.&rdquo; The public NioCorp Assumed Warrants (as defined herein) trade on the Nasdaq Capital Market
under the symbol &ldquo;NIOBW.&rdquo; Our principal executive office is located at 7000 South Yosemite Street, Suite 115, Centennial,
CO 80112, and our telephone number is (720) 334-7066. Our website address is <FONT STYLE="color: #0000EE"><U>www.niocorp.com</U></FONT>.
This website address is not intended to be an active link. Information on, or accessible through, our website is not incorporated by
reference into this prospectus supplement or the accompanying prospectus and you should not consider any information on, or that can
be accessed from, our website as part of this prospectus supplement and the accompanying prospectus.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: center">The Offering</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 8pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 12pt; width: 2.5in"><FONT STYLE="font-size: 10pt"><B>Common Shares<BR>
 Offered by this <BR>
Prospectus Supplement</B></FONT></TD>
    <TD STYLE="padding-bottom: 12pt"><FONT STYLE="font-size: 10pt">6,628,846 common shares, without
    par value, of the Company (&ldquo;Common Shares&rdquo;).</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 12pt"><FONT STYLE="font-size: 10pt"><B>Pre-Funded Warrants <BR>
Offered by this <BR>
Prospectus Supplement</B></FONT></TD>
    <TD STYLE="padding-bottom: 12pt"><FONT STYLE="font-size: 10pt">We are also offering, in lieu of Common Shares to certain investors that so choose, pre-funded
    warrants to purchase an aggregate of 1,063,462 Common Shares (the &ldquo;Pre-Funded
    Warrants&rdquo;). The purchase price of each Pre-Funded Warrant will equal the price per share at which each Common Share is sold
    to the public in this offering, minus $0.0001, which is the exercise price of each Pre-Funded Warrant. This prospectus supplement
    also relates to the offering of the shares of our common stock issuable upon exercise of the pre-funded warrants.</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 12pt"><FONT STYLE="font-size: 10pt"><B>Over-Allotment Option</B></FONT></TD>
    <TD STYLE="padding-bottom: 12pt"><FONT STYLE="font-size: 10pt">We have also granted to the underwriter an over-allotment option to purchase up to 1,153,846 Common Shares (the &ldquo;Option Shares&rdquo;) (equal to 15% of the aggregate number of initial Common Shares and Pre-Funded Warrants offered hereby) at
    a purchase price, before giving effect to applicable underwriting discounts and commissions, of $2.60 per
    Option Share.</FONT></TD></TR>
  </TABLE>

</DIV>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 8pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 10pt; width: 2.5in"><FONT STYLE="font-size: 10pt"><B>Common Shares <BR>
Outstanding Prior to <BR>
this Offering<SUP>(1)</SUP></B></FONT></TD>
    <TD STYLE="padding-bottom: 10pt"><FONT STYLE="font-size: 10pt">47,238,119 Common Shares (as of April 14, 2025).</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 10pt"><FONT STYLE="font-size: 10pt"><B>Common Shares <BR>
Outstanding After this <BR>
Offering<SUP>(1)</SUP></B></FONT></TD>
    <TD STYLE="padding-bottom: 10pt"><FONT STYLE="font-size: 10pt">53,866,965 Common Shares (55,020,811 Common Shares if the underwriter exercises its over-allotment option to purchase Option Shares in full).</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 10pt"><FONT STYLE="font-size: 10pt"><B>Use of Proceeds</B></FONT></TD>
    <TD STYLE="padding-bottom: 10pt"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"><FONT STYLE="font-size: 10pt">We estimate that the net proceeds
    from the sale of the Common Shares and the Pre-Funded Warrants that we are offering, after deducting underwriting discounts and commissions
    and estimated offering expenses but before giving effect to the exercise of any Pre-Funded Warrants, will be approximately $18.1 million ($20.9 million if the underwriter exercises its over-allotment option to purchase
    Option Shares in full).</FONT></P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt"><FONT STYLE="font-size: 10pt">We expect to use the net proceeds
    from this offering for working capital and general corporate purposes, including to advance our efforts to launch construction of
    the Elk Creek Project and move it to commercial operation. See &ldquo;<I>Use of Proceeds</I>.&rdquo;</FONT></P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 10pt"><FONT STYLE="font-size: 10pt"><B>Dividend Policy</B></FONT></TD>
    <TD STYLE="padding-bottom: 10pt"><FONT STYLE="font-size: 10pt">We have not paid dividends on our Common Shares and do not intend to pay dividends in the foreseeable
    future.</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 10pt"><FONT STYLE="font-size: 10pt"><B>Trading Market</B></FONT></TD>
    <TD STYLE="padding-bottom: 10pt"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"><FONT STYLE="font-size: 10pt">Our Common Shares trade on the
    Nasdaq Global Market under the symbol &ldquo;NB.&rdquo;</FONT></P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt"><FONT STYLE="font-size: 10pt">There is no established trading
    market for the Pre-Funded Warrants and we do not expect a market to develop. In addition, we do not intend to list the Pre-Funded
    Warrants on any national securities exchange or any other nationally recognized trading system.</FONT></P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 10pt"><FONT STYLE="font-size: 10pt"><B>Risk Factors</B></FONT></TD>
    <TD STYLE="padding-bottom: 10pt"><FONT STYLE="font-size: 10pt">See &ldquo;<I>Risk Factors</I>&rdquo; beginning on page S-4 of this prospectus supplement, on
    page 2 of the accompanying prospectus and in the documents incorporated by reference herein and therein for a discussion of factors
    you should consider before investing in our securities.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&thinsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P>
<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 6pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in">(1)</TD><TD>Does not include:</TD></TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&thinsp;</P>


<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>Common Shares issuable upon exercise of any Pre-Funded Warrants offered hereby;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>Common Shares issuable upon exercise of outstanding stock options under the NioCorp Developments Ltd. Long-Term Incentive Plan, as
amended (the &ldquo;LTIP&rdquo;);</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>Common Shares reserved for future issuance under the LTIP;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>Common Shares issuable in respect of the commitment amount under the Standby Equity Purchase Agreement, dated January 26, 2023 (the
&ldquo;Yorkville Equity Facility Financing Agreement&rdquo;), between the Company and YA II PN, Ltd. (&ldquo;Yorkville&rdquo;), a fund
managed by Yorkville Advisors Global, LP, including the Advance Shares;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>an aggregate of 7,325,627 Common Shares issuable under certain conditions upon exchange of shares of Class B common stock of the Company&rsquo;s
subsidiary, Elk Creek Resources Corp. (&ldquo;ECRC&rdquo;);</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>an aggregate of 17,519,864 Common Shares issuable upon exercise of NioCorp Assumed Warrants; and</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>an aggregate of 13,804,069 Common Shares issuable upon exercise of other outstanding Common Share purchase warrants with a weighted-average
exercise price of approximately $2.15.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

</DIV>

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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Toc194695855"></A><A NAME="a_Toc195656904"></A>
Risk Factors</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in"><I>Investing in our Common Shares involves
a high degree of risk. Before making a decision to invest in our Common Shares, you should carefully consider the risks described below
and under the heading &ldquo;Risk Factors&rdquo; in the accompanying prospectus, and discussed under Part I, Item 1A. &ldquo;Risk Factors&rdquo;
contained in our most recent Annual Report on Form 10-K, which is incorporated by reference into this prospectus supplement and the accompanying
prospectus in their entirety, together with other information in this prospectus supplement and the accompanying prospectus and the documents
incorporated by reference herein and therein. See the sections of this prospectus supplement entitled &ldquo;Where You Can Find More Information&rdquo;
and &ldquo;Incorporation of Documents by Reference.&rdquo; Additional risks and uncertainties not presently known to us or that we currently
deem immaterial may also affect our business, financial condition or results of operations. The occurrence of any of these known or unknown
risks might cause you to lose all or part of your investment in our Common Shares.</I></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Risks Related to this Offering</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Our Common Share price may be volatile and as a result
you could lose all or part of your investment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In addition to volatility associated with equity
securities in general, the value of your investment could decline due to the impact of any of the following factors upon the market price
of the Common Shares:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>disappointing results from our exploration and/or, if warranted, project development efforts;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>decline in demand for Common Shares;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>downward revisions in securities analysts&rsquo; estimates or changes in general market conditions;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>technological innovations by competitors or in competing technologies;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>investor perception of our industry or our prospects; and</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>general economic trends.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In the last twelve months, the trading price
of our stock on the Nasdaq Global Market has ranged from a low of $1.27 to a high of $2.94.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In addition, stock markets in general have
experienced extreme price and volume fluctuations, and the market prices of securities have been highly volatile. These fluctuations are
often unrelated to operating performance and may adversely affect the market price of the Common Shares. As a result, you may be unable
to sell any Common Shares you acquire at a desired price.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Sales of Common Shares in this offering could adversely
affect prevailing market prices for the Common Shares, and you may experience immediate and substantial dilution.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">If all of the Common Shares offered by this
prospectus supplement were issued and outstanding, they would represent a substantial percentage of our public float and of our outstanding
Common Shares. As of April 14, 2025, and after giving effect to this offering, the Common Shares offered by this prospectus supplement would represent approximately
14.1% of the total number of outstanding Common Shares (assuming the underwriter
exercises its over-allotment option to purchase Option Shares in full and not including: Common Shares issuable upon exercise of the Pre-Funded
Warrants offered hereby; Common Shares issuable upon exercise of outstanding stock options, or reserved for future issuance, under the
LTIP; Common Shares issuable in respect of the commitment amount pursuant to the Yorkville Equity Facility Financing Agreement, including
the Advance Shares; and Common Shares issuable upon conversion, exercise or exchange of other outstanding securities, as described herein).
In addition, if all of the Pre-Funded Warrants offered by this prospectus supplement are exercised, the Common Shares offered by this
prospectus supplement would represent an even higher percentage of the total number of outstanding Common Shares. Accordingly, the sale
of the Common Shares offered by this prospectus supplement, or the perception that such sales may occur, could result in a significant
decline in the public trading price of our Common Shares.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In addition, because the price per share of
our Common Shares being offered by this prospectus supplement may be higher than the book value per share of our Common Shares, investors
in this offering may suffer immediate and substantial dilution in the net tangible book value of the Common Shares purchased in this offering.
If all of the Pre-Funded Warrants offered by this prospectus</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">supplement are exercised, further dilution in the net tangible book
value of the Common Shares purchased in this offering could occur. See the section entitled &ldquo;<I>Dilution</I>&rdquo; below for a
more detailed discussion of the dilution investors may incur in this offering.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Future sales, or the perception of future sales, of
Common Shares by existing shareholders or by us, or future dilutive issuances of Common Shares by us, could adversely affect prevailing
market prices for the Common Shares and cause investors to suffer dilution in their net book value per Common Share.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Sales of a substantial number of Common Shares
in the public market could occur at any time, including issuances and sales of additional Common Shares by us and sales by other security
holders. These sales, or the market perception that the holders of a large number of Common Shares or securities convertible, exercisable,
or exchangeable into Common Shares intend to sell Common Shares, could reduce the prevailing market price of the Common Shares. The effect,
if any, that future public sales of these securities or the availability of these securities for sale will have on the market price of
the Common Shares is uncertain. If the market price of the Common Shares were to drop as a result, this might impede our ability to raise
additional capital and might cause remaining shareholders to lose all or part of their investment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The Articles of NioCorp, as amended in connection
with the 2023 Transactions (as defined below), permit us to issue an unlimited number of Common Shares. Subject to the requirements of
the Business Corporations Act (British Columbia) and The Nasdaq Stock Market LLC (&ldquo;Nasdaq&rdquo;), we will not be required to obtain
the approval of the NioCorp shareholders for the issuance of additional Common Shares. We have issued Common Shares in the past and will
continue to issue Common Shares to finance our activities in the future. In addition, outstanding options, warrants to purchase Common
Shares, and securities convertible into or exchangeable for Common Shares may be exercised, converted or exchanged, resulting in the issuance
of additional Common Shares, including, without limitation, an aggregate of 17,519,864 Common Shares issuable upon exercise of NioCorp
Assumed Warrants, an aggregate of 13,804,069 Common Shares issuable upon exercise of other outstanding warrants and an aggregate of 7,325,627
Common Shares issuable under certain conditions upon exchange of shares of Class B common stock of ECRC. If we issue additional Common
Shares or decide to enter into joint ventures with other parties in order to raise financing through the sale of equity securities, investors&rsquo;
interests in the Company will be diluted and investors may suffer dilution in their net book value per Common Share depending on the price
at which such securities are sold.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Additionally, pursuant to the Yorkville Equity
Facility Financing Agreement and prior to giving effect to the Advance Notice, Yorkville has committed to purchase up to an additional
$56.2 million of our Common Shares, at our direction from time to time during the remainder of the commitment period, subject to certain
limitations and the satisfaction of the conditions in the Yorkville Equity Facility Financing Agreement. We have filed a registration
statement under the Securities Act covering resales by Yorkville of the Common Shares issuable pursuant to the Yorkville Equity Facility
Financing Agreement. Accordingly, any Common Shares that we issue pursuant to the Yorkville Equity Facility Financing Agreement will be
available for sale into the public market, subject to applicable securities laws, which could reduce the prevailing market price for the
Common Shares.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Our management will have broad discretion over the use
of the proceeds we receive in this offering and might not apply the proceeds in ways that increase the value of your investment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Our management will have broad discretion to
use the net proceeds from this offering, and we may not apply the net proceeds of this offering in ways that increase the value of your
investment. Pending their use, we intend to invest the net proceeds from this offering in marketable securities that may include investment-grade
interest-bearing securities, money market accounts, certificates of deposit, commercial paper and guaranteed obligations of the U.S. government.
These investments may not yield a favorable return to our shareholders. If we do not invest or apply the net proceeds from this offering
in ways that enhance shareholder value, we may fail to achieve expected financial results, which could cause our share price to decline.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">We are subject to the continued listing criteria of
the Nasdaq and our failure to satisfy these criteria may result in delisting of the Common Shares.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Our Common Shares are currently listed on the
Nasdaq Global Market under the symbol &ldquo;NB&rdquo;. The public NioCorp Assumed Warrants are currently listed on the Nasdaq Capital
Market under the symbol &ldquo;NIOBW.&rdquo; Nasdaq has rules for continued listing. In order to maintain the listings, we must maintain
certain financial and share distribution targets, including maintaining a minimum number of public shareholders.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">If Nasdaq delists the Common Shares, investors
may face material adverse consequences, including, but not limited to, a lack of a trading market for the Common Shares, reduced liquidity,
a determination that our Common Shares are a &ldquo;penny stock,&rdquo; decreased analyst coverage of the Company, and an inability for
us to obtain additional financing to fund our operations.</P>


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<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">NioCorp may be a &ldquo;passive foreign investment company&rdquo;
for the current taxable year and for one or more future taxable years, which may result in materially adverse U.S. federal income tax
consequences for U.S. investors.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">If NioCorp is a passive foreign investment
company (&ldquo;PFIC&rdquo;) for any taxable year, or portion thereof, that is included in the holding period of a U.S. Holder (as defined
in &ldquo;<I>Certain United States Federal Income Tax Considerations</I>,&rdquo; below) of Common Shares or Pre-Funded Warrants, such
U.S. Holder may be subject to certain adverse U.S. federal income tax consequences and additional reporting requirements. NioCorp believes
that it was classified as a PFIC for its taxable years ended June 30, 2024 and June 30, 2023 and, based on the current composition of
its income and assets, as well as current business plans and financial expectations, may be classified as a PFIC for its current and future
taxable years. Any conclusion regarding PFIC status is a factual determination that must be made annually at the close of each taxable
year and, thus, is subject to change. In addition, even if NioCorp concluded it did not qualify as a PFIC, it is possible that the U.S.
Internal Revenue Service (the &ldquo;IRS&rdquo;) could assert, and that a court could sustain, a determination that NioCorp is a PFIC.
Accordingly, there can be no assurance that NioCorp will not be treated as a PFIC for any taxable year. Each holder of Common Shares or
Pre-Funded Warrants should consult its own tax advisors regarding the PFIC rules and the U.S. federal income tax consequences of the acquisition,
ownership, and disposition of such securities. See &ldquo;<I>Certain United States Federal Income Tax Considerations</I>&rdquo; below,
for further details regarding this issue.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">The 2023 Transactions could result in NioCorp becoming
subject to materially adverse U.S. federal income tax consequences.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Section 7874 and related sections of the U.S.
Internal Revenue Code of 1986, as amended (the &ldquo;Code&rdquo;), provide for certain adverse tax consequences when the stock of a U.S.
corporation is acquired by a non-U.S. corporation in certain transactions in which former shareholders of the U.S. corporation come to
own 60% or more of the stock of the non-U.S. corporation (by vote or value, and applying certain specific counting and ownership rules).
These adverse tax consequences include (i) potential additional required gain recognition by the U.S. corporation, (ii) treatment of certain
payments to the non-U.S. corporation that reduce gross income as &ldquo;base erosion payments,&rdquo; (iii) an excise tax on certain options
and stock-based compensation of the U.S. corporation, (iv) disallowance of &ldquo;qualified dividend&rdquo; treatment for distributions
by the non-U.S. corporation, and (v) if former shareholders of the U.S. corporation come to own 80% or more of the stock of the non-U.S.
corporation, treatment of the non-U.S. corporation as a U.S. corporation subject to U.S. federal income tax on its worldwide income (in
addition to any tax imposed by non-U.S. jurisdictions). If the transactions contemplated by the Business Combination Agreement (as defined
herein) that closed in March 2023, including, among others, the GXII Transaction (as defined herein) and the Yorkville Equity Facility
Financing Agreement (the &ldquo;2023 Transactions&rdquo;) result in the application of any of these, or any other, adverse tax consequences,
NioCorp could incur significant additional tax costs. While NioCorp currently does not believe the 2023 Transactions will cause such adverse
tax consequences as a result of Section 7874 and related sections of the Code, this determination is subject to significant legal and
factual uncertainty. NioCorp has not sought and will not seek any rulings from the IRS as to the tax treatment of any of the 2023 Transactions.
Further, there can be no assurance that your tax advisor, the IRS, or a court, will agree with the position that NioCorp is not subject
to these adverse tax consequences.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">If our Common Shares are considered a penny stock and
are subject to the penny stock rules, broker-dealers may be discouraged from effecting transactions in Common Shares.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Our Common Shares have in the past, and may
in the future, be considered a &ldquo;penny stock.&rdquo; The SEC has adopted Rule 15g-9 which generally defines &ldquo;penny stock&rdquo;
to be any equity security that has a market price (as defined) less than $5.00 per share or an exercise price of less than $5.00 per share,
subject to certain exceptions. Applicable penny stock rules impose additional sales practice requirements on broker-dealers who sell to
persons other than established customers and &ldquo;accredited investors.&rdquo; The term &ldquo;accredited investor&rdquo; refers generally
to institutions with assets in excess of $5.0 million or individuals with a net worth in excess of $1.0 million or annual income exceeding
$200,000 or $300,000, jointly with their spouse. The penny stock rules require a broker-dealer, prior to a transaction in a penny stock
not otherwise exempt from the rules, to deliver a standardized risk disclosure document in a form prepared by the SEC, which provides
information about penny stocks and the nature and level of risks in the penny stock market. The broker-dealer also must provide the customer
with current bid and offer quotations for the penny stock, the compensation of the broker-dealer and its salesperson in the transaction,
and monthly account statements showing the market value of each penny stock held in the customer&rsquo;s account. The bid and offer quotations,
and the broker-dealer and salesperson compensation information, must be given to the customer orally or in writing prior to effecting
the transaction and must be given to the customer in writing before or with the customer&rsquo;s confirmation. In addition, the penny
stock rules require that prior to a transaction in a penny stock not otherwise exempt from these rules, the broker-dealer must make a
special written determination that the penny stock is a suitable investment for the purchaser and receive the purchaser&rsquo;s written
agreement to the transaction. If and when applicable, these disclosure requirements may have the effect of reducing the level of trading
activity in the secondary market for the Common Shares. Consequently, these penny stock rules may affect the ability of broker-dealers
to trade in the Common Shares.</P>


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<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">There is currently no public market for the Pre-Funded
Warrants offered hereby and there is no guarantee that the Pre-Funded Warrants will be listed on any stock exchange.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">There is currently no public market for the
Pre-Funded Warrants offered hereby and there can be no assurance that an active public market will develop or be sustained after completion
of the offering. We do not intend to list the Pre-Funded Warrants for trading on any securities exchange. In the event a public market
for the Pre-Funded Warrants does not develop or cannot be sustained, it is not possible to predict the price at which the Pre-Funded Warrants
will trade in the secondary market or whether such market will be liquid or illiquid. To the extent the Pre-Funded Warrants are exercised,
the number of Pre-Funded Warrants outstanding will decrease, resulting in diminished liquidity for such remaining outstanding Pre-Funded
Warrants. A decrease in the liquidity of the Pre-Funded Warrants may cause, in turn, an increase in the volatility associated with the
price of the Pre-Funded Warrants. To the extent that the Pre-Funded Warrants are or become illiquid, an investor may have to exercise
the Pre-Funded Warrants to realize value.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"><A NAME="a_Hlk195652340"></A>Investors will have no
rights as a shareholder with respect to their Pre-Funded Warrants until they exercise their Pre-Funded Warrants and acquire our Common
Shares.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Until you acquire Common Shares upon exercise
of your Pre-Funded Warrants, you will have no rights with respect to the Common Shares underlying such Pre-Funded Warrants. Upon exercise
of your Pre-Funded Warrants, you will be entitled to exercise the rights of a shareholder only as to matters for which the record date
occurs after the exercise date.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">We will not receive significant additional funds upon
the exercise of the Pre-Funded Warrants being offered.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Each Pre-Funded Warrant may be exercised by
way of a cashless exercise, meaning that the holder may not pay a cash purchase price upon exercise, but instead would receive upon such
exercise the net number of Common Shares determined according to the formula set forth in the Pre-Funded Warrant. Accordingly, we may
not receive any additional funds upon the cashless exercise of the Pre-Funded Warrants or if the Pre-Funded Warrants altogether are not
exercised at all. In addition, the Pre-Funded Warrants have an exercise price of $0.0001 per Common Share, and as a result
we will not receive significant additional funds upon their exercise even if not a cashless exercise.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Significant holders or beneficial holders of our Common
Shares may not be permitted to exercise Pre-Funded Warrants that they hold.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Holders of the Pre-Funded Warrants will not
be entitled to exercise any portion of any Pre-Funded Warrant which, upon giving effect to such exercise, would cause the aggregate number
of Common Shares beneficially owned by the holder (together with its affiliates) to exceed a specified percentage of the number of Common
Shares outstanding immediately after giving effect to the exercise, as such percentage ownership is determined in accordance with the
terms of the Pre-Funded Warrants. As a result, you may not be able to exercise your Pre-Funded Warrants for Common Shares at a time when
it would be financially beneficial for you to do so. In such circumstance, you could seek to sell your Pre-Funded Warrants to realize
value, but you may be unable to do so in the absence of an established trading market for the Pre-Funded Warrants.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">We have never paid dividends on the Common Shares.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We have not paid dividends on the Common Shares
to date, and we may not be in a position to pay dividends for the foreseeable future. Our ability to pay dividends with respect to the
Common Shares will depend on our ability to successfully develop one or more properties and generate earnings from operations. Further,
our initial earnings, if any, will likely be retained to finance our operations. Any future dividends on Common Shares will depend upon
our earnings, our then-existing financial requirements, and other factors, and will be at the discretion of our Board.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Hlk194755262"></A><A NAME="a_Toc194695856"></A><A NAME="a_Toc195656905"></A>Cautionary
Note Regarding Forward-Looking Statements</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">This prospectus supplement, the accompanying
prospectus and the other documents incorporated by reference into this prospectus supplement and the accompanying prospectus contain or
may contain &ldquo;forward-looking statements&rdquo; within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange
Act, and &ldquo;forward-looking information&rdquo; within the meaning of applicable Canadian securities legislation (collectively, &ldquo;forward-looking
statements&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Forward-looking statements have been based
upon our current business and operating plans, as approved by the Company&rsquo;s Board of Directors, and may include statements regarding
the amount and proposed use of the net proceeds from this offering; the size</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">of the offering; the estimated expenses of this offering; the plan
of distribution for this offering; the anticipated effect of this offering on the performance of the Company; the exercise of the over-allotment
option or Pre-Funded Warrants, if any, and the securities issuable thereupon; the anticipated benefits of the 2023 Transactions, including our ability to access
the full amount of the expected net proceeds of the Yorkville Equity Facility Financing Agreement; our ability to receive a final commitment
of financing from the Export-Import Bank of the United States (&ldquo;EXIM&rdquo;); anticipated benefits of the listing of the Common
Shares on Nasdaq; our financial and business performance; our anticipated results and developments in our operations in future periods;
our planned exploration and development activities; the adequacy of our financial resources; our ability to secure sufficient project
financing to complete construction of the Elk Creek Project and move it to commercial operation, including the required financing to get
to a final investment decision; our expectation and ability to produce niobium, scandium, and titanium and the potential to produce rare
earth elements at the Elk Creek Project; our plans to produce and supply specific products and market demand for those products; the outcome
of current recovery process improvement testing and the evaluation of the benefits and costs of electrifying the mine using Railveyor
technology, and our expectation that such process and design improvements could lead to greater efficiencies and cost savings in the Elk
Creek Project, including the twin ramp Railveyor mining design; the Elk Creek Project&rsquo;s ability to produce multiple critical metals;
the Elk Creek Project&rsquo;s projected ore production and mining operations over its expected mine life; the completion of technical
and economic analyses on the potential addition of magnetic rare earth oxides to our planned product suite; updating our technical report
for the Elk Creek Project; statements with respect to the estimation of mineral resources and mineral reserves; the exercise of options
to purchase additional land parcels; the execution of contracts with engineering, procurement and construction companies; the advancement
of offtake discussions with potential customers; our ongoing evaluation of the impact of inflation, supply chain issues and geopolitical
unrest on the Elk Creek Project&rsquo;s economic model; and the creation of full time and contract construction jobs over the construction
period of the Elk Creek Project.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Forward-looking statements are frequently,
but not always, identified by words such as &ldquo;expects,&rdquo; &ldquo;anticipates,&rdquo; &ldquo;believes,&rdquo; &ldquo;intends,&rdquo;
&ldquo;estimates,&rdquo; &ldquo;potential,&rdquo; &ldquo;possible,&rdquo; and similar expressions, or statements that events, conditions,
or results &ldquo;will,&rdquo; &ldquo;may,&rdquo; &ldquo;could,&rdquo; or &ldquo;should&rdquo; (or the negative and grammatical variations
of any of these terms) occur or be achieved. Any statements that express or involve discussions with respect to predictions, expectations,
beliefs, plans, projections, objectives, assumptions, or future events or performance (often, but not always, using words or phrases such
as &ldquo;expects&rdquo; or &ldquo;does not expect,&rdquo; &ldquo;is expected,&rdquo; &ldquo;anticipates&rdquo; or &ldquo;does not anticipate,&rdquo;
&ldquo;plans,&rdquo; &ldquo;estimates,&rdquo; or &ldquo;intends,&rdquo; or stating that certain actions, events, or results &ldquo;may,&rdquo;
&ldquo;could,&rdquo; &ldquo;would,&rdquo; &ldquo;might,&rdquo; or &ldquo;will&rdquo; be taken, occur or be achieved) are not statements
of historical fact and may be forward-looking statements. Forward-looking statements reflect material expectations and assumptions, including,
without limitation, expectations and assumptions relating to: our ability to receive sufficient project financing for the construction
and development of the Elk Creek Project on acceptable terms or at all; the future price of metals; the stability of the financial and
capital markets; our ability to service our debt and meet the payment obligations thereunder and current estimates and assumptions regarding
the 2023 Transactions and their benefits. Such forward-looking statements reflect the Company&rsquo;s current views with respect to future
events and are subject to certain known and unknown risks, uncertainties, and assumptions. Many factors could cause actual results, performance,
or achievements to be materially different from any future results, performance, or achievements that may be expressed or implied by such
forward-looking statements, including, among others, risks related to the following: our ability to consummate this offering; our ability
to use the net proceeds of this offering in a manner that will increase the value of shareholders&rsquo; investment; our ability to operate
as a going concern; our requirement of significant additional capital; our ability to receive sufficient project financing for the construction
of the Elk Creek Project on acceptable terms or at all; our ability to receive a final commitment of financing from EXIM on an acceptable
timeline, on acceptable terms, or at all; our ability to recognize the anticipated benefits of the 2023 Transactions, including our ability
to access the full amount of the expected net proceeds under the Yorkville Equity Facility Financing Agreement; our ability to continue
to meet Nasdaq listing standards; risks relating to the Common Shares, including price volatility, lack of dividend payments and dilution
or the perception of the likelihood of any of the foregoing; the extent to which our level of indebtedness and/or the terms contained
in agreements governing our indebtedness, if any, or the Yorkville Equity Facility Financing Agreement may impair our ability to obtain
additional financing, on acceptable terms, or at all; covenants contained in agreements with our secured creditors that may affect our
assets; our limited operating history; our history of losses; the material weaknesses in our internal control over financial reporting,
our efforts to remediate such material weaknesses and the timing of remediation; the possibility that we may qualify as a PFIC under the
Code; the potential that the 2023 Transactions could result in us becoming subject to materially adverse U.S. federal income tax consequences
as a result of the application of Section 7874 and related sections of the Code; cost increases for our exploration and, if warranted,
development projects; a disruption in, or failure of, our information technology systems, including those related to cybersecurity; equipment
and supply shortages; variations in the market demand for, and prices of, niobium, scandium, titanium and rare earth products; current
and future offtake agreements, joint ventures, and partnerships; our ability to attract qualified management; estimates of mineral resources
and reserves; mineral exploration and production activities; feasibility study results; the results of metallurgical testing; the results
of technological research; changes in demand for and price of commodities (such as fuel and electricity) and currencies; competition in
the mining industry; changes or disruptions in the securities markets; legislative, political or economic developments, including changes
in federal and/or state laws</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">that may significantly affect the mining industry; trade policies
and tensions, including tariffs; inflationary pressures; the impacts of climate change, as well as actions taken or required by governments
related to strengthening resilience in the face of potential impacts from climate change; the need to obtain permits and comply with laws
and regulations and other regulatory requirements; the timing and reliability of sampling and assay data; the possibility that actual
results of work may differ from projections/expectations or may not realize the perceived potential of our projects; risks of accidents,
equipment breakdowns, and labor disputes or other unanticipated difficulties or interruptions; the possibility of cost overruns or unanticipated
expenses in development programs; operating or technical difficulties in connection with exploration, mining, or development activities;
management of the water balance at the Elk Creek Project site; land reclamation requirements related to the Elk Creek Project; the speculative
nature of mineral exploration and development, including the risks of diminishing quantities of grades of reserves and resources; claims
on the title to our properties; potential future litigation; and our lack of insurance covering all of our operations.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Should one or more of these risks or uncertainties
materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those described herein. This list
is not exhaustive of the factors that may affect any of the Company&rsquo;s forward-looking statements. Forward-looking statements are
statements about the future and are inherently uncertain, and actual achievements of the Company or other future events or conditions
may differ materially from those reflected in the forward-looking statements due to a variety of risks, uncertainties, and other factors,
including without limitation those discussed in this prospectus supplement and the accompanying prospectus under the heading &ldquo;<I>Risk
Factors</I>&rdquo; and under Part I, Item 1A. &ldquo;Risk Factors&rdquo; contained in our most recent Annual Report on Form 10-K, and
Part II, Item 1A. &ldquo;Risk Factors&rdquo; contained in our subsequent Quarterly Reports on Form 10-Q, as well as any amendments thereto,
which are incorporated by reference into this prospectus supplement and the accompanying prospectus in their entirety, together with other
information in this prospectus supplement and the accompanying prospectus and the documents incorporated by reference herein and therein.
See the sections of this prospectus supplement entitled &ldquo;<I>Where You Can Find More Information</I>&rdquo; and &ldquo;<I>Incorporation
of Documents by Reference</I>.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The Company&rsquo;s forward-looking statements
contained in this prospectus supplement are based on the beliefs, expectations, and opinions of management as of the date of this prospectus
supplement. The Company does not assume any obligation to update forward-looking statements if circumstances or management&rsquo;s beliefs,
expectations, or opinions should change, except as required by law. For the reasons set forth above, investors should not attribute undue
certainty to, or place undue reliance on, forward-looking statements.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Toc194695857"></A><A NAME="a_Toc195656906"></A>Use
of Proceeds</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We estimate that the net proceeds from the
sale of the Common Shares and the Pre-Funded Warrants offered hereby, after deducting underwriting discounts and commissions and estimated
offering expenses payable by us but before giving effect to the exercise of any Pre-Funded Warrants, will be approximately $18.1 million ($20.9 million if the underwriter exercises its over-allotment option to purchase Option
Shares in full).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We expect to use the net proceeds from this
offering for working capital and general corporate purposes, including to advance our efforts to launch construction of the Elk Creek
Project and move it to commercial operation.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Toc194695858"></A><A NAME="a_Toc195656907"></A>Dilution</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">If you invest in our Common Shares and Pre-Funded
Warrants in this offering, your interest will be diluted immediately to the extent of the difference between the offering price per Common
Share (or Pre-Funded Warrant in lieu thereof) and the adjusted net tangible book value per Common Share after this offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Our net tangible book value as of December
31, 2024, was approximately $8.2 million, or $0.19 per Common Share, based upon the number of Common Shares outstanding as of that date.
Net tangible book value per share is determined by dividing our total tangible assets, less total liabilities, by the number of Common
Shares outstanding. Dilution in net tangible book value per share represents the difference between the amount per share paid by purchasers
of Common Shares in this offering and the net tangible book value per Common Share immediately after this offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">After giving effect to the sale by us of 6,628,846
Common Shares at the offering price of $2.60 per Common Share and 1,063,462 Pre-Funded Warrants at the offering price of $2.5999 per Pre-Funded Warrant and
after deducting underwriting discounts and commissions and estimated offering expenses payable by us but before giving effect to the exercise
of any Pre-Funded Warrants, our as-adjusted net tangible book value as of December 31, 2024 would have been approximately $26.3 million,
or $0.51 per Common Share. This represents an immediate increase in the net tangible
book value of $0.32 per Common Share to our existing shareholders and an immediate
and</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">substantial dilution in net tangible book value of $2.09 per
Common Share to new investors purchasing our Common Shares in this offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The following table illustrates this per Common
Share dilution:</P>


<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-right: 5.4pt; padding-left: 25pt; text-indent: -19pt; vertical-align: top">Offering price per Common Share (or Pre-Funded Warrant in lieu thereof at the public offering price less $0.0001)</TD><TD STYLE="text-align: left; vertical-align: top">&nbsp;</TD>
    <TD STYLE="text-align: left; vertical-align: top">&thinsp;</TD>
    <TD STYLE="text-align: right; vertical-align: top"></TD>
    <TD STYLE="text-align: left; vertical-align: top">&nbsp;</TD><TD STYLE="text-align: left; vertical-align: top">&nbsp;</TD>
    <TD STYLE="text-align: left; vertical-align: top">$</TD>
    <TD STYLE="text-align: left; vertical-align: top">&nbsp;</TD>
    <TD STYLE="text-align: right; vertical-align: top">2.60</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-right: 5.4pt; width: 69%; text-indent: -19pt; padding-left: 25pt; vertical-align: top">Net tangible book value per Common Share as of December 31, 2024</TD><TD STYLE="text-align: left; width: 2%; vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 1%; text-align: left">$</TD><TD STYLE="vertical-align: top; width: 11%; text-align: right">0.19</TD><TD STYLE="vertical-align: top; width: 1%; text-align: left">&nbsp;</TD><TD STYLE="text-align: left; width: 3%; vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 1%; text-align: left">&nbsp;</TD><TD STYLE="vertical-align: top; width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">&thinsp;</FONT></TD><TD STYLE="vertical-align: top; width: 11%; text-align: right">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top; padding-right: 5.4pt; text-align: left; text-indent: -19pt; padding-left: 25pt">Increase in net
    tangible book value per Common Share attributable to this offering</TD><TD STYLE="text-align: left; vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: left">$</TD><TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font-size: 10pt">0.32</FONT></TD><TD STYLE="vertical-align: top; text-align: left">&nbsp;</TD><TD STYLE="text-align: left; vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: left">&nbsp;</TD><TD STYLE="vertical-align: top; text-align: left"><FONT STYLE="font-size: 10pt">&thinsp;</FONT></TD><TD STYLE="vertical-align: top; text-align: right">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="vertical-align: top; padding-right: 5.4pt; text-align: left; text-indent: -19pt; padding-left: 25pt">As adjusted net tangible book value per Common Share as of December 31, 2024, after giving effect to this offering</TD><TD STYLE="text-align: left; vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: left">&nbsp;</TD><TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font-size: 10pt">&thinsp;</FONT></TD><TD STYLE="vertical-align: top; text-align: left">&nbsp;</TD><TD STYLE="text-align: left; vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: left">$</TD><TD STYLE="vertical-align: top; text-align: left"><FONT STYLE="font-size: 10pt"></FONT></TD><TD STYLE="vertical-align: top; text-align: right">0.51</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top; padding-right: 5.4pt; text-align: left; text-indent: -19pt; padding-left: 25pt">Dilution per Common Share to new investors purchasing Common Shares in this offering</TD><TD STYLE="text-align: left; vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: left">&nbsp;</TD><TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font-size: 10pt">&thinsp;</FONT></TD><TD STYLE="vertical-align: top; text-align: left">&nbsp;</TD><TD STYLE="text-align: left; vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: left">$</TD><TD STYLE="vertical-align: top; text-align: left"><FONT STYLE="font-size: 10pt"></FONT></TD><TD STYLE="vertical-align: top; text-align: right">2.09</TD></TR>
  </TABLE>
<P STYLE="margin-top: 0; margin-bottom: 0">&nbsp;</P>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The above discussion and table are based on
43,671,287 Common Shares outstanding as of December 31, 2024 and excludes the following securities:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>the Option Shares;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>Common Shares issuable upon exercise of any Pre-Funded Warrants offered hereby;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>Common Shares issuable upon exercise of outstanding stock options under the LTIP;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>Common Shares reserved for future issuance under the LTIP;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>Common Shares issuable in respect of the commitment amount under the Yorkville Equity Facility Financing Agreement, including the
Advance Shares;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>an aggregate of 7,325,627 Common Shares issuable under certain conditions upon exchange of shares of Class B common stock of ECRC;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>an aggregate of 17,519,864 Common Shares issuable upon exercise of NioCorp Assumed Warrants;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>an aggregate of 13,804,069 Common Shares issuable upon exercise of other  Common Share purchase warrants outstanding as of April 14, 2025 with a weighted-average
exercise price of approximately $2.15; and</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>Common Shares issued since December 31, 2024, including Common Shares issued in connection with the Company&rsquo;s underwritten registered
direct offering that closed on January 31, 2025 and under the Yorkville Equity Facility Financing Agreement.</TD></TR></TABLE>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Toc194695859"></A><A NAME="a_Toc195656908"></A>Description
of Securities</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Common Shares</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The authorized capital of the Company consists
of an unlimited number of Common Shares, without par value. The holders of Common Shares are entitled to receive notice of and attend
all meetings of shareholders, with each Common Share held entitling the holder to one (1) vote on any resolution to be passed at such
shareholder meetings. The holders of Common Shares are entitled to dividends if, as and when declared by the Company&rsquo;s Board of
Directors. The Common Shares are entitled, upon liquidation, dissolution, or winding up of the Company, to receive the remaining assets
of the Company available for distribution to shareholders. There are no pre-emptive, conversion, or redemption rights attached to the
Common Shares.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Exchange Controls</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">There are no governmental laws, decrees, or
regulations in Canada that restrict the export or import of capital, including foreign exchange controls, or that affect the remittance
of dividends, interest or other payments to non-resident holders of the securities of the Company, other than as discussed below and Canadian
withholding tax. See &ldquo;<I>Certain Canadian Federal Income Tax Considerations for U.S. Residents</I>&rdquo; below.</P>


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<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Competition Act</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Limitations on the ability to acquire and hold
Common Shares may be imposed by the Competition Act (Canada). This legislation permits the Commissioner of Competition of Canada (the
&ldquo;Commissioner&rdquo;) to review any acquisition of a significant interest in the Company. This legislation grants the Commissioner
jurisdiction to challenge such an acquisition before the Canadian Competition Tribunal if the Commissioner believes that it would, or
would be likely to, result in a substantial lessening or prevention of competition in any market in Canada.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Investment Canada Act</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The Investment Canada Act subjects an acquisition
of control of a Canadian business by a non-Canadian to government notification or review depending on whether the relevant financial threshold
(based on enterprise value or asset value of the company), as calculated pursuant to the legislation, exceeds a threshold amount. A reviewable
acquisition may not proceed unless the relevant minister is satisfied that the investment is likely to result in a net benefit to Canada.
Under the national-security-review regime in the Investment Canada Act, review on a discretionary basis may also be undertaken by the
federal government in respect of a broad range of investments by a non-Canadian. No financial threshold applies to a national security
review. The relevant test is whether such investment by a non-Canadian could be &ldquo;injurious to national security.&rdquo;</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Warrants</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">From time to time, the Company has outstanding
Common Share purchase warrants, with each Common Share purchase warrant exercisable for one Common Share. The exercise price per Common
Share and the number of Common Shares issuable upon exercise of Common Share purchase warrants is subject to adjustment upon the occurrence
of certain events, including, but not limited to, the following:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>the subdivision or re-division of the outstanding Common Shares into a greater number of Common Shares;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>the reduction, combination or consolidation of the outstanding Common Shares into a lesser number of Common Shares;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>the issuance of Common Shares or securities exchangeable for, or convertible into, Common Shares to all or substantially all of the
holders of Common Shares by way of stock dividend or other distribution (other than a distribution of Common Shares upon the exercise
of Common Share purchase warrants or any outstanding options);</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>the reorganization of the Company or the consolidation or merger or amalgamation of the Company with or into another corporate body;
and</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>a reclassification or other similar change to the outstanding Common Shares.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The Company will issue the Common Shares issuable
upon exercise of Common Share purchase warrants within five business days following its receipt of notice of exercise and payment of the
exercise price, subject to surrender of the Common Share purchase warrants. Prior to the exercise of any Common Share purchase warrants,
holders of the Common Share purchase warrants will not have any of the rights of holders of the Common Shares issuable upon exercise,
including the right to vote or to receive any payments of dividends on the Common Shares issuable upon exercise.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">NioCorp Assumed Warrants</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">On March 17, 2023 (the &ldquo;Closing Date&rdquo;),
the Company closed a series of transactions (the &ldquo;GXII Transaction&rdquo;) pursuant to the Business Combination Agreement, dated
as of September 25, 2022 (the &ldquo;Business Combination Agreement&rdquo;), by and among the Company, GX Acquisition Corp. II, a Delaware
corporation (&ldquo;GXII&rdquo;), and Big Red Merger Sub Ltd., a Delaware corporation and a direct, wholly owned subsidiary of the Company.
In connection with the closing of the GXII Transaction (the &ldquo;Closing&rdquo;), pursuant to the Business Combination Agreement, the
Company assumed GXII&rsquo;s obligations under the Warrant Agreement, dated as of March 17, 2021 (the &ldquo;GXII Warrant Agreement&rdquo;),
by and between GXII and Continental Stock Transfer &amp; Trust Company (&ldquo;CST&rdquo;), as warrant agent, and each share purchase
warrant of GXII thereunder (the &ldquo;GXII Warrants&rdquo;) that was issued and outstanding immediately prior to the Closing Date was
converted into one Common Share purchase warrant (the &ldquo;NioCorp Assumed Warrants&rdquo;) pursuant to the GXII Warrant Agreement,
as amended by an Assignment, Assumption and Amendment Agreement, dated the Closing Date (the GXII Warrant Agreement, as so amended, the
&ldquo;NioCorp Assumed Warrant Agreement&rdquo;), among the Company, GXII, CST, as existing warrant agent, and Computershare Inc. and
its affiliate Computershare Trust Company, N.A, together as successor warrant agent (the</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">&ldquo;NioCorp Assumed Warrant Agent&rdquo;). In connection with
the Closing, NioCorp issued (a) 9,999,959 public NioCorp Assumed Warrants in respect of the GXII Warrants that were publicly traded prior
to the Closing and (b) 5,666,667 NioCorp Assumed Warrants to GX Sponsor II LLC (the &ldquo;Sponsor&rdquo;) in respect of the GXII Warrants
that it held prior to the Closing, which NioCorp Assumed Warrants were subsequently distributed by the Sponsor to its members in connection
with the Closing.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Both the public NioCorp Assumed Warrants and
the NioCorp Assumed Warrants issued to the Sponsor are subject to the terms of the NioCorp Assumed Warrant Agreement and are identical,
with certain exceptions applicable to the NioCorp Assumed Warrants issued to the Sponsor for so long as such NioCorp Assumed Warrants
are held by the Sponsor, its members, or their respective affiliates and other permitted transferees. In accordance with the NioCorp Assumed
Warrant Agreement, any NioCorp Assumed Warrants issued to the Sponsor that are held by someone other than the Sponsor, its members, or
their respective affiliates and other permitted transferees, are treated as public NioCorp Assumed Warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Each NioCorp Assumed Warrant is exercisable
on and after April 16, 2023 until its expiration for 1.11829212 Common Shares at a price of $11.50 per 1.11829212 Common Shares (subject
to adjustments for stock splits, stock dividends, reorganizations, recapitalizations and the like). Under the terms of NioCorp Assumed
Warrant Agreement, for so long as the NioCorp Assumed Warrants issued to the Sponsor are held by the Sponsor, its members, or their respective
affiliates and other permitted transferees, such holders have the right to elect to exercise those NioCorp Assumed Warrants on a cashless
basis. For such NioCorp Assumed Warrants exercised on a cashless basis after the Closing, the holder will be entitled to pay the exercise
price for those NioCorp Assumed Warrants by surrendering all or portion of the cash and/or Common Shares (valued at their fair market
value) into which those NioCorp Assumed Warrants are exercisable as shall be elected by the holder. For this purpose, Common Shares so
surrendered will be deemed to have a &ldquo;fair market value&rdquo; equal to the average reported last sale price of the Common Shares
for the 10 trading days ending on the third trading day prior to the date of exercise of the applicable NioCorp Assumed Warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The NioCorp Assumed Warrants will expire at
5:00 p.m., New York City time, on March 17, 2028 or earlier upon redemption or liquidation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The Company will not be obligated to deliver
any Common Shares pursuant to the exercise of a NioCorp Assumed Warrant and will have no obligation to settle such exercise unless a registration
statement under the Securities Act with respect to the Common Shares underlying the NioCorp Assumed Warrants is then effective and a prospectus
relating thereto is current, subject to the Company satisfying its obligations described below with respect to registration. No NioCorp
Assumed Warrant will be exercisable and the Company will not be obligated to issue Common Shares upon exercise of a NioCorp Assumed Warrant
unless Common Shares issuable upon such exercise have been registered, qualified or deemed to be exempt under the securities laws of the
state of residence of the registered holder of the NioCorp Assumed Warrants. In the event that the conditions in the two immediately preceding
sentences are not satisfied with respect to a NioCorp Assumed Warrant, the holder of such NioCorp Assumed Warrant will not be entitled
to exercise such NioCorp Assumed Warrant and such NioCorp Assumed Warrant may have no value and expire worthless. In no event will the
Company be required to net cash settle any NioCorp Assumed Warrant.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The NioCorp Assumed Warrants, and the underlying
Common Shares issuable upon the exercise thereof, were registered under the Securities Act pursuant to the Company&rsquo;s registration
statement on Form S-4, originally filed on November 7, 2022, as subsequently amended, which was declared effective by the SEC on February
8, 2023. The ongoing registered offering of the Common Shares underlying the NioCorp Assumed Warrants is being conducted pursuant to the
Company&rsquo;s registration statement on Form S-3, originally filed on April 14, 2023, as subsequently post-effectively amended to convert
such registration statement to Form S-1, which was declared effective on October 30, 2023.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The Company will have the right to call the
public NioCorp Assumed Warrants for redemption at any time following the Closing Date:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>in whole and not in part;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>at a price of $0.01 per NioCorp Assumed Warrant;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>upon not less than 30 days&rsquo; prior written notice of redemption (the &ldquo;30-day redemption period&rdquo;) to each public NioCorp
Assumed Warrant holder;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>if, and only if, the reported last sale price of the Common Shares equals or exceeds approximately $16.10 per share (subject to certain
adjustments) for any 20 trading days within a 30-trading day period commencing once the NioCorp Assumed</TD></TR></TABLE>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt 0.5in">Warrants become exercisable and ending three business days
before the Company sends the notice of redemption to the public NioCorp Assumed Warrant holders; and</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>if there is an effective registration statement covering the Common Shares issuable upon exercise of the NioCorp Assumed Warrants,
and a current prospectus relating thereto, available throughout the 30-day redemption period.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The NioCorp Assumed Warrants issued to the
Sponsor are not redeemable by the Company for so long as such NioCorp Assumed Warrants are held by the Sponsor, its members, or their
respective affiliates or other permitted transferees. In addition, the Company may not exercise its redemption right if the issuance of
Common Shares upon exercise of the NioCorp Assumed Warrants is not exempt from registration or qualification under applicable state blue
sky laws or the Company is unable to effect such registration or qualification.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">If the Company calls the public NioCorp Assumed
Warrants for redemption as described above, the Company will have the option to require any holder that wishes to exercise its public
NioCorp Assumed Warrant to do so on a &ldquo;cashless basis.&rdquo; In determining whether to require all holders to exercise their public
NioCorp Assumed Warrants on a &ldquo;cashless basis,&rdquo; the Company will consider, among other factors, its cash position, the number
of NioCorp Assumed Warrants that are outstanding and the dilutive effect on the Company&rsquo;s shareholders of issuing the maximum number
of Common Shares issuable upon the exercise of the NioCorp Assumed Warrants. If the Company takes advantage of this option, all holders
of public NioCorp Assumed Warrants would pay the exercise price by surrendering their NioCorp Assumed Warrants for that number of Common
Shares equal to the quotient obtained by dividing (x) the product of the number of Common Shares underlying the public NioCorp Assumed
Warrants, multiplied by the difference between the exercise price of the NioCorp Assumed Warrants and the &ldquo;fair market value&rdquo;
(defined below) by (y) the fair market value. The &ldquo;fair market value&rdquo; shall mean the average reported last sale price of the
Common Shares for the 10 trading days ending on the third trading day prior to the date on which the notice of redemption is sent to the
holders of public NioCorp Assumed Warrants. If the Company takes advantage of this option, the notice of redemption will contain the information
necessary to calculate the number of Common Shares to be received upon exercise of the NioCorp Assumed Warrants, including the &ldquo;fair
market value&rdquo; in such case. Requiring a cashless exercise in this manner will reduce the number of Common Shares to be issued and
thereby lessen the dilutive effect of a redemption of the public NioCorp Assumed Warrants. If the Company calls the public NioCorp Assumed
Warrants for redemption and does not take advantage of this option, the Sponsor, its members, and their respective affiliates and other
permitted transferees would still be entitled to exercise their NioCorp Assumed Warrants for cash or on a cashless basis using the same
formula described above that other NioCorp Assumed Warrant holders would have been required to use had all NioCorp Assumed Warrant holders
been required to exercise their NioCorp Assumed Warrants on a cashless basis, as described in more detail below.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A holder of a NioCorp Assumed Warrant may notify
the Company in writing in the event it elects to be subject to a requirement that such holder will not have the right to exercise such
NioCorp Assumed Warrant, to the extent that after giving effect to such exercise, such holder (together with such holder&rsquo;s affiliates),
to the NioCorp Assumed Warrant Agent&rsquo;s actual knowledge, would beneficially own in excess of 4.9% or 9.8% (or such other amount
as a holder may specify) of the Common Shares outstanding immediately after giving effect to such exercise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The NioCorp Assumed Warrants have certain anti-dilution
and adjustments rights upon certain events.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The NioCorp Assumed Warrants may be exercised
upon surrender of the certificate representing such NioCorp Assumed Warrants on or prior to the expiration date at the offices of the
NioCorp Assumed Warrant Agent, with the exercise form on the reverse side of such certificate completed and executed as indicated, accompanied
by full payment of the exercise price (or on a cashless basis, if applicable), by certified or official bank check payable to the order
of the NioCorp Assumed Warrant Agent or by wire transfer, for the number of NioCorp Assumed Warrants being exercised. The NioCorp Assumed
Warrant holders will not have the rights or privileges of holders of Common Shares or any attendant voting rights until they exercise
their NioCorp Assumed Warrants and receive Common Shares. After the issuance of Common Shares upon exercise of the NioCorp Assumed Warrants,
each holder will be entitled to one (1) vote for each Common Share held of record on all matters to be voted on by NioCorp shareholders.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">If, upon exercise of the NioCorp Assumed Warrants,
a holder would be entitled to receive a fractional interest in a share, the Company will, upon exercise, round down to the nearest whole
number of Common Shares to be issued to the NioCorp Assumed Warrant holder.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The NioCorp Assumed Warrants were issued in
registered form under the NioCorp Assumed Warrant Agreement. The NioCorp Assumed Warrant Agreement may be amended by the parties thereto
without the consent of any registered holder (i) for the purpose of curing any ambiguity, or curing, correcting or supplementing any mistake,
or adding or changing any other provisions with respect</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">to matters or questions arising under NioCorp Assumed Warrant Agreement
as the parties may deem necessary or desirable and that the parties deem shall not adversely affect the interest of the registered holders
of the NioCorp Assumed Warrants, and (ii) to provide for the delivery of such kind and amount of Common Shares or other securities or
property (including cash) receivable upon a reclassification, reorganization, merger or consolidation, or upon a dissolution following
any such sale or transfer, that the holder of NioCorp Assumed Warrants would have received if such holder had exercised his, her or its
NioCorp Assumed Warrants immediately prior to such event. All other modifications or amendments, including any amendment to increase the
warrant price or shorten the exercise period, shall require the vote or written consent of the registered holders of a majority of the
then outstanding public NioCorp Assumed Warrants. Any amendment solely to the NioCorp Assumed Warrants issued to the Sponsor and that
are held by the Sponsor, its members, or their respective affiliates or other permitted transferees, shall require the vote or written
consent of a majority of the holders of the then outstanding NioCorp Assumed Warrants issued to the Sponsor.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Pre-Funded Warrants to Be Issued in this Offering</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The following is a brief summary of certain
terms and conditions of the Pre-Funded Warrants being offered by this prospectus supplement. The following description is qualified in
its entirety by reference to the provisions contained in the Pre-Funded Warrants. The Pre-Funded Warrants will be issued in certificated
form.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The Pre-Funded Warrants will be exercisable
at any time on or after their original issuance and will not expire until they are exercised in full. The Pre-Funded Warrants will be
exercisable, at the option of each holder, in whole or in part, by delivering to the Company a duly executed exercise notice and by payment
in full in immediately available funds for the number of Common Shares purchased upon such exercise. The holder of a Pre-Funded Warrant
may also satisfy its obligation to pay the exercise price through a &ldquo;cashless exercise&rdquo; in which the holder receives the net
value of the Pre-Funded Warrant in Common Shares determined according to the formula set forth in the Pre-Funded Warrant. No fractional
Common Shares will be issued in connection with the exercise of a Pre-Funded Warrant. If, upon the exercise of a Pre-Funded Warrant, a
holder would be entitled to receive a fractional interest in a Common Share, we will round down to the nearest whole number of Common
Shares to be issued to the holder upon such exercise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Each Pre-Funded Warrant is exercisable for
one Common Share. The exercise price per whole Common Share purchasable upon the exercise of the Pre-Funded Warrants is $0.0001 per
Common Share (the &ldquo;Exercise Price&rdquo;). The Exercise Price is subject to appropriate adjustment in the event of certain stock
dividends and distributions, stock splits, stock combinations, reclassifications or similar events affecting our Common Shares and also
upon any distributions of assets, including cash, stock or other property to all of our shareholders.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A holder will not have the right to exercise
any portion of its Pre-Funded Warrants if the holder (together with its affiliates) would beneficially own in excess of 4.99%, or 9.99%
upon notice by the holder, of the number of our Common Shares outstanding immediately after giving effect to the exercise, as such percentage
ownership is determined in accordance with the terms of the Pre-Funded Warrants. However, any holder may increase or decrease such percentage
to any other percentage upon at least 61 days&rsquo; prior notice from the holder to us.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We do not plan on applying to list the Pre-Funded
Warrants on Nasdaq or any other national securities exchange or other nationally recognized trading system.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Subject to applicable laws, the Pre-Funded
Warrants may be offered for sale, sold, transferred or assigned without our consent.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In the event of a fundamental transaction,
as described in the Pre-Funded Warrants and generally including our merger, amalgamation or consolidation with our into another person,
the sale, transfer, conveyance or other disposition of all or substantially all of our assets, the completion of a purchase offer, tender
offer or exchange offer for Common Shares that is accepted by the holders of 50% or more of the outstanding Common Shares, a reclassification
of our Common Shares, or the consummation by us of a stock or share purchase agreement or other business combination (including, without
limitation, a reorganization, recapitalization, spin-off, merger, amalgamation or arrangement) with another person or group of persons
whereby such other person or group acquires more than 50% of the outstanding Common Shares, the holders of the Pre-Funded Warrants will
be entitled to receive upon exercise of the Pre-Funded Warrants the kind and amount of securities, cash or other property that the holders
would have received had they exercised the Pre-Funded Warrants immediately prior to such fundamental transaction.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Pre-Funded Warrant holders will not have the
rights or privileges of a holder of our Common Shares with respect to the Common Shares underlying such Pre-Funded Warrants, including
any voting rights, until the holder exercises such Pre-Funded Warrants.</P>


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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Toc195656909"></A><A NAME="a_Toc194695861"></A>
Certain United States Federal Income Tax Considerations</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The following is a general summary of certain
U.S. federal income tax considerations applicable to a U.S. Holder (as defined below) arising from and relating to (i) the acquisition,
ownership, and disposition of Common Shares issued pursuant to this offering (the &ldquo;Shares&rdquo;), (ii) the acquisition, ownership
and disposition of Pre-Funded Warrants, and (iii) the acquisition, ownership, and disposition of Common Shares received upon exercise
of Pre-Funded Warrants (the &ldquo;Warrant Shares&rdquo;). The Shares, the Pre-Funded Warrants and the Warrant Shares are collectively
referred to herein as &ldquo;Offered Securities.&rdquo; This summary is for general information purposes only and does not purport to
be a complete analysis or listing of all potential U.S. federal income tax considerations that may apply to a U.S. Holder of Offered Securities.
In addition, this summary does not take into account the individual facts and circumstances of any particular U.S. Holder that may affect
the U.S. federal income tax consequences to such U.S. Holder, including, without limitation, specific tax consequences to a U.S. Holder
under an applicable income tax treaty. Accordingly, this summary is not intended to be, and should not be construed as, legal or U.S.
federal income tax advice with respect to any U.S. Holder. This summary does not address any tax consequences to U.S. Holders arising
from the U.S. federal alternative minimum tax or the Medicare tax on investment income, U.S. federal estate, gift and other non-income
taxes, U.S. state and local taxes, or any non-U.S. tax. In addition, except as specifically set forth below, this summary does not discuss
applicable tax reporting requirements. Each prospective U.S. Holder should consult its own tax advisors regarding the U.S. federal, U.S.
federal alternative minimum, U.S. federal net investment income, U.S. federal estate and gift, U.S. state and local, and non-U.S. tax
considerations relevant to the Offered Securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">No legal opinion from legal counsel or ruling
from the IRS has been requested, or will be obtained, regarding the U.S. federal income tax considerations relevant to the Offered Securities.
This summary is not binding on the IRS, and the IRS is not precluded from taking a position that is different from, and contrary to, the
positions taken in this summary. In addition, because the authorities on which this summary is based are subject to various interpretations,
the IRS and the U.S. courts could disagree with one or more of the conclusions described in this summary.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Scope of this Summary</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Authorities</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">This summary is based on the Code, Treasury
Regulations (whether final, temporary, or proposed), published rulings and administrative positions of the IRS, the Convention Between
Canada and the United States of America with Respect to Taxes on Income and on Capital, signed September 26, 1980, as amended (the &ldquo;Canada-U.S.
Tax Convention&rdquo;), and U.S. court decisions that are applicable, and, in each case, as in effect and available, as of the date of
this document. Any of the authorities on which this summary is based could be changed in a material and adverse manner at any time, and
any such change could be applied retroactively. This summary does not discuss the potential effects, whether adverse or beneficial, of
any proposed legislation.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">U.S. Holders</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">For purposes of this summary, the term &ldquo;U.S.
Holder&rdquo; means a beneficial owner of any Offered Securities that is for U.S. federal income tax purposes:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>an individual who is a citizen or resident of the United States;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>a corporation (or other entity treated as a corporation for U.S. federal income
tax purposes) organized under the laws of the United States, any state thereof or the District of Columbia;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>an estate whose income is subject to U.S. federal income taxation regardless
of its source; or</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>a trust that (1) is subject to the primary supervision of a court within the
U.S. and the control of one or more U.S. persons for all substantial decisions or (2) has a valid election in effect under applicable
Treasury Regulations to be treated as a U.S. person.</TD></TR></TABLE>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">&nbsp;</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">U.S. Holders Subject to Special U.S. Federal Income
Tax Rules Not Addressed</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">This summary does not address the U.S. federal
income tax considerations applicable to U.S. Holders that are subject to special provisions under the Code, including, but not limited
to, U.S. Holders that: (a) are tax-exempt organizations, qualified retirement plans, individual retirement accounts, or other tax-deferred
accounts; (b) are financial institutions, underwriters, insurance companies, real estate investment trusts, regulated investment companies,
or S corporations (or S corporation shareholders); (c) are broker-dealers, dealers, or traders in securities or currencies that elect
to apply a mark-to-market accounting method; (d) have a &ldquo;functional currency&rdquo; other than the U.S. dollar; (e) own Offered
Securities as part of a straddle, hedging transaction, conversion transaction, constructive sale, or other arrangement involving more
than one position; (f) acquire Offered Securities in connection with the exercise of employee stock options or otherwise as compensation
for services; (g) hold Offered Securities other than as a capital asset within the meaning of Section 1221 of the Code (generally, property
held for investment purposes); (h) hold Offered Securities in connection with a trade or business, permanent establishment, or fixed base
outside the United States; or (i) own, have owned or will own (directly, indirectly, or by attribution) 10% or more of the total combined
voting power or value of the outstanding equity of the Company. This summary also does not address any tax considerations applicable to
U.S. Holders who are: (a) U.S. expatriates or former long-term residents of the U.S.; (b) persons that have been, are, or will be a resident
or deemed to be a resident in Canada for purposes of the Income Tax Act (Canada) and the regulations enacted thereunder (the &ldquo;Canadian
Tax Act&rdquo;); (c) persons that use or hold, will use or hold, or that are or will be deemed to use or hold Offered Securities in connection
with carrying on a business in Canada; (d) persons whose Offered Securities constitute &ldquo;taxable Canadian property&rdquo; under the
Canadian Tax Act; or (e) persons that have a permanent establishment in Canada for the purposes of the Canada-U.S. Tax Convention. U.S.
Holders that are subject to special provisions under the Code, including, but not limited to, U.S. Holders described immediately above,
should consult their own tax advisors regarding the tax considerations relevant to the Offered Securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">If an entity or arrangement that is classified
as a partnership (or other &ldquo;pass-through&rdquo; entity) for U.S. federal income tax purposes holds Offered Securities, the U.S.
federal income tax consequences to such entity or arrangement and the partners (or other owners or participants) of such entity or arrangement
generally will depend on the activities of the entity or arrangement and the status of such partners (or owners or participants). This
summary does not address the tax consequences to any such partner (or owner or participant). Partners (or other owners or participants)
of entities or arrangements that are classified as partnerships or as &ldquo;pass-through&rdquo; entities for U.S. federal income tax
purposes should consult their own tax advisors regarding the U.S. federal income tax considerations relevant to the Offered Securities.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Treatment of Pre-Funded Warrants</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Although it is not free from doubt, the Company
believes that a Pre-Funded Warrant is best treated as a share of the Company for U.S. federal income tax purposes and, on this basis,
a U.S. Holder of Pre-Funded Warrants would generally be taxed in the same manner as a holder of Shares except as described below. No gain
or loss would be recognized upon the exercise of a Pre-Funded Warrant and, upon exercise, the holding period of a Pre-Funded Warrant would
carry over to the Warrant Share(s) received. Similarly, the tax basis of the Pre-Funded Warrant would carry over to the Warrant Share(s)
received upon exercise, increased by the exercise price of $0.0001 per share. However, such characterization is not binding on the IRS,
and the IRS may instead treat the Pre-Funded Warrants as warrants to acquire Shares. If so, the amount and character of a U.S. Holder's
gain with respect to an investment in Pre-Funded Warrants could change, and a U.S. Holder would not be entitled to make the &ldquo;QEF
Election&rdquo; described below with respect to the Pre-Funded Warrants to mitigate PFIC consequences. Accordingly, each U.S. Holder should
consult its own tax advisor regarding the risks associated with the acquisition of a Pre-Funded Warrant pursuant to this offering (including
potential alternative characterizations and the availability of relevant elections). The balance of this summary generally assumes that
the characterization described above is respected for U.S. federal income tax purposes.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Certain Adjustments to the Pre-Funded Warrants</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The terms of each Pre-Funded Warrant provide
for an adjustment to the number of Warrant Shares for which the Pre-Funded Warrant may be exercised or to the exercise price of the Pre-Funded
Warrant in certain events. An adjustment which has the effect of preventing dilution generally is not taxable. A U.S. Holder of a Pre-Funded
Warrant would, however, be treated as receiving a constructive distribution from the Company if, for example, the adjustment increases
the holder&rsquo;s proportionate interest in the Company&rsquo;s assets or earnings and profits as a result of a distribution of cash
or other property such as other securities to the holders of the Shares which is taxable to the U.S. Holders of such shares as described
under &ldquo;&mdash;<I>General Rules Applicable to the Ownership and Disposition of Offered Securities</I>&mdash;<I>Distributions on Shares
or Warrant Shares</I>&rdquo; below. Such a constructive distribution would generally be subject to tax as described under that section
in the same manner as if the U.S. Holder of such Pre-Funded Warrant received a cash distribution from the Company equal to the fair market
value of such increased interest.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">General Rules Applicable to the Ownership and Disposition of
Offered Securities</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Distributions on Shares or Warrant Shares</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A U.S. Holder that receives a distribution,
including a constructive distribution, with respect to a Share or Warrant Share will be required to include the amount of such distribution
in gross income as a dividend (without reduction for any Canadian income tax withheld from such distribution) to the extent of the current
and accumulated &ldquo;earnings and profits&rdquo; of the Company, as computed for U.S. federal income tax purposes. To the extent that
a distribution exceeds the current and accumulated &ldquo;earnings and profits&rdquo; of the Company, such distribution will be treated,
first, as a tax-free return of capital to the extent of a U.S. Holder&rsquo;s tax basis in the Shares or Warrant Shares and thereafter
as gain from the sale or exchange of such Shares or Warrant Shares. However, the Company may not maintain the calculations of its earnings
and profits in accordance with U.S. federal income tax principles, and U.S. Holders may have to assume that any distribution by the Company
with respect to the Shares or Warrant Shares will constitute ordinary dividend income in its entirety. Dividends received on Shares or
Warrant Shares by a corporate U.S. Holder (other than certain 10% corporate shareholders) generally will not be eligible for a &ldquo;dividends
received deduction.&rdquo; Provided that (1) the Company is eligible for the benefits of the Canada-U.S. Tax Convention or (2) the Shares
and Warrant Shares are readily tradable on a United States securities market (and certain holding period and other conditions are satisfied),
dividends paid by the Company to non-corporate U.S. Holders, including individuals, will be eligible for the preferential tax rates applicable
to long-term capital gains for dividends unless the Company is classified as a PFIC in the taxable year of distribution or in the preceding
taxable year. See &ldquo;&mdash;<I>Passive Foreign Investment Company Rules</I>&mdash;<I>Risk of PFIC Status for the Company</I>&rdquo;
below. The dividend rules are complex, and each U.S. Holder should consult its own tax advisors regarding the application of such rules.</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"><B><I>Sales or Other Taxable Dispositions of Offered Securities</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Upon the sale or other taxable disposition
of Offered Securities , subject to the potential application of the PFIC rules as described below, a U.S. Holder generally will recognize
capital gain or loss in an amount equal to the difference between (i) the U.S. dollar value of cash received plus the fair market value
of any property received and (ii) such U.S. Holder&rsquo;s adjusted tax basis in such Offered Securities sold or otherwise disposed of.
A U.S. Holder&rsquo;s initial tax basis in Shares or Pre-Funded Warrants generally will be determined initially by the holder&rsquo;s
U.S. dollar cost for such securities, while the initial tax basis in Warrant Shares should generally follow the basis of the related Pre-Funded
Warrants as described above under &ldquo;&mdash;<I>Treatment of Pre-Funded Warrants&rdquo;</I> (subject in each case to any adjustments
provided under the PFIC rules, described below). Subject again to the PFIC rules, gain or loss recognized on such sale or other disposition
generally will be long-term capital gain or loss if, at the time of the sale or other disposition, the Offered Securities have been held
for more than one year. Any gain or loss will generally be U.S. source for U.S. foreign tax credit purposes.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Preferential tax rates currently apply to long-term
capital gain of a U.S. Holder that is an individual, estate, or trust. There are currently no preferential tax rates for long-term capital
gain of a U.S. Holder that is a corporation. Deductions for capital losses are subject to significant limitations under the Code. If the
Company is determined to be a PFIC, any gain realized on the Offered Securities could be ordinary income under the rules discussed below.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"><B>Passive Foreign Investment Company Rules</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"><B><I>Risk of PFIC Status for the Company</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">If the Company were to constitute a PFIC under
the meaning of Section 1297 of the Code for any taxable year during the holding period of a U.S. Holder of Offered Securities, then certain
potentially adverse U.S. federal income tax rules may apply to the U.S. Holder. While this summary cannot describe all of the potentially
adverse consequences that would result if the Company were treated as a PFIC for a relevant taxable year, certain material consequences
and related considerations are described below.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The Company believes that it was classified
as a PFIC during the taxable years ended June 30, 2024 and 2023, and, based on the current composition of its income and assets, as well
as current business plans and financial expectations, may meet the PFIC qualification tests for its current taxable year or in future
taxable years. No opinion of legal counsel or ruling from the IRS concerning the PFIC status of the Company or any subsidiary has been
obtained or is currently planned to be requested. The determination of whether any corporation was, or will be, a PFIC for a taxable year
depends, in part, on the application of complex U.S. federal income tax rules, which are subject to differing interpretations. In addition,
whether any corporation will be a PFIC for any taxable year depends on the assets and income of such corporation over the course of each
such taxable year and, as a result, cannot be predicted with certainty as of the date of this document. In addition, even if the Company
concluded that it or any subsidiary did not qualify as a PFIC, the IRS could challenge any determination made by the Company (or any subsidiary
of the Company) concerning its PFIC status in any taxable year, and a court could sustain such challenge. Accordingly, there can be no
assurance that the Company or any subsidiary will not be treated as a PFIC for any taxable year. Each U.S. Holder should consult its own
tax advisors regarding the PFIC status of the Company and each subsidiary of the Company.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In any taxable year in which the Company is
classified as a PFIC, a U.S. Holder will be required to file an annual report with the IRS containing such information as Treasury Regulations
and/or other IRS guidance may require. IRS Form 8621 is currently used for such filings. In addition to penalties, a failure to satisfy
such reporting requirements may result in an extension of the time period during which the IRS can assess a tax. U.S. Holders should consult
their own tax advisors regarding the requirements of filing such information returns under these rules, including the requirement to file
an IRS Form 8621 annually.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The Company generally would be a PFIC for a
particular taxable year if, for such year, (a) 75% or more of the gross income of the Company is passive income (the &ldquo;PFIC income
test&rdquo;) or (b) 50% or more of the value of the Company&rsquo;s assets either produce passive income or are held for the production
of passive income, based on the quarterly average of the fair market value of such assets (the &ldquo;PFIC asset test&rdquo;). &ldquo;Gross
income&rdquo; generally includes all sales revenues less the cost of goods sold, plus income from investments and from incidental or outside
operations or sources, and &ldquo;passive income&rdquo; generally includes, for example, dividends, interest, certain rents and royalties,
certain gains from the sale of stock and securities, and certain gains from commodities transactions. Active business gains arising from
the sale of commodities generally are excluded from passive income if substantially all of a foreign corporation&rsquo;s business is as
an active producer, processor, merchant or handler of commodities, and certain other requirements are satisfied.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">For purposes of the PFIC income test and PFIC
asset test described above, if the Company owns, directly or indirectly, 25% or more of the total value of the outstanding shares of another
corporation, the Company will be treated as if it (a) held a proportionate share of the assets of such other corporation and (b) received
directly a proportionate share of the income of such other corporation. In addition, for purposes of the PFIC income test and PFIC asset
test described above, and assuming certain other requirements are met, &ldquo;passive income&rdquo; does not include certain interest,
dividends, rents, or royalties that are received or accrued by the Company from certain &ldquo;related persons&rdquo; (as defined in Section
954(d)(3) of the Code) also organized in Canada, to the extent such items are properly allocable to the income of such related person
that is neither passive income nor income connected with a U.S. trade or business.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Under certain attribution rules, if the Company
is a PFIC, U.S. Holders will generally be deemed to own their proportionate share of the Company&rsquo;s direct or indirect equity interest
in any company that is also a PFIC (a &ldquo;Subsidiary PFIC&rdquo;), and will generally be subject to U.S. federal income tax on their
proportionate share of (a) any &ldquo;excess distributions,&rdquo; as described below, on the stock of a Subsidiary PFIC and (b) a disposition
or deemed disposition of the stock of a Subsidiary PFIC by the Company or another Subsidiary PFIC, both as if such U.S. Holders directly
held the shares of such Subsidiary PFIC. In addition, U.S. Holders may be subject to U.S. federal income tax on any indirect gain realized
on the stock of a Subsidiary PFIC on the indirect sale or disposition thereof. Accordingly, U.S. Holders should be aware that they could
be subject to tax under the PFIC rules even if no distributions are received from the Company and no redemptions or other dispositions
are made.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"><B><I>Default PFIC Rules</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">If the Company is a PFIC for any taxable year
during which a U.S. Holder owns Offered Securities, the U.S. federal income tax consequences to such U.S. Holder will depend on whether
and when such U.S. Holder makes an election to treat the Company and each Subsidiary PFIC, if any, as a &ldquo;qualified electing fund&rdquo;
(&ldquo;QEF&rdquo;) under Section 1295 of the Code (a &ldquo;QEF Election&rdquo;) or makes a mark-to-market election under Section 1296
of the Code (a &ldquo;Mark-to-Market Election&rdquo;). A U.S. Holder that does not make either a QEF Election or a Mark-to- Market Election
will be referred to in this summary as a &ldquo;Non-Electing U.S. Holder.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A Non-Electing U.S. Holder will be subject
to the rules of Section 1291 of the Code (described below) with respect to (a) any gain recognized on the sale or other taxable disposition
of Offered Securities and (b) any &ldquo;excess distribution&rdquo; received on the Offered Securities. A distribution generally will
be an &ldquo;excess distribution&rdquo; to the extent that such distribution (together with all other distributions received in the current
taxable year) exceeds 125% of the average distributions received during the three preceding taxable years (or during a U.S. Holder&rsquo;s
holding period for the relevant Offered Securities, if shorter).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">If the Company is a PFIC, under Section 1291
of the Code, any gain recognized on the sale or other taxable disposition of Offered Securities (including an indirect disposition of
the stock of any Subsidiary PFIC), and any &ldquo;excess distribution&rdquo; received on Offered Securities or deemed received with respect
to the stock of a Subsidiary PFIC, must be ratably allocated to each day in a Non-Electing U.S. Holder&rsquo;s holding period for the
respective Offered Securities, as applicable. The amount of any such gain or excess distribution allocated to the taxable year of disposition
or distribution of the excess distribution, or allocated to years before the entity became a PFIC, if any, would be taxed as ordinary
income at the rates applicable for such year (and not eligible for certain preferential rates, as discussed below). The amounts allocated
to any other taxable year would be subject to U.S. federal income tax at the highest tax rate applicable to ordinary income in each such
year. In addition, an interest charge would be imposed on the tax liability for each such year, calculated as if such tax liability had
been due in each such year. A Non-Electing U.S. Holder that is not a corporation must treat any such interest paid as &ldquo;personal
interest,&rdquo; which is not deductible.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">If the Company is a PFIC for any taxable year
during which a Non-Electing U.S. Holder holds Offered Securities, the Company will continue to be treated as a PFIC with respect to such
Non-Electing U.S. Holder, regardless of whether the Company ceases to be a PFIC in one or more subsequent taxable years. A Non-Electing
U.S. Holder may terminate this deemed PFIC status by making a &ldquo;purging&rdquo; election to recognize gain (which will be taxed under
the rules of Section 1291 of the Code discussed above), but not loss, as if such Offered Securities were sold on the last day of the last
taxable year for which the Company was a PFIC.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In addition to the rules described above applying
to &ldquo;excess distributions&rdquo; and certain other dispositions of Offered Securities, certain other adverse U.S. federal income
tax rules may apply with respect to a U.S. Holder if the Company is a PFIC, including in some cases even if the U.S. Holder makes a QEF
Election (as described below). All of the non-PFIC rules described herein are subject to the potentially adverse consequences of PFIC
status for the Company and each subsidiary of the Company. Each U.S. Holder should consult its own tax advisors regarding the full tax
consequences of potential PFIC status for the Company and each subsidiary of the Company.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Under proposed Treasury Regulations, if a U.S.
Holder has an option, warrant or other right to acquire stock of a PFIC, such option, warrant or right is generally considered to be PFIC
stock subject to the default rules of Section 1291 of the Code. This rule could adversely affect the availability of the QEF Election
and Mark-to-Market Election with respect to Warrant Shares. (See discussion under &ldquo;<I>&mdash;QEF Election</I>&rdquo; and &ldquo;<I>&mdash;Market-to-Market
Election</I>&rdquo; below.) It is not entirely clear how various aspects of the PFIC rules would apply to the Pre-Funded Warrants and
Warrant Shares, and U.S. Holders should consult their own tax advisors regarding the application of the PFIC rules to Pre-Funded Warrants
and Warrant Shares .</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"><B><I>QEF Election</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">If the Company is a PFIC, a U.S. Holder of
Shares or Warrant Shares that makes a timely and effective QEF Election for the taxable year in which the holding period of its Shares
or Warrant Shares begins generally will not be subject to the rules of Section 1291 of the Code discussed above with respect to such Shares
or Warrant Shares. A U.S. Holder that makes such a QEF Election will be subject to U.S. federal income tax on such U.S. Holder&rsquo;s
pro rata share (based on its ownership of Offered Securities) of (a) the net capital gain of the Company, which will be taxed as long-term
capital gain to such U.S. Holder, and (b) the ordinary earnings of the Company, which will be taxed as ordinary income to such U.S. Holder.
Generally, &ldquo;net capital gain&rdquo; is the excess of (a) net long-term capital gain over (b) net short-term capital loss, and &ldquo;ordinary
earnings&rdquo; are the excess of (a) &ldquo;earnings and profits&rdquo; over (b) net capital gain. A U.S. Holder that makes a QEF Election
will be subject to U.S. federal income tax on such amounts for each taxable year in which the Company is a PFIC, regardless of whether
such amounts are actually distributed to such U.S. Holder by the Company. However, for any taxable year in which the Company is a PFIC
and has no net income or gain, U.S. Holders that have made a QEF Election would not have any income inclusions as a result of the QEF
Election. If a U.S. Holder that made a QEF Election has an income inclusion, such a U.S. Holder may, subject to certain limitations, elect
to defer payment of current U.S. federal income tax on such amounts, subject to an interest charge. If such U.S. Holder is not a corporation,
any such interest paid will be treated as &ldquo;personal interest,&rdquo; which is not deductible.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A U.S. Holder that makes a timely and effective
QEF Election with respect to the Company generally (a) may receive a tax-free distribution from the Company to the extent that such distribution
represents &ldquo;earnings and profits&rdquo; of the Company that were previously included in income by the U.S. Holder because of such
QEF Election and (b) will adjust such U.S. Holder&rsquo;s tax basis in the Shares or Warrant Shares to reflect the amount included in
income or allowed as a tax-free distribution because of such QEF Election. A U.S. Holder that makes a QEF Election generally will recognize
capital gain or loss on the sale or other taxable disposition of Shares or Warrant Shares.</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A U.S. Holder may make a timely QEF Election
by filing the appropriate QEF Election documents (currently IRS Form 8621) at the time such U.S. Holder files a U.S. federal income tax
return for such year. If a U.S. Holder does not make a timely QEF Election for the first year in the U.S. Holder&rsquo;s holding period
in which the Company is a PFIC, the U.S. Holder may still be able to make an effective QEF Election in a subsequent year if such U.S.
Holder meets certain requirements and makes a &ldquo;purging&rdquo; election to recognize gain (which will be taxed under the rules of
Section 1291 of the Code discussed above) as if its Common or Warrant Shares were sold for their fair market value on the day the QEF
Election is effective. If a U.S. Holder makes a QEF Election but does not make a &ldquo;purging&rdquo; election to recognize gain as discussed
in the preceding sentence, then such U.S. Holder shall be subject to the QEF Election rules and shall continue to be subject to tax under
the rules of Section 1291 of the Code discussed above with respect to its Offered Securities. If a U.S. Holder owns PFIC stock indirectly
through another PFIC, separate QEF Elections must be made for the PFIC in which the U.S. Holder is a direct shareholder and the Subsidiary
PFIC for the QEF rules to apply to both PFICs.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A QEF Election will apply to the taxable year
for which such QEF Election is timely made and to all subsequent taxable years, unless such QEF Election is invalidated or terminated
or the IRS consents to revocation of such QEF Election. If a U.S. Holder makes a QEF Election and, in a subsequent taxable year, the Company
ceases to be a PFIC, the QEF Election will remain in effect (although it will not be applicable) during those taxable years in which the
Company is not a PFIC. Accordingly, if the Company becomes a PFIC in another subsequent taxable year, the QEF Election will be effective,
and the U.S. Holder will be subject to the QEF rules described above during any subsequent taxable year in which the Company qualifies
as a PFIC.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">As discussed above, under proposed Treasury
Regulations, if a U.S. Holder has an option, warrant or other right to acquire stock of a PFIC, such option, warrant or right is generally
considered to be PFIC stock subject to the default rules of Section 1291 of the Code on its disposition. However, a holder of an option,
warrant or other right to acquire stock of a PFIC may not make a QEF Election that will apply to the option, warrant or other right to
acquire PFIC stock. If a U.S. Holder of Shares makes a QEF Election, such election could potentially not be treated as a timely QEF Election
with respect to Warrant Shares subsequently acquired on the exercise of Pre-Funded Warrants, and the rules of Section 1291 of the Code
discussed above may continue to apply with respect to all of such U.S. Holder&rsquo;s previously owned Offered Securities. U.S. Holders
should consult their own tax advisors regarding the application of the PFIC rules to Pre-Funded Warrants and Warrant Shares and the availability
of a QEF Election with respect thereto.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The Company will endeavor to provide U.S. Holders
with the required information to allow U.S. Holders to make a QEF Election with respect to the Shares and Warrant Shares in the event
that the Company determines it is treated as a PFIC for any taxable year. There can be no assurance, however, that the Company will timely
provide such information for any particular year, or that the Company&rsquo;s determination regarding its PFIC status will be upheld.
U.S. Holders should consult their tax advisors to determine whether any of these QEF Elections will be available and if so, what the consequences
of these elections would be in their particular circumstances.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A U.S. Holder makes a QEF Election by attaching
a completed IRS Form 8621, including a PFIC Annual Information Statement, to a timely filed United States federal income tax return. However,
if the Company does not timely provide the required information with regard to the Company or any of its Subsidiary PFICs, U.S. Holders
may not be able to make a QEF Election for such entity and, unless they make the Mark-to- Market Election discussed in the next section,
will continue to be subject to the rules of Section 1291 of the Code discussed above that apply to Non-Electing U.S. Holders with respect
to the taxation of gains and excess distributions.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Mark-to-Market Election</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A U.S. Holder may make a Mark-to-Market Election
only with respect to Offered Securities that are marketable stock. A Mark-to-Market Election generally will not be available with respect
to the Pre-Funded Warrants. The Shares and Warrant Shares generally will be &ldquo;marketable stock&rdquo; if they are regularly traded
on (a) a national securities exchange that is registered with the SEC, (b) the national market system established pursuant to Section
11A of the Exchange Act, or (c) a foreign securities exchange that is regulated or supervised by a governmental authority of the country
in which the market is located, provided that the foreign exchange meets certain trading volume and other requirements. If such stock
is traded on such a qualified exchange or other market, such stock generally will be &ldquo;regularly traded&rdquo; for any calendar year
during which such stock is traded, other than in de minimis quantities, on at least 15 days during each calendar quarter. The Company
expects that the Shares and Warrant Shares will meet the definition of &ldquo;marketable stock,&rdquo; although there can be no assurance
of this, especially as regards the required trading frequency.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">If a U.S. Holder makes a Mark-to-Market Election
for any taxable year with respect to its Shares or Warrant Shares, it generally will not be subject to the rules of Section 1291 of the
Code discussed above with respect to such Shares or Warrant Shares for such taxable year. However, if a U.S. Holder does not make a Mark-to-Market
Election beginning in the first taxable year of such U.S. Holder&rsquo;s holding period for which the Company is a PFIC and such U.S.
Holder has not made a timely QEF Election, the rules of Section 1291 of the Code discussed above will apply to certain dispositions of,
and certain distributions on, the Shares and Warrant Shares.</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Any Mark-to-Market Election made by a U.S.
Holder for Shares will also apply to such U.S. Holder&rsquo;s Warrant Shares. As a result, if a Market-to-Market Election has been made
by a U.S. Holder with respect to Shares, any Warrant Shares received on exercise of Pre-Funded Warrants will automatically be marked-to-market
in the year of exercise. If the Company is a PFIC at the time a U.S. Holder acquires Pre-Funded Warrants, a U.S. Holder&rsquo;s holding
period for Warrant Shares received on exercise of such Pre-Funded Warrants should include the period during which such U.S. Holder has
held the Pre-Funded Warrants. In these circumstances, a U.S. Holder will be treated as making a Mark-to-Market Election with respect to
its Warrant Shares after the beginning of such U.S. Holder&rsquo;s holding period for such Shares, unless the Shares are acquired in the
same taxable year as the year in which the U.S. Holder acquired the corresponding Pre-Funded Warrants, and the tax regime and interest
charge of Section 1291 described above generally will apply to the mark-to-market gain realized in the taxable year in which the Shares
are received. However, the general mark-to-market rules will apply to subsequent taxable years. A U.S. Holder of Shares or Warrant Shares
that makes a Mark-to-Market Election will include in ordinary income, for each taxable year in which the Company is a PFIC, an amount
equal to the excess, if any, of (a) the fair market value of the Shares or Warrant Shares, as of the close of such taxable year over (b)
such U.S. Holder&rsquo;s adjusted tax basis in such Shares or Warrant Shares. A U.S. Holder of Shares or Warrant Shares that makes a Mark-to-Market
Election will be allowed a deduction in an amount equal to the excess, if any, of (a) such U.S. Holder&rsquo;s adjusted tax basis in the
Shares or Warrant Shares, over (b) the fair market value of such Shares or Warrant Shares (but only to the extent of the net amount of
previously included income as a result of the Mark-to-Market Election for prior taxable years).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A U.S. Holder of Shares or Warrant Shares that
makes a Mark-to-Market Election will also generally adjust its tax basis in the Shares or Warrant Shares to reflect the amount included
in gross income or allowed as a deduction because of such Mark-to-Market Election. Upon a sale or other taxable disposition of Shares
or Warrant Shares, a U.S. Holder that makes a Mark-to-Market Election will recognize ordinary income or ordinary loss (and such ordinary
loss may be treated as capital or subject to limitations in certain cases).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A U.S. Holder of Shares or Warrant Shares makes
a Mark-to-Market Election by attaching a completed IRS Form 8621 to a timely filed United States federal income tax return. A Mark-to-Market
Election applies to the taxable year in which such Mark-to-Market Election is made and to each subsequent taxable year, unless the Shares
or Warrant Shares cease to be &ldquo;marketable stock&rdquo; or the IRS consents to revocation of such election. Each U.S. Holder should
consult its own tax advisors regarding the requirements for, and procedure for making, a Mark-to-Market Election.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Although a U.S. Holder may be eligible to make
a Mark-to-Market Election with respect to the Shares or Warrant Shares, no such election may be made with respect to the stock of any
Subsidiary PFIC that a U.S. Holder is treated as owning, because such stock is not marketable. Hence, the Mark-to-Market Election will
not be effective to avoid the application of the default rules of Section 1291 of the Code described above with respect to deemed dispositions
of Subsidiary PFIC stock or excess distributions from a Subsidiary PFIC to its shareholder.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"><B>AS THE PFIC RULES ARE COMPLEX AND UNCERTAIN, U.S. HOLDERS SHOULD
CONSULT WITH THEIR TAX ADVISORS TO DETERMINE THE POTENTIAL APPLICATION OF THE PFIC RULES TO THEM AND THEIR OFFERED SECURITIES AND ANY
RESULTANT TAX CONSEQUENCES, INCLUDING THE AVAILABILITY OR LACK THEREOF OF A QEF ELECTION OR MARK-TO-MARKET ELECTION, ESPECIALLY WITH RESPECT
TO WARRANT SHARES AND PRE-FUNDED WARRANTS.</B></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Additional Considerations</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Receipt of Foreign Currency</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The amount of any distribution paid to a U.S.
Holder in foreign currency, or on the sale, exchange or other taxable disposition of Offered Securities, generally will be equal to the
U.S. dollar value of such foreign currency based on the exchange rate applicable on the date of receipt (regardless of whether such foreign
currency is converted into U.S. dollars at that time). A U.S. Holder will have a basis in the foreign currency equal to its U.S. dollar
value on the date of receipt. Any U.S. Holder who converts or otherwise disposes of the foreign currency after the date of receipt may
have a foreign currency exchange gain or loss that would be treated as ordinary income or loss, and generally will be U.S. source income
or loss for foreign tax credit purposes. Different rules apply to U.S. Holders who use the accrual method of tax accounting. Each U.S.
Holder should consult its own U.S. tax advisors regarding the U.S. federal income tax consequences of receiving, owning, and disposing
of foreign currency.</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">&nbsp;</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Foreign Tax Credit</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Subject to the potential application of the
PFIC rules discussed above, a U.S. Holder that pays (whether directly or through withholding) Canadian income tax with respect to dividends
paid on the Shares or Warrant Shares generally will be entitled, at the election of such U.S. Holder, to receive either a deduction or
a credit for such Canadian income tax. Generally, a credit will reduce a U.S. Holder&rsquo;s U.S. federal income tax liability on a dollar-for-dollar
basis, whereas a deduction will reduce a U.S. Holder&rsquo;s income that is subject to U.S. federal income tax. This election is made
on a year-by-year basis and applies to all foreign taxes paid (whether directly or through withholding) by a U.S. Holder during a year.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Complex limitations apply to the foreign tax
credit, including the general limitation that the credit cannot exceed the proportionate share of a U.S. Holder&rsquo;s U.S. federal income
tax liability that such U.S. Holder&rsquo;s &ldquo;foreign source&rdquo; taxable income bears to such U.S. Holder&rsquo;s worldwide taxable
income. In applying this limitation, a U.S. Holder&rsquo;s various items of income and deduction must be classified, under complex rules,
as either &ldquo;foreign source&rdquo; or &ldquo;U.S. source.&rdquo; Generally, dividends paid on the Shares or Warrant Shares should
be treated as foreign source for this purpose, and gains recognized on the sale of Offered Securities by a U.S. Holder should be treated
as U.S. source for this purpose, except as otherwise provided in an applicable income tax treaty, and if an election is properly made
under the Code. However, the amount of a distribution with respect to the Shares or Warrant Shares that is treated as a &ldquo;dividend&rdquo;
may be lower for U.S. federal income tax purposes than it is for Canadian federal income tax purposes, resulting in a reduced foreign
tax credit allowance to a U.S. Holder. In addition, this limitation is calculated separately with respect to specific categories of income.
The foreign tax credit rules are complex, and each U.S. Holder should consult its own U.S. tax advisors regarding their application and
calculation.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Information Reporting and Backup Withholding</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Certain U.S. Holders may be subject to certain
reporting obligations with respect to Offered Securities if the aggregate value of these and certain other &ldquo;specified foreign financial
assets&rdquo; exceeds an applicable dollar threshold. If required, this disclosure is made by filing Form 8938 with the IRS. Significant
penalties can apply if a U.S. Holder is required to make this disclosure and fails to do so. In addition, a U.S. Holder should consider
the possible obligation to file online a FinCEN Form 114&mdash;Foreign Bank and Financial Accounts Report, as a result of holding Offered
Securities in certain accounts. Holders are urged to consult their U.S. tax advisors with respect to these and other reporting requirements
that may apply to their acquisition of Offered Securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Dividend payments (including constructive dividends)
with respect to Shares or Warrant Shares and proceeds from the sale, exchange or redemption of Offered Securities may be subject to information
reporting to the IRS and possible United States backup withholding. Backup withholding (currently at a rate of 24%) will not apply, however,
to a U.S. Holder who furnishes a correct taxpayer identification number (generally on an IRS Form W-9 provided to the paying agent of
the U.S. Holder&rsquo;s broker) and makes other required certifications, or who is otherwise exempt from backup withholding and establishes
such exempt status. Backup withholding is not an additional tax. Any amounts withheld under the U.S. backup withholding tax rules may
be allowed as a credit against a U.S. Holder&rsquo;s U.S. federal income tax liability, if any, provided the required information is timely
furnished to the IRS.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"><B>THE ABOVE SUMMARY IS NOT INTENDED TO CONSTITUTE A COMPLETE ANALYSIS
OF ALL TAX CONSIDERATIONS RELEVANT OR APPLICABLE TO U.S. HOLDERS. U.S. HOLDERS SHOULD CONSULT THEIR OWN TAX ADVISORS AS TO THE TAX CONSIDERATIONS
APPLICABLE TO THEM IN THEIR OWN PARTICULAR CIRCUMSTANCES.</B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"></P>




<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt"></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Toc195656910"></A><A NAME="a_Toc194695862"></A>Certain
Canadian Federal Income Tax Considerations For U.S. Residents</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The following generally summarizes certain
Canadian federal income tax consequences generally applicable under the <I>Income Tax Act </I>(Canada) and the regulations enacted thereunder
(collectively, the &ldquo;Canadian Tax Act&rdquo;) and the Canada-United States Tax Convention (1980) (the &ldquo;Convention&rdquo;) to
the holding and disposition of Common Shares or Pre-Funded Warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Comment is restricted to holders of Common
Shares or Pre-Funded Warrants each of whom, at all material times for the purposes of the Canadian Tax Act and the Convention, (i) is
resident solely in the United States for tax purposes, (ii) acquires, as beneficial owner, pursuant to this prospectus supplement, the
Common Shares and Pre-Funded Warrants, (iii) is a &ldquo;qualifying person&rdquo; under and entitled to the benefits of the Convention,
(iv) holds all Common Shares and Pre-Funded Warrants as capital property, (v) deals at arm&rsquo;s length with and is not affiliated with
NioCorp or the underwriter, (vi) does not and is not deemed to use or hold any Common Shares or Pre-Funded Warrants in a business carried
on in Canada, (vii) is not an insurer that carries on business in Canada and elsewhere, (viii) is not an &ldquo;authorized foreign bank&rdquo;
(as defined in the Canadian Tax Act), and (ix) has not entered into a &ldquo;derivative forward agreement&rdquo; (as defined in the Canadian
Tax Act) with respect to the Common Shares or Pre-Funded Warrants (each such holder, a &ldquo;U.S. Resident Holder&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Certain U.S.-resident entities that are fiscally
transparent for United States federal income tax purposes (including limited liability companies) may not in all circumstances be entitled
to the benefits of the Convention. Members of or holders of an interest in such an entity that holds Common Shares or Pre-Funded Warrants
should consult their own tax advisers regarding the extent, if any, to which the benefits of the Convention will apply to the entity in
respect of its Common Shares or Pre-Funded Warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Generally, a U.S. Resident Holder&rsquo;s Common
Shares or Pre-Funded Warrants will be considered to be capital property of such holder provided that the U.S. Resident Holder is not a
trader or dealer in securities, did not acquire, hold, or dispose of the Common Shares or Pre-Funded Warrants in one or more transactions
considered to be an adventure or concern in the nature of trade (i.e., speculation) and does not hold the Common Shares or Pre-Funded
Warrants in the course of carrying on a business.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">This summary is based on the facts set out
in this prospectus supplement, the current provisions of the Canadian Tax Act and the Convention in effect as of the date prior to the
date hereof, all specific proposals to amend the Canadian Tax Act and Convention publicly announced by or on behalf of the Minister of
Finance (Canada) prior to the date hereof, and the current published administrative policies and assessing practices of the Canada Revenue
Agency (the &ldquo;CRA&rdquo;). It is assumed that all such amendments will be enacted as currently proposed, and that there will be no
other material change to any applicable law or administrative policy or assessing practice, whether by way of judicial, legislative or
governmental decision or action, although no assurance can be given in these respects. This summary is not exhaustive of all possible
Canadian federal income tax considerations. Except as otherwise</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">expressly provided, this summary does not take into account any
provincial, territorial, or foreign tax considerations, which may differ materially from those set out herein.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in"><B><I>This summary is of a general nature only,
is not exhaustive of all possible Canadian federal income tax considerations, and is not intended to be and should not be construed as
legal or tax advice to any particular U.S. Resident Holder. The tax consequences of acquiring, holding and disposing of Common Shares
or Pre-Funded Warrants will vary according to the U.S. Resident Holder&rsquo;s particular circumstances. U.S. Resident Holders are urged
to consult their own tax advisers for advice with respect to their particular circumstances. The discussion below is qualified accordingly.</I></B></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Currency Conversion</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In general, for purposes of the Canadian Tax
Act, all amounts relating to the acquisition, holding or disposition of Common Shares and Pre-Funded Warrants must be converted into
Canadian dollars based on the relevant exchange rate as determined in accordance with the Canadian Tax Act.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Exercise of Pre-Funded Warrants</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">No gain or loss will be realized by a U.S.
Resident Holder upon the exercise or deemed exercise of a Pre-Funded Warrant to acquire a Common Share. When a Pre-Funded Warrant is exercised
or deemed to be exercised, the cost of the Common Share acquired by the U.S. Resident Holder on exercise of the Pre-Funded Warrant will
be the aggregate of the U.S. Holder&rsquo;s adjusted cost base of such Pre-Funded Warrant and the exercise price paid to acquire the Common
Share. The adjusted cost base of the Common Share acquired by the U.S. Resident Holder on exercise of the Pre-Funded Warrant will be determined
by averaging the cost of such Common Share with the adjusted cost base to the U.S. Resident Holder of all Common Shares held by the U.S.
Resident Holder as capital property (if any) immediately prior to such acquisition.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Disposition of Common Shares and Pre-Funded Warrants</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A U.S. Resident Holder will not be subject
to tax under the Canadian Tax Act in respect of any capital gain realized on a disposition or deemed disposition of a Common Share or
Pre-Funded Warrant unless the Common Share or Pre-Funded Warrant is &ldquo;taxable Canadian property&rdquo; of the U.S. Resident Holder
for the purposes of the Canadian Tax Act at the time of disposition and the U.S. Resident Holder is not entitled to an exemption under
the Convention. In addition, capital losses arising on a disposition or deemed disposition of a Pre-Funded Warrant or a Common Share will not be recognized under the Canadian Tax Act, unless the Pre-Funded Warrant or Common
Share constitutes &ldquo;taxable Canadian property&rdquo; (as defined in the Canadian Tax Act) at the time of disposition and the U.S.
Resident Holder is not entitled to relief under the Convention.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Generally, a U.S. Resident Holder&rsquo;s Common
Shares or Pre-Funded Warrants will not constitute &ldquo;taxable Canadian property&rdquo; of such holder at a particular time at which
the Common Shares are listed on a &ldquo;designated stock exchange&rdquo; (which currently includes the Nasdaq) unless, at any time during
the 60-month period that ends at the particular time both of the following conditions are concurrently met:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">(i)</TD><TD>25% or more of the issued shares of any class of the capital stock of NioCorp were owned by or belonged to one or any combination
of</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">(A)</TD><TD>the U.S. Resident Holder,</TD></TR></TABLE>


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    <!-- Field: /Page -->

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">(B)</TD><TD>persons with whom the U.S. Resident Holder did not deal at arm&rsquo;s length, and</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">(C)</TD><TD>partnerships in which the U.S. Resident Holder or a person referred to in clause (B) holds a membership interest directly or indirectly
through one or more partnerships, and</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">(ii)</TD><TD>more than 50% of the fair market value of the Common Shares was derived directly or indirectly from, one or any combination of, real
or immovable property situated in Canada, &ldquo;Canadian resource properties&rdquo; (as defined in the Canadian Tax Act), &ldquo;timber
resource properties&rdquo; (as defined in the Canadian Tax Act), or options in respect of, or interests in any of the foregoing, whether
or not the property exists.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Notwithstanding the foregoing, Common Shares
or Pre-Funded Warrants may also be deemed to be &ldquo;taxable Canadian property&rdquo; in certain circumstances set out in the Canadian
Tax Act.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Dividends on Common Shares</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A U.S. Resident Holder to whom NioCorp pays
or credits or is deemed to pay or credit a dividend on such holder&rsquo;s Common Shares will be subject to Canadian withholding tax,
and NioCorp will be required to withhold the tax from the dividend and remit it to the CRA for the holder&rsquo;s account. The rate of
withholding tax under the Canadian Tax Act is 25% of the gross amount of the dividend, but should generally be reduced under the Convention
to 15% (or, if the U.S. Resident Holder is a company which is the beneficial owner of at least 10% of the voting stock of NioCorp, 5%)
of the gross amount of the dividend. For this purpose, a company that is a resident of the United States for purposes of the Canadian
Tax Act and the Convention and is entitled to the benefits of the Convention shall be considered to own the voting stock of NioCorp owned
by an entity that is considered fiscally transparent under the laws of the United States and that is not a resident of Canada, in proportion
to such company&rsquo;s ownership interest in that entity.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Toc194695863"></A><A NAME="a_Toc195656911"></A>Underwriting</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Maxim Group LLC (&ldquo;Maxim&rdquo; or the
&ldquo;underwriter&rdquo;) is acting as the underwriter of this offering. We have entered into an underwriting agreement dated April 17,
2025 with the underwriter (the &ldquo;underwriting agreement&rdquo;). Subject to the terms and conditions of the underwriting agreement,
we have agreed to sell to the underwriter, and the underwriter has agreed to purchase, at the public offering price less the underwriting
discounts and commissions set forth on the cover page of this prospectus supplement, the following numbers of our Common Shares and Pre-Funded
Warrants:</P>

<TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" STYLE="width: 80%; font: 8pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="padding: 0.5pt 5pt 0.5pt 0pt; width: 34%"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; border-bottom: Black 0.5pt solid"><FONT STYLE="font-size: 10pt"><B>Underwriter</B></FONT></P></TD>
    <TD STYLE="padding: 0.5pt 5pt; width: 33%"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; border-bottom: Black 0.5pt solid"><FONT STYLE="font-size: 10pt"><B>Number
                           of Common Shares</B></FONT></P></TD>
    <TD STYLE="padding: 0.5pt 0pt 0.5pt 5pt; width: 33%"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; border-bottom: Black 0.5pt solid"><FONT STYLE="font-size: 10pt"><B>Number
                           of Pre-Funded Warrants</B></FONT></P></TD></TR>
  <TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="padding: 0.5pt 5pt 0.5pt 0pt"><FONT STYLE="font-size: 10pt">Maxim Group LLC</FONT></TD>
    <TD STYLE="padding: 0.5pt 5pt; text-align: right"><FONT STYLE="font-size: 10pt">6,628,846</FONT></TD>
    <TD STYLE="padding: 0.5pt 0pt 0.5pt 5pt; text-align: right"><FONT STYLE="font-size: 10pt">1,063,462</FONT></TD></TR>
  <TR STYLE="vertical-align: top; background-color: White">
    <TD STYLE="padding: 0.5pt 5pt 0.5pt 0pt">&nbsp;</TD>
    <TD STYLE="padding: 0.5pt 5pt; text-align: right">&nbsp;</TD>
    <TD STYLE="padding: 0.5pt 0pt 0.5pt 5pt; text-align: right">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="padding: 0.5pt 5pt 0.5pt 0pt"><FONT STYLE="font-size: 10pt"><B>TOTAL</B></FONT></TD>
    <TD STYLE="padding: 0.5pt 5pt; text-align: right"><FONT STYLE="font-size: 10pt">6,628,846</FONT></TD>
    <TD STYLE="padding: 0.5pt 0pt 0.5pt 5pt; text-align: right"><FONT STYLE="font-size: 10pt">1,063,462</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The underwriter is committed to purchase all
the Common Shares and Pre-Funded Warrants offered hereby, other than those covered by the over-allotment option to purchase Option Shares
described below, if it purchases any Common Shares or Pre-Funded Warrants. The obligations of the underwriter may be terminated upon the
occurrence of certain events specified in the underwriting agreement. Furthermore, pursuant to the underwriting agreement, the underwriter&rsquo;s
obligations are subject to customary conditions, representations and warranties contained in the underwriting agreement, such as receipt
by the underwriter of officer&rsquo;s certificates and legal opinions.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Delivery of the Common Shares and Pre-Funded
Warrants (other than any Option Shares) offered hereby is expected on or about April 21,
2025, against payment in immediately available funds and subject to customary closing conditions.</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We have agreed to indemnify the underwriter
against certain liabilities, including liabilities under the Securities Act and liabilities arising from breaches of representations and
warranties contained in the underwriting agreement, or to contribute to payments that the underwriter may be required to make in respect
of those liabilities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The underwriter is offering the Common Shares
and Pre-Funded Warrants subject to various conditions and may reject all or part of any order. The underwriter has advised us that it
proposes to offer the Common Shares and Pre-Funded Warrants directly to the public at the public offering price that appears on the cover
page of this prospectus supplement.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Over-Allotment Option</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We have granted the underwriter an over-allotment
option. The over-allotment option, which is exercisable for up to 30 days following the execution date of the underwriting agreement,
permits the underwriter to purchase up to an aggregate of 1,153,846 Option Shares (equal
to 15% of the aggregate number of initial Common Shares and Pre-Funded Warrants offered hereby). If the underwriter exercises all or part of the over-allotment
option, it will purchase Option Shares covered by the over-allotment option at the public offering price that appears on the cover page
of this prospectus supplement, less the applicable underwriting discounts and commissions. If the underwriter exercises the over-allotment
option to purchase Option Shares in full, without giving effect to the exercise of any Pre-Funded Warrants, the total proceeds to us from
this offering, before expenses payable by us, will be approximately $21,389,894.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Underwriting Discounts and Commissions</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The following table provides information regarding
the amount of the underwriting discounts and commissions to be paid to the underwriter by us and the proceeds, before expenses, to us
in connection with this offering, assuming both no exercise and full exercise of the over-allotment option to purchase Option Shares:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-weight: bold; border-bottom: Black 1pt solid">&thinsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="3" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Per Common <BR> Share</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="3" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Per Pre-Funded<BR> Warrant</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="3" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Total without Exercise<BR> of Over-allotment<BR> Option</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="3" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Total with Full<BR> Exercise of Over-<BR> allotment Option<BR> to <BR> Purchase Option<BR> Shares</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 40%; padding-left: 5pt">Public offering price</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">2.600</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%; font-size: 8pt">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">2.5999</TD><TD STYLE="width: 1%; font-size: 8pt; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">19,999,894.45</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 12%; text-align: right">22,999,894.05</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-left: 5pt"><FONT STYLE="font-size: 10pt">Underwriting discounts and
    commissions<SUP>(1)</SUP></FONT></TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">0.182</TD><TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="font-size: 8pt">&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">0.1820</TD><TD STYLE="font-size: 8pt; text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1,400,000.06</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1,610,000.03</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-left: 5pt"><FONT STYLE="font-size: 10pt">Proceeds, before expenses, to us<SUP>(2)</SUP></FONT></TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">2.418</TD><TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="font-size: 8pt">&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">2.4179</TD><TD STYLE="font-size: 8pt; text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">18,599,894.40</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">21,389,894.03</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
  </TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 6pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in">(1)</TD><TD>Includes an underwriting discount of 7.00% on the public offering price of the Common Shares and the Pre-Funded Warrants.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 6pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in">(2)</TD><TD>Does not give effect to the exercise of any Pre-Funded Warrants offered hereby.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We estimate that our total expenses of this
offering, excluding the estimated underwriting discounts and commissions, will be approximately $505,000,
which includes up to $100,000 that we have agreed to reimburse the underwriter for the fees and expenses incurred by it and its legal
counsel in connection with this offering.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Lock-Up Agreements</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Our executive officers and directors, have
agreed to a 90-day &ldquo;lock-up&rdquo; with respect to the Common Shares and other of our securities such parties beneficially own,
including securities that are convertible into Common Shares and securities that are exchangeable or exercisable for Common Shares, subject
to certain exceptions. This means that, subject to certain exceptions, for a period of 90 days following the date of the underwriting
agreement, such persons may not offer, sell, contract to sell, hypothecate, pledge or otherwise dispose of (or enter into any transaction
which is designed to, or might reasonably be expected to, result in the disposition (whether by actual disposition or effective economic
disposition due to cash settlement or otherwise) by such persons or any of their affiliates), directly or indirectly, or establish or
increase a put equivalent position or liquidate or decrease a call equivalent position within the meaning of Section 16 of the Exchange
Act, with respect to, any such securities without the prior written consent of Maxim.</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In addition, subject to certain exceptions,
we have agreed, (i) for a period of 90 days following the date of the closing of the offering, not to, and to cause our subsidiaries
not to, issue, enter into any agreement to issue or announce the issuance or proposed issuance of any Common Shares or any securities
that are convertible into, or exchangeable or exercisable for, Common Shares and (ii) for a period of 90 days following the date of the
closing of the offering, issue any securities that are subject to a price reset based on the trading prices of our Common Shares or upon
a specified or contingent event in the future, or enter into any agreement to issue securities at a future determined price. The foregoing
restrictions may be waived by Maxim at its discretion, although Maxim has no present intention to waive or shorten any of such restrictive
periods.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Other Compensation</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">We have agreed that, until November 14, 2025,
we will grant Maxim a right of first refusal to act as sole managing underwriter and sole book runner, sole placement agent or sole sales
agent for any and all future public or private equity, equity-linked, convertible or debt offerings of ours or any successor to or any
subsidiary of ours during such period, subject to certain exceptions.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In the event that any investor whom Maxim had
contacted or introduced to us during the term of its engagement provides any capital to us, in a public or private offering or other financing
or capital-raising transaction of any kind, before December 31, 2025, subject to certain conditions and exceptions, we will pay Maxim
the cash compensation provided above, calculated in the same manner.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Electronic Offer, Sale and Distribution of Shares</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A prospectus supplement in electronic format
may be made available on the website maintained by the underwriter or selling group members. The underwriter may agree to allocate a number
of securities to the selling group members for sale to its online brokerage account holders. Internet distributions will be allocated
by the underwriter and selling group members that will make internet distributions on the same basis as other allocations. Other than
the prospectus supplement in electronic format, the information on these websites is not part of, nor incorporated by reference into,
this prospectus supplement or the registration statement of which this prospectus supplement forms a part, has not been approved or endorsed
by us, and should not be relied upon by investors.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Stabilization</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The underwriter has advised us that it, pursuant
to Regulation M under the Exchange Act, and certain persons participating in the offering may engage in short sale transactions, stabilizing
transactions, syndicate covering transactions or the imposition of penalty bids in connection with this offering. These activities may
have the effect of stabilizing or maintaining the market price of the Common Shares at a level above that which might otherwise prevail
in the open market. Establishing short sales positions may involve either &ldquo;covered&rdquo; short sales or &ldquo;naked&rdquo; short
sales.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">A stabilizing bid is a bid for the purchase
of the Common Shares on behalf of the underwriter for the purpose of fixing or maintaining the price of the Common Shares. A syndicate
covering transaction is the bid for or the purchase of Common Shares on behalf of the underwriter to reduce a short position incurred
by the underwriter in connection with the offering. Similar to other purchase transactions, the underwriter&rsquo;s purchases to cover
the syndicate short sales may have the effect of raising or maintaining the market price of the Common Shares or preventing or retarding
a decline in the market price of the Common Shares. As a result, the price of the Common Shares may be higher than the price that might
otherwise exist in the open market. A penalty bid is an arrangement permitting the underwriter to reclaim the selling concession otherwise
accruing to a syndicate member in connection with the offering if the Common Shares originally sold by such syndicate member are purchased
in a syndicate covering transaction and therefore have not been effectively placed by such syndicate member.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Neither the Company nor the underwriter make
any representation or prediction as to the direction or magnitude of any effect that the transactions described above may have on the
price of the Common Shares. The underwriter is not obligated to engage in these activities and, if commenced, any of the activities may
be discontinued at any time.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Passive Market Making</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The underwriter may also engage in passive
market making transactions in the Common Shares on Nasdaq in accordance with Rule 103 of Regulation M during a period before the commencement
of offers or sales of the Common Shares in this offering and extending through the completion of distribution. A passive market maker
must display its bid at a price not in excess of the highest</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">independent bid of that security. However, if all independent bids
are lowered below the passive market maker&rsquo;s bid, that bid must then be lowered when specified purchase limits are exceeded.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Other Relationships</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The underwriter and its affiliates may provide
from time to time in the future, certain commercial banking, financial advisory, investment banking and other services to the Company
and its affiliates in the ordinary course of their business, for which they may receive customary fees and commissions. From time to time,
the underwriter and its affiliates may effect transactions for their own account or the account of customers, and hold on behalf of themselves
or their customers, long or short positions in the Company&rsquo;s debt or equity securities or loans.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Listing</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The Common Shares are listed for trading on
the Nasdaq Global Market under the symbol &ldquo;NB.&rdquo;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">Selling Restrictions</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">This prospectus supplement and accompanying
prospectus do not constitute an offer to sell to, or a solicitation of an offer to buy from, anyone in any country or jurisdiction (i)
in which such an offer or solicitation is not authorized, (ii) in which any person making such offer or solicitation is not qualified
to do so or (iii) in which any such offer or solicitation would otherwise be unlawful. No action has been taken that would, or is intended
to, permit a public offer of the securities or possession or distribution of this prospectus supplement and accompanying prospectus or
any other offering or publicity material relating to the securities in any country or jurisdiction (other than the United States) where
any such action for that purpose is required. Accordingly, the underwriter has undertaken that it will not, directly or indirectly, offer
or sell any securities or have in its possession, distribute or publish any prospectus, form of application, advertisement or other document
or information in any country or jurisdiction except under circumstances that will, to the best of its knowledge and belief, result in
compliance with any applicable laws and regulations and all offers and sales of securities by it will be made on the same terms.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt 0.25in">European Economic Area</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In relation to each Member State of the European
Economic Area (each, a &ldquo;Member State&rdquo;) an offer to the public of any securities may not be made in that Member State prior
to the publication of a prospectus in relation to the securities which has been approved by the competent authority in that Member State
or, where appropriate, approved in another Member State and notified to the competent authority in that Member State, all in accordance
with the Prospectus Regulation, except that an offer to the public in that Member State of any securities may be made at any time under
the following exemptions under the Prospectus Regulation:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>to any legal entity which is a qualified investor as defined under Article 2 of the Prospectus Regulation;</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>to fewer than 150 natural or legal persons (other than qualified investors as defined under Article 2 of the Prospectus Regulation),
subject to obtaining the prior consent of the underwriter for any such offer; or</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>in any other circumstances falling within Article 1(4) of the Prospectus Regulation,</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">provided that no such offer of securities shall
require the issuer or any underwriter to publish a prospectus pursuant to Article 3 of the Prospectus Regulation or supplement a prospectus
pursuant to Article 23 of the Prospectus Regulation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">For the purposes of this provision, the expression
an &ldquo;offer to the public&rdquo; in relation to any securities in any Member State means the communication in any form and by any
means of sufficient information on the terms of the offer and any securities to be offered so as to enable an investor to decide to purchase,
or subscribe for, any securities and the expression &ldquo;Prospectus Regulation&rdquo; means Regulation (EU) 2017/1129 (and amendments
thereto).</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt 0.25in">United Kingdom</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In relation to the United Kingdom, no securities
have been offered or will be offered pursuant to the offer described herein to the public in the United Kingdom prior to the publication
of a prospectus in relation to the securities which has been approved by the UK Financial Conduct Authority, except that the securities
may be offered to the public in the United Kingdom at any time:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">(i) to any legal entity which is a qualified
investor as defined under Article 2 of the UK Prospectus Regulation;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">(ii) to fewer than 150 natural or legal persons
(other than qualified investors as defined under Article 2 of the UK Prospectus Regulation), subject to obtaining the prior consent of
the underwriter for any such offer; or</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">(iii) in any other circumstances falling within
Section 86 of the Financial Services and Markets Act 2000 (as amended) (the &ldquo;FSMA&rdquo;),</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in"><I>provided</I> that no such offer of the securities
shall require the issuer or any underwriter to publish a prospectus pursuant to Section 85 of the FSMA or supplement a prospectus pursuant
to Article 23 of the UK Prospectus Regulation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Each person in the United Kingdom who acquires
any securities in the offer or to whom any offer is made will be deemed to have represented, acknowledged and agreed to and with the issuer
and the underwriter that it is a qualified investor within the meaning of the UK Prospectus Regulation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In the case of any securities being offered
to a financial intermediary as that term is used in Article 5(1) of the UK Prospectus Regulation, each such financial intermediary will
be deemed to have represented, acknowledged and agreed to and with the issuer and the underwriter that the securities acquired by it in
the offer have not been acquired on a non-discretionary basis on behalf of, nor have they been acquired with a view to their offer or
resale to, persons in circumstances which may give rise to an offer to the public other than their offer or resale in the United Kingdom
to qualified investors, in circumstances in which the prior consent of the underwriter has been obtained to each such proposed offer or
resale. Neither the issuer nor the underwriter has authorised, nor do they authorise, the making of any offer of securities through any
financial intermediary, other than offers made by the underwriter which constitute the final placement of securities contemplated in this
document.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The issuer and the underwriter and its affiliates
will rely upon the truth and accuracy of the foregoing representations, acknowledgements and agreements.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">For the purposes of this provision, the expression
an &ldquo;offer to the public&rdquo; in relation to the securities in the United Kingdom means the communication in any form and by any
means of sufficient information on the terms of the offer and any securities to be offered so as to enable an investor to decide to purchase
or subscribe for any securities and the expression &ldquo;UK Prospectus Regulation&rdquo; means Regulation (EU) 2017/1129 as it forms
part of United Kingdom law by virtue of the European Union (Withdrawal) Act 2018.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">In the United Kingdom, this document is being
distributed only to, and is directed only at, persons who are &ldquo;qualified investors&rdquo; within the meaning of Article 2(e) of
the UK Prospectus Regulation who are also: (i) persons who fall within the definition of &ldquo;investment professionals&rdquo; in Article
19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005, as amended (the &ldquo;Order&rdquo;); (ii) persons
falling within Article 49(2) of the Order; or (iii) persons to whom it may otherwise lawfully be communicated (all such persons together
being referred to as &ldquo;relevant persons&rdquo;). This document must not be acted on or relied on in the United Kingdom by persons
who are not relevant persons. Any investment or investment activity to which this document relates is available in the United Kingdom
only to relevant persons and will be engaged in only with such persons.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Any invitation or inducement to engage in investment
activity (within the meaning of Section 21 of the FSMA) may only be communicated or caused to be communicated in connection with the issue
or sale of the securities in circumstances in which Section 21(1) of the FSMA does not apply. All applicable provisions of the FSMA and
the Order must be complied with in respect of anything done by any person in relation to the securities in, from or otherwise involving
the United Kingdom.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt 0.25in">Switzerland</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The securities may not be publicly offered
in Switzerland and will not be listed on the SIX Swiss Exchange (the &ldquo;SIX&rdquo;) or on any other stock exchange or regulated trading
facility in Switzerland. This document has been prepared without regard to the disclosure standards for issuance prospectuses under art.
652a or art. 1156 of the Swiss Code of Obligations or the disclosure standards for listing prospectuses under art. 27 ff. of the SIX Listing
Rules or the listing rules of any other stock exchange or regulated trading facility in Switzerland. Neither this document nor any other
offering or marketing material relating to the securities or the offering may be publicly distributed or otherwise made publicly available
in Switzerland.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Neither this document nor any other offering
or marketing material relating to the offering, or the securities have been or will be filed with or approved by any Swiss regulatory
authority. In particular, this document will not be filed with, and the offer of securities will not be supervised by, the Swiss Financial
Market Supervisory Authority FINMA, and the offer of securities has not been and will not be authorized under the Swiss Federal Act on
Collective Investment Schemes (&ldquo;CISA&rdquo;). Accordingly, no public distribution,</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt">offering or advertising, as defined in CISA, its implementing ordinances
and notices, and no distribution to any non-qualified investor, as defined in CISA, its implementing ordinances and notices, shall be
undertaken in or from Switzerland, and the investor protection afforded to acquirers of interests in collective investment schemes under
CISA does not extend to acquirers of securities.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt 0.25in">Australia</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">No placement document, prospectus, product
disclosure statement or other disclosure document has been lodged with the Australian Securities and Investments Commission (&ldquo;ASIC&rdquo;),
in relation to the offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">This prospectus does not constitute a prospectus,
product disclosure statement or other disclosure document under the Corporations Act 2001 (the &ldquo;Corporations Act&rdquo;) and does
not purport to include the information required for a prospectus, product disclosure statement or other disclosure document under the
Corporations Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">Any offer in Australia of the securities may
only be made to persons (the &ldquo;Exempt Investors&rdquo;) who are &ldquo;sophisticated investors&rdquo; (within the meaning of section
708(8) of the Corporations Act), &ldquo;professional investors&rdquo; (within the meaning of section 708(11) of the Corporations Act)
or otherwise pursuant to one or more exemptions contained in section 708 of the Corporations Act so that it is lawful to offer the securities
without disclosure to investors under Chapter 6D of the Corporations Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The securities applied for by Exempt Investors
in Australia must not be offered for sale in Australia in the period of 12 months after the date of allotment under the offering, except
in circumstances where disclosure to investors under Chapter 6D of the Corporations Act would not be required pursuant to an exemption
under section 708 of the Corporations Act or otherwise or where the offer is pursuant to a disclosure document which complies with Chapter
6D of the Corporations Act. Any person acquiring securities must observe such Australian on-sale restrictions.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">This prospectus contains general information
only and does not take account of the investment objectives, financial situation or particular needs of any particular person. It does
not contain any securities recommendations or financial product advice. Before making an investment decision, investors need to consider
whether the information in this prospectus is appropriate to their needs, objectives and circumstances, and, if necessary, seek expert
advice on those matters.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt 0.25in">Notice to Prospective Investors in the Cayman
Islands</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">No invitation, whether directly or indirectly,
may be made to the public in the Cayman Islands to subscribe for our securities.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt 0.25in">Taiwan</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The securities have not been and will not be
registered with the Financial Supervisory Commission of Taiwan pursuant to relevant securities laws and regulations and may not be sold,
issued or offered within Taiwan through a public offering or in circumstances which constitutes an offer within the meaning of the Securities
and Exchange Act of Taiwan that requires a registration or approval of the Financial Supervisory Commission of Taiwan. No person or entity
in Taiwan has been authorized to offer, sell, give advice regarding or otherwise intermediate the offering and sale of the securities
in Taiwan.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt 0.25in">Notice to Prospective Investors in Hong Kong</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The contents of this prospectus have not been
reviewed by any regulatory authority in Hong Kong. You are advised to exercise caution in relation to the offer. If you are in any doubt
about any of the contents of this prospectus, you should obtain independent professional advice. Please note that (i) our shares may not
be offered or sold in Hong Kong, by means of this prospectus or any document other than to &ldquo;professional investors&rdquo; within
the meaning of Part I of Schedule 1 of the Securities and Futures Ordinance (Cap.571, Laws of Hong Kong) (&ldquo;SFO&rdquo;) and any rules
made thereunder, or in other circumstances which do not result in the document being a &ldquo;prospectus&rdquo; within the meaning of
the Companies (Winding Up and Miscellaneous Provisions) Ordinance (Cap.32, Laws of Hong Kong) (&ldquo;CWUMPO&rdquo;) or which do not constitute
an offer or invitation to the public for the purpose of the CWUMPO or the SFO, and (ii) no advertisement, invitation or document relating
to our shares may be issued or may be in the possession of any person for the purpose of issue (in each case whether in Hong Kong or elsewhere)
which is directed at, or the contents of which are likely to be accessed or read by, the public in Hong Kong (except if permitted to do
so under the securities laws of Hong Kong) other than with respect to the shares which are or are intended to be disposed of only to persons
outside Hong Kong or only to &ldquo;professional investors&rdquo; within the meaning of the SFO and any rules made thereunder.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt 0.25in">Notice to Prospective Investors in the People&rsquo;s
Republic of China</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">This prospectus may not be circulated or distributed
in the People&rsquo;s Republic of China (the &ldquo;PRC&rdquo;) and the shares may not be offered or sold, and will not offer or sell
to any person for re-offering or resale directly or indirectly to any resident of the PRC except pursuant to applicable laws, rules and
regulations of the PRC. For the purpose of this paragraph only, the PRC does not include Taiwan and the special administrative regions
of Hong Kong and Macau.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt 0.25in">Israel</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">This document does not constitute a prospectus
under the Israeli Securities Law, 5728-1968 (the &ldquo;Securities Law&rdquo;) and has not been filed with or approved by the Israel Securities
Authority. In the State of Israel, this document is being distributed only to, and is directed only at, and any offer of the shares is
directed only at, investors listed in the first addendum (the &ldquo;Addendum&rdquo;) to the Securities Law, consisting primarily of joint
investment in trust funds, provident funds, insurance companies, banks, portfolio managers, investment advisors, members of the Tel Aviv
Stock Exchange, underwriters, venture capital funds, entities with equity in excess of NIS 50 million and &ldquo;qualified individuals&rdquo;,
each as defined in the Addendum (as it may be amended from time to time), collectively referred to as qualified investors (in each case
purchasing for their own account or, where permitted under the Addendum, for the accounts of their clients who are investors listed in
the Addendum). Qualified investors will be required to submit written confirmation that they fall within the scope of the Addendum, are
aware of the meaning of same and agree to it.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Toc194695864"></A><A NAME="a_Toc195656912"></A>Legal
Matters</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The validity of the Common Shares offered by
this prospectus supplement will be passed upon for us by Blake, Cassels &amp; Graydon LLP, Vancouver, British Columbia, Canada. The validity
of the Pre-Funded Warrants offered by this prospectus supplement will be passed upon for us by Jones Day. Maxim Group LLC is being represented
in connection with this offering by Ellenoff Grossman &amp; Schole LLP, New York, New York, as to U.S. legal matters, and Cozen O&rsquo;Connor
LLP, Toronto, Ontario, Canada, as to Canadian legal matters.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><A NAME="a_Toc194695865"></A><A NAME="a_Toc195656913"></A>Experts</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The consolidated financial statements of NioCorp
Developments Ltd. as of June 30, 2024, and for the year then ended, incorporated by reference in this Prospectus have been audited by
Deloitte &amp; Touche LLP, an independent registered public accounting firm, as stated in their report. Such financial statements are
incorporated by reference in reliance upon the report of such firm given their authority as experts in accounting and auditing.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The consolidated financial statements of NioCorp
Developments Ltd. as of June 30, 2023 and for the year then ended incorporated by reference in this prospectus supplement have been so
incorporated in reliance on the report of BDO USA, P.C., an independent registered public accounting firm, given on the authority of said
firm as experts in auditing and accounting. The report on the consolidated financial statements contains an explanatory paragraph regarding
the Company&rsquo;s ability to continue as a going concern.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-indent: 0.25in">The technical report summary for the Elk Creek
Project prepared in accordance with subpart 1300 of Regulation S-K (the &ldquo;S-K 1300 Elk Creek Technical Report Summary&rdquo;), which
is incorporated by reference in this prospectus supplement and the accompanying prospectus, and the information summarized or quoted from
the S-K 1300 Elk Creek Technical Report Summary included or incorporated by reference in this prospectus supplement and the accompanying
prospectus have been so included or incorporated by reference with the consent of the following qualified persons, as such term is defined
in Item 1300 of Regulation S-K, who prepared the S-K 1300 Elk Creek Technical Report Summary and reviewed and approved such information
summarized or quoted therefrom included or incorporated by reference in this prospectus supplement and the accompanying prospectus: Dahrouge
Geological Consulting USA Ltd.; Understood Mineral Resources Ltd.; Optimize Group; Tetra Tech; Adrian Brown Consultants Inc.; Metallurgy
Concept Solutions; Magemi Mining Inc.; L3 Process Development; Olsson; A2GC; Scott Honan, M.Sc, SME-RM, NioCorp; Cementation; Mahmood
Khwaja, P.E., CDM Smith; and Wynand Marx, M.Eng, BBE Consulting. A matrix of the sections of the S-K 1300 Elk Creek Technical Report Summary
for which each qualified person is responsible is included in the S-K 1300 Elk Creek Technical Report Summary. Except for Scott Honan,
none of the qualified persons is affiliated with NioCorp. Mr. Honan is the Chief Operating Officer of NioCorp.</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&thinsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; color: #C00000">&#8201;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>PROSPECTUS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><IMG SRC="n2574_img003.jpg" ALT=""><FONT STYLE="font-size: 10pt; color: red"></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&#160;</P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><B>NioCorp Developments Ltd.</B></P>

<P STYLE="font: 14pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><B>$200,000,000</B></P>

<P STYLE="font: 14pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Common Shares </B></P>

<P STYLE="font: 14pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Common Share Purchase Warrants</B></P>

<P STYLE="font: 14pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center"><B>Units</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">We may offer and sell,
from time to time, common shares, without par value (&#8220;Common Shares&#8221;), or Common Share purchase warrants (&#8220;Warrants&#8221;),
as well as units that include any of these securities, or any combination thereof. We may sell any combination of these securities in
one or more offerings with an aggregate offering price of up to $200,000,000.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">This prospectus describes
the general manner in which the securities listed above may be offered and sold. The specific manner in which such securities may be offered
and sold will be described in one or more prospectus supplements. You should carefully read this prospectus and any accompanying prospectus
supplement, together with the documents we incorporate by reference, before you invest in our securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">We may sell securities
directly or to or through underwriters or dealers, and also to other purchasers or through agents. The names of any underwriters or agents
that are included in a sale of such securities to you, and any applicable commissions or discounts, will be stated in an accompanying
prospectus supplement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">Our Common Shares trade on The Nasdaq Global Market
under the symbol &#8220;NB.&#8221; On June 12, 2024, the last reported sale price of our Common Shares on The Nasdaq Global Market was
$2.14 per Common Share.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in"><B>Investing in our securities involves a high degree
of risk. See &#8220;Risk Factors&#8221; beginning on page 2 of this prospectus.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in"><B>&#160;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in"><B>Neither the Securities and Exchange Commission
nor any state securities commission has approved or disapproved of the securities or determined if this prospectus is truthful or complete.
Any representation to the contrary is a criminal offense.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0pt 1in; text-align: center">The date of this prospectus is June 27, 2024.</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B>Table of
Contents</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: right"><B>Page</B></P>



<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%">
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom">
    <TD STYLE="width: 90%; text-align: left; padding-top: 0in; padding-bottom: 5pt; padding-left: 0in"><A HREF="#a_Toc168935653">About This Prospectus</A></TD>
    <TD STYLE="width: 10%; text-align: right; padding-top: 0in; padding-bottom: 5pt"><A HREF="#a_Toc168935653">ii</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom">
    <TD STYLE="text-align: left; padding-top: 0in; padding-bottom: 5pt; padding-left: 0in"><A HREF="#a_Toc168935654">Where You Can Find More Information</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in; padding-bottom: 5pt"><A HREF="#a_Toc168935654">iii</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom">
    <TD STYLE="text-align: left; padding-top: 0in; padding-bottom: 5pt; padding-left: 0in"><A HREF="#a_Toc168935655">Information Incorporated by Reference</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in; padding-bottom: 5pt"><A HREF="#a_Toc168935655">iv</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom">
    <TD STYLE="text-align: left; padding-top: 0in; padding-bottom: 5pt; padding-left: 0in"><A HREF="#a_Toc168935656">Summary</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in; padding-bottom: 5pt"><A HREF="#a_Toc168935656">1</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom">
    <TD STYLE="text-align: left; padding-top: 0in; padding-bottom: 5pt; padding-left: 0in"><A HREF="#a_Toc168935657">Risk Factors</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in; padding-bottom: 5pt"><A HREF="#a_Toc168935657">2</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom">
    <TD STYLE="text-align: left; padding-top: 0in; padding-bottom: 5pt; padding-left: 0in"><A HREF="#a_Toc168935658">Cautionary Note Regarding Forward-Looking Statements</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in; padding-bottom: 5pt"><A HREF="#a_Toc168935658">3</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom">
    <TD STYLE="text-align: left; padding-top: 0in; padding-bottom: 5pt; padding-left: 0in"><A HREF="#a_Toc168935659">Use of Proceeds</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in; padding-bottom: 5pt"><A HREF="#a_Toc168935659">5</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom">
    <TD STYLE="text-align: left; padding-top: 0in; padding-bottom: 5pt; padding-left: 0in"><A HREF="#a_Toc168935660">Description of Capital Stock</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in; padding-bottom: 5pt"><A HREF="#a_Toc168935660">6</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom">
    <TD STYLE="text-align: left; padding-top: 0in; padding-bottom: 5pt; padding-left: 0in"><A HREF="#a_Toc168935661">Description of Warrants</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in; padding-bottom: 5pt"><A HREF="#a_Toc168935661">14</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom">
    <TD STYLE="text-align: left; padding-top: 0in; padding-bottom: 5pt; padding-left: 0in"><A HREF="#a_Toc168935662">Description of Units</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in; padding-bottom: 5pt"><A HREF="#a_Toc168935662">16</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom">
    <TD STYLE="text-align: left; padding-top: 0in; padding-bottom: 5pt; padding-left: 0in"><A HREF="#a_Toc168935663">Plan of Distribution</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in; padding-bottom: 5pt"><A HREF="#a_Toc168935663">17</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom">
    <TD STYLE="text-align: left; padding-top: 0in; padding-bottom: 5pt; padding-left: 0in"><A HREF="#a_Toc168935664">Legal Matters</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in; padding-bottom: 5pt"><A HREF="#a_Toc168935664">19</A></TD></TR>
  <TR STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; vertical-align: bottom">
    <TD STYLE="text-align: left; padding-top: 0in; padding-bottom: 5pt; padding-left: 0in"><A HREF="#a_Toc168935665">Experts</A></TD>
    <TD STYLE="text-align: right; padding-top: 0in; padding-bottom: 5pt"><A HREF="#a_Toc168935665">20</A></TD></TR>
</TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 1in">&#160;</P>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&#160;</P>


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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 0pt"><P STYLE="margin: 0pt">&#160;</P></DIV>
    <!-- Field: /Page -->


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT ID="a_Toc86514279"></FONT><FONT ID="a002_v1"></FONT><FONT ID="a003_v1"></FONT><FONT ID="a004_v1"></FONT>&#160;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><FONT ID="a_Toc168935653"></FONT>
About This Prospectus</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in"><FONT ID="a_Hlk168477456"></FONT>This prospectus is part
of a registration statement on Form S-3 that we filed with the Securities and Exchange Commission (the &#8220;SEC&#8221;) using a &#8220;shelf&#8221;
registration process. <FONT ID="a_Hlk168482857"></FONT>The Company may offer and sell from time to time any combination of the securities
described in this prospectus in one or more offerings in amounts, at prices and on terms that we determine at the time of the offering,
with an aggregate offering price of up to $200,000,000. This prospectus provides you with a general description of the securities we may
offer.&#160;Each time we offer securities under this prospectus, we will provide a prospectus supplement that will contain specific information
about the type or series of securities offered and the terms of that offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in"><B>This prospectus may not be used to consummate a
sale of securities unless it is accompanied by a prospectus supplement.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">You should rely only on the information provided in
this prospectus, as well as the information incorporated by reference into this prospectus and any applicable prospectus supplement. We
have not authorized anyone to provide you with different information. We have not authorized anyone to provide you with any information
or to make any representations other than those contained in this prospectus or any applicable prospectus supplement or any free writing
prospectuses prepared by or on behalf of us or to which we have referred you. We do not take responsibility for, and can provide no assurance
as to the reliability of, any other information that others may give you. You should not assume that the information in this prospectus
or any applicable prospectus supplement is accurate as of any date other than the date of the applicable document. Since the date of this
prospectus and the documents incorporated by reference into this prospectus, our business, financial condition, results of operations
and prospects may have changed. We will not make an offer to sell these securities in any jurisdiction where the offer or sale is not
permitted.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">We may also provide a prospectus supplement or post-effective
amendment to the registration statement of which this prospectus is a part to add information to, or update or change information contained
in, this prospectus and the registration statement of which this prospectus is a part. You should read this prospectus and any applicable
prospectus supplement or post-effective amendment to the registration statement of which this prospectus is a part together with the additional
information to which we refer you in the sections of this prospectus entitled &#8220;Where You Can Find More Information&#8221; and &#8220;Information
Incorporated by Reference.&#8221;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in"><I>Unless we state otherwise or the context otherwise
requires, the terms &#8220;we,&#8221; &#8220;us,&#8221; &#8220;our,&#8221; &#8220;our business&#8221; &#8220;NioCorp,&#8221; &#8220;the
Company&#8221; and similar references refer to NioCorp Developments Ltd. and its consolidated subsidiaries.</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in"><I>Unless we state otherwise or the context otherwise
requires, the term &#8220;ECRC&#8221; refers to Elk Creek Resources Corp. (formerly known as GX Acquisition Corp. II), a Delaware corporation
and a majority-owned subsidiary of NioCorp, as the surviving entity of the mergers that occurred on March 17, 2023, as part of the Transactions
(as defined herein), and the term &#8220;GXII&#8221; refers to GX Acquisition Corp. II, a Delaware corporation, as it existed prior to
the closing of the Transactions.</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">This prospectus contains
our registered and unregistered trademarks and service marks, as well as trademarks and service marks of third parties. Solely for convenience,
these trademarks and service marks are referenced without the &#174;, &#8482; or similar symbols, but such references are not intended
to indicate, in anyway, that we will not assert, to the fullest extent under applicable law, our rights to these trademarks and service
marks. All brand names, trademarks and service marks appearing in this prospectus are the property of their respective holders.</P>


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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><FONT ID="a_Toc168935654"></FONT>
Where You Can Find More Information</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">This prospectus is part of a registration statement
on Form S-3 that we filed with the SEC under the Securities Act of 1933 (the &#8220;Securities Act&#8221;) and does not contain all the
information set forth or incorporated by reference in the registration statement. Whenever a reference is made in this prospectus to any
of our contracts, agreements or other documents, the reference may not be complete and you should refer to the exhibits that are a part
of the registration statement of which this prospectus is a part or the exhibits to the reports or other documents incorporated by reference
into this prospectus for a copy of such contract, agreement or other document. You may obtain copies of the registration statement and
its exhibits via the SEC&#8217;s EDGAR database.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">We file annual, quarterly and current reports, proxy
statements and other information with the SEC under the Securities Exchange Act of 1934 (the &#8220;Exchange Act&#8221;). The SEC maintains
a website that contains reports, proxy and information statements and other information regarding issuers, including us, that file electronically
with the SEC. You may obtain documents that we file with the SEC at www.sec.gov.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0pt 1in; text-align: justify; text-indent: 0.25in">We make available, free
of charge, on our website at&#160;www.niocorp<I>.</I>com, our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports
on Form 8-K, proxy statements and amendments to those reports and statements as soon as reasonably practicable after they are filed with
the SEC. We do not incorporate the information on or accessible through any website into this prospectus or any prospectus supplement,
and you should not consider any information on, or that can be accessed through, any website as part of this prospectus or any prospectus
supplement (other than those filings with the SEC that we specifically incorporate by reference into this prospectus or any prospectus
supplement). Our website address and the SEC&#8217;s website address are included in this prospectus as inactive textual references only.</P>


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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><FONT ID="a_Toc168935655"></FONT>
Information Incorporated by Reference</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">SEC rules permit us to incorporate information by
reference into this prospectus and any applicable prospectus supplement. This means that we can disclose important information to you
by referring you to another document filed separately with the SEC. The information incorporated by reference is considered to be part
of this prospectus and any applicable prospectus supplement, except for information superseded by information contained in this prospectus
or the applicable prospectus supplement itself or in any subsequently filed incorporated document. This prospectus and any applicable
prospectus supplement incorporate by reference the documents set forth below that we have previously filed with the SEC, other than information
in such documents that is deemed to be furnished and not filed. These documents contain important information about us and our business
and financial condition. Any report or information within any of the documents referenced below that is furnished, but not filed, shall
not be incorporated by reference into this prospectus:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD><FONT STYLE="font-size: 10pt">our Annual Report on Form 10-K for the fiscal year ended June 30, 2023, filed with the SEC on <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723001700/n2574_x163-10k.htm" STYLE="-sec-extract: exhibit">October 6, 2023</A>; </FONT></TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" BORDER="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-bottom: 6pt">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 0.5in">&nbsp;</TD>
  <TD STYLE="text-align: justify; padding-left: 0pt; text-indent: 0pt; width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD>
  <TD STYLE="text-align: justify; padding-left: 0pt; text-indent: 0pt"><FONT STYLE="font-size: 10pt">our Quarterly Reports on Form 10-Q for the quarterly period ended September 30, 2023, filed with the SEC
on <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723001892/n2574_x170-10q.htm" STYLE="-sec-extract: exhibit">November
13, 2023</A>, for the quarterly period ended December 31, 2023, filed with the SEC on <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724000311/n2574_x189-10q.htm" STYLE="-sec-extract: exhibit">February
13, 2024</A>, and for the quarterly period ended March 31, 2024, filed with the SEC on <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724000937/n2574_x208-10q.htm" STYLE="-sec-extract: exhibit">May
2, 2024</A>;</FONT></TD></TR>
</TABLE>


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<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD><FONT STYLE="font-size: 10pt">our Current Reports on Form 8-K, filed with the SEC on <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723000363/n2574-x89_8k.htm" STYLE="-sec-extract: exhibit">March 1, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723001523/n2574_x155-8k.htm" STYLE="-sec-extract: exhibit">September 1, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723001529/n2574_x157-8k.htm" STYLE="-sec-extract: exhibit">September 7, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723001582/n2574_x158-8k.htm" STYLE="-sec-extract: exhibit">September 12, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723001589/n2574_x159-8k.htm" STYLE="-sec-extract: exhibit">September 13, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723001607/n2574_8k-x160.htm" STYLE="-sec-extract: exhibit">September 18, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723001719/n2574_8k-x167.htm" STYLE="-sec-extract: exhibit">October 13, 2023</A> (as amended by our Current Report on Form 8-K/A filed
on <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723002127/n2574_x180-8ka.htm" STYLE="-sec-extract: exhibit">December 7, 2023</A>), <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723002022/n2574_x175-8k.htm" STYLE="-sec-extract: exhibit">November 27, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723002030/n2574_x176-8k.htm" STYLE="-sec-extract: exhibit">November 28, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723002071/n2574_x177-8k.htm">December 1, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723002128/n2574_x179-8k.htm" STYLE="-sec-extract: exhibit">December 7, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723002192/n2574_x183-8k.htm" STYLE="-sec-extract: exhibit">December 14, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949723002204/n2574_x184-8k.htm" STYLE="-sec-extract: exhibit">December 20, 2023</A>,
<A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724000066/n2574_x188-8k.htm" STYLE="-sec-extract: exhibit">January 22, 2024</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724000601/n2574_x201-8k.htm" STYLE="-sec-extract: exhibit">February 28, 2024</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724000608/n2574_x202-8k.htm" STYLE="-sec-extract: exhibit">March 5, 2024</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724000616/n2574_x203-8k.htm" STYLE="-sec-extract: exhibit">March 7, 2024</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724000657/n2574_x204-8k.htm" STYLE="-sec-extract: exhibit">March 12, 2024</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724000693/n2574_x205-8k.htm" STYLE="-sec-extract: exhibit">March 14, 2024</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724000818/n2574_x206-8k.htm" STYLE="-sec-extract: exhibit">April 12, 2024</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724000844/n2574_x207-8k.htm" STYLE="-sec-extract: exhibit">April 17, 2024</A> and
<A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1512228/000153949724000948/n2574_x209-8k.htm" STYLE="-sec-extract: exhibit">May 3, 2024</A>; and</FONT></TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD><FONT STYLE="font-size: 10pt">a description of our Common Shares, contained in our Registration Statement on Form 8-A, filed with
the SEC on <A HREF="https://www.sec.gov/Archives/edgar/data/1512228/000153949723000456/n2574_x102-8a12b.htm" STYLE="-sec-extract: exhibit">March 17, 2023</A>, and any subsequently filed amendments and reports filed for the purpose of updating that description.</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">We also incorporate by reference any future filings
made by us with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Exchange Act (excluding any information furnished to, rather than
filed with, the SEC), including after the date of the initial registration statement of which this prospectus is a part and prior to effectiveness
of the registration statement, and after effectiveness of the registration statement and prior to the termination of the offering of the
securities made by this prospectus. Information in such future filings updates and supplements the information provided in this prospectus.
Any statements in any such future filings will automatically be deemed to modify and supersede any information in any document we previously
filed with the SEC that is incorporated or deemed to be incorporated herein by reference to the extent that statements in the later filed
document modify or replace such earlier statements.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">You may request a copy of these filings, at no cost,
by writing or calling us at the following address or telephone number below:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 12pt 0 0; text-align: center; background-color: white">NioCorp Developments
Ltd.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; background-color: white">7000 South Yosemite Street,
Suite 115</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; background-color: white">Centennial, Colorado 80112</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center; background-color: white">(720) 334-7066</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center; background-color: white">Attn: Corporate Secretary</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">Those copies will not include exhibits, unless the
exhibits have specifically been incorporated by reference in this document or you specifically request them.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">&#160;</P>


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<DIV STYLE="border: Black 1pt solid; padding-right: 3pt; padding-left: 3pt">

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 5pt 0pt 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><FONT ID="a_Toc168935656"></FONT><FONT ID="a_Toc86514281"></FONT>Summary</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify; margin-right: 0; margin-left: 0; text-indent: 0.5in"><I>This
summary highlights selected information appearing in this prospectus. Because it is a summary, it may not contain all of the information
that may be important to you. To understand this offering fully, you should read this entire prospectus carefully, including the information
set forth in the section entitled &#8220;Risk Factors&#8221; contained in this prospectus and under similar headings in the other documents
that are incorporated by reference into this prospectus. You should also carefully read the information incorporated by reference into
this prospectus, including our consolidated financial statements and related notes and the exhibits to the registration statement of which
this prospectus is a part, before making an investment decision. This prospectus includes forward-looking statements that involve risks
and uncertainties. See &#8220;Cautionary Note Regarding Forward-Looking Statements.&#8221;</I></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">NioCorp Developments
Ltd.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">NioCorp is developing the Elk Creek Project (as defined
below) located in southeast Nebraska. The &#8220;Elk Creek Project&#8221; is a development-stage property that has disclosed niobium,
scandium, and titanium reserves and resources and disclosed rare earth mineral resources. The Company is continuing technical and economic
studies around the rare earths contained in the Elk Creek Project&#8217;s mineral resource in order to determine whether extraction of
rare earth elements can be reasonably justified and economically viable after taking into account all relevant factors. Niobium is used
to produce various superalloys that are extensively used in high performance aircraft and jet turbines. It also is used in high-strength,
low-alloy steel, a stronger steel used in automobiles, bridges, structural systems, buildings, pipelines, and other applications that
generally increases strength and/or reduces weight, which can result in environmental benefits, including reduced fuel consumption and
material usage and fewer air emissions. Scandium can be combined with aluminum to make high-performance alloys with increased strength
and improved corrosion resistance. Scandium also is a critical component of advanced solid oxide fuel cells, an environmentally preferred
technology for high-reliability, distributed electricity generation. Titanium is a component of various superalloys and other applications
that are used for aerospace applications, weapons systems, protective armor, medical implants, and many others. It also is used in pigments
for paper, paint, and plastics. Rare earths are critical to electrification and decarbonization initiatives and can be used to manufacture
the strongest permanent magnets commercially available.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">Our primary business strategy is to advance our Elk
Creek Project to commercial production. We are focused on obtaining additional funds to carry out our near-term planned work programs
associated with securing the project financing necessary to complete mine development and construction of the Elk Creek Project.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">Corporate Information</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0pt 1in; text-indent: 0.25in">Our Common Shares trade on The Nasdaq Global Market
under the symbol &#8220;NB.&#8221; Our principal executive office is located at 7000 South Yosemite Street, Suite 115, Centennial, CO
80112, and our telephone number is (720) 334-7066. Our website address is&#160;<I>www.niocorp.com</I>. This website address is not intended
to be an active link, and information on, or accessible through, our website is not incorporated by reference into this prospectus and
you should not consider any information on, or that can be accessed from, our website as part of this prospectus or any accompanying prospectus
supplement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

</DIV>


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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><FONT ID="a_Toc86514282"></FONT><FONT ID="a_Toc168935657"></FONT>
Risk Factors</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0pt 1in; text-indent: 0.5in">Investing in our securities involves a high degree
of risk. Prior to making a decision about investing in our securities, you should carefully consider the specific risk factors discussed
under the heading &#8220;Risk Factors&#8221; in our most recent Annual Report on Form&#8201;10-K&#8201;and in our most recent Quarterly
Reports on Form&#8201;10-Q,&#8201;which are or will be incorporated herein by reference and may be amended, supplemented or superseded
from time to time by other reports we file with the SEC in the future. You should also refer to the other information in this prospectus
and the applicable prospectus supplement, including our financial statements and the related notes incorporated by reference in this prospectus.
The risks and uncertainties we have described are not the only risks we face. Additional risks and uncertainties not presently known to
us or that we currently deem immaterial may also affect our operations. If any of these risks actually occurs, our business, results of
operations and financial condition could suffer and could result in a complete loss of your investment.</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">&#160;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><FONT ID="a_Toc168935658"></FONT><FONT ID="a_Toc86514283"></FONT>Cautionary Note Regarding Forward-Looking Statements</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify; text-indent: 0.25in; margin-right: 0; margin-left: 0">This prospectus
and the other documents incorporated by reference into this prospectus contain or may contain &#8220;forward-looking statements&#8221;
within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act, and &#8220;forward-looking information&#8221;
within the meaning of applicable Canadian securities legislation (collectively, &#8220;forward-looking statements&#8221;). Such forward-looking
statements concern our anticipated results and developments in the operations of the Company in future periods, planned exploration activities,
the adequacy of the Company&#8217;s financial resources, and other events or conditions that may occur in the future.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify; text-indent: 0.25in; margin-right: 0; margin-left: 0">Forward-looking
statements have been based upon our current business and operating plans, as approved by the Company&#8217;s Board of Directors, and may
include statements regarding the anticipated benefits of the transactions contemplated by the Business Combination Agreement (the &#8220;Business
Combination Agreement&#8221;), dated September 25, 2022, between NioCorp, GXII, Big Red Merger Sub Ltd, a Delaware corporation and a direct,
wholly owned subsidiary of the Company (the &#8220;Transactions&#8221;), including NioCorp&#8217;s ability to access the full amount of
the expected net proceeds of the Standby Equity Purchase Agreement, dated January 26, 2023 (as amended, the &#8220;Yorkville Equity Facility
Financing Agreement&#8221;), between NioCorp and YA II PN, Ltd. (&#8220;YA&#8221;), a fund managed by Yorkville Advisors Global, LP, through
April 1, 2026; NioCorp&#8217;s ability to receive a final commitment of financing from the Export-Import Bank of the United States (&#8220;EXIM&#8221;);
anticipated benefits of the listing of the Common Shares on Nasdaq; the financial and business performance of NioCorp; NioCorp&#8217;s
anticipated results and developments in the operations of NioCorp in future periods; NioCorp&#8217;s planned exploration and development
activities; the adequacy of NioCorp&#8217;s financial resources; NioCorp&#8217;s ability to secure sufficient project financing to complete
construction and commence operation of the Elk Creek Project; NioCorp&#8217;s expectation and ability to produce niobium, scandium, and
titanium at the Elk Creek Project; NioCorp&#8217;s plans to produce and supply specific products and market demand for those products;
the Elk Creek Project&#8217;s ability to produce multiple critical metals; NioCorp&#8217;s expectation that the process improvements resulting
from previously completed recovery process improvement testing could lead to greater efficiencies and cost savings in the Elk Creek Project;
the Elk Creek Project&#8217;s projected ore production and mining operations over its expected mine life; the completion and content of
an updated technical report for the Elk Creek Project; the completion of technical and economic analyses on the potential addition of
magnetic rare earth oxides to NioCorp&#8217;s planned product suite; anticipated benefits of the electrification of access to the Elk
Creek Project mine site; the exercise of options to purchase additional land parcels; the execution of contracts with engineering, procurement
and construction companies; the advancement of offtake discussions with potential customers; NioCorp&#8217;s ongoing evaluation of the
impact of inflation, supply chain issues and geopolitical unrest on the Elk Creek Project&#8217;s economic model; and the creation of
full time and contract construction jobs over the construction period of the Elk Creek Project.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify; text-indent: 0.25in; margin-right: 0; margin-left: 0">Forward-looking
statements are frequently, but not always, identified by words such as &#8220;expects,&#8221; &#8220;anticipates,&#8221; &#8220;believes,&#8221;
&#8220;intends,&#8221; &#8220;estimates,&#8221; &#8220;potential,&#8221; &#8220;possible,&#8221; and similar expressions, or statements
that events, conditions, or results &#8220;will,&#8221; &#8220;may,&#8221; &#8220;could,&#8221; or &#8220;should&#8221; (or the negative
and grammatical variations of any of these terms) occur or be achieved. Any statements that express or involve discussions with respect
to predictions, expectations, beliefs, plans, projections, objectives, assumptions, or future events or performance (often, but not always,
using words or phrases such as &#8220;expects&#8221; or &#8220;does not expect,&#8221; &#8220;is expected,&#8221; &#8220;anticipates&#8221;
or &#8220;does not anticipate,&#8221; &#8220;plans,&#8221; &#8220;estimates,&#8221; or &#8220;intends,&#8221; or stating that certain
actions, events, or results &#8220;may,&#8221; &#8220;could,&#8221; &#8220;would,&#8221; &#8220;might,&#8221; or &#8220;will&#8221; be
taken, occur or be achieved) are not statements of historical fact and may be forward-looking statements. Such forward-looking statements
reflect the Company&#8217;s current views with respect to future events and are subject to certain known and unknown risks, uncertainties,
and assumptions. Many factors could cause actual results, performance, or achievements to be materially different from any future results,
performance, or achievements that may be expressed or implied by such forward-looking statements, including, among others, risks related
to the following: NioCorp&#8217;s ability to recognize the anticipated benefits of the Transactions, including NioCorp&#8217;s ability
to access the full amount of the expected net proceeds under the Yorkville Equity Facility Financing Agreement through April 1, 2026;
unexpected costs related to the Transactions; the outcome of any legal proceedings that may be instituted against NioCorp following closing
of the Transactions; NioCorp&#8217;s ability to receive a final commitment of financing from EXIM on the anticipated timeline, on acceptable
terms, or at all; NioCorp&#8217;s ability to continue to meet Nasdaq listing standards; NioCorp&#8217;s ability to operate as a going
concern; risks relating to the Common Shares, including price volatility, lack of dividend payments and dilution or the perception of
the likelihood any of the foregoing; NioCorp&#8217;s requirement of significant additional capital; the extent to which NioCorp&#8217;s
level of indebtedness and/or the terms contained in agreements governing NioCorp&#8217;s indebtedness or the Yorkville Equity Facility
Financing Agreement may impair NioCorp&#8217;s ability to obtain additional financing, on acceptable terms, or at all; covenants contained
in agreements with NioCorp&#8217;s secured creditors that may affect its assets; NioCorp&#8217;s limited operating history; NioCorp&#8217;s
history of losses; the material weaknesses in NioCorp&#8217;s internal control over financial reporting, NioCorp&#8217;s efforts to remediate
such material weaknesses and the timing of remediation; the possibility that NioCorp may qualify as a passive foreign investment company
(&#8220;PFIC&#8221;) under the U.S. Internal Revenue Code of 1986, as amended (the &#8220;Code&#8221;); the potential that the Transactions
could result in NioCorp becoming subject to materially adverse U.S. federal income tax consequences as a result of the application of
Section 7874 and related sections of the Code; cost increases for NioCorp&#8217;s exploration and, if warranted, development projects;
a disruption in, or failure of, NioCorp&#8217;s information technology systems, including those related to cybersecurity; equipment and
supply shortages; variations in the market demand for, and prices of, niobium, scandium, titanium and rare earth products; current and
future offtake agreements, joint ventures, and partnerships; NioCorp&#8217;s ability to attract qualified management; the effects of
global health crises on NioCorp&#8217;s business plans, financial condition and liquidity; estimates of mineral resources and reserves;
mineral exploration and production activities; feasibility study results; the results of metallurgical testing; the results of technological
research; changes in demand for and price of commodities (such as fuel and electricity) and currencies; competition in the mining industry;
changes or disruptions in the securities markets; legislative, political or economic developments, including changes in federal and/or
state laws that may significantly affect the mining industry; the impacts of climate change, as well as actions taken or required by
governments related to strengthening resilience in the face of potential impacts from climate change; the need to obtain permits and
comply with laws and regulations and other regulatory requirements; the timing and reliability of sampling and assay data; the possibility
that actual results of work may differ from projections/expectations or may not realize the perceived potential of NioCorp&#8217;s projects;
risks of accidents, equipment breakdowns, and labor disputes or other unanticipated difficulties or interruptions; the possibility of
cost overruns or unanticipated expenses in development programs; operating or technical difficulties in connection with exploration,
mining, or development activities; the management of the water balance at the Elk Creek Project site; land reclamation requirements related
to the Elk Creek Project; the speculative nature of mineral exploration and development, including the risks of diminishing quantities
of grades of reserves and resources; claims on the title to NioCorp&#8217;s properties; potential future litigation; and NioCorp&#8217;s
lack of insurance covering all of NioCorp&#8217;s operations.</P>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify; text-indent: 0.25in; margin-right: 0; margin-left: 0">Should
one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially
from those described herein. This list is not exhaustive of the factors that may affect any of the Company&#8217;s forward-looking statements.
Forward-looking statements are statements about the future and are inherently uncertain, and actual achievements of the Company or other
future events or conditions may differ materially from those reflected in the forward-looking statements due to a variety of risks, uncertainties,
and other factors, including without limitation those discussed under Part I, Item 1A. &#8220;Risk Factors&#8221; contained in our most
recent Annual Report on Form 10-K, and Part II, Item 1A. &#8220;Risk Factors&#8221; contained in our subsequent Quarterly Reports on Form
10-Q, as well as any amendments thereto, which are incorporated by reference into this prospectus and the applicable prospectus supplement
in their entirety, together with other information in this prospectus and the applicable prospectus supplement and the documents incorporated
by reference herein and therein. See the sections of this prospectus entitled &#8220;Where You Can Find More Information&#8221; and &#8220;Information
Incorporated by Reference.&#8221;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-bottom: 1in; text-align: justify; text-indent: 0.25in; margin-right: 0pt; margin-left: 0pt">The Company&#8217;s
forward-looking statements contained in this prospectus are based on the beliefs, expectations, and opinions of management as of the date
of this prospectus. The Company does not assume any obligation to update forward-looking statements if circumstances or management&#8217;s
beliefs, expectations, or opinions should change, except as required by law. For the reasons set forth above, investors should not attribute
undue certainty to, or place undue reliance on, forward-looking statements.<FONT ID="a_Toc86514284"></FONT></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify; text-indent: 0.25in; margin-right: 0; margin-left: 0">&#160;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><FONT ID="a_Toc168935659"></FONT>
Use of Proceeds</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">Unless the applicable
prospectus supplement states otherwise, we expect to use the net proceeds of the sale of the securities offered by this prospectus for
working capital and general corporate purposes, including to advance our efforts to launch construction of the Elk Creek Project and move
it to commercial operation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-bottom: 1in; text-indent: 0.25in; margin-right: 0pt; margin-left: 0pt">As of the date of this prospectus,
we have not identified as probable any specific material proposed uses of these proceeds. If, as of the date of any prospectus supplement,
we have identified any such uses, we will describe them in the prospectus supplement. Pending any such uses, we may temporarily invest
the net proceeds.</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; text-indent: 0.25in; margin-right: 0; margin-left: 0">&#160;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><FONT ID="a_Toc168935660"></FONT><FONT ID="a_Toc86514285"></FONT><FONT ID="a036_v1"></FONT><FONT ID="a037_v1"></FONT>
Description of Capital Stock</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">Common Shares</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">The authorized capital
of the Company consists of an unlimited number of Common Shares without par value, of which 37,576,647 were issued and outstanding as
of June 12, 2024. The holders of Common Shares are entitled to receive notice of and attend all meetings of shareholders, with each Common
Share held entitling the holder to one vote on any resolution to be passed at such shareholder meetings. The holders of Common Shares
are entitled to dividends if, as and when declared by the Company&#8217;s Board of Directors. The Common Shares are entitled, upon liquidation,
dissolution, or winding up of NioCorp, to receive the remaining assets of NioCorp available for distribution to shareholders. There are
no pre-emptive, conversion, or redemption rights attached to the Common Shares.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in"><FONT ID="a_Hlk168426906"></FONT>Exchange
Controls</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">There are no governmental
laws, decrees, or regulations in Canada that restrict the export or import of capital, including foreign exchange controls, or that affect
the remittance of dividends, interest or other payments to non-resident holders of the securities of NioCorp, other than as discussed
below and Canadian withholding tax. See &#8220;&#8212;Certain Canadian Federal Income Tax Considerations for U.S. Residents.&#8221;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt"><B><I>Certain Canadian Federal Income Tax Considerations for U.S.
Residents</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">The following generally
summarizes certain Canadian federal income tax consequences generally applicable under the <I>Income Tax Act</I> (Canada) and the regulations
enacted thereunder (collectively, the &#8220;Canadian Tax Act&#8221;) and the <I>Canada-United States Tax Convention (1980)</I> (the &#8220;Convention&#8221;)
to the holding and disposition of Common Shares.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">Comment is restricted
to holders of Common Shares each of whom, at all material times for the purposes of the Canadian Tax Act and the Convention, (i) is resident
solely in the United States for tax purposes, (ii) is a &#8220;qualifying person&#8221; under and entitled to the benefits of the Convention,
(iii) holds all Common Shares as capital property, (iv) holds no Common Shares that are &#8220;taxable Canadian property&#8221; (as defined
in the Canadian Tax Act) of the holder, (v) deals at arm&#8217;s length with and is not affiliated with the Company, (vi) does not and
is not deemed to use or hold any Common Shares in a business carried on in Canada, (vii) is not an insurer that carries on business in
Canada and elsewhere, (viii) is not an &#8220;authorized foreign bank&#8221; (as defined in the Canadian Tax Act), and (ix) has not entered
into a &#8220;derivative forward agreement&#8221; (as defined in the Canadian Tax Act) with respect to the Common Shares (each such holder,
a &#8220;U.S. Resident Holder&#8221;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">Certain U.S.-resident
entities that are fiscally transparent for United States federal income tax purposes (including limited liability companies) may not in
all circumstances be entitled to the benefits of the Convention. Members of or holders of an interest in such an entity that holds Common
Shares should consult their own tax advisers regarding the extent, if any, to which the benefits of the Convention will apply to the entity
in respect of its Common Shares.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">Generally, a U.S. Resident
Holder&#8217;s Common Shares will be considered to be capital property of such holder provided that the U.S. Resident Holder is not a
trader or dealer in securities, did not acquire, hold, or dispose of the Common Shares in one or more transactions considered to be an
adventure or concern in the nature of trade (<I>i.e.</I>, speculation), and does not hold the Common Shares in the course of carrying
on a business.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in"><FONT ID="a_Hlk532582769"></FONT>This
summary is based on the current provisions of the Canadian Tax Act and the Convention in effect as of the date prior to the date hereof,
all specific proposals to amend the Canadian Tax Act and Convention publicly announced by or on behalf of the Minister of Finance (Canada)
prior to the date hereof, and the current published administrative policies and assessing practices of the Canada Revenue Agency (the
&#8220;CRA&#8221;). It is assumed that all such amendments will be enacted as currently proposed, and that there will be no other material
change to any applicable law or administrative policy or assessing practice, whether by way of judicial, legislative or governmental decision
or action, although no assurance can be given in these respects. This summary is not exhaustive of all possible Canadian federal income
tax considerations. Except as otherwise expressly provided, this summary does not take into account any provincial, territorial, or foreign
tax considerations, which may differ materially from those set out herein.</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in"><B><I>This summary is
of a general nature only, is not exhaustive of all possible Canadian federal income tax considerations, and is not intended to be and
should not be construed as legal or tax advice to any particular U.S. Resident Holder. U.S. Resident Holders are urged to consult their
own tax advisers for advice with respect to their particular circumstances. The discussion below is qualified accordingly.</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0.25in">Generally, a U.S. Resident
Holder&#8217;s Common Shares will not constitute &#8220;taxable Canadian property&#8221; of such holder at a particular time at which
the Common Shares are listed on a &#8220;designated stock exchange&#8221; (which currently includes Nasdaq) unless both of the following
conditions are concurrently met:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.3in">(i)</TD><TD>at any time during the 60-month period that ends at the particular time, 25% or more of the issued shares of any class of the capital
stock of the Company were owned by or belonged to one or any combination of</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.3in">(A)</TD><TD>the U.S. Resident Holder,</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.3in">(B)</TD><TD>persons with whom the U.S. Resident Holder did not deal at arm&#8217;s length, and</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.3in">(C)</TD><TD>partnerships in which the U.S. Resident Holder or a person referred to in clause (B) holds a membership interest directly or indirectly
through one or more partnerships, and</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.3in">(ii)</TD><TD>at any time during the 60-month period that ends at the particular time, more than 50% of the fair market value of the Common Shares
was derived directly or indirectly from, one or any combination of, real or immovable property situated in Canada, &#8220;Canadian resource
properties&#8221; (as defined in the Canadian Tax Act), &#8220;timber resource properties&#8221; (as defined in the Canadian Tax Act),
or options in respect of, or interests in any of the foregoing, whether or not the property exists.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0.25in">Common Shares may also
be deemed to be &#8220;taxable Canadian property&#8221; in certain circumstances set out in the Canadian Tax Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in"><B>A U.S. Resident Holder
who disposes or is deemed to dispose of one or more Common Shares generally should not thereby incur any liability for Canadian federal
income tax in respect of any capital gain arising as a consequence of the disposition.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in"><B>A U.S. Resident Holder
to whom the Company pays or credits or is deemed to pay or credit a dividend on such holder&#8217;s Common Shares will be subject to Canadian
withholding tax, and the Company will be required to withhold the tax from the dividend and remit it to the CRA for the holder&#8217;s
account. The rate of withholding tax under the Canadian Tax Act is 25% of the gross amount of the dividend, but should generally be reduced
under the Convention to 15% (or, if the U.S. Resident Holder is a company which is the beneficial owner of at least 10% of the voting
stock of the Company, 5%) of the gross amount of the dividend. For this purpose, a company that is a resident of the United States for
purposes of the Canadian Tax Act and the Convention and is entitled to the benefits of the Convention shall be considered to own the voting
stock of the Company owned by an entity that is considered fiscally transparent under the laws of the United States and that is not a
resident of Canada, in proportion to such company&#8217;s ownership interest in that entity.</B></P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">Competition Act</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify; text-indent: 0.25in; margin-right: 0; margin-left: 0">Limitations
on the ability to acquire and hold Common Shares may be imposed by the Competition Act (Canada). This legislation permits the Commissioner
of Competition of Canada (the &#8220;Commissioner&#8221;) to review any acquisition of a significant interest in the Company. This legislation
grants the Commissioner jurisdiction to challenge such an acquisition before the Canadian Competition Tribunal if the Commissioner believes
that it would, or would be likely to, result in a substantial lessening or prevention of competition in any market in Canada.</P>

<P STYLE="font: italic bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">Investment Canada
Act</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify; text-indent: 0.25in; margin-right: 0; margin-left: 0">The Investment
Canada Act subjects an acquisition of control of a company by a non-Canadian to government review if the enterprise value of such company,
as calculated pursuant to the legislation, exceeds a threshold amount. A reviewable acquisition may not proceed unless the relevant minister
is satisfied that the investment is likely to result in a net benefit to Canada. Under the national-security-review regime in the Investment
Canada Act, review on a discretionary basis may also be undertaken by the federal government in respect of a broad range of investments
by a non-Canadian. No financial threshold applies to a national security review. The relevant test is whether such investment by a non-Canadian
could be &#8220;injurious to national security.&#8221;</P>

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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">NioCorp Assumed Warrants</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">In connection with the closing of the Transactions
(the &#8220;Closing&#8221;), pursuant to the Business Combination Agreement, the Company assumed the Warrant Agreement, dated as of March
17, 2021 (the &#8220;GXII Warrant Agreement&#8221;), by and between GXII and Continental Stock Transfer &amp; Trust Company (&#8220;CST&#8221;),
as warrant agent, and each share purchase warrant of GXII thereunder (the &#8220;GXII Warrants&#8221;) that was issued and outstanding
immediately prior to March 17, 2023 was converted into one Warrant (the &#8220;NioCorp Assumed Warrants&#8221;) pursuant to the assignment,
assumption and amendment agreement to the GXII Warrant Agreement, dated March 17, 2023 (the GXII Warrant Agreement, as so amended, the
&#8220;NioCorp Assumed Warrant Agreement&#8221;), among NioCorp, GXII, CST, as existing warrant agent, and Computershare Inc. and its
affiliate Computershare Trust Company, N.A., together as successor warrant agent (the &#8220;NioCorp Assumed Warrant Agent&#8221;). In
connection with the Closing, NioCorp issued (a) 9,999,959 public NioCorp Assumed Warrants in respect of the GXII Warrants that were publicly
traded prior to the Closing and (b) 5,666,667 NioCorp Assumed Warrants to GX Sponsor II LLC (the &#8220;Sponsor&#8221;) in respect of
the GXII Warrants that it held prior to the Closing, which NioCorp Assumed Warrants were subsequently distributed by the Sponsor to its
members in connection with the Closing.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">Both the public NioCorp Assumed Warrants and the NioCorp
Assumed Warrants issued to the Sponsor are subject to the terms of the NioCorp Assumed Warrant Agreement and are identical, with certain
exceptions applicable to the NioCorp Assumed Warrants issued to the Sponsor for so long as such NioCorp Assumed Warrants are held by the
Sponsor, its members, or their respective affiliates and other permitted transferees. In accordance with the NioCorp Assumed Warrant Agreement,
any NioCorp Assumed Warrants issued to the Sponsor that are held by someone other than the Sponsor, its members, or their respective affiliates
and other permitted transferees, are treated as public NioCorp Assumed Warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">Each NioCorp Assumed Warrant is exercisable on and
after April 16, 2023 until its expiration for 1.11829212 Common Shares at a price of $11.50 per 1.11829212 Common Shares (subject to adjustments
for stock splits, stock dividends, reorganizations, recapitalizations and the like). Under the terms of NioCorp Assumed Warrant Agreement,
for so long as the NioCorp Assumed Warrants issued to the Sponsor are held by the Sponsor, its members, or their respective affiliates
and other permitted transferees, such holders have the right to elect to exercise those NioCorp Assumed Warrants on a cashless basis.
For such NioCorp Assumed Warrants exercised on a cashless basis after the Closing, the holder will be entitled to pay the exercise price
for those NioCorp Assumed Warrants by surrendering all or portion of the cash and/or Common Shares (valued at their fair market value)
into which those NioCorp Assumed Warrants are exercisable as shall be elected by the holder. For this purpose, Common Shares so surrendered
will be deemed to have a &#8220;fair market value&#8221; equal to the average reported last sale price of the Common Shares for the 10
trading days ending on the third trading day prior to the date of exercise of the applicable NioCorp Assumed Warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The NioCorp Assumed Warrants will expire at 5:00 p.m.,
New York City time, on March 17, 2028 or earlier upon redemption or liquidation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The Company will not be obligated to deliver any
Common Shares pursuant to the exercise of a NioCorp Assumed Warrant and will have no obligation to settle such exercise unless a registration
statement under the Securities Act with respect to the Common Shares underlying the NioCorp Assumed Warrants is then effective and a
prospectus relating thereto is current, subject to the Company satisfying its obligations described below with respect to registration.
No NioCorp Assumed Warrant will be exercisable and the Company will not be obligated to issue Common Shares upon exercise of a NioCorp
Assumed Warrant unless Common Shares issuable upon such exercise have been registered, qualified or deemed to be exempt under the securities
laws of the state of residence of the registered holder of the NioCorp Assumed Warrants. In the event that the conditions in the two
immediately preceding sentences are not satisfied with respect to a NioCorp Assumed Warrant, the holder of such NioCorp Assumed Warrant
will not be entitled to exercise such NioCorp Assumed Warrant and such NioCorp Assumed Warrant may have no value and expire worthless.
In no event will the Company be required to net cash settle any NioCorp Assumed Warrant.</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;The NioCorp Assumed Warrants, and the underlying
Common Shares issuable upon the exercise thereof, were registered under the Securities Act pursuant to the Company&#8217;s registration
statement on Form S-4, originally filed on November 7, 2022, as subsequently amended, which was declared effective by the SEC on February
8, 2023. The ongoing registered offering of the Common Shares underlying the NioCorp Assumed Warrants is being conducted pursuant to the
Company&#8217;s registration statement on Form S-3, originally filed on April 14, 2023, as subsequently post-effectively amended to convert
such registration statement to Form S-1, which was declared effective on October 30, 2023.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The Company will have the right to call the public
NioCorp Assumed Warrants for redemption at any time following the Closing Date:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD><FONT STYLE="font-size: 10pt">in whole and not in part;</FONT></TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD><FONT STYLE="font-size: 10pt">at a price of $0.01 per NioCorp Assumed Warrant;</FONT></TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD><FONT STYLE="font-size: 10pt">upon not less than 30 days&#8217; prior written notice of redemption (the &#8220;30-day redemption period&#8221;)
to each public NioCorp Assumed Warrant holder;</FONT></TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD><FONT STYLE="font-size: 10pt">if, and only if, the reported last sale price of the Common Shares equals or exceeds approximately $16.10
per share (subject to certain adjustments) for any 20 trading days within a 30-trading day period commencing once the NioCorp Assumed
Warrants become exercisable and ending three business days before the Company sends the notice of redemption to the public NioCorp Assumed
Warrant holders; and</FONT></TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD><FONT STYLE="font-size: 10pt">if there is an effective registration statement covering the Common Shares issuable upon exercise of
the NioCorp Assumed Warrants, and a current prospectus relating thereto, available throughout the 30-day redemption period.</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The NioCorp Assumed Warrants issued to the Sponsor
are not redeemable by the Company for so long as such NioCorp Assumed Warrants are held by the Sponsor, its members, or their respective
affiliates or other permitted transferees. In addition, the Company may not exercise its redemption right if the issuance of Common Shares
upon exercise of the NioCorp Assumed Warrants is not exempt from registration or qualification under applicable state blue sky laws or
the Company is unable to effect such registration or qualification.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">If the Company calls the public NioCorp Assumed Warrants
for redemption as described above, the Company will have the option to require any holder that wishes to exercise its public NioCorp
Assumed Warrant to do so on a &#8220;cashless basis.&#8221; In determining whether to require all holders to exercise their public NioCorp
Assumed Warrants on a &#8220;cashless basis,&#8221; the Company will consider, among other factors, its cash position, the number of
NioCorp Assumed Warrants that are outstanding and the dilutive effect on the Company&#8217;s shareholders of issuing the maximum number
of Common Shares issuable upon the exercise of the NioCorp Assumed Warrants. If the Company takes advantage of this option, all holders
of public NioCorp Assumed Warrants would pay the exercise price by surrendering their NioCorp Assumed Warrants for that number of Common
Shares equal to the quotient obtained by dividing (x) the product of the number of Common Shares underlying the public NioCorp Assumed
Warrants, multiplied by the difference between the exercise price of the NioCorp Assumed Warrants and the &#8220;fair market value&#8221;
(defined below) by (y) the fair market value. The &#8220;fair market value&#8221; shall mean the average reported last sale price of
the Common Shares for the 10 trading days ending on the third trading day prior to the date on which the notice of redemption is sent
to the holders of public NioCorp Assumed Warrants. If the Company takes advantage of this option, the notice of redemption will contain
the information necessary to calculate the number of Common Shares to be received upon exercise of the NioCorp Assumed Warrants, including
the &#8220;fair market value&#8221; in such case. Requiring a cashless exercise in this manner will reduce the number of Common Shares
to be issued and thereby lessen the dilutive effect of a redemption of the public NioCorp Assumed Warrants. If the Company calls the
public NioCorp Assumed Warrants for redemption and does not take advantage of this option, the Sponsor, its members, and their respective
affiliates and other permitted transferees would still be entitled to exercise their NioCorp Assumed Warrants for cash or on a cashless
basis using the same formula described above that other NioCorp Assumed Warrant holders would have been required to use had all NioCorp
Assumed Warrant holders been required to exercise their NioCorp Assumed Warrants on a cashless basis, as described in more detail below.</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">A holder of a NioCorp Assumed Warrant may notify the
Company in writing in the event it elects to be subject to a requirement that such holder will not have the right to exercise such NioCorp
Assumed Warrant, to the extent that after giving effect to such exercise, such holder (together with such holder&#8217;s affiliates),
to the NioCorp Assumed Warrant Agent&#8217;s actual knowledge, would beneficially own in excess of 4.9% or 9.8% (or such other amount
as a holder may specify) of the Common Shares outstanding immediately after giving effect to such exercise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The NioCorp Assumed Warrants have certain anti-dilution
and adjustments rights upon certain events.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The NioCorp Assumed Warrants may be exercised upon
surrender of the certificate representing such NioCorp Assumed Warrants on or prior to the expiration date at the offices of the NioCorp
Assumed Warrant Agent, with the exercise form on the reverse side of such certificate completed and executed as indicated, accompanied
by full payment of the exercise price (or on a cashless basis, if applicable), by certified or official bank check payable to the order
of the NioCorp Assumed Warrant Agent or by wire transfer, for the number of NioCorp Assumed Warrants being exercised. The NioCorp Assumed
Warrant holders will not have the rights or privileges of holders of Common Shares or any attendant voting rights until they exercise
their NioCorp Assumed Warrants and receive Common Shares. After the issuance of Common Shares upon exercise of the NioCorp Assumed Warrants,
each holder will be entitled to one (1) vote for each Common Share held of record on all matters to be voted on by NioCorp shareholders.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">If, upon exercise of the NioCorp Assumed Warrants,
a holder would be entitled to receive a fractional interest in a share, the Company will, upon exercise, round down to the nearest whole
number of Common Shares to be issued to the NioCorp Assumed Warrant holder.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The NioCorp Assumed Warrants were issued in registered
form under the NioCorp Assumed Warrant Agreement. The NioCorp Assumed Warrant Agreement may be amended by the parties thereto without
the consent of any registered holder (i) for the purpose of curing any ambiguity, or curing, correcting or supplementing any mistake,
or adding or changing any other provisions with respect to matters or questions arising under NioCorp Assumed Warrant Agreement as the
parties may deem necessary or desirable and that the parties deem shall not adversely affect the interest of the registered holders of
the NioCorp Assumed Warrants, and (ii) to provide for the delivery of such kind and amount of Common Shares or other securities or property
(including cash) receivable upon a reclassification, reorganization, merger or consolidation, or upon a dissolution following any such
sale or transfer, that the holder of NioCorp Assumed Warrants would have received if such holder had exercised his, her or its NioCorp
Assumed Warrants immediately prior to such event. All other modifications or amendments, including any amendment to increase the warrant
price or shorten the exercise period, shall require the vote or written consent of the registered holders of a majority of the then outstanding
public NioCorp Assumed Warrants. Any amendment solely to the NioCorp Assumed Warrants issued to the Sponsor and that are held by the Sponsor,
its members, or their respective affiliates or other permitted transferees, shall require the vote or written consent of a majority of
the holders of the then outstanding NioCorp Assumed Warrants issued to the Sponsor.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">Convertible Debentures</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">On January 26, 2023, NioCorp entered into the Securities
Purchase Agreement (the &#8220;Yorkville Convertible Debt Financing Agreement&#8221;) with YA. Pursuant to the Yorkville Convertible Debt
Financing Agreement, YA advanced a total amount of $15,360,000 to NioCorp in consideration of the issuance by NioCorp to YA of $16,000,000
aggregate principal amount of convertible debentures (the &#8220;Convertible Debentures&#8221;) at the time of Closing (the &#8220;Debenture
Closing&#8221;). As of June 12, 2024, there was $550,000 aggregate principal amount of the Convertible Debentures outstanding.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">Each Convertible Debenture issued under the Yorkville
Convertible Debt Financing Agreement is an unsecured obligation of NioCorp, matures on September 17, 2024, which maturity may be extended
for one six-month period in certain circumstances at the option of NioCorp, and incurs a simple interest rate obligation of 5.0% per
annum (which will increase to 15.0% per annum upon the occurrence of an event of default). The outstanding principal amount of, accrued
and unpaid interest, if any, on, and premium, if any, on the Convertible Debentures must be paid by NioCorp in cash when the same becomes
due and payable under the terms of the Convertible Debentures at their stated maturity, upon their redemption or otherwise.</P>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">Subject to certain limitations contained within the
Yorkville Convertible Debt Financing Agreement and the Convertible Debentures, including those as described below, holders of the Convertible
Debentures will be entitled to convert the principal amount of, and accrued and unpaid interest, if any, on each Convertible Debenture,
in whole or in part, from time to time over their term, into a number of Common Shares equal to the quotient of the principal amount and
accrued and unpaid interest, if any, being converted divided by the Conversion Price. The &#8220;Conversion Price&#8221; means, as of
any Conversion Date (as defined below) or other date of determination, the greater of (i) 90% of the average of the daily U.S. dollar
volume-weighted average price of the Common Shares on the principal U.S. market for the Common Shares as reported by Bloomberg Financial
Markets during the five consecutive trading days immediately preceding the date on which the holder exercises its conversion right in
accordance with the requirements of the Yorkville Convertible Debt Financing Agreement (the &#8220;Conversion Date&#8221;) or other date
of determination, but not lower than the Floor Price (as defined below), and (ii) the five-day volume-weighted average price of the Common
Shares on the TSX (or on the principal U.S. market if the majority of the trading volume and value of the Common Shares occurred on Nasdaq
during the relevant period) for the five consecutive trading days immediately prior to the Conversion Date or other date of determination
less the maximum applicable discount allowed by the TSX. The &#8220;Floor Price&#8221; means a price of $2.1435 per share, which is equal
to the lesser of (a) 30% of the average of the daily volume-weighted average price of the Common Shares on the principal U.S. market for
the Common Shares as reported by Bloomberg Financial Markets during the five consecutive trading days immediately preceding the Debenture
Closing and (b) 30% of the average of the volume-weighted average price of the Common Shares on the principal U.S. market for the Common
Shares as reported by Bloomberg Financial Markets during the five consecutive trading days immediately following the Debenture Closing,
subject to certain adjustments to give effect to any stock dividend, stock split, reverse stock split, recapitalization or similar event.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The terms of the Convertible Debentures restrict the
number of Convertible Debentures that may be converted during each calendar month by YA at a Conversion Price below a fixed price equal
to approximately $8.9422 (i.e., the quotient of $10.00 divided by 1.11829212 (being the number of Common Shares that were exchanged for
each share of GXII at the Closing, after giving effect to the reverse stock split at a ratio of 10-for-1 effectuated by each of NioCorp
and ECRC on the date of Closing (the &#8220;Reverse Stock Split&#8221;))), subject to adjustment to give effect to any stock dividend,
stock split, reverse stock split, recapitalization or similar event. The Convertible Debentures are subject to customary anti-dilution
adjustments.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The terms of the Convertible Debentures restrict the
conversion of Convertible Debentures by YA if such a conversion would cause YA to exceed certain beneficial ownership thresholds in NioCorp
or such a conversion would cause the aggregate number of Common Shares issued pursuant to the Yorkville Convertible Debt Financing Agreement
to exceed the thresholds for issuance of Common Shares under the rules of Nasdaq, unless prior shareholder approval is obtained.</P>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">Financing Warrants</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">In conjunction with the Debenture Closing, NioCorp
issued to YA pursuant to the Yorkville Convertible Debt Financing Agreement financing warrants (the &#8220;Financing Warrants&#8221;)
to purchase 1,789,267 Common Shares, which is equal to the quotient of the principal amount of Convertible Debentures issued in such Debenture
Closing divided by the &#8220;Exercise Price,&#8221; which is equal to approximately $8.9422 (i.e., the quotient of $10.00 divided by
1.11829212 (being the number of Common Shares that were exchanged for each share of GXII at the Closing, after giving effect to the reverse
stock split at a ratio of 10-for-1 effectuated by each of NioCorp and ECRC on the Closing Date)), in each case, subject to adjustment
to give effect to any stock dividend, stock split, reverse stock split, recapitalization or similar event.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt; text-indent: 0pt">&#160;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The Financing Warrants are exercisable, in whole or
in part, but not in increments of less than $50,000 aggregate Exercise Price (unless the remaining aggregate Exercise Price is less than
$50,000), beginning on May 4, 2023 and may be exercised at any time prior to their expiration. Holders of the Financing Warrants may exercise
their Financing Warrants, at their election, by paying the Exercise Price in cash or, if at any time there is no effective registration
statement registering, or no current prospectus available for, the resale of the underlying Common Shares, on a cashless exercise basis.
On each of the first 12 monthly anniversaries of September 17, 2023, 1/12th of the Financing Warrants will expire.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The Financing Warrants have customary anti-dilution
adjustments to be determined in accordance with the requirements of the applicable stock exchanges.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The terms of the Financing Warrants restrict the exercise
of Financing Warrants by YA if such an exercise would cause YA to exceed certain beneficial ownership thresholds in NioCorp or such an
exercise would cause the aggregate number of Common Shares issued pursuant to the Yorkville Convertible Debt Financing Agreement to exceed
the thresholds for issuance of Common Shares under the rules of Nasdaq, unless prior shareholder approval is obtained.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">Notes</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">On April 12, 2024, the Company issued and sold to
the YA and Lind Global Fund II LP (&#8220;Lind&#8221;), in a private placement (the &#8220;April 2024 Private Placement&#8221;), $8.0
million aggregate principal amount of unsecured notes (the &#8220;Notes&#8221;), pursuant to a Securities Purchase Agreement, dated April
11, 2024 (the &#8220;Purchase Agreement&#8221;), between the Company and each of YA and Lind, as purchasers (in such capacity, the &#8220;Purchasers&#8221;).
Pursuant to the terms of the Notes, subject to certain exceptions as described below, on the first day of each calendar month, beginning
on June 1, 2024 (excluding August 2024) (a &#8220;Payment Date&#8221;), the Company will be required to repay a portion of the outstanding
balance of all of the Notes, on a pro-rata basis, in an amount equal to the sum of (i) $1.4 million of principal (or the outstanding principal
if less than such amount) in the aggregate among all of the outstanding Notes, plus (ii) 8.0% of the principal amount being paid (the
&#8220;Payment Premium&#8221;), and (iii) accrued and unpaid interest, if any, as of the Payment Date. The Company is required to make
payments on each Payment Date until the entire outstanding principal is repaid, but will not have an obligation to make a payment on a
Payment Date if the Equity Conditions (as defined below) are satisfied.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">Pursuant to the Purchase Agreement, the Purchasers
advanced an aggregate of $6.96 million to NioCorp in consideration of the issuance by NioCorp to the Purchasers of $8.0 million aggregate
principal amount of Notes and Warrants (the &#8220;April 2024 Warrants&#8221;) to purchase up to 615,385 Common Shares (the &#8220;April
2024 Warrant Shares&#8221;). Each April 2024 Warrant is exercisable for one Common Share for cash or, if at any time there is no effective
registration statement registering, or no current prospectus available for, the resale of the underlying Common Shares, on a cashless
basis at the option of the holder, at a price per Common Share of $3.25 (the &#8220;April 2024 Exercise Price&#8221;), subject to adjustment
for recapitalizations, stock splits, reverse stock splits or similar events, and expires April 12, 2027.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">Subject to certain limitations, including those as
described below, contained within the Notes, holders of the Notes will be entitled to convert the principal amount of, accrued and unpaid
interest, if any, and any Payment Premium that has become due and payable on each Note, from time to time over their term, into a number
of Common Shares equal to the quotient of the amount being converted divided by the fixed conversion price of $2.75 per Common Share (the
&#8220;Fixed Conversion Price&#8221;) up to a maximum of 3,141,817 Common Shares (together with the April 2024 Warrant Shares, the &#8220;Underlying
Shares&#8221;). The terms of the Notes restrict the conversion of the Notes by a holder if such a conversion or exercise would cause such
holder to exceed certain beneficial ownership thresholds in NioCorp.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The Notes are the unsecured obligations of NioCorp
and will mature on December 31, 2024. The Notes will incur a simple interest rate obligation of 0.0% per annum (which will increase to
18.0% per annum upon the occurrence of an event of default). The outstanding principal amount of, accrued and unpaid interest, if any,
on, and the Payment Premium, if any, on the Notes must be paid by NioCorp in cash when the same becomes due and payable under the terms
of the Notes at their stated maturity, upon their redemption or otherwise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">As mentioned above, NioCorp is required to make payments
on each Payment Date until the entire outstanding principal is repaid, but will not have an obligation to make a payment on a Payment
Date if the Equity Conditions are satisfied. The &#8220;Equity Conditions&#8221; means (i) on each of the five consecutive trading days
prior a Payment Date (the &#8220;Measuring Period&#8221;) a registration statement registering the resale by the Purchasers of the Underlying
Shares under the Securities Act (the &#8220;Underlying Shares Registration Statement&#8221;) is effective and available for the resale
by the Purchasers of all Underlying Shares, (ii) NioCorp has no knowledge of any fact that would cause the Underlying Shares Registration
Statement not to be effective and available for the resale of the Underlying Shares, (iii) on each day during the Measuring Period, the
Common Shares are designated for quotation on Nasdaq, or on such other market or exchange on which the Common Shares are then listed or
traded to the extent such other market or exchange is the principal U.S. trading market for the Common Shares (the &#8220;Principal U.S.
Market&#8221;), and have not been suspended from trading nor have delisting or suspension of trading been threatened or pending, (iv)
during the Measuring Period, an event of default has not occurred, (v) on each trading day during the Measuring Period, the daily U.S.
dollar volume-weighted average price for a Common Share on the Principal U.S. Market as reported by Bloomberg Financial Markets is greater
than 120% of the Fixed Conversion Price, (vi) on each trading day during the Measuring Period the average daily volume traded exceeded
$500,000, and (vii) there is no limitation on conversion under the terms of Notes. In addition, any Payment Date and the amount payable
to the holder of a Note on any such Payment Date may be modified from time to time upon mutual written consent of NioCorp and such holder.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">Pursuant to the terms of the Notes, to the extent
a holder is a party to Yorkville Equity Facility Financing Agreement, for so long as any amount remains outstanding under such holder&#8217;s
Note, the amount of cash received by the Company as payment from such holder in respect of an Advance (as defined in the Yorkville Equity
Facility Financing Agreement) is subject to a right of offset, exercisable in such holder&#8217;s sole discretion, against an equal amount
of principal, accrued and unpaid interest, if any, and other amounts that have become due and payable under the Note, not to exceed $1.512
million in any calendar month.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The Notes may also be redeemed at NioCorp&#8217;s
option at any time and from time to time over their term at a redemption price equal to the principal amount being redeemed, plus the
Payment Premium, plus accrued and unpaid interest, if any, as of the redemption date.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The Notes contain events of default customary for
instruments of their type (with customary grace periods, as applicable) and provide that, upon the occurrence of an event of default arising
from certain events of bankruptcy or insolvency with respect to NioCorp, all outstanding Notes will become due and payable immediately
without further action or notice. If any other type of event of default occurs and is continuing, then any holder may declare all of its
Notes to be due and payable immediately.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">Pursuant to a global guaranty agreement, dated as
of April 11, 2024, among ECRC and 0896800 B.C. Ltd. (together with ECRC, the &#8220;Guarantors&#8221;), the Guarantors guaranteed the
full, prompt and unconditional payment when due (whether at maturity, by acceleration or otherwise), and the performance of all liabilities,
agreements and other obligations of NioCorp to the Purchasers contained in the Notes and the Purchase Agreement, to the extent such liabilities,
agreements and obligations are payable in cash.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">April 2024 Warrants</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">On April 12, 2024, in connection with the closing
of the April 2024 Private Placement, the Company issued to the Purchasers, in proportion to the aggregate principal amount of Notes issued
to each Purchaser, April 2024 Warrants to purchase the April 2024 Warrant Shares, which is equal to 25% of the aggregate principal amount
of Notes issued to the Purchasers divided by the April 2024 Exercise Price, subject to any adjustment to give effect to any stock dividend,
stock split or recapitalization.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The terms of the April 2024 Warrants restrict the
exercise of the April 2024 Warrants by a holder if such an exercise would cause such holder to exceed certain beneficial ownership thresholds
in NioCorp.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The April 2024 Warrants will be exercisable, in
whole or in part, but not in increments of less than $50,000 aggregate April 2024 Exercise Price (unless the remaining aggregate
April 2024 Exercise Price is less than $50,000), at any time on or before April 12, 2027. Holders of the April 2024 Warrants may
exercise their April 2024 Warrants, at their election, by paying the April 2024 Exercise Price in cash or on a cashless exercise
basis, if at any time there is no effective registration statement or prospectus available for the resale of the underlying Common
Shares or an event of default under the Notes has occurred and is continuing.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The April 2024 Warrants are subject to adjustment
for any stock dividend or other distribution, stock split, reverse stock split or recapitalization</P>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt; text-indent: 0.25in"></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><FONT ID="a_Toc168935661"></FONT>
Description of Warrants<FONT ID="a_Toc86514287"></FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">General</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">The following description,
together with the additional information we may include in any applicable prospectus supplement, summarizes the material terms and provisions
of the Warrants that we may offer under this prospectus. While the terms we have summarized below will apply generally to any Warrants
that we may offer under this prospectus, we will describe the particular terms of any series of Warrants in more detail in the applicable
prospectus supplement. The terms of any Warrants offered under a prospectus supplement may differ from the terms described below.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">We will file as exhibits
to the registration statement of which this prospectus is a part, or will incorporate by reference from another report that we file with
the SEC, the form of Warrant agreement or Warrant indenture, which may include a form of Warrant certificate, that describes the terms
of the particular series of Warrants we are offering before the issuance of the related series of Warrants. The following summary of material
provisions of the Warrants and the Warrant agreements and the Warrant indentures are subject to, and qualified in their entirety by reference
to, all the provisions of the Warrant agreement or Warrant indenture, and Warrant certificate, applicable to a particular series of Warrants.
We urge you to read the applicable prospectus supplement related to the particular series of Warrants that we sell under this prospectus,
as well as the complete Warrant agreements, Warrant indentures and Warrant certificates that contain the terms of the Warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">We will describe in the
applicable prospectus supplement the terms relating to Warrants being offered including:</P>

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<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">if applicable, the number of Warrants issued with each Common Share being
issued; </FONT></TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">if applicable, the date on and after which the Warrants and the related
Common Shares will be separately transferable;</FONT></TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">the number of Common Shares purchasable upon exercise of one Warrant and
the price at which these Common Shares may be purchased upon such exercise;</FONT></TD></TR></TABLE>

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<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">any provisions for changes to or adjustments in the exercise price or number
of Common Shares issuable upon exercise of the Warrants;</FONT></TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 10pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">the dates on which the right to exercise the Warrants will commence and
expire;</FONT></TD></TR></TABLE>

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<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">the manner in which the Warrant agreements, Warrant indentures and Warrants
may be modified;</FONT></TD></TR></TABLE>

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<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">federal income tax consequences of holding or exercising the Warrants, if
material; and</FONT></TD></TR></TABLE>

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<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">any other specific terms, preferences, rights or limitations of or restrictions
on the Warrants.</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">Before exercising their
Warrants, holders of Warrants will not have any of the rights of holders of the Common Shares purchasable upon such exercise, including
the right to receive dividends, if any, or payments upon our liquidation, dissolution or winding up of our affairs or to exercise voting
rights, if any.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">Exercise of Warrants</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">Unless we otherwise specify
in the applicable prospectus supplement, each Warrant will entitle the holder to purchase one Common Share at the exercise price that
we describe in the applicable prospectus supplement. Unless we otherwise specify in the applicable prospectus supplement, holders of the
Warrants may exercise the Warrants at any time up to the specified time on the expiration date that we set forth in the applicable prospectus
supplement, and after the close of business on the expiration date, unexercised Warrants will become void.</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">Holders of the Warrants
may exercise the Warrants by delivering the Warrant certificate representing the Warrants to be exercised together with specified information,
and paying the required amount to the Warrant agent in immediately available funds, as provided in the applicable prospectus supplement.
We intend to set forth in any Warrant agreement or Warrant indenture and in the applicable prospectus supplement the information that
the holder of the Warrant will be required to deliver to the Warrant agent.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0pt 1in; text-align: justify; text-indent: 0.25in">Upon receipt of the required
payment and any Warrant certificate or other form required for exercise properly completed and duly executed at the corporate trust office
of the Warrant agent or any other office indicated in the applicable prospectus supplement, we will issue and deliver the Common Shares
purchasable upon such exercise. If fewer than all of the Warrants represented by the Warrant or Warrant certificate are exercised, then
we will issue a new Warrant or Warrant certificate for the remaining amount of Warrants. If we so indicate in the applicable prospectus
supplement, holders of the Warrants may surrender securities as all or part of the exercise price for Warrants.</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><FONT ID="a_Toc168935662"></FONT>
Description of Units</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">As specified in the applicable
prospectus supplement, we may issue units consisting of one or more of the following: Common Shares, Warrants or any combination of such
securities. The applicable prospectus supplement will describe:</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
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the units, including whether and under what circumstances the securities comprising the units may be traded separately; </FONT></TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">a description of the terms of any unit agreement governing the units; </FONT></TD></TR></TABLE>

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<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">a description of the provisions for the payment, settlement, transfer or
exchange of the units; and</FONT></TD></TR></TABLE>

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Plan of Distribution</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in"><FONT ID="a_Hlk168479238"></FONT>We
may sell the securities from time to time in one or more transactions:</P>

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<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">through one or more underwriters or dealers; </FONT></TD></TR></TABLE>

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<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">directly to purchasers, including our existing shareholders in a rights
offering; </FONT></TD></TR></TABLE>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">We may distribute the
securities from time to time in one or more transactions at:</P>

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<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0; margin-bottom: 12pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">market prices prevailing at the time of sale; </FONT></TD></TR></TABLE>

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<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&#183;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">negotiated prices. </FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">We will describe the method
of distribution of each series of securities in the applicable prospectus supplement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">We may determine the price
or other terms of the securities offered under this prospectus by use of an electronic auction. We will describe how any auction will
determine the price or any other terms, how potential investors may participate in the auction and the nature of the underwriters&#8217;
obligations in the related supplement to this prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">Underwriters, dealers
or agents may receive compensation in the form of discounts, concessions or commissions from us or our purchasers as their agents in connection
with the sale of the securities. These underwriters, dealers or agents may be considered to be underwriters under the Securities Act.
As a result, discounts, commissions or profits on resale received by underwriters, dealers or agents may be treated as underwriting discounts
and commissions. Each prospectus supplement will identify any underwriter, dealer or agent, and describe any compensation received by
them from us. We may grant underwriters who participate in the distribution of securities an option to purchase additional securities
to cover over-allotments, if any, in connection with the distribution.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">We may have agreements
with the underwriters, dealers and agents to indemnify them against specified civil liabilities, including liabilities under the Securities
Act. Underwriters, dealers and agents may engage in transactions with or perform services for us in the ordinary course of their businesses.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">To the extent required,
this prospectus may be amended and supplemented from time to time to describe a specific plan of distribution.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">Agents</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">We may designate agents
who agree to use their reasonable efforts to solicit purchases of our securities for the period of their appointment or to sell our securities
on a continuing basis.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">Underwriters</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">If we use underwriters
for a sale of securities, the underwriters will acquire the securities for their own account. The underwriters may resell the securities
in one or more transactions, including negotiated transactions, at a fixed public offering price or at varying prices determined at the
time of sale. The obligations of the underwriters to purchase the securities will be subject to the conditions set forth in the applicable
underwriting agreement. The underwriters will be obligated to purchase all the securities of the series offered if they purchase any
of the securities of that series. We may change from time to time any initial public offering price and any discounts or concessions
the underwriters allow or reallow or pay to dealers. We may use underwriters with whom we have a material relationship. We will describe
the nature of any such relationship in any prospectus supplement naming any such underwriter.</P>

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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 10pt 0pt; text-align: justify; text-indent: 0in">Direct Sales</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">We may also sell securities
directly to one or more purchasers without using underwriters or agents. Underwriters, dealers and agents that participate in the distribution
of the securities may be underwriters as defined in the Securities Act, and any discounts or commissions they receive from us and any
profit on their resale of the securities may be treated as underwriting discounts and commissions under the Securities Act. We will identify
in the applicable prospectus supplement any underwriters, dealers or agents and will describe their compensation.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">Trading Markets and
Listing of Securities</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">Unless otherwise specified
in the applicable prospectus supplement, each class or series of securities will be a new issue with no established trading market, other
than our Common Shares, which are listed on The Nasdaq Global Market. We may elect to list any other class or series of securities on
any exchange or market, but we are not obligated to do so. It is possible that one or more underwriters may make a market in a class or
series of securities, but the underwriters will not be obligated to do so and may discontinue any market making at any time without notice.
We cannot give any assurance as to the liquidity of the trading market for any of the securities.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">Stabilization Activities</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">Any underwriter may engage
in over-allotment, stabilizing transactions, short covering transactions and penalty bids in accordance with Regulation M under the Exchange
Act. Over-allotment involves sales in excess of the offering size, which create a short position. Stabilizing transactions permit bids
to purchase the underlying security so long as the stabilizing bids do not exceed a specified maximum. Short covering transactions involve
purchases of the securities in the open market after the distribution is completed to cover short positions. Penalty bids permit the underwriters
to reclaim a selling concession from a dealer when the securities originally sold by the dealer are purchased in a covering transaction
to cover short positions. Those activities may cause the price of the securities to be higher than it would otherwise be. If commenced,
the underwriters may discontinue any of these activities at any time.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-align: justify; text-indent: 0in">Delayed Delivery Contracts</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0pt 1in; text-align: justify; text-indent: 0.25in">If we so indicate in the
prospectus supplement, we may authorize agents, underwriters or dealers to solicit offers from certain types of institutions to purchase
securities from us at the public offering price under delayed delivery contracts. These contracts would provide for payment and delivery
on a specified date in the future. The contracts would be subject only to those conditions described in the prospectus supplement. The
prospectus supplement will describe the commission payable for solicitation of those contracts.</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">&#160;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><FONT ID="a_Toc168935664"></FONT><FONT ID="a_Toc86514289"></FONT>
Legal Matters</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0pt 1in; text-align: justify; text-indent: 0.25in">The validity of the securities
in respect of which this prospectus is being delivered will be passed upon for us by Blake, Cassels &amp; Graydon LLP, Vancouver, British
Columbia, Canada, relating to matters of British Columbia or Canadian law, and Jones Day, relating to matters of New York or U.S. federal
law. Additional legal matters may be passed upon for us or any underwriters, dealers or agents by counsel that we will name in the applicable
prospectus supplement.</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: justify; text-indent: 0.25in">&#160;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 10pt; text-transform: uppercase; text-align: center; text-indent: 0in"><FONT ID="a_Toc168935665"></FONT><FONT ID="a_Toc86514290"></FONT>
Experts</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The consolidated financial statements of NioCorp Developments
Ltd. as of June 30, 2023 and 2022 and for each of the three years in the period ended June 30, 2023, incorporated by reference in this
prospectus and in the registration statement have been so incorporated in reliance on the report of BDO USA, P.C., an independent registered
public accounting firm, given on the authority of said firm as experts in auditing and accounting. The report on the consolidated financial
statements contains an explanatory paragraph regarding  NioCorp Developments Ltd.&#8217;s ability to continue as a going concern.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">The financial statements of GX Acquisition Corp. II
as of December 31, 2022 and 2021 and for the years ended December 31, 2022 and 2021, have been audited by Marcum LLP, an independent registered
public accounting firm, as set forth in their report (which contains an explanatory paragraph relating to substantial doubt about the
ability of GX Acquisition Corp. II to continue as a going concern as described in Note 1 to GXII&#8217;s financial statements), and are
incorporated by reference in this prospectus and in the registration statement of which this prospectus is a part have been so incorporated
in reliance on such report given upon such firm as experts in auditing and accounting.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.25in">&#160;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-right: 0pt; margin-left: 0pt; text-indent: 0.25in">The technical report summary for the Elk Creek
Project prepared in accordance with subpart 1300 of Regulation S-K (the &#8220;S-K 1300 Elk Creek Technical Report Summary&#8221;), which
is incorporated by reference in this prospectus, and the information summarized or quoted from the S-K 1300 Elk Creek Technical Report
Summary included or incorporated by reference in this prospectus have been so included or incorporated by reference with the consent of
the following qualified persons, as such term is defined in Item 1300 of Regulation S-K, who prepared the S-K 1300 Elk Creek Technical
Report Summary and reviewed and approved such information summarized or quoted therefrom included or incorporated by reference in this
prospectus: Dahrouge Geological Consulting USA Ltd.; Understood Mineral Resources Ltd.; Optimize Group; Tetra Tech; Adrian Brown Consultants
Inc.; Metallurgy Concept Solutions; Magemi Mining Inc.; L3 Process Development; Olsson; A2GC; Scott Honan, M.Sc, SME-RM, NioCorp; Cementation;
Mahmood Khwaja, P.E., CDM Smith; and Wynand Marx, M.Eng, BBE Consulting. A matrix of the sections of the S-K 1300 Elk Creek Technical
Report Summary for which each qualified person is responsible is included in the S-K 1300 Elk Creek Technical Report Summary. Except for
Scott Honan, none of the qualified persons is affiliated with NioCorp. Mr. Honan is the Chief Operating Officer of NioCorp.<FONT ID="a_Toc86514291"></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt; text-indent: 0.25in">&#160;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&thinsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&thinsp;</B></P>

<!-- Field: Rule-Page --><DIV STYLE="margin-top: 1pt; margin-bottom: 1pt; width: 100%"><DIV STYLE="border-top: Black 3px double; font-size: 0.5pt">&thinsp;</DIV></DIV><!-- Field: /Rule-Page -->
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&thinsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&thinsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&thinsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&thinsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>&thinsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 24pt; text-align: center"><IMG SRC="n2574_img002.jpg" ALT=""></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt; text-align: center; text-indent: 0pt">6,628,846 Common Shares</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0pt 1in; text-align: center; text-indent: 0pt">1,063,462 Pre-Funded Warrants to Purchase up to 1,063,462 Common Shares<BR>
<BR>
</P>

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  <TD STYLE="white-space: nowrap; border-top: Black 1pt solid; border-bottom: Black 1pt solid; padding-top: 10pt; text-align: center; padding-bottom: 10pt; width: 1%"><B>&thinsp;&thinsp;PROSPECTUS SUPPLEMENT&thinsp;&thinsp;</B></TD>
  <TD STYLE="padding-top: 10pt; text-align: center; padding-bottom: 10pt">&thinsp;</TD></TR>
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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 1in; text-align: center">&thinsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 1in; text-align: center">Maxim Group LLC</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 1in; text-align: center">April 17, 2025</P>

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<p></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right"><B>Exhibit 107 </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 12pt 0 0">The prospectus supplement to which this exhibit is attached is a
final prospectus for the related offering. The maximum aggregate offering price of that offering is $23,000,000.40.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 12pt 0 0"></P>

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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
