NEWSROOM

CENTENNIAL, Colo. (October 28, 2022) – NioCorp Developments Ltd. (“NioCorp” or the “Company“) (TSX: NB; OTCQX: NIOBF) is pleased to announce that it will conduct its 2022 Annual General Meeting (“AGM”) at 10 a.m. Mountain time on Thursday, December 15, 2022, at 7000 S. Yosemite Street, Lower Level Conference Room, Centennial, Colorado, 80112.

Shareholders of record as of October 20, 2022, are able to vote their shares on the proposals to be considered at the AGM either by proxy in advance of the meeting or at the meeting.  Proxy or voting instructions must be received in each case no later than 10:00 a.m., Mountain time, on December 13, 2022, or no later than 48 hours before the AGM is reconvened following any adjournment or postponement. The Notice of Meeting, Management Information and Proxy Circular and form of proxy relating to the AGM and the Company’s 2022 Annual Report will be made public no later than October 28, 2022.

No action is expected to be taken by Company shareholders at the AGM regarding the proposed transactions contemplated by the recently announced Business Combination Agreement, dated September 25, 2022, among the Company, GX Acquisition Corp. II, and Big Red Merger Sub Ltd (collectively, the “Transaction”), or the approval of any elements of the proposed Transaction. A separate special meeting of Company shareholders is expected to be held to consider elements of the proposed Transaction.