Abaxx Technologies Inc. — Regulatory Filings 2021

Sep 20, 2021

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September 20, 2021

510 Burrard St, 3rd Floor Vancouver BC, V6C 3B9 www.computershare.com

To: All Canadian Securities Regulatory Authorities

Subject: NIOCORP DEVELOPMENTS LTD.

Dear Sir/Madam:

We advise of the following with respect to the upcoming Meeting of Security Holders for the subject Issuer:

Meeting Type : Annual General Meeting Record Date for Notice of Meeting : October 22, 2021 Record Date for Voting (if applicable) : October 22, 2021 Beneficial Ownership Determination Date : October 22, 2021 Meeting Date : December 02, 2021 Meeting Location (if available) : Centennial CO Issuer sending proxy related materials directly to NOBO: No Issuer paying for delivery to OBO: No

Notice and Access (NAA) Requirements:

NAA for Beneficial Holders Yes Beneficial Holders Stratification Criteria: Not Applicable NAA for Registered Holders Yes Registered Holders Stratification Criteria: Not Applicable

Voting Security Details:

Description CUSIP Number ISIN COMMON SHARES 654484104 CA6544841043 COMM US 1933 LEGEND 654484500 US6544845000

Sincerely,

Computershare

Agent for NIOCORP DEVELOPMENTS LTD.