NioCorp Strengthens Leadership Team with Appointment of General Counsel

David Hamm Brings More Than 15 Years of Corporate and Securities Law Experience

CENTENNIAL, CO / ACCESS Newswire / October 6, 2025 / NioCorp Developments Ltd. ("NioCorp" or the "Company") (NASDAQ:NB) is pleased to announce that David Hamm, an accomplished legal executive with extensive experience in corporate governance, securities regulation, and complex corporate transactions, has joined the Company as General Counsel.

Mr. Hamm brings more than 15 years of legal and business experience across the mining, construction materials, and telecommunications sectors. Most recently, he served as Senior Vice President, Deputy General Counsel, and Assistant Secretary at Summit Materials Inc., where he supported the company's board of directors and its committees and oversaw filings with the Securities and Exchange Commission, disclosure matters, mergers and acquisitions, and compliance programs. Prior to that, he was Associate General Counsel at Lumen Technologies Inc., advising on strategic transactions, corporate governance, and public-company disclosure. Earlier in his career, he practiced with several U.S. law firms, advising clients on mergers and acquisitions, finance, and governance matters. Mr. Hamm also served as an adjunct professor at the University of Colorado Law School and the University of Denver Sturm College of Law, where he taught securities regulation.

"David brings a wealth of public-company experience that will help NioCorp meet the highest standards of governance, disclosure, and commercial operations," said Mark A. Smith, NioCorp CEO and Executive Chairman. "His experience advising public companies on complex transactions and compliance matters adds important strength to our leadership team as we continue to advance toward completing our project financing and plan for future construction of the Elk Creek Project."

David earned his Master of Laws (LL.M.) in Securities and Financial Regulation, with distinction, from Georgetown University Law Center in 2021 and his Juris Doctor (J.D.) from the Paul M. Hebert Law Center at Louisiana State University in 2008.

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FOR MORE INFORMATION:

Jim Sims, Corporate Communications Officer, NioCorp Developments Ltd., [phone], [e-mail]

Alex Guthrie, Director, Investor Relations, NioCorp Developments Ltd., [phone],[e-mail]

@NioCorp $NB #Niobium #Scandium #rareearth #neodymium #dysprosium #terbium #ElkCreek

ABOUT NIOCORP

NioCorp is developing a critical minerals project in Southeast Nebraska that is expected to produce niobium, scandium, and titanium (the "Elk Creek Project"). The Company also is evaluating the potential to produce several rare earths from the Elk Creek Project. Niobium is used to produce specialty alloys as well as High Strength, Low Alloy steel, which is a lighter, stronger steel used in automotive, structural, and pipeline applications. Scandium is a specialty metal that can be combined with aluminum to make alloys with increased strength and improved corrosion resistance. Scandium is also a critical component of advanced solid oxide fuel cells. Titanium is used in various lightweight alloys and is a key component of pigments used in paper, paint and plastics and is also used for aerospace applications, armor, and medical implants. Magnetic rare earths, such as neodymium, praseodymium, terbium, and dysprosium are critical to the making of neodymium-iron-boron magnets, which are used across a wide variety of defense and civilian applications.