NioCorp Purchases Final Land Parcels Necessary to Support a Construction Launch of the Elk Creek Critical Minerals Project

CENTENNIAL, CO / ACCESS Newswire / October 6, 2025 / NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq:NB), announced today that it has finalized the purchase of an additional 325.77 acres of land associated with its Elk Creek Critical Minerals Project (the "Elk Creek Project") in Nebraska. The acquisition provides NioCorp with ownership of all land that hosts the Elk Creek Project's Mineral Resource and Mineral Reserve and all acreage necessary to commence construction once project financing is obtained. This ownership position includes all necessary surface and mineral rights.

"This land purchase positions NioCorp to get out of the blocks quickly once we complete project financing and get the Elk Creek Project under construction and into commercial operations," said Mark A. Smith, NioCorp CEO and Executive Chairman. "The local landowners are a core component of this Project's success, and I cannot thank the people of southeast Nebraska enough for their continuing support and partnership in this historic, job-creating project."

Through its land ownership position along with options to purchase additional lands adjacent to that position, the Company has enough land to support planned commercial operations and potentially expand its current Mineral Resource and Reserve beyond the current 38 years of estimated mine life.

Qualified Persons: Scott Honan, M.Sc., SME-RM, COO of NioCorp Developments Ltd., a Qualified Person as defined by National Instrument 43-101, has reviewed and approved the technical information contained in this news release.

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FOR MORE INFORMATION:

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

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

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ABOUT NIOCORP

NioCorp is developing a critical minerals project in Southeast Nebraska (the "Elk Creek Project") that is expected to produce niobium, scandium, and titanium. 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.