NioCorp Investor Presentation Deck

Crawford No Scottsbluff +3424 Chadron Kimball Gordon. Rushville. Patridgeport Niobrará Alliance SAND Hyannis HILLS NioCorp Critical Mineral Security Middle Imperial Lake McConaughy Ogatata 80 Thedford Benkelman Elk Creek Project Location & Layout¹ The Elk Creek Project is centered within one 640-acre section of all private land. Valentine North North Platte McCook River Ainsworth Dunning Lou Loup South Loup Lexingt Broken Bow Ansley Kearney O'Neilon Burwell Holdrege Minden Alma Republican Lewis and Clark Lake Neligh Loup Hastings A Little Norfolk Grand Island R River Blue Superior Work Elk Creek Project Location Hartington South Sioux City Wayne Columbus West Point Wahoo Fairbury Blait Fremont Omaha Bellevue Lincoln Nebraska City Falls City • 105 km (65 miles) southeast of Lincoln, Nebraska (the state capital) • 129 km (80 miles) south of Omaha, Nebraska. • 3 miles west of Elk Creek, Nebraska and 6 miles south of Tecumseh, Nebraska. Tailings 2 Pond Tailings 3 Salt Cell 1 Resource Projection W PLO P Fill Substation doc Pyro Acid Hydromet HCI Waste e Ore Mineral Processing Dry Production TE Backfill Life Estates Bunker Pond Topsoil Tailings 1 Pond 2 a Vent Highway 62 Highway 50 Excellent location near highways, utilities, and supporting infrastructure. ¹ Based on the 2022 Elk Creek Technical Report. See "Mineral Reserves and Resources" in the Disclaimers & Technical Disclosures at the beginning of this presentation. 29

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