NioCorp Investor Presentation Deck

Niobium ThyssenKrupp Metallurgical Products² 50% of NioCorp's planned ferroniobium production for first 10 yrs.¹ Pricing set at 3.75% discount to Argus Metals index pricing for ferroniobium NioCorp Critical Mineral Security Offtake Agreements for Products NioCorp Intends to Produce¹ 75% of NioCorp's planned Ferroniobium production already contracted for the first 10 years of operation CMC Cometals³ 25% of NioCorp's planned ferroniobium production for first 10 yrs. ¹ Pricing set at 3.75% discount to Argus Metals index pricing for ferroniobium Scandium ~12% of NioCorp's planned production already contracted for the first 10 years of operation Traxys North America LLC4 Up to 12 tonnes per year of NioCorp's planned scandium production over 10 yrs.¹ Largest commercial sales agreement for Scandium known to have been executed. Rare Earths5 Stellantis, 3rd largest global automaker, and NioCorp executed a non-binding term sheet in July 2023 on the prospective sale of NioCorp's magnetic rare earth oxides. ¹ Subject to receipt of necessary project financing and commencement of operations at the Elk Creek Project. 2 Contract with Thyssen Metallurgical Products GmbH, dated November 10, 2014. 3 Contract with CMC Cometals, dated June 13, 2016, which was subsequently assigned to Traxys Cometals USA, LLC. 4 Contract with Traxys North America LLC, dated October 3, 2018. 5 NioCorp is currently conducting technical and economic analyses on the potential addition of magnetic rare earth oxides to its planned product suite. Final determination of possible rare earth production can be made only after work related to a mineral reserve update, additional engineering, updated project capital and operating cost estimates, and other required information is produced for publication in a new Feasibility Study. 27

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