NioCorp Investor Presentation Deck

NioCorp Critical Mineral Security $2.8B Pre-Tax NPV 68% Averaged Annual EBITDA² Margin over Run of Mine³ Elk Creek Feasibility Study¹ Highlights (not including REE production) 29.2% Pre-Tax IRR $21.9B Gross Revenue over Mine Life $2.35B After-Tax NPV $10.9B After-Tax Cumulative Net Free Cash Flow² over Run of Mine³ 27.6% After-Tax IRR $1.14B Total Net Up- Front CAPEX $403M Averaged Annual EBIT A² over Run of Mine³ 38 Yrs. Mine Life ¹ Based on the 2022 NI 43-101 Elk Creek Technical Report. See "Mineral Reserves and Resources" in the Disclaimers & Technical Disclosures at the beginning of this presentation. 2 See "Financial Information; Non-GAAP Measures" in the Disclaimers & Technical Disclosures at the beginning of this presentation. 3 "Run of Mine" is defined as the period of time during which the mine is fully operational and excludes the periods of time when the mine is conducting its initial production ramp or is ramping down to closure. 34

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