NioCorp updates Elk Creek Niobium Resource

Vancouver, British Columbia – September 22, 2014 – NioCorp Developments Ltd. (“NioCorp” or the “Company”) (TSX-V: NB, OTCQX: NIOBF, FSE: BR3) is pleased to announce an updated NI43-101 resource estimate for the Elk Creek niobium deposit.

Commencing in May, the Company initiated a three phase technical infill drilling program, with multiple goals of enhancing the classification of the resource; producing geotechnical and geochemical analysis of the deposit; provide material for the use in metallurgical studies including pilot plant; and to provide all other necessary information required to create and design a mine plan. Additional drilling to enhance the overall size of the deposit, where it remains open to the northwest, southeast, and at depth, will be carried out in the future.

The Company has completed the phase 1, five-hole drill program for a total of 5,011 m, with the phase 2, six- hole drill program now currently underway. Phase 3 will follow, if necessary. Utilizing historic and phase 1 drilling results, SRK Consulting (“SRK”) of Lakewood, Colorado and Cardiff, UK have completed an updated mineral resource estimate.

SRK’s Mineral Resource is based on a robust 3D model of grade trends within the carbonatite complex and is based on good QAQC results. Higher grades are associated with pyrochlore contained in magnetite bearing dolomitic carbonatite. The Indicated Mineral Resource is confined to a single coherent well drilled area containing continuous high grade features.

The estimate has been reported according to CIM Standards and will be supported by a NI43-101 independent report which will be published in due course.

The resource estimate for the Elk Creek deposit is summarized in Table 1 below:

(1) Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. All figures are rounded to reflect the relative accuracy of the estimate and have been used to derive sub-totals, totals and weighted averages. Such calculations inherently involve a degree of rounding and consequently introduce a margin of error. Where these occur, SRK does not consider them to be material. All composites have been capped where appropriate. The Concession is wholly owned by and exploration is operated by Niocorp Developments Ltd


Head Office – Suite 525, 999 West Hastings St. Vancouver, B.C., Canada V6C 2W2 Tel: 604-568-7365 Fax: 604-568-8270

Table 1 – SRK Mineral Resource Statement Effective Date 9th September 2014


Contained Nb2O5


Cut-off (Nb2O5 %)

Grade (Nb2O5 %)

(‘000 Tonnes)

(‘000 kg)











(2) The reporting standard adopted for the reporting of the MRE uses the terminology, definitions and guidelines given in the Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Standards on Mineral Resources and Mineral Reserves (December 2005) as required by NI 43-101.

(3) SRK assumes the Elk Creek deposit to be amenable to a variety of Underground Mining methods. In the absence of definitive pricing for Nb and established rates of metallurgical recovery, SRK has reported the Mineral Resource at a cut-off of 0.3% Nb2O5. The Company’s previous Mineral Resource dated April 2012 was calculated at a cut-off of 0.4% Nb2O5.

(4) SRK Completed a site inspection to the deposit by Mr Martin Pittuck, MSc., C.Eng, MIMMM , an appropriate “independent qualified person” as this term is defined in National Instrument 43-101.

Given the current early stage in the other technical disciplines and on-going metallurgical testwork the sensitivity in the Mineral Resource at a range of preliminary cut-off grades is presented in Table 2 from 0.3% Nb2O5 to 0.5% Nb2O5.

Table 2 – SRK Mineral Resource Sensitivity


Cut-off (Nb2O5 %) Tonnage (‘000 Tonnes)

Grade (Nb2O5 %) Contained Nb2O5 (‘000 kg)

INDICATED 0.50 19,100 0.74 142,000

INDICATED 0.40 22,600 0.70 157,600

INDICATED 0.30 28,200 0.63 177,000

INFERRED 0.50 63,700 0.74 469,600

INFERRED 0.40 87,000 0.66 573,300

INFERRED 0.30 132,800 0.55 733,700

Readers should note that this update only includes the results of phase 1 drilling operations. Work is currently on-going to improve the confidence in the current geological model through additional drilling and further validation of historical databases. Validation work is aimed to be completed with the completion of phase 2 drilling operations in the 4th quarter, at which point the company intends to deliver a follow up resource estimate which will include that data.

“Drill results have far exceeded our expectations on this deposit, and we are a very pleased to be able to deliver this resource update to shareholders,” stated Mark A. Smith, CEO of NioCorp. “We are also very impressed with the significant progress being achieved on the metallurgy program as we rapidly approach the pilot plant test stage. The information we now know, combined with the upcoming pilot plant results and the updated resource estimate before year end, will dovetail into the extensive engineering design work that SRK are diligently completing, in order to fully meet our overall objectives for this world-class project.”

The Company will file the complete NI43-101 compliant report on SEDAR and it will be available on the Company’s website within the prescribed timeline.


Head Office – Suite 525, 999 West Hastings St. Vancouver, B.C., Canada V6C 2W2 Tel: 604-568-7365 Fax: 604-568-8270

Qualified Persons:

Martin Pittuck, MSc., C.Eng, MIMMM of SRK Consulting (UK) Ltd., a Qualified Person as defined by National Instrument 43-101, is responsible for the Elk Creek resource estimation and has read and approved the technical information contained in this news release.

About the Company: NioCorp are developing the only primary niobium deposit known to be under development in the U.S., and the highest grade undeveloped niobium deposit in North America, located near Elk Creek, Nebraska. The Company has filed an NI43-101 compliant resource report, available on SEDAR, and is in the process of filing the updated NI43-101 compliant resource estimate reported in this press release. Niobium is mainly used in the form of Ferro-Niobium to produce HSLA (High Strength, Low Alloy) steel, to produce lighter, stronger steel for use in automotive, structural and pipeline industries. The U.S. imports 100% of its niobium needs.

For further information, contact the Company at (604) 568-7365 or at ON BEHALF OF THE BOARD
“Peter Dickie”

Peter Dickie
Director, President and Corporate Secretary

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

Certain statements contained in this press release may constitute forward-looking statements. Such forward-looking statements are based upon NioCorp’s reasonable expectations and business plan at the date hereof, which are subject to change depending on economic, political and competitive circumstances and contingencies. Readers are cautioned that such forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause a change in such assumptions and the actual outcomes and estimates to be materially different from those estimated or anticipated future results, achievements or position expressed or implied by those forward-looking statements. Risks, uncertainties and other factors that could cause NioCorp’s plans or prospects to change include changes in demand for and price of commodities (such as fuel and electricity) and currencies; changes or disruptions in the securities markets; legislative, political or economic developments; the need to obtain permits and comply with laws and regulations and other regulatory requirements; the possibility that actual results of work may differ from projections/expectations or may not realize the perceived potential of NioCorp’s projects; risks of accidents, equipment breakdowns and labour disputes or other unanticipated difficulties or interruptions; the possibility of cost overruns or unanticipated expenses in development programs; operating or technical difficulties in connection with exploration, mining or development activities; the speculative nature of mineral exploration and development, including the risks of diminishing quantities of grades of reserves and resources; and the risks involved in the exploration, development and mining business. NioCorp disclaims any intention or obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise.


Head Office – Suite 525, 999 West Hastings St. Vancouver, B.C., Canada V6C 2W2 Tel: 604-568-7365 Fax: 604-568-8270

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