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NexGen Energy announces positive results from Arrow Project Studies

Mining News - Published on Fri, 15 Jun 2018

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NexGen Energy Ltd announced the positive results from Pre-Feasibility-stage technical studies including metallurgical, geotechnical, and hydrogeological assessments. These studies were conducted on the basement-hosted Arrow Deposit, located on the Company's 100% owned Rook I project in Saskatchewan's Athabasca Basin.


Metallurgical Study

The Bench-Scale Metallurgical Study has demonstrated high purity yellowcake product can be produced by using peroxide and MgO. The final product, produced yellowcake, meeting or surpassing industry standards.

High recovery rates confirmed.
Leaching test samples representing anticipated typical mill feed resulted in 97.6% of uranium was recovered.
Optimized solvent extraction resulted in 99.6% of uranium extracted.

Strength tests meet or exceed all requirements set forth in the original design for a potential Paste-Backfill to be used for underground stope stability.
Paste-Backfill samples composed of representative uranium tailings mixed with binder, underwent an initial 28-day Unconfined Compressive Strength test with results surpassing the targeted high-strength Backfill of 1.5 MPa outlined in the initial mine design in the Preliminary Economic Assessment.

Geotechnical Study

Conventional long-hole stoping mining method confirmed.
The geotechnical assessment supports the conventional long-hole stoping mining method including the use of longitudinal and transverse stopes, 30 m level spacing, and the nominal stope strike length of 15 m to 30 m. This represents an excellent stope stability range for underground mining in competent conditions.

Hydrogeological Study
Hydraulic conductivity consistent with that predicted in basement rocks.
The hydrogeological study measured hydraulic conductivity. Results were as predicted given mineralization is completely hosted in the crystalline basement rocks. Conductivity which measures the presence of water, decreases with depth and is expected to be lowest at depths associated with mine workings.

Development, Activities & Financial
Pre-feasibility staged technical studies including geotechnical work, hydrogeological work, and metallurgy continue in advance of the updated Mineral Resource Estimate and maiden Pre-Feasibility Study scheduled for the end of Q3 / early Q4 2018.
A summer drilling program is in the final stages of preparation and will begin imminently.
The Company has cash on hand of approximately ~CAD 145 million.

Mr Troy Boisjoli, Vice-President, Operations and Project Development, commented that "Results from the metallurgical study demonstrate high recovery of uranium during the leaching and optimized solvent extraction process. Furthermore, positive results from Paste-Backfill test work has confirmed proof of concept for potential application of an underground tailings management facility. In addition to responsible tailings management, mixing tailings with cement and depositing it back underground will facilitate ongoing and continued reclamation while in operation. Geotechnical results have confirmed the nature of the basement-hosted Arrow Deposit can support conventional long-hole stoping mining methods. The hydrogeological study demonstrates hydraulic conductivity is entirely consistent with that of basement-hosted deposits and is favourable for mine development. With every stage of development NexGen continues to confirm the robustness of the Arrow Project."

Mr Leigh Curyer, Chief Executive Officer, commented that "Development studies continue to emphasize the unique technical characteristics of the Arrow Project. These results quantify high recovery rates, non-detect deleterious metals and competency of the basement rocks. The maiden Pre-Feasibility Study which will incorporate an updated Mineral Resource Estimate is on schedule for release at end of Q3 or early Q4. In the interim, the summer 2018 drilling program will commence imminently which will continue to focus on determining the overall scale of Arrow and near-Arrow mineralization as well as further define site characterization for development."

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Posted By : Nanda Koijam on Fri, 15 Jun 2018
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