VANCOUVER, June 15, 2015 /CNW/ - NexGen Energy Ltd. (TSX-V: NXE) ("NexGen" or the "Company") is pleased to report assay results for angled hole AR-15-44b from the successful winter 2015 program at the Arrow zone on our 100% owned Rook I property, Athabasca Basin, Saskatchewan.

AR-15-44b has delivered one of the finest uranium mineralized intersections ever drilled in the Athabasca Basin, and is the most continuously mineralized intersection of any hole drilled at the Arrow zone to date. Assays are presented in Table 1, a plan map of the Arrow zone is shown in Figure 1, long sections of the A2 and A3 high grade core zones are shown in Figure 2 and Figure 3, respectively.

Highlights:

• AR-15-44b showcases Arrow as a world-class discovery resulting in a total composite grade thickness ("GT") of 853.55;
• 56.5 m at 11.55% U3O8 (499.5 to 556.0 m) including 20.0 m at 20.68% U3O8 (499.5 to 519.5 m) and 1.0 m at 70.00% U3O8 (503.0 to 504.0 m);
• The most continually mineralized intersection at the Arrow zone to date with a GT of 654.78 ranking it as one of the top drill holes ever in uranium exploration;
• Located on the current south western edge of the high grade core zones of A2 and A3 shears (see Figure 2 and Figure 3). Summer drilling to step out further to the untested south west;
• The Arrow zone is currently 515m by 215m with the vertical extent of mineralization commencing from 100m and extending down to 920m, and is open in all directions (a 90 second 3D video of Arrow generated from Leapfrog is available for viewing on the Company website);
• Two of five rigs of the 25,000m $9 Million summer drill program commenced June 8, 2015;
• The Company is well financed with working capital of $30 Million.

Garrett Ainsworth, NexGen's Vice-President, Exploration and Development, commented "This world-class result from AR-15-44b will add substantial size to the rapidly developing Arrow zone. When increasing the internal dilution from 2.0 m to 4.5 m, this drill hole returns a total composite interval of 168.5 m at 5.00% U3O8 (455.5 to 624.0 m) representing an estimated true thickness of 43.6 m with only 1.2 m of estimated true thickness internal dilution. The summer 2015 drill program is now underway, and the technical team is excited to continue delineating and expanding the high grade Arrow zone, together with testing the high priority regional geophysical targets."

Leigh Curyer, Chief Executive Officer commented, "AR-15-44b represents a landmark hole and places Arrow into an exclusive class of uranium discoveries on the global stage. Intersecting extensive and high grade mineralization of this magnitude on the south western edge of the current known mineralized zone at Arrow has opened up the potential size and scale of the project to a whole new level. The success rate at Arrow is a result of the diligent work of the technical team led by Garrett Ainsworth and is a credit to all involved".

Composite parameters:

• Minimum thickness 0.5 m downhole
• Cutoff grade 0.01% U3O8 (weight %)
• Maximum internal dilution 2.00 m downhole
• U3O8 analyzed by ICP-OES at SRC laboratories, Saskatoon
• All depths and intervals are meters downhole

Split core samples were taken systematically, and intervals were submitted to SRC Geoanalytical Laboratories (an SCC ISO/IEC 17025: 2005 Accredited Facility) of Saskatoon for analysis. All samples were analyzed using ICP-MS for trace elements on the partial and total digestions, ICP-OES for major and minor elements on the total digestion, and fusion solution of boron by ICP-OES. Mineralized samples were analyzed for U3O8 by ICP-OES and gold by fire assay.

About NexGen

NexGen is a British Columbia corporation with a focus on the acquisition, exploration and development of Canadian uranium projects. NexGen has a highly experienced team of uranium industry professionals with a successful track record in the discovery of world class uranium deposits and in developing projects from discovery through to production.

NexGen owns a portfolio of highly prospective uranium exploration assets in the Athabasca Basin, Saskatchewan, Canada, including a 100% interest in Rook I, location of the Arrow Discovery in February 2014 and Bow Discovery in March 2015.

The technical information in this news release has been prepared in accordance with the Canadian regulatory requirements set out in National Instrument 43-101 and reviewed on behalf of NexGen Energy Ltd., by Garrett Ainsworth, P.Geo., Vice President – Exploration & Development, a qualified person.

Leigh Curyer,
Chief Executive Officer
NexGen Energy Ltd.
+1 604 428 4112
lcuryer@nexgenenergy.ca
www.nexgenenergy.ca

The TSXV has neither approved nor disapproved the contents of this press release. Neither the TSXV nor its Regulation Services Provider (as that term is defined in the policies of the TSXV) accepts responsibility for the adequacy or accuracy of this release.

Forward-Looking Information
This news release contains "forward-looking information" within the meaning of applicable Canadian securities laws. Generally, but not always, forward looking information is identifiable by the use of words such as "will" and planned" and similar expressions. Forward-looking information is based on the then current expectations, beliefs, assumptions, estimates and forecasts about the Company's business and the industry and markets in which it operates. Such information is not a guarantee of future performance and undue reliance should not be placed on forward-looking information. Assumptions and factors underlying the Company's expectations regarding forward-looking information contained herein include, among others: that general business and economic conditions will not change in a material adverse manner; that financing will be available if and when needed on reasonable terms; that the Company's current exploration activities can be achieved and that its other corporate activities will proceed as expected; that third party contractors, equipment and supplies and governmental and other approvals required to conduct the Company's planned exploration activities will be available on reasonable terms and in a timely manner.

Although the assumptions made by the Company in providing forward looking information are considered reasonable by management at the time the forward-looking information is given, there can be no assurance that such assumptions will prove to be accurate. Forward-looking information also involves known and unknown risks and uncertainties and other factors, which may cause actual events or results in future periods to differ materially from any projections of future events or results expressed or implied by such forward-looking information, including, among others: risks related to the availability of financing on commercially reasonable terms and the expected use of the proceeds; changes in the market; potential downturns in economic conditions; industry conditions; actual results of exploration activities being different than anticipated; changes in exploration programs based upon results of exploration; future prices of metal; availability of third party contractors; availability of equipment and supplies; failure of equipment to operate as anticipated; accidents, effects of weather and other natural phenomena and other risks associated with the mineral exploration industry; environmental risks; changes in laws and regulations; community relations; and delays in obtaining governmental or other approvals or financing. There can be no assurance that forward-looking information will prove to be accurate, as actual results and future events could differ materially from those anticipated, estimated or intended. NexGen undertakes no obligation to update or reissue forward-looking information as a result of new information or events except as required by applicable securities laws. The reader is cautioned not to place undue reliance on forward-looking information.

SOURCE NexGen Energy Ltd.

Image with caption: "Figure 1: Arrow Zone Drill Hole Locations (CNW Group/NexGen Energy Ltd.)". Image available at: http://photos.newswire.ca/images/download/20150615_C7529_PHOTO_EN_18057.jpg

Image with caption: "Figure 2: A2 Mineralized Shear Long Section (CNW Group/NexGen Energy Ltd.)". Image available at: http://photos.newswire.ca/images/download/20150615_C7529_PHOTO_EN_18058.jpg

Image with caption: "Figure 3: A3 Mineralized Shear Long Section (CNW Group/NexGen Energy Ltd.)". Image available at: http://photos.newswire.ca/images/download/20150615_C7529_PHOTO_EN_18059.jpg