NexGen Energy Ltd. (TSX-V: NXE) has released results from its winter 2015 drilling program from the company's 100-per-cent-owned Rook I property, Athabasca basin, Saskatchewan. Angled drill hole AR-15-39, located between angled drill holes AR-15-37 and -38 (see Figure 1 and February 17, 2015 news release), has discovered significant off-scale radioactivity (>10,000 to >61,000 cps) within the A3 shear (see Figures 1 and 2), and has also intersected substantial off-scale radioactivity (from >10,000 to 57,000 cps) within the A2 shear (see Figures 1 and 3) at the Arrow zone. Internal nomenclature for the Arrow zone has been developed, and is based on the three prominent northeast to southwest trending structures that are associated with mineralization at Arrow. The A1 (northernmost) to A3 (southernmost) mineralized shears are shown in Figure 1, and have been designated to assist with better describing the multiple high grade sections within the Arrow zone.
Highlights: Angled drill hole AR-15-39 intersected 89.15 m total composite mineralization including 16.75 m off-scale radioactivity (>10,000 to >61,000 cps) within a 436.5 m section (433.5 to 870.0 m), where the off-scale radioactivity is associated with dense accumulations of semi-massive to massive pitchblende mineralization;
The newly discovered high grade intersection within the A3 mineralized shear (see Figures 1 and 2) in AR-15-39 has returned 9.75 m off-scale radioactivity (>10,000 to >61,000 cps), and represents a 200 m down-dip extension from high grade uranium assay intervals in drill holes AR-14-08 and -13;
AR-15-39 reinforces the continuity of semi-massive to massive pitchblende mineralization within the A2 mineralized shear with 7.0 m off-scale radioactivity (>10,000 to 57,000 cps).
The Arrow zone is currently at an area of 515 x 215 m with the vertical extent of mineralization commencing from 100 to 817.5 m, and it remains open in all directions and at depth.
37 of 39 drill holes completed at Arrow to date have intersected uranium mineralization (as defined by uranium assay or the presence of >500 cps radioactivity using an RS-125 gamma spectrometer).
At Arrow, a total of 5,518.9 m has been reported on from the winter 2015 drill program. Drill hole locations are shown in Figure 1, and long sections illustrating the mineralized pierce points within the A2 and A3 shears at the Arrow zone are shown in Figures 2 and 3, respectively. Drill hole details and scintillometer (handheld RS-120) results are summarized in Table 1. Garrett Ainsworth, NexGen's Vice-President, Exploration and Development, commented "The importance of this new discovery of wide and concentrated high grade uranium mineralization from AR-15-39 within the A3 mineralized shear can't be overstated. Visible uranium mineralization (9.75 m of off-scale radioactivity) discovered in the A3 shear with AR-15-39 is analogous to the uranium mineralization that was discovered in the A2 shear with AR-14-15 (4.8 m off-scale radioactivity) during the summer 2014 drill program (see August 5th, 2015 news release). Vertical extent of mineralization has now been traced from as shallow as 100 m to depths of 820 m, which continues to show the impressive strength of the uranium mineralizing system that precipitated out into the Arrow zone." Leigh Curyer, Chief Executive Officer commented, "The similarities in the intensity of mineralization between AR-14-15 (A2 shear) and AR-15-39 (A3 shear) are clearly evident. AR-14-15 led to defining the vertical extent of the high grade zone in the A2 shear with AR-14-30 (composite grade thickness of 909) which is currently extended 81 meters to the southwest. Opening up the A3 shear to a similar sized envelope of high grade as A2, expands the total potential of Arrow exponentially in terms of size and grade from that previously understood. Arrow is quickly becoming a significant discovery on a world scale with relatively very few holes drilled."
Table 1: Arrow Zone Drill Hole Data
| Hole ID | Total Depth (m) | From (m) | To (m) | Width (m) | CPS Range |
| 987.00 | 106.45 | 433.50 | 434.00 | 0.50 | ≤500 - 1000 |
| 439.50 | 449.50 | 10.00 | ≤500 - 2100 | ||
| 609.00 | 612.50 | 3.50 | ≤500 - 3300 | ||
| 622.50 | 649.00 | 26.50 | ≤500 - 5700 | ||
| 682.50 | 683.00 | 1.50 | ≤500 - 2500 | ||
| 747.50 | 751.00 | 3.50 | ≤500 - 5000 | ||
| 754.50 | 755.00 | 0.50 | ≤500 - 500 | ||
| 761.00 | 762.00 | 1.00 | ≤500 - 1300 | ||
| 765.00 | 779.00 | 14.00 | ≤500 - 41000 | ||
| 788.50 | 790.50 | 2.00 | ≤500 - 31000 | ||
| 797.00 | 798.00 | 1.00 | ≤500 - 1500 |
Parameters:Maximum internal dilution 2.00 m downhole All depths and intervals are meters downhole "Anomalous" means >500 cps (counts per second) total count gamma readings by gamma scintillometer type RS-120 "Off-scale" means >10,000 cps (counts per second) total count gamma readings by gamma scintillometer type RS-120 Where "Min cps" is <500 cps, this refers to local low radiometric zones within the overall radioactive interval
Natural gamma radiation in drill core reported in this news release was measured in counts per second (cps) using a Radiation Solutions Inc. RS-120 gamma-ray scintillometer. The reader is cautioned that total count gamma readings may not be directly or uniformly related to uranium grades of the rock sample measured; they should be used only as a preliminary indication of the presence of radioactive minerals. All intersections are downhole. Core interval measurements and true thicknesses are yet to be determined.Split core samples will be taken systematically, and intervals will be submitted to SRC Geoanalytical Laboratories (an SCC ISO/IEC 17025: 2005 Accredited Facility) of Saskatoon for analysis. All samples sent to SRC will be 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 are analyzed for U3O8 by ICP-OES and select samples for gold by fire assay. Assay results will be released when received.ARROW ZONE DRILLINGAR-15-39:Hole AR-15-39 was drilled at an angled orientation (-70degree dip) to the southeast (140degree azimuth) designed to test the A2 shear between holes AR-15-37 (9.35 m of off-scale radioactivity; assays pending) and AR-15-38 (4.5 m of off-scale radioactivity; assays pending), and the A3 shear down-dip from high grade uranium assay intervals intersected in AR-14-08 and -13. The hole intersected bleached and locally strongly desilicified Athabasca Group sandstones between 91.0 m and the unconformity at 106.5 m. Basement lithologies consisted largely of semipelitic gneiss to granofel, and locally graphitic pelitic gneiss and mylonite (the A1 to A3 shears). The hole successfully intersected widespread anomalous radioactivity within the A2 and A3 shears that was associated with visible semi-massive to massive, veins, worm rock-style, chemical solution fronts, stringers, blebs, and flecks of pitchblende and coffinite mineralization with rare secondary uranium minerals. A total composite mineralization of 89.15 m including 16.75 m of off-scale radioactivity (>10,000 to >61,000 cps) was intersected within a 436.5 m section (433.5 to 870.0 m). The hole, which was terminated at 987.0 m, represents an interpreted 200 m down-dip step-out from AR-14-08 and -13 on the A3 high-grade mineralized shear.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 exploration professionals with a track record in the discovery of basement and unconformity-style uranium deposits in Canada.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, immediately adjacent to the northeast of the Fission/Alpha Patterson Lake South Discovery, and an option to earn a 70% interest in the Radio Project, immediately adjacent to Rio Tinto's Roughrider Deposit.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.
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