NexGen Releases Project Development-Focused Summer 2018 Drilling Results
NexGen Releases Project Development-Focused Summer 2018 Drilling
Results
Vancouver, BC, November 22, 2018 – NexGen Energy Ltd. (“NexGen” or the “Company”) (TSX: NXE, NYSE MKT:
NXE) is pleased to report geotechnical and radioactivity results for twenty-nine holes comprising 20,482.31 m on
the Company’s 100% owned Rook I property, in the Athabasca Basin, Saskatchewan . The primary objective of
the program was the geotechnical characterization of areas within Arrow’s footwall, lateral development and
potential underground infrastructure locations of which results were incorporated into the Pre-Feasibility Study
(“PFS”) released on November 5 th, 2018 . The exp loration results of this release which encountered strong
mineralized intervals in key areas were not incorporated into the updated Mineral Resource Estimate and PFS
results, released on November 5, 2018.
Highlights:
Geotechnical Characterization of the A2 Sub-Zone
Two holes drilled to geotechnically characterize the rock mass within the A2 sub -zone, underwent dedicated
geotechnical logging and packer tests throughout the ore zone to obtain data and analysis of sub -surface
conditions within the mine plan . Both holes were collared at a steep inclination, then shallowed out to a dip of
approximately 57°.
• GAR-18-016 intersected 38.5 m of total composite mineralization including 10.7 m of total composite
off-scale radioactivity (>10,000 to >61,000 cps) within a 75 m section (552.0 to 627.0 m) and featured
1.5 m of continuous massive-to-semi massive pitchblende with minimum-greater-than-61,000 cps.
Geotechnical Characterization of the Footwall
Holes targeting the footwall successfully characterized the geotechnical and hydrogeological conditions of the
rock-mass proximal to the potential mine infrastructure and Underground Tailings Management Facility
(“UGTMF”). Additionally, drilling focused on the sterilization of uranium mineralization within areas that will
host project development infrastructure and were all geotechnically logged incorporating packer tests at regular
intervals.
• Holes drilled within the footwall of Arrow , in areas of envisioned underground mine infrastructure
intersected suitable rock-mass and hydraulic conductivity to facilitate underground development.
• Similarly, holes drilled within the proximity of the UGTMF positively indicated the area contains suitable
rock-mass and low hydraulic conductivity to facilitate underground development.
• Importantly, negligible alteration and structure were intersected in proximity of envisioned underground
mine infrastructure and UGTMF.
Shaft Pilot Hole Program
Three shaft pilot holes were successfully completed to a depth of between 650 m and 702 m. The vertically drilled
shaft holes were kept within a 3.0 m radius from surface through to their termination depths, intersected minimal
structure and showed low hydraulic conductivity throughout via packer testing at regular intervals.
• GAR-18-010 targeted shaft location option 1. The hole was successfully completed to a depth of 650 m,
intersecting minimal structure within proximity of targeted area in the footwall . A total of 6.0 m of
composite uranium mineralization was intersected (549.0 m to 550.0 m) with a maximum radioactivity
of 3,900 cps.
• GAR-18-013 targeted shaft location option 2. The hole was successfully completed to a depth of 650 m.
Preliminary results i ndicate the area contains suitable rock -mass and low hydraulic conductivity to
facilitate future shaft design.
o A Westbay Water Monitoring S ystem was installed after the hole was completed to allow for
continued sampling of the proposed shaft location.
• GAR-18-015 targeted shaft location option 3. The hole was successfully completed to a depth of 702 m,
intersecting minimal structure within designed underground mine infrastructure . Preliminary results
indicate the area contains suitable rock -mass and low hydraulic conductivity to facilitate a future shaft
design.
Exploration, A2 High-Grade Domain
Drilling focused on an under -explored area to the northeast boundary of the currently defined A2 high -grade
domain at variable elevations. Drilling resulted in the identification of mineralization between the A2 and A3
shears as well as demonstrating the continuity of high -grade mineralization beyond the currently defined A2
high-grade domains.
• AR-18-220c1 (located 50 m along strike to the northeast of AR-14-30 (10.32% U 3O8 over 46.0 m) )
intersected 55.5 m of total composite mineralization including 2.25 m of total composite off -scale
radioactivity (>10,000 to >61,000 cps) within a 109.5 m section (438.5 to 548.0 m) in the A2 shear. The
hole demonstrates the continuity of high-grade mineralization beyond the currently defined A2 high-
grade domains in the A2 shear.
Drill hole locations and schematics are shown in Figures 1 to 4. Drill hole descriptions can be found at
www.nexgenenergy.ca
Leigh Curyer, Chief Executive Officer, commented: “The successful completion of the geotechnical and
hydrogeological drilling was highly positive and reflected in the Arrow Project PFS released on November 5, 2018.
In addition, the exploration results at Arrow this last summer continue to provide strong upside with respect to
areas of potential future resource growth. These results have positively set the foundation for our largest
campaign to date at Arrow - a two staged 125,000 m drill program commencing mid-December 2018 through to
Q3 2019. The results of this program will then be incorporated into a Feasibility Study scheduled to be released
in H1 2020.”
Troy Boisjoli, Vice -President, Operations and Project Development, commented: “ The Summer 2018 drill
program demonstrated the highly competent geotechnical chartateristics of the Arrow depo sit. The team is
looking forward to the approaching 125,000 m drill program to further advance and optimize Arrow’s potential
mine development profile. Further, the high grade mineralization encountered northeast of the A2 High Grade
Domain is a great result providing additional areas to test in the future for potential resource growth.”
Development, Activities & Financial
• Expediting Arrow to Feasibility by initiating a 2-stage 125,000m (10 rig) high density drilling program
commencing in mid -December 2018 to focus on mine optimization plans based on Measured and
Indicated mineral resources.
• As of October 31, 2018, the Company had cash-on-hand of approximately $125 million which fully
funds NexGen for all programs throughout 2019.
Figure 1: Arrow Deposit Drilling Locations
Figure 2: Shaft Pilot Holes with Arrow Mine Design
Figure 3: A2 Geotechnical Characterization Holes
Figure 4: Footwall Geotechnical Characterization Holes
Table 1: Arrow Drill Hole Data
Drill Hole
Athabasca
Group -
Basement
Unconformity
Depth (m)
Handheld Scintillometer Results (RS-120)
Hole ID Azimuth Dip
Total
Depth
(m)
From (m) To (m) Width (m) CPS Range
AR-18-210c1 327 -70 876.50 115.00 606.50 607.00 0.50 <500 - 1710
AR-18-210c2 327 -70 957.50 N/A 584.50 585.00 0.50 <500 - 510
AR-18-210c3 327 -70 946.00 N/A No Anomalous Radioactivity
AR-18-211c1 327 -70 1128.50 N/A 865.50 866.00 0.50 <500 - 1300
869.50 870.00 0.50 <500 - 610
876.00 876.50 0.50 <500 - 570
961.50 962.00 0.50 <500 - 650
1089.00 1089.50 0.50 <500 - 650
AR-18-211c2 327 -70 1014.50 N/A 660.50 661.00 0.50 <500 - 680
AR-18-211c3 327 -70 1063.50 N/A No Anomalous Radioactivity
AR-18-212c1 325 -67 807.50 97.70 No Anomalous Radioactivity
AR-18-213c1 327 -65 765.50 98.85 No Anomalous Radioactivity
AR-18-214c1 327 -65 891.50 111.00 157.00 161.50 4.50 <500 - 4250
337.00 337.50 0.50 <500 - 970
AR-18-215c1 327 -70 990.50 N/A No Anomalous Radioactivity
AR-18-216c1 327 -65 483.50 107.40 No Anomalous Radioactivity
AR-18-217c1 327 -73.5 1233.50 122.50 910.00 910.50 0.50 <500 - 560
965.00 966.00 1.00 610 - 20000
969.50 971.00 1.50 <500 - 5200
977.50 978.50 1.00 <500 - 4600
AR-18-218c1 327 -65 827.00 97.80 No Anomalous Radioactivity
AR-18-219c1 327 -65 663.50 133.95 342.50 347.00 4.50 <500 - 1300
353.00 354.00 1.00 <500 - 3200
359.00 369.50 10.50 <500 - 4300
375.00 375.50 0.50 <500 - 650
387.00 416.00 29.00 <500 - 3300
430.00 433.00 3.00 <500 - 1275
442.00 445.00 3.00 <500 - 1550
447.50 470.50 23.00 <500 - 5350
572.00 573.50 1.50 <500 - 4200
578.50 579.50 1.00 <500 - 680
586.50 590.00 3.50 <500 - 61000
594.00 594.50 0.50 <500 - 570
602.00 605.00 3.00 <500 - 10500
611.50 612.00 0.50 1100 - 26700