Below a variable thickness of Pleistocence cover, averaging 60m thick is the Mannville Group consisting of shale mudstone, sandstone and coal, and/or the Athabasca Group sandstones and conglomerates. The Athabasca Group unconformably overlies the Archean gneisses of the basement rocks. Regolith at the unconformity can be strongly altered and stained. The Arrow deposit is hosted in numerous sub-vertical mineralized shear zones ~100m from surface extending to 920m, within units of semipelitic gneiss, mixed gabbro, granodiorite gneiss and semipelitic gneiss. (74F11-0042, www.nexgenenergy.ca) RK-14-21, now named AR-14-01 is the discovery hole. AR-14-30 drilled during the 2014 summer campaign returned "one of the best drill holes ever drilled in the Athabasca Basin history (909 on a total composite "GT" - grade x thickness metric)…multiple high-grade intercepts, include: -7.54% U3O8 over 63.50m -10.32% U3O8 over 46.00m -35.19% U3O8 over 7.00m -66.80% U3O8 over 0.50m (http://www.nexgenenergy.ca/s/arrow-rook-i.asp) Assessment file MAW00508 contains the 2013-14 drill program results with the initial discovery hole of the Arrow Zone, RK-14-21 (83/13, 6400418 N, 246803 E); 148 azimuth/-75 dip; 524.1 masl elevation; and follow up drill holes RK-14-24 to RK-14-30. The discovery hole targeted part of a coincident gravity low anomaly centred on a weak northeast trending conductor, and northeast trending aeromagnetic gradient. The remaining drill holes targeted the interpreted strike and dip extensions of uranium mineralization encountered within RK-14-21. Uranium mineralization as visible pitchblende was intersected in all eight drill holes (highlights reported below). Individual assays returned uranium grades ranging from 0.01% U3O8 upwards of 23.5% U3O8 over 0.4 m at 249.85 m depth in RK-14-27. Uranium mineralization is structurally controlled and tends to occur as: i) disseminations, ii) fracture fillings, iii) veins, and iv) part of shear structures and breccias in all basement assemblages. Alteration is not extensive and tends to occur as predominant clay-chlorite alteration favouring mafic-rich and graphitic gneiss assemblages and/or uranium-bearing structures. The better intersections include discovery hole RK-14-21: 0.37% U3O8/5.75 m from 517.25-523.0 m; hole RK-14-27: 1.04% U3O8/29.0 m from 235.0-264.0 m; and hole RK-14-30: 2.94% U3O8/6.2 m from 475.0-481.2 m; 2.51% U3O8/10.0 m from 508-518 m; 1.51% U3O8/4.9 m from 549.4-554.3 m; and 1.61% U3O8/8.4 m from 570-579 m. 2014 summer drill program at Arrow of 24 completed holes, AR-14-09 to -21A, -22 to -29A, and -30 to -33 (AF MAW00665). The best drill hole of the summer 2014 drilling season was AR-14-30. This hole was collared vertically (-90°) and intersected 92.0 m of 0.49% U3O8, 45.0 m of 2.45% U3O8, 4.5 m of 15.47% U3O8, 20.0 m of 10.17% U3O8, 63.5 m of 7.54% U3O8, 7.0 m of 0.08% U3O8 and 7.0 m of 0.21% U3O8. Uranium mineralization at Arrow occurs principally as pitchblende. Uranophane and coffinite have also been observed in drill core, but in relatively minor concentrations. The mineralization is structurally controlled and typically occurs in close proximity to graphitic, old mylonitic brittle reactivated shear zones. Pitchblende has been observed occurring as fracture linings, disseminations and as semi-massive to massive veins and replacement bodies. Mineralization is typically hosted in variably altered and locally graphitic semipelitic and pelitic gneiss. Hydrothermal alteration features present at the Arrow Zone provide distinct vectors towards mineralization. The most important alteration phase present is dravite clay. Typically, it occurs in centimetre to decimetre wide breccia vein style bodies beginning tens of metres from high grade uranium mineralization and increasing in size and frequency with increasing proximity to mineralization. There are disitinctive textural similarities between dravite breccia veins that occur at the Arrow Zone and those that occur at the McArthur River deposit. Typically, dravite clay breccia veins have holes of chloritic alteration that give the host a “wet-rock” appearance. Within zones of strong mineralization, sericite, illite and light green coloured sudoite (Mg-chlorite) are the dominant alteration phases present. Centimetre to decimetre-scale brick red coloured hematite alteration often occurs within or immediately adjacent to uranium mineralization. Mineralization discovered to date at the Arrow Zone shares several similar characteristics to the Eagle Point deposits located on the eastern edge of the Athabasca Basin. The Eagle Point deposits are associated with northeast trending reverse faults where graphitic horizons exhibit breccia, shear and crackle zones. Similar horizons occur at the Arrow Zone and are host to mineralization. Mineralization at Arrow and Eagle Point is concentrated at intersections with cross-cutting northwesterly and northerly sub-vertical wrench faults, respectively. Uranium mineralization present at both deposits occurs as lenses, pods and veins that are concordant and discordant to metamorphic stratigraphy. Summer 2015 delineation diamond drill program of 40 holes totaling 26,366 m (MAW01898). Highlights include the identification of a new high-grade subzone in the A2 shear with the best intersection in hole AR-15-62 of 10.00% U3O8/78.0 m; and the first significant mineralization in the A4 shear with intersections in offset hole AR-15-58c1 of 7.23% U3O8/5.0 m and 2.0% U3O8/19.0 m. Winter 2015 delineation diamond drill program of 24 holes totaling 12,494 m (MAW01938).

*No files with current data as noted on company website. 74F11-0042; MAW00284; MAW00508; MAW00665 74B-0007, 74F-0001, 74F-0005, 74F11-0001, 74F11-0011, 74F11-0012, 74F11-0013, 74F11-0014, 74F11-0016, 74F11-0042, 74F14-0004, 74K01-0005, MAW00124; MAW00284; MAW00649; MAW00665; MAW01898; MAW01938; MAW02144

www.nexgenenergy.ca

DATE    |     RESERVES LISTED   |  COMMENTS

NI 43-101-compliant Inferred Resource of 3.48 million tonnes (Mt) grading 2.63% U3O8 for a contained 201.9 million lbs (Mlb). U3O8 (NexGen Energy news release March 3, 2016). A 2017 update with NI 43-101-compliant Measured and Indicated Resources of 179.5 Mlb U3O8 from 1.18 Mt grading 6.88% U3O8 and Inferred Resources of 122.1 Mlb U3O8 from 4.25 Mt grading 1.30% U3O8.