Americas Gold and Silver Corporation press release

Final Winter Assays Confirm High Grade Uranium Mineralization in Step-Out Drilling at Arrow

2017-07-25

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Canada NewsWire

VANCOUVER, July 25, 2017

VANCOUVER, July 25, 2017/CNW/ - NexGen Energy Ltd. ("NexGen" or the "Company") (TSX:NXE,NYSEMKT:NXE)is pleased to report final assay results for the winter 2017 drilling program at our 100% owned, Rook I property, AthabascaBasin, Saskatchewan.

A3 Shear Expansion Drilling

Step-outhole AR-17-136c2 which intersected a new area of semi-massive to massive pitchblendemineralization in the A3 shearhas returned high grade assays.This high gradeuranium mineralization was intersected 40 m outside the current resource, and 70 m outside the current A3 High Grade Domain.

Step-out hole AR-17-136c2(170 m northeast and up-dip from AR-15-57c2) intersected 13.5 m at 9.58% U3O8(446.5 to 460.0 m) including 5.0 m at 23.49% U3O8(451.0 to 456.0 m).

Southwest Gap Area

First passdrill testing of the Southwest Gapintersected numerous lensesof high grade uranium mineralizationthat has connected the 180 m Southwest area with the Arrow Deposit. The Southwest Gap represents a material resource expansion opportunityas it was not included in the March 2017updated mineral resource estimate.

Step-out hole AR-17-131c3(80 m northeast and down-dip from AR-15-97) intersected 21.5 m at 2.51% U3O8(646.0 to 667.5 m) including 7.0 m at 4.68% U3O8(649.5 to 656.0 m). Step-out hole AR-17-131c4(120 m northeast and down-dip from AR-15-97) intersected 22.5 m at 1.67% U3O8(805.5 to 828.0 m). Step-out hole AR-17-143c1 (100 m northeast and up-dip from AR-15-97) intersected 15.5 m at 1.09% U3O8(663.0 to 678.5 m).

Southeast of Arrow Drilling

Highly anomalous uranium valueshave been intersected in the first two holesto test an Arrow-parallel structure 300 m southeast of the Arrow Deposit. Importantly, this mineralization is located on a completely separate conductor than the one that hosts the Arrow Deposit and it is the first time uranium mineralization has been encountered on this conductor. Both holes were targeting a large 3D resistivity anomaly with a similar size and intensity as the large 3D anomaly that is associated with Arrow. Hole RK-17-118w1, which intersected a narrow zone of visible pitchblende mineralization returned 0.25 m at 0.09% U3O8­. Follow-up drilling in this newly identified and highly prospective area has been prioritized and is currently underway.

Arrow, Activities & Financial

A seven-rig summer development program consisting of a minimum of 25,000 m of drilling and multiple pre-feasibility staged technical studies is underway. A maiden Preliminary Economic Assessment is imminently scheduled. The Company has cash on hand of approximately $200 million(see News Release dated July 21, 2017).

Longitudinal sections and maps showing drill hole locations are shown in Figures 1 to 4. Tables 1 and 2 show complete assay results for holes included herein.

Garrett Ainsworth, Vice-President, Exploration and Development, commented: "This last batch of drill hole assays from the winter 2017 program have confirmed previously released radioactivity results with strong grades over wide intervals, which will add to the existing Mineral Resource Estimate which was only based on drilling up to the end of 2016. The Arrow Deposit remains open in most directions with significant potential for both Inferred growth as well as rapid conversion to Indicated."

Leigh Curyer, Chief Executive Officer, commented: "These final winter 2017 assays confirm Arrow is still wide open for material expansion within and outside the current area of mineralization. The maiden PEA is due imminently which will not include any of the results from winter or summer 2017 drilling. With closing the CEF financing, NexGen is in a very strong position to optimize Arrow and deliver it as a leading resource project."

| Table 1: Arrow Deposit Assay Results | | | | | | | | | | | | | | | | | | | | Drill Hole | Athabasca Group - Basement Unconformity Depth (m) | SRC Geoanalytical Results | | | | | | | | Hole ID | Azimuth | Dip | Total Depth (m) | From (m) | To (m) | Interval (m) | U3O8 (wt%) | | | AR-17-122 | 147 | -70 | 381.50 | 96.10 | 224.00 | 227.00 | 3.00 | 0.01 | | | | | | | 235.50 | 253.00 | 17.50 | 0.10 | | | | | | | 240.50 | 246.00 | 5.50 | 0.25 | | AR-17-123c1 | 147 | -70 | 906.50 | 101.50 | 671.00 | 675.50 | 4.50 | 0.05 | | | | | | | 685.00 | 688.50 | 3.50 | 0.02 | | | | | | | 708.00 | 708.50 | 0.50 | 0.13 | | | | | | | 725.00 | 727.50 | 2.50 | 0.07 | | | | | | | 730.50 | 733.50 | 3.00 | 0.09 | | | | | | | 830.00 | 831.00 | 1.00 | 0.24 | | AR-17-123c2 | 147 | -70 | 864.50 | 101.50 | 650.00 | 658.00 | 8.00 | 0.10 | | | | | | | 668.50 | 670.00 | 1.50 | 1.91 | | | | | | | 675.00 | 676.00 | 1.00 | 0.25 | | | | | | | 680.50 | 684.00 | 3.50 | 0.21 | | | | | | | 687.00 | 688.00 | 1.00 | 0.41 | | | | | | | 707.00 | 720.50 | 13.50 | 0.35 | | | | | | | 725.50 | 742.00 | 16.50 | 0.32 | | | | | | | 753.50 | 754.00 | 0.50 | 0.13 | | | | | | | 760.50 | 765.50 | 5.00 | 0.02 | | | | | | | 778.00 | 779.50 | 1.50 | 0.02 | | | | | | | 784.50 | 791.00 | 6.50 | 0.16 | | | | | | | 824.50 | 825.00 | 0.50 | 0.01 | | | | | | | 833.00 | 835.00 | 2.00 | 0.06 | | | | | | | 837.50 | 838.00 | 0.50 | 0.01 | | | | | | | 843.50 | 844.50 | 1.00 | 0.06 | | | | | | | 847.50 | 852.00 | 4.50 | 0.05 | | AR-17-123c3 | 147 | -70 | 984.50 | 101.50 | 648.00 | 651.00 | 3.00 | 0.01 | | | | | | | 653.50 | 654.50 | 1.00 | 1.79 | | | | | | | 657.00 | 662.00 | 5.00 | 0.14 | | | | | | | 665.00 | 671.00 | 6.00 | 0.36 | | | | | | | 680.50 | 683.00 | 2.50 | 0.07 | | | | | | | 686.50 | 688.50 | 2.00 | 0.04 | | | | | | | 694.00 | 761.00 | 67.00 | 0.17 | | | | | | incl. | 699.00 | 714.00 | 15.00 | 0.38 | | | | | | | 783.00 | 784.00 | 1.00 | 0.09 | | | | | | | 794.00 | 797.50 | 3.50 | 0.02 | | | | | | | 803.50 | 804.00 | 0.50 | 0.03 | | | | | | | 816.00 | 818.00 | 2.00 | 0.04 | | | | | | | 836.00 | 838.50 | 2.50 | 0.03 | | | | | | | 848.00 | 848.50 | 0.50 | 0.07 | | | | | | | 881.50 | 884.50 | 3.00 | 0.09 | | | | | | | 944.00 | 945.50 | 1.50 | 0.02 | | AR-17-123c4 | 147 | -70 | 864.50 | 101.50 | 660.00 | 667.50 | 7.50 | 0.16 | | | | | | | 672.50 | 680.50 | 8.00 | 0.70 | | | | | | | 683.50 | 707.50 | 24.00 | 0.42 | | | | | | | 710.50 | 737.50 | 27.00 | 0.36 | | | | | | | 740.50 | 754.50 | 14.00 | 0.76 | | | | | | | 757.50 | 760.00 | 2.50 | 0.25 | | | | | | | 790.00 | 790.50 | 0.50 | 0.02 | | | | | | | 829.00 | 829.50 | 0.50 | 0.19 | | | | | | | 842.50 | 843.00 | 0.50 | 0.03 | | AR-17-124 | 147 | -70 | 411.00 | 93.40 | No Significant Intersections | | | | | AR-17-125 | 327 | -70 | 417.00 | N/A | 232.50 | 249.00 | 16.50 | 0.23 | | | | | | | 246.50 | 249.00 | 2.50 | 0.98 | | AR-17-128 | 327 | -70 | 357.00 | N/A | 194.00 | 200.00 | 6.00 | 0.43 | | | | | | incl. | 195.50 | 198.00 | 2.50 | 1.00 | | | | | | | 213.00 | 218.00 | 5.00 | 0.65 | | | | | | incl. | 215.00 | 217.50 | 2.50 | 1.27 | | AR-17-129c1 | 327 | -70 | 1074.50 | N/A | 670.00 | 671.00 | 1.00 | 1.65 | | | | | | | 763.50 | 773.00 | 9.50 | 0.39 | | | | | | | 779.00 | 783.00 | 4.00 | 0.88 | | | | | | | 791.00 | 794.50 | 3.50 | 0.98 | | | | | | | 801.50 | 808.50 | 7.00 | 1.15 | | | | | | | 801.50 | 802.00 | 0.50 | 13.10 | | | | | | | 812.00 | 814.50 | 2.50 | 0.21 | | | | | | | 819.50 | 823.50 | 4.00 | 0.10 | | | | | | | 831.50 | 833.50 | 2.00 | 0.04 | | | | | | | 838.50 | 840.00 | 1.50 | 0.01 | | | | | | | 845.00 | 847.50 | 2.50 | 0.02 | | | | | | | 851.00 | 853.50 | 2.50 | 0.02 | | | | | | | 894.50 | 896.00 | 1.50 | 2.18 | | | | | | | 899.00 | 905.50 | 6.50 | 1.37 | | | | | | incl. | 899.00 | 901.00 | 2.00 | 4.18 | | | | | | | 913.50 | 923.50 | 10.00 | 0.48 | | | | | | | 939.50 | 940.00 | 0.50 | 0.02 | | | | | | | 982.00 | 982.50 | 0.50 | 0.07 | | | | | | | 987.50 | 999.50 | 12.00 | 0.07 | | | | | | | 1005.50 | 1007.00 | 1.50 | 0.02 | | AR-17-129c2 | 327 | -70 | 1002.50 | N/A | 603.50 | 604.00 | 0.50 | 0.04 | | | | | | | 641.00 | 642.00 | 1.00 | 0.08 | | | | | | | 653.00 | 657.00 | 4.00 | 0.48 | | | | | | | 664.50 | 667.00 | 2.50 | 0.20 | | | | | | | 671.50 | 672.00 | 0.50 | 0.20 | | | | | | | 691.00 | 693.50 | 2.50 | 0.19 | | | | | | | 698.50 | 702.00 | 3.50 | 2.19 | | | | | | | 720.00 | 721.50 | 1.50 | 0.22 | | | | | | | 726.50 | 727.50 | 1.00 | 0.02 | | | | | | | 757.50 | 758.50 | 1.00 | 6.39 | | | | | | | 780.00 | 799.00 | 19.00 | 0.05 | | | | | | | 805.00 | 812.00 | 7.00 | 0.05 | | | | | | | 822.50 | 824.00 | 1.50 | 0.03 | | | | | | | 831.00 | 832.00 | 1.00 | 0.13 | | | | | | | 850.50 | 867.50 | 17.00 | 0.16 | | | | | | | 873.00 | 876.50 | 3.50 | 0.34 | | | | | | | 893.00 | 894.00 | 1.00 | 0.21 | | | | | | | 977.00 | 977.50 | 0.50 | 0.06 | | | | | | | 984.50 | 985.50 | 1.00 | 0.18 | | | | | | | 994.50 | 995.50 | 1.00 | 0.12 | | AR-17-129c3 | 327 | -70 | 981.50 | N/A | 693.50 | 694.00 | 0.50 | 0.02 | | | | | | | 796.50 | 797.00 | 0.50 | 0.05 | | | | | | | 807.50 | 808.00 | 0.50 | 0.19 | | | | | | | 811.00 | 812.00 | 1.00 | 1.15 | | | | | | | 815.50 | 817.50 | 2.00 | 0.81 | | | | | | | 825.00 | 838.00 | 13.00 | 0.65 | | | | | | | 841.50 | 844.00 | 2.50 | 0.04 | | | | | | | 848.00 | 848.50 | 0.50 | 0.02 | | | | | | | 852.00 | 854.50 | 2.50 | 0.07 | | | | | | | 862.00 | 864.00 | 2.00 | 0.02 | | | | | | | 872.50 | 873.00 | 0.50 | 0.07 | | | | | | | 875.50 | 880.50 | 5.00 | 0.10 | | | | | | | 897.50 | 898.00 | 0.50 | 0.12 | | | | | | | 917.50 | 918.50 | 1.00 | 0.15 | | | | | | | 929.00 | 941.50 | 12.50 | 1.08 | | | | | | | 952.50 | 953.00 | 0.50 | 0.16 | | AR-17-129c4 | 327 | -70 | 1023.50 | N/A | 611.50 | 613.00 | 1.50 | 0.48 | | | | | | | 651.00 | 651.50 | 0.50 | 2.84 | | | | | | | 654.50 | 655.00 | 0.50 | 0.98 | | | | | | | 689.00 | 690.00 | 1.00 | 2.26 | | | | | | | 742.00 | 744.00 | 2.00 | 0.19 | | | | | | | 766.00 | 768.00 | 2.00 | 1.86 | | | | | | | 775.50 | 776.00 | 0.50 | 0.01 | | | | | | | 781.00 | 787.00 | 6.00 | 0.04 | | | | | | | 798.50 | 813.50 | 15.00 | 0.07 | | | | | | | 826.00 | 827.50 | 1.50 | 0.03 | | | | | | | 831.00 | 834.50 | 3.50 | 0.02 | | | | | | | 839.00 | 839.50 | 0.50 | 0.04 | | | | | | | 846.00 | 847.50 | 1.50 | 0.03 | | | | | | | 851.50 | 853.00 | 1.50 | 0.03 | | | | | | | 879.50 | 880.00 | 0.50 | 0.02 | | | | | | | 884.00 | 887.00 | 3.00 | 0.02 | | | | | | | 892.00 | 894.00 | 2.00 | 0.03 | | | | | | | 914.50 | 916.50 | 2.00 | 0.14 | | | | | | | 932.00 | 932.50 | 0.50 | 0.07 | | | | | | | 952.00 | 952.50 | 0.50 | 0.17 | | | | | | | 984.00 | 985.00 | 1.00 | 0.30 | | AR-17-130 | 327 | -70 | 321.00 | N/A | 181.50 | 183.00 | 1.50 | 1.03 | | AR-17-131c1 | 147 | -70 | 857.50 | 100.50 | 659.50 | 660.00 | 0.50 | 4.81 | | | | | | | 677.00 | 677.50 | 0.50 | 0.03 | | | | | | | 785.00 | 785.50 | 0.50 | 0.15 | | AR-17-131c2 | 147 | -70 | 963.50 | 100.50 | 562.50 | 563.00 | 0.50 | 0.01 | | | | | | | 661.50 | 662.00 | 0.50 | 0.02 | | | | | | | 671.00 | 674.50 | 3.50 | 0.04 | | | | | | | 685.50 | 687.00 | 1.50 | 0.04 | | | | | | | 718.00 | 718.50 | 0.50 | 0.03 | | | | | | | 749.00 | 749.50 | 0.50 | 0.18 | | | | | | | 752.00 | 754.00 | 2.00 | 0.28 | | | | | | | 759.50 | 760.50 | 1.00 | 0.14 | | | | | | | 765.50 | 769.00 | 3.50 | 0.40 | | | | | | | 771.50 | 775.50 | 4.00 | 0.03 | | | | | | | 788.50 | 793.50 | 5.00 | 0.01 | | | | | | | 821.50 | 822.00 | 0.50 | 0.06 | | | | | | | 828.50 | 829.00 | 0.50 | 0.46 | | | | | | | 857.00 | 858.00 | 1.00 | 0.15 | | | | | | | 869.50 | 870.50 | 1.00 | 0.36 | | | | | | | 927.00 | 927.50 | 0.50 | 0.02 | | AR-17-131c3 | 147 | -70 | 1029.50 | 100.50 | 646.00 | 667.50 | 21.50 | 2.51 | | | | | | incl. | 649.50 | 656.50 | 7.00 | 4.68 | | | | | | | 670.50 | 680.50 | 10.00 | 0.23 | | | | | | | 711.50 | 712.00 | 0.50 | 0.02 | | | | | | | 724.50 | 725.50 | 1.00 | 0.04 | | | | | | | 763.50 | 768.50 | 5.00 | 0.07 | | | | | | | 772.50 | 774.50 | 2.00 | 0.05 | | | | | | | 777.50 | 785.50 | 8.00 | 0.04 | | | | | | | 803.50 | 809.50 | 6.00 | 0.09 | | | | | | | 816.50 | 823.00 | 6.50 | 0.05 | | | | | | | 844.00 | 844.50 | 0.50 | 0.02 | | | | | | | 865.00 | 865.50 | 0.50 | 0.02 | | | | | | | 881.00 | 881.50 | 0.50 | 0.05 | | | | | | | 892.50 | 893.00 | 0.50 | 0.02 | | | | | | | 897.00 | 898.50 | 1.50 | 0.02 | | | | | | | 908.00 | 923.50 | 15.50 | 0.04 | | | | | | | 933.50 | 943.00 | 9.50 | 0.03 | | | | | | | 946.50 | 947.50 | 1.00 | 0.02 | | | | | | | 952.00 | 952.50 | 0.50 | 0.08 | | | | | | | 959.50 | 961.00 | 1.50 | 0.02 | | | | | | | 976.00 | 977.00 | 1.00 | 0.03 | | | | | | | 982.50 | 984.00 | 1.50 | 0.02 | | AR-17-131c4 | 147 | -70 | 1044.50 | 100.50 | 647.00 | 667.50 | 20.50 | 0.17 | | | | | | | 670.50 | 684.00 | 13.50 | 0.11 | | | | | | | 689.00 | 689.50 | 0.50 | 0.11 | | | | | | | 698.50 | 699.00 | 0.50 | 0.01 | | | | | | | 736.00 | 750.00 | 14.00 | 0.14 | | | | | | | 753.00 | 753.50 | 0.50 | 0.02 | | | | | | | 768.00 | 771.50 | 3.50 | 0.08 | | | | | | | 784.50 | 786.50 | 2.00 | 0.18 | | | | | | | 805.50 | 828.00 | 22.50 | 1.67 | | | | | | | 833.00 | 833.50 | 0.50 | 0.15 | | | | | | | 839.00 | 839.50 | 0.50 | 0.08 | | | | | | | 856.50 | 857.00 | 0.50 | 0.06 | | | | | | | 876.50 | 877.00 | 0.50 | 0.07 | | | | | | | 942.50 | 945.00 | 2.50 | 0.06 | | | | | | | 989.00 | 990.00 | 1.00 | 0.04 | | AR-17-132 | 327 | -70 | 232.00 | N/A | No Significant Intersections | | | | | AR-17-134 | 327 | -70 | 401.00 | 102.50 | 232.00 | 239.00 | 7.00 | 0.15 | | AR-17-135 | 327 | -70 | 285.00 | 102.40 | No Significant Intersections | | | | | AR-17-136c1 | 327 | -70 | 567.00 | 128.40 | 432.50 | 435.50 | 3.00 | 0.04 | | | | | | | 441.50 | 444.00 | 2.50 | 0.39 | | | | | | | 450.50 | 451.50 | 1.00 | 0.31 | | | | | | | 475.50 | 476.50 | 1.00 | 0.91 | | | | | | | 485.50 | 498.50 | 13.00 | 0.29 | | AR-17-136c2 | 327 | -70 | 849.00 | 128.40 | 399.50 | 410.00 | 10.50 | 0.08 | | | | | | | 414.00 | 416.00 | 2.00 | 0.23 | | | | | | | 429.50 | 432.50 | 3.00 | 0.10 | | | | | | | 436.50 | 441.00 | 4.50 | 1.07 | | | | | | | 446.50 | 460.00 | 13.50 | 9.58 | | | | | | incl. | 451.00 | 456.00 | 5.00 | 23.49 | | | | | | | 539.50 | 551.00 | 11.50 | 0.32 | | | | | | | 554.00 | 554.50 | 0.50 | 0.07 | | | | | | | 614.50 | 615.00 | 0.50 | 0.07 | | | | | | | 752.00 | 756.00 | 4.00 | 0.53 | | | | | | | 767.00 | 768.50 | 1.50 | 0.07 | | | | | | | 803.50 | 804.00 | 0.50 | 0.05 | | | | | | | 819.50 | 820.00 | 0.50 | 0.01 | | AR-17-137 | 327 | -70 | 366.00 | N/A | No Significant Intersections | | | | | AR-17-139 | 327 | -70 | 321.00 | N/A | No Significant Intersections | | | | | AR-17-140 | 327 | -70 | 477.00 | 108.60 | 260.00 | 263.50 | 3.50 | 0.04 | | AR-17-141 | 327 | -70 | 330.00 | N/A | No Significant Intersections | | | | | AR-17-142 | 327 | -70 | 348.00 | N/A | No Significant Intersections | | | | | AR-17-143c1 | 147 | -70 | 852.50 | 104.90 | 620.00 | 621.00 | 1.00 | 0.12 | | | | | | | 629.00 | 631.50 | 2.50 | 0.02 | | | | | | | 634.00 | 634.50 | 0.50 | 0.06 | | | | | | | 663.00 | 678.50 | 15.50 | 1.09 | | | | | | | 681.50 | 682.50 | 1.00 | 3.52 | | | | | | | 686.00 | 686.50 | 0.50 | 1.42 | | | | | | | 703.50 | 706.00 | 2.50 | 0.26 | | AR-17-144c1 | 327 | -70 | 801.00 | 112.90 | 460.00 | 461.00 | 1.00 | 0.04 | | | | | | | 497.50 | 503.00 | 5.50 | 0.03 | | | | | | | 508.00 | 509.00 | 1.00 | 0.02 | | | | | | | 512.00 | 514.50 | 2.50 | 0.06 | | | | | | | 531.50 | 534.00 | 2.50 | 0.17 | | | | | | | 537.00 | 539.00 | 2.00 | 0.34 | | | | | | | 544.00 | 558.00 | 14.00 | 1.15 | | | | | | | 563.00 | 564.00 | 1.00 | 0.02 | | | | | | | 578.00 | 602.00 | 24.00 | 0.69 | | | | | | | 614.50 | 617.00 | 2.50 | 0.11 | | AR-17-144c2 | 327 | -70 | 723.50 | 112.90 | 468.50 | 472.50 | 4.00 | 0.04 | | | | | | | 492.50 | 522.50 | 30.00 | 0.19 | | | | | | | 532.50 | 537.00 | 4.50 | 0.94 | | | | | | | 541.00 | 542.50 | 1.50 | 0.17 | | | | | | | 605.50 | 606.00 | 0.50 | 0.20 | | | | | | | 625.50 | 626.50 | 1.00 | 0.20 | | | | | | | 632.50 | 633.50 | 1.00 | 0.12 | | | | | | | 639.00 | 641.50 | 2.50 | 0.07 | | | | | | | 644.50 | 645.50 | 1.00 | 0.12 | | | | | | | 650.00 | 655.50 | 5.50 | 0.48 | | AR-17-145 | 327 | -70 | 315.00 | N/A | No Significant Intersections | | | |

Parameters:

Maximum internal dilution 2.00 m downhole Minimum thickness 0.5 m downhole Cutoff grade 0.01% U3O8 U3O8 analyzed by ICP-OES at SRC Laboratories, Saskatoon, Saskatchewan All depths and intervals are meters downhole, true thicknesses are yet to be determined. Resource modelling in conjunction with an updated mineral resource estimate is required before true thicknesses can be estimated.

Table 2: Exploration Hole Assay Results

| Drill Hole | Athabasca Group - Basement Unconformity Depth (m) | SRC Geoanalytical Results | | | | | | | | Hole ID | Azimuth | Dip | Total Depth (m) | From (m) | To (m) | Interval (m) | U3O8 (wt%) | | | RK-17-114 | 140 | -70 | 708.00 | 121.00 | No Significant Intersections | | | | | RK-17-115 | 327 | -70 | 817.00 | 107.00 | No Significant Intersections | | | | | RK-17-116

RK-17-117 | 327 | -70 | 810.50 | 113.80 | No Significant Intersections | | | | | 320 | -70 | 801.50 | N/A | No Significant Intersections | | | | | | RK-17-117w1 | 320 | -70 | 776.50 | N/A | No Significant Intersections | | | | | RK-17-118 | 327 | -70 | 1074.50 | N/A | 375.50 | 376.00 | 0.50 | 0.01 | | 437.00 | 437.50 | 0.50 | 0.01 | | | | | | | 512.50 | 513.00 | 0.50 | 0.01 | | | | | | | RK-17-118w1 | 327 | -70 | 855.50 | N/A | 412.50 | 413.00 | 0.50 | 0.01 | | 490.75 | 491.00 | 0.25 | 0.09 | | | | | | | RK-17-119 | 147 | -68 | 933.50 | N/A | No Significant Intersections | | | |

Parameters:

Maximum internal dilution 2.00 m downhole Minimum thickness 0.25 m downhole Cutoff grade 0.01% U3O8 U3O8 analyzed by ICP-OES at SRC Laboratories, Saskatoon, Saskatchewan All depths and intervals are meters downhole, true thicknesses are yet to be determined. Resource modelling in conjunction with an updated mineral resource estimate is required before true thicknesses can be estimated.

About NexGen

NexGen is a British Columbiacorporation 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 uranium deposits and in developing projects through discovery to production.

NexGen owns a portfolio of prospective uranium exploration assets in the AthabascaBasin, Saskatchewan, Canada, including a 100% interest in Rook I, location of the Arrow Discovery in February 2014and Bow Discovery in March 2015and the Harpoon discovery in August 2016. The Arrow deposit's updated mineral resource estimate with an effective date of December 20, 2016was released in March 2017, and comprised 179.5 M lbs U3O8 contained in 1.18 M tonnes grading 6.88% U3O8 in the indicated mineral resource category and an additional 122.1 M lbs U3O8 contained in 4.25 M tonnes grading 1.30% U3O8 in the inferred mineral resource category.

Technical Information

All scientific and technical information in this news release has been prepared by or reviewed and approved by Mr. Garrett Ainsworth, P.Geo., Vice President – Exploration & Development for NexGen. Mr. Ainsworth is a qualified person for the purposes of National Instrument 43-101 – _Standards of Disclosure for Mineral Projects_("NI 43-101") of the Canadian Securities Administrators, and has verified the sampling, analytical, and test data underlying the information or opinions contained herein by reviewing original data certificates and monitoring all of the data collection protocols. For details of the Rook I Project including the quality assurance program and quality control measures applied and key assumptions, parameters and methods used to estimate the mineral resource set forth herein please refer to the technical report entitled "Technical Report on the Rook 1 Property, Saskatchewan, Canada" dated effective March 31, 2017(the "Rook 1 Technical Report"). The Rook I Technical Report is available on NexGen's issuer profile on SEDAR at www.sedar.com. All intersections are downhole, true thicknesses are yet to be determined. Resource modelling in conjunction with an updated mineral resource estimate is required before true thicknesses can be estimated.

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