NexGen Releases Second Batch of Assay Results from the 2019 Feasibility Stage Drilling Program, Intersects High-Grade Uranium in All A2 and A3 High-Grade Domain Targets

2019-11-20

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VANCOUVER, Nov. 20, 2019

VANCOUVER, Nov. 20, 2019/CNW/ - NexGen Energy Ltd. ("NexGen" or the "Company") (TSX: NXE, NYSE MKT: NXE)is pleased to report assay results for an additional twenty holes from the Company's recently completed Feasibility-stage drilling program at the 100% owned, Rook I property in the AthabascaBasin, Saskatchewan.

The 2019 drilling program targeted the A2 and A3 High-Grade Domains for the highest confidence resource within the Pre-Feasibility Study ("PFS") mine design (see News Release dated November 5, 2018) at a drill hole spacing of between 9.0 mand 17.0 m(based on a geostatistical data spacing report compiled by Clayton V. Deutschfrom Resource Modeling Solutions).

The density of drilling intersecting the A2 and A3 Indicated Domains results in a high degree of confidence in the mineralized contacts, domain geometry, domain orientation, grade and volume of mineralization. The A2 and A3 Indicated Domains from the PFS have been intersected by 309 drill holes from 133 collars (inclusive of 124 drill holes from 48 collars in 2019): 86 piercing the Indicated Domains from the northwest, 221 from the southeast, and 2 vertical intersections in 2014 (see Figures 1, 2, and 3). All 2019 drill holes were collared at a steep inclination, then shallowed out between -55° and -60° before intersecting the target by utilizing the latest in directional drilling technology.

The results below highlight intersections through the A2 and A3 High-Grade Domains only designed to infill the A2 and A3 domains from indicated to measured resource definition. For complete hole results please see Table 1.

A2 High-Grade Domains

AR-19-229c2 intersected 48.0 mat 3.81% U3O8(624.0 to 672.0 m) including 6.0 mat 13.50% U3O8(627.0 to 633.0 m). The target was intersected at a dip of -54.1°, approximately 10.0 malong strike to the southwest of AR-16-096c3 (21.5 mat 2.33% U3O8);

AR-19-229c4 intersected 41.0 mat 3.42% U3O8(612.5 to 653.5 m) including 7.0 mat 15.48% U3O8(639.5 to 646.5 m). The target was intersected at a dip of -55.2°, approximately 9.0 malong strike to the southwest of AR-16-096c1 (24.0 mat 5.88% U3O8including 8.0 mat 15.44% U3O8);

AR-19-230c3 intersected 21.0 mat 5.06% U3O8(593.5 to 614.5 m) including 4.0 mat 18.38% U3O8(594.5 to 598.5 m). The target was intersected at a dip of -57.4°, approximately 10.0 mup-dip from AR-16-092c1 (58.0 mat 0.99% U3O8and an additional 19.5 mat 1.43% U3O8);

AR-19-234c2 intersected 32.0 mat 3.08% U3O8(471.5 to 503.5 m) including 13.0 mat 7.33% U3O8(486.5 to 499.5 m). The target was intersected at a dip of -54.1°, approximately 10.0 malong strike to the southwest of AR-16-096c3 (21.5 mat 2.33% U3O8);

AR-19-235c1 intersected 29.0 mat 5.45% U3O8(561.5 to 590.5 m) including 11.0 mat 14.09% U3O8(568.5 to 579.5 m). The target was intersected at a dip of -57.2°, approximately 12.0 mdown-dip from AR-16-091c4 (43.5 mat 4.95% U3O8including 12 mat 16.7% U3O8);

A3 High-Grade Domains

AR-19-231c2 intersected 41.0 mat 1.61% U3O8(505.5 to 546.5 m) including 3.0 mat 15.64% U3O8(528.5 to 531.5 m). The target was intersected at a dip of -60.0°, approximately 7.0 mup-dip from AR-17-126c2 (28.0 mat 0.49% U3O8);

AR-19-232c3 intersected 24.0 mat 1.22% U3O8(552.0 to 576.0 m) including 2.0 mat 11.99% U3O8(556.0 to 558.0 m). The target was intersected at a dip of -56.1°, approximately 7.0 mup-dip from AR-16-105c2 (14.0 mat 1.17% U3O8).

Leigh Curyer, Chief Executive Officer, commented: "These exceptional results once again highlight the unique resource characteristics of Arrow. Figures 1-5 of this news release provide an excellent perspective of the drilling density at Arrow. The team continues to advance all aspects of the Feasibility Study scheduled for mid H1 2020 and in parallel the studies for inclusion into the Environmental Assessment scheduled for submission in Q3/2020. Another 80 assays from feasibility drilling are pending release in the coming months."

Troy Boisjoli, Vice-President, Operations and Project Development, commented: "The second batch of assay results from our recently completed Phase I Feasibility-stage drill program demonstrates the exceptional high-grade nature of mineralization across the A2 and A3 domains representing the PFS mine plan design. The Arrow Deposit now has 309 drill holes intersecting the A2 and A3 Indicated Domains at a 9.0 to 17.0 mspacing. From discovery on February 14th, 2014 through the 2019 Phase I program, focused resource development drilling has confirmed our confidence in the grade, volume, and continuity of Arrow. In my experience the density and quality of drilling results is unparalleled with respect to Feasibility level mine design, and mine production."

Development, Permitting, Appointments, Activities & Financial

The completed winter 2019 drilling program comprised 131 holes totaling 57,282.4 m. 117 drill holes, totaling 50,968 m(inclusive of 32 min overcuts) focused on infill feasibility study drilling and 14 drill holes totaling 6,314.4 mprimarily designed to test the geotechnical and hydrogeological characteristics of the rock mass in areas of proposed mine workings and UGTMF.

A total of 80 assays remain pending from the Feasibility-stage drilling program including 14 dual purpose holes that were drilled to rest geotechnical and hydrogeological characteristics.

NexGen commenced an Environmental Assessment on the Rook I Project on April 29, 2019in accordance with the requirements of both the Environmental Assessment Act and the Canadian Environmental Assessment Act, 2012 ("CEAA 2012") after receiving acceptance of the Rook I Project Description (Technical Proposal) by the Canadian Nuclear Safety Commission ("CNSC") and the Saskatchewan Ministry of Environment ("SMOE"). In addition, NexGen filed an Initial Licence Application with the CNSC under the Nuclear Safety and Control Act in order to obtain a Licence to Prepare Site and Construct for the Project.

As of November 19, 2019, the Company had cash-on-hand of approximately $65 million which fully funds NexGen for all drilling, feasibility and development programs planned this year.

Figure 1 below displays the A2 intersection in AR-19-229c4 7.0 mat 15.48% U3O8within competent host rock (yellow numbers indicate grade % U3O8). Drill hole locations are shown in Figure 5. Full drilling results can be found in Table 1. Drill hole descriptions can be found at www.nexgenenergy.ca

Table 1: Arrow Deposit Drill Hole Data

| Drill Hole | Athabasca Group - Basement

Depth

(m) | From

(m) | To (m) | Width

(m) | U3O8

(wt%) | | | AR-19-225c3 | 327 | -65 | 637 | N/A | 452.50 | 454.50 | 2.0 | 0.70 | | | | | | | 480.50 | 481.50 | 1.0 | 0.08 | | | | | | | 488.00 | 490.00 | 2.0 | 0.03 | | | | | | | 494.00 | 502.00 | 8.0 | 0.03 | | | | | | | 507.00 | 508.00 | 1.0 | 0.02 | | | | | | | 515.00 | 517.00 | 2.0 | 0.02 | | | | | | | 521.00 | 528.00 | 7.0 | 0.03 | | | | | | | 535.00 | 537.00 | 2.0 | 0.01 | | | | | | | 559.00 | 560.00 | 1.0 | 0.01 | | | | | | | 586.50 | 602.50 | 16.0 | 6.95 | | | | | | incl. | 586.50 | 597.50 | 11.0 | 9.98 | | | | | | | 610.50 | 625.50 | 15.0 | 0.02 | | AR-19-229c1 | 327 | -65 | 693 | 132.8 | 467.00 | 468.00 | 1.0 | 0.01 | | | | | | | 473.00 | 477.00 | 4.0 | 0.06 | | | | | | | 488.00 | 489.00 | 1.0 | 0.33 | | | | | | | 500.00 | 539.00 | 39.0 | 0.40 | | | | | | | 543.00 | 550.00 | 7.0 | 1.81 | | | | | | incl. | 546.00 | 550.00 | 4.0 | 3.10 | | | | | | | 570.00 | 570.50 | 0.5 | 0.04 | | | | | | | 619.50 | 621.50 | 2.0 | 0.01 | | | | | | | 628.50 | 634.50 | 6.0 | 4.43 | | | | | | incl. | 629.50 | 632.50 | 3.0 | 8.26 | | | | | | | 641.50 | 645.50 | 4.0 | 0.54 | | | | | | | 650.50 | 677.50 | 27.0 | 1.45 | | | | | | incl. | 659.50 | 668.50 | 9.0 | 2.53 | | AR-19-229c2 | 327 | -65 | 699 | N/A | 494.50 | 495.00 | 0.5 | 0.06 | | | | | | | 500.50 | 501.50 | 1.0 | 0.16 | | | | | | | 504.50 | 508.50 | 4.0 | 0.14 | | | | | | | 513.50 | 514.50 | 1.0 | 0.18 | | | | | | | 517.50 | 519.50 | 2.0 | 0.44 | | | | | | | 524.50 | 536.50 | 12.0 | 0.06 | | | | | | | 541.50 | 545.50 | 4.0 | 0.62 | | | | | | | 548.50 | 562.50 | 14.0 | 0.67 | | | | | | incl. | 550.50 | 555.50 | 5.0 | 1.57 | | | | | | | 573.50 | 577.50 | 4.0 | 0.03 | | | | | | | 624.00 | 672.00 | 48.0 | 3.81 | | | | | | incl. | 627.00 | 633.00 | 6.0 | 13.50 | | | | | | incl. | 647.00 | 662.00 | 15.0 | 5.85 | | AR-19-229c3 | 327 | -65 | 720 | N/A | 493.50 | 496.50 | 3.0 | 0.29 | | | | | | | 502.00 | 503.00 | 1.0 | 3.44 | | | | | | | 507.00 | 514.00 | 7.0 | 0.08 | | | | | | | 517.00 | 518.00 | 1.0 | 1.37 | | | | | | | 522.00 | 525.00 | 3.0 | 0.31 | | | | | | | 529.00 | 531.00 | 2.0 | 0.51 | | | | | | | 540.00 | 548.00 | 8.0 | 0.40 | | | | | | | 558.00 | 565.00 | 7.0 | 2.49 | | | | | | incl. | 560.00 | 561.00 | 1.0 | 15.90 | | | | | | | 570.00 | 573.00 | 3.0 | 0.12 | | | | | | | 579.00 | 586.00 | 7.0 | 0.09 | | | | | | | 589.00 | 595.00 | 6.0 | 0.02 | | | | | | | 627.50 | 685.50 | 58.0 | 1.88 | | | | | | incl. | 639.50 | 642.50 | 3.0 | 4.51 | | | | | | incl. | 654.50 | 663.50 | 9.0 | 7.54 | | | | | | incl. | 669.50 | 674.50 | 5.0 | 4.13 | | | | | | | 703.50 | 708.50 | 5.0 | 0.03 | | | | | | | 711.50 | 718.50 | 7.0 | 0.02 | | AR-19-229c4 | 327 | -65 | 675 | N/A | 404.00 | 405.50 | 1.5 | 0.01 | | | | | | | 415.50 | 416.00 | 0.5 | 0.02 | | | | | | | 464.00 | 467.00 | 3.0 | 0.11 | | | | | | | 471.00 | 475.00 | 4.0 | 0.03 | | | | | | | 480.00 | 491.00 | 11.0 | 0.50 | | | | | | incl. | 483.00 | 484.00 | 1.0 | 4.36 | | | | | | | 494.00 | 505.00 | 11.0 | 0.26 | | | | | | | 508.00 | 511.00 | 3.0 | 1.04 | | | | | | | 516.00 | 532.00 | 16.0 | 0.22 | | | | | | | 595.00 | 595.50 | 0.5 | 0.05 | | | | | | | 612.50 | 653.50 | 41.0 | 3.42 | | | | | | incl. | 617.50 | 618.50 | 1.0 | 10.60 | | | | | | incl. | 639.50 | 646.50 | 7.0 | 15.48 | | AR-19-230c1 | 327 | -65 | 651.5 | 128.35 | 499.00 | 503.00 | 4.0 | 0.03 | | | | | | | 515.00 | 536.00 | 21.0 | 0.07 | | | | | | | 556.00 | 557.00 | 1.0 | 0.02 | | | | | | | 565.00 | 567.00 | 2.0 | 0.04 | | | | | | | 571.00 | 572.00 | 1.0 | 0.12 | | | | | | | 577.00 | 599.00 | 22.0 | 0.69 | | | | | | incl. | 587.00 | 592.00 | 5.0 | 2.54 | | | | | | | 602.00 | 612.00 | 10.0 | 0.03 | | | | | | | 620.00 | 632.00 | 12.0 | 0.05 | | | | | | | 645.00 | 646.00 | 1.0 | 0.02 | | AR-19-230c2 | 327 | -65 | 663.5 | N/A | 474.50 | 475.00 | 0.5 | 0.03 | | | | | | | 484.00 | 484.50 | 0.5 | 0.04 | | | | | | | 496.50 | 501.50 | 5.0 | 0.93 | | | | | | incl. | 499.50 | 501.50 | 2.0 | 1.98 | | | | | | | 522.50 | 523.50 | 1.0 | 0.02 | | | | | | | 551.00 | 564.00 | 13.0 | 0.06 | | | | | | | 567.00 | 573.00 | 6.0 | 0.02 | | | | | | | 585.00 | 610.00 | 25.0 | 4.49 | | | | | | incl. | 588.00 | 598.00 | 10.0 | 11.10 | | | | | | | 613.00 | 618.00 | 5.0 | 0.06 | | | | | | | 621.00 | 630.00 | 9.0 | 0.28 | | AR-19-230c3 | 327 | -65 | 660 | N/A | 487.00 | 487.50 | 0.5 | 0.07 | | | | | | | 501.00 | 501.50 | 0.5 | 0.01 | | | | | | | 504.00 | 504.50 | 0.5 | 0.13 | | | | | | | 507.50 | 508.00 | 0.5 | 0.03 | | | | | | | 514.00 | 519.00 | 5.0 | 0.02 | | | | | | | 522.00 | 524.00 | 2.0 | 0.01 | | | | | | | 531.50 | 532.50 | 1.0 | 0.02 | | | | | | | 555.50 | 556.50 | 1.0 | 0.01 | | | | | | | 561.50 | 568.50 | 7.0 | 0.02 | | | | | | | 575.50 | 576.50 | 1.0 | 0.01 | | | | | | | 593.50 | 614.50 | 21.0 | 5.06 | | | | | | incl. | 594.50 | 598.50 | 4.0 | 18.38 | | | | | | | 619.50 | 632.50 | 13.0 | 0.08 | | | | | | | 654.50 | 655.50 | 1.0 | 0.02 | | AR-19-231c1 | 327 | -65 | 564.5 | 138 | 458.00 | 471.00 | 13.0 | 0.08 | | | | | | | 487.00 | 488.00 | 1.0 | 0.01 | | | | | | | 497.00 | 505.00 | 8.0 | 0.34 | | | | | | | 510.00 | 511.00 | 1.0 | 0.04 | | | | | | | 515.00 | 535.00 | 20.0 | 0.59 | | | | | | incl. | 518.00 | 524.00 | 6.0 | 1.84 | | AR-19-231c2 | 327 | -65 | 585.5 | N/A | 459.50 | 472.50 | 13.0 | 0.53 | | | | | | incl. | 470.50 | 472.50 | 2.0 | 3.07 | | | | | | | 480.50 | 481.50 | 1.0 | 0.47 | | | | | | | 484.50 | 495.50 | 11.0 | 0.06 | | | | | | | 498.50 | 499.50 | 1.0 | 0.59 | | | | | | | 505.50 | 546.50 | 41.0 | 1.61 | | | | | | incl. | 505.50 | 506.50 | 1.0 | 5.87 | | | | | | incl. | 528.50 | 531.50 | 3.0 | 15.64 | | | | | | | 554.50 | 556.50 | 2.0 | 0.02 | | AR-19-231c3 | 327 | -65 | 600.5 | N/A | 503.50 | 527.50 | 24.0 | 1.12 | | | | | | incl. | 519.50 | 521.50 | 2.0 | 10.62 | | | | | | | 535.50 | 561.50 | 26.0 | 0.46 | | | | | | incl. | 540.50 | 542.50 | 2.0 | 2.92 | | | | | | | 570.50 | 571.50 | 1.0 | 0.04 | | AR-19-232c1 | 327 | -65 | 642.5 | 138.8 | 476.50 | 481.50 | 5.0 | 0.04 | | | | | | | 484.50 | 486.50 | 2.0 | 0.03 | | | | | | | 489.50 | 494.00 | 4.5 | 0.03 | | | | | | | 506.50 | 507.50 | 1.0 | 0.13 | | | | | | | 517.00 | 520.00 | 3.0 | 0.26 | | | | | | | 534.00 | 537.00 | 3.0 | 0.41 | | | | | | incl. | 536.00 | 537.00 | 1.0 | 1.20 | | | | | | | 544.00 | 545.00 | 1.0 | 1.52 | | | | | | | 548.00 | 552.00 | 4.0 | 0.26 | | | | | | | 563.00 | 570.00 | 7.0 | 0.40 | | | | | | incl. | 563.00 | 564.00 | 1.0 | 2.15 | | | | | | | 574.00 | 598.00 | 24.0 | 0.23 | | | | | | incl. | 590.00 | 591.00 | 1.0 | 2.18 | | | | | | | 601.00 | 604.00 | 3.0 | 0.13 | | | | | | | 607.00 | 610.00 | 3.0 | 0.05 | | | | | | | 616.00 | 617.00 | 1.0 | 0.02 | | AR-19-232c2 | 327 | -65 | 642.5 | N/A | 454.50 | 458.00 | 3.5 | 0.04 | | | | | | | 486.00 | 487.00 | 1.0 | 0.04 | | | | | | | 491.00 | 495.00 | 4.0 | 0.03 | | | | | | | 516.00 | 519.00 | 3.0 | 0.26 | | | | | | | 531.00 | 535.00 | 4.0 | 0.23 | | | | | | | 539.00 | 540.00 | 1.0 | 0.22 | | | | | | | 550.00 | 553.00 | 3.0 | 2.14 | | | | | | incl. | 552.00 | 553.00 | 1.0 | 6.36 | | | | | | | 556.00 | 557.00 | 1.0 | 0.03 | | | | | | | 560.00 | 564.00 | 4.0 | 0.60 | | | | | | incl. | 563.00 | 564.00 | 1.0 | 1.50 | | | | | | | 574.00 | 594.00 | 20.0 | 0.17 | | | | | | | 597.00 | 600.00 | 3.0 | 0.03 | | AR-19-232c3 | 327 | -65 | 648.5 | N/A | 471.50 | 476.00 | 4.5 | 0.03 | | | | | | | 478.50 | 479.00 | 0.5 | 0.01 | | | | | | | 481.50 | 484.00 | 2.5 | 0.02 | | | | | | | 491.00 | 497.00 | 6.0 | 0.03 | | | | | | | 500.00 | 501.00 | 1.0 | 0.01 | | | | | | | 504.00 | 506.00 | 2.0 | 0.03 | | | | | | | 519.00 | 520.00 | 1.0 | 0.02 | | | | | | | 530.00 | 534.00 | 4.0 | 1.01 | | | | | | | 552.00 | 576.00 | 24.0 | 1.22 | | | | | | incl. | 556.00 | 558.00 | 2.0 | 11.99 | | | | | | | 580.00 | 581.00 | 1.0 | 0.02 | | | | | | | 589.00 | 592.00 | 3.0 | 1.72 | | | | | | | 599.00 | 600.00 | 1.0 | 0.02 | | | | | | | 606.00 | 621.00 | 15.0 | 3.86 | | | | | | incl. | 609.00 | 613.00 | 4.0 | 13.26 | | | | | | | 630.00 | 631.00 | 1.0 | 0.01 | | AR-19-233c3 | 327 | -65 | 555.5 | N/A | 450.00 | 469.00 | 19.0 | 0.04 | | | | | | | 472.00 | 473.00 | 1.0 | 0.01 | | | | | | | 482.00 | 493.00 | 11.0 | 0.54 | | | | | | incl. | 485.00 | 490.00 | 5.0 | 1.13 | | | | | | | 500.00 | 524.00 | 24.0 | 0.18 | | | | | | incl. | 508.00 | 509.00 | 1.0 | 1.70 | | | | | | | 536.00 | 543.00 | 7.0 | 0.06 | | AR-19-234c1 | 327 | -65 | 522 | 127.5 | 471.00 | 494.00 | 23.0 | 0.67 | | AR-19-234c2 | 327 | -65 | 531 | N/A | 471.50 | 503.50 | 32.0 | 3.08 | | | | | | incl. | 486.50 | 499.50 | 13.0 | 7.33 | | AR-19-235c1 | 327 | -65 | 620 | 132.7 | 425.50 | 429.50 | 4.0 | 0.02 | | | | | | | 440.50 | 441.50 | 1.0 | 0.25 | | | | | | | 452.50 | 462.50 | 10.0 | 0.02 | | | | | | | 478.50 | 480.50 | 2.0 | 0.03 | | | | | | | 492.50 | 509.50 | 17.0 | 0.12 | | | | | | | 519.50 | 527.50 | 8.0 | 0.05 | | | | | | | 530.50 | 536.50 | 6.0 | 0.04 | | | | | | | 544.50 | 548.50 | 4.0 | 0.02 | | | | | | | 561.50 | 590.50 | 29.0 | 5.45 | | | | | | incl. | 568.50 | 579.50 | 11.0 | 14.09 | | | | | | | 601.50 | 606.50 | 5.0 | 0.02 | | AR-19-236c1 | 327 | -65 | 660.5 | 133.95 | 465.00 | 467.00 | 2.0 | 0.11 | | | | | | | 478.50 | 479.00 | 0.5 | 0.02 | | | | | | | 500.50 | 504.50 | 4.0 | 0.05 | | | | | | | 515.50 | 532.50 | 17.0 | 0.30 | | | | | | incl. | 518.50 | 521.50 | 3.0 | 1.38 | | | | | | | 549.50 | 552.00 | 2.5 | 0.01 | | | | | | | 586.50 | 587.50 | 1.0 | 0.03 | | | | | | | 596.50 | 597.50 | 1.0 | 0.03 | | | | | | | 600.50 | 619.50 | 19.0 | 5.98 | | | | | | incl. | 600.50 | 615.50 | 15.0 | 7.55 | | | | | | | 623.50 | 624.50 | 1.0 | 0.04 | | | | | | | 628.50 | 634.50 | 6.0 | 0.04 | | | | | | | 637.50 | 643.50 | 6.0 | 0.07 | | | | | | | 659.00 | 660.50 | 1.5 | 0.07 | | AR-19-236c2 | 327 | -65 | 672.5 | N/A | 457.00 | 457.50 | 0.5 | 0.26 | | | | | | | 465.00 | 465.50 | 0.5 | 0.08 | | | | | | | 469.00 | 469.50 | 0.5 | 0.02 | | | | | | | 473.50 | 474.00 | 0.5 | 0.08 | | | | | | | 477.50 | 478.50 | 1.0 | 0.03 | | | | | | | 486.50 | 487.50 | 1.0 | 0.36 | | | | | | | 494.00 | 494.50 | 0.5 | 0.11 | | | | | | | 497.00 | 497.50 | 0.5 | 0.06 | | | | | | | 502.00 | 502.50 | 0.5 | 0.09 | | | | | | | 509.00 | 519.00 | 10.0 | 0.06 | | | | | | | 522.50 | 533.50 | 11.0 | 0.37 | | | | | | incl. | 528.50 | 529.50 | 1.0 | 1.34 | | | | | | | 536.50 | 537.50 | 1.0 | 0.01 | | | | | | | 541.50 | 542.50 | 1.0 | 0.02 | | | | | | | 545.50 | 546.50 | 1.0 | 0.01 | | | | | | | 572.50 | 573.50 | 1.0 | 0.02 | | | | | | | 587.00 | 590.00 | 3.0 | 0.04 | | | | | | | 599.00 | 609.00 | 10.0 | 0.02 | | | | | | | 613.00 | 630.00 | 17.0 | 3.24 | | | | | | incl. | 613.00 | 617.00 | 4.0 | 1.93 | | | | | | incl. | 622.00 | 629.00 | 7.0 | 6.55 | | | | | | | 639.00 | 655.00 | 16.0 | 0.11 | | | | | | | 661.00 | 662.00 | 1.0 | 0.02 | | | | | | | 669.00 | 671.00 | 2.0 | 0.15 |

Parameters:

Maximum internal dilution 2.0 mdownhole Minimum thickness of 0.5 mdownhole Cutoff grade 0.01% U3O8 All depths and intervals are metres 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 determined Directional drilling has often resulted in mineralization intersected at a more favourable and shallower dip

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 uranium deposits and in developing projects through discovery to production.

NexGen owns a portfolio of prospective uranium exploration assets in the Athabasca Basin, Saskatchewan, Canada; including a 100% interest in Rook I, location of the Arrow Deposit discovered in February 2014, the Bow discovery in March 2015, the Harpoon discovery in August 2016 and the Arrow South discovery in July 2017. NexGen is the recipient of the PDAC's 2018 Bill Dennis Award and the 2019 Environmental and Social Responsibility Award.

Technical Disclosure

The technical information in this news release with respect to the PFS has been reviewed and approved by Paul O'Hara, P.Eng. of Wood., David Robson, P.Eng., M.B.A., and Jason Cox, P.Eng. of RPA, each of whom is a "qualified person" under National Instrument 43-101 – _Standards of Disclosure for Mineral Projects_("NI-43-101").

The Mineral Resource Estimate was completed by Mr. Mark Mathisen, C.P.G., Senior Geologist at RPA and Mr. David Ross, P.Geo., Director of Resource Estimation and Principal Geologist at RPA. Both are independent Qualified Persons in accordance with the requirements of National Instrument (NI) 43-101 and they have approved the disclosure herein. All other technical information in this news release has been approved by Mr. Troy Boisjoli, Geoscientist Licensee, Vice President – Operations & Project Development for NexGen. Mr. Boisjoli is a qualified person for the purposes of NI 43-101 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. All other technical information in this news release has been approved by Mr. James Hatley, a Professional Engineer, Senior Vice-President – Project Development for NexGen. Mr. Hatley is a qualified person for the purposes of NI 43-101 and has reviewed the underlying the information or opinions contained herein on mine design.