NexGen Intersects High-Grade Mineralization in all Twenty A2 and A3 Targets from the 2019 Feasibility Stage Drilling Program

2019-05-28

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VANCOUVER, May 28, 2019

VANCOUVER, May 28, 2019/CNW/ - NexGen Energy Ltd. ("NexGen" or the "Company") (TSX: NXE, NYSE MKT: NXE)is pleased to report radioactivity for an additional twenty holes comprising 7,969.5 mfrom the Company's Feasibility stage drilling program at our 100% owned, Rook I property in the AthabascaBasin Saskatchewan.

Objective I: Conversion of Indicated Mineral Resources to Measured Category

This current phase of the 2019 drilling program is targeting the A2 and A3 High-Grade Domain mine planning sections at a spacing between 9.0 mand 16.7 m. The target spacing incorporates the results of a geostatistical data spacing report compiled by Clayton V. Deutschfrom Resource Modeling Solutions based on 189 drill holes, totaling 121,923.15 m, which forms the basis of the Indicated Mineral Resource of 256.6 Mlbs at 4.04 % U3O8. All drill holes are collared at a steep inclination, then shallowed out between -55° and -60° before intersecting the targetby utilizing the latest in directional drilling technology.

Highlights:

A2 High-Grade Domains and Sub-zone

AR-19-229c2 intersected 46.5 mof total composite mineralizationincluding 12.05 mof total composite off-scale radioactivity(>10,000 to >61,000 cps) within an 86.0 msection (602.0 to 688.0 m);

AR-19-229c4 intersected 39.0 mof total composite mineralizationincluding 8.55 mof total composite off-scale radioactivity(>10,000 to >61,000 cps) within an 88.0 msection (578.0 to 666.0 m);

AR-19-230c3 intersected 30.5 mof total composite mineralizationincluding 7.55 mof total composite off-scale radioactivity(>10,000 to >61,000 cps) within a 93.0 msection (564.0 to 657.0 m). Additionally, of the 7.55 mof off-scale mineralization intersected in the hole, 0.5 mof massive-to-semi massive pitchblende with minimum-greater-than-61,000 cps;

AR-19-235c1 intersected 43.0 mof total composite mineralizationincluding 7.15 mof total composite off-scale radioactivity(>10,000 to >61,000 cps) within a 93.0 msection (517.0 to 610.0 m). Additionally, of the 7.15 mof off-scale mineralization intersected in the hole, 3.0 mof massive-to-semi massive pitchblende with minimum-greater-than-61,000 cps;

AR-19-236c2 intersected 26.0 mof total composite mineralizationincluding 6.35 mof total composite off-scale radioactivity(>10,000 to >61,000 cps) within an 89.0 msection (579.0 to 668.0 m.

A3 High-Grade Domains

AR-19-231c2 intersected 48.0 mof total composite mineralizationincluding 5.75 mof total composite off-scale radioactivity(>10,000 to >61,000 cps) within a 102.0 msection (469.0 to 571.0 m);

AR-19-232c3 intersected 26.0 mof total composite mineralizationincluding 5.1 mof total composite off-scale radioactivity(>10,000 to >61,000 cps) within an 89.0 msection (560.0 to 649.0 m).

Drill hole locations and schematics are shown in Figures 1 to 2, drilling results can be found in Table 1. Drill hole descriptions can be found at www.nexgenenergy.ca

Development, Permitting, Appointments, Activities & Financial

Expediting Arrow to Feasibility by a 2-stage (10 rig) high density drilling program focused on mine optimization plans based on Measured and Indicated mineral resources.

As reported on April 29, 2019, NexGen received acceptance of the Rook I Project Description (Technical Proposal) by the Canadian Nuclear Safety Commission ("CNSC") and the Saskatchewan Ministry of Environment ("MOE"). The acceptance marked the commencement of an Environmental Assessment ("EA") on the Rook I Project (the "Project") in accordance with the requirements of both The Environmental Assessment Act (Province of Saskatchewan) and the Canadian Environmental Assessment Act, 2012 "CEAA 2012" (Government of Canada). The EA is being conducted through a coordinated process between the MOE and the CNSC, which is the Federal life-cycle regulator for all uranium mine and mill projects in Canada. 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.

The Company also announces the appointments of Gillian McCombie, Vice President Human Resources and Arthur Lieu, MSc., P.Eng., Vice President Processing and Metallurgy. Gillian brings over 25 years of experience in human resources in the international mining and telecommunications sectors. Gillian most recently as Vice President Human Resources at Capstone Mining and prior to that with Telus and Placer Dome. Arthur joins NexGen having spent 20 years in mine processing and metallurgy. Most recently, he was the Chief Metallurgist at Cameco's Rabbit Lakemill and Orano's McClean Lakemill. Arthur holds a Bachelor of Science degree in Chemical Engineering and a Master of Science degree in Geochemistry, with a focus on source-term characteristic of uranium waste rock piles at Cameco Key Lake uranium mine. Mr. Lieu is also trained in Lean Six Sigma Black Belt process improvement and optimization. Mr. Lieu is a registered Professional Engineer (P. Eng) with the Association of Professional Engineers and Geoscientists of Saskatchewan(APEGS).

The Company had cash-on-hand of approximately $90 millionwhich fully funds NexGen for all drilling, feasibility and development programs planned this year.

Leigh Curyer, Chief Executive Officer, commented: "These continuing high grade results received from sections of the ore body focused on the mine plan, highlight the extraordinary high grade and robustness of Arrow. In parallel, the Feasibility-stage engineering, metallurgical and environmental studies are all advancing extremely well, together with permitting and our community programs. I would like to take the opportunity to also welcome Arthur and Gill to the dedicated NexGen team. Two highly experienced and successful professionals in their respective fields joining NexGen at an incredibly exciting time as we begin to see positive signs emerging in the uranium market."

Troy Boisjoli, Vice-President, Operations and Project Development, commented: "The continuity of mineralization within the high-grade core of Arrow is remarkable and these results highlight the technical advantages at the Arrow Deposit: mineralization hosted within stacked shear system (allowing holes to intersect multiple targets with one drill hole, minimizing total meterage), stable crystalline basement host rock, and extremely high-grades. These high grade results in all twenty holes will be incorporated into an updated Mineral Resource Estimate which will form the basis of the Feasibility Study, scheduled for release in H1 2020."

Table 1: Arrow Deposit 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-19-225c3 | 327 | -65 | 283 | N/A | 452.5 | 454 | 1.5 | <500 - 46000 | | | | | | | 481 | 481.5 | 0.5 | <500 - 800 | | | | | | | 488 | 490 | 2 | <500 - 700 | | | | | | | 494.5 | 498 | 3.5 | <500 - 1050 | | | | | | | 501 | 501.5 | 0.5 | <500 - 1200 | | | | | | | 586.5 | 602 | 15.5 | <500 - 61000 | | | | | | | 610 | 610.5 | 0.5 | <500 - 550 | | | | | | | 615.5 | 618.5 | 3 | <500 - 1800 | | AR-19-229c1 | 327 | -65 | 693 | 132.8 | 473 | 475 | 2 | <500 - 1200 | | | | | | | 480.5 | 481 | 0.5 | <500 - 600 | | | | | | | 488.5 | 489 | 0.5 | 1000 - 13000 | | | | | | | 495 | 495.5 | 0.5 | <500 - 1240 | | | | | | | 501 | 502 | 1 | <500 - 41500 | | | | | | | 504.5 | 509 | 4.5 | <500 - 20200 | | | | | | | 511.5 | 513 | 1.5 | <500 - 4000 | | | | | | | 516.5 | 520 | 3.5 | <500 - 19800 | | | | | | | 522.5 | 533 | 10.5 | <500 - 61000 | | | | | | | 535.5 | 538.5 | 3 | <500 - 49000 | | | | | | | 543.5 | 546.5 | 3 | <500 - 61000 | | | | | | | 549.5 | 550 | 0.5 | 1230 - 61000 | | | | | | | 570 | 570.5 | 0.5 | <500 - 540 | | | | | | | 628.5 | 634 | 5.5 | <500 - 61000 | | | | | | | 638 | 638.5 | 0.5 | <500 - 610 | | | | | | | 642 | 645.5 | 3.5 | <500 - 61000 | | | | | | | 651 | 675.5 | 24.5 | <500 - 61000 | | AR-19-229c2 | 327 | -65 | 309 | N/A | 494.5 | 495 | 0.5 | <500 - 700 | | | | | | | 500.5 | 501 | 0.5 | <500 - 2150 | | | | | | | 505 | 505.5 | 0.5 | <500 - 680 | | | | | | | 508 | 508.5 | 0.5 | <500 - 31000 | | | | | | | 514 | 514.5 | 0.5 | <500 - 9400 | | | | | | | 517.5 | 519 | 1.5 | <500 - 6000 | | | | | | | 524.5 | 525.5 | 1 | <500 - 4000 | | | | | | | 530 | 536.5 | 6.5 | <500 - 8590 | | | | | | | 541.5 | 542.5 | 1 | 580 - 52500 | | | | | | | 545 | 545.5 | 0.5 | <500 - 3200 | | | | | | | 550.5 | 562.5 | 12 | <500 - 61000 | | | | | | | 574.5 | 577 | 2.5 | <500 - 2000 | | | | | | | 625 | 671.5 | 46.5 | <500 - 61000 | | AR-19-229c3 | 327 | -65 | 240 | N/A | 494.5 | 496 | 1.5 | <500 - 14900 | | | | | | | 502 | 503 | 1 | <500 - 53300 | | | | | | | 506.5 | 507.5 | 1 | <500 - 19500 | | | | | | | 510 | 510.5 | 0.5 | <500 - 800 | | | | | | | 513.5 | 514 | 0.5 | <500 - 1100 | | | | | | | 517 | 518 | 1 | <500 - 12100 | | | | | | | 522 | 524.5 | 2.5 | <500 - 2800 | | | | | | | 529 | 531 | 2 | <500 - 32600 | | | | | | | 539.5 | 541.5 | 2 | <500 - 14100 | | | | | | | 544.5 | 549.5 | 5 | <500 - 47900 | | | | | | | 558 | 561 | 3 | <500 - 61000 | | | | | | | 563.5 | 565 | 1.5 | <500 - 14000 | | | | | | | 571 | 573 | 2 | <500 - 2100 | | | | | | | 579 | 586 | 7 | <500 - 1500 | | | | | | | 592.5 | 594.5 | 2 | <500 - 610 | | | | | | | 629.5 | 645.5 | 16 | <500 - 61000 | | | | | | | 648 | 651.5 | 3.5 | <500 - 4400 | | | | | | | 654 | 680 | 26 | <500 - 61000 | | | | | | | 683 | 683.5 | 0.5 | <500 - 1350 | | | | | | | 705 | 707 | 2 | <500 - 930 | | | | | | | 711.5 | 718 | 6.5 | <500 - 1300 | | AR-19-229c4 | 327 | -65 | 465 | N/A | 404 | 405.5 | 1.5 | <500 - 600 | | | | | | | 415.5 | 416 | 0.5 | <500 - 820 | | | | | | | 464 | 466 | 2 | <500 - 3150 | | | | | | | 471.5 | 472.5 | 1 | <500 - 2300 | | | | | | | 480 | 486.5 | 6.5 | <500 - 61000 | | | | | | | 489 | 489.5 | 0.5 | <500 - 1300 | | | | | | | 494 | 499 | 5 | <500 - 18600 | | | | | | | 501.5 | 505 | 3.5 | <500 - 32000 | | | | | | | 508.5 | 510.5 | 2 | <500 - 43000 | | | | | | | 516.5 | 531.5 | 15 | <500 - 39000 | | | | | | | 613.5 | 652.5 | 39 | <500 - 61000 | | AR-19-230c1 | 327 | -65 | 651.5 | 128.35 | 499 | 499.5 | 0.5 | <500 - 4800 | | | | | | | 502 | 502.5 | 0.5 | <500 - 1200 | | | | | | | 515.5 | 522 | 6.5 | <500 - 3200 | | | | | | | 524.5 | 532.5 | 8 | <500 - 1700 | | | | | | | 566 | 566.5 | 0.5 | <500 - 550 | | | | | | | 571 | 572 | 1 | <500 - 1300 | | | | | | | 577 | 598.5 | 21.5 | <500 - 61000 | | | | | | | 603 | 605.5 | 2.5 | <500 - 1200 | | | | | | | 608 | 608.5 | 0.5 | <500 - 1650 | | | | | | | 611 | 611.5 | 0.5 | <500 - 1160 | | | | | | | 622 | 628.5 | 6.5 | <500 - 1800 | | | | | | | 631.5 | 632 | 0.5 | <500 - 6600 | | AR-19-230c2 | 327 | -65 | 252.5 | N/A | 484 | 484.5 | 0.5 | <500 - 750 | | | | | | | 496.5 | 501 | 4.5 | <500 - 50200 | | | | | | | 522.5 | 523 | 0.5 | <500 - 575 | | | | | | | 552 | 556.5 | 4.5 | <500 - 740 | | | | | | | 559 | 563 | 4 | <500 - 1400 | | | | | | | 570.5 | 572 | 1.5 | <500 - 620 | | | | | | | 586 | 609.5 | 23.5 | <500 - 61000 | | | | | | | 613.5 | 614.5 | 1 | <500 - 3200 | | | | | | | 617 | 618 | 1 | <500 - 750 | | | | | | | 621.5 | 630 | 8.5 | <500 - 15600 | | | | | | | 636 | 636.5 | 0.5 | <500 - 970 | | AR-19-230c3 | 327 | -65 | 234 | N/A | 458 | 458.5 | 0.5 | <500 - 1030 | | | | | | | 461.5 | 463.5 | 2 | <500 - 820 | | | | | | | 474.5 | 475 | 0.5 | <500 - 680 | | | | | | | 487 | 487.5 | 0.5 | <500 - 910 | | | | | | | 504 | 504.5 | 0.5 | <500 - 1030 | | | | | | | 521.5 | 524 | 2.5 | <500 - 730 | | | | | | | 561.5 | 562.5 | 1 | <500 - 1310 | | | | | | | 567.5 | 568 | 0.5 | <500 - 510 | | | | | | | 592 | 614.5 | 22.5 | <500 - 61000 | | | | | | | 619.5 | 623.5 | 4 | <500 - 1280 | | | | | | | 626.5 | 628.5 | 2 | <500 - 14500 | | | | | | | 654.5 | 655 | 0.5 | <500 - 540 | | AR-19-231c1 | 327 | -65 | 564.5 | 138 | 466 | 470.5 | 4.5 | <500 - 14000 | | | | | | | 487.5 | 488 | 0.5 | <500 - 500 | | | | | | | 497 | 505 | 8 | <500 - 46000 | | | | | | | 510.5 | 511 | 0.5 | <500 - 900 | | | | | | | 515.5 | 528 | 12.5 | <500 - 58000 | | AR-19-231c2 | 327 | -65 | 222.5 | N/A | 467.5 | 472.5 | 5 | <500 - 38000 | | | | | | | 480.5 | 481 | 0.5 | 500 - 7500 | | | | | | | 485 | 488 | 3 | <500 - 2700 | | | | | | | 491 | 493.5 | 2.5 | <500 - 3100 | | | | | | | 498.5 | 499 | 0.5 | 500 - 6200 | | | | | | | 505.5 | 546.5 | 41 | <500 - 61000 | | | | | | | 555 | 555.5 | 0.5 | <500 - 770 | | AR-19-231c3 | 327 | -65 | 261.5 | N/A | 505.5 | 506 | 0.5 | <500 - 2100 | | | | | | | 509 | 523.5 | 14.5 | <500 - 61000 | | | | | | | 527 | 528 | 1 | <500 - 650 | | | | | | | 535.5 | 557 | 21.5 | <500 - 61000 | | | | | | | 559.5 | 560.5 | 1 | <500 - 1400 | | | | | | | 567.5 | 568 | 0.5 | <500 - 560 | | | | | | | 571 | 571.5 | 0.5 | <500 - 1100 | | AR-19-232c1 | 327 | -65 | 642.5 | 138.8 | 211.5 | 212 | 0.5 | <500 - 650 | | | | | | | 477.5 | 481.5 | 4 | <500 - 2200 | | | | | | | 485.5 | 486.5 | 1 | <500 - 600 | | | | | | | 493 | 494 | 1 | <500 - 1700 | | | | | | | 506.5 | 507.5 | 1 | <500 - 1450 | | | | | | | 517 | 520 | 3 | <500 - 12000 | | | | | | | 534 | 537 | 3 | <500 - 24000 | | | | | | | 544 | 544.5 | 0.5 | 2200 - 51000 | | | | | | | 548 | 552 | 4 | <500 - 5300 | | | | | | | 563.5 | 565 | 1.5 | <500 - 44000 | | | | | | | 568 | 570 | 2 | <500 - 5700 | | | | | | | 574 | 574.5 | 0.5 | <500 - 1800 | | | | | | | 577 | 577.5 | 0.5 | <500 - 680 | | | | | | | 580.5 | 598 | 17.5 | <500 - 23000 | | | | | | | 601 | 604 | 3 | <500 - 3600 | | | | | | | 607.5 | 609.5 | 2 | <500 - 1200 | | AR-19-232c2 | 327 | -65 | 278.5 | N/A | 454.5 | 458 | 3.5 | <500 - 2100 | | | | | | | 486 | 486.5 | 0.5 | <500 - 660 | | | | | | | 492 | 495 | 3 | <500 - 960 | | | | | | | 516 | 518.5 | 2.5 | <500 - 7500 | | | | | | | 531.5 | 534.5 | 3 | <500 - 14100 | | | | | | | 539.5 | 540 | 0.5 | <500 - 5700 | | | | | | | 550 | 553 | 3 | <500 - 61000 | | | | | | | 556 | 556.5 | 0.5 | <500 - 1350 | | | | | | | 560.5 | 564 | 3.5 | <500 - 39000 | | | | | | | 571 | 571.5 | 0.5 | <500 - 720 | | | | | | | 574.5 | 594 | 19.5 | <500 - 14200 | | | | | | | 599.5 | 600 | 0.5 | <500 - 860 | | AR-19-232c3 | 327 | -65 | 294.5 | N/A | 473 | 473.5 | 0.5 | <500 - 620 | | | | | | | 483.5 | 484 | 0.5 | <500 - 840 | | | | | | | 492 | 493.5 | 1.5 | <500 - 2100 | | | | | | | 504.5 | 505.5 | 1 | <500 - 960 | | | | | | | 519.5 | 520 | 0.5 | <500 - 600 | | | | | | | 530 | 531.5 | 1.5 | <500 - 31000 | | | | | | | 552 | 560.5 | 8.5 | <500 - 61000 | | | | | | | 563 | 569.5 | 6.5 | <500 - 17200 | | | | | | | 572 | 575.5 | 3.5 | <500 - 15700 | | | | | | | 580.5 | 581 | 0.5 | <500 - 690 | | | | | | | 589 | 592 | 3 | <500 - 54600 | | | | | | | 599 | 599.5 | 0.5 | <500 - 840 | | | | | | | 606 | 617.5 | 11.5 | <500 - 61000 | | | | | | | 620 | 620.5 | 0.5 | <500 - 1900 | | AR-19-233c3 | 327 | -65 | 276.5 | N/A | 451 | 456.5 | 5.5 | <500 - 980 | | | | | | | 459 | 466 | 7 | <500 - 1500 | | | | | | | 468.5 | 469 | 0.5 | <500 - 550 | | | | | | | 483 | 490 | 7 | <500 - 43700 | | | | | | | 498.5 | 510.5 | 12 | <500 - 17200 | | | | | | | 514 | 517.5 | 3.5 | <500 - 1700 | | | | | | | 520.5 | 523.5 | 3 | <500 - 3200 | | | | | | | 536.5 | 540 | 3.5 | <500 - 1600 | | | | | | | 542.5 | 543 | 0.5 | <500 - 600 | | AR-19-234c1 | 327 | -65 | 522 | 127.5 | 472 | 491 | 19 | <500 - 61000 | | AR-19-234c2 | 327 | -65 | 177 | N/A | 471.5 | 503.5 | 32 | <500 - 61000 | | AR-19-235c1 | 327 | -65 | 620 | 132.7 | 425.5 | 427 | 1.5 | <500 - 950 | | | | | | | 440.5 | 441.5 | 1 | <500 - 4500 | | | | | | | 452.5 | 453.5 | 1 | <500 - 660 | | | | | | | 456.5 | 462 | 5.5 | <500 - 1300 | | | | | | | 478.5 | 479 | 0.5 | <500 - 1400 | | | | | | | 492.5 | 509.5 | 17 | <500 - 4500 | | | | | | | 526 | 526.5 | 0.5 | <500 - 1200 | | | | | | | 534 | 534.5 | 0.5 | <500 - 520 | | | | | | | 547.5 | 548 | 0.5 | <500 - 510 | | | | | | | 563 | 585 | 22 | <500 - 61000 | | | | | | | 588.5 | 590.5 | 2 | <500 - 36000 | | | | | | | 605.5 | 606 | 0.5 | <500 - 550 | | AR-19-236c1 | 327 | -65 | 660.5 | 133.95 | 465 | 466.5 | 1.5 | <500 - 17500 | | | | | | | 478.5 | 479 | 0.5 | <500 - 510 | | | | | | | 500.5 | 501 | 0.5 | <500 - 2200 | | | | | | | 503.5 | 504 | 0.5 | <500 - 1060 | | | | | | | 515.5 | 521.5 | 6 | <500 - 27500 | | | | | | | 525 | 525.5 | 0.5 | 510 - 1050 | | | | | | | 529.5 | 530 | 0.5 | <500 - 630 | | | | | | | 586.5 | 587 | 0.5 | <500 - 530 | | | | | | | 597 | 597.5 | 0.5 | <500 - 780 | | | | | | | 600.5 | 619.5 | 19 | <500 - 61000 | | | | | | | 624 | 624.5 | 0.5 | <500 - 850 | | | | | | | 628.5 | 629.5 | 1 | <500 - 1200 | | | | | | | 633.5 | 634 | 0.5 | <500 - 760 | | | | | | | 637.5 | 642 | 4.5 | <500 - 1650 | | | | | | | 660 | 660.5 | 0.5 | <500 - 1070 | | AR-19-236c2 | 327 | -65 | 321.5 | N/A | 457 | 457.5 | 0.5 | <500 - 5000 | | | | | | | 465 | 465.5 | 0.5 | <500 - 1170 | | | | | | | 468.5 | 469 | 0.5 | <500 - 2650 | | | | | | | 472.5 | 474 | 1.5 | <500 - 1300 | | | | | | | 478 | 478.5 | 0.5 | <500 - 510 | | | | | | | 486.5 | 487.5 | 1 | <500 - 3330 | | | | | | | 494 | 494.5 | 0.5 | <500 - 1100 | | | | | | | 497 | 497.5 | 0.5 | <500 - 710 | | | | | | | 502 | 502.5 | 0.5 | <500 - 1330 | | | | | | | 509 | 519 | 10 | <500 - 3770 | | | | | | | 522.5 | 530 | 7.5 | <500 - 8900 | | | | | | | 573 | 573.5 | 0.5 | <500 - 520 | | | | | | | 588 | 589 | 1 | <500 - 610 | | | | | | | 600 | 601 | 1 | <500 - 800 | | | | | | | 608.5 | 609 | 0.5 | <500 - 510 | | | | | | | 613 | 617.5 | 4.5 | <500 - 61000 | | | | | | | 621 | 629.5 | 8.5 | <500 - 61000 | | | | | | | 639 | 642 | 3 | <500 - 5700 | | | | | | | 645 | 650.5 | 5.5 | <500 - 7700 | | | | | | | 653.5 | 654 | 0.5 | <500 - 510 | | | | | | | 669.5 | 671 | 1.5 | <500 - 5200 |

Parameters:

Maximum internal dilution 2.00 mdownhole All depths and intervals are metres downhole, true thicknesses are yet to be determined "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 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.