NexGen Energy Announces Expansion of High-Grade Zone at Patterson Corridor East (PCE) and the Completion of 2026 Winter Drill Program

About this update from Nexgen Energy Ltd.

Vertical extent of high-grade subdomain increased +33% to 550m with a strike length of 210m High-grade extension in RK-26-280c1 with cumulative 4.2m of >10,000 cps including 0.6m of >61,000 cps Continuity of intense mineralization in RK-26-271c1 with cumulative 12.6m of >10,000 cps including 2.3m of >61,000 cps 80m down plunge of RK-25-256 (5.5m at 21.4% U 3 O 8 ) Progressive high-grade continuity at depth in RK-26-276 with cumulative 11.2m of >10,000 cps including 0.6m of >61,000 cps and RK-26-285 with cumulative 9.0m of >10,000 cps including 0.7m of >61,000 cps Vancouver, British Columbia--(Newsfile Corp. - April 22, 2026) - NexGen Energy Ltd. (TSX: NXE) (NYSE: NXE) (ASX: NXG) ("NexGen" or the "Company") announces results from the 2026 winter drill program at Patterson Corridor East ("PCE") that recently concluded, highlighting significant vertical growth and strong internal continuity of high-grade mineralization. Within the mineralized zone of PCE, the high-grade subdomain has now grown to 550 m in vertical extent, a 33% increase, with a strike length of 210 m. This expansion was primarily driven by hole RK-26-280c1 which returned cumulative 4.2m of >10,000 cps including 0.6m of >61,000 cps at 834m below surface (Figures 1-3). The hole successfully intersected mineralization 230m down plunge along a high-grade shoot interpreted to connect with RK-26-271c1 (Figure 4). Holes RK-26-271c1, RK-26-276, and RK-26-285 returned strong mineralized intercepts between 600 to 700m below surface, where the system remains open for expansion (Figures 1 and 2, Table 1). Results from RK-26-271c1 include cumulative 12.6m of >10,000 cps including 2.3m of >61,000 cps 80m down plunge of RK-25-256 (5.5m at 21.4% U 3 O 8 ) indicating continuity of intense high-grade mineralization (Figure 3). Further, the intersections from RK-26-276 (cumulative 11.2m of >10,000 cps including 0.6m of >61,000 cps) and RK-26-285 (cumulative 9.0m of >10,000 cps including 0.7m of >61,000 cps) add progressive high-grade continuity to the base of this growing subdomain. Drilling 600m to the southeast of PCE along a separate parallel trend, prospective structure and alteration features are vectoring the Company toward potential repetition of mineralization within the overall PCE system (Figure 5). Summer drilling of ~29,200m is schedule to commence the week of May 25, 2026. All samples from 2026 drilling are submitted to the independent Saskatchewan Research Council Geoanalytical Laboratory (SRC), with results to follow. Leigh Curyer, Founder & Chief Executive Officer, commented: "Today's results from the 2026 winter program confirm both the scale and growth of PCE continues to advance at pace. Increasing the vertical extent of the high-grade subdomain by 33% during the winter program, suggests substantial drilling is required going forward to fully understand the extent of this mineralized zone. In parallel, drilling focused on vectoring into additional zones of mineralization will be incorporated into the summer program based on these winter results. "With the Rook I Project commencing construction this summer and the significance of PCE materializing rapidly, we look forward to future drilling and evaluation of PCE and its potential position in the long-term profile of NexGen's uranium portfolio. NexGen is positioned to meet the strong demand for Canadian uranium for many decades into the future, whilst setting a new industry standard in the safe, efficient and reliable delivery of offtake to utility customers around the world." A total of 12,758.2m of the planned 42,000m has been completed in 2026, focusing on high-grade growth and expansion of mineralization. Thirteen drill holes totalling 9,131.7m were dedicated to advancing the mineralization at PCE and six drill holes totalling 3,626.5m tested the parallel trend. Since discovery (see news release date March 11, 2024), 115 drillholes totalling 72,464.7m targeted PCE mineralization (Figure 4) with 79 of the 115 drill holes being mineralized, including 54 intersecting high-grade (>10,000 cps) and 21 intersecting off-scale (>61,000 cps). Figure 1: Interpreted 3D model of PCE shown looking northwest (across strike) and northeast (along strike); previously reported in December 1, 2025 release, now with RK-26-271c1, RK-26-276, RK-26-280c1, and RK-26-285 intersections outlined in purple Figure 2: Interpreted model of mineralization at PCE (as of this release); new holes emphasized by larger diameter pierce points and bold labels; view is a long section that looks perpendicular to the primary mineralized plane; total mineralized footprint in orange and the high-grade subdomains in red Figure 3: Core photo from RK-25-280c1 displays semi-massive, off-scale (>61,000 cps) from uranium vein at 834m down hole Figure 4: Core photo from RK-25-271c1 displays mineralization from 630.3 to 646.5m down hole with abundant high-grade and several instances of off-scale in competent basement rock; yellow outlines >1,000 cps, red outlines >10,000 cps, >61,000 cps outlined in purple Figure 5: Map of PCE with completed 2026 drill holes; ground gravity in background, interpreted fault shown as black dashed line Table 1: Spectrometer results since January 15, 2026 release Drillhole Unconformity Depth (m) Handheld Spectrometer Results (RS-125) Hole ID Azimuth Dip Total Depth (m) From (m) To (m) Width (m) CPS Range RK-26-271c1 275 -75 730.0 - 615.0 616.5 1.5 <500           618.0 619.0 1.0 <500           619.5 627.5 8.0 <500           627.5 627.7 0.2 600 - 2000           627.7 627.8 0.1 >61000           627.8 628.0 0.2 800 - 3000           628.0 630.0 2.0 <500           630.0 630.5 0.5 <500 - 1400           630.5 631.0 0.5 <500           631.0 632.0 1.0 <500 - 900           632.0 632.5 0.5 600 - 1200           632.5 633.0 0.5 <500 - 2200           633.0 633.5 0.5 <500 - 1000           633.5 634.5 1.0 <500 - 900           634.5 635.0 0.5 500 - 40000           635.0 635.5 0.5 <500           635.5 636.0 0.5 <500 - 720           636.0 636.5 0.5 500 - 13000           636.5 636.8 0.3 10000 - 42000           636.8 636.9 0.1 >61000           636.9 637.0 0.1 24000 - 35000           637.0 637.2 0.2 17000 - 50000           637.2 637.4 0.2 >61000           637.4 637.5 0.1 30000 - 50000           637.5 638.0 0.5 500 - 38000           638.0 638.5 0.5 600 - 45000           638.5 638.6 0.1 50000 - 55000           638.6 638.9 0.3 >61000           638.9 639.0 0.1 500 - 55000           639.0 639.3 0.3 >61000           639.3 639.5 0.2 19000 - 57700           639.5 640.0 0.5 <500 - 46200           640.0 640.1 0.1 12200 - 51000           640.1 640.6 0.5 >61000           640.6 641.0 0.4 <500 - 58700           641.0 641.5 0.5 <500 - 49800           641.5 641.8 0.3 >61000           641.8 642.0 0.2 6700 - 41300           642.0 642.1 0.1 >61000           642.1 642.2 0.1 12200 - 51000           642.2 642.3 0.1 >61000           642.3 642.4 0.1 9300 - 51400           642.4 642.7 0.3 >61000           642.7 643.0 0.3 14300 - 46700           643.0 643.5 0.5 <500 - 7300           643.5 644.0 0.5 <500 - 8000           644.0 644.5 0.5 <500 - 1400           644.5 645.0 0.5 <500           645.0 645.5 0.5 <500 - 1300           645.5 646.5 1.0 <500 - 1200           646.5 647.0 0.5 <500 - 600           647.0 647.5 0.5 <500           647.5 648.0 0.5 <500 - 2200           648.0 648.5 0.5 <500 - 1000           648.5 649.0 0.5 <500 - 8000           649.0 649.5 0.5 3000 - 10000           649.5 650.0 0.5 3000 - 22000           650.0 650.5 0.5 <500 - 7000           650.5 653.0 2.5 <500           653.0 653.5 0.5 <500 - 900           653.5 654.0 0.5 <500           654.0 655.0 1.0 600 - 12000           655.0 655.5 0.5 500 - 7000           655.5 656.0 0.5 500 - 1600           656.0 656.5 0.5 <500 - 2200           656.5 657.0 0.5 <500 - 800           657.0 657.5 0.5 <500 - 700           657.5 658.0 0.5 <500           658.0 658.5 0.5 <500 - 600           658.5 659.0 0.5 <500 - 900           659.0 660.0 1.0 <500           660.0 660.5 0.5 <500 - 1100           660.5 661.0 0.5 <500 - 800           661.0 661.5 0.5 <500 - 1300           661.5 662.0 0.5 <500           662.0 662.5 0.5 <500 - 1000           662.5 663.0 0.5 <500 - 9500           663.0 663.5 0.5 <500 - 650           663.5 665.5 2.0 <500           665.5 666.0 0.5 <500 - 2200           666.0 666.5 0.5 <500 - 1500           670.5 671.0 0.5 <500 - 18300           671.0 671.5 0.5 <500 - 6100           671.5 672.0 0.5 570 - 32400           672.0 672.5 0.5 <500 - 4100           672.5 673.0 0.5 <500 - 7100           673.0 673.5 0.5 <500 - 3800           674.0 674.5 0.5 <500 - 530           674.5 675.0 0.5 <500 - 650           675.5 676.0 0.5 <500 - 900           676.0 676.5 0.5 <500           677.0 677.5 0.5 <500           678.5 679.5 1.0 <500           679.5 680.0 0.5 <500 - 22800           680.0 680.5 0.5 10000 - 42300           680.5 681.0 0.5 2000 - 30000           681.0 681.5 0.5 <500 - 1300           681.5 682.5 1.0 <500           682.5 683.0 0.5 <500 - 2900           683.0 683.5 0.5 <500 - 10400           683.5 684.0 0.5 <500 - 8000           684.0 684.5 0.5 <500           685.5 686.0 0.5 <500 - 1000           688.5 689.0 0.5 <500 - 4400           689.0 689.5 0.5 <500 - 1700           691.0 692.0 1.0 <500           692.5 693.0 0.5 <500 - 1700           695.0 695.5 0.5 <500           696.5 697.0 0.5 <500           698.5 699.0 0.5 <500 - 1600           700.0 700.5 0.5 <500 - 1100           700.5 701.0 0.5 <500 - 2100           701.0 701.5 0.5 <500 - 1500           701.5 702.5 1.0 <500 - 1700           703.0 703.5 0.5 <500 - 1900           706.0 706.5 0.5 <500           709.0 709.5 0.5 <500 - 800           709.5 710.0 0.5 <500           710.5 711.0 0.5 <500 - 1400           711.0 711.5 0.5 <500 - 1700           712.0 713.0 1.0 <500           714.0 715.0 1.0 <500 - 900           715.5 716.0 0.5 <500 - 1000           716.0 716.5 0.5 <500           718.5 719.0 0.5 <500           720.0 720.5 0.5 <500 - 3400           720.5 721.0 0.5 <500 - 1900           721.0 721.5 0.5 <500 - 1400           721.5 722.0 0.5 <500           723.0 723.5 0.5 <500 - 550 RK-26-273 295 -66 390.0 131.5 267.0 267.5 0.5 <500 - 800 RK-26-274 280 -75 546.0 119.9 417.0 418.0 1.0 <500           418.5 419.0 0.5 <500           419.0 419.5 0.5 <500 - 530           419.5 420.0 0.5 <500 - 2300           420.0 420.5 0.5 <500 - 660           420.5 421.5 1.0 <500           430.0 430.5 0.5 <500           431.5 432.5 1.0 <500           433.0 433.5 0.5 <500           435.5 436.0 0.5 <500           437.5 438.0 0.5 <500 - 1050           438.0 438.5 0.5 1000 - 13000           438.5 439.0 0.5 <500 - 2350           441.5 442.0 0.5 <500 - 950           442.0 442.5 0.5 700 - 1800           442.5 443.0 0.5 800 - 2000           443.0 443.5 0.5 800 - 1400           443.5 444.0 0.5 630 - 4900           444.0 444.5 0.5 3800 - 10000           444.5 445.0 0.5 800 - 4900           445.0 447.5 2.5 <500           447.5 448.0 0.5 <500 - 1000           448.0 448.5 0.5 <500 - 770           452.0 452.5 0.5 <500 - 590           453.0 454.0 1.0 <500           454.0 454.5 0.5 <500 - 780           454.5 455.0 0.5 <500 - 560           455.0 456.0 1.0 <500           456.0 456.5 0.5 600 - 1100           456.5 457.0 0.5 <500 - 1500           457.0 457.5 0.5 700 - 1200           457.5 458.0 0.5 <500 - 700           458.0 459.0 1.0 <500           459.0 459.5 0.5 640 - 1700           459.5 460.0 0.5 <500           468.0 468.5 0.5 <500 - 900           468.5 469.0 0.5 <500 - 1400           469.0 469.5 0.5 <500           470.0 470.5 0.5 <500 - 510           470.5 471.0 0.5 <500           473.5 475.0 1.5 <500           475.0 475.5 0.5 <500 - 510           475.5 476.0 0.5 <500 - 700           476.0 476.5 0.5 <500           476.5 477.0 0.5 <500 - 2700           479.5 480.0 0.5 550 - 1100           480.0 480.5 0.5 700 - 2900           480.5 481.0 0.5 <500 - 11700           481.0 481.5 0.5 <500           482.5 483.0 0.5 <500 - 600           490.5 491.0 0.5 <500 - 930           491.0 491.5 0.5 <500 - 880           491.5 492.0 0.5 <500 - 690           541.5 542.0 0.5 <500 - 6500 RK-26-275 310 -70 519.0 93.9 No Significant Intersections RK-26-276 276 -69 810.0 112.7 662.5 663.5 1.0 <500           663.5 664.0 0.5 <500 - 4000           664.0 664.5 0.5 620 - 2200           664.5 665.0 0.5 <500 - 560           667.5 669.5 2.0 <500           669.5 670.0 0.5 <500 - 700           670.0 670.5 0.5 <500 - 1700           670.5 671.0 0.5 1500 - 4300           671.0 671.5 0.5 800 - 1400           671.5 671.9 0.4 3000 - 3300           671.9 672.0 0.2 >61000           672.0 672.2 0.2 6000 - 53000           672.2 672.5 0.3 >61000           672.5 673.0 0.5 1680 - 34000           673.0 673.5 0.5 17000 - 35000           673.5 674.0 0.5 600 - 950           674.0 674.5 0.5 <500           675.0 676.5 1.5 <500           676.5 677.0 0.5 <500 - 4050           677.0 677.5 0.5 <500 - 24000           678.5 679.0 0.5 800 - 6200           679.0 679.5 0.5 <500 - 1250           679.5 680.0 0.5 550 - 3600           680.0 680.5 0.5 1000 - 6900           680.5 681.0 0.5 1200 - 5500           681.0 681.5 0.5 750 - 1800           681.5 682.0 0.5 <500 - 1100           682.0 682.5 0.5 6000 - 14000           682.5 683.0 0.5 1300 - 5010           683.0 683.5 0.5 <500 - 2700           683.5 684.0 0.5 2080 - 18500           684.0 684.5 0.5 3050 - 26500           684.5 685.0 0.5 7200 - 15000           685.0 685.5 0.5 5500 - 18700           685.5 686.0 0.5 2500 - 26000           686.0 686.5 0.5 3500 - 30000           686.5 687.0 0.5 12000 - 15000           687.0 687.5 0.5 1300 - 15500           687.5 688.0 0.5 <500           688.0 688.5 0.5 1000 - 30000           688.5 689.0 0.5 2000 - 10000           689.0 689.5 0.5 1400 - 7500           689.5 690.0 0.5 6700 - 9000           690.0 690.5 0.5 <500           690.5 691.0 0.5 600 - 7700           691.0 691.5 0.5 <500 - 1200           691.5 692.0 0.5 590 - 9100           692.0 692.5 0.5 1100 - 21000           692.5 693.0 0.5 2700 - 44000           693.0 693.5 0.5 1400 - 7100           693.5 694.0 0.5 1000 - 38000           694.0 694.5 0.5 3700 - 31000           694.5 695.0 0.5 1100 - 14000           695.0 695.5 0.5 <500 - 4400           695.5 695.9 0.4 1100 - 14000           695.9 696.0 0.1 >61000           696.0 696.5 0.5 <500 - 700           697.0 697.5 0.5 <500           697.5 698.0 0.5 1250 - 5500           698.0 698.5 0.5 <500 - 1000           698.5 699.0 0.5 <500 - 11600           699.0 699.5 0.5 <500 - 2650           699.5 700.0 0.5 <500 - 3100           700.0 700.5 0.5 <500 - 3220           702.5 703.0 0.5 <500 - 2300           705.0 705.5 0.5 <500           705.5 706.0 0.5 <500 - 1100           709.0 709.5 0.5 <500 - 3800           709.5 710.0 0.5 <500 - 9800           710.0 710.5 0.5 <500 - 4400 RK-26-276c1 276 -69 814.0 - 678.5 679.0 0.5 <500           683.0 683.5 0.5 <500           683.5 684.0 0.5 <500 - 580           684.0 684.5 0.5 <500           684.5 685.0 0.5 <500 - 1320           685.0 685.5 0.5 <500 - 3150           685.5 686.0 0.5 570 - 1890           686.0 686.5 0.5 1400 - 7550           686.5 687.0 0.5 500 - 4500           687.0 687.5 0.5 <500 - 730           687.5 688.0 0.5 <500 - 510           688.0 688.5 0.5 1050 - 10000           688.5 689.0 0.5 1480 - 4000           689.0 689.5 0.5 740 - 12000           689.5 690.0 0.5 <500 - 4960           690.0 690.5 0.5 1250 - 13300           690.5 691.0 0.5 <500 - 780           691.0 691.5 0.5 <500 - 650           694.5 695.0 0.5 <500 - 800           695.5 696.0 0.5 <500 - 760           697.0 697.5 0.5 <500           699.5 700.0 0.5 <500 - 1220           700.5 701.0 0.5 <500 - 4100           701.0 701.5 0.5 <500 - 1780           701.5 702.0 0.5 <500 - 1000           702.0 702.5 0.5 <500           702.5 703.0 0.5 <500 - 2720           706.0 706.5 0.5 <500 - 1340           706.5 707.0 0.5 <500           707.0 707.5 0.5 <500 - 1780           707.5 708.0 0.5 <500           711.5 712.0 0.5 <500 - 2450           713.5 714.0 0.5 <500 - 3500           714.0 714.5 0.5 <500 - 1050           714.5 715.0 0.5 <500 - 850           715.0 715.5 0.5 620 - 8300           716.0 716.5 0.5 <500 - 8450           722.5 723.0 0.5 <500 - 580           724.0 724.5 0.5 <500           724.5 725.0 0.5 <500 - 650           725.0 725.5 0.5 <500 - 1280           725.5 726.0 0.5 <500 - 1600           726.5 727 0.5 <500 - 840           727.0 727.5 0.5 <500 - 1020           727.5 728 0.5 <500 - 560           728.0 728.5 0.5 <500 - 540           728.5 729 0.5 <500           729.5 730 0.5 <500 - 640           732.0 732.5 0.5 <500 - 700           732.5 733 0.5 <500 - 680           733.0 733.5 0.5 <500           740.5 741 0.5 <500           741.0 741.5 0.5 <500 - 580           741.5 742 0.5 <500 - 750           742.5 743 0.5 <500           746.5 747 0.5 620 - 1400           747.0 747.5 0.5 680 - 1400           747.5 748 0.5 1100 - 5000           748.0 748.5 0.5 <500 - 810           749.0 749.5 0.5 <500           751.5 752.5 1.0 <500           754.0 754.5 0.5 <500           755.0 756.5 1.5 <500           757.0 757.5 0.5 <500 - 700           757.5 758 0.5 <500 - 780           758.0 758.5 0.5 600 - 1700           758.5 759 0.5 520 - 1100           760.5 761 0.5 <500           763.0 763.5 0.5 <500 - 700           764.5 765 0.5 <500           766.5 767 0.5 <500 - 720           767.0 767.5 0.5 <500           767.5 768 0.5 <500 - 1650           783.0 783.5 0.5 <500           787.0 788 1.0 <500           805.0 805.5 0.5 <500 RK-26-276c2 276 -69 864.0 - 731.0 731.5 0.5 <500 - 47400           785.5 786.0 0.5 530 - 1350           786.0 786.5 0.5 <500 - 1700           786.5 787.0 0.5 <500 - 950           787.0 787.5 0.5 <500           789.5 790.0 0.5 <500           798.0 798.5 0.5 <500           798.5 799.0 0.5 <500 - 700           808.0 808.5 0.5 <500 - 650           810.5 811.0 0.5 <500 - 720           811.0 811.5 0.5 <500 - 940           812.5 813.0 0.5 <500           813.0 813.5 0.5 <500 - 740 RK-26-277 290 -70 525.0 - No Significant Intersections RK-26-278 270 -70 648.2 117.9 513 513.5 0.5 <500           513.5 514 0.5 <500 - 600           514 514.5 0.5 <500 - 520           514.5 522.5 8.0 <500           522.5 523 0.5 <500 - 510           523 523.5 0.5 <500 - 510           523.5 524 0.5 500 - 3000           524 538 14.0 <500           538 538.5 0.5 <500 - 570           538.5 554.5 16.0 <500           554.5 555 0.5 <500 - 520           555 555.5 0.5 <500 - 520           555.5 558.5 3.0 <500           558.5 559 0.5 <500 - 530           559 564.5 5.5 <500           574 575 1.0 <500           577.5 578 0.5 <500           578 578.5 0.5 <500 - 610           578.5 579 0.5 <500 - 750           579 579.5 0.5 <500 - 530           579.5 580 0.5 <500 - 1000           580 580.5 0.5 <500 - 1080           580.5 581 0.5 850 - 1900           581 582 1.0 <500           582 582.5 0.5 <500 - 710           582.5 583 0.5 <500 - 950           583 583.5 0.5 530 - 750           583.5 585 1.5 <500           585.5 586 0.5 <500           586.5 587 0.5 <500           587 587.5 0.5 <500 - 800           587.5 588 0.5 <500 - 1020           588 589.5 1.5 <500           589.5 590 0.5 <500 - 1450           590 590.5 0.5 <500           592.5 594 1.5 <500 RK-26-279 290 -70 569.5 - No Significant Intersections RK-26-280 270 -69 951 108.8 881.5 882.0 0.5 <500 - 13400           882.0 882.5 0.5 <500 - 2500           901.5 902.5 1.0 <500           902.5 903.0 0.5 <500 - 570           903.0 903.5 0.5 <500 - 1080           904.0 904.5 0.5 <500 - 670           904.5 905.0 0.5 <500 - 570           905.0 905.5 0.5 <500 - 1100           905.5 906.0 0.5 <500           906.0 906.5 0.5 <500 - 11100           906.5 907.0 0.5 <500 - 50600           908.5 909.0 0.5 <500 - 1200           909.0 909.5 0.5 <500 - 920           909.5 910.0 0.5 <500 - 640           910.5 911.0 0.5 <500           912.0 913.0 1.0 <500 RK-26-280c1 270 -70 1020 - 877.0 877.3 0.3 <500 - 750           877.3 877.4 0.1 >61000           877.4 877.5 0.1 4000 - 59000           877.5 877.7 0.2 700 - 14300           877.7 877.8 0.1 >61000           877.8 878.0 0.2 3200 - 53600           878.0 878.5 0.5 <500 - 4600           878.5 879.0 0.5 <500           879.0 879.5 0.5 <500 - 920           879.5 880.0 0.5 <500           880.0 880.5 0.5 <500 - 640           881.5 882.0 0.5 <500 - 2600           882.0 883.0 1.0 <500           883.0 883.5 0.5 1300 - 43400           883.5 883.7 0.2 1500 - 60400           883.7 884.0 0.3 >61000           884.0 884.5 0.5 2900 - 22400           884.5 885.0 0.5 <500 - 1100           885.0 885.5 0.5 <500 - 6400           885.5 886.0 0.5 <500 - 8500           886.5 887.0 0.5 <500 - 8700           887.0 887.5 0.5 <500 - 10700           889.0 889.5 0.5 <500 - 5100           890.0 890.5 0.5 <500           890.5 891.0 0.5 <500 - 970           891.0 891.5 0.5 <500 - 850           892.5 893.0 0.5 <500 - 900           893.0 893.5 0.5 <500 - 870           893.5 894.0 0.5 <500           896.5 897.0 0.5 <500 - 580           897.0 897.5 0.5 <500 - 720           897.5 898.0 0.5 <500           898.0 898.5 0.5 <500 - 750           898.5 899.0 0.5 <500 - 2800           899.0 899.5 0.5 <500 - 550           899.5 900.0 0.5 <500 - 2600           900.0 900.5 0.5 <500 - 850           900.5 901.0 0.5 <500 - 1150           901.0 901.5 0.5 500 - 2700           901.5 902.0 0.5 550 - 3400           902.5 903.0 0.5 <500           903.0 903.5 0.5 <500 - 700           903.5 904.0 0.5 <500 - 670           904.0 904.5 0.5 800 - 8700           904.5 905.0 0.5 1100 - 20500           905.0 905.5 0.5 600 - 15700           905.5 906.0 0.5 <500 - 3500           906.0 906.5 0.5 <500           906.5 906.8 0.3 9600 - 44700           906.8 906.9 0.1 >61000           906.9 907.0 0.1 13000 - 59000           907.0 907.5 0.5 <500 - 8400           907.5 908.0 0.5 550 - 1750           908.0 908.5 0.5 <500 - 1300           919.0 919.5 0.5 <500 - 3700           923.0 923.5 0.5 <500 - 900           925.0 925.5 0.5 <500 - 980           925.5 926.0 0.5 650 - 8800           936.5 937.0 0.5 <500 - 3100 RK-26-281 272 -70 539 117.7 492.5 493.0 0.5 <500 - 510           494.0 495.0 1.0 <500           516.0 516.5 0.5 <500 - 550           516.5 517.0 0.5 <500           517.0 517.5 0.5 <500 - 550           517.5 518.0 0.5 <500           518.5 519.0 0.5 <500 - 690           519.0 519.5 0.5 <500 - 7200           519.5 520.0 0.5 980 - 6600           520.0 520.5 0.5 <500 - 2100           520.5 521.0 0.5 <500 - 660           521.0 522.5 1.5 <500           522.5 523.0 0.5 <500 - 6000           523.0 523.5 0.5 <500           523.5 524.0 0.5 <500 - 1400           524.0 524.5 0.5 <500 - 560           524.5 525.0 0.5 <500 - 1700           525.0 525.5 0.5 <500 - 580           525.5 526.0 0.5 <500 - 970           526.0 526.5 0.5 <500           526.5 527.0 0.5 <500 - 2100           527.0 527.5 0.5 870 - 2200           527.5 528.0 0.5 970 - 1800           528.0 528.5 0.5 500 - 1940           528.5 529.0 0.5 <500 - 1400           529.0 529.5 0.5 550 - 2900           529.5 530.0 0.5 <500           530.5 531.0 0.5 <500 - 660           531.0 531.5 0.5 <500 - 670           531.5 532.0 0.5 <500 - 810           532.0 532.5 0.5 <500           532.5 533.0 0.5 <500 - 1600           533.5 534.0 0.5 <500           534.0 534.5 0.5 <500 - 970           534.5 535.0 0.5 <500           536.0 537.5 1.5 <500           578.0 578.5 0.5 <500 - 550           578.5 579.0 0.5 <500 RK-26-282 290 -70 609 92.5 No Significant Intersections RK-26-283 270 -70 708.8 113.2 566.5 567.0 0.5 <500 - 620           567.0 567.5 0.5 <500           572.0 572.5 0.5 <500           573.5 574.0 0.5 <500           574.0 574.5 0.5 <500 - 760           575.0 576.0 1.0 <500           577.0 577.5 0.5 <500 - 520           577.5 578.0 0.5 <500 - 1200           581.5 582.0 0.5 <500           582.0 582.5 0.5 <500 - 1630           582.5 583.0 0.5 520 - 1420           583.0 583.5 0.5 500 - 1650           583.5 584.0 0.5 <500 - 2300           584.5 585.0 0.5 <500 - 650           585.0 587.0 2.0 <500           588.0 588.5 0.5 <500 - 670           588.5 589.0 0.5 <500 - 610           589.0 589.5 0.5 <500 - 1520           589.5 590.0 0.5 <500           590.0 590.5 0.5 840 - 2760           590.5 591.0 0.5 <500 - 1150           591.0 591.5 0.5 <500           591.5 592.0 0.5 <500 - 1570           592.0 592.5 0.5 <500 - 1170           592.5 593.0 0.5 540 - 2200           593.0 593.5 0.5 <500 - 630           593.5 594.0 0.5 510 - 1150           594.0 594.5 0.5 750 - 5400           594.5 595.0 0.5 630 - 3130           595.0 595.5 0.5 1350 - 31200           595.5 596.0 0.5 <500 - 2400           596.0 596.5 0.5 750 - 5000           596.5 597.5 1.0 <500           597.5 598.0 0.5 <500 - 1670           598.0 598.5 0.5 1560 - 2100           598.5 599.0 0.5 620 - 3200           599.0 599.5 0.5 <500 - 590           600.0 600.5 0.5 <500           600.5 601.0 0.5 <500 - 520           601.0 603.5 2.5 <500           603.5 604.0 0.5 <500 - 700           604.5 605.0 0.5 700 - 1510           605.0 605.5 0.5 <500 - 21000           605.5 606.0 0.5 <500 - 630           606.0 606.5 0.5 <500 - 1200           606.5 607.0 0.5 <500 - 900           607.0 607.5 0.5 <500           607.5 608.0 0.5 <500 - 600           608.0 608.5 0.5 <500 - 740           615.0 615.5 0.5 <500           615.5 616.0 0.5 <500 - 700           616.0 616.5 0.5 630 - 1480           616.5 617.0 0.5 <500 - 620           617.0 617.5 0.5 <500 - 610           617.5 618.0 0.5 <500 - 950           618.0 618.5 0.5 630 - 1840           618.5 619.0 0.5 <500 - 640           619.0 619.5 0.5 <500 - 570           619.5 620.0 0.5 <500 - 680           620.0 620.5 0.5 <500 - 570           620.5 621.0 0.5 <500           621.0 621.5 0.5 <500 - 750           621.5 622.0 0.5 <500 - 800           622.0 622.5 0.5 <500 - 710           622.5 623.0 0.5 <500 - 1190           623.0 623.5 0.5 <500           624.0 625.5 1.5 <500           626.5 628.0 1.5 <500           628.5 629.0 0.5 <500           629.0 629.5 0.5 <500 - 850           629.5 630.0 0.5 1300 - 3160           630.0 630.5 0.5 <500           630.5 631.0 0.5 <500 - 1720           631.0 631.5 0.5 <500 - 510           631.5 631.6 0.1 3000 - 4500           631.6 631.7 0.1 44000 - 60000           631.7 631.8 0.1 >61000           631.8 631.9 0.1 800 - 37000           631.9 632.0 0.1 900 - 2100           632.0 632.5 0.5 <500           634.5 635.0 0.5 <500           639.5 640.0 0.5 <500 - 820           640.0 640.5 0.5 1760 - 13300           670.0 670.5 0.5 <500 - 2980           670.5 671.0 0.5 1080 - 6700           671.0 671.5 0.5 860 - 9900           672.0 672.5 0.5 <500           681.0 681.5 0.5 <500 - 1700           681.5 682.0 0.5 <500 - 1300           691.0 691.5 0.5 <500 - 3500           691.5 692.0 0.5 <500           696.0 696.5 0.5 <500 - 700 RK-26-284 270 -70 558 111.5 No Significant Intersections RK-26-285 275 -72 831 111.0 689.0 689.5 0.5 <500           689.5 690.0 0.5 <500 - 950           690.0 690.5 0.5 <500 - 680           690.5 691.0 0.5 930 - 2100           691.0 691.5 0.5 <500 - 1300           691.5 692.0 0.5 930 - 1600           692.0 692.5 0.5 <500 - 570           692.5 693.5 1.0 <500           693.5 694.0 0.5 <500 - 900           694.0 694.5 0.5 <500 - 600           697.5 698.0 0.5 <500           699.5 700.0 0.5 <500 - 1300           701.5 702.0 0.5 1100 - 31000           702.0 702.5 0.5 6000 - 23000           702.5 703.0 0.5 500 - 11900           703.0 703.5 0.5 700 - 8600           703.5 704.0 0.5 <500 - 3500           704.0 704.5 0.5 1800 - 49800           704.5 705.0 0.5 2200 - 30600           705.0 705.2 0.2 >61000           705.2 705.5 0.3 1300 - 38900           705.5 706.0 0.5 7500 - 31000           706.0 706.5 0.5 1300 - 3000           706.5 707.0 0.5 700 - 1300           707.0 707.5 0.5 2800 - 21800           707.5 708.0 0.5 2400 - 2900           708.0 708.5 0.5 <500 - 610           708.5 709.0 0.5 >61000           709.0 709.5 0.5 3000 - 14100           709.5 710.0 0.5 7500 - 41600           710.0 710.5 0.5 1400 - 26800           710.5 711.0 0.5 16100 - 21900           711.0 711.5 0.5 <500 - 630           711.5 712.5 1.0 <500           712.5 713.0 0.5 <500 - 530           716.5 717.0 0.5 800 - 25800           717.5 718.0 0.5 1100 - 6600           718.0 718.5 0.5 1800 - 5300           718.5 719.0 0.5 4500 - 12000           721.0 721.5 0.5 4700 - 25900           722.0 722.5 0.5 <500 - 2650           723.0 723.5 0.5 <500 - 1880           723.5 724.0 0.5 1400 - 3300           724.5 725.0 0.5 1100 - 14800           725.0 725.5 0.5 <500 - 1800           727.5 728.0 0.5 <500 - 1300           729.0 729.5 0.5 <500 - 8100           729.5 730.0 0.5 4100 - 32100           730.0 730.5 0.5 <500           730.5 731.0 0.5 <500 - 510           731.0 731.5 0.5 <500 - 5150           731.5 732.0 0.5 <500 - 1300           732.0 732.5 0.5 <500 - 1700           732.5 733.0 0.5 <500 - 2200           733.0 733.5 0.5 4100 - 6100           736.0 736.5 0.5 <500           739.5 740.0 0.5 <500 - 630           742.5 743.0 0.5 <500 - 570           743.5 744.0 0.5 <500           745.0 745.5 0.5 <500 - 1500           745.5 746.0 0.5 <500 - 1080           752.0 752.5 0.5 <500 - 670           752.5 753.0 0.5 <500           753.0 753.5 0.5 770 - 1900           753.5 754.0 0.5 <500 - 790           754.0 754.5 0.5 <500 - 770           754.5 755.0 0.5 <500 - 590           757.0 757.5 0.5 <500 - 520           757.5 758.5 1.0 <500           760.0 760.5 0.5 <500 - 790           760.5 761.0 0.5 <500 - 780           761.5 762.0 0.5 <500 - 580           763.0 763.5 0.5 <500 - 540           763.5 764.0 0.5 600 - 930           764.0 764.5 0.5 <500           765.0 765.5 0.5 <500 - 550           765.5 766.0 0.5 630 - 1300           766.0 766.5 0.5 880 - 3700           766.5 767.0 0.5 <500 - 1500           767.5 768.0 0.5 1600 - 2900           768.0 768.5 0.5 <500 - 630           768.5 769.0 0.5 <500 - 1700           771.5 772.0 0.5 <500 - 570           772.0 772.5 0.5 <500 - 1600           773.5 774.0 0.5 <500           776.5 777.0 0.5 <500 - 1500 RK-26-286 300 -70 624 108.1 No Significant Intersections RK-26-287 288 -70.5 513 122.7 369.5 370.0 0.5 <500           390.0 391.0 1.0 <500           394.0 395.0 1.0 <500           395.5 398.0 2.5 <500           399.0 401.0 2.0 <500           401.5 402.0 0.5 <500           403.5 404.0 0.5 <500           406.5 407.0 0.5 <500           407.0 407.5 0.5 <500 - 950           407.5 408.0 0.5 <500 - 700           408.0 408.5 0.5 <500           408.5 409.0 0.5 <500 - 650           410.5 411.0 0.5 <500           411.0 411.5 0.5 <500 - 2200           411.5 412.0 0.5 <500 - 1400           412.0 412.5 0.5 <500 - 1700           412.5 413.0 0.5 <500 - 540           414.0 415.0 1.0 <500 - 600           416.0 416.5 0.5 <500           417.0 417.5 0.5 <500 - 800           418.0 418.5 0.5 <500           436.5 437.0 0.5 <500           437.0 437.5 0.5 <500 - 800           437.5 438.0 0.5 <500 - 660           438.0 438.5 0.5 <500 - 740           439.5 440.0 0.5 <500           440.5 441.0 0.5 <500 - 740           441.0 441.5 0.5 620 - 1400           441.5 442.0 0.5 520 - 1600           442.0 442.5 0.5 <500 - 780           446.5 447.0 0.5 <500           452.5 453.0 0.5 <500 - 640           453.0 454.5 1.5 <500           454.5 455.0 0.5 <500 - 690           455.0 455.5 0.5 <500 All depths and intervals are meters downhole, true thicknesses are yet to be determined. "Off-scale" refers to >61,000 cps (counts per second) readings by gamma spectrometer type RS-125. "Anomalous" means >500 cps readings by gamma spectrometer type RS-120. Where "CPS Range" is <500 cps, this refers to local low radioactivity within the overall interval. Unconformity of 'N/A' denotes a lack of visible contact between Athabasca sandstone and basement rock. Maximum internal dilution 2.0 m downhole. 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 determined. About NexGen NexGen Energy is a Canadian company focused on delivering clean energy fuel for the future. The Company's flagship Rook I Project is being optimally developed into the largest low-cost producing uranium mine globally, incorporating the most elite environmental and social governance standards. The Rook I Project is supported by an N.I. 43-101 compliant Feasibility Study, which outlines the elite environmental performance and industry-leading economics. NexGen is led by a team of experienced uranium and mining industry professionals with expertise across the entire mining life cycle, including exploration, financing, project engineering and construction, operations and closure. NexGen is leveraging its proven experience to deliver a Project that leads the entire mining industry socially, technically and environmentally. The Project and prospective portfolio in northern Saskatchewan will provide generational, long-term economic, environmental, and social benefits for Saskatchewan, Canada, and the world. NexGen is listed on the Toronto Stock Exchange, the New York Stock Exchange under the ticker symbol "NXE," and on the Australian Securities Exchange under the ticker symbol "NXG," providing access to global investors to participate in NexGen's mission of solving three major global challenges in decarbonization, energy security and access to power. The Company is headquartered in Vancouver, British Columbia, with its primary operations office in Saskatoon, Saskatchewan. Contact Information Leigh Curyer Chief Executive Officer NexGen Energy Ltd. +1 604 428 4112 [email protected] www.nexgenenergy.ca Travis McPherson Chief Commercial Officer NexGen Energy Ltd. +1 604 428 4112 [email protected] www.nexgenenergy.ca Monica Kras Vice President, Corporate Development NexGen Energy Ltd. +44 7307 191933 [email protected] www.nexgenenergy.ca Technical Disclosure* All technical information in this news release has been reviewed and approved by Jason Craven, NexGen's Vice President, Exploration, a qualified person under National Instrument 43-101. Natural gamma radiation in drill core reported in this news release was measured in counts per second (cps) using a Radiation Solutions Inc. RS-125 gamma spectrometer. The reader is cautioned that total count gamma readings may not be directly or uniformly related to uranium grades of the rock sample measured; they should be used only as a preliminary indication of the presence of radioactive minerals. A technical report in respect of the FS is filed on SEDAR+ ( www.sedarplus.ca ) and EDGAR ( www.sec.gov/edgar.shtml ) and is available for review on NexGen Energy's website ( www.nexgenenergy.ca ). Cautionary Note to U.S. Investors This news release includes Mineral Reserves and Mineral Resources classification terms that comply with reporting standards in Canada and the Mineral Reserves and the Mineral Resources estimates are made in accordance with NI 43-101. NI 43-101 is a rule developed by the Canadian Securities Administrators that establishes standards for all public disclosure an issuer makes of scientific and technical information concerning mineral projects. These standards differ from the requirements of the Securities and Exchange Commission ("SEC") set by the SEC's rules that are applicable to domestic United States reporting companies. Consequently, Mineral Reserves and Mineral Resources information included in this news release is not comparable to similar information that would generally be disclosed by domestic U.S. reporting companies subject to the reporting and disclosure requirements of the SEC Accordingly, information concerning mineral deposits set forth herein may not be comparable with information made public by companies that report in accordance with U.S. standards. Forward-Looking Information The information contained herein contains "forward-looking statements" within the meaning of applicable United States securities laws and regulations and "forward-looking information" within the meaning of applicable Canadian securities legislation. "Forward-looking information" includes, but is not limited to, statements with respect to mineral reserve and mineral resource estimates, the 2021 Arrow Deposit, Rook I Project and estimates of uranium production, grade and long-term average uranium prices, anticipated effects of completed drill results on the Rook I Project, planned work programs, completion of further site investigations and engineering work to support basic engineering of the project and expected outcomes. Generally, but not always, forward-looking information and statements can be identified by the use of words such as "plans", "expects", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates", or "believes" or the negative connotation thereof or variations of such words and phrases or state that certain actions, events or results "may", "could", "would", "might" or "will be taken", "occur" or "be achieved" or the negative connotation thereof. Statements relating to "mineral resources" are deemed to be forward-looking information, as they involve the implied assessment that, based on certain estimates and assumptions, the mineral resources described can be profitably produced in the future. Forward-looking information and statements are based on the then current expectations, beliefs, assumptions, estimates and forecasts about NexGen's business and the industry and markets in which it operates. Forward-looking information and statements are made based upon numerous assumptions, including among others, that the mineral reserve and resources estimates and the key assumptions and parameters on which such estimates are based are as set out in this news release and the technical report for the property , the results of planned exploration activities are as anticipated, the price and market supply of uranium, the cost of planned exploration activities, that financing will be available if and when needed and on reasonable terms, that third party contractors, equipment, supplies and governmental and other approvals required to conduct NexGen's planned exploration activities will be available on reasonable terms and in a timely manner and that general business and economic conditions will not change in a material adverse manner. Although the assumptions made by the Company in providing forward looking information or making forward looking statements are considered reasonable by management at the time, there can be no assurance that such assumptions will prove to be accurate in the future. Forward-looking information and statements also involve known and unknown risks and uncertainties and other factors, which may cause actual results, performances and achievements of NexGen to differ materially from any projections of results, performances and achievements of NexGen expressed or implied by such forward-looking information or statements, including, among others, the existence of negative operating cash flow and dependence on third party financing, uncertainty of the availability of additional financing, the risk that pending assay results will not confirm previously announced preliminary results, conclusions of economic valuations, the risk that actual results of exploration activities will be different than anticipated, the cost of labour, equipment or materials will increase more than expected, that the future price of uranium will decline or otherwise not rise to an economic level, the appeal of alternate sources of energy to uranium-produced energy, that the Canadian dollar will strengthen against the U.S. dollar, that mineral resources and reserves are not as estimated, that actual costs or actual results of reclamation activities are greater than expected, that changes in project parameters and plans continue to be refined and may result in increased costs, of unexpected variations in mineral resources and reserves, grade or recovery rates or other risks generally associated with mining, unanticipated delays in obtaining governmental, regulatory or First Nations approvals, risks related to First Nations title and consultation, reliance upon key management and other personnel, deficiencies in the Company's title to its properties, uninsurable risks, failure to manage conflicts of interest, failure to obtain or maintain required permits and licences, risks related to changes in laws, regulations, policy and public perception, as well as those factors or other risks as more fully described in NexGen's Annual Information Form dated March 6, 2024 filed with the securities commissions of all of the provinces of Canada except Quebec and in NexGen's 40-F filed with the United States Securities and Exchange Commission, which are available on SEDAR+ at www.sedarplus.ca  and Edgar at www.sec.gov . Although the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in the forward-looking information or statements or implied by forward-looking information or statements, there may be other factors that cause results not to be as anticipated, estimated or intended. Readers are cautioned not to place undue reliance on forward-looking information or statements due to the inherent uncertainty thereof. There can be no assurance that forward-looking information and statements will prove to be accurate, as actual results and future events could differ materially from those anticipated, estimated or intended. Accordingly, readers should not place undue reliance on forward-looking statements or information. The Company undertakes no obligation to update or reissue forward-looking information as a result of new information or events except as required by applicable securities laws .

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