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

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% U3O8) 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% U3O8) 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 To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/1745/293775_f571136e943028da_002full.jpg 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 To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/1745/293775_f571136e943028da_003full.jpg Figure 3: Core photo from RK-25-280c1 displays semi-massive, off-scale (>61,000 cps) from uranium vein at 834m down hole To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/1745/293775_f571136e943028da_004full.jpg 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 To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/1745/293775_f571136e943028da_005full.jpg Figure 5: Map of PCE with completed 2026 drill holes; ground gravity in background, interpreted fault shown as black dashed line To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/1745/293775_f571136e943028da_006full.jpg 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. To view the source version of this press release, please visit https://www.newsfilecorp.com/release/293775