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NexGen Announces Best Hole to Date (RK-24-222) and High-Grade Expansion at Patterson Corridor East Concluding a Successful 2024 Drilling Program

Press Release

    • NexGen’s 2024 exploration campaign delivered a new discovery on Rook I at Patterson Corridor East (“PCE”) 3.5km east of Arrow.
    • Subsequent drilling has materially expanded the mineralized zone to 600 m strike length and 600 m vertical extent with 19 of 30 holes intersecting mineralization including 10 holes with multiple intervals >10,000 cps.
    • Today’s announcement highlights the best hole to date at PCE (RK-24-222) returns 17.0 m wide vein with multiple high intensity (>61,000 cps) occurrences.
    • In 2024, PCE is the largest drill program in the Athabasca Basin by any Company at 34,000 meters (m).

VANCOUVER, BC, Nov. 12, 2024 – NexGen Energy Ltd. (“NexGen” or the “Company”) (TSX: NXE) (NYSE: NXE) (ASX: NXG) is proud to announce the completion of its 2024 drilling campaign at Patterson Corridor East (PCE) that included more than 34,000 m across a total of 46 drillholes. Upon initial discovery of intense uranium mineralization at PCE (see March 11 News Release), the Company directed all drilling activity to focus exclusively on PCE, whereby 19 of 30 holes intersected mineralization. Bold and systematic spacing of drillhole intercepts have quickly grown the discovery from a single hole to a broad and continuous new uranium discovery. Real-time evaluation of results throughout the duration of the program focused on determining the overall outer extents of the mineralized zone and in parallel, precisely targeting high-grade sub-domains (Figures 1 and 2, Table 1).

In late October, a high-grade portion has presented itself within the overall mineralized zone with upgraded intensity of mineralization in the now best hole to date, RK-24-222 (Figure 3). A 17.0 m wide vein with multiple occurrences of off-scale (>61,000 cps) mineralization (Table1, Figure 3). In addition, RK-24-220 and -223 intersected strong mineralization up to 41,000 cps and 40,000 cps, respectively including multiple intercepts of >10,000 cps.  System strength is confirmed by these zones characterized by semi-massive to massive replacement by uraninite. A high-grade sub-domain of the mineralized footprint now covers 100 m of strike and 170 m of depth extent with potential growth in all directions (Figure 2). The high-grade intersection in RK-24-222 represents the fifth drillhole at PCE to return off-scale (>61,000 cps) mineralization, joining previous significant intersections in RK-24-183, -197, -202, and -207.

Leigh Curyer, Chief Executive Officer, commented: “This focused effort has elevated the materiality of PCE and today’s results highlight the increasing potential of the PCE system with RK-24-222. With 600 m of strike length and 600 m of depth extent, this new zone located entirely within competent basement rock only 3.5 km from the flagship world-class Arrow deposit has emerged as a compelling and prospective addition to NexGen’s dominant portfolio in the south western section of the Athabasca Basin.

NexGen’s disciplined dual focus on the advancement of the Rook I Project and the expanded exploration at PCE demonstrates the Company’s commitment to unlocking the full potential of this major uranium district at a time where the need for clean affordable safe baseload energy has never been more evident. With the world’s leading tech companies all committing to nuclear power in recent month’s the outlook is incredibly exciting in the nuclear fuel space.”

Assays from disclosed intersections are expected in Q4 2024 and Q1 2025, with reporting to follow.  Exploration activity will resume in January 2025 with planning underway for a significant drill program at PCE where the prospectivity for material growth is clearly evident.

Figure 1: Map view of PCE target area with the mineralized footprint wireframe shown in red; as of November 11, 2024 (CNW Group/NexGen Energy Ltd.)

Figure 2: Schematic long section comparison from mid-summer 2024 to November 2024 of mineralized footprint at PCE; additional drilling has maintained internal continuity with modest expansion in most directions (CNW Group/NexGen Energy Ltd.)

Figure 3: Core photo from RK-24-222; high-grade mineralization is hosted near continuously within an overall vein width of 17.0 m from 604.5 to 621.5 m with a secondary vein below from 623.0 to 626.0 m; yellow outlines >1,000 cps while red outlines >10,000 cps (CNW Group/NexGen Energy Ltd.)

Figure 4: RK-24-222 close-up of off-scale (>61,000 cps) massive replacement by uraninite haloed by hematite at 607.4 m (CNW Group/NexGen Energy Ltd.)

Figure 5: RK-24-222 semi-massive replacement by uraninite accompanied by argillization and hematite at 618.5 m, max peak of >61,000 cps (CNW Group/NexGen Energy Ltd.)

Table 1: 2024 Spectrometer results since previous release on August 8, 2024

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-24-208 310 -70 756 104.3 435 435.5 0.5 <500
435.5 436 0.5 <500 – 710
522 522.5 0.5 <500
523 523.5 0.5 <500
655 655.5 0.5 <500 – 750
655.5 656 0.5 <500
657.5 658 0.5 <500
658.5 659 0.5 <500
665.5 666 0.5 <500
666 666.5 0.5 <500 – 610
669.5 670.5 1 <500
670.5 671 0.5 560 – 950
671 671.5 0.5 1400 – 3560
673 673.5 0.5 <500 – 690
673.5 674 0.5 500 – 1140
674 675 1 <500
680 681 1 <500
685.5 686 0.5 <500 – 600
686.5 687 0.5 600 – 800
687 687.5 0.5 900 – 3000
687.5 688 0.5 <500 – 3000
689 689.5 0.5 <500 – 500
689.5 690 0.5 1300 – 5700
690 690.5 0.5 <500 – 2400
690.5 691 0.5 <500
691.5 692 0.5 <500 – 1800
692 692.5 0.5 <500 – 1600
692.5 693 0.5 <500
693 693.5 0.5 <500 – 1300
693.5 694 0.5 <500 – 500
694 694.5 0.5 <500 – 610
694.5 695 0.5 <500 – 600
695 695.5 0.5 550 – 1500
695.5 696 0.5 <500 – 3500
696 696.5 0.5 <500 – 810
697.5 698.5 1 <500
RK-24-209 310 -70 840 110.7 395 396 1 <500
627.5 628 0.5 <500 – 510
695 695.5 0.5 <500
759 759.5 0.5 <500 – 600
RK-24-210 310 -70 1095 102.4 639 639.5 0.5 <500
639.5 640 0.5 <500 – 510
640 640.5 0.5 <500
854 854.5 0.5 <500 – 700
854.5 855 0.5 <500
855.5 856 0.5 <500 – 1600
856 856.5 0.5 <500 – 1800
857.5 858 0.5 <500
858 858.5 0.5 <500 – 1600
862 862.5 0.5 <500 – 950
863.5 864 0.5 <500 – 700
869 869.5 0.5 <500 – 600
869.5 870 0.5 <500 – 500
874.5 875 0.5 <500 – 550
875.5 876 0.5 <500 – 3800
876 876.5 0.5 2700 – 6500
876.5 877 0.5 <500 – 1100
877 879 2 <500
879 879.5 0.5 <500 – 1200
879.5 880 0.5 <500 – 700
880 880.5 0.5 <500 – 750
880.5 881 0.5 600 – 1200
881 881.5 0.5 <500 – 600
881.5 882 0.5 <500 – 900
882 882.5 0.5 <500 – 1500
882.5 883 0.5 800 – 3400
883 883.5 0.5 <500 – 520
884.5 885 0.5 <500
885.5 886 0.5 <500 – 600
886 886.5 0.5 <500 – 1100
886.5 887 0.5 <500 – 1600
888 888.5 0.5 <500
888.5 889 0.5 <500 – 900
915.5 916.5 1 <500
920 920.5 0.5 <500 – 500
921 921.5 0.5 <500 – 700
921.5 922 0.5 <500
RK-24-211 310 -70 1302 103.1 776.5 777 0.5 <500
784 784.5 0.5 <500
1116.5 1117 0.5 <500
RK-24-212 315 -70 137 121 No Significant Intersections
RK-24-213 310 -70 936 87 No Significant Intersections
RK-24-214 310 -70 989 111.6 463 463.5 0.5 <500
466.5 467 0.5 <500
859.5 860 0.5 <500
862.5 863.5 1 <500
863.5 864 0.5 <500 – 950
865 865.5 0.5 <500
865.5 866 0.5 <500 – 540
866 866.5 0.5 <500 – 1400
867.5 868 0.5 <500
868 868.5 0.5 <500 – 650
868.5 869 0.5 <500 – 2200
869.5 870 0.5 <500
RK-24-215 310 -70 840 114.8 542 542.5 0.5 600 – 1300
542.5 543 0.5 2200 – 3200
543 543.5 0.5 6000 – 11000
543.5 544 0.5 <500 – 5000
544 544.5 0.5 <500 – 700
544.5 545 0.5 600 – 3500
545 545.5 0.5 500 – 1800
545.5 546 0.5 <500 – 700
546 546.5 0.5 <500 – 1400
546.5 547 0.5 <500 – 1150
547 547.5 0.5 <500
551.5 552 0.5 <500 – 1700
552 553.5 1.5 <500
564.5 565 0.5 <500 – 700
570 570.5 0.5 <500
570.5 571 0.5 <500 – 800
571 571.5 0.5 <500
571.5 572 0.5 <500 – 600
572 572.5 0.5 <500
583.5 584 0.5 <500
584.5 585 0.5 <500
585 585.5 0.5 600 – 1500
585.5 586 0.5 <500 – 550
586 586.5 0.5 <500 – 700
586.5 587 0.5 <500 – 800
587 588 1 <500
588 588.5 0.5 600 – 2000
588.5 589 0.5 700 – 2100
589 589.5 0.5 <500 – 1300
589.5 590 0.5 1200 – 1500
590.5 591 0.5 <500
600 600.5 0.5 <500 – 500
604.5 605 0.5 <500
608.5 609 0.5 <500
609 609.5 0.5 800 – 2850
609.5 610 0.5 <500
610 610.5 0.5 <500 – 850
621.5 622 0.5 <500 – 1500
622 622.5 0.5 <500 – 700
643 643.5 0.5 <500
646 646.5 0.5 <500 – 700
646.5 647 0.5 <500 – 1300
647 647.5 0.5 <500 – 2500
647.5 648 0.5 <500 – 700
648 649 1 <500
657 657.5 0.5 <500 – 1200
658 658.5 0.5 <500 – 500
658.5 659 0.5 <500 – 500
659 659.5 0.5 <500 – 1950
665.5 666 0.5 <500 – 600
681 681.5 0.5 <500 – 900
681.5 682 0.5 <500 – 850
RK-24-216 310 -70 1071 99.7 787 787.5 0.5 <500 – 600
787.5 788 0.5 1100 – 3700
788 788.5 0.5 800 – 1200
788.5 789 0.5 <500
789.5 790 0.5 <500 – 700
790 790.5 0.5 <500 – 700
790.5 791 0.5 <500
791.5 792 0.5 <500 – 550
805 805.5 0.5 <500 – 740
805.5 806 0.5 <500
807.5 808.5 1 <500
811.5 812 0.5 <500 – 5800
815 815.5 0.5 <500 – 760
815.5 816 0.5 <500 – 700
819 820 1 <500
RK-24-217 310 -70 1185 105.6 519 520 1 <500
528.5 529 0.5 <500
709 710 1 <500
RK-24-217a 310 -70 120 105.1 No Significant Intersections
RK-24-218 310 -70 696 109.6 325.5 326 0.5 <500 – 830
424.5 425 0.5 <500 – 550
425.5 426 0.5 <500
463.5 464 0.5 <500 – 520
494.5 495 0.5 <500 – 550
515.5 516 0.5 <500
516 516.5 0.5 <500 – 700
516.5 517 0.5 <500 – 1200
517 517.5 0.5 500 – 4300
517.5 518 0.5 <500 – 1200
518 518.5 0.5 1000 – 2000
518.5 519 0.5 <500 – 1000
RK-24-219 310 -70 1187 99.8 758.5 759 0.5 <500 – 1050
759.5 760 0.5 <500 – 1100
897.5 898 0.5 <500
982 982.5 0.5 <500 – 570
RK-24-220 310 -70 732 116 387 387.5 0.5 <500
445.5 446 0.5 <500 – 510
446 446.5 0.5 <500 – 660
446.5 447 0.5 <500
452 452.5 0.5 <500 – 2400
452.5 453 0.5 <500 – 2000
453 454.5 1.5 <500
454.5 455 0.5 <500 – 650
455.5 456 0.5 <500 – 1700
456 456.5 0.5 600 – 1300
456.5 457 0.5 <500 – 1200
457 457.5 0.5 700 – 27000
457.5 458 0.5 1700 – 41000
459.5 460 0.5 <500 – 550
460 461 1 <500
461 461.5 0.5 <500 – 7000
461.5 462 0.5 <500 – 6000
462 462.5 0.5 740 – 2000
462.5 463 0.5 3500 – 4500
463 463.5 0.5 1300 – 6000
463.5 464 0.5 600 – 6500
464 464.5 0.5 600 – 2000
464.5 465 0.5 700 – 4000
465 465.5 0.5 <500 – 5600
465.5 466 0.5 1200 – 8200
466 466.5 0.5 <500 – 6000
477.5 478 0.5 <500 – 750
478 478.5 0.5 <500 – 800
479 479.5 0.5 <500
479.5 480 0.5 <500 – 800
480 480.5 0.5 <500 – 680
480.5 481 0.5 680 – 1300
481 481.5 0.5 <500 – 600
481.5 482 0.5 <500
482 482.5 0.5 <500 – 520
482.5 483 0.5 <500 – 520
483 483.5 0.5 <500
483.5 484 0.5 <500 – 800
484 484.5 0.5 <500 – 1100
484.5 485 0.5 <500 – 16000
485 485.5 0.5 3000 – 16000
485.5 486 0.5 <500 – 7000
486 486.5 0.5 <500 – 13000
486.5 487 0.5 <500 – 1200
487 488 1 <500
489 489.5 0.5 <500 – 640
489.5 490 0.5 <500 – 950
490 490.5 0.5 <500 – 800
490.5 491 0.5 <500 – 2100
491 491.5 0.5 <500 – 6000
491.5 492 0.5 <500 – 840
495 495.5 0.5 <500
495.5 496 0.5 <500 – 6800
496 496.5 0.5 <500 – 4100
496.5 497 0.5 <500 – 6000
497 497.5 0.5 2600 – 2600
497.5 498 0.5 <500 – 500
498 498.5 0.5 <500 – 1800
498.5 499 0.5 <500
503 503.5 0.5 <500 – 1500
503.5 504.5 1 <500
525.5 526 0.5 <500
539 539.5 0.5 <500
539.5 540 0.5 540 – 7300
570.5 571 0.5 <500 – 730
579.5 580 0.5 <500
580 580.5 0.5 <500 – 510
580.5 581 0.5 <500 – 520
583 583.5 0.5 <500
583.5 584 0.5 <500 – 1500
584 584.5 0.5 <500 – 620
596.5 597 0.5 <500 – 1300
597 597.5 0.5 <500 – 1300
599.5 600 0.5 <500
RK-24-221 310 -70 861.6 115.9 302 302.5 0.5 <500
302.5 303 0.5 <500 – 600
303 303.5 0.5 <500 – 830
594.5 595 0.5 <500
595 595.5 0.5 <500 – 1700
597.5 598 0.5 <500 – 5500
599 599.5 0.5 <500 – 2700
642 642.5 0.5 <500
642.5 643 0.5 <500 – 520
643 643.5 0.5 <500 – 1100
644 644.5 0.5 <500
650.5 651 0.5 <500 – 670
697.5 698 0.5 <500
698 698.5 0.5 <500 – 2300
RK-24-222 354 -65 753 108.4 588 588.5 0.5 770 – 1200
598 599.5 1.5 <500
602.5 603 0.5 <500 – 820
603 603.5 0.5 640 – 2000
603.5 604.5 1 <500
604.5 605 0.5 3000 – 20000
605 605.5 0.5 5800 – 17000
605.5 605.6 0.1 18000 – 60000
605.6 605.7 0.1 >61000
605.7 606 0.3 9000 – 60000
606 606.5 0.5 1800 – 10000
606.5 607 0.5 <500 – 730
607 607.4 0.4 3000 – 60000
607.4 607.8 0.4 >61000
607.8 608 0.2 5000 – 60000
608 608.2 0.2 16000 – 60000
608.2 608.4 0.2 >61000
608.4 608.5 0.1 10000 – 60000
608.5 609 0.5 6400 – 42000
609 609.5 0.5 10000 – 25000
609.5 610 0.5 7000 – 25000
610 610.5 0.5 <500 – 6000
610.5 610.9 0.4 7000 – 60000
610.9 611 0.1 >61000
611 611.5 0.5 4000 – 26000
611.5 612 0.5 3000 – 10000
612 612.5 0.5 700 – 3000
612.5 613 0.5 3000 – 7000
613 613.5 0.5 700 – 6000
613.5 614 0.5 2000 – 33000
614 614.5 0.5 900 – 6000
614.5 615 0.5 1900 – 39000
615 615.5 0.5 580 – 15000
615.5 616 0.5 500 – 5000
616 616.5 0.5 900 – 7500
616.5 617 0.5 900 – 25000
617 617.5 0.5 2800 – 14000
617.5 618 0.5 1100 – 3500
618 618.4 0.4 1300 – 60000
618.4 618.5 0.1 >61000
618.5 619 0.5 15000 – 31000
619 619.5 0.5 9800 – 39000
619.5 620 0.5 3400 – 14500
620 620.5 0.5 1800 – 24000
620.5 621 0.5 2500 – 25000
621 621.5 0.5 <500 – 2800
622 622.5 0.5 <500 – 580
622.5 623 0.5 <500 – 800
623 623.5 0.5 550 – 18000
623.5 624 0.5 500 – 1400
624 624.5 0.5 <500 – 700
624.5 625 0.5 <500 – 10000
625 625.4 0.4 500 – 60000
625.4 625.5 0.1 >61000
625.5 626 0.5 700 – 40000
627 627.5 0.5 <500
629 629.5 0.5 <500 – 1000
640 640.5 0.5 <500 – 600
640.5 641 0.5 <500 – 510
649 649.5 0.5 <500
658 658.5 0.5 <500 – 800
658.5 659 0.5 <500
665 665.5 0.5 <500
668 668.5 0.5 <500 – 800
668.5 669 0.5 <500 – 560
671 671.5 0.5 <500
687 687.5 0.5 <500
RK-24-223 345 -66 TBD 106.8 336 336.5 0.5 <500 – 800
633 633.5 0.5 <500 – 7200
633.5 634 0.5 <500 – 40000
634 634.5 0.5 <500 – 1300
634.5 635 0.5 <500 – 1700
635 635.5 0.5 <500
645.5 646 0.5 <500 – 740
646 646.5 0.5 2100 – 10000
646.5 647 0.5 7500 – 24000
647 647.5 0.5 1000 – 24000
675 675.5 0.5 500 – 4200
675.5 676 0.5 1200 – 7200
676 676.5 0.5 <500 – 3700
678 678.5 0.5 <500 – 700
678.5 679 0.5 <500
679.5 680 0.5 <500 – 800
689.5 690 0.5 <500 – 2500
690 690.5 0.5 5000 – 14000
690.5 691 0.5 4000 – 12000
691 691.5 0.5 <500 – 6000
691.5 692 0.5 3000 – 12000
692 692.5 0.5 5000 – 14000
692.5 693 0.5 <500 – 1100
695.5 696 0.5 <500 – 3100
696 696.5 0.5 <500 – 1500
696.5 697 0.5 <500
702.5 703.5 1 <500
704.5 705 0.5 <500
713.5 714 0.5 <500 – 1700
714.5 715 0.5 <500
715 715.5 0.5 <500 – 1200
716 716.5 0.5 1200 – 1800
716.5 717 0.5 <500 – 1100
717 717.5 0.5 1500 – 2200
717.5 718 0.5 <500 – 2000
718 718.5 0.5 <500 – 5100
720.5 721 0.5 <500 – 5900
721 721.5 0.5 <500 – 2000
722 722.5 0.5 1100 – 12000
722.5 723 0.5 1500 – 23000
723 723.5 0.5 3500 – 37000
726 726.5 0.5 <500 – 3000
726.5 727 0.5 3000 – 12000
727 727.5 0.5 <500
737.5 738 0.5 <500 – 5000
738 738.5 0.5 <500 – 1400
743 743.5 0.5 <500 – 700
749 750 1 <500
756.5 757 0.5 <500
757.5 758 0.5 <500
758.5 759 0.5 <500
759 759.5 0.5 <500 – 720
760 760.5 0.5 <500 – 3000
763.5 764 0.5 <500 – 650
764.5 765.5 1 <500
765.5 766 0.5 900 – 3700
766 766.5 0.5 800 – 15000
766.5 767 0.5 800 – 25000
767 767.5 0.5 1000 – 11000
767.5 768 0.5 <500
772 772.5 0.5 <500-500
772.5 773 0.5 <500
773.5 774 0.5 <500 – 700
774 774.5 0.5 <500 – 10000
775 775.5 0.5 <500
RK-24-224 310 -70 TBD 115.8 TBD
  • All depths and intervals are meters downhole, true thicknesses are yet to be determined.
  • “Off-scale” refers to >61,000 cps total readings by gamma spectrometer type RS-125.
  • Unconformity of ‘N/A’ denotes a lack of visible contact between Athabasca sandstone and basement rock.
  • Maximum internal dilution 2.0 m downhole.
  • Minimum thickness of 0.5 m downhole.
  • All depths and intervals are metres downhole, true thicknesses are yet to be determined. Resource modelling in conjunction with an updated mineral resource estimate is required before true thicknesses can be determined.

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 standards in environmental and social governance. The Rook I Project is supported by a NI 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.

www.nexgenenergy.ca

Technical Disclosure*

All technical information in this news release has been reviewed and approved by Jason Craven, NexGen’s Manager, 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.sedar.com ) and EDGAR (www.sec.gov/edgar.shtml ) and is available for review on NexGen Energy’s website (www.nexgenenergy.ca ).

IBF4

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