NexGen Announces Best Assays from Patterson Corridor East in Hole RK-25-232

  • RK-25-232 assays returned NexGen’s best discovery phase intercept to date: 15.0 m at 15.9% U3O8 including 3.0 m at 47.8%, 1.5 m at 29.4% and an intercept of 0.5 m at 68.8%

  • Ranks among the world’s highest-grade basement-hosted uranium vein intercepts, validating the growing significance of Patterson Corridor East (“PCE”)

  • Exceptional continuity confirmed, with RK-24-222 intersecting 17.0 m at 3.85% U3O8, located 200 m from RK-25-232

  • Winter 2025 drill program added 9 new high-grade intercepts, reinforcing the scale and strength of the system

Vancouver, British Columbia–(Newsfile Corp. – May 27, 2025) – NexGen Energy Ltd. (TSX: NXE) (NYSE: NXE) (ASX: NXG) (“NexGen” or the “Company”) is thrilled to announce the Company’s best discovery phase assay results, with 15.0 meters (m) at 15.9% U3O8, including a peak intercept of 0.5 m at an exceptional 68.8% U3O8, in drillhole RK-25-232. Included within this phenomenal intercept is 3.0 m at 47.8% U3O8 and 1.5 m at 29.4% U3O8. This result ranks among the highest-grade basement hosted uranium vein intercepts in the world.

Assay results from two of the best holes drilled to date at PCE, RK-24-222 and RK-25-232, indicate intense high-grade mineralization 200 m apart (Figures 1 and 2, Tables 1 and 2), confirming scale and continuity early in the discovery phase. Winter activity since the last update continued to build momentum, adding 9 new intersections of off-scale (>61,000 cps) mineralization, bringing the total to 13 high-grade intercepts and reinforce confidence in the materiality of this emerging mineralization. Since discovery (see March 11, 2024, news release), 64 drillholes totalling 47,425.9 m have been completed, with 35 intersecting mineralization that remains open in most directions.

Further, RK-24-222 returned 17.0 m at 3.85% U3O8 including 3.0 m at 10.1% U3O8 and an intercept of 0.5 m at 28.2% U3O8 within massive replacement style uranium mineralization. These results are accelerating NexGen’s understanding of the PCE system and shaping the next phase of exploration targeting. Assays at SRC lab continue to see backlogs with NexGen now having received 75% of the 2024 assay results. Remaining will follow as they are received back from the independent lab. Drilling at PCE will resume on June 1st, 2025, and reporting of 2025 assays will be completed on an ongoing basis.

Leigh Curyer, Chief Executive Officer, commented: “Patterson Corridor East has delivered these exceptional assay results. RK-25-232 is an exceptionally high calibre intersection considering the program is very early in the evaluation of PCE.

Identical to Arrow, mineralization at PCE is wholly hosted in competent basement rock and exhibits all the same characteristics of an intense high-grade mineralized system. PCE is only 3.5 km from the future Rook I Project that is in the final Federal approval stage with the CNSC having received Provincial Approval in November 2023.

The scale of 2025 program drilling at PCE underscores NexGen’s commitment to advancing new sources of uranium supply at a time the world is committing to the deployment of nuclear energy. Notably, President Trump last Thursday, signing four executive orders to immediately accelerate the deployment of nuclear energy in the US, with objective of increasing US nuclear energy output from 100GW to 400GW by 2050. The importance of Rook I and the further development of PCE has never been greater to meet the world’s nuclear fuel requirements for the approaching decades.”

Jason Craven, Vice President, Exploration, commented: “These assays received to date confirm advancement of our 3D model of PCE which sets us up for targeting future drill hole locations at PCE. The focus to both expand the overall footprint as well as define and expand the high-grade sub-domains within PCE. Mineralization style and intensity, mirrored with Arrow 3.5 km away, speaks to the broader endowment of the underexplored NexGen portfolio in southwest Athabasca Basin. NexGen provides everyone with the tremendously unique opportunity of building a true tier one mine whilst simultaneously developing the exciting PCE.”

Other Highlights

  • RK-24-207 returned 9.5 m at 2.91% U3O8 including 0.5 m at 28.2% U3O8, located approximately 79 m from RK-25-232 and 82 m from RK-24-222.
  • RK-25-239 and RK-25-244 intersected 10.3 m containing >10,000 cps including 1.1 m of cumulative >61,000 cps, and 7.5 m containing >10,000 cps including 2.6 m of cumulative >61,000 cps, respectively. Although assays are pending, RK-25-239 and RK-25-244 speak to the consistency of the system and repeatability of uranium mineralization that is further substantiated by the exceptional assay results of RK-25-232 and RK-24-207.

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Table 1: 2025 Assay results received since March 24, 2025 news release to present

Drillhole Unconformity Depth (m) SRC Geoanalytical Results
(Cutoff 0.01%)
Hole ID Azimuth Dip Total Depth (m) From
(m)
To
(m)
Width
(m)
U3O8
(wt%)
RK-25-225 330 -70 684 108.6 Assays Pending
RK-25-226 330 -70 655.5 N/A Assays Pending
RK-25-227 330 -70 657 113.4 Assays Pending
RK-25-228 330 -75 609 117.1 Assays Pending
RK-25-229 350 -70 681.4 113.2 Assays Pending
RK-25-230 330 -70 598 112.5 Assays Pending
RK-25-231 329 -69.5 885 102.7 Assays Pending
RK-25-232 330 -70 552.4 112.5 388 389 1 0.01
392.5 396 3.5 0.04
408 409 1 0.05
409.5 413.5 4 0.04
414.5 415 0.5 0.01
426.5 428 1.5 0.02
431 431.5 0.5 0.01
433 433.5 0.5 0.01
435 438 3 0.05
440 452 Assays Pending
452 467 15 15.9
incl. 458.5 461.5 3 47.8
incl. 459.5 460 0.5 68.8
incl. 463.5 465 1.5 29.4
467 542 Assays Pending
RK-25-233 330 -70 694 109.7 Assays Pending
RK-25-234 330 -70 747 113 Assays Pending
RK-25-235 270 -70 858 105.5 Assays Pending
RK-25-236 267 -65 541 129 Assays Pending
RK-25-237 340 -70 816 104.6 No Significant Intersections
RK-25-238a 279 -67 165 123.4 No Significant Intersections
RK-25-239 278 -68 594 123.4 Assays Pending
RK-25-240 270 -70 893 106.1 Assays Pending
RK-25-241 320 -71 534 117.2 Assays Pending
RK-25-242 270 -70 555 124.5 Assays Pending
RK-25-243 276 -66 579 126.8 Assays Pending
RK-25-244 330 -70 586.6 112.4 Assays Pending

 

  • All depths and intervals are meters downhole, true thicknesses are yet to be determined.
  • 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.
  • Cutoff grade 0.01% U3O8.
  • All depths and intervals are metres downhole, true thicknesses are yet to be determined. Resource modelling in conjunction with an updated mineral resource estimate is required before true thicknesses can be determined.

Table 2: 2024 Assays received since May 29, 2024

Drillhole Unconformity Depth (m) SRC Geoanalytical Results
(Cutoff 0.01%)
Hole ID Azimuth Dip Total Depth (m) From
(m)
To
(m)
Width
(m)
U3O8
(wt%)
RK-24-193 310 -70 621 N/A 383.5 385.5 2 0.06
389.5 390 0.5 0.09
393.5 394 0.5 0.02
400.5 403.5 3 0.03
406 407 1 0.03
412.5 414 1.5 0.03
416.5 419 2.5 0.18
419.5 420 0.5 0.81
420.5 425 4.5 0.23
426.5 428 1.5 0.18
428.5 429 0.5 0.06
429.5 431 1.5 0.51
432 437 4 0.73
442.5 443 0.5 0.08
449 451 2 0.16
RK-24-194 310 -70 420 98.8 No Significant Intersections
RK-24-195 310 -70 588.0 N/A No Significant Intersections
RK-24-196 310 -70 841.0 103.4 702 704.5 2.5 0.90
705.5 706 0.5 0.02
723.5 724 0.5 0.05
731 733 2 0.35
incl. 731.5 732 0.5 1.19
734.5 735 0.5 0.01
741 741.5 0.5 0.24
742.5 743 0.5 0.01
744.5 747 2.5 0.25
747.5 748 0.5 0.03
748.5 750.5 2 0.09
751 751.5 0.5 0.01
754.5 755.5 1 0.01
757 757.5 0.5 0.07
758 758.5 0.5 0.02
760.5 761 0.5 0.01
765.5 766 0.5 0.03
RK-24-197 310 -70 792.0 117.7 518 518.5 0.5 0.01
521 522.5 1.5 0.02
523.5 530 6.5 0.97
incl. 526.5 529 2.5 2.26
531 532 1 0.02
532.5 534.5 2 0.03
544 545.5 1.5 0.01
546 554 8 0.61
incl. 548.5 549 0.5 3.97
incl. 552.5 553 0.5 4.53
554.5 555 0.5 0.01
556 557 1 0.01
RK-24-198 310 -70 743.2 117.3 No Significant Intersections
RK-24-199 310 -70 807.0 107.1 No Significant Intersections
RK-24-200 310 -70 804.0 112.6 611 611.5 0.5 0.03
612 612.5 0.5 0.01
613 613.5 0.5 0.03
619 620 1 0.01
623 623.5 0.5 0.02
RK-24-201 310 -70 939.0 108.9 673.5 674 0.5 0.03
674.5 676 1.5 0.07
677.5 678 0.5 0.02
678.5 679.5 1 0.04
680.5 681 0.5 0.02
694.5 697.5 3 0.09
698 699 1 0.01
699.5 704 3.5 0.04
708 708.5 0.5 0.03
721.5 722 0.5 0.01
765.5 766 0.5 0.03
819 819.5 0.5 0.03
822.5 823 0.5 0.02
867.5 868 0.5 0.01
RK-24-202 310 -70 1138.2 106.3 886 886.5 0.5 0.02
887.5 888 0.5 0.03
895.5 896 0.5 0.45
922 923 1 0.01
926.5 927 0.5 0.05
927.5 928.5 1 0.10
931 932.5 1.5 0.23
933.5 934.5 1 3.49
incl. 934 934.5 0.5 6.96
936 936.5 0.5 2.44
943.5 944.5 1 0.12
951.5 952 0.5 2.37
966 966.5 0.5 1.46
967.5 968 0.5 2.75
976.5 977 0.5 0.01
980 980.5 0.5 0.31
981 981.5 0.5 0.06
983 986 3 0.25
996.5 997 0.5 0.02
997.5 998.5 1 0.14
1005 1007 2 0.06
1009 1009.5 0.5 0.01
1016.5 1017.5 1 0.04
1026.5 1028.5 2 0.03
RK-24-203 310 -70 738.0 103.7 No Significant Intersections
RK-24-204 290 -70 822.0 110.1 551 563 9 0.06
574 602 21 0.31
incl. 575 575.5 0.5 1.19
incl. 581 582 1 1.67
incl. 587.5 588 0.5 1.10
RK-24-205 320 -70 1032.0 109.1 742 748 3.5 0.16
766 776 5.3 0.11
779.5 780.5 1 0.01
783.5 795.5 11.5 0.14
802 808.5 3 0.03
853.5 854 0.5 0.04
RK-24-206 298 -75 1377.0 96.5 No Significant Intersections
RK-24-207 330 -70 801.0 114.9 504 506 2 0.05
506.5 507.5 1 0.03
508 508.5 0.5 0.03
509 510.5 1.5 0.05
511 511.5 0.5 0.01
514 518 4 0.09
519 535 16 1.83
incl. 522 531.5 9.5 2.91
incl. 525 525.5 0.5 28.2
536 538 2 0.62
538.5 539 0.5 0.09
539.5 540 0.5 0.01
540 541 1 0.88
553.5 554.5 1 0.03
557.5 559 1.5 0.02
560 560.5 0.5 0.01
567.5 568 0.5 0.05
572.5 573 0.5 0.03
581.5 582 0.5 0.04
582.5 583 0.5 0.01
583.5 584.5 1 0.03
585.5 586 0.5 0.12
588 588.5 0.5 0.01
595 596 1 0.03
596.5 597 0.5 0.01
600.5 601 0.5 0.01
603 604 1 0.02
616.5 617 0.5 0.03
619 619.5 0.5 0.06
626 627 1 0.03
636 636.5 0.5 0.01
640 640.5 0.5 0.01
644 645.5 1.5 0.03
717.5 718.5 1 0.12
729 730.5 1.5 0.46
730.5 734 Assays Pending
RK-24-208 310 -70 756 104.3 Assays Pending
RK-24-209 310 -70 840 110.7 Assays Pending
RK-24-210 310 -70 1095 102.4 Assays Pending
RK-24-211 310 -70 1302 103.1 Assays Pending
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 Assays Pending
RK-24-215 310 -70 840 114.8 Assays Pending
RK-24-216 310 -70 1071 99.7 787 789 2 0.21
789.5 791 1.5 0.09
790.5 791 0.5 0.01
791.5 792 0.5 0.04
805 806 1 0.05
807.5 808.5 1 0.02
811.5 812 0.5 0.76
814.5 817 2.5 0.17
RK-24-217 310 -70 1185 105.6 No Significant Intersections
RK-24-217a 310 -70 120 105.1 No Significant Intersections
RK-24-218 310 -70 696 109.6 494.5 495.5 1 0.03
515.5 519 3.5 0.09
520 521 1 0.01
RK-24-219 310 -70 1187 99.8 No Significant Intersections
RK-24-220 310 -70 732 116 445.5 447 1.5 0.04
450 450.5 0.5 0.01
452 469 17 0.43
incl. 457 457.5 0.5 1.52
incl. 457.5 458 0.5 3.30
incl. 462.5 463.5 1 1.06
incl. 465.5 466 0.5 1.26
469.5 470 0.5 0.01
471 471.5 0.5 0.02
475.5 488.5 13 0.32
incl. 484.5 485 0.5 1.16
incl. 485 485.5 0.5 2.35
incl. 486 486.5 0.5 2.18
489 494 5 0.20
494.5 499.5 5 0.38
500 500.5 0.5 0.01
503 504.5 1.5 0.05
520.5 521 0.5 0.02
521.5 522 0.5 0.02
522.5 523 0.5 0.01
525.5 526.5 1 0.01
539.5 540 0.5 0.52
544.5 546 1.5 0.02
570.5 571 0.5 0.02
579.5 581 1.5 0.04
583 584.5 1.5 0.07
585.5 586 0.5 0.01
596.5 597.5 1 0.12
599.5 600 0.5 0.03
RK-24-221 310 -70 861.6 115.9 Assays Pending
RK-24-222 354 -65 753 108.4 587.5 604.5 Assays Pending
604.5 621.5 17 3.85
incl. 607 610 3 10.1
621.5 688 Assays Pending
RK-24-223 345 -66 876 106.8 633 635.5 2.5 1.90
incl. 633.5 634 0.5 8.56
645.5 647.5 2 1.41
incl. 646.5 647.5 1 2.21
675 676.5 1.5 0.42
678 678.5 0.5 0.02
679.5 680 0.5 0.06
689.5 693.5 4 0.93
695.5 697 1.5 0.05
701.5 702 0.5 0.01
702.5 703 0.5 0.01
703 703.5 0.5 0.01
705 705.5 0.5 0.01
707.5 708 0.5 0.01
713.5 714 0.5 0.07
714.5 715.5 1 0.03
716 718.5 2.5 0.25
720.5 721.5 1 0.09
722 723.5 1.5 1.18
incl. 723 723.5 0.5 2.15
726 727.5 1.5 0.34
728.5 764.5 Assays Pending
764.5 768 3.5 0.57
768.5 777.5 Assays Pending
RK-24-224 310 -70 744 115.8 493 504 Assays Pending
504 505 1 0.34
505.5 509 3.5 0.36
509 539 Assays Pending

 

  • All depths and intervals are meters downhole, true thicknesses are yet to be determined.
  • 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.
  • Cutoff grade 0.01% U3O8.
  • 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.

Table 4: 2025 Spectrometer results from March 24, 2025 news release to present

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-25-235 270 -70 858 105.5 No Significant Intersections.
RK-25-237 340 -70 816.0 104.6 No Significant Intersections.
RK-25-238a 279 -67 165 123.4 No Significant Intersections.
RK-25-239 278 -68 594 123.4 212.5 213 0.5 <500 – 850
365 366 1 <500
390.5 391.5 1 <500 – 800
391.5 392 0.5 <500 – 2400
392 394.5 2.5 <500
394.5 395 0.5 <500 – 950
395 395.5 0.5 <500 – 800
395.5 396 0.5 <500
396 396.5 0.5 <500 – 600
396.5 397 0.5 500 – 1100
397 397.5 0.5 <500
398 398.5 0.5 <500 – 700
398.5 399 0.5 <500 – 900
400.5 402.5 2 <500
405 405.5 0.5 <500
406.5 407 0.5 <500
407 407.5 0.5 700 – 1400
407.5 408 0.5 700 – 14000
408 409 1 <500 – 700
409 409.5 0.5 <500 – 3100
409.5 410 0.5 <500 – 1200
410 410.5 0.5 <500 – 700
411 411.5 0.5 <500
414 414.5 0.5 <500
414.5 415 0.5 600 – 800
415 415.5 0.5 <500
416.5 418.5 2 <500
418.5 419 0.5 <500 – 600
419 419.5 0.5 <500
419.5 420.5 1 <500 – 550
420.5 421.5 1 <500
422.5 423 0.5 <500
424.5 425 0.5 <500
425.5 426 0.5 <500
428.5 429.5 1 <500
430 431.5 1.5 <500
432 433.5 1.5 <500
433.5 434 0.5 <500 – 650
434 434.5 0.5 <500 – 1100
434.5 435 0.5 <500
435 435.5 0.5 <500 – 600
435.5 436 0.5 600 – 2000
436 436.5 0.5 700 – 1000
436.5 437 0.5 2500 – 3500
437 437.5 0.5 7000 – 31000
437.5 438 0.5 12000 – 28000
438 438.3 0.3 17000 – 35000
438.3 438.4 0.1 >61000
438.4 438.5 0.1 17000 – 32000
438.5 439 0.5 12000 – 49000
439 439.5 0.5 23000 – 51000
439.5 440 0.5 30000 – 40000
440 440.5 0.5 26000 – 41000
440.5 440.7 0.2 >61000
440.7 440.9 0.2 36000 – 50000
440.9 441 0.1 >61000
441 441.4 0.4 >61000
441.4 441.6 0.2 30000 – 50000
441.6 442 0.4 10000 – 46000
442 442.5 0.5 10000 – 54000
442.5 443 0.5 3000 – 13000
443 443.5 0.5 3000 – 45000
443.5 444 0.5 1500 – 25000
444 444.5 0.5 2500 – 28000
444.5 445 0.5 400 – 1350
445 445.5 0.5 <500 – 800
445.5 446 0.5 <500 – 700
448 449.5 1.5 <500
449.5 450 0.5 <500 – 700
450 450.5 0.5 <500 – 600
450.5 451 0.5 <500 – 700
451 451.5 0.5 700 – 3500
451.5 452 0.5 500 – 1100
453 454.5 1.5 <500
456 457 1 <500
458 458.5 0.5 <500
461.5 462 0.5 <500
463 464.5 1.5 <500
466.5 467 0.5 <500
468 468.5 0.5 <500 – 550
468.5 469 0.5 <500
469.5 470 0.5 <500 – 550
470 471.5 1.5 <500
471.5 472 0.5 <500 – 3200
472 472.5 0.5 1200 – 11000
472.5 473 0.5 1100 – 4600
473 473.5 0.5 <500
476 476.5 0.5 <500
476.5 477 0.5 <500 – 600
477 478 1 <500
478 478.5 0.5 <500 – 3100
478.5 479 0.5 600 – 5000
479 479.5 0.5 <500 – 1100
480.5 481.5 1 <500
482.5 483 0.5 <500
483.5 484 0.5 <500
484 485 1 <500 – 550
486 486.5 0.5 <500
486.5 487 0.5 700 – 2000
487 487.5 0.5 1000 – 9000
487.5 488 0.5 <500 – 1100
490 490.5 0.5 <500
490.5 490.7 0.2 1500 – 4000
490.7 491 0.3 >61000
491 491.5 0.5 1000 – 34000
498 498.5 0.5 <500 – 580
498.5 499 0.5 <500 – 960
499 499.5 0.5 <500 – 2600
499.5 500 0.5 <500 – 1200
501.5 502 0.5 <500
502.5 503 0.5 <500
503.5 504 0.5 1200 – 57000
504 504.5 0.5 1200 – 10000
505.5 506 0.5 <500 – 800
507.5 508 0.5 <500 – 5400
508 508.5 0.5 1100 – 4500
509.5 510 0.5 <500
514.5 515 0.5 <500 – 1400
518.5 519 0.5 <500
519 519.5 0.5 <500 – 600
519.5 520 0.5 <500 – 1400
RK-25-240 270 -70 893 106.1 653.5 654.5 1.0 <500
658.5 659 0.5 <500
659.5 660 0.5 <500
660 660.5 0.5 <500 – 1000
660.5 661 0.5 <500 – 650
661 661.5 0.5 <500 – 5400
661.5 662 0.5 <500
662 663 1.0 <500 – 1000
663 663.5 0.5 <500 – 950
663.5 664 0.5 <500 – 800
664 664.5 0.5 3400 – 19000
664.5 665 0.5 <500 – 700
665 665.5 0.5 600 – 3300
665.5 666 0.5 700 – 33000
666 666.5 0.5 500 – 1200
666.5 667 0.5 700 – 2200
667 667.5 0.5 1200 – 2900
667.5 668 0.5 <500 – 1200
668 668.5 0.5 1100 – 8600
668.5 669.5 1.0 <500 – 1400
669.5 670 0.5 <500
670 670.5 0.5 1100 – 3900
670.5 671 0.5 <500 – 600
671.5 672 0.5 <500 – 700
672 672.5 0.5 <500 – 1200
673 673.5 0.5 <500 – 6000
673.5 674 0.5 <500 – 3200
675 675.5 0.5 900 – 15000
675.5 676 0.5 500 – 1700
676 676.5 0.5 500 – 1800
676.5 677 0.5 <500 – 1300
677 677.5 0.5 <500 – 600
677.5 678 0.5 500 – 900
678 678.5 0.5 <500 – 1800
678.5 679 0.5 <500
679 679.5 0.5 600 – 3000
679.5 680 0.5 <500
680 680.5 0.5 <500 – 550
680.5 681 0.5 600 – 1100
681 681.5 0.5 600 – 3200
681.5 682 0.5 600 – 2300
682 682.5 0.5 500 – 600
682.5 683 0.5 500 – 700
683 683.5 0.5 <500 – 550
683.5 684 0.5 <500
684 684.5 0.5 700 – 3000
684.5 685 0.5 3600 – 12000
685 685.1 0.1 4000 – 8000
685.1 685.6 0.5 >61000
685.6 685.8 0.2 15000 – 20000
685.8 686 0.2 >61000
686 686.5 0.5 1000 – 5500
686.5 687 0.5 7000 – 47000
687 687.5 0.5 2200 – 25000
687.5 688 0.5 1000 – 3800
688 688.5 0.5 600 – 1500
688.5 689 0.5 <500 – 1000
689 689.5 0.5 500 – 700
689.5 690 0.5 <500
690 690.5 0.5 <500 – 1100
690.5 691 0.5 1200 – 1500
691 691.5 0.5 700 – 1000
691.5 692 0.5 800 – 1100
692 692.5 0.5 <500 – 800
692.5 693.5 1.0 <500
694.5 695 0.5 <500
695 695.5 0.5 <500 – 750
695.5 696.5 1.0 <500 – 800
696.5 697 0.5 <500 – 700
697 697.5 0.5 <500
697.5 698 0.5 <500 – 550
698 698.5 0.5 1000 – 4600
698.5 699 0.5 <500 – 900
699.5 700 0.5 500 – 1000
700 700.5 0.5 <500 – 1300
700.5 703 2.5 <500
703 703.5 0.5 <500 – 700
703.5 704 0.5 <500 – 550
705.5 706 0.5 <500
706 706.5 0.5 <500 – 3500
714.5 715 0.5 550 – 10000
715 715.5 0.5 <500
717.5 718 0.5 500 – 1300
718.5 722 3.5 <500
726.5 727 0.5 <500 – 800
728 730 2.0 <500
730 730.5 0.5 <500 – 550
731 731.5 0.5 <500
732.5 733 0.5 1100 – 11000
733 733.5 0.5 4000 – 7000
733.5 734 0.5 <500 – 9000
734 734.5 0.5 <500
734.5 735 0.5 <500 – 550
735 735.5 0.5 <500 – 6100
735.5 736 0.5 800 – 25000
736 736.5 0.5 <500 – 1500
736.5 737 0.5 <500 – 540
737 738 1.0 <500 – 600
738 738.5 0.5 6000 – 20000
738.5 739 0.5 750 – 10000
739 739.5 0.5 <500
739.5 740 0.5 <500 – 1100
740 740.5 0.5 <500 – 600
740.5 741 0.5 <500 – 550
741 741.5 0.5 600 – 2500
741.5 742 0.5 500 – 4600
742 742.5 0.5 <500 – 700
742.5 742.9 0.4 <500
749.5 750.5 1.0 <500
752.5 753 0.5 <500 – 900
754.5 755 0.5 <500
755 755.5 0.5 <500 – 780
755.5 756 0.5 <500 – 620
756.5 757 0.5 <500 – 520
757 759.5 2.5 <500
760 760.5 0.5 <500 – 980
760.5 761 0.5 530 – 1050
761 761.5 0.5 500 – 1800
761.5 762 0.5 <500
762 762.5 0.5 830 – 8400
762.5 763 0.5 530 – 2200
763 763.5 0.5 890 – 2700
763.5 764 0.5 260 – 1200
764.5 765 0.5 1000 – 1700
765 765.5 0.5 600 – 1900
765.5 766 0.5 <500 – 1000
766.5 767 0.5 <500 – 850
767 767.5 0.5 <500 – 1500
774 774.5 0.5 2000 – 5000
774.5 775 0.5 <500 – 1100
775 775.5 0.5 1100 – 2700
775.5 776 0.5 <500 – 2100
776.5 777 0.5 <500 – 1100
778 778.5 0.5 <500 – 1100
780 780.5 0.5 2500 – 7000
798.5 799 0.5 <500 – 8400
804.5 805 0.5 <500 – 560
RK-25-241 320 -71 534 117.2 396 396.5 0.5 <500 – 650
396.5 397 0.5 <500
413 413.5 0.5 <500 – 850
413.5 414 0.5 <500 – 2500
414 414.5 0.5 <500 – 800
414.5 415 0.5 <500 – 1700
415 415.5 0.5 <500
415.5 416 0.5 <500
416 416.5 0.5 <500 – 6500
416.5 417 0.5 <800 – 2000
417 417.5 0.5 1000 – 3500
417.5 418 0.5 2000 – 11000
418 418.5 0.5 3500 – 11000
418.5 419 0.5 1000 – 6500
419 419.5 0.5 <500
421 421.5 0.5 <500
423.5 424 0.5 <500
424 424.5 0.5 <500 – 1500
424.5 425 0.5 <500 – 600
425 425.5 0.5 <500 – 1100
425.5 426 0.5 <500 – 700
426 426.5 0.5 <500
427.5 428.5 1.0 <500
428.5 429 0.5 <500 – 600
432 432.5 0.5 <500 – 700
432.5 433 0.5 <500
434 434.5 0.5 <500
434.5 435 0.5 500 – 800
435 436.5 1.5 <500
436.5 437 0.5 <500 – 700
437 437.5 0.5 <500 – 550
437.5 438 0.5 <500
438 438.5 0.5 <500 – 550
439.5 440 0.5 <500 – 550
440 440.5 0.5 <500 – 2000
444 444.5 0.5 <500 – 900
447.5 448.5 1.0 <500
448.5 449 0.5 <500 – 1100
449 449.5 0.5 8000 – 54000
449.5 450 0.5 15000 – 26000
450 450.5 0.5 4000 – 15000
450.5 451 0.5 <500 – 1500
451 451.5 0.5 <500
451.5 452 0.5 <500
452 452.5 0.5 <500 – 550
452.5 454 1.5 <500
454 454.5 0.5 500 – 1200
454.5 455 0.5 500 – 5000
455 455.5 0.5 1500 – 34000
455.5 456 0.5 500 – 1100
456 456.5 0.5 500 – 1500
456.5 457 0.5 500 – 1100
461 461.5 0.5 <500
462 462.5 0.5 <500
462.5 463 0.5 <500 – 1000
463 463.5 0.5 <500
463.5 464 0.5 <500 – 1100
464 464.5 0.5 800 – 1200
464.5 465 0.5 <500
465 465.5 0.5 <500 – 550
466 466.5 0.5 <500
467 467.5 0.5 <500
471 471.5 0.5 <500
489 489.5 0.5 <500
496 496.5 0.5 <500
497.5 498 0.5 <500
498 498.5 0.5 <500 – 520
501 501.5 0.5 <500 – 850
503 503.5 0.5 <500 – 700
RK-25-242 270 -70 555.00 124.50 No Significant Intersections.
RK-25-243 276 -66 579.00 126.80 207.5 208 0.5 <500 – 690
208 208.5 0.5 <500
360 364.5 4.5 <500
365 365.5 0.5 <500 – 1000
365.5 366 0.5 650 – 1200
366 366.5 0.5 <500 – 1200
366.5 367 0.5 <500 – 2500
367 367.5 0.5 <500 – 4000
367.5 368 0.5 <500 – 850
368 368.5 0.5 1000 – 25000
368.5 369 0.5 <500 – 16000
371 371.5 0.5 <500 – 800
371.5 372 0.5 <500
372 372.5 0.5 <500
372.5 373 0.5 <500 – 800
373 373.5 0.5 <500 – 1000
374 374.5 0.5 <500 – 700
375 375.5 0.5 <500
376.5 377 0.5 <500 – 750
384.5 385 0.5 <500 – 900
385 385.5 0.5 <500
385.5 386 0.5 <500 – 800
386 386.5 0.5 <500 – 1000
386.5 387 0.5 <500 – 900
387 387.5 0.5 <500 – 3500
400.5 401 0.5 <500
402 403 1.0 <500
404.5 406 1.5 <500
406 406.5 0.5 <500 – 1000
406.5 407.5 1.0 <500
409 409.5 0.5 <500 – 940
409.5 410 0.5 <500 – 1900
410 410.5 0.5 <500 – 650
410.5 411 0.5 <500
411 411.5 0.5 <500 – 3900
411.5 414.5 3.0 <500
417 417.5 0.5 <500 – 800
417.5 418 0.5 <500 – 1550
418 418.5 0.5 <500 – 850
418.5 419 0.5 <500 – 1100
419 420 1.0 <500
421.5 422 0.5 <500
422 422.5 0.5 <500 – 600
422.5 424 1.5 <500
424 424.5 0.5 <500 – 1100
424.5 425 0.5 600 – 1100
425 425.5 0.5 1500 – 2400
425.5 426 0.5 500 – 2600
426 426.5 0.5 1100 – 11000
426.5 427 0.5 <500
432 433.5 1.5 <500
433.5 434 0.5 <500 – 550
434 434.5 0.5 <500 – 1100
434.5 435 0.5 <500 – 580
435 435.5 0.5 <500
435.5 436 0.5 900 – 1100
436 436.5 0.5 <500 – 1300
436.5 437 0.5 <500
446.5 447 0.5 <500 – 720
452 452.5 0.5 <500
453 453.5 0.5 <500
453.5 454 0.5 <500 – 950
455.5 456 0.5 <500 – 660
456 457 1.0 <500
459.5 460.5 1.0 <500
472 472.5 0.5 <500 – 3200
473 473.5 0.5 <500
475 475.5 0.5 <500
476.5 477 0.5 <500
478 478.5 0.5 <500
480 480.5 0.5 <500 – 7500
480.5 481 0.5 <500 – 650
481 481.5 0.5 <500
481.5 482 0.5 <500 – 1800
482 482.5 0.5 <500
488 488.5 0.5 <500
488.5 489 0.5 <500 – 4500
489 489.5 0.5 <500
489.5 490 0.5 <500 – 730
490 490.5 0.5 <500 – 1500
490.5 491 0.5 <500 – 700
503 503.5 0.5 <500 – 1300
RK-25-244 330 -70 586.60 112.40 412 412.5 0.5 <500 – 920
412.5 413 0.5 1100 – 4400
413 413.5 0.5 <500 – 620
414 415 1.0 <500
420.5 421 0.5 <500
421.5 422 0.5 <500 – 780
422 422.5 0.5 <500 – 830
422.5 423 0.5 <500 – 660
423 423.5 0.5 <500 – 950
423.5 424 0.5 <500 – 920
424 424.5 0.5 <500 – 540
424.5 425 0.5 <500
427.5 428 0.5 <500
428 428.5 0.5 <500 – 6400
428.5 429 0.5 <500
430 430.5 0.5 <500
434 434.5 0.5 <500
453.5 454 0.5 <500
454 455 1.0 <500
455 455.5 0.5 <500 – 700
455.5 456 0.5 <500 – 2400
456.5 458.5 2.0 <500
458.5 459 0.5 <500 – 1800
459 459.5 0.5 <500
462 464.5 2.5 <500
464.5 465 0.5 <500 – 1900
465 465.5 0.5 1100 – 3600
465.5 466 0.5 910 – 1800
466 466.5 0.5 <500 – 1400
466.5 467 0.5 880 – 7000
467 467.5 0.5 780 – 3500
467.5 468 0.5 550 – 700
468 468.5 0.5 1200 – 17000
468.5 469 0.5 1500 – 24000
469 469.5 0.5 <500 – 1400
469.5 470 0.5 <500 – 540
470 470.5 0.5 <500 – 830
470.5 471 0.5 <500
471 471.5 0.5 <500 – 1400
471.5 472 0.5 720 – 1600
472 472.5 0.5 1500 – 13000
472.5 473 0.5 7000 – 30000
473 473.2 0.2 20000 – 55000
473.2 473.5 0.3 >61000
473.5 474 0.5 7000 – 40000
474 474.5 0.5 4500 – 9000
474.5 475 0.5 1300 – 26000
475 475.1 0.1 9000 – 26000
475.1 475.4 0.3 >61000
475.4 475.5 0.1 19000 – 41000
475.5 477.3 1.8 >61000
477.3 477.4 0.1 10000 – 15000
477.4 477.6 0.2 >61000
477.6 478 0.4 10000 – 21000
478 478.5 0.5 720 – 1500
478.5 479 0.5 <500 – 800
479 480 1.0 <500
480 480.5 0.5 <500 – 4400
480.5 481 0.5 550 – 5100
481 481.5 0.5 520 – 5700
481.5 482 0.5 600 – 60000
482 482.5 0.5 <500 – 750
482.5 486 3.5 <500
489.5 490 0.5 <500
490 490.5 0.5 <500 – 630
490.5 491 0.5 <500 – 680
497 497.5 0.5 <500
497.5 498 0.5 <500 – 710
499 499.5 0.5 <500
510 511 1.0 <500
528 528.5 0.5 <500
528.5 529 0.5 <500 – 1400
529 529.5 0.5 700 – 14000
529.5 530 0.5 <500 – 7200
530 530.5 0.5 <500 – 3200
530.5 531 0.5 1000 – 5600
531 531.5 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.com ) 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 3, 2025 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.com 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/253463

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