NexGen Announces Best Assays from Patterson Corridor East in Hole RK-25-232
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, BC, May 27, 2025 - NexGen Energy Ltd. ("NexGen" or the "Company") (TSX: NXE) (NYSE:
NXE) (ASX: NXG ) 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.
This is a Designated News Release
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 a ssays 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.
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