NexGen Announces New Significant High Grade Assay Results at Patterson Corridor East
NexGen Announces New Significant High Grade Assay Results at Patterson Corridor East
Vancouver, BC, November 12, 2025, NexGen Energy Ltd. ("NexGen" or the "Company") ( TSX: NXE)
(NYSE: NXE) (ASX: NXG ) is excited to announce significant geochemical assay results from NexGen’s
100%-owned Patterson Corridor East (“PCE”) discovery.
Drillhole RK-25-254 returned 10.5 meters (“m”) at 11.3% U3O8 including 4.0m at 29.4 % U3O8
and 0.5m at 56.2% U3O8 (Figures 1 and 2, Table 1). Notably, mineralization in RK-25-254 is 55m
up dip from hole RK-25-232 which intersected 15.0m at 15.9% U 3O8 including 3.0m at 47.8%
U3O8, 1.5m at 29.4% U 3O8 and an intercept of 0.5m at 68.8% U 3O8 (see May 27, 2025 news
release).
Drillhole RK-25-244, 19m down dip of RK-25-232, returned equally strong results, 17.0m at 7.6%
U3O8 including 6.0m at 21.1% U3O8 and 0.5m at 58.1% U3O8 (Figures 1 and 3, Table 1).
Additional assay results contained in this release, confirm strong continuity of the high- grade
subdomain (Figure 1, Table 1) over 330m in vertical extent from RK-25-246 to RK-25-231. Further, RK-
25-231 (8.0m at 1.4% U3O8) and -241 (8.5m at 1.3% U 3O8) demonstrate the continuity of the subdomain
and add breadth while indicating extended high- grade potential. A secondary high-grade subdomain is
currently interpreted from results in RK-25-234, with 0.5m at 8.3% U3O8 that lies along a potential new high-
grade shoot.
Note, a dditional assay results from drillhole RK-25-256, which intersected intense high- grade
mineralization 128m down dip of RK -25-232 and 179m from RK -25-254, are pending and will be
released with further assays as they are received back from the independent lab .
PCE drilling has delivered significant advancements of a discovery that is characteristic of the southwest
Athabasca Basin district, of which NexGen holds a 190,000 hectare land package . This setting has an
identical technical advantage as the nearby Arrow deposit, 3.5 kilometers (“ km”) west of PCE , as
mineralization is fully hosted in competent basement rock with dimensions that are expanding rapidly since
initial discovery in February 2024. The overall mineralized footprint is currently defined as 600m along
strike and 600m of vertical extent, with a high-grade subdomain of 210m in strike and 335m in vertical
extent.
Leigh Curyer, Chief Executive Officer, commented: “ Today’s assay results from PCE represent further
validation of this new discovery. The PCE discovery and drilling program is the same bold, wide spaced ,
safe and cost effective approach that defined the world class Arrow deposit and is delivering results of the
same calibre. It’s so exciting to be in the midst of another significant discovery.
From our world-class Arrow deposit in its final stages of Federal approvals, to PCE growing into an additional
project on its own merits 3.5km east of Arrow, the NexGen team continues to de liver unparalleled and
increasing leverage to the world uranium market for the coming decades. NexGen is ideally positioned for
North America’s critical mineral and energy security strategy, while exemplifying elite standards in
environmental performance and social engagement.”
Jason Craven, Vice President, Exploration, commented: “ NexGen has execut ed with a systematic and
impactful approach to advance PCE since discovery in February 2024. Importantly, not only are we seeing
world-class uranium grades over significant widths, but also the continuity of that mineralization is incredibly
strong. The repeatability of consistent high- grade results at PCE, with so much untested area remaining
highlights the significant potential for continued expansion.
After more than 20 years exploring for uranium in the Basin, I never imagined I’d get the chance to work on
a project like Arrow — something that was thought to be impossible prior to NexGen. To now find ourselves
at the early stages of another discovery with similar characteristics and growing potential is both remarkable
and deeply humbling.”
Figure 1: Interpreted PCE long section (as of last release on August 28, 2025) with notable assays collected since
discovery and new results outlined in red; view is a long section that looks perpendicular to the primary mineralized
plane; total mineralized footprint in orange and the high-grade subdomains in red
Figure 2: Core photo with assays from RK-25-254, grades are shown as % U3O8
Figure 3: Core photo with assays from RK-25-244, grades are shown as % U3O8
Table 1: Assays received since July 29, 2025 news release
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-25-229 350 -70 681.4 113.2 Assays Pending*
RK-25-230 330 -70 598 112.5 Assays Pending*
RK-25-231 329 -69.5 885 102.7 677 677.5 0.5 0.03
683 685.5 2.5 0.07
686 687 1 0.12
687.5 688.5 1 1.16
689 690.5 1.5 0.16
692.5 700.5 8 1.42
incl. 694 699 5 2.12
701 702 1 0.02
706.5 710.5 4 0.57
incl. 706.5 707 0.5 1.24
incl. 708 709 1 1.53
712 712.5 0.5 0.02
713 714 1 0.03
716 717 1 0.20
725.5 726 0.5 0.26
729.5 730.5 1 0.05
731.5 732.5 1 0.08
734 734.5 0.5 0.19
768.5 769 0.5 0.01
769.5 770 0.5 0.02
772 772.5 0.5 0.15
775 776.5 1.5 0.02
780.5 781.5 1 0.62
incl. 780.5 781 0.5 1.07
791 792 1 0.04
792.5 794.5 2 0.42
RK-25-233 330 -70 694 109.7 Assays Pending*
RK-25-234 330 -70 747 113 672 673.5 1.5 0.04
675 675.5 0.5 0.01
677 678.5 1.5 0.02
687 688.5 1.5 3.02
incl. 687.5 688 0.5 8.33
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 -71 534 117.2 396 396.5 0.5 0.04
413.5 419.5 6 0.31
incl. 418 418.5 0.5 1.12
424 424.5 0.5 0.13
425 426 1 0.06
427.5 428 0.5 0.01
428.5 429.5 1 0.02
430.5 431 0.5 0.01
432 432.5 0.5 0.02
434 439.5 5.5 0.04
440 440.5 0.5 0.06
444 444.5 0.5 0.09
448.5 457 8.5 1.27
incl. 449 450.5 1.5 5.79
incl. 449.0 449.5 0.5 10.2
462.5 465.5 3 0.07
466 466.5 0.5 0.02
467 467.5 0.5 0.04
468 468.5 0.5 0.01
469.5 470 0.5 0.01
495 495.5 0.5 0.01
496 496.5 0.5 0.02
497.5 498.5 1 0.05
501 501.5 0.5 0.10
503 503.5 0.5 0.07
RK-25-242 270 -70 555 124.5 No Significant Intersections
RK-25-243 276 -66 579 126.8 Assays Pending*
RK-25-244 330 -70 586.6 112.4 410 411 1 0.01
412 413.5 1.5 0.31
414 415.5 1.5 0.02
421 425 4 0.06
428 429 1 0.18
430 430.5 0.5 0.03
434 434.5 0.5 0.01
445.5 446 0.5 0.01
453.5 456 2.5 0.03
456.5 460 3.5 0.04
462 479 17 7.63
incl. 472 478 6 21.1
incl. 475.5 476 0.5 58.1
480 483.5 3.5 0.76
incl. 481.5 482 0.5 4.22
489.5 491 1.5 0.05
492 492.5 0.5 0.01
497 498 1 0.03
499 499.5 0.5 0.02
510 511 1 0.12
528 531.5 3.5 0.64
incl. 529 530 1 1.38
RK-25-245 330 -70 744.0 111.5 693 694 1 0.01
695 696.5 1.5 0.04
707 707.5 0.5 0.09
724 724.5 0.5 0.25
725 725.5 0.5 0.03
RK-25-246 270 -70 525.0 124.5 332 332.5 0.5 0.02
333 334 1 0.02
337 344 7 0.08
367 370 3 0.01
375.5 397.5 22 0.38
incl. 379.5 385 5.5 1.06
398 401 3 0.09
402 405.5 3.5 0.20
423 426 3 0.03
444.5 447 2.5 0.02
447.5 448.5 1 0.02
450.5 451 0.5 0.02
451.5 452 0.5 0.01
453 453.5 0.5 0.02
456.5 457 0.5 0.01
458 458.5 0.5 0.03
460.5 462 1.5 0.13
479 480 1 0.14
488.5 489.5 1 0.04
RK-25-247 330 -70 738.0 114.4 Assays Pending*
RK-25-248 283 -69 501.0 123.3 Assays Pending
RK-25-249 340 -70 681.0 106.1 Assays Pending*
RK-25-250 308 -70 726.0 114.8 Assays Pending*
RK-25-251 302 -69 576.3 119.6 Assays Pending*
RK-25-252 275 -68 663.0 120.8 Assays Pending*
RK-25-253 340 -70 657.0 116.8 No Significant Intersections
RK-25-254 275 -65 582.0 128.0 404.5 405.5 1 0.02
406 406.5 0.5 0.02
407 407.5 0.5 0.01
408.5 409 0.5 0.02
409.5 410 0.5 0.02
410.5 411 0.5 0.02
418.5 419.5 1 0.03
430 430.5 0.5 0.02
433 433.5 0.5 0.01
434.5 435 0.5 0.02
435.5 436 0.5 0.01
437 437.5 0.5 0.02
438 440 2 0.02
440.5 441 0.5 0.01
442 443.5 1.5 0.01
444 444.5 0.5 0.02
445.5 446 0.5 0.02
447 447.5 0.5 0.01
449 459.5 10.5 11.3
incl. 454 458 4 29.4
incl. 456.5 457 0.5 56.2
462 463 1 0.04
463.5 464 0.5 0.01
475.5 477 1.5 0.01
478.5 479 0.5 0.02
480 481.5 1.5 0.03
483 485 2 0.13
485.5 487 1.5 0.05
488 488.5 0.5 0.09
489 491.5 2.5 0.04
505 507.5 2.5 0.14
509 509.5 0.5 0.01
522 522.5 0.5 0.14
536.5 538.5 2 0.25
541.5 542 0.5 0.33
RK-25-254c1 275 -65 564.0 N/A Assays Pending*
RK-25-254c2 275 -65 553.5 - Assays Pending*
RK-25-255 4 -70 950.4 112.7 Assays Pending*
RK-25-256 292 -65.5 696.0 116.9 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.
• * Denotes results that correlate to high-grade levels of radioactivity (>10,000 cps)
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
www.nexgenenergy.ca
Travis McPherson
Chief Commercial Officer
NexGen Energy Ltd.
+1 604 428 4112
www.nexgenenergy.ca
Monica Kras
Vice President, Corporate Development
NexGen Energy Ltd.
+44 7307 191933
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.sedar.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