NexGen Announces Best Ever Discovery-Phase Intercept At Rook I Property
NexGen Announces Best Ever Discovery-Phase Intercept At Rook I Property
• RK-25-232 intersects broad zone of intense mineralization including 3.9 m of >61,000 cps
• High-grade subdomain doubles in size to 210 m strike and 335 m vertical extent
• Represents best hole drilled at any NexGen property, including Arrow, during the
discovery-phase of exploration
Vancouver, BC, March 24, 2025 - NexGen Energy Ltd. ( "NexGen" or the "Company") (TSX: NXE)
(NYSE: NXE) (ASX: NXG) is excited to announce the best hole drilled to date, RK-25-232 (Figures 1 and
2). This hole has materially expanded the shallow inner high-grade subdomain at Patterson Corridor East
(PCE).
Drillhole RK-25-232 intersected 3.9 meters (“m”) of >61,000 cps, indicating rich uranium concentration
within a larger 13.8 m mineralized interval that starts at 452.2 m (Figures 3 and 4, Table 1). It is one of
the shallowest high-grade intersections at PCE and open in all directions (including 300 m up dip) within
the competent basement rock. Four additional winter drillholes all located a minimum 50 m from RK-25-232
have all encountered high-grade intercepts containing >61,000 cps (RK-25-227, -230, -233, -236)
expanding the high-grade subdomain to 210 m along strike and 335 m of vertical extent, doubling in size
since last reported in November 2024 (previously 100 m strike and 170 m vertical extent) . Ongoing
exploration will focus on growing and defining this high-grade zone from hole RK-25-232.
Leigh Curyer, Chief Executive Officer, commented: “ This intercept from RK -25-232 is geologically
exceptional and represents a transformational moment taking PCE into a category to rival Arrow at the same
stage of drilling . Discovering mineralization of this intensity so early in our 2025 program outpaces the
success pattern experienced at the Arrow Deposit. Incredible, considering Arrow’s status on the world
stage. To put this into context, the width of high-grade intense mineralization in RK-25-232 at PCE was first
encountered at Arrow well into the delineation phase of resource definition . Together with Arrow, i t’s
validation a very significant regional mineralizing event has occurred at Rook I that we are only just
beginning to assess the magnitude.
Today’s result comes at a time the need for Canada to optimize the development of its energy fuel resources
has never been more important. NexGen, Saskatchewan and our community partners are ready to
immediately commence construction of the Rook I Project subject to the completion of the CNSC approval
process.”
Jason Craven, Vice President, Exploration, commented: “Another exciting evaluation milestone has been
achieved by intersecting the surge of mineralization intensity in RK-25-232. Vein-type uranium is known to
have high-grade zones within broad, structurally controlled footprints. Our focus is to expand the high-grade
subdomain while also investigating for natural repetition within the evolving mineralized footprint, all of which
is very similar to the approach to Arrow’s resource development.”
The development of PCE has advanced quickly over the past year ; from an initial discovery of new vein-
type basement-hosted uranium in February 2024, to a rapidly growing mineralized footprint and expanding
high-grade, and now to a best-ever high-grade intersection in RK-25-232. An interpreted 3D model (Figures
1 and 2) provides a new visual representation of the scale and setting of the mineralization.
This is a Designated News Release
Reporting of assays from 2024 is expected in April once all results have been received and verified.
Figure 1: Interpreted model of mineralization at PCE (as of this release) and same exploration stage of the A2 shear
mineralization from Arrow (as of Spring 2015); both are shown on long sections that look perpendicular to their primary
mineralized planes; total mineralized footprint in orange and the high-grade subdomains in red; 2019 Feasibility Study
notes 174.2 Mlbs U3O8 measured and indicated hosted by final A2
Figure 2: Zoomed view of RK-25-232 and surrounding pierce points on the long section, significant space to be tested
in all directions
Figure 3: Core photo of mineralization from RK-25-232; off-scale high-grade mineralization is near continuous within an
overall vein width of 13.8 m from 452.2 to 466.0 m; yellow outlines >1,000 cps, red outlines >10,000 cps, purple outlines
>61,000 cps
Figure 4: Massive replacement by uranium mineralization at 460.6 m in RK -25-232; examples of this intense
mineralization style are spread throughout the high-grade subdomain
Table 1: 2025 Spectrometer results as of March 13
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-25-225 330 -70 684.0 108.6 475.00 475.5 0.5 <500
479.5 480.0 0.5 <500 - 1400
482.0 482.5 0.5 <500 - 850
482.5 483.0 0.5 <500
483.5 484.0 0.5 <500
484.0 484.5 0.5 <500
484.5 485.0 0.5 <500
498.5 499.0 0.5 <500 - 650
499.0 499.5 0.5 <500 - 830
509.0 509.5 0.5 <500 - 1300
509.5 510.0 0.5 <500
510.5 511.0 0.5 <500 - 750
511.0 511.5 0.5 <500 - 1800
517.5 518.0 0.5 <500
523.0 523.5 0.5 <500
523.5 524.0 0.5 <500
526.5 527.0 0.5 <500
539.0 539.5 0.5 <500
539.5 540.0 0.5 <500
540.0 540.5 0.5 <500
541.0 541.5 0.5 <500 - 1600
541.5 542.0 0.5 <500
RK-25-226 330 -70 655.5 N/A 539.0 539.5 0.5 <500
540.5 541.0 0.5 <500 - 550
578.5 579.0 0.5 <500
579.5 580.0 0.5 <500
580.0 580.5 0.5 <500 - 880
580.5 581.0 0.5 <500 - 510
582.0 582.5 0.5 <500
583.0 583.5 0.5 <500
583.5 584.0 0.5 <500 - 2200
584.0 584.5 0.5 <500 - 980
586.5 587.0 0.5 <500
587.0 587.5 0.5 <500
589.0 589.5 0.5 <500
589.5 590.0 0.5 <500
590.0 590.5 0.5 <500
590.5 591.0 0.5 <500 - 730
591.0 591.5 0.5 <500 - 720
591.5 592.0 0.5 <500
592.0 592.5 0.5 <500 - 1200
592.5 593.0 0.5 <500 - 1280
593.0 593.5 0.5 <500 - 1150
594.0 594.5 0.5 <500 - 890
594.5 595.0 0.5 <500
595.0 595.5 0.5 1000 - 5400
595.5 596.0 0.5 <500
596.0 596.5 0.5 <500
597.5 598.0 0.5 <500
598.0 598.5 0.5 <500 - 770
598.5 599.0 0.5 <500 - 1600
599.0 599.5 0.5 <500
599.5 600.0 0.5 <500 - 510
600.0 600.5 0.5 <500 - 710
602.0 602.5 0.5 <500
606.0 606.5 0.5 <500
RK-25-227 330 -70 657.0 113.4 493.0 493.5 0.5 <500
496.0 496.5 0.5 <500
496.5 497.0 0.5 <500
497.5 498.0 0.5 <500 - 950
498.0 498.5 0.5 <500
505.5 506.0 0.5 <500 - 650
506.0 506.5 0.5 <500 - 2300
506.5 507.0 0.5 <500 - 650
507.0 507.5 0.5 <500 - 1500
507.5 508.0 0.5 <500 - 1250
508.0 508.5 0.5 <500
508.5 509.0 0.5 <500 - 1400
509.0 509.5 0.5 <500 - 2500
509.5 510.0 0.5 <500
510.5 511.0 0.5 <500
511.0 511.5 0.5 <500
511.5 512.0 0.5 <500
512.5 513.0 0.5 <500
513.5 514.0 0.5 <500
514.0 514.5 0.5 <500
514.5 515.0 0.5 <500
515.0 515.5 0.5 <500 - 1600
515.5 516.0 0.5 <500
516.0 516.5 0.5 800 - 2000
516.5 517.0 0.5 600 - 2000
517.0 517.5 0.5 700 - 3000
517.5 518.0 0.5 1200 - 5700
518.0 518.5 0.5 1500 - 4500
518.5 519.0 0.5 1000 - 4500
519.0 519.5 0.5 <500 - 1500
519.5 520.0 0.5 <500 - 800
520.0 520.5 0.5 1000 - 14000
520.5 521.0 0.5 500 - 1300
521.0 521.5 0.5 1000 - 3000
521.5 522.0 0.5 800 - 3000
522.0 522.5 0.5 1500 - 5000
522.5 523.0 0.5 <500 - 4000
523.0 523.5 0.5 <500 - 600
523.5 524.0 0.5 <500 - 900
524.0 524.5 0.5 <500
533.0 533.5 0.5 <500
533.5 534.0 0.5 <500 - 1200
534.0 534.5 0.5 1200 - 1200
534.5 535.0 0.5 700 - 950
535.0 535.5 0.5 950- 1600
535.5 536.0 0.5 1200 - 4200
536.0 536.5 0.5 1200 - 6100
536.5 537.0 0.5 600 - 1600
537.0 537.5 0.5 3000 - 14000
537.5 538.0 0.5 >61000
538.0 538.1 0.1 45000 - 55000
538.1 538.5 0.4 >61000
538.5 539.0 0.5 850 - 6500
539.0 539.1 0.1 900 - 1200
539.1 539.2 0.1 25000 - 55000
539.2 539.5 0.3 20000 - 37000
539.5 539.6 0.1 >61000
539.6 539.7 0.1 25000 - 55000
539.7 540.0 0.3 >61000
540.0 540.5 0.5 1700 - 6500
540.5 541.0 0.5 800- 1400
541.0 541.5 0.5 <500 - 900
541.5 542.0 0.5 <500
542.0 542.5 0.5 <500 - 1200
542.5 543.0 0.5 <500 - 1200
543.0 543.5 0.5 <500 - 1600
544.0 544.5 0.5 600 - 3800
544.5 545.0 0.5 <500 - 9400
545.0 545.5 0.5 <500
552.0 552.5 0.5 <500 - 1500
552.5 553.0 0.5 <500 - 700
553.0 553.5 0.5 <500
562.0 562.5 0.5 <500
562.5 563.0 0.5 <500 - 600
563.0 563.5 0.5 <500
563.5 564.0 0.5 <500
RK-25-228 330 -75 609.0 117.1 493.0 493.5 0.5 <500
494.5 495.0 0.5 <500 - 800
495.5 496.0 0.5 <500
508.0 508.5 0.5 <500
537.5 538.0 0.5 <500 - 700
545.5 546.0 0.5 <500 - 3000
561.5 562.0 0.5 <500
562.0 562.5 0.5 <500
RK-25-229 350 -70 681.4 113.2 570.0 570.5 0.5 <500
570.5 571.0 0.5 <500
571.0 571.5 0.5 <500
573.5 574.0 0.5 <500
576.5 577.0 0.5 <500
578.0 578.5 0.5 <500
578.5 579.0 0.5 <500 - 700
582.0 582.5 0.5 <500 - 600
606.5 607.0 0.5 <500 - 30000
607.0 607.5 0.5 <500 - 19000
607.5 608.0 0.5 <500 - 3400
622.5 623.0 0.5 <500 - 2200
623.0 623.5 0.5 <500 - 1400
633.5 634.0 0.5 <500
636.5 637.0 0.5 <500 - 3700
RK-25-230 330 -70 598.0 112.5 441.5 442.0 0.5 <500- 6700
442.0 442.5 0.5 <500 - 1800
442.5 443.0 0.5 <500 - 640
443.0 443.5 0.5 <500 - 640
446.5 447.0 0.5 <500
447.0 447.5 0.5 <500 - 720
447.5 448.0 0.5 <500 - 1400
448.0 448.5 0.5 <500 - 1800
448.5 449.0 0.5 <500 - 620
475.0 475.5 0.5 <500
475.5 476.0 0.5 <500 - 1700
476.0 476.5 0.5 <500 - 1660
476.5 477.0 0.5 <500 - 580
477.0 477.5 0.5 <500 - 1050
477.5 478.0 0.5 <500 - 540
478.0 478.5 0.5 <500 - 1080
479.0 479.5 0.5 <500 - 710
479.5 480.0 0.5 <500
480.0 480.5 0.5 <500
480.5 481.0 0.5 <500
481.0 481.5 0.5 <500 - 860
481.5 482.0 0.5 <500 - 1820
482.0 482.5 0.5 <500 - 1100
482.5 483.0 0.5 <500 - 2700
483.0 483.5 0.5 <500 - 10000
483.5 484.0 0.5 <500 - 520
484.0 484.5 0.5 <500
484.5 485.0 0.5 <500 - 1360
485.0 485.5 0.5 <500 - 1350
485.5 486.0 0.5 680 - 3400
486.0 486.5 0.5 540 - 2500
486.5 487.0 0.5 <500
487.0 487.5 0.5 <500 - 4420
487.5 488.0 0.5 740 - 7800
488.0 488.5 0.5 <500 - 8000
488.5 489.0 0.5 <500 - 2300
489.0 489.5 0.5 730 - 1900
489.5 490.0 0.5 820 - 7550
490.0 490.5 0.5 <500 - 1250
490.5 491.0 0.5 <500
491.0 491.5 0.5 <500
491.5 492.0 0.5 <500
492.0 492.5 0.5 <500
492.5 493.0 0.5 <500 - 1140
493.0 493.2 0.2 >61000
493.2 493.4 0.2 8000 - 28000
493.4 493.5 0.1 >61000
493.5 494.0 0.5 <500 - 31000
494.0 494.5 0.5 <500 - 5100
494.5 495.0 0.5 <500 - 1160
495.0 495.5 0.5 2200 - 2200
495.5 496.0 0.5 <500 - 1650
496.0 496.5 0.5 <500 - 3700
496.5 497.0 0.5 1400 - 2600