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NexGen Announces Best Ever Discovery-Phase Intercept At Rook I Property

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  • 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 /PRNewswire/ - 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, it'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.

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 (CNW Group/NexGen Energy Ltd.)

Figure 2: Zoomed view of RK-25-232 and surrounding pierce points on the long section, significant space to be tested in all directions (CNW Group/NexGen Energy Ltd.)

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 (CNW Group/NexGen Energy Ltd.)

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 (CNW Group/NexGen Energy Ltd.)

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






497.0

497.5

0.5

 <500 - 4500






497.5

497.7

0.2

540 - 1100






497.7

498.0

0.3

>61000






498.0

498.5

0.5

1200 - 44000






498.5

498.7

0.2

>61000






498.7

499.0

0.3

5200 - 24000






499.0

499.5

0.5

540 - 8000






499.5

500.0

0.5

 <500 - 680

RK-25-231

329

-69.5

885.0

102.7

677.0

677.5

0.5

 <500 - 920






683.0

683.5

0.5

 <500 -1200






683.5

684.0

0.5

 <500 - 1500






684.0

684.5

0.5

580 - 1000






685.0

685.5

0.5

 <500






686.0

686.5

0.5

 <500






686.5

687.0

0.5

 <500 - 4000






687.0

687.5

0.5

 <500






687.5

688.0

0.5

 <500 - 6700






688.0

688.5

0.5

 <500 - 20000






689.0

689.5

0.5

 <500 - 6000






689.5

690.0

0.5

 <500 - 1000






690.0

690.5

0.5

 <500 - 2200






692.5

693.0

0.5

 <500 - 3600






693.0

693.5

0.5

 <500 - 4800






693.5

694.0

0.5

700 - 8100






694.0

694.5

0.5

4200 - 31000






694.5

695.0

0.5

 <500 - 11000






695.0

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