Dryden Gold

NexGen Energy Announces Best Hole to Date (RK-24-222) and High-Grade Expansion at Patterson Corridor East Concluding a Successful 2024 Drilling Program

  • NexGen's 2024 exploration campaign delivered a new discovery on Rook I at Patterson Corridor East ("PCE") 3.5km east of Arrow.
  • Subsequent drilling has materially expanded the mineralized zone to 600 m strike length and 600 m vertical extent with 19 of 30 holes intersecting mineralization including 10 holes with multiple intervals >10,000 cps.
  • Today's announcement highlights the best hole to date at PCE (RK-24-222) returns 17.0 m wide vein with multiple high intensity (>61,000 cps) occurrences.
  • In 2024, PCE is the largest drill program in the Athabasca Basin by any Company at 34,000 meters (m).

VANCOUVER, BC, Nov. 12, 2024 /PRNewswire/ - NexGen Energy Ltd. ("NexGen" or the "Company") (TSX: NXE) (NYSE: NXE) (ASX: NXG) is proud to announce the completion of its 2024 drilling campaign at Patterson Corridor East (PCE) that included more than 34,000 m across a total of 46 drillholes. Upon initial discovery of intense uranium mineralization at PCE (see March 11 News Release), the Company directed all drilling activity to focus exclusively on PCE, whereby 19 of 30 holes intersected mineralization. Bold and systematic spacing of drillhole intercepts have quickly grown the discovery from a single hole to a broad and continuous new uranium discovery. Real-time evaluation of results throughout the duration of the program focused on determining the overall outer extents of the mineralized zone and in parallel, precisely targeting high-grade sub-domains (Figures 1 and 2, Table 1).

In late October, a high-grade portion has presented itself within the overall mineralized zone with upgraded intensity of mineralization in the now best hole to date, RK-24-222 (Figure 3). A 17.0 m wide vein with multiple occurrences of off-scale (>61,000 cps) mineralization (Table1, Figure 3). In addition, RK-24-220 and -223 intersected strong mineralization up to 41,000 cps and 40,000 cps, respectively including multiple intercepts of >10,000 cps.  System strength is confirmed by these zones characterized by semi-massive to massive replacement by uraninite. A high-grade sub-domain of the mineralized footprint now covers 100 m of strike and 170 m of depth extent with potential growth in all directions (Figure 2). The high-grade intersection in RK-24-222 represents the fifth drillhole at PCE to return off-scale (>61,000 cps) mineralization, joining previous significant intersections in RK-24-183, -197, -202, and -207.

Leigh Curyer, Chief Executive Officer, commented: "This focused effort has elevated the materiality of PCE and today's results highlight the increasing potential of the PCE system with RK-24-222. With 600 m of strike length and 600 m of depth extent, this new zone located entirely within competent basement rock only 3.5 km from the flagship world-class Arrow deposit has emerged as a compelling and prospective addition to NexGen's dominant portfolio in the south western section of the Athabasca Basin.

NexGen's disciplined dual focus on the advancement of the Rook I Project and the expanded exploration at PCE demonstrates the Company's commitment to unlocking the full potential of this major uranium district at a time where the need for clean affordable safe baseload energy has never been more evident. With the world's leading tech companies all committing to nuclear power in recent month's the outlook is incredibly exciting in the nuclear fuel space."

Assays from disclosed intersections are expected in Q4 2024 and Q1 2025, with reporting to follow.  Exploration activity will resume in January 2025 with planning underway for a significant drill program at PCE where the prospectivity for material growth is clearly evident.  

Figure 1: Map view of PCE target area with the mineralized footprint wireframe shown in red; as of November 11, 2024 (CNW Group/NexGen Energy Ltd.)

Figure 2: Schematic long section comparison from mid-summer 2024 to November 2024 of mineralized footprint at PCE; additional drilling has maintained internal continuity with modest expansion in most directions (CNW Group/NexGen Energy Ltd.)

Figure 3: Core photo from RK-24-222; high-grade mineralization is hosted near continuously within an overall vein width of 17.0 m from 604.5 to 621.5 m with a secondary vein below from 623.0 to 626.0 m; yellow outlines >1,000 cps while red outlines >10,000 cps (CNW Group/NexGen Energy Ltd.)

Figure 4: RK-24-222 close-up of off-scale (>61,000 cps) massive replacement by uraninite haloed by hematite at 607.4 m (CNW Group/NexGen Energy Ltd.)

Figure 5: RK-24-222 semi-massive replacement by uraninite accompanied by argillization and hematite at 618.5 m, max peak of >61,000 cps (CNW Group/NexGen Energy Ltd.)

Table 1: 2024 Spectrometer results since previous release on August 8, 2024

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-24-208

310

-70

756

104.3

435

435.5

0.5

<500

         

435.5

436

0.5

<500 - 710

         

522

522.5

0.5

<500

         

523

523.5

0.5

<500

         

655

655.5

0.5

<500 - 750

         

655.5

656

0.5

<500

         

657.5

658

0.5

<500

         

658.5

659

0.5

<500

         

665.5

666

0.5

<500

         

666

666.5

0.5

<500 - 610

         

669.5

670.5

1

<500

         

670.5

671

0.5

560 - 950

         

671

671.5

0.5

1400 - 3560

         

673

673.5

0.5

<500 - 690

         

673.5

674

0.5

500 - 1140

         

674

675

1

<500

         

680

681

1

<500

         

685.5

686

0.5

<500 - 600

         

686.5

687

0.5

600 - 800

         

687

687.5

0.5

900 - 3000

         

687.5

688

0.5

<500 - 3000

         

689

689.5

0.5

<500 - 500

         

689.5

690

0.5

1300 - 5700

         

690

690.5

0.5

<500 - 2400

         

690.5

691

0.5

<500

         

691.5

692

0.5

<500 - 1800

         

692

692.5

0.5

<500 - 1600

         

692.5

693

0.5

<500

         

693

693.5

0.5

<500 - 1300

         

693.5

694

0.5

<500 - 500

         

694

694.5

0.5

<500 - 610

         

694.5

695

0.5

<500 - 600

         

695

695.5

0.5

550 - 1500

         

695.5

696

0.5

<500 - 3500

         

696

696.5

0.5

<500 - 810

         

697.5

698.5

1

<500

RK-24-209

310

-70

840

110.7

395

396

1

<500

         

627.5

628

0.5

<500 - 510

         

695

695.5

0.5

<500

         

759

759.5

0.5

<500 - 600

RK-24-210

310

-70

1095

102.4

639

639.5

0.5

<500

         

639.5

640

0.5

<500 - 510

         

640

640.5

0.5

<500

         

854

854.5

0.5

<500 - 700

         

854.5

855

0.5

<500

         

855.5

856

0.5

<500 - 1600

         

856

856.5

0.5

<500 - 1800

         

857.5

858

0.5

<500

         

858

858.5

0.5

<500 - 1600

         

862

862.5

0.5

<500 - 950

         

863.5

864

0.5

<500 - 700

         

869

869.5

0.5

<500 - 600

         

869.5

870

0.5

<500 - 500

         

874.5

875

0.5

<500 - 550

         

875.5

876

0.5

<500 - 3800

         

876

876.5

0.5

2700 - 6500

         

876.5

877

0.5

<500 - 1100

         

877

879

2

<500

         

879

879.5

0.5

<500 - 1200

         

879.5

880

0.5

<500 - 700

         

880

880.5

0.5

<500 - 750

         

880.5

881

0.5

600 - 1200

         

881

881.5

0.5

<500 - 600

         

881.5

882

0.5

<500 - 900

         

882

882.5

0.5

<500 - 1500

         

882.5

883

0.5

800 - 3400

         

883

883.5

0.5

<500 - 520

         

884.5

885

0.5

<500

         

885.5

886

0.5

<500 - 600

         

886

886.5

0.5

<500 - 1100

         

886.5

887

0.5

<500 - 1600

         

888

888.5

0.5

<500

         

888.5

889

0.5

<500 - 900

         

915.5

916.5

1

<500

         

920

920.5

0.5

<500 - 500

         

921

921.5

0.5

<500 - 700

         

921.5

922

0.5

<500

RK-24-211

310

-70

1302

103.1

776.5

777

0.5

<500

         

784

784.5

0.5

<500

         

1116.5

1117

0.5

<500

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

463

463.5

0.5

<500

         

466.5

467

0.5

<500

         

859.5

860

0.5

<500

         

862.5

863.5

1

<500

         

863.5

864

0.5

<500 - 950

         

865

865.5

0.5

<500

         

865.5

866

0.5

<500 - 540

         

866

866.5

0.5

<500 - 1400

         

867.5

868

0.5

<500

         

868

868.5

0.5

<500 - 650

         

868.5

869

0.5

<500 - 2200

         

869.5

870

0.5

<500

RK-24-215

310

-70

840

114.8

542

542.5

0.5

600 - 1300

         

542.5

543

0.5

2200 - 3200

         

543

543.5

0.5

6000 - 11000

         

543.5

544

0.5

<500 - 5000

         

544

544.5

0.5

<500 - 700

         

544.5

545

0.5

600 - 3500

         

545

545.5

0.5

500 - 1800

         

545.5

546

0.5

<500 - 700

         

546

546.5

0.5

<500 - 1400

         

546.5

547

0.5

<500 - 1150

         

547

547.5

0.5

<500

         

551.5

552

0.5

<500 - 1700

         

552

553.5

1.5

<500

         

564.5

565

0.5

<500 - 700

         

570

570.5

0.5

<500

         

570.5

571

0.5

<500 - 800

         

571

571.5

0.5

<500

         

571.5

572

0.5

<500 - 600

         

572

572.5

0.5

<500

         

583.5

584

0.5

<500

         

584.5

585

0.5

<500

         

585

585.5

0.5

600 - 1500

         

585.5

586

0.5

<500 - 550

         

586

586.5

0.5

<500 - 700

         

586.5

587

0.5

<500 - 800

         

587

588

1

<500

         

588

588.5

0.5

600 - 2000

         

588.5

589

0.5

700 - 2100

         

589

589.5

0.5

<500 - 1300

         

589.5

590

0.5

1200 - 1500

         

590.5

591

0.5

<500

         

600

600.5

0.5

<500 - 500

         

604.5

605

0.5

<500

         

608.5

609

0.5

<500

         

609

609.5

0.5

800 - 2850

         

609.5

610

0.5

<500

         

610

610.5

0.5

<500 - 850

         

621.5

622

0.5

<500 - 1500

         

622

622.5

0.5

<500 - 700

         

643

643.5

0.5

<500

         

646

646.5

0.5

<500 - 700

         

646.5

647

0.5

<500 - 1300

         

647

647.5

0.5

<500 - 2500

         

647.5

648

0.5

<500 - 700

         

648

649

1

<500

         

657

657.5

0.5

<500 - 1200

         

658

658.5

0.5

<500 - 500

         

658.5

659

0.5

<500 - 500

         

659

659.5

0.5

<500 - 1950

         

665.5

666

0.5

<500 - 600

         

681

681.5

0.5

<500 - 900

         

681.5

682

0.5

<500 - 850

RK-24-216

310

-70

1071

99.7

787

787.5

0.5

<500 - 600

         

787.5

788

0.5

1100 - 3700

         

788

788.5

0.5

800 - 1200

         

788.5

789

0.5

<500

         

789.5

790

0.5

<500 - 700

         

790

790.5

0.5

<500 - 700

         

790.5

791

0.5

<500

         

791.5

792

0.5

<500 - 550

         

805

805.5

0.5

<500 - 740

         

805.5

806

0.5

<500

         

807.5

808.5

1

<500

         

811.5

812

0.5

<500 - 5800

         

815

815.5

0.5

<500 - 760

         

815.5

816

0.5

<500 - 700

         

819

820

1

<500

RK-24-217

310

-70

1185

105.6

519

520

1

<500

         

528.5

529

0.5

<500

         

709

710

1

<500

RK-24-217a

310

-70

120

105.1

No Significant Intersections

RK-24-218

310

-70

696

109.6

325.5

326

0.5

<500 - 830

         

424.5

425

0.5

<500 - 550

         

425.5

426

0.5

<500

         

463.5

464

0.5

<500 - 520

         

494.5

495

0.5

<500 - 550

         

515.5

516

0.5

<500

         

516

516.5

0.5

<500 - 700

         

516.5

517

0.5

<500 - 1200

         

517

517.5

0.5

500 - 4300

         

517.5

518

0.5

<500 - 1200

         

518

518.5

0.5

1000 - 2000

         

518.5

519

0.5

<500 - 1000

RK-24-219

310

-70

1187

99.8

758.5

759

0.5

<500 - 1050

         

759.5

760

0.5

<500 - 1100

         

897.5

898

0.5

<500

         

982

982.5

0.5

<500 - 570

RK-24-220

310

-70

732

116

387

387.5

0.5

<500

         

445.5

446

0.5

<500 - 510

         

446

446.5

0.5

<500 - 660

         

446.5

447

0.5

<500

         

452

452.5

0.5

<500 - 2400

         

452.5

453

0.5

<500 - 2000

         

453

454.5

1.5

<500

         

454.5

455

0.5

<500 - 650

         

455.5

456

0.5

<500 - 1700

         

456

456.5

0.5

600 - 1300

         

456.5

457

0.5

<500 - 1200

         

457

457.5

0.5

700 - 27000

         

457.5

458

0.5

1700 - 41000

         

459.5

460

0.5

<500 - 550

         

460

461

1

<500

         

461

461.5

0.5

<500 - 7000

         

461.5

462

0.5

<500 - 6000

         

462

462.5

0.5

740 - 2000

         

462.5

463

0.5

3500 - 4500

         

463

463.5

0.5

1300 - 6000

         

463.5

464

0.5

600 - 6500

         

464

464.5

0.5

600 - 2000

         

464.5

465

0.5

700 - 4000

         

465

465.5

0.5

<500 - 5600

         

465.5

466

0.5

1200 - 8200

         

466

466.5

0.5

<500 - 6000

         

477.5

478

0.5

<500 - 750

         

478

478.5

0.5

<500 - 800

         

479

479.5

0.5

<500

         

479.5

480

0.5

<500 - 800

         

480

480.5

0.5

<500 - 680

         

480.5

481

0.5

680 - 1300

         

481

481.5

0.5

<500 - 600

         

481.5

482

0.5

<500

         

482

482.5

0.5

<500 - 520

         

482.5

483

0.5

<500 - 520

         

483

483.5

0.5

<500

         

483.5

484

0.5

<500 - 800

         

484

484.5

0.5

<500 - 1100

         

484.5

485

0.5

<500 - 16000

         

485

485.5

0.5

3000 - 16000

         

485.5

486

0.5

<500 - 7000

         

486

486.5

0.5

<500 - 13000

         

486.5

487

0.5

<500 - 1200

         

487

488

1

<500

         

489

489.5

0.5

<500 - 640

         

489.5

490

0.5

<500 - 950

         

490

490.5

0.5

<500 - 800

         

490.5

491

0.5

<500 - 2100

         

491

491.5

0.5

<500 - 6000

         

491.5

492

0.5

<500 - 840

         

495

495.5

0.5

<500

         

495.5

496

0.5

<500 - 6800

         

496

496.5

0.5

<500 - 4100

         

496.5

497

0.5

<500 - 6000

         

497

497.5

0.5

2600 - 2600

         

497.5

498

0.5

<500 - 500

         

498

498.5

0.5

<500 - 1800

         

498.5

499

0.5

<500

         

503

503.5

0.5

<500 - 1500

         

503.5

504.5

1

<500

         

525.5

526

0.5

<500

         

539

539.5

0.5

<500

         

539.5

540

0.5

540 - 7300

         

570.5

571

0.5

<500 - 730

         

579.5

580

0.5

<500

         

580

580.5

0.5

<500 - 510

         

580.5

581

0.5

<500 - 520

         

583

583.5

0.5

<500

         

583.5

584

0.5

<500 - 1500

         

584

584.5

0.5

<500 - 620

         

596.5

597

0.5

<500 - 1300

         

597

597.5

0.5

<500 - 1300

         

599.5

600

0.5

<500

RK-24-221

310

-70

861.6

115.9

302

302.5

0.5

<500

         

302.5

303

0.5

<500 - 600

         

303

303.5

0.5

<500 - 830

         

594.5

595

0.5

<500

         

595

595.5

0.5

<500 - 1700

         

597.5

598

0.5

<500 - 5500

         

599

599.5

0.5

<500 - 2700

         

642

642.5

0.5

<500

         

642.5

643

0.5

<500 - 520

         

643

643.5

0.5

<500 - 1100

         

644

644.5

0.5

<500

         

650.5

651

0.5

<500 - 670

         

697.5

698

0.5

<500

         

698

698.5

0.5

<500 - 2300

RK-24-222

354

-65

753

108.4

588

588.5

0.5

770 - 1200

         

598

599.5

1.5

<500

         

602.5

603

0.5

<500 - 820

         

603

603.5

0.5

640 - 2000

         

603.5

604.5

1

<500

         

604.5

605

0.5

3000 - 20000

         

605

605.5

0.5

5800 - 17000

         

605.5

605.6

0.1

18000 - 60000

         

605.6

605.7

0.1

>61000

         

605.7

606

0.3

9000 - 60000

         

606

606.5

0.5

1800 - 10000

         

606.5

607

0.5

<500 - 730

         

607

607.4

0.4

3000 - 60000

         

607.4

607.8

0.4

>61000

         

607.8

608

0.2

5000 - 60000

         

608

608.2

0.2

16000 - 60000

         

608.2

608.4

0.2

>61000

         

608.4

608.5

0.1

10000 - 60000

         

608.5

609

0.5

6400 - 42000

         

609

609.5

0.5

10000 - 25000

         

609.5

610

0.5

7000 - 25000

         

610

610.5

0.5

<500 - 6000

         

610.5

610.9

0.4

7000 - 60000

         

610.9

611

0.1

>61000

         

611

611.5

0.5

4000 - 26000

         

611.5

612

0.5

3000 - 10000

         

612

612.5

0.5

700 - 3000

         

612.5

613

0.5

3000 - 7000

         

613

613.5

0.5

700 - 6000

         

613.5

614

0.5

2000 - 33000

         

614

614.5

0.5

900 - 6000

         

614.5

615

0.5

1900 - 39000

         

615

615.5

0.5

580 - 15000

         

615.5

616

0.5

500 - 5000

         

616

616.5

0.5

900 - 7500

         

616.5

617

0.5

900 - 25000

         

617

617.5

0.5

2800 - 14000

         

617.5

618

0.5

1100 - 3500

         

618

618.4

0.4

1300 - 60000

         

618.4

618.5

0.1

>61000

         

618.5

619

0.5

15000 - 31000

         

619

619.5

0.5

9800 - 39000

         

619.5

620

0.5

3400 - 14500

         

620

620.5

0.5

1800 - 24000

         

620.5

621

0.5

2500 - 25000

         

621

621.5

0.5

<500 - 2800

         

622

622.5

0.5

<500 - 580

         

622.5

623

0.5

<500 - 800

         

623

623.5

0.5

550 - 18000

         

623.5

624

0.5

500 - 1400

         

624

624.5

0.5

<500 - 700

         

624.5

625

0.5

<500 - 10000

         

625

625.4

0.4

500 - 60000

         

625.4

625.5

0.1

>61000

         

625.5

626

0.5

700 - 40000

         

627

627.5

0.5

<500

         

629

629.5

0.5

<500 - 1000

         

640

640.5

0.5

<500 - 600

         

640.5

641

0.5

<500 - 510

         

649

649.5

0.5

<500

         

658

658.5

0.5

<500 - 800

         

658.5

659

0.5

<500

         

665

665.5

0.5

<500

         

668

668.5

0.5

<500 - 800

         

668.5

669

0.5

<500 - 560

         

671

671.5

0.5

<500

         

687

687.5

0.5

<500

RK-24-223

345

-66

TBD

106.8

336

336.5

0.5

<500 - 800

         

633

633.5

0.5

<500 - 7200

         

633.5

634

0.5

<500 - 40000

         

634

634.5

0.5

<500 - 1300

         

634.5

635

0.5

<500 - 1700

         

635

635.5

0.5

<500

         

645.5

646

0.5

<500 - 740

         

646

646.5

0.5

2100 - 10000

         

646.5

647

0.5

7500 - 24000

         

647

647.5

0.5

1000 - 24000

         

675

675.5

0.5

500 - 4200

         

675.5

676

0.5

1200 - 7200

         

676

676.5

0.5

<500 - 3700

         

678

678.5

0.5

<500 - 700

         

678.5

679

0.5

<500

         

679.5

680

0.5

<500 - 800

         

689.5

690

0.5

<500 - 2500

         

690

690.5

0.5

5000 - 14000

         

690.5

691

0.5

4000 - 12000

         

691

691.5

0.5

<500 - 6000

         

691.5

692

0.5

3000 - 12000

         

692

692.5

0.5

5000 - 14000

         

692.5

693

0.5

<500 - 1100

         

695.5

696

0.5

<500 - 3100

         

696

696.5

0.5

<500 - 1500

         

696.5

697

0.5

<500

         

702.5

703.5

1

<500

         

704.5

705

0.5

<500

         

713.5

714

0.5

<500 - 1700

         

714.5

715

0.5

<500

         

715

715.5

0.5

<500 - 1200

         

716

716.5

0.5

1200 - 1800

         

716.5

717

0.5

<500 - 1100

         

717

717.5

0.5

1500 - 2200

         

717.5

718

0.5

<500 - 2000

         

718

718.5

0.5

<500 - 5100

         

720.5

721

0.5

<500 - 5900

         

721

721.5

0.5

<500 - 2000

         

722

722.5

0.5

1100 - 12000

         

722.5

723

0.5

1500 - 23000

         

723

723.5

0.5

3500 - 37000

         

726

726.5

0.5

<500 - 3000

         

726.5

727

0.5

3000 - 12000

         

727

727.5

0.5

<500

         

737.5

738

0.5

<500 - 5000

         

738

738.5

0.5

<500 - 1400

         

743

743.5

0.5

<500 - 700

         

749

750

1

<500

         

756.5

757

0.5

<500

         

757.5

758

0.5

<500

         

758.5

759

0.5

<500

         

759

759.5

0.5

<500 - 720

         

760

760.5

0.5

<500 - 3000

         

763.5

764

0.5

<500 - 650

         

764.5

765.5

1

<500

         

765.5

766

0.5

900 - 3700

         

766

766.5

0.5

800 - 15000

         

766.5

767

0.5

800 - 25000

         

767

767.5

0.5

1000 - 11000

         

767.5

768

0.5

<500

         

772

772.5

0.5

<500-500

         

772.5

773

0.5

<500

         

773.5

774

0.5

<500 - 700

         

774

774.5

0.5

<500 - 10000

         

775

775.5

0.5

<500

RK-24-224

310

-70

TBD

115.8

TBD

  • All depths and intervals are meters downhole, true thicknesses are yet to be determined.
  • "Off-scale" refers to >61,000 cps total readings by gamma spectrometer type RS-125.
  • 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.
  • 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.

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 standards in environmental and social governance. The Rook I Project is supported by a NI 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.

www.nexgenenergy.ca

Technical Disclosure*

All technical information in this news release has been reviewed and approved by Jason Craven, NexGen's Manager, 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 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 6, 2024 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.sedar.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.

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