NexGen Announces Best Hole (RK-24-207) to Date and Material Expansion of Mineralized Zone at Patterson Corridor East

Company news release Source: Cision
8 August 2024, 6:30 a.m. EDT

VANCOUVER, BC, Aug. 8, 2024 /CNW/ - NexGen Energy Ltd. ("NexGen" or the "Company") (TSX: NXE) (NYSE: NXE) (ASX: NXG) is pleased to announce the mineralized zone at Patterson Corridor East (PCE) has materially expanded since the original discovery in the 2024 Winter Program (see NexGen News Release dated March 11, 2024). The Summer Drill Program commenced May 21st, with eight (8) out of twelve (12) drillholes intersecting mineralization to date (Figures 1 and 2, Table 1). Extensive mineralization plunges to the east with a span of 540 m along strike and 600 m vertical extent, showing wide intervals of elevated radioactivity that remain open at depth and along strike. In comparison, previously reported holes from PCE had identified two mineralized holes, 275 m apart.

Off-scale (>61,000 cps) high-grade uranium mineralization has been intersected in four drillholes to date, including RK-24-183, -197, -202, and -207. The most recent intersection in RK-24-207 contains the first instance of massive replacement by uraninite, a key indicator of a strongly mineralized system (Figures 3 and 4, Table 1) with 1.5 m >10,000 cps (including 0.3 m >61,000 cps) within cumulative interval mineralization of 26.2 m > 500 cps (Table 2).

Results include the best and most recent intercept in RK-24-207, that confirms continuity of mineralization, massive replacement uranium and significant high grade at PCE (Table 1). The high-intensity style mineralization is indicative of exceptional formation conditions linked to significant orebodies within the Athabasca Basin and most notably the Arrow Deposit 3.5 km to the west. In addition, this zone of high-intensity mineralization in RK-24-207 is at a similar depth to Arrow's A2 high-grade heart. PCE, like Arrow, is contained solely in the competent basement rock which is the ideal underground setting. The mineralized signature is expressed as very analogous to Arrow, localized veins (up to off-scale >61,000 cps) within elevated radioactivity that extends over more than 100 m.

Summer drilling to date totals 10,045.5 m of the planned 22,000 m from 12 completed drillholes. Assays from disclosed mineralized intersections are pending and due in Q4 2024.

As a consequence of these results, the focus of the summer program has substantially elevated with two primary objectives:

  • continue to test the extent of the mineralized system through bold step outs, and
  • vector in on the high-grade zones within the broader mineralized system.

Leigh Curyer, Chief Executive Officer, commented: "In the first two months of the summer program, the results have rapidly indicated an expansive, mineralized footprint with remarkable continuity. Geological characteristics are very analogous to Arrow indicating a large, pervasive and high-grade system. The summer program has been purposely bold with very large drill step outs and has intersected mineralization in an additional 8 of the 12 holes drilled. Important to note, PCE has currently hit 4 holes with intense mineralization >61,000 cps, with this occurring at Arrow for the first time in the 15th hole - which led to subsequently delineating broad ultra-high grade zones in the A2 shear of Arrow.

Discoveries of the calibre of Arrow all take their own path in terms of time and extent of drilling to fully define. PCE is now commencing its path showing all the characteristics of Arrow at the same stage. PCE validates the continued prospectivity of the NexGen land package is immense and underpins the southwest Athabasca Basin as the future of Canada's uranium industry growth over the balance of this century.

NexGen is at an incredibly exciting stage, focused on concluding the Federal Environmental Assessment for the Rook I Project, construction readiness on receipt of final approvals and in parallel drilling a newly discovered zone of mineralization."

Mineralization is hosted as semi-massive to massive pitchblende veins, fracture coatings, and disseminations. Structures focus the mineralization via reactivated shears and faults while competent wall rock (silicified orthogneiss) acts as a physical trap. The mineralization and alteration patterns depict a well-developed hydrothermal fluid system. Typical alteration associated with the mineralization includes the formation of iron-rich minerals (hydrothermal hematite), iron oxide (limonite), clay, and chlorite. These characteristics combined with the size of the mineralized footprint, as well as the presence of >61,000 cps, demonstrates the similarities between PCE and Arrow at the same stage.

Figure 1: Schematic plan view of mineralized footprint at Arrow and PCE at the same stage of drilling; gravity as background with low values in blue (CNW Group/NexGen Energy Ltd.)

Figure 2: Schematic long section of mineralized footprint at Arrow and PCE at the same stage of drilling (CNW Group/NexGen Energy Ltd.)

Figure 3: Core photo from RK-24-207; high grade mineralization is hosted across 7.1 m from 523.9 to 531 m with outer low grade disseminated uranium extending above to 519.4 and below to 534.4 m; Narrow secondary veins are hosted nearby in the footwall below (CNW Group/NexGen Energy Ltd.)

Figure 4: RK-24-207 close-up of off-scale (>61,000 cps) massive replacement by uraninite at 525.1 m (CNW Group/NexGen Energy Ltd.)

Figure 5: RK-24-202 uraninite as blebs along foliation and fracture coating at 934.4 m, max peak of >61,000 cps (CNW Group/NexGen Energy Ltd.)

Figure 6: RK-24-202 mineral replacement by uraninite within shear zone at 967.5 m, max peak of 49,000 cps (CNW Group/NexGen Energy Ltd.)

Table 1: 2024 Summer program spectrometer results to date

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-24-195

310

-70

588.0

N/A

171.5

172.0

0.5

<500 - 1,500











172.0

172.5

0.5

<500











192.0

192.5

0.5

<500











216.0

216.5

0.5

<500

RK-24-196

310

-70

841.0

103.4

701.5

703.0

1.5

<500











703.0

703.5

0.5

1,600 - 2,500











703.5

704.0

0.5

<500











704.0

704.5

0.5

570 - 1,320











705.5

706.0

0.5

<500 - 520











723.5

724.0

0.5

<500 - 600











731.0

731.7

0.7

<500











731.7

731.8

0.1

3,380 - 4,180











731.8

731.9

0.1

10,000 - 14,000











731.9

732.0

0.1

<500











732.0

732.1

0.1

<500 - 3,100











732.5

736.5

4.0

<500 - 3,100











741.0

741.5

0.5

<500 - 4,000











742.5

743.0

0.5

<500 - 1,000











744.5

745.0

0.5

<500











745.0

745.5

0.5

<500 - 1,350











745.5

746.0

0.5

<500











746.0

746.5

0.5

<500 - 520











746.5

747.0

0.5

<500 - 530











747.0

748.0

1.0

<500











748.5

749.0

0.5

<500











749.5

750.0

0.5

<500 - 3,200











750.0

750.5

0.5

<500 - 2,100











757.0

757.5

0.5

<500 - 2,350











758.0

758.5

0.5

<500











760.0

760.5

0.5

<500











765.5

766.6

1.1

<500

RK-24-197

310

-70

792.0

117.7

241.0

241.5

0.5

<500











518.0

521.5

3.5

<500











523.5

524.0

0.5

<500











524.0

524.5

0.5

<500 - 990











524.5

525.0

0.5

<500 - 2990











525.0

525.5

0.5

<500 - 2510











525.5

526.0

0.5

<500 - 660











526.0

526.4

0.4

<500 - 10,000











526.4

526.6

0.2

10,000 - 13,050











526.6

527.0

0.4

510 - 6,550











527.0

527.5

0.5

1,040 - 9,560











527.5

527.6

0.1

9,580 - 10,000











527.6

527.8

0.2

10,000 - 26,400











527.8

528.5

0.7

<500











528.5

528.8

0.3

940 - 10,000











528.8

528.9

0.1

10,000 - 46,400











528.9

529.0

0.1

865 - 2,250











529.0

529.5

0.5

<500











530.5

535.5

5.0

<500











536.0

536.5

0.5

<500











546.0

546.5

0.5

<500











546.5

547.0

0.5

<500











547.0

547.5

0.5

<500 - 670











547.5

548.0

0.5

<500











548.0

548.5

0.5

<500 - 890











548.5

548.6

0.1

1,000 - 8,200











548.6

548.8

0.2

21,200 - 33,800











548.8

549.0

0.2

42,600 - 52,800











549.0

549.5

0.5

600 - 1,500











549.5

550.0

0.5

2,200 - 4,400











550.0

550.5

0.5

<500 - 1,600











550.5

551.0

0.5

<500











551.0

551.5

0.5

<500 - 620











551.5

552.0

0.5

<500 - 550











552.0

552.5

0.5

1,300 - 2,000











552.5

552.6

0.1

25,000 - 32,000











552.7

552.9

0.2

40,100 - >61,000











552.9

553.0

0.1

17,100 - 25,000











553.0

553.5

0.5

<500 - 1,500

RK-24-198

310

-70

743.2

117.3

333.5

334.0

0.5

<500











669.5

670.0

0.5

<500

RK-24-199

310

-70

807.0

107.1

No Significant Intersections

RK-24-200

310

-70

804.0

112.6

339.0

339.5

0.5

<500











354.0

354.5

0.5

<500 - 750











465.5

466.0

0.5

<500 - 600











611.0

611.5

0.5

<500 - 660











612.0

612.5

0.5

<500











613.0

613.5

0.5

<500 - 970











619.0

619.5

0.5

<500 - 510











619.5

620.0

0.5

<500











623.0

623.5

0.5

<500

RK-24-201

310

-70

939.0

108.9

412.5

413.0

0.5

<500











673.5

674.0

0.5

<500











674.5

675.0

0.5

<500











675.0

675.5

0.5

<500 - 3,800











675.5

676.0

0.5

<500











677.5

678.0

0.5

<500 - 550











678.5

679.0

0.5

650 - 700











679.0

679.5

0.5

<500











680.0

681.0

1.0

<500











693.5

694.0

0.5

700 - 800











694.0

695.0

1.0

<500











695.0

695.5

0.5

700 - 900











695.5

696.0

0.5

<500











696.0

696.5

0.5

500 - 1,800











696.5

697.0

0.5

500 - 2,600











697.0

699.0

2.0

<500











699.5

700.5

1.0

<500











700.5

701.0

0.5

650 - 700











701.0

701.5

0.5

<500 - 550











701.5

702.0

0.5

<500 - 600











702.0

702.5

0.5

<500 - 750











703.0

703.5

0.5

<500











708.0

709.0

1.0

<500











721.5

722.0

0.5

<500











741.0

741.5

0.5

<500











765.5

766.0

0.5

<500 - 1300











819.0

819.5

0.5

<500 - 1800











822.5

823.0

0.5

<500 - 630











837.5

838.0

0.5

<500











867.5

868.0

0.5

<500

RK-24-202

310

-70

1138.2

106.3

622.5

623.0

0.5

<500











623.5

624.0

0.5

<500











732.0

732.5

0.5

<500











780.5

781.0

0.5

<500











846.0

850.3

4.3

<500











886.0

886.2

0.2

<500 - 1,780











886.2

886.3

0.1

10,000 - 14,100











886.3

886.5

0.2

<500 - 1,700











887.5

888.0

0.5

<500 - 1,300











895.5

896.0

0.5

<500 - 3,200











907.0

908.0

1.0

<500











922.5

923.0

0.5

<500 - 650











926.5

927.0

0.5

<500











928.0

928.5

0.5

<500 - 540











931.0

931.5

0.5

<500 - 3,400











931.5

932.0

0.5

<500 - 1,050











932.0

932.5

0.5

<500 - 650











933.5

934.0

0.5

<500 - 2,580











934.0

934.3

0.3

<500 - 6,100











934.3

934.4

0.1

55,500 - >61,000











934.4

934.5

0.1

<500











936.0

936.3

0.3

<500











936.3

936.4

0.1

12,000 - >61,000











936.4

936.5

0.1

530 - 650











943.5

944.0

0.5

<500 - 2,290











944.0

944.5

0.5

<500 - 800











947.0

947.5

0.5

<500











948.5

949.0

0.5

<500











951.0

951.5

0.5

<500











951.5

951.7

0.2

850 - 3,200











951.7

952.0

0.3

10,000 - 17,200











952.0

952.5

0.5

<500 - 7,500











952.5

953.0

0.5

<500 - 690











953.0

953.5

0.5

<500











953.5

954.0

0.5

<500 - 1,700











954.0

954.5

0.5

600 - 2,020











954.5

955.0

0.5

500 - 8,500











955.0

955.5

0.5

<500











955.5

956.0

0.5

500 - 2,250











956.0

956.5

0.5

<500 - 3,200











957.0

957.5

0.5

<500 - 1,500











957.5

958.0

0.5

500 - 1,000











958.0

958.5

0.5

<500 - 1,010











958.5

959.0

0.5

<500 - 1,650











959.0

959.5

0.5

<500 - 2,000











959.5

960.0

0.5

<500 - 2,300











961.0

961.5

0.5

<500 - 2,000











961.5

962.0

0.5

<500 - 2,270











963.0

964.0

1.0

<500











964.0

964.5

0.5

<500 - 750











965.0

965.5

0.5

<500 - 1,500











965.5

966.0

0.5

3,000 - 8,000











966.0

966.5

0.5

<500 - 3,000











966.5

967.0

0.5

5,000 - 6,000











967.0

967.3

0.3

5,000 - 6,000











967.3

967.5

0.2

10,000 - 49,000











967.5

968.0

0.5

1,700 - 8,100











968.0

968.5

0.5

<500 - 2,000











968.5

969.0

0.5

<500 - 1,600











969.0

969.5

0.5

<500 - 940











980.0

980.5

0.5

<500 - 4,000











981.0

981.5

0.5

<500 - 650











981.5

982.0

0.5

<500











983.0

983.5

0.5

<500 - 820











983.5

984.0

0.5

<500 - 900











984.0

984.5

0.5

1450 - 1,820











984.5

985.0

0.5

800 - 3,700











985.0

985.5

0.5

<500 - 700











985.5

986.0

0.5

<500











996.5

997.0

0.5

<500











997.5

998.0

0.5

<500











998.0

998.5

0.5

<500 - 2,280











1005.0

1006.5

1.5

<500











1008.5

1009.5

1.0

<500











1016.5

1017.0

0.5

<500 - 660











1026.5

1027.0

0.5

<500

RK-24-203

310

-70

738.0

103.7

360.5

361.0

0.5

<500











363.5

364.0

0.5

<500











470.0

471.5

1.5

<500











472.0

472.5

0.5

<500

RK-24-204

290

-70

822.0

110.1

471.5

472.0

0.5

<500











553.0

553.5

0.5

<500











554.0

555.0

1.0

<500











555.0

555.5

0.5

<500 - 570











555.5

556.0

0.5

<500 - 900











556.0

556.5

0.5

680 - 1,900











556.5

557.0

0.5

<500 - 1,300











557.0

557.5

0.5

<500 - 530











557.5

558.0

0.5

<500 - 1,150











558.0

558.5

0.5

580 - 900











558.5

559.0

0.5

<500 - 600











559.0

560.0

1.0

<500











574.0

574.5

0.5

<500 - 2,020











574.5

575.0

0.5

<500 - 1,860











575.0

575.5

0.5

<500 - 4,120











575.5

576.0

0.5

<500 - 600











576.0

576.5

0.5

<500 - 1,400











576.5

577.5

1.0

<500











578.0

578.5

0.5

<500 - 580











579.0

579.5

0.5

<500 - 580











579.5

580.0

0.5

<500











580.0

580.5

0.5

<500 - 660











580.5

580.8

0.3

2,100 - 2,800











580.8

581.0

0.2

10,000 - 11,000











581.0

581.5

0.5

3,600 - 8,000











581.5

582.0

0.5

550 - 8,700











582.0

582.5

0.5

<500 - 4,700











582.5

583.0

0.5

800 - 2,200











583.0

583.5

0.5

<500 - 1,500











583.5

584.0

0.5

<500 - 2,400











584.0

584.5

0.5

<500











585.5

586.0

0.5

<500 - 680











587.0

587.5

0.5

<500 - 5,370











587.5

588.0

0.5

900 - 7,200











588.0

588.5

0.5

<500 - 1,200











588.5

590.0

1.5

<500











595.5

596.5

1.0

<500











597.0

597.5

0.5

<500 - 510











598.5

599.0

0.5

<500 - 1,100











599.0

599.5

0.5

<500 - 3,850











599.5

600.0

0.5

<500 - 700











600.0

600.5

0.5

<500 - 3,700











600.5

601.0

0.5

<500

RK-24-205

320

-70

1032.0

109.1

459.5

464.0

4.5

<500











464.0

464.5

0.5

500 - 1,000











464.5

465.0

0.5

<500











741.5

742.0

0.5

<500 - 1,100











742.0

742.5

0.5

1,600 - 7,500











742.5

743.0

0.5

<500 - 1,500











746.5

747.0

0.5

<500 - 600











747.0

748.0

1.0

<500











766.0

766.5

0.5

<500











768.0

768.5

0.5

<500 - 950











769.0

769.5

0.5

<500 - 1,600











769.5

770.0

0.5

500 - 1,300











770.0

770.5

0.5

<500 - 1,300











770.5

771.0

0.5

700 - 1,200











771.0

771.5

0.5

<500 - 850











771.5

772.0

0.5

<500 - 700











772.5

773.5

1.0

<500











779.5

780.0

0.5

<500 - 600











780.0

780.5

0.5

<500











784.0

784.5

0.5

<500 - 1,150











784.5

785.0

0.5

<500











785.0

785.5

0.5

<500 - 700











786.0

786.5

0.5

600 - 1,400











786.5

787.0

0.5

<500 - 1,050











787.0

787.5

0.5

500 - 950











787.5

788.0

0.5

<500











788.0

788.5

0.5

<500 - 1,900











788.5

789.0

0.5

<500 - 750











789.0

789.5

0.5

800 - 4,200











789.5

790.0

0.5

900 - 4,800











790.0

790.5

0.5

<500 - 850











791.0

791.5

0.5

<500 - 2,200











791.5

792.0

0.5

<500 - 1,500











792.0

792.5

0.5

<500 - 800











792.5

793.0

0.5

<500











793.0

793.5

0.5

<500 - 1,200











793.5

793.6

0.1

<500 - 25,000











793.6

794.0

0.4

<500 - 3,000











794.0

794.5

0.5

<500











794.5

795.0

0.5

<500 - 600











795.0

795.5

0.5

<500











802.0

802.5

0.5

<500











804.0

804.5

0.5

<500











804.5

805.5

1.0

<500 - 650











807.0

807.5

0.5

<500 - 900











807.5

808.0

0.5

<500 - 550











808.0

808.5

0.5

<500











851.0

851.5

0.5

<500











853.5

854.0

0.5

<500 - 2,300

RK-24-206

298

-75

TBD

96.5

In progress

RK-24-207

330

-70

801.0

114.9

505.0

510.5

5.5

<500











514.5

515.5

1.0

<500











515.5

516.0

0.5

<500 - 980











516.0

516.5

0.5

<500 - 650











516.5

517.0

0.5

<500 - 410











517.0

517.5

0.5

<500 - 800











517.5

518.0

0.5

<500 - 950











518.0

518.5

0.5

<500











519.0

519.5

0.5

<500











519.5

520.0

0.5

550 - 8,500











520.0

520.5

0.5

1,000 - 1,750











520.5

521.0

0.5

750 - 1,500











521.0

521.5

0.5

<500 - 1,500











521.5

522.0

0.5

<500 - 800











522.0

522.5

0.5

700 - 8,500











522.5

523.0

0.5

900 - 1,400











523.0

523.5

0.5

800 - 1,700











523.5

524.0

0.5

600 - 8,200











524.0

524.5

0.5

10,000 - 32,000











524.5

525.0

0.5

5,000 - 22,000











525.0

525.1

0.1

30,000 - 60,000











525.1

525.4

0.3

>61,000











525.4

525.5

0.1

22,000 - 60,000











525.5

526.0

0.5

600 - 6,200











526.0

526.5

0.5

<500 - 3,500











526.5

527.0

0.5

1,700 - 9,800











527.0

527.5

0.5

2,800 - 20,000











527.5

528.0

0.5

500 - 24,000











528.0

528.5

0.5

750 - 1,200











528.5

529.0

0.5

2,800 - 9,500











529.0

529.5

0.5

1,100 - 6,500











529.5

530.0

0.5

1,100 - 2,900











530.0

530.5

0.5

550 - 1,600











530.5

531.0

0.5

1,500 - 4,300











531.0

531.5

0.5

550 - 900











531.5

532.0

0.5

<500 - 750











532.0

532.5

0.5

<500 - 1,200











533.0

533.5

0.5

<500 - 1,250











533.5

534.0

0.5

950 - 1,800











534.0

534.5

0.5

600 - 1,500











534.5

535.0

0.5

<500











536.0

536.5

0.5

<500











536.5

537.0

0.5

<500 - 15,000











537.0

537.5

0.5

<500 - 4,200











538.0

538.5

0.5

<500











538.5

539.0

0.5

<500 - 560











539.0

539.5

0.5

<500











540.0

540.5

0.5

<500 - 7,200











540.5

541.0

0.5

4,600 - 8,200











550.5

551.0

0.5

<500











552.0

552.5

0.5

<500 - 570











554.0

554.5

0.5

<500











558.5

559.0

0.5

<500











560.0

561.0

1.0

<500











567.5

568.0

0.5

<500











572.5

573.0

0.5

<500











578.5

579.0

0.5

<500











581.5

582.0

0.5

<500 - 1,010











583.5

584.5

1.0

<500











585.5

586.0

0.5

<500 - 780











586.0

587.0

1.0

<500











595.0

595.5

0.5

<500











595.5

596.0

0.5

<500 - 900











596.0

597.0

1.0

<500











600.5

601.0

0.5

<500











610.5

611.0

0.5

<500











619.0

620.0

1.0

<500 - 510











625.8

627.0

1.2

<500 - 550











636.8

641.0

4.2

<500











644.0

645.5

1.5

<500











717.5

718.5

1.0

<500 - 880











729.0

732.0

3.0

<500 - 980

  • 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.

Table 2: Cumulative mineralization from 2024 summer program to date

Hole ID

Cumulative

Radioactivity

>500 cps

(m)

Maximum

Reading

(cps)

RK-24-195

0.5

1,500

RK-24-196

10.3

14,000

RK-24-197

10.2

>61000

RK-24-198

0

N/A

RK-24-199

0

N/A

RK-24-200

1.5

970

RK-24-201

7

3,800

RK-24-202

23.6

>61000

RK-24-203

0

N/A

RK-24-204

16

11,000

RK-24-205

17

25,000

RK-24-207

26.2

>61000

  • All depths and intervals are meters downhole, true thicknesses are yet to be determined.
  • Radioactivity measured by gamma scintillometer type RS-120 and gamma spectrometer type RS-125.
  • Maximum readings stated as 'N/A' had no radioactivity >500 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 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.

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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SOURCE NexGen Energy Ltd.