NexGen Significantly Extends Mineralization in the A2 and A3 Shears to the Northeast

VANCOUVER, Feb. 23, 2017 /CNW/ - NexGen Energy Ltd. ("NexGen" or the "Company") (TSX:NXE, OTCQX:NXGEF) is pleased to report the first results from the 35,000 m winter 2017 drilling program at our 100% owned, Rook I property, Athabasca Basin, Saskatchewan.

Several drill holes have intersected significant mineralization in previously untested areas located outside the maiden A2 and A3 resource grade shells of the Arrow Deposit to the northeast, including some of the most intense mineralization encountered in the A3 shear to date. 

Highlights:

A2 Shear Northeast Extension

  • Drill hole AR-17-119c1 has extended mineralization 120 m to the northeast of the maiden A2 resource grade shell intersecting 21.5 m of total composite mineralization including 1.15 m of total off-scale radioactivity (>10,000 to 53,000 cps) within a 95.0 m section (485.0 to 580.0 m).
  • Scissor hole AR-17-116c2 drilled 35 m northeast from the edge of the maiden A2 grade shell intersected 47.0 m of total composite mineralization including 3.05 m of total off-scale radioactivity (>10,000 to >61,000 cps) within a 111.0 m section (642.0 to 753.0 m).

A3 Shear Northeast Extension

  • Scissor hole AR-17-116c1 was drilled up-dip and northeast in a previously untested area approximately 45 m to the northeast boundary of the maiden A3 resource grade shell intersecting 64.0 m of total composite mineralization including 6.5 m of total off-scale radioactivity (>10,000 to >61,000 cps) within an 84.5 m section (425.5 to 510.0 m).
  • Scissor hole AR-17-114c2 intersected 54.0 m of total composite mineralization including 6.55 m of total off-scale radioactivity (>10,000 to >61,000 cps) within a 139.0 m section (437.5 to 576.5 m).
  • Scissor hole AR-17-118c1 intersected 55.0 m of total composite mineralization including 6.55 m of total composite off-scale radioactivity (>10,000 to >61,000 cps) within a 104.0 m section (571.5 to 675.5 m).

A2 High Grade Domain

  • Scissor hole AR-17-117c1 (25 m southwest and up-dip from AR-15-44b) intersected 72.0 m of total composite mineralization including 11.05 m of total composite off-scale radioactivity (>10,000 to >61,000 cps) within a 151.5 m section (461.0 to 612.5 m).
  • Scissor hole AR-17-114c2 (115 m northeast and down-dip from AR-15-44b) intersected 41.0 m of total composite mineralization including 7.35 m of total composite off-scale radioactivity (>10,000 to >61,000 cps) within a 109.0 m section (626.0 to 735.0 m).
  • Scissor hole AR-17-114c1 (87 m northeast and down-dip from AR-15-44b) intersected 77.0 m of total composite mineralization including 5.7 m of total composite off-scale radioactivity (>10,000 to >61,000 cps) within a 105.5 m section (607.5 to 713.0 m).

Arrow, Activities & Financial

  • The 2017 winter program comprising a minimum of 35,000 m of drilling with seven drill rigs is underway.
  • An updated NI 43-101 resource estimate on the Arrow Deposit is scheduled for the first half of 2017.
  • The Company has cash on hand of approximately $70 million.

The A2 and A3 long sections as well as a map showing drill hole locations are shown in Figures 1 to 3. Table 1 is a summary of the mineralized intervals.

Garrett Ainsworth, Vice-President, Exploration and Development, commented: "The objectives of the 2017 winter drill program are weighted towards expanding the area of mineralization at Arrow and subsequent infilling of the deposit. The first batch of results from the 2017 program have materially expanded the A2 and A3 shears to the northeast demonstrating continuity of these broad mineralized shears and include high grade sub-intervals. High grade sub-intervals in the A2 led us to discover the high grade A2 sub-zone. The northeast extension of the A2, the up-dip northeast extension of the A3 shear, and the southwest gap between Arrow and the 180 m southwest area are all high priorities given their growth profiles."   

Leigh Curyer, Chief Executive Officer, commented: "These initial 2017 results suggest the ultimate extent of Arrow is still in the early stages of definition. It's quite remarkable considering the maiden Inferred mineral resource estimate published in March 2016 ranks Arrow as the largest undeveloped uranium deposit in Canada. The updated resource estimate incorporating 2016 drilling at Arrow is on schedule for release in the coming months. The 2017 program will continue to aggressively test the boundaries of the known area of mineralization which, to date, have continually extended the boundaries of Arrow."

                                                                   Table 1: Arrow Deposit Drill Hole Data




Drill Hole

Athabasca

Group -

Basement

Unconformity

Depth (m)

Handheld Scintillometer Results (RS-120)

Hole ID

Azimuth

Dip

Total

Depth

(m)

From (m)

To (m)

Width (m)

CPS Range

AR-17-114c1

327

-70

849.50

130.00

436.00

452.00

16.00

<500 -  11500






454.50

456.00

1.50

<500 -  7000






472.00

474.50

2.50

<500 -  12000






482.00

489.00

7.00

<500 -  3500






493.00

494.00

1.00

<500 -  960






502.50

509.50

7.00

<500 -  52000






514.00

517.50

3.50

<500 -  >61000






532.50

533.00

0.50

<500 -  510






607.50

608.50

1.00

<500 -  1900






612.00

617.00

5.00

<500 -  3300






623.50

640.00

16.50

<500 -  >61000






645.50

678.00

32.50

<500 -  54000






683.00

689.50

6.50

<500 -  5100






692.00

695.50

3.50

<500 -  3700






698.50

699.00

0.50

<500 -  14000






701.50

713.00

11.50

<500 -  9900






735.00

738.00

3.00

<500 -  530

AR-17-114c2

327

-70

823.50

130.00

437.50

438.00

0.50

<500 -  870






441.00

443.00

2.00

<500 -  530






453.00

456.50

3.50

<500 -  12000






465.00

465.50

0.50

<500 -  13700






471.50

472.00

0.50

<500 -  24000






480.50

481.00

0.50

<500 -  1800






485.50

486.50

1.00

<500 -  18000






494.00

507.00

13.00

<500 -  33000






510.00

517.50

7.50

<500 -  5500






524.00

524.50

0.50

<500 -  2600






529.00

531.00

2.00

<500 -  >61000






534.50

535.50

1.00

<500 -  11000






539.50

557.50

18.00

<500 -  >61000






561.00

563.00

2.00

<500 -  760






569.50

570.50

1.00

<500 -  1100






576.00

576.50

0.50

<500 -  570






626.00

628.50

2.50

<500 -  1200






639.00

639.50

0.50

<500 -  560






644.50

646.50

2.00

<500 -  4000






679.00

680.00

1.00

<500 -  2800






684.00

717.50

33.50

<500 -  >61000






733.50

735.00

1.50

<500 -  7600

AR-17-115c1

327

-70

714.50

118.40

451.50

452.00

0.50

<500 -  1200






459.00

460.00

1.00

<500 -  2200






479.00

486.50

7.50

<500 -  6500






524.50

525.00

0.50

<500 -  2600






533.50

534.00

0.50

<500 -  1200






536.50

537.50

1.00

<500 -  5700






560.00

560.50

0.50

<500 -  510






603.00

613.00

10.00

<500 -  40000






615.50

619.00

3.50

<500 -  2700






660.00

663.50

3.50

<500 -  2700






674.50

675.00

0.50

<500 -  800

AR-17-115c2

327

-70

786.50

118.40

458.50

459.00

0.50

<500 -  1750






465.00

465.50

0.50

<500 -  1820






468.50

469.00

0.50

<500 -  1400






495.00

496.00

1.00

<500 -  11000






501.00

501.50

0.50

<500 -  13000






517.00

520.00

3.00

<500 -  3500






534.00

534.50

0.50

<500 -  760






541.50

542.00

0.50

500 -  13000






550.50

551.00

0.50

<500 -  18000






572.50

573.00

0.50

<500 -  700






580.50

582.50

2.00

<500 -  1670






601.50

602.50

1.00

<500 -  800






608.00

609.50

1.50

<500 -  5200






613.50

621.50

8.00

<500 -  56000






624.00

628.00

4.00

<500 -  22500






632.50

633.00

0.50

<500 -  710






635.50

640.00

4.50

<500 -  8200






644.00

644.50

0.50

<500 -  4300






649.50

655.50

6.00

<500 -  12500






672.50

673.00

0.50

<500 -  740






675.50

676.50

1.00

<500 -  5200






698.50

700.50

2.00

<500 -  2200

AR-17-116c1

327

-70

879.50

132.00

425.50

429.00

3.50

<500 -  17000






431.50

442.00

10.50

<500 -  15000






449.00

461.00

12.00

<500 -  19000






465.50

466.00

0.50

700 -  17000






469.00

494.00

25.00

<500 -  >61000






497.50

510.00

12.50

<500 -  24000






605.00

607.50

2.50

<500 -  50000






625.00

625.50

0.50

<500 -  1100






636.00

637.50

1.50

<500 -  750






659.00

661.00

2.00

<500 -  1100






705.50

707.00

1.50

<500 -  700






796.50

799.00

2.50

<500 -  950






802.00

805.50

3.50

<500 -  1450

AR-17-116c2

327

-70

897.50

132.00

440.00

440.50

0.50

<500 -  2200






444.00

445.50

1.50

<500 -  5300






457.00

459.00

2.00

<500 -  6900






485.00

485.50

0.50

<500 -  510






489.00

493.00

4.00

<500 -  35000






497.50

499.00

1.50

1200 -  53000






518.00

519.00

1.00

<500 -  49000






522.00

526.00

4.00

<500 -  6600






532.00

532.50

0.50

<500 -  530






537.50

540.00

2.50

<500 -  5800






547.50

549.00

1.50

<500 -  1280






566.50

568.50

2.00

<500 -  1700






571.50

572.00

0.50

<500 -  1150






578.50

580.00

1.50

<500 -  570






642.00

645.50

3.50

<500 -  760






663.50

670.00

6.50

<500 -  6900






673.50

675.00

1.50

<500 -  2300






678.50

682.50

4.00

<500 -  1700






685.00

685.50

0.50

<500 -  860






693.50

710.50

17.00

<500 -  >61000






720.50

732.00

11.50

<500 -  41000






734.50

735.50

1.00

<500 -  3700






747.00

747.50

0.50

<500 -  870






752.00

753.00

1.00

<500 -  2100






860.50

861.00

0.50

<500 -  740

AR-17-117c1

327

-70

621.50

124.20

395.00

395.50

0.50

<500 -  530






400.00

400.50

0.50

<500 -  1500






407.50

409.00

1.50

<500 -  670






418.00

418.50

0.50

<500 -  900






427.00

427.50

0.50

<500 -  2100






430.00

431.00

1.00

<500 -  600






434.00

443.00

9.00

<500 -  1410






446.50

447.50

1.00

<500 -  880






451.00

454.00

3.00

<500 -  3000






461.00

462.00

1.00

<500 -  1150






467.50

478.00

10.50

<500 -  3400






480.50

484.00

3.50

<500 -  2600






490.00

496.00

6.00

<500 -  2100






498.50

499.00

0.50

<500 -  680






501.50

504.00

2.50

<500 -  700






519.50

526.00

6.50

<500 -  2000






529.00

529.50

0.50

<500 -  550






533.50

561.50

28.00

<500 -  >61000






564.00

568.50

4.50

<500 -  28000






589.00

590.50

1.50

<500 -  1200






605.50

612.50

7.00

<500 -  8100

AR-17-118c1

327

-70

873.00

129.90

463.50

464.00

0.50

<500 -  1100






468.00

474.00

6.00

<500 -  1690






537.00

543.50

6.50

<500 -  27000






571.50

577.00

5.50

<500 -  19000






585.50

586.00

0.50

<500 -  960






600.00

600.50

0.50

<500 -  530






603.50

604.00

0.50

<500 -  570






607.00

612.50

5.50

<500 -  >61000






616.50

617.00

0.50

800 -  26000






619.50

622.50

3.00

<500 -  52000






628.00

650.50

22.50

<500 -  >61000






654.50

670.50

16.00

<500 -  9100






675.00

675.50

0.50

<500 -  510






695.00

697.00

2.00

<500 -  900






700.00

713.50

13.50

<500 -  4000






716.00

716.50

0.50

<500 -  650






745.00

745.50

0.50

<500 -  620






758.50

759.00

0.50

<500 -  1000






838.50

840.00

1.50

<500 -  17000

AR-17-119c1

147

-67

825.50

119.50

354.00

357.00

3.00

<500 -  1700


.




419.50

436.00

16.50

<500 -  9000






456.00

456.50

0.50

<500 -  850






462.50

471.50

9.00

<500 -  4300






487.50

489.00

1.50

<500 -  3200






504.00

506.00

2.00

<500 -  >61000






509.50

510.00

0.50

<500 -  7800






514.00

514.50

0.50

600 -  2900






529.00

529.50

0.50

<500 -  540






536.00

536.50

0.50

<500 -  900






543.50

556.50

13.00

<500 -  48000






559.00

560.50

1.50

<500 -  1250






580.50

581.00

0.50

660 -  1600






591.00

591.50

0.50

<500 -  510






596.00

596.50

0.50

<500 -  540






605.50

608.50

3.00

<500 -  2100






613.00

613.50

0.50

<500 -  620






617.00

621.00

4.00

<500 -  1050






679.00

687.50

8.50

<500 -  35000

 

Parameters:

  • Maximum internal dilution 2.00 m downhole
  • All depths and intervals are meters 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 estimated.
  • "Anomalous" means >500 cps (counts per second) total count gamma readings by gamma scintillometer type RS-120
  • "Off-scale" means >10,000 cps (counts per second) total count gamma readings by gamma scintillometer type RS-120
  • Where "Min cps" is <500 cps, this refers to local low radiometric zones within the overall radioactive interval

Arrow Deposit Drilling

AR-17-114c1

Hole AR-17-114c1 was a directional hole collared from the surface at an angled orientation (-70°) to the northwest (327° Azimuth). It was a scissor hole designed to test the A2 shear 15 m down-dip of AR-16-96c2 (4.17% U3O8 over 57.5 m in the A2 shear) and the A3 shear 25 m up-dip of AR-14-13 (1.08% U3O8 over 18.25 m, 1.31% U3O8 over 11.85 m and 5.35% U3O8 over 4.5 m in the A3 shear). Directional drilling was initiated at 201 m. The A2 and A3 shears were intersected at inclinations of -67° and -68°, respectively.

The hole intersected moderately bleached Athabasca sandstone between 112.3 m and the unconformity at 130.0 m. Basement lithologies dominantly consisted of semi-pelitic gneiss with intervals of graphitic pelitic gneiss (the A1 through A3 shears) including mylonite.  The hole successfully intersected anomalous to strongly anomalous radioactivity in the A1 through A3 shears in association with stringers, disseminated, foliation-controlled, fracture-controlled, and semi-massive to massive pitchblende mineralization. A total composite mineralization of 119.0 m was intersected over 302 m (436.0 to 738.0 m) including 8.75 m of off-scale radioactivity (>10,000 to >61,000 cps). In the A1 shear, 3.0 m of composite mineralization was intersected. In the A2 shear, 77.0 m of composite mineralization was intersected including 5.7 m of off-scale radioactivity. In the A3 shear, 39.0 m of composite mineralization was intersected including 3.05 m of off-scale radioactivity. The hole was terminated at a depth of 849.5 m.

AR-17-114c2

Hole AR-17-114c2 is a directional hole that departed pilot hole AR-17-114c1 at a depth of 346 m. The hole was designed to test A2 shear 42 m down-dip of AR-16-96c2 (4.17% U3O8 over 57.5 m in the A2 shear) and the A3 shear 10 m up-dip of AR-14-13 (1.08% U3O8 over 18.25 m, 1.31% U3O8 over 11.85 m and 5.35% U3O8 over 4.5 m in the A3 shear). Directional drilling was initiated at 361 m. The A2 shear was intersected at an inclination of -68°.

Basement lithologies were intersected beginning at the top of the hole and consisted largely of semi-pelitic gneiss to granofel and relatively narrow intervals of pelitic gneiss and mylonite (the A2 and A3 shears). Anomalous to strongly anomalous radioactivity was intersected in the A2 and A3 shears in association with stringers, disseminated, fracture-controlled, and semi-massive pitchblende mineralization. A total composite mineralization of 95.0 m including 13.9 m of off-scale radioactivity (>10,000 to >61,000 cps) was intersected within a 297.5 m section (437.5 to 735.0 m). In the A2 shear, 41.0 m of composite mineralization including 7.35 m of off-scale radioactivity was intersected. In the A3 shear, 54.0 m of composite mineralization including 6.55 m of off-scale radioactivity was intersected. The hole was terminated at 823.5 m.

AR-17-115c1

Hole AR-17-115c1 was a directional hole collared from the surface at an angled orientation (-70°) to the northwest (327° Azimuth). It was a scissor hole designed to test the A2 shear 80 m down-dip of AR-16-81c3 (17.19% U3O8 over 23.0 m in the A2 shear). Directional drilling was initiated at 300 m. The A2 shear was intersected at an inclination of -69°.

The hole intersected bleached and hematized Athabasca Group sandstones between 113.0 m and the unconformity at 118.4 m. Basement lithologies primarily consist of semi-pelitic gneiss with minor intervals of graphitic pelitic gneiss (the A2 and A3 shears). The hole successfully intersected anomalous to strongly anomalous radioactivity in the A2 and A3 shears in association with stringers, disseminated, foliation-controlled, and fracture-controlled pitchblende mineralization. A total composite mineralization of 29.0 m including 0.3 m of off-scale radioactivity (>10,000 to 40,000 cps) was intersected within a 223.5 m section (451.5 to 675.0 m). In the A2 shear, 17.5 m of composite mineralization including 0.3 m of off-scale radioactivity was intersected. An additional 11.5 m of composite mineralization was intersected in the A3 shear. The hole was terminated at a depth of 714.5 m.

AR-17-115c2

Hole AR-17-115c2 is a directional hole that departed pilot hole AR-17-115c1 at a depth of 309 m. The hole was designed to test A2 high-grade domains 110 m down-dip and southwest of AR-16-81c3 (17.19% U3O8 over 23.0 m in the A2 shear). Directional drilling was initiated at 324 m. The A2 shear was intersected at an inclination of -71°.

Basement lithologies were intersected beginning at the top of the hole and consisted largely of semi-pelitic gneiss to granofel and relatively narrow intervals of pelitic gneiss and mylonite (the A2 and A3 shears). Anomalous to strongly anomalous radioactivity was intersected in the A2 and A3 shears in association with stringers, disseminated, and fracture-controlled pitchblende mineralization. A total composite mineralization of 39.5 m including 2.65 m of off-scale radioactivity (>10,000 to 51,000 cps) was intersected within a 242.0 m section (458.5 to 700.5 m). In the A2 shear, 32.0 m of composite mineralization including 2.15 m of off-scale radioactivity was intersected. An additional 7.5 m of composite mineralization including 0.5 m of off-scale radioactivity was intersected in the A3 shear. The hole was terminated at 786.5 m.

AR-17-116c1

Hole AR-17-116c1 was a directional hole collared from the surface at an angled orientation (-70°) to the northwest (327° Azimuth). It was designed as a scissor hole to test A2 shear 30 m down-dip and northeast of AR-16-108c4 (0.92% U3O8 over 49.5 m in the A2 shear), and the A3 shear 70 m up-dip and northeast of AR-16-101c2 (0.67% U3O8 over 27.5 m and 2.79% U3O8 over 11.5 m in the A3 shear). Directional drilling was initiated at 201 m. The A2 and A3 shears were intersected at inclinations of -65° and -66° respectively.

The hole intersected bleached and desilicified Athabasca Group sandstones between 123.0 m and the unconformity at 132.0 m. Basement lithologies largely consist of semi-pelitic gneiss with narrow intervals of graphitic pelitic gneiss and mylonite (the A1 through A3 shears). The hole successfully intersected anomalous to strongly anomalous radioactivity in the A2 through A3 shears in association with stringers, disseminated, foliation-controlled, fracture-controlled, and semi-massive pitchblende mineralization. A total composite mineralization of 78.0 m including 6.7 m of off-scale radioactivity (>10,000 to >61,000 cps) was intersected within a 380.0 m section (425.5 to 805.5 m). In the A2 shear, 6.5 m of composite mineralization was intersected including 0.2 m of off-scale radioactivity. In the A3 shear, 64.0 m of composite mineralization was intersected including 6.5 m of off-scale radioactivity. An additional 7.5 m of composite mineralization was intersected in the A1 shear. The hole was terminated at a depth of 879.5 m. 

AR-17-116c2

Hole AR-17-116c2 was a directional hole that departed pilot hole AR-17-116c1 at a depth of 204 m. The hole was designed to test the A2 shear 86 m down-dip of AR-16-108c3 (1.85% U3O8 over 27.0 m in the A2 shear) and the A3 shear 30 up-dip and northeast of AR-16-101c2 (2.79% U3O8 over 11.5 m and 0.67% U3O8 over 27.5 m in the A3 shear). Directional drilling was initiated at 585.5 m. The A2 and A3 shears were intersected at inclinations of -70° and -69° respectively.

Basement lithologies were intersected beginning at the top of the hole and consisted largely of semi-pelitic gneiss to granofel and relatively narrow intervals of pelitic gneiss and mylonite (the A1 through A4 shears). Anomalous to strongly anomalous radioactivity was intersected in the A1 through A4 shears in association with stringers, disseminated, fracture-controlled, and foliation-controlled pitchblende mineralization. A total composite mineralization of 71.0 m including 4.6 m of off-scale radioactivity (>10,000 to >61,000 cps) was intersected within a 421.0 m section (440.0 to 861.0 m). In the A1 shear, 0.5 m of composite mineralization was intersected. In the A2 shear, 47.0 m of composite mineralization including 3.05 m of off-scale radioactivity was intersected. In the A3 shear, 19.5 m of composite mineralization including 1.55 m of off-scale radioactivity was intersected. An additional 4.0 m of composite mineralization was intersected in the A4 shear. The hole was terminated at 897.5 m.     

AR-17-117c1

Hole AR-17-117c1 was a directional hole collared from the surface at an angled orientation (-70°) to the northwest (327° Azimuth). It was a scissor hole designed to test the A2 shear between holes AR-16-62 (6.35% U3O8 over 124.0 m in the A2 shear) and AR-16-63c2 (15.20% U3O8 over 42.0 m and 12.99% U3O8 over 46.5 m in the A2 shear). Directional drilling was initiated at 261 m. The A2 shear was intersected at an inclination of -70°.

The hole intersected bleached Athabasca Group sandstones between 121.0 m and the unconformity at 124.2 m. Basement lithologies dominantly consist of semi-pelitic gneiss with relatively narrow intervals of graphitic pelitic gneiss and mylonite (the A2 and A3 shears). The hole successfully intersected anomalous to strongly anomalous radioactivity in the A2 and A3 shears in association with stringers, disseminated, foliation-controlled, fracture-controlled, and semi-massive to massive pitchblende mineralization. A total composite mineralization of 89.5 m including 11.05 m of off-scale radioactivity (>10,000 to >61,000 cps) was intersected within a 217.5 m section (395.0 to 612.5 m). In the A2 shear, 72.0 m of composite mineralization including 11.05 m of off-scale radioactivity was intersected. An additional 17.5 m of composite mineralization was intersected in the A3 shear. The hole was terminated at a depth of 621.5 m.

AR-17-118c1

Hole AR-17-118c1 was a directional hole collared from the surface at an angled orientation (-70°) to the northwest (327° Azimuth). It was a scissor hole designed to test the A2 shear 75 m down-dip of AR-15-53c3 (1.38% U3O8 over 24.5 m, 3.37% U3O8 over 8.5 m, and 1.87% U3O8 over 9.5 m in the A2 shear) and the A3 shear 28 m southwest of AR-16-105c1 (2.93% U3O8 over 23.5 m and 2.31% U3O8 over 11.0 m in the A3 shear). Directional drilling was initiated at 201 m. The A2 and A3 shears were both intersected at an inclination of -68°.

The hole intersected bleached Athabasca Group sandstones between 123.0 m and the unconformity at 129.9 m. Basement lithologies dominantly consist of semi-pelitic gneiss with relatively narrow intervals of graphitic pelitic gneiss and mylonite (the A2 through A4 shears). The hole successfully intersected anomalously to strongly anomalous radioactivity in the A2 through A4 shears in association with stringers, disseminated, foliation-controlled, fracture-controlled, and semi-massive to massive pitchblende mineralization. A total composite mineralization of 86.5 m including 7.3 m of off-scale radioactivity (>10,000 to >61,000 cps) was intersected within a 376.5 m section (463.5 to 840.0 m). In the A2 shear, 18.5 m of composite mineralization including 0.2 m of off-scale radioactivity was intersected. In the A3 shear, 55.0 m of composite mineralization including 6.55 m of off-scale radioactivity was intersected. In the A4 shear, 13.0 m of composite mineralization including 0.55 m of of-scale radioactivity was intersected. The hole was terminated at a depth of 873.0 m.

AR-17-119c1

Hole AR-17-119c1 was a directional hole collared from the surface at an angled orientation (-67°) to the southeast (147° Azimuth). The hole was designed to test the A2 shear 90 m up-dip and northeast of AR-16-108c4 (0.92% U3O8 over 49.5 m in the A2 shear). Directional drilling was initiated at 201 m. The A2 shear was intersected at an inclination of -64°.

The hole intersected bleached Athabasca Group sandstones between 93.0 m and the unconformity at 119.5 m. Basement lithologies dominantly consist of semi-pelitic gneiss with relatively narrow intervals of graphitic pelitic gneiss and mylonite (the A1 through A3 shears). The hole successfully intersected anomalous to strongly anomalous radioactivity in the A1 through A3 shears in association with stringers, disseminated, foliation-controlled, fracture-controlled, and semi-massive to massive pitchblende mineralization. A total composite mineralization of 66.5 m including 1.5 m of off-scale radioactivity (>10,000 to >61,000 cps) was intersected within a 333.5 m section (354.0 to 687.5 m). In the A1 shear, 29.0 m of composite mineralization was intersected. In the A2 shear, 21.5 m of composite mineralization including 1.15 m of off-scale radioactivity was intersected. An additional 16.0 m of composite mineralization including 0.35 m of off-scale radioactivity was intersected in the A3 shear. The hole was terminated at a depth of 825.5 m.

Technical Information

Natural gamma radiation in drill core reported in this news release was measured in counts per second (cps) using a Radiation Solutions Inc. RS-120 gamma-ray scintillometer. 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. All intersections are 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 estimated. 

Split core samples will be taken systematically, and intervals will be submitted to SRC Geoanalytical Laboratories (an SCC ISO/IEC 17025: 2005 Accredited Facility) of Saskatoon for analysis. All samples sent to SRC will be analyzed using ICP-MS for trace elements on partial and total digestions, ICP-OES for major and minor elements on a total digestion, and fusion solution of boron by ICP-OES. Mineralized samples are analyzed for U3O8 by ICP-OES and select samples for gold by fire assay. Assay results will be released when received and after stringent internal QA/QC protocols are passed.

All scientific and technical information in this news release has been prepared by or reviewed and approved by Mr. Garrett Ainsworth, P.Geo., Vice President – Exploration & Development for NexGen. Mr. Ainsworth is a qualified person for the purposes of National Instrument 43-101 Standards of Disclosure for Mineral Projects ("NI 43-101"), and has verified the sampling, analytical, and test data underlying the information or opinions contained herein by reviewing original data certificates and monitoring all of the data collection protocols.

For details of the Rook I Project including the quality assurance program and quality control measures applied and key assumptions, parameters and methods used to estimate the mineral resource set forth below please refer to the technical report entitled "Technical Report on the Rook 1 Property, Saskatchewan, Canada" dated effective April 13, 2016 (the "Rook 1 Technical Report") prepared by Mark B. Mathisen and David Ross, each of whom is a "qualified person" under NI 43-101. The Rook I Technical Report is available for review under the Company's profile on SEDAR at www.sedar.com.

About NexGen

NexGen is a British Columbia corporation with a focus on the acquisition, exploration and development of Canadian uranium projects. NexGen has a highly experienced team of uranium industry professionals with a successful track record in the discovery of uranium deposits and in developing projects through discovery to production.

NexGen owns a portfolio of highly prospective uranium exploration assets in the Athabasca Basin, Saskatchewan, Canada, including a 100% interest in Rook I, location of the Arrow Discovery in February 2014 and Bow Discovery in March 2015 and the Harpoon discovery in August 2016. The Arrow Deposit's maiden Inferred mineral resource estimate is 201.9 M lbs U3O8 contained in 3.48 M tonnes grading 2.63% U3O8.

This news release contains "forward-looking information" within the meaning of applicable Canadian securities legislation.  "Forward-looking information" includes, but is not limited to, statements with respect to the activities, events or developments that the Company expects or anticipates will or may occur in the future, including, without limitation, planned exploration activities and the completion of an updated mineral resource estimate. 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.

Such forward-looking information and statements are based on numerous assumptions, including among others, that the results of planned exploration activities are as anticipated, the price of uranium, the anticipated cost of planned exploration activities, that general business and economic conditions will not change in a material adverse manner, that financing will be available if and when needed and on reasonable terms, and that third party contractors, equipment and supplies and governmental and other approvals required to conduct the Company's planned exploration activities will be available on reasonable terms and in a timely 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.

Forward-looking information and statements also involve known and unknown risks and uncertainties and other factors, which may cause actual events or results in future periods to differ materially from any projections of future events or results expressed or implied by such forward-looking information or statements, including, among others: negative operating cash flow and dependence on third party financing, uncertainty of additional financing, no known mineral reserves, assay results may not be consistent with preliminary results, alternative sources of energy, aboriginal title and consultation issues, reliance on key management and other personnel, potential downturns in economic conditions, actual results of exploration activities being different than anticipated, changes in exploration programs based upon results, availability of third party contractors, availability of equipment and supplies, failure of equipment to operate as anticipated; accidents, effects of weather and other natural phenomena and other risks associated with the mineral exploration industry, environmental risks, changes in laws and regulations, community relations and delays in obtaining governmental or other approvals.

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 implied by forward-looking information, there may be other factors that cause results not to be as anticipated, estimated or intended. 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.

SOURCE NexGen Energy Ltd.

For further information: Leigh Curyer, Chief Executive Officer, NexGen Energy Ltd., +1 604 428 4112, lcuryer@nexgenenergy.ca, www.nexgenenergy.ca; Travis McPherson, Corporate Development Manager, NexGen Energy Ltd., +1 604 428 4112, tmcpherson@nexgenenergy.ca, http://www.nexgenenergy.ca

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