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NexGen Energy Announces Best Assays from Patterson Corridor East in Hole RK-25-232

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  • RK-25-232 assays returned NexGen's best discovery phase intercept to date: 15.0 m at 15.9% U3O8 including 3.0 m at 47.8%, 1.5 m at 29.4% and an intercept of 0.5 m at 68.8%

  • Ranks among the world's highest-grade basement-hosted uranium vein intercepts, validating the growing significance of Patterson Corridor East ("PCE")

  • Exceptional continuity confirmed, with RK-24-222 intersecting 17.0 m at 3.85% U3O8, located 200 m from RK-25-232

  • Winter 2025 drill program added 9 new high-grade intercepts, reinforcing the scale and strength of the system

Vancouver, British Columbia--(Newsfile Corp. - May 27, 2025) - NexGen Energy Ltd. (TSX: NXE) (NYSE: NXE) (ASX: NXG) ("NexGen" or the "Company") is thrilled to announce the Company's best discovery phase assay results, with 15.0 meters (m) at 15.9% U3O8, including a peak intercept of 0.5 m at an exceptional 68.8% U3O8, in drillhole RK-25-232. Included within this phenomenal intercept is 3.0 m at 47.8% U3O8 and 1.5 m at 29.4% U3O8. This result ranks among the highest-grade basement hosted uranium vein intercepts in the world.

Assay results from two of the best holes drilled to date at PCE, RK-24-222 and RK-25-232, indicate intense high-grade mineralization 200 m apart (Figures 1 and 2, Tables 1 and 2), confirming scale and continuity early in the discovery phase. Winter activity since the last update continued to build momentum, adding 9 new intersections of off-scale (>61,000 cps) mineralization, bringing the total to 13 high-grade intercepts and reinforce confidence in the materiality of this emerging mineralization. Since discovery (see March 11, 2024, news release), 64 drillholes totalling 47,425.9 m have been completed, with 35 intersecting mineralization that remains open in most directions.

Further, RK-24-222 returned 17.0 m at 3.85% U3O8 including 3.0 m at 10.1% U3O8 and an intercept of 0.5 m at 28.2% U3O8 within massive replacement style uranium mineralization. These results are accelerating NexGen's understanding of the PCE system and shaping the next phase of exploration targeting. Assays at SRC lab continue to see backlogs with NexGen now having received 75% of the 2024 assay results. Remaining will follow as they are received back from the independent lab. Drilling at PCE will resume on June 1st, 2025, and reporting of 2025 assays will be completed on an ongoing basis.

Leigh Curyer, Chief Executive Officer, commented: "Patterson Corridor East has delivered these exceptional assay results. RK-25-232 is an exceptionally high calibre intersection considering the program is very early in the evaluation of PCE.

Identical to Arrow, mineralization at PCE is wholly hosted in competent basement rock and exhibits all the same characteristics of an intense high-grade mineralized system. PCE is only 3.5 km from the future Rook I Project that is in the final Federal approval stage with the CNSC having received Provincial Approval in November 2023.

The scale of 2025 program drilling at PCE underscores NexGen's commitment to advancing new sources of uranium supply at a time the world is committing to the deployment of nuclear energy. Notably, President Trump last Thursday, signing four executive orders to immediately accelerate the deployment of nuclear energy in the US, with objective of increasing US nuclear energy output from 100GW to 400GW by 2050. The importance of Rook I and the further development of PCE has never been greater to meet the world's nuclear fuel requirements for the approaching decades."

Jason Craven, Vice President, Exploration, commented: "These assays received to date confirm advancement of our 3D model of PCE which sets us up for targeting future drill hole locations at PCE. The focus to both expand the overall footprint as well as define and expand the high-grade sub-domains within PCE. Mineralization style and intensity, mirrored with Arrow 3.5 km away, speaks to the broader endowment of the underexplored NexGen portfolio in southwest Athabasca Basin. NexGen provides everyone with the tremendously unique opportunity of building a true tier one mine whilst simultaneously developing the exciting PCE."

Other Highlights

  • RK-24-207 returned 9.5 m at 2.91% U3O8 including 0.5 m at 28.2% U3O8, located approximately 79 m from RK-25-232 and 82 m from RK-24-222.
  • RK-25-239 and RK-25-244 intersected 10.3 m containing >10,000 cps including 1.1 m of cumulative >61,000 cps, and 7.5 m containing >10,000 cps including 2.6 m of cumulative >61,000 cps, respectively. Although assays are pending, RK-25-239 and RK-25-244 speak to the consistency of the system and repeatability of uranium mineralization that is further substantiated by the exceptional assay results of RK-25-232 and RK-24-207.

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Table 1: 2025 Assay results received since March 24, 2025 news release to present

DrillholeUnconformity Depth (m)SRC Geoanalytical Results
(Cutoff 0.01%)
Hole IDAzimuthDipTotal Depth (m)From
(m)		To
(m)		Width
(m)		U3O8
(wt%)
RK-25-225330-70684108.6Assays Pending
RK-25-226330-70655.5N/AAssays Pending
RK-25-227330-70657113.4Assays Pending
RK-25-228330-75609117.1Assays Pending
RK-25-229350-70681.4113.2Assays Pending
RK-25-230330-70598112.5Assays Pending
RK-25-231329-69.5885102.7Assays Pending
RK-25-232330-70552.4112.538838910.01
     392.53963.50.04
     40840910.05
     409.5413.540.04
     414.54150.50.01
     426.54281.50.02
     431431.50.50.01
     433433.50.50.01
     43543830.05
     440452Assays Pending
     4524671515.9
    incl.458.5461.5347.8
    incl.459.54600.568.8
    incl.463.54651.529.4
     467542Assays Pending
RK-25-233330-70694109.7Assays Pending
RK-25-234330-70747113Assays Pending
RK-25-235270-70858105.5Assays Pending
RK-25-236267-65541129Assays Pending
RK-25-237340-70816104.6No Significant Intersections
RK-25-238a279-67165123.4No Significant Intersections
RK-25-239278-68594123.4Assays Pending
RK-25-240270-70893106.1Assays Pending
RK-25-241320-71534117.2Assays Pending
RK-25-242270-70555124.5Assays Pending
RK-25-243276-66579126.8Assays Pending
RK-25-244330-70586.6112.4Assays Pending
  • All depths and intervals are meters downhole, true thicknesses are yet to be determined.
  • 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.
  • Cutoff grade 0.01% U3O8.
  • 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: 2024 Assays received since May 29, 2024

Drillhole Unconformity Depth (m) SRC Geoanalytical Results
(Cutoff 0.01%)
Hole IDAzimuthDipTotal Depth (m)From
(m)		To
(m)		Width
(m)		U3O8
(wt%)
RK-24-193310-70621N/A383.5385.520.06
     389.53900.50.09
     393.53940.50.02
     400.5403.530.03
     40640710.03
     412.54141.50.03
     416.54192.50.18
     419.54200.50.81
     420.54254.50.23
     426.54281.50.18
     428.54290.50.06
     429.54311.50.51
     43243740.73
     442.54430.50.08
     44945120.16
RK-24-194310-7042098.8No Significant Intersections
RK-24-195310-70588.0N/ANo Significant Intersections
RK-24-196310-70841.0103.4702704.52.50.90
     705.57060.50.02
     723.57240.50.05
     73173320.35
    incl.731.57320.51.19
     734.57350.50.01
     741741.50.50.24
     742.57430.50.01
     744.57472.50.25
     747.57480.50.03
     748.5750.520.09
     751751.50.50.01
     754.5755.510.01
     757757.50.50.07
     758758.50.50.02
     760.57610.50.01
     765.57660.50.03
RK-24-197310-70792.0117.7518518.50.50.01
     521522.51.50.02
     523.55306.50.97
    incl.526.55292.52.26
     53153210.02
     532.5534.520.03
     544545.51.50.01
     54655480.61
    incl.548.55490.53.97
    incl.552.55530.54.53
     554.55550.50.01
     55655710.01
RK-24-198310-70743.2117.3No Significant Intersections
RK-24-199310-70807.0107.1No Significant Intersections
RK-24-200310-70804.0112.6611611.50.50.03
     612612.50.50.01
     613613.50.50.03
     61962010.01
     623623.50.50.02
RK-24-201310-70939.0108.9673.56740.50.03
     674.56761.50.07
     677.56780.50.02
     678.5679.510.04
     680.56810.50.02
     694.5697.530.09
     69869910.01
     699.57043.50.04
     708708.50.50.03
     721.57220.50.01
     765.57660.50.03
     819819.50.50.03
     822.58230.50.02
     867.58680.50.01
RK-24-202310-701138.2106.3886886.50.50.02
     887.58880.50.03
     895.58960.50.45
     92292310.01
     926.59270.50.05
     927.5928.510.10
     931932.51.50.23
     933.5934.513.49
    incl.934934.50.56.96
     936936.50.52.44
     943.5944.510.12
     951.59520.52.37
     966966.50.51.46
     967.59680.52.75
     976.59770.50.01
     980980.50.50.31
     981981.50.50.06
     98398630.25
     996.59970.50.02
     997.5998.510.14
     1005100720.06
     10091009.50.50.01
     1016.51017.510.04
     1026.51028.520.03
RK-24-203310-70738.0103.7No Significant Intersections
RK-24-204290-70822.0110.155156390.06
     574602210.31
    incl.575575.50.51.19
    incl.58158211.67
    incl.587.55880.51.10
RK-24-205320-701032.0109.17427483.50.16
     7667765.30.11
     779.5780.510.01
     783.5795.511.50.14
     802808.530.03
     853.58540.50.04
RK-24-206298-751377.096.5No Significant Intersections
RK-24-207330-70801.0114.950450620.05
     506.5507.510.03
     508508.50.50.03
     509510.51.50.05
     511511.50.50.01
     51451840.09
     519535161.83
    incl.522531.59.52.91
    incl.525525.50.528.2
     53653820.62
     538.55390.50.09
     539.55400.50.01
     54054110.88
     553.5554.510.03
     557.55591.50.02
     560560.50.50.01
     567.55680.50.05
     572.55730.50.03
     581.55820.50.04
     582.55830.50.01
     583.5584.510.03
     585.55860.50.12
     588588.50.50.01
     59559610.03
     596.55970.50.01
     600.56010.50.01
     60360410.02
     616.56170.50.03
     619619.50.50.06
     62662710.03
     636636.50.50.01
     640640.50.50.01
     644645.51.50.03
     717.5718.510.12
     729730.51.50.46
     730.5734Assays Pending
RK-24-208310-70756104.3Assays Pending
RK-24-209310-70840110.7Assays Pending
RK-24-210310-701095102.4Assays Pending
RK-24-211310-701302103.1Assays Pending
RK-24-212315-70137121No Significant Intersections
RK-24-213310-7093687No Significant Intersections
RK-24-214310-70989111.6Assays Pending
RK-24-215310-70840114.8Assays Pending
RK-24-216310-70107199.778778920.21
     789.57911.50.09
     790.57910.50.01
     791.57920.50.04
     80580610.05
     807.5808.510.02
     811.58120.50.76
     814.58172.50.17
RK-24-217310-701185105.6No Significant Intersections
RK-24-217a310-70120105.1No Significant Intersections
RK-24-218310-70696109.6494.5495.510.03
     515.55193.50.09
     52052110.01
RK-24-219310-70118799.8No Significant Intersections
RK-24-220310-70732116445.54471.50.04
     450450.50.50.01
     452469170.43
    incl.457457.50.51.52
    incl.457.54580.53.30
    incl.462.5463.511.06
    incl.465.54660.51.26
     469.54700.50.01
     471471.50.50.02
     475.5488.5130.32
    incl.484.54850.51.16
    incl.485485.50.52.35
    incl.486486.50.52.18
     48949450.20
     494.5499.550.38
     500500.50.50.01
     503504.51.50.05
     520.55210.50.02
     521.55220.50.02
     522.55230.50.01
     525.5526.510.01
     539.55400.50.52
     544.55461.50.02
     570.55710.50.02
     579.55811.50.04
     583584.51.50.07
     585.55860.50.01
     596.5597.510.12
     599.56000.50.03
RK-24-221310-70861.6115.9Assays Pending
RK-24-222354-65753108.4587.5604.5Assays Pending
     604.5621.5173.85
    incl.607610310.1
     621.5688Assays Pending
RK-24-223345-66876106.8633635.52.51.90
    incl.633.56340.58.56
     645.5647.521.41
    incl.646.5647.512.21
     675676.51.50.42
     678678.50.50.02
     679.56800.50.06
     689.5693.540.93
     695.56971.50.05
     701.57020.50.01
     702.57030.50.01
     703703.50.50.01
     705705.50.50.01
     707.57080.50.01
     713.57140.50.07
     714.5715.510.03
     716718.52.50.25
     720.5721.510.09
     722723.51.51.18
    incl.723723.50.52.15
     726727.51.50.34
     728.5764.5Assays Pending
     764.57683.50.57
     768.5777.5Assays Pending
RK-24-224310-70744115.8493504Assays Pending
     50450510.34
     505.55093.50.36
     509539Assays Pending
  • All depths and intervals are meters downhole, true thicknesses are yet to be determined.
  • 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.
  • Cutoff grade 0.01% U3O8.
  • 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 determined.

Table 4: 2025 Spectrometer results from March 24, 2025 news release to present

DrillholeUnconformity Depth (m)Handheld Spectrometer Results (RS-125)
Hole IDAzimuthDipTotal Depth
(m)		 From
(m)		To
(m)		Width
(m)		CPS Range
RK-25-235270-70858105.5No Significant Intersections.
RK-25-237340-70816.0104.6No Significant Intersections.
RK-25-238a279-67165123.4No Significant Intersections.
RK-25-239278-68594123.4212.52130.5<500 - 850
     3653661<500
     390.5391.51<500 - 800
     391.53920.5<500 - 2400
     392394.52.5<500
     394.53950.5<500 - 950
     395395.50.5<500 - 800
     395.53960.5<500
     396396.50.5<500 - 600
     396.53970.5500 - 1100
     397397.50.5<500
     398398.50.5<500 - 700
     398.53990.5<500 - 900
     400.5402.52<500
     405405.50.5<500
     406.54070.5<500
     407407.50.5700 - 1400
     407.54080.5700 - 14000
     4084091<500 - 700
     409409.50.5<500 - 3100
     409.54100.5<500 - 1200
     410410.50.5<500 - 700
     411411.50.5<500
     414414.50.5<500
     414.54150.5600 - 800
     415415.50.5<500
     416.5418.52<500
     418.54190.5<500 - 600
     419419.50.5<500
     419.5420.51<500 - 550
     420.5421.51<500
     422.54230.5<500
     424.54250.5<500
     425.54260.5<500
     428.5429.51<500
     430431.51.5<500
     432433.51.5<500
     433.54340.5<500 - 650
     434434.50.5<500 - 1100
     434.54350.5<500
     435435.50.5<500 - 600
     435.54360.5600 - 2000
     436436.50.5700 - 1000
     436.54370.52500 - 3500
     437437.50.57000 - 31000
     437.54380.512000 - 28000
     438438.30.317000 - 35000
     438.3438.40.1>61000
     438.4438.50.117000 - 32000
     438.54390.512000 - 49000
     439439.50.523000 - 51000
     439.54400.530000 - 40000
     440440.50.526000 - 41000
     440.5440.70.2>61000
     440.7440.90.236000 - 50000
     440.94410.1>61000
     441441.40.4>61000
     441.4441.60.230000 - 50000
     441.64420.410000 - 46000
     442442.50.510000 - 54000
     442.54430.53000 - 13000
     443443.50.53000 - 45000
     443.54440.51500 - 25000
     444444.50.52500 - 28000
     444.54450.5400 - 1350
     445445.50.5<500 - 800
     445.54460.5<500 - 700
     448449.51.5<500
     449.54500.5<500 - 700
     450450.50.5<500 - 600
     450.54510.5<500 - 700
     451451.50.5700 - 3500
     451.54520.5500 - 1100
     453454.51.5<500
     4564571<500
     458458.50.5<500
     461.54620.5<500
     463464.51.5<500
     466.54670.5<500
     468468.50.5<500 - 550
     468.54690.5<500
     469.54700.5<500 - 550
     470471.51.5<500
     471.54720.5<500 - 3200
     472472.50.51200 - 11000
     472.54730.51100 - 4600
     473473.50.5<500
     476476.50.5<500
     476.54770.5<500 - 600
     4774781<500
     478478.50.5<500 - 3100
     478.54790.5600 - 5000
     479479.50.5<500 - 1100
     480.5481.51<500
     482.54830.5<500
     483.54840.5<500
     4844851<500 - 550
     486486.50.5<500
     486.54870.5700 - 2000
     487487.50.51000 - 9000
     487.54880.5<500 - 1100
     490490.50.5<500
     490.5490.70.21500 - 4000
     490.74910.3>61000
     491491.50.51000 - 34000
     498498.50.5<500 - 580
     498.54990.5<500 - 960
     499499.50.5<500 - 2600
     499.55000.5<500 - 1200
     501.55020.5<500
     502.55030.5<500
     503.55040.51200 - 57000
     504504.50.51200 - 10000
     505.55060.5<500 - 800
     507.55080.5<500 - 5400
     508508.50.51100 - 4500
     509.55100.5<500
     514.55150.5<500 - 1400
     518.55190.5<500
     519519.50.5<500 - 600
     519.55200.5<500 - 1400
RK-25-240270-70893106.1653.5654.51.0<500
     658.56590.5<500
     659.56600.5<500
     660660.50.5<500 - 1000
     660.56610.5<500 - 650
     661661.50.5<500 - 5400
     661.56620.5<500
     6626631.0<500 - 1000
     663663.50.5<500 - 950
     663.56640.5<500 - 800
     664664.50.53400 - 19000
     664.56650.5<500 - 700
     665665.50.5600 - 3300
     665.56660.5700 - 33000
     666666.50.5500 - 1200
     666.56670.5700 - 2200
     667667.50.51200 - 2900
     667.56680.5<500 - 1200
     668668.50.51100 - 8600
     668.5669.51.0<500 - 1400
     669.56700.5<500
     670670.50.51100 - 3900
     670.56710.5<500 - 600
     671.56720.5<500 - 700
     672672.50.5<500 - 1200
     673673.50.5<500 - 6000
     673.56740.5<500 - 3200
     675675.50.5900 - 15000
     675.56760.5500 - 1700
     676676.50.5500 - 1800
     676.56770.5<500 - 1300
     677677.50.5<500 - 600
     677.56780.5500 - 900
     678678.50.5<500 - 1800
     678.56790.5<500
     679679.50.5600 - 3000
     679.56800.5<500
     680680.50.5<500 - 550
     680.56810.5600 - 1100
     681681.50.5600 - 3200
     681.56820.5600 - 2300
     682682.50.5500 - 600
     682.56830.5500 - 700
     683683.50.5<500 - 550
     683.56840.5<500
     684684.50.5700 - 3000
     684.56850.53600 - 12000
     685685.10.14000 - 8000
     685.1685.60.5>61000
     685.6685.80.215000 - 20000
     685.86860.2>61000
     686686.50.51000 - 5500
     686.56870.57000 - 47000
     687687.50.52200 - 25000
     687.56880.51000 - 3800
     688688.50.5600 - 1500
     688.56890.5<500 - 1000
     689689.50.5500 - 700
     689.56900.5<500
     690690.50.5<500 - 1100
     690.56910.51200 - 1500
     691691.50.5700 - 1000
     691.56920.5800 - 1100
     692692.50.5<500 - 800
     692.5693.51.0<500
     694.56950.5<500
     695695.50.5<500 - 750
     695.5696.51.0<500 - 800
     696.56970.5<500 - 700
     697697.50.5<500
     697.56980.5<500 - 550
     698698.50.51000 - 4600
     698.56990.5<500 - 900
     699.57000.5500 - 1000
     700700.50.5<500 - 1300
     700.57032.5<500
     703703.50.5<500 - 700
     703.57040.5<500 - 550
     705.57060.5<500
     706706.50.5<500 - 3500
     714.57150.5550 - 10000
     715715.50.5<500
     717.57180.5500 - 1300
     718.57223.5<500
     726.57270.5<500 - 800
     7287302.0<500
     730730.50.5<500 - 550
     731731.50.5<500
     732.57330.51100 - 11000
     733733.50.54000 - 7000
     733.57340.5<500 - 9000
     734734.50.5<500
     734.57350.5<500 - 550
     735735.50.5<500 - 6100
     735.57360.5800 - 25000
     736736.50.5<500 - 1500
     736.57370.5<500 - 540
     7377381.0<500 - 600
     738738.50.56000 - 20000
     738.57390.5750 - 10000
     739739.50.5<500
     739.57400.5<500 - 1100
     740740.50.5<500 - 600
     740.57410.5<500 - 550
     741741.50.5600 - 2500
     741.57420.5500 - 4600
     742742.50.5<500 - 700
     742.5742.90.4<500
     749.5750.51.0<500
     752.57530.5<500 - 900
     754.57550.5<500
     755755.50.5<500 - 780
     755.57560.5<500 - 620
     756.57570.5<500 - 520
     757759.52.5<500
     760760.50.5<500 - 980
     760.57610.5530 - 1050
     761761.50.5500 - 1800
     761.57620.5<500
     762762.50.5830 - 8400
     762.57630.5530 - 2200
     763763.50.5890 - 2700
     763.57640.5260 - 1200
     764.57650.51000 - 1700
     765765.50.5600 - 1900
     765.57660.5<500 - 1000
     766.57670.5<500 - 850
     767767.50.5<500 - 1500
     774774.50.52000 - 5000
     774.57750.5<500 - 1100
     775775.50.51100 - 2700
     775.57760.5<500 - 2100
     776.57770.5<500 - 1100
     778778.50.5<500 - 1100
     780780.50.52500 - 7000
     798.57990.5<500 - 8400
     804.58050.5<500 - 560
RK-25-241320-71534117.2396396.50.5<500 - 650
     396.53970.5<500
     413413.50.5<500 - 850
     413.54140.5<500 - 2500
     414414.50.5<500 - 800
     414.54150.5<500 - 1700
     415415.50.5<500
     415.54160.5<500
     416416.50.5<500 - 6500
     416.54170.5<800 - 2000
     417417.50.51000 - 3500
     417.54180.52000 - 11000
     418418.50.53500 - 11000
     418.54190.51000 - 6500
     419419.50.5<500
     421421.50.5<500
     423.54240.5<500
     424424.50.5<500 - 1500
     424.54250.5<500 - 600
     425425.50.5<500 - 1100
     425.54260.5<500 - 700
     426426.50.5<500
     427.5428.51.0<500
     428.54290.5<500 - 600
     432432.50.5<500 - 700
     432.54330.5<500
     434434.50.5<500
     434.54350.5500 - 800
     435436.51.5<500
     436.54370.5<500 - 700
     437437.50.5<500 - 550
     437.54380.5<500
     438438.50.5<500 - 550
     439.54400.5<500 - 550
     440440.50.5<500 - 2000
     444444.50.5<500 - 900
     447.5448.51.0<500
     448.54490.5<500 - 1100
     449449.50.58000 - 54000
     449.54500.515000 - 26000
     450450.50.54000 - 15000
     450.54510.5<500 - 1500
     451451.50.5<500
     451.54520.5<500
     452452.50.5<500 - 550
     452.54541.5<500
     454454.50.5500 - 1200
     454.54550.5500 - 5000
     455455.50.51500 - 34000
     455.54560.5500 - 1100
     456456.50.5500 - 1500
     456.54570.5500 - 1100
     461461.50.5<500
     462462.50.5<500
     462.54630.5<500 - 1000
     463463.50.5<500
     463.54640.5<500 - 1100
     464464.50.5800 - 1200
     464.54650.5<500
     465465.50.5<500 - 550
     466466.50.5<500
     467467.50.5<500
     471471.50.5<500
     489489.50.5<500
     496496.50.5<500
     497.54980.5<500
     498498.50.5<500 - 520
     501501.50.5<500 - 850
     503503.50.5<500 - 700
RK-25-242270-70555.00124.50No Significant Intersections.
RK-25-243276-66579.00126.80207.52080.5<500 - 690
     208208.50.5<500
     360364.54.5<500
     365365.50.5<500 - 1000
     365.53660.5650 - 1200
     366366.50.5<500 - 1200
     366.53670.5<500 - 2500
     367367.50.5<500 - 4000
     367.53680.5<500 - 850
     368368.50.51000 - 25000
     368.53690.5<500 - 16000
     371371.50.5<500 - 800
     371.53720.5<500
     372372.50.5<500
     372.53730.5<500 - 800
     373373.50.5<500 - 1000
     374374.50.5<500 - 700
     375375.50.5<500
     376.53770.5<500 - 750
     384.53850.5<500 - 900
     385385.50.5<500
     385.53860.5<500 - 800
     386386.50.5<500 - 1000
     386.53870.5<500 - 900
     387387.50.5<500 - 3500
     400.54010.5<500
     4024031.0<500
     404.54061.5<500
     406406.50.5<500 - 1000
     406.5407.51.0<500
     409409.50.5<500 - 940
     409.54100.5<500 - 1900
     410410.50.5<500 - 650
     410.54110.5<500
     411411.50.5<500 - 3900
     411.5414.53.0<500
     417417.50.5<500 - 800
     417.54180.5<500 - 1550
     418418.50.5<500 - 850
     418.54190.5<500 - 1100
     4194201.0<500
     421.54220.5<500
     422422.50.5<500 - 600
     422.54241.5<500
     424424.50.5<500 - 1100
     424.54250.5600 - 1100
     425425.50.51500 - 2400
     425.54260.5500 - 2600
     426426.50.51100 - 11000
     426.54270.5<500
     432433.51.5<500
     433.54340.5<500 - 550
     434434.50.5<500 - 1100
     434.54350.5<500 - 580
     435435.50.5<500
     435.54360.5900 - 1100
     436436.50.5<500 - 1300
     436.54370.5<500
     446.54470.5<500 - 720
     452452.50.5<500
     453453.50.5<500
     453.54540.5<500 - 950
     455.54560.5<500 - 660
     4564571.0<500
     459.5460.51.0<500
     472472.50.5<500 - 3200
     473473.50.5<500
     475475.50.5<500
     476.54770.5<500
     478478.50.5<500
     480480.50.5<500 - 7500
     480.54810.5<500 - 650
     481481.50.5<500
     481.54820.5<500 - 1800
     482482.50.5<500
     488488.50.5<500
     488.54890.5<500 - 4500
     489489.50.5<500
     489.54900.5<500 - 730
     490490.50.5<500 - 1500
     490.54910.5<500 - 700
     503503.50.5<500 - 1300
RK-25-244330-70586.60112.40412412.50.5<500 - 920
     412.54130.51100 - 4400
     413413.50.5<500 - 620
     4144151.0<500
     420.54210.5<500
     421.54220.5<500 - 780
     422422.50.5<500 - 830
     422.54230.5<500 - 660
     423423.50.5<500 - 950
     423.54240.5<500 - 920
     424424.50.5<500 - 540
     424.54250.5<500
     427.54280.5<500
     428428.50.5<500 - 6400
     428.54290.5<500
     430430.50.5<500
     434434.50.5<500
     453.54540.5<500
     4544551.0<500
     455455.50.5<500 - 700
     455.54560.5<500 - 2400
     456.5458.52.0<500
     458.54590.5<500 - 1800
     459459.50.5<500
     462464.52.5<500
     464.54650.5<500 - 1900
     465465.50.51100 - 3600
     465.54660.5910 - 1800
     466466.50.5<500 - 1400
     466.54670.5880 - 7000
     467467.50.5780 - 3500
     467.54680.5550 - 700
     468468.50.51200 - 17000
     468.54690.51500 - 24000
     469469.50.5<500 - 1400
     469.54700.5<500 - 540
     470470.50.5<500 - 830
     470.54710.5<500
     471471.50.5<500 - 1400
     471.54720.5720 - 1600
     472472.50.51500 - 13000
     472.54730.57000 - 30000
     473473.20.220000 - 55000
     473.2473.50.3>61000
     473.54740.57000 - 40000
     474474.50.54500 - 9000
     474.54750.51300 - 26000
     475475.10.19000 - 26000
     475.1475.40.3>61000
     475.4475.50.119000 - 41000
     475.5477.31.8>61000
     477.3477.40.110000 - 15000
     477.4477.60.2>61000
     477.64780.410000 - 21000
     478478.50.5720 - 1500
     478.54790.5<500 - 800
     4794801.0<500
     480480.50.5<500 - 4400
     480.54810.5550 - 5100
     481481.50.5520 - 5700
     481.54820.5600 - 60000
     482482.50.5<500 - 750
     482.54863.5<500
     489.54900.5<500
     490490.50.5<500 - 630
     490.54910.5<500 - 680
     497497.50.5<500
     497.54980.5<500 - 710
     499499.50.5<500
     5105111.0<500
     528528.50.5<500
     528.55290.5<500 - 1400
     529529.50.5700 - 14000
     529.55300.5<500 - 7200
     530530.50.5<500 - 3200
     530.55310.51000 - 5600
     531531.50.5<500
  • All depths and intervals are meters downhole, true thicknesses are yet to be determined.
  • "Off-scale" refers to >61,000 cps (counts per second) readings by gamma spectrometer type RS-125.
  • "Anomalous" means >500 cps readings by gamma spectrometer type RS-120.
  • Where "CPS Range" is <500 cps, this refers to local low radioactivity within the overall interval.
  • Unconformity of 'N/A' denotes a lack of visible contact between Athabasca sandstone and basement rock.
  • Maximum internal dilution 2.0 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 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 environmental and social governance standards. The Rook I Project is supported by an N.I. 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.

Contact Information

Leigh Curyer
Chief Executive Officer
NexGen Energy Ltd.
+1 604 428 4112
lcuryer@nxe-energy.ca
www.nexgenenergy.ca

Travis McPherson
Chief Commercial Officer
NexGen Energy Ltd.
+1 604 428 4112
tmcpherson@nxe-energy.ca
www.nexgenenergy.ca

Monica Kras
Vice President, Corporate Development
NexGen Energy Ltd.
+44 7307 191933
mkras@nxe-energy.ca
www.nexgenenergy.ca

Technical Disclosure*

All technical information in this news release has been reviewed and approved by Jason Craven, NexGen's Vice President, 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.sedarplus.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 3, 2025 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.sedarplus.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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