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

By: Newsfile
  • 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

Drillhole Unconformity Depth (m) SRC Geoanalytical Results
(Cutoff 0.01%)
Hole ID Azimuth Dip Total Depth (m) From
(m)
To
(m)
Width
(m)
U3O8
(wt%)
RK-25-225330-70684108.6Assays Pending
RK-25-226330-70655.5N/A Assays 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 ID Azimuth Dip Total Depth (m) From
(m)
To
(m)
Width
(m)
U3O8
(wt%)
RK-24-193310 -70 621 N/A 383.5385.520.06





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 -70 420 98.8 No Significant Intersections
RK-24-195310 -70 588.0 N/A No Significant Intersections
RK-24-196310 -70 841.0 103.4 702704.52.50.90





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 -70 792.0 117.7 518518.50.50.01





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 -70 743.2 117.3 No Significant Intersections
RK-24-199310 -70 807.0 107.1 No Significant Intersections
RK-24-200310 -70 804.0 112.6 611611.50.50.03





612612.50.50.01





613613.50.50.03





61962010.01





623623.50.50.02
RK-24-201310 -70 939.0 108.9 673.56740.50.03





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 -70 1138.2 106.3 886886.50.50.02





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 -70 738.0 103.7 No Significant Intersections
RK-24-204290 -70 822.0 110.1 55156390.06





574602210.31




incl.575575.50.51.19




incl.58158211.67




incl.587.55880.51.10
RK-24-205320 -70 1032.0 109.1 7427483.50.16





7667765.30.11





779.5780.510.01





783.5795.511.50.14





802808.530.03





853.58540.50.04
RK-24-206298 -75 1377.096.5 No Significant Intersections
RK-24-207330 -70 801.0 114.9 50450620.05





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 -70 756 104.3 Assays Pending
RK-24-209310 -70 840 110.7 Assays Pending
RK-24-210310 -70 1095 102.4 Assays Pending
RK-24-211310 -70 1302 103.1 Assays Pending
RK-24-212315 -70 137 121 No Significant Intersections
RK-24-213310 -70 936 87 No Significant Intersections
RK-24-214310 -70 989 111.6 Assays Pending
RK-24-215310 -70 840 114.8 Assays Pending
RK-24-216310 -70 1071 99.7 78778920.21





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 -70 1185 105.6 No Significant Intersections
RK-24-217a310 -70 120 105.1 No Significant Intersections
RK-24-218310 -70 696 109.6 494.5495.510.03





515.55193.50.09





52052110.01
RK-24-219310 -70 1187 99.8 No Significant Intersections
RK-24-220310 -70 732 116 445.54471.50.04





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 -70 861.6 115.9 Assays Pending
RK-24-222354 -65 753 108.4 587.5604.5Assays Pending





604.5621.5173.85




incl.607610310.1





621.5688Assays Pending
RK-24-223345 -66 876106.8 633635.52.51.90




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 -70 744115.8 493504Assays 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.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/253463

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