NexGen Announces Additional Mineralization Discovered at Patterson Corridor East, Assays from RK-24-183 and Commencement of Expanded Summer Exploration Program
NexGen Announces Additional Mineralization Discovered at Patterson Corridor East,
Assays from RK-24-183 and Commencement of Expanded Summer Exploration Program
Vancouver, BC, May 29, 2024 – NexGen Energy Ltd. ("NexGen" or the "Company") (TSX: NXE) (NYSE:
NXE) (ASX: NXG ) is pleased to announce drilling at Patterson Corridor East (“ PCE”) has intersected
mineralization in RK-24-193 over 67.5 metres (m) (383.5 to 451 m) across various intervals including up to
7,500 cps over 1.5 m (Figures 1 to 4, Table 1). RK-24-193 is located 275 m southwest along strike of RK -
24-183 (discovery hole) and at approximately the same depth below surface.
In addition, assays from RK -24-183 confirm high grade uranium veins across a 20 m interval with several
intersections totalling 13.5 m at 0.78% U3O8 including 0.5 m (348.0 to 348.5 m) at 10% U3O8 and another
0.5 m (356.5 to 357 m) at 6.23% U3O8 (Table 2). For reference, the Arrow discovery hole RK-14-21 assayed
5.75 m at 0.37% U3O8, including 0.25 m at 5.77% U3O8.
Collectively, these results of multiple narrow intersections of mineralization in two holes represent a current
strike length of 275 m at PCE, suggesting a potential upper edge to mineralization highly analogous to the
early holes at Arrow (Figure 1). Consequently, the summer drilling program ha s been expanded to 4 drill
rigs and targeting 22,000 m at PCE (Figure 2).
Figure 1: Schematic cross-section showing early holes at Arrow and PCE with relative depths of mineralization;
follow up will primarily focus on blue shaded area down dip and along strike
Figure 2: PCE showing with area of interest for further exploration outlined; 2024 drillholes shown as green dots,
interpreted primary structures are represented by dashed lines
Leigh Curyer, Chief Executive Officer, commented: “Our team ha s assessed the g eological similarities
between RK-24-183 and RK-24-193 and the upper areas of Arrow, which indicates the high prospectivity of
an additional mineralized system 3.5 km east of Arrow . Consequently, the growing potential of this latest
discovery will drive the focus of the summer exploration program to determine the potential size and extent
of mineralization. Efficient and bold testing of the overall system is the first priority.
It is an exciting time at NexGen with the Company recently advancing the Federal Environmental
Assessment process for the Rook I Project through the submission of responses to the remaining
Information Requests, as well as advancing detailed engineering and exploring a new discovery in parallel.”
RK-24-193
This new hole intersected elevated radioactivity over 67.5 m (Table 1) with mineralization style and alteration
intensity strongly resembling up dip projections that were seen during the early discovery holes at Arrow.
In addition, drill results further south in RK-24-180, RK-24-192, and RK-24-194 indicate a possible repetition
of prospective structure that correlates well with the local gravity low , a typical indicator of potential
hydrothermal alteration. Numerous brittle reactivated structures and associated intense alteration within
these three drillholes highlight a potential supplementary uranium -bearing trend within the same system .
This has doubled the size of the system to be tested this summer with an approximate extent of 1.5
km long by 1.2 km wide (Figure 2). Potential remains in most directions within this highly prospective area.
Figure 3: Elevated radioactivity from RK-24-193 with maximum values shown for mineralized veins outlined in yellow.
Replacement style mineralization is similar to the discovery hole, RK-24-183, with a notable upgrade of alteration
intensity that included m-scale dravitic breccia.
Figure 4: Hydrothermal hematite, argillization, and uraninite blebs at 419.7 m with a maximum of 7,500 cps
Summer Drilling
Focus of the expanded summer program is on assessing the broad hydrothermal system at PCE (Figure 2)
and expanding the mineralized footprint. Robust analysis and interpretation processes will be utilized to
actively assess potential while efficiently testing priority targets.
Over 22,000 m of diamond drilling is planned for the PCE system utilizing four drill rigs. This represents a
near tripling of drilling from the winter to summer program . Optionality exists with planning underway to
increase the total based on drill results . Targets will primarily be tested between 400 and 700 m below
surface to test potential depth extensions, as is present at Arrow. Summer drilling will significantly advance
the investigation of PCE while highlighting geological relationships that can be a pplied elsewhere within
NexGen’s exploration portfolio (Figure 5).
Figure 5: PCE and analogs, based on geological and geophysical similarities, shown as green shapes
Table 1: 2024 Spectrometer results to date
Drillhole
Unconformity
Depth (m)
Handheld Spectrometer Results (RS-125)
Hole ID Azimuth Dip
Total
Depth
(m)
From
(m) To (m) Width
(m) CPS Range
RK-24-179 310 -70 462 138 141 141.5 0.5 <500 - 1,100
150 151 1 <500
154 155 1 <500 - 560
156.5 157 0.5 <500
RK-24-180 310 -70 366 102.3 No Significant Intersections
RK-24-181 310 -70 573 115.7 191.5 192 0.5 <500
RK-24-182 310 -70 411 N/A No Significant Intersections
RK-24-183 310 -70 501 125.3 347.5 350 2.5 500 - 52,000
350 351 1 <500 - 1,200
351 354 3 700 - 16,200
354 355 1 <500 - 570
355 358 3 1,300 - >61,000
358 358.5 0.5 790 - 2,100
358.5 362.5 4 <500 - 680
362.5 363 0.5 <500 - 1,070
363 365 2 <500
365 365.5 0.5 800 - 7,700
365.5 367 1.5 <500
367 367.5 0.5 <500 - 28,000
RK-24-184 280 -70 534 137.7 No Significant Intersections
RK-24-185 310 -70 396 N/A 312.5 313.5 1 <500
335 335.5 0.5 <500
RK-24-186 310 -70 440 128.2 181.5 182 0.5 <500 - 700
211 212 1 <500 - 600
RK-24-187 310 -70 501 116.8 163 164.5 1.5 <500
191 191.5 0.5 <500 - 830
RK-24-188 310 -70 510 120.5 338 340 2 <500
410.5 412.5 2 <500
418.5 421.5 3 <500
RK-24-189 310 -70 537 130 No Significant Intersections
RK-24-190 310 -70 547 123.8 No Significant Intersections
RK-24-191 310 -70 402 N/A 266 267 1 <500 - 700
RK-24-192 310 -70 444 108.5 No Significant Intersections
RK-24-193 310 -70 621 N/A 383.5 384.5 1 <500 - 820
389.5 390 0.5 <500 - 1,330
393.5 394 0.5 <500
401.5 402.5 1 580 - 640
413 413.5 0.5 <500
417.5 418.5 1 <500
419 420.5 1.5 <500 - 7,500
423 425 2 <500 - 700
426.5 428 1.5 <500 - 1,100
428.5 429 0.5 <500
430 430.5 0.5 <500 - 3,100
432 434 2 <500 - 2,850
435 437 2 <500
442 443 1 <500 - 510
449 451 2 <500 - 2,700
RK-24-194 310 -70 420 98.8 190.5 191 0.5 <500
• All depths and intervals are meters downhole, true thicknesses are yet to be determined.
• “Off-scale” refers to >61,000 cps total readings by gamma spectrometer type RS-125.
• Unconformity of ‘N/A’ denotes a lack of visible contact between Athabasca sandstone and basement rock.
• Maximum internal dilution 2.0 m downhole.
• Minimum thickness of 0.5 m downhole.
• All depths and intervals are metres downhole, true thicknesses are yet to be determined. Resource modelling
in conjunction with an updated mineral resource estimate is required before true thicknesses can be
determined.
Table 2: 2024 Assay results to date
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-24-179 310 -70 462 138 No Significant Intersections
RK-24-180 310 -70 366 102.3 No Significant Intersections
RK-24-181 310 -70 573 115.7 No Significant Intersections
RK-24-182 310 -70 411 N/A No Significant Intersections
RK-24-183 310 -70 501 125.3 347.5 361 13.5 0.78
including 348 348.5 0.5 10.0
including 356.5 357 0.5 6.23
362.5 363 0.5 0.07
365 365.5 0.5 0.55
367 367.5 0.5 1.42
369.5 370 0.5 0.01
RK-24-184 280 -70 534 137.7 No Significant Intersections
RK-24-185 310 -70 396 N/A 312.5 313.5 1 0.01
335 335.5 0.5 0.05
RK-24-186 310 -70 440 128.2 No Significant Intersections
RK-24-187 310 -70 501 116.8 No Significant Intersections
RK-24-188 310 -70 510 120.5 412 412.5 0.5 0.02
418.5 419 0.5 0.01
419.5 420 0.5 0.01
422.5 424 1.5 0.01
RK-24-189 310 -70 537 130 No Significant Intersections
RK-24-190 310 -70 547 123.8 No Significant Intersections
RK-24-191 310 -70 402 N/A No Significant Intersections
RK-24-192 310 -70 444 108.5 No Significant Intersections
RK-24-193 310 -70 621 N/A Assays Pending
RK-24-194 310 -70 420 98.8 No Significant Intersections
• 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.
About NexGen
NexGen Energy is a Canadian company focused on delivering clean energy fuel for the future. The
Company’s flagship Rook I Project is being optimally developed into the largest low cost producing uranium
mine globally, incorporating the most elite standards in environmental and social governance. The Rook I
Project is supported by a NI 43 -101 compliant Feasibility Study which outlines the elite environmental
performance and industry leading economics. NexGen is led by a team of experienced uranium and mining
industry professionals with expertise across the entire mining life cycle, including exploration, financing,
project engineering and construction, operations, and closure. NexGen is leveraging its proven experience
to deliver a Project that leads the ent ire 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 sol ving 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
www.nexgenenergy.ca
Travis McPherson
Chief Commercial Officer
NexGen Energy Ltd.
+1 604 428 4112
www.nexgenenergy.ca
Monica Kras
Vice President, Corporate Development
+44 7307 191933
www.nexgenenergy.ca
Technical Disclosure*
All technical information in this news release has been reviewed and approved by Jason Craven, NexGen's
Manager, Exploration, a qualified person under National Instrument 43-101.
Natural gamma radiation in drill core reported in this news release was measured in counts per second
(cps) using a Radiation Solutions Inc. RS-125 gamma spectrometer. The reader is cautioned that total count
gamma readings may not be directly or uniformly related to uranium grades of the rock sample measured;
they should be used only as a preliminary indication of the presence of radioactive minerals.
A technical report in respect of the FS is filed on SEDAR ( www.sedar.com ) and EDGAR
(www.sec.gov/edgar.shtml ) and is available for review on NexGen Energy's website
(www.nexgenenergy.ca ).
Cautionary Note to U.S. Investors
This news release includes Mineral Reserves and Mineral Resources classification terms that comply with
reporting standards in Canada and the Mineral Reserves and the Mineral Resources estimates are made in
accordance with NI 43-101. NI 43-101 is a rule de veloped 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 t hat 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