NexGen Announces Best Ever Discovery-Phase Intercept At Rook I Property

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RK-25-232 intersects broad zone of intense mineralization including 3.9 m of >61,000 cps
High-grade subdomain doubles in size to 210 m strike and 335 m vertical extent
Represents best hole drilled at any NexGen property, including Arrow, during the discovery-phase of exploration

VANCOUVER, BC, March 24, 2025 /PRNewswire/ - NexGen Energy Ltd. ("NexGen" or the "Company") (TSX: NXE) (NYSE: NXE) (ASX: NXG) is excited to announce the best hole drilled to date, RK-25-232 (Figures 1 and 2). This hole has materially expanded the shallow inner high-grade subdomain at Patterson Corridor East (PCE).

Drillhole RK-25-232 intersected 3.9 meters ("m") of >61,000 cps, indicating rich uranium concentration within a larger 13.8 m mineralized interval that starts at 452.2 m (Figures 3 and 4, Table 1). It is one of the shallowest high-grade intersections at PCE and open in all directions (including 300 m up dip) within the competent basement rock. Four additional winter drillholes all located a minimum 50 m from RK-25-232 have all encountered high-grade intercepts containing >61,000 cps (RK-25-227, -230, -233, -236) expanding the high-grade subdomain to 210 m along strike and 335 m of vertical extent, doubling in size since last reported in November 2024 (previously 100 m strike and 170 m vertical extent). Ongoing exploration will focus on growing and defining this high-grade zone from hole RK-25-232.

Leigh Curyer, Chief Executive Officer, commented: "This intercept from RK-25-232 is geologically exceptional and represents a transformational moment taking PCE into a category to rival Arrow at the same stage of drilling. Discovering mineralization of this intensity so early in our 2025 program outpaces the success pattern experienced at the Arrow Deposit. Incredible, considering Arrow's status on the world stage. To put this into context, the width of high-grade intense mineralization in RK-25-232 at PCE was first encountered at Arrow well into the delineation phase of resource definition. Together with Arrow, it's validation a very significant regional mineralizing event has occurred at Rook I that we are only just beginning to assess the magnitude.

Today's result comes at a time the need for Canada to optimize the development of its energy fuel resources has never been more important. NexGen, Saskatchewan and our community partners are ready to immediately commence construction of the Rook I Project subject to the completion of the CNSC approval process."

Jason Craven, Vice President, Exploration, commented: "Another exciting evaluation milestone has been achieved by intersecting the surge of mineralization intensity in RK-25-232. Vein-type uranium is known to have high-grade zones within broad, structurally controlled footprints. Our focus is to expand the high-grade subdomain while also investigating for natural repetition within the evolving mineralized footprint, all of which is very similar to the approach to Arrow's resource development."

The development of PCE has advanced quickly over the past year; from an initial discovery of new vein-type basement-hosted uranium in February 2024, to a rapidly growing mineralized footprint and expanding high-grade, and now to a best-ever high-grade intersection in RK-25-232. An interpreted 3D model (Figures 1 and 2) provides a new visual representation of the scale and setting of the mineralization.

Reporting of assays from 2024 is expected in April once all results have been received and verified.

Table 1: 2025 Spectrometer results as of March 13

Drillhole				Unconformity Depth (m)	Handheld Spectrometer Results (RS-125)
Hole ID	Azimuth	Dip	Total Depth (m)	Unconformity Depth (m)	From (m)	To (m)	Width (m)	CPS Range
RK-25-225	330	-70	684.0	108.6	475.00	475.5	0.5
					479.5	480.0	0.5
					482.0	482.5	0.5
					482.5	483.0	0.5
					483.5	484.0	0.5
					484.0	484.5	0.5
					484.5	485.0	0.5
					498.5	499.0	0.5
					499.0	499.5	0.5
					509.0	509.5	0.5
					509.5	510.0	0.5
					510.5	511.0	0.5
					511.0	511.5	0.5
					517.5	518.0	0.5
					523.0	523.5	0.5
					523.5	524.0	0.5
					526.5	527.0	0.5
					539.0	539.5	0.5
					539.5	540.0	0.5
					540.0	540.5	0.5
					541.0	541.5	0.5
					541.5	542.0	0.5
RK-25-226	330	-70	655.5	N/A	539.0	539.5	0.5
					540.5	541.0	0.5
					578.5	579.0	0.5
					579.5	580.0	0.5
					580.0	580.5	0.5
					580.5	581.0	0.5
					582.0	582.5	0.5
					583.0	583.5	0.5
					583.5	584.0	0.5
					584.0	584.5	0.5
					586.5	587.0	0.5
					587.0	587.5	0.5
					589.0	589.5	0.5
					589.5	590.0	0.5
					590.0	590.5	0.5
					590.5	591.0	0.5
					591.0	591.5	0.5
					591.5	592.0	0.5
					592.0	592.5	0.5
					592.5	593.0	0.5
					593.0	593.5	0.5
					594.0	594.5	0.5
					594.5	595.0	0.5
					595.0	595.5	0.5	1000 - 5400
					595.5	596.0	0.5
					596.0	596.5	0.5
					597.5	598.0	0.5
					598.0	598.5	0.5
					598.5	599.0	0.5
					599.0	599.5	0.5
					599.5	600.0	0.5
					600.0	600.5	0.5
					602.0	602.5	0.5
					606.0	606.5	0.5
RK-25-227	330	-70	657.0	113.4	493.0	493.5	0.5
					496.0	496.5	0.5
					496.5	497.0	0.5
					497.5	498.0	0.5
					498.0	498.5	0.5
					505.5	506.0	0.5
					506.0	506.5	0.5
					506.5	507.0	0.5
					507.0	507.5	0.5
					507.5	508.0	0.5
					508.0	508.5	0.5
					508.5	509.0	0.5
					509.0	509.5	0.5
					509.5	510.0	0.5
					510.5	511.0	0.5
					511.0	511.5	0.5
					511.5	512.0	0.5
					512.5	513.0	0.5
					513.5	514.0	0.5
					514.0	514.5	0.5
					514.5	515.0	0.5
					515.0	515.5	0.5
					515.5	516.0	0.5
					516.0	516.5	0.5	800 - 2000
					516.5	517.0	0.5	600 - 2000
					517.0	517.5	0.5	700 - 3000
					517.5	518.0	0.5	1200 - 5700
					518.0	518.5	0.5	1500 - 4500
					518.5	519.0	0.5	1000 - 4500
					519.0	519.5	0.5
					519.5	520.0	0.5
					520.0	520.5	0.5	1000 - 14000
					520.5	521.0	0.5	500 - 1300
					521.0	521.5	0.5	1000 - 3000
					521.5	522.0	0.5	800 - 3000
					522.0	522.5	0.5	1500 - 5000
					522.5	523.0	0.5
					523.0	523.5	0.5
					523.5	524.0	0.5
					524.0	524.5	0.5
					533.0	533.5	0.5
					533.5	534.0	0.5
					534.0	534.5	0.5	1200 - 1200
					534.5	535.0	0.5	700 - 950
					535.0	535.5	0.5	950- 1600
					535.5	536.0	0.5	1200 - 4200
					536.0	536.5	0.5	1200 - 6100
					536.5	537.0	0.5	600 - 1600
					537.0	537.5	0.5	3000 - 14000
					537.5	538.0	0.5	>61000
					538.0	538.1	0.1	45000 - 55000
					538.1	538.5	0.4	>61000
					538.5	539.0	0.5	850 - 6500
					539.0	539.1	0.1	900 - 1200
					539.1	539.2	0.1	25000 - 55000
					539.2	539.5	0.3	20000 - 37000
					539.5	539.6	0.1	>61000
					539.6	539.7	0.1	25000 - 55000
					539.7	540.0	0.3	>61000
					540.0	540.5	0.5	1700 - 6500
					540.5	541.0	0.5	800- 1400
					541.0	541.5	0.5
					541.5	542.0	0.5
					542.0	542.5	0.5
					542.5	543.0	0.5
					543.0	543.5	0.5
					544.0	544.5	0.5	600 - 3800
					544.5	545.0	0.5
					545.0	545.5	0.5
					552.0	552.5	0.5
					552.5	553.0	0.5
					553.0	553.5	0.5
					562.0	562.5	0.5
					562.5	563.0	0.5
					563.0	563.5	0.5
					563.5	564.0	0.5
RK-25-228	330	-75	609.0	117.1	493.0	493.5	0.5
					494.5	495.0	0.5
					495.5	496.0	0.5
					508.0	508.5	0.5
					537.5	538.0	0.5
					545.5	546.0	0.5
					561.5	562.0	0.5
					562.0	562.5	0.5
RK-25-229	350	-70	681.4	113.2	570.0	570.5	0.5
					570.5	571.0	0.5
					571.0	571.5	0.5
					573.5	574.0	0.5
					576.5	577.0	0.5
					578.0	578.5	0.5
					578.5	579.0	0.5
					582.0	582.5	0.5
					606.5	607.0	0.5
					607.0	607.5	0.5
					607.5	608.0	0.5
					622.5	623.0	0.5
					623.0	623.5	0.5
					633.5	634.0	0.5
					636.5	637.0	0.5
RK-25-230	330	-70	598.0	112.5	441.5	442.0	0.5
					442.0	442.5	0.5
					442.5	443.0	0.5
					443.0	443.5	0.5
					446.5	447.0	0.5
					447.0	447.5	0.5
					447.5	448.0	0.5
					448.0	448.5	0.5
					448.5	449.0	0.5
					475.0	475.5	0.5
					475.5	476.0	0.5
					476.0	476.5	0.5
					476.5	477.0	0.5
					477.0	477.5	0.5
					477.5	478.0	0.5
					478.0	478.5	0.5
					479.0	479.5	0.5
					479.5	480.0	0.5
					480.0	480.5	0.5
					480.5	481.0	0.5
					481.0	481.5	0.5
					481.5	482.0	0.5
					482.0	482.5	0.5
					482.5	483.0	0.5
					483.0	483.5	0.5
					483.5	484.0	0.5
					484.0	484.5	0.5
					484.5	485.0	0.5
					485.0	485.5	0.5
					485.5	486.0	0.5	680 - 3400
					486.0	486.5	0.5	540 - 2500
					486.5	487.0	0.5
					487.0	487.5	0.5
					487.5	488.0	0.5	740 - 7800
					488.0	488.5	0.5
					488.5	489.0	0.5
					489.0	489.5	0.5	730 - 1900
					489.5	490.0	0.5	820 - 7550
					490.0	490.5	0.5
					490.5	491.0	0.5
					491.0	491.5	0.5
					491.5	492.0	0.5
					492.0	492.5	0.5
					492.5	493.0	0.5
					493.0	493.2	0.2	>61000
					493.2	493.4	0.2	8000 - 28000
					493.4	493.5	0.1	>61000
					493.5	494.0	0.5
					494.0	494.5	0.5
					494.5	495.0	0.5
					495.0	495.5	0.5	2200 - 2200
					495.5	496.0	0.5
					496.0	496.5	0.5
					496.5	497.0	0.5	1400 - 2600
					497.0	497.5	0.5
					497.5	497.7	0.2	540 - 1100
					497.7	498.0	0.3	>61000
					498.0	498.5	0.5	1200 - 44000
					498.5	498.7	0.2	>61000
					498.7	499.0	0.3	5200 - 24000
					499.0	499.5	0.5	540 - 8000
					499.5	500.0	0.5
RK-25-231	329	-69.5	885.0	102.7	677.0	677.5	0.5
					683.0	683.5	0.5
					683.5	684.0	0.5
					684.0	684.5	0.5	580 - 1000
					685.0	685.5	0.5
					686.0	686.5	0.5
					686.5	687.0	0.5
					687.0	687.5	0.5
					687.5	688.0	0.5
					688.0	688.5	0.5
					689.0	689.5	0.5
					689.5	690.0	0.5
					690.0	690.5	0.5
					692.5	693.0	0.5
					693.0	693.5	0.5
					693.5	694.0	0.5	700 - 8100
					694.0	694.5	0.5	4200 - 31000
					694.5	695.0	0.5
					695.0	695.5	0.5	2000 - 21000
					695.5	696.0	0.5	2000 - 17000
					696.0	696.5	0.5	1200 - 16000
					696.5	697.0	0.5	1500 - 6600
					697.0	697.5	0.5	600 - 20000
					697.5	698.0	0.5	3100 - 11000
					698.0	698.5	0.5	3400 - 20000
					698.5	699.0	0.5	3700 - 12000
					699.0	699.5	0.5	620 - 2400
					699.5	700.0	0.5
					701.5	702.0	0.5
					704.0	704.5	0.5
					706.5	707.0	0.5
					707.0	707.5	0.5
					707.5	708.0	0.5
					708.0	708.5	0.5
					708.5	709.0	0.5	700 - 16000
					709.0	709.5	0.5
					709.5	710.5	1.0
					711.5	712.5	1.0
					713.0	714.0	0.5
					716.0	716.5	0.5
					716.5	717.0	0.5
					725.5	726.0	0.5
					729.5	730.0	0.5
					731.5	732.0	0.5
					732.0	732.5	0.5
					734.0	734.5	0.5
					737.0	737.5	0.5
RK-25-232	330	-70	501.0	112.5	395.0	395.5	0.5
					408.0	408.5	0.5
					408.5	409.0	0.5
					409.5	410.0	0.5
					411.5	412.0	0.5
					411.5	412.0	0.5
					424.5	425.0	0.5
					426.5	428.0	1.5
					435.5	438.0	2.5
					444.5	445.5	1.0
					449.5	450.0	0.5
					450.5	451.0	0.5
					452.0	452.5	0.5
					452.5	453.0	0.5	3200 - 9700
					453.0	453.5	0.5	3100 - 7500
					453.5	454.0	0.5	900 - 2500
					454.5	455.0	0.5	700 - 2300
					455.0	455.5	0.5	8300 - 24000
					455.5	456.0	0.5	1100 - 2200
					456.0	456.5	0.5	1100 - 4800
					456.5	457.0	0.5	4400 - 10000
					457.0	457.5	0.5	1100 - 17000
					457.5	457.8	0.3	24000 - 54000
					457.8	458.0	0.2	>61000
					458.0	458.1	0.1	32000 - 45000
					458.1	460.3	2.2	>61000
					460.3	460.5	0.2	1500 - 3400
					460.5	460.6	0.1	16000 - 54000
					460.6	461.3	0.7	>61000
					461.3	461.5	0.2	2500 - 20000
					461.5	462.0	0.5	600 -1200
					462.0	462.5	0.5	600 - 2700
					462.5	463.0	0.5	1200 - 1400
					463.0	463.5	0.5	6600 - 34000
					463.5	463.6	0.1	16000 - 25000
					463.6	463.8	0.2	1200 - 2200
					463.8	464.1	0.3	>61000
					464.1	464.3	0.2	25000 - 45000
					464.3	464.8	0.5	>61000
					464.8	465.0	0.2	900 - 1200
					465.0	465.3	0.3	1500 - 2500
					465.3	465.5	0.2	14000 - 45000
					465.5	466.0	0.5
					466.0	466.5	0.5
					466.5	467.0	0.5
					467.0	467.5	0.5
					467.5	468.0	0.5
					468.0	468.5	0.5
					468.5	469.0	0.5
					469.0	469.5	0.5
					469.5	470.0	0.5
					470.0	470.5	0.5
					470.5	471.0	0.5
					471.0	471.5	0.5
					471.5	472.0	0.5
					472.5	473.0	0.5
					480.0	480.5	0.5
					481.5	482.0	0.5
					482.0	482.5	0.5
					482.5	483.0	0.5
					483.5	484.0	0.5
					484.0	484.5	0.5
					484.5	485.0	0.5	1100 - 1100
					485.0	485.5	0.5
					485.5	486.0	0.5
					486.0	486.5	0.5
					486.5	487.0	0.5
					491.0	491.5	0.5
					491.5	492.0	0.5
					495.5	496.0	0.5
					496.0	496.5	0.5
					496.5	497.0	0.5
					499.0	499.5	0.5
					499.5	500.0	0.5
					500.0	500.5	0.5
					500.5	501.0	0.5
					502.0	502.5	0.5
					502.5	503.0	0.5	900 - 900
					503.0	503.5	0.5
					505.0	505.5	0.5
					509.5	510.0	0.5
					510.0	510.5	0.5
					515.5	516.0	0.5
					516.0	516.5	0.5
RK-25-233	330	-70	694.0	109.7	561.0	561.5	0.5
					561.5	562.0	0.5
					562.0	563.5	1.5
					563.5	564.0	0.5
					564.0	565.0	1.0
					565.0	565.5	0.5
					565.5	566.0	0.5
					566.0	566.5	0.5
					566.5	567.0	0.5
					567.0	567.5	0.5
					567.5	569.5	2.0
					570.0	571.0	1.0
					571.0	571.5	0.5
					571.5	572.0	0.5
					575.0	575.5	0.5
					576.0	576.5	0.5
					576.5	577.0	0.5
					577.0	577.5	0.5	600 - 1200
					577.5	578.0	0.5
					578.0	578.4	0.4	1000 - 8500
					578.4	578.8	0.4	>61000
					578.8	579.0	0.2	600 - 1000
					579.0	579.5	0.5	2500 - 11000
					579.5	580.0	0.5	2000 - 8000
					580.0	580.5	0.5	800 - 15000
					580.5	581.0	0.5	500 - 650
					581.0	581.5	0.5
					581.5	582.0	0.5
					582.5	584.0	1.5
					584.0	584.5	0.5
					584.5	585.0	0.5	1000 - 4300
					585.0	585.5	0.5	2000 - 7000
					585.5	586.0	0.5	1500 - 8500
					586.0	586.5	0.5	2000 - 6000
					586.5	587.0	0.5	20000 - 45000
					587.0	587.5	0.5	20000 - 40000
					587.5	588.0	0.5	1000 - 17000
					588.0	588.5	0.5	500 - 1200
					588.5	589.0	0.5
					589.0	589.5	0.5	700 - 2400
					589.5	591.0	1.5
					591.0	591.5	0.5
					591.5	592.5	1.0
					592.5	593.0	0.5
					593.0	593.5	0.5
					593.5	594.0	0.5
					594.0	594.5	0.5
					594.5	595.0	0.5	1200 - 2400
					595.0	595.5	0.5	500 - 700
					603.0	603.5	0.5
					603.5	604.0	0.5
					604.0	604.5	0.5	10000 - 30000
					604.5	605.0	0.5	6000 - 13000
					605.0	605.5	0.5	700 - 1000
					605.5	606.0	0.5	500 - 1300
					606.0	606.5	0.5	500 - 1400
					606.5	607.0	0.5
					607.0	607.5	0.5	500 - 1500
					607.5	608.0	0.5
					608.0	609.0	1.0
					609.0	609.5	0.5
					624.5	625.0	0.5
					625.0	625.5	0.5
					625.5	626.0	0.5
					629.5	630.0	0.5
					630.0	630.5	0.5
					633.5	634.0	0.5
					634.0	634.5	0.5
					634.5	635.0	0.5
					635.0	635.5	0.5
					635.5	636.0	0.5	2500 - 5000
RK-25-234	330	-70	747.0	113.0	668.0	668.5	0.5
					672.0	672.5	0.5
					672.5	673.0	0.5
					675.0	675.5	0.5
					675.5	676.0	0.5
					677.0	677.5	0.5
					677.5	678.0	0.5
					679.5	680.0	0.5
					682.0	682.5	0.5
					685.0	685.5	0.5
					687.0	687.5	0.5
					687.5	687.7	0.2	2000 - 14000
					687.7	687.8	0.1	>61000
					687.8	688.0	0.2	550 - 3300
					688.0	688.5	0.5
RK-25-235	270	-70	TBD	105.5	In Progress
RK-25-236	267	-65	541.0	129.0	377.5	379.0	1.5
					379.0	379.5	0.5
					379.5	380.0	0.5
					380.0	380.5	0.5
					380.5	381.0	0.5	870 - 3400
					381.0	381.5	0.5	1300 - 4400
					381.5	382.0	0.5
					382.0	382.5	0.5
					393.0	394.0	1.0
					395.0	396.0	1.0
					396.0	396.5	0.5
					396.5	397.0	0.5	600 - 1050
					397.0	397.5	0.5	550 - 1180
					400.5	401.0	0.5
					401.0	401.5	0.5	560 - 980
					401.5	402.0	0.5	2300 - 25000
					402.0	402.5	0.5	850 - 1130
					402.5	403.0	0.5
					404.0	404.5	0.5
					411.0	414.0	3.0
					414.5	415.0	0.5
					427.5	428.0	0.5
					428.0	428.5	0.5
					457.5	458.0	0.5
					458.0	458.5	0.5
					458.5	459.0	0.5
					459.0	459.5	0.5
					459.5	460.0	0.5
					460.0	460.5	0.5
					461.5	462.0	0.5
					464.0	465.0	1.0
					465.0	465.5	0.5
					465.5	466.0	0.5
					466.0	466.5	0.5	900 - 11000
					466.5	467.0	0.5	1000 - 5500
					467.0	467.5	0.5	3000 - 16000
					467.5	467.8	0.3	1300 - 57000
					467.8	468.1	0.3	>61000
					468.1	468.5	0.4	7000 - 40000
					468.5	469.0	0.5	1500 - 9000
					469.0	469.5	0.5	2000 - 11000
					469.5	470.0	0.5	500 - 800
					470.0	470.5	0.5
					475.5	477.5	2.0
					477.5	478.0	0.5
					478.0	478.5	0.5
					478.5	479.0	0.5
					516.5	517.0	0.5
RK-25-237	340	-70	TBD	104.6	In progress
RK-25-238	279	-67	TBD	TBD	In progress

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.
"Anomalous" means >500 cps (counts per second) total count gamma readings by gamma scintillometer type RS-120.
Where "CPS Range" is
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 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 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.

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.sedar.com ) and EDGAR (www.sec.gov/edgar.shtml ) and is available for review on NexGen Energy's website (www.nexgenenergy.ca ).

Cautionary Note to U.S. Investors

This news release includes Mineral Reserves and Mineral Resources classification terms that comply with reporting standards in Canada and the Mineral Reserves and the Mineral Resources estimates are made in accordance with NI 43-101. NI 43-101 is a rule developed by the Canadian Securities Administrators that establishes standards for all public disclosure an issuer makes of scientific and technical information concerning mineral projects. These standards differ from the requirements of the Securities and Exchange Commission ("SEC") set by the SEC's rules that are applicable to domestic United States reporting companies. Consequently, Mineral Reserves and Mineral Resources information included in this news release is not comparable to similar information that would generally be disclosed by domestic U.S. reporting companies subject to the reporting and disclosure requirements of the SEC Accordingly, information concerning mineral deposits set forth herein may not be comparable with information made public by companies that report in accordance with U.S. standards.

Forward-Looking Information

The information contained herein contains "forward-looking statements" within the meaning of applicable United States securities laws and regulations and "forward-looking information" within the meaning of applicable Canadian securities legislation. "Forward-looking information" includes, but is not limited to, statements with respect to mineral reserve and mineral resource estimates, the 2021 Arrow Deposit, Rook I Project and estimates of uranium production, grade and long-term average uranium prices, anticipated effects of completed drill results on the Rook I Project, planned work programs, completion of further site investigations and engineering work to support basic engineering of the project and expected outcomes. Generally, but not always, forward-looking information and statements can be identified by the use of words such as "plans", "expects", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates", or "believes" or the negative connotation thereof or variations of such words and phrases or state that certain actions, events or results "may", "could", "would", "might" or "will be taken", "occur" or "be achieved" or the negative connotation thereof. Statements relating to "mineral resources" are deemed to be forward-looking information, as they involve the implied assessment that, based on certain estimates and assumptions, the mineral resources described can be profitably produced in the future.

Forward-looking information and statements are based on the then current expectations, beliefs, assumptions, estimates and forecasts about NexGen's business and the industry and markets in which it operates. Forward-looking information and statements are made based upon numerous assumptions, including among others, that the mineral reserve and resources estimates and the key assumptions and parameters on which such estimates are based are as set out in this news release and the technical report for the property , the results of planned exploration activities are as anticipated, the price and market supply of uranium, the cost of planned exploration activities, that financing will be available if and when needed and on reasonable terms, that third party contractors, equipment, supplies and governmental and other approvals required to conduct NexGen's planned exploration activities will be available on reasonable terms and in a timely manner and that general business and economic conditions will not change in a material adverse manner. Although the assumptions made by the Company in providing forward looking information or making forward looking statements are considered reasonable by management at the time, there can be no assurance that such assumptions will prove to be accurate in the future.

Forward-looking information and statements also involve known and unknown risks and uncertainties and other factors, which may cause actual results, performances and achievements of NexGen to differ materially from any projections of results, performances and achievements of NexGen expressed or implied by such forward-looking information or statements, including, among others, the existence of negative operating cash flow and dependence on third party financing, uncertainty of the availability of additional financing, the risk that pending assay results will not confirm previously announced preliminary results, conclusions of economic valuations, the risk that actual results of exploration activities will be different than anticipated, the cost of labour, equipment or materials will increase more than expected, that the future price of uranium will decline or otherwise not rise to an economic level, the appeal of alternate sources of energy to uranium-produced energy, that the Canadian dollar will strengthen against the U.S. dollar, that mineral resources and reserves are not as estimated, that actual costs or actual results of reclamation activities are greater than expected, that changes in project parameters and plans continue to be refined and may result in increased costs, of unexpected variations in mineral resources and reserves, grade or recovery rates or other risks generally associated with mining, unanticipated delays in obtaining governmental, regulatory or First Nations approvals, risks related to First Nations title and consultation, reliance upon key management and other personnel, deficiencies in the Company's title to its properties, uninsurable risks, failure to manage conflicts of interest, failure to obtain or maintain required permits and licences, risks related to changes in laws, regulations, policy and public perception, as well as those factors or other risks as more fully described in NexGen's Annual Information Form dated March 6, 2024 filed with the securities commissions of all of the provinces of Canada except Quebec and in NexGen's 40-F filed with the United States Securities and Exchange Commission, which are available on SEDAR at www.sedar.com and Edgar at www.sec.gov .

Although the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in the forward-looking information or statements or implied by forward-looking information or statements, there may be other factors that cause results not to be as anticipated, estimated or intended. Readers are cautioned not to place undue reliance on forward-looking information or statements due to the inherent uncertainty thereof.

There can be no assurance that forward-looking information and statements will prove to be accurate, as actual results and future events could differ materially from those anticipated, estimated or intended. Accordingly, readers should not place undue reliance on forward-looking statements or information. The Company undertakes no obligation to update or reissue forward-looking information as a result of new information or events except as required by applicable securities laws.

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SOURCE NexGen Energy Ltd.

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