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

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NexGen Energy (TSX: NXE) has announced a significant discovery at its Rook I property, with drillhole RK-25-232 delivering the best-ever discovery-phase intercept. The hole intersected 3.9 meters of >61,000 cps uranium mineralization within a larger 13.8m mineralized interval starting at 452.2m depth.

The high-grade subdomain at Patterson Corridor East (PCE) has doubled in size since November 2024, now extending 210m along strike and 335m of vertical extent. Four additional winter drillholes (RK-25-227, -230, -233, -236) have all encountered high-grade intercepts, with mineralization remaining open in all directions, including 300m up dip within the basement rock.

This discovery represents a transformational moment for PCE, potentially rivaling NexGen's Arrow Deposit at the same development stage. The company plans to focus ongoing exploration on expanding this high-grade zone from hole RK-25-232.

NexGen Energy (TSX: NXE) ha annunciato una scoperta significativa presso la sua proprietà Rook I, con il foro di perforazione RK-25-232 che ha fornito il miglior intercetto mai registrato nella fase di scoperta. Il foro ha intercettato 3,9 metri di mineralizzazione di uranio con oltre 61.000 cps all'interno di un intervallo mineralizzato più ampio di 13,8m che inizia a una profondità di 452,2m.

Il sottodominio ad alta qualità presso Patterson Corridor East (PCE) è raddoppiato in dimensioni dal novembre 2024, estendendosi ora 210m lungo la direzione di strike e 335m di estensione verticale. Quattro ulteriori fori di perforazione invernali (RK-25-227, -230, -233, -236) hanno tutti incontrato intercetti ad alta qualità, con la mineralizzazione che rimane aperta in tutte le direzioni, inclusi 300m in su nel basamento roccioso.

Questa scoperta rappresenta un momento trasformativo per PCE, potenzialmente in grado di rivaleggiare con il Deposito Arrow di NexGen nella stessa fase di sviluppo. L'azienda prevede di concentrare l'esplorazione in corso sull'espansione di questa zona ad alta qualità a partire dal foro RK-25-232.

NexGen Energy (TSX: NXE) ha anunciado un descubrimiento significativo en su propiedad Rook I, con el agujero de perforación RK-25-232 que proporciona el mejor intercepto jamás registrado en la fase de descubrimiento. El agujero intersectó 3.9 metros de mineralización de uranio con más de 61,000 cps dentro de un intervalo mineralizado más grande de 13.8m que comienza a una profundidad de 452.2m.

El subdominio de alta calidad en Patterson Corridor East (PCE) se ha duplicado en tamaño desde noviembre de 2024, extendiéndose ahora 210m a lo largo del strike y 335m de extensión vertical. Cuatro agujeros de perforación adicionales de invierno (RK-25-227, -230, -233, -236) han encontrado todos interceptos de alta calidad, con la mineralización permaneciendo abierta en todas las direcciones, incluyendo 300m hacia arriba en la roca de basamento.

Este descubrimiento representa un momento transformador para PCE, potencialmente rivalizando con el Depósito Arrow de NexGen en la misma etapa de desarrollo. La compañía planea enfocar la exploración en curso en la expansión de esta zona de alta calidad a partir del agujero RK-25-232.

NexGen Energy (TSX: NXE)는 Rook I 자산에서 중요한 발견을 발표했으며, 드릴홀 RK-25-232가 발견 단계에서 최고의 인터셉트를 기록했습니다. 이 구멍은 3.9미터의 61,000 cps 이상의 우라늄 광물화를 포함한 13.8m의 광물화 구간을 452.2m 깊이에서 교차했습니다.

Patterson Corridor East (PCE)에서의 고품질 서브도메인은 2024년 11월 이후 두 배로 커져 현재 210m의 스트라이크 방향과 335m의 수직 범위로 확장되었습니다. 추가적인 겨울 드릴홀 네 개(RK-25-227, -230, -233, -236) 모두 고품질 인터셉트를 발견했으며, 광물화는 모든 방향으로 열려 있으며, 기저암에서 300m 위쪽으로도 계속되고 있습니다.

이번 발견은 PCE에 있어 변혁적인 순간을 의미하며, NexGen의 Arrow Deposit과 같은 개발 단계에서 경쟁할 가능성이 있습니다. 회사는 RK-25-232 구멍에서 이 고품질 구역의 확장에 계속 집중할 계획입니다.

NexGen Energy (TSX: NXE) a annoncé une découverte significative sur sa propriété Rook I, avec le trou de forage RK-25-232 qui a fourni le meilleur intercept jamais enregistré lors de la phase de découverte. Le trou a intersecté 3,9 mètres de minéralisation d'uranium avec plus de 61 000 cps dans un intervalle minéralisé plus large de 13,8 m commençant à une profondeur de 452,2 m.

Le sous-domaine à haute teneur au Patterson Corridor East (PCE) a doublé de taille depuis novembre 2024, s'étendant maintenant sur 210 m le long du strike et 335 m de portée verticale. Quatre trous de forage supplémentaires d'hiver (RK-25-227, -230, -233, -236) ont tous rencontré des intercepts de haute qualité, la minéralisation restant ouverte dans toutes les directions, y compris 300 m en amont dans la roche de fond.

Cette découverte représente un moment transformateur pour le PCE, rivalisant potentiellement avec le dépôt Arrow de NexGen au même stade de développement. L'entreprise prévoit de concentrer l'exploration en cours sur l'expansion de cette zone à haute teneur à partir du trou RK-25-232.

NexGen Energy (TSX: NXE) hat eine bedeutende Entdeckung auf seinem Grundstück Rook I bekannt gegeben, wobei das Bohrloch RK-25-232 den besten jemals registrierten Entdeckungsinterzept lieferte. Das Loch durchbrach 3,9 Meter mit mehr als 61.000 cps Uranmineralisierung innerhalb eines größeren mineralisierten Intervalls von 13,8 m, das in einer Tiefe von 452,2 m beginnt.

Das hochgradige Subdomäne im Patterson Corridor East (PCE) hat sich seit November 2024 verdoppelt und erstreckt sich jetzt 210m entlang des Strike und 335m vertikal. Vier zusätzliche Winterbohrlöcher (RK-25-227, -230, -233, -236) haben alle hochgradige Interzepte gefunden, wobei die Mineralisierung in alle Richtungen offen bleibt, einschließlich 300m in die Höhe im Grundgestein.

Diese Entdeckung stellt einen transformativen Moment für PCE dar, der potenziell mit NexGens Arrow Deposit in der gleichen Entwicklungsphase konkurrieren kann. Das Unternehmen plant, die laufende Erkundung auf die Erweiterung dieser hochgradigen Zone vom Bohrloch RK-25-232 zu konzentrieren.

Positive
  • Best-ever discovery-phase drilling results with 3.9m of >61,000 cps uranium mineralization
  • High-grade subdomain doubled in size since November 2024
  • Four additional holes confirmed high-grade mineralization, indicating consistent results
  • Mineralization remains open in all directions, suggesting potential for further expansion
Negative
  • True thickness of mineralization yet to be determined
  • Resource modeling and updated mineral resource estimate still required

Insights

NexGen's latest drill results at Patterson Corridor East (PCE) represent a genuinely significant exploration breakthrough that dramatically changes the company's growth trajectory. Hole RK-25-232's intercept of 3.9 meters of off-scale mineralization (>61,000 cps) within a broader 13.8m mineralized zone is exceptional for discovery-phase drilling.

What makes this particularly valuable is the rapid expansion of the high-grade subdomain, which has doubled to 210m strike length and 335m vertical extent since November. The shallow depth (starting at 452.2m) and location within competent basement rock significantly enhances economic potential compared to deeper or more structurally complex deposits.

The comparison to Arrow is noteworthy - this level of mineralization intensity wasn't encountered at Arrow until well into resource definition, suggesting PCE could potentially rival or complement Arrow's world-class status. With the zone remaining open in all directions, including 300m up-dip, the resource growth potential appears substantial.

Four additional holes containing >61,000 cps readings at minimum 50m spacing further confirms this isn't an isolated occurrence but potentially a substantial new high-grade zone. This pattern of mineralization suggests a significant mineralizing event occurred across the Rook I property, raising the possibility of additional discoveries beyond Arrow and PCE.

NexGen's discovery at PCE comes at a strategically opportune moment for uranium developers. With growing recognition of nuclear energy's role in clean power generation and concerns about uranium supply security, high-grade discoveries in stable jurisdictions like Saskatchewan carry exceptional premium value.

The geological validation that a major mineralizing event occurred across the Rook I property substantially enhances NexGen's resource growth potential beyond existing estimates. This matters because the market values uranium developers not just on current resources but on exploration upside - which this discovery significantly expands.

Most crucially, the company explicitly states they're ready to "immediately commence construction" of the Rook I Project pending regulatory approval. This positions NexGen to potentially accelerate development timelines to capitalize on favorable uranium market conditions.

What sets this discovery apart is both quality and timing. The intensity of mineralization (>61,000 cps) at relatively shallow depths in stable basement rock suggests potential for low-cost extraction. Meanwhile, the doubling of the high-grade zone dimensions since November demonstrates exceptional exploration efficiency that could translate to resource growth at a fraction of typical discovery costs.

The parallels drawn to Arrow's early development suggest PCE could materially expand NexGen's production profile or mine life, potentially transforming what was already considered a tier-one uranium development project into something substantially larger.

  • 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.

Figure 1: Interpreted model of mineralization at PCE (as of this release) and same exploration stage of the A2 shear mineralization from Arrow (as of Spring 2015); both are shown on long sections that look perpendicular to their primary mineralized planes; total mineralized footprint in orange and the high-grade subdomains in red; 2019 Feasibility Study notes 174.2 Mlbs U3O8 measured and indicated hosted by final A2 (CNW Group/NexGen Energy Ltd.)

Figure 2: Zoomed view of RK-25-232 and surrounding pierce points on the long section, significant space to be tested in all directions (CNW Group/NexGen Energy Ltd.)

Figure 3: Core photo of mineralization from RK-25-232; off-scale high-grade mineralization is near continuous within an overall vein width of 13.8 m from 452.2 to 466.0 m; yellow outlines >1,000 cps, red outlines >10,000 cps, purple outlines >61,000 cps (CNW Group/NexGen Energy Ltd.)

Figure 4: Massive replacement by uranium mineralization at 460.6 m in RK-25-232; examples of this intense mineralization style are spread throughout the high-grade subdomain (CNW Group/NexGen Energy Ltd.)

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)

From
(m)

To (m)

Width
(m)

CPS Range

RK-25-225

330

-70

684.0

108.6

475.00

475.5

0.5

 <500






479.5

480.0

0.5

 <500 - 1400






482.0

482.5

0.5

 <500 - 850






482.5

483.0

0.5

 <500






483.5

484.0

0.5

 <500






484.0

484.5

0.5

 <500






484.5

485.0

0.5

 <500






498.5

499.0

0.5

 <500 - 650






499.0

499.5

0.5

 <500 - 830






509.0

509.5

0.5

 <500 - 1300






509.5

510.0

0.5

 <500






510.5

511.0

0.5

 <500 - 750






511.0

511.5

0.5

 <500 - 1800






517.5

518.0

0.5

 <500






523.0

523.5

0.5

 <500






523.5

524.0

0.5

 <500






526.5

527.0

0.5

 <500






539.0

539.5

0.5

 <500






539.5

540.0

0.5

 <500






540.0

540.5

0.5

 <500






541.0

541.5

0.5

 <500 - 1600






541.5

542.0

0.5

 <500

RK-25-226

330

-70

655.5

N/A

539.0

539.5

0.5

 <500






540.5

541.0

0.5

 <500 - 550






578.5

579.0

0.5

 <500






579.5

580.0

0.5

 <500






580.0

580.5

0.5

 <500 - 880






580.5

581.0

0.5

 <500 - 510






582.0

582.5

0.5

 <500






583.0

583.5

0.5

 <500






583.5

584.0

0.5

 <500 - 2200






584.0

584.5

0.5

 <500 - 980






586.5

587.0

0.5

 <500






587.0

587.5

0.5

 <500






589.0

589.5

0.5

 <500






589.5

590.0

0.5

 <500






590.0

590.5

0.5

 <500






590.5

591.0

0.5

 <500 - 730






591.0

591.5

0.5

 <500 - 720






591.5

592.0

0.5

 <500






592.0

592.5

0.5

 <500 - 1200






592.5

593.0

0.5

 <500 - 1280






593.0

593.5

0.5

 <500 - 1150






594.0

594.5

0.5

 <500 - 890






594.5

595.0

0.5

 <500






595.0

595.5

0.5

1000 - 5400






595.5

596.0

0.5

 <500






596.0

596.5

0.5

 <500






597.5

598.0

0.5

 <500






598.0

598.5

0.5

 <500 - 770






598.5

599.0

0.5

 <500 - 1600






599.0

599.5

0.5

 <500






599.5

600.0

0.5

 <500 - 510






600.0

600.5

0.5

 <500 - 710






602.0

602.5

0.5

 <500






606.0

606.5

0.5

 <500

RK-25-227

330

-70

657.0

113.4

493.0

493.5

0.5

 <500






496.0

496.5

0.5

 <500






496.5

497.0

0.5

 <500






497.5

498.0

0.5

 <500 - 950






498.0

498.5

0.5

 <500






505.5

506.0

0.5

 <500 - 650






506.0

506.5

0.5

 <500 - 2300






506.5

507.0

0.5

 <500 - 650






507.0

507.5

0.5

 <500 - 1500






507.5

508.0

0.5

 <500 - 1250






508.0

508.5

0.5

 <500






508.5

509.0

0.5

 <500 - 1400






509.0

509.5

0.5

 <500 - 2500






509.5

510.0

0.5

 <500






510.5

511.0

0.5

 <500






511.0

511.5

0.5

 <500






511.5

512.0

0.5

 <500






512.5

513.0

0.5

 <500






513.5

514.0

0.5

 <500






514.0

514.5

0.5

 <500






514.5

515.0

0.5

 <500






515.0

515.5

0.5

 <500 - 1600






515.5

516.0

0.5

 <500






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

 <500 - 1500






519.5

520.0

0.5

 <500 - 800






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

 <500 - 4000






523.0

523.5

0.5

 <500 - 600






523.5

524.0

0.5

 <500 - 900






524.0

524.5

0.5

 <500






533.0

533.5

0.5

 <500






533.5

534.0

0.5

 <500 - 1200






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

 <500 - 900






541.5

542.0

0.5

 <500






542.0

542.5

0.5

 <500 - 1200






542.5

543.0

0.5

 <500 - 1200






543.0

543.5

0.5

 <500 - 1600






544.0

544.5

0.5

600 - 3800






544.5

545.0

0.5

 <500 - 9400






545.0

545.5

0.5

 <500






552.0

552.5

0.5

 <500 - 1500






552.5

553.0

0.5

 <500 - 700






553.0

553.5

0.5

 <500






562.0

562.5

0.5

 <500






562.5

563.0

0.5

<500 - 600






563.0

563.5

0.5

 <500






563.5

564.0

0.5

 <500

RK-25-228

330

-75

609.0

117.1

493.0

493.5

0.5

 <500






494.5

495.0

0.5

 <500 - 800






495.5

496.0

0.5

 <500






508.0

508.5

0.5

 <500






537.5

538.0

0.5

 <500 - 700






545.5

546.0

0.5

 <500 - 3000






561.5

562.0

0.5

 <500






562.0

562.5

0.5

 <500

RK-25-229

350

-70

681.4

113.2

570.0

570.5

0.5

 <500






570.5

571.0

0.5

 <500






571.0

571.5

0.5

 <500






573.5

574.0

0.5

 <500






576.5

577.0

0.5

 <500






578.0

578.5

0.5

 <500






578.5

579.0

0.5

 <500 - 700






582.0

582.5

0.5

 <500 - 600






606.5

607.0

0.5

 <500 - 30000






607.0

607.5

0.5

 <500 - 19000






607.5

608.0

0.5

 <500 - 3400






622.5

623.0

0.5

 <500 - 2200






623.0

623.5

0.5

 <500 - 1400






633.5

634.0

0.5

 <500






636.5

637.0

0.5

 <500 - 3700

RK-25-230

330

-70

598.0

112.5

441.5

442.0

0.5

 <500- 6700






442.0

442.5

0.5

 <500 - 1800






442.5

443.0

0.5

 <500 - 640






443.0

443.5

0.5

 <500 - 640






446.5

447.0

0.5

 <500






447.0

447.5

0.5

 <500 - 720






447.5

448.0

0.5

 <500 - 1400






448.0

448.5

0.5

<500 - 1800






448.5

449.0

0.5

 <500 - 620






475.0

475.5

0.5

 <500






475.5

476.0

0.5

 <500 - 1700






476.0

476.5

0.5

 <500 - 1660






476.5

477.0

0.5

 <500 - 580






477.0

477.5

0.5

 <500 - 1050






477.5

478.0

0.5

 <500 - 540






478.0

478.5

0.5

 <500 - 1080






479.0

479.5

0.5

 <500 - 710






479.5

480.0

0.5

 <500






480.0

480.5

0.5

 <500






480.5

481.0

0.5

 <500






481.0

481.5

0.5

 <500 - 860






481.5

482.0

0.5

 <500 - 1820






482.0

482.5

0.5

 <500 - 1100






482.5

483.0

0.5

<500 - 2700






483.0

483.5

0.5

 <500 - 10000






483.5

484.0

0.5

 <500 - 520






484.0

484.5

0.5

 <500






484.5

485.0

0.5

 <500 - 1360






485.0

485.5

0.5

 <500 - 1350






485.5

486.0

0.5

680 - 3400






486.0

486.5

0.5

540 - 2500






486.5

487.0

0.5

 <500






487.0

487.5

0.5

 <500 - 4420






487.5

488.0

0.5

740 - 7800






488.0

488.5

0.5

 <500 - 8000






488.5

489.0

0.5

 <500 - 2300






489.0

489.5

0.5

730 - 1900






489.5

490.0

0.5

820 - 7550






490.0

490.5

0.5

 <500 - 1250






490.5

491.0

0.5

 <500






491.0

491.5

0.5

 <500






491.5

492.0

0.5

 <500






492.0

492.5

0.5

 <500






492.5

493.0

0.5

 <500 - 1140






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

 <500 - 31000






494.0

494.5

0.5

 <500 - 5100






494.5

495.0

0.5

 <500 - 1160






495.0

495.5

0.5

2200 - 2200






495.5

496.0

0.5

 <500 - 1650






496.0

496.5

0.5

 <500 - 3700






496.5

497.0

0.5

1400 - 2600






497.0

497.5

0.5

 <500 - 4500






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

 <500 - 680

RK-25-231

329

-69.5

885.0

102.7

677.0

677.5

0.5

 <500 - 920






683.0

683.5

0.5

 <500 -1200






683.5

684.0

0.5

 <500 - 1500






684.0

684.5

0.5

580 - 1000






685.0

685.5

0.5

 <500






686.0

686.5

0.5

 <500






686.5

687.0

0.5

 <500 - 4000






687.0

687.5

0.5

 <500






687.5

688.0

0.5

 <500 - 6700






688.0

688.5

0.5

 <500 - 20000






689.0

689.5

0.5

 <500 - 6000






689.5

690.0

0.5

 <500 - 1000






690.0

690.5

0.5

 <500 - 2200






692.5

693.0

0.5

 <500 - 3600






693.0

693.5

0.5

 <500 - 4800






693.5

694.0

0.5

700 - 8100






694.0

694.5

0.5

4200 - 31000






694.5

695.0

0.5

 <500 - 11000






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

 <500






701.5

702.0

0.5

 <500






704.0

704.5

0.5

 <500






706.5

707.0

0.5

 <500 - 16000






707.0

707.5

0.5

 <500 - 900






707.5

708.0

0.5

 <500 - 800






708.0

708.5

0.5

 <500 - 8000






708.5

709.0

0.5

700 - 16000






709.0

709.5

0.5

 <500 - 720






709.5

710.5

1.0

 <500






711.5

712.5

1.0

 <500






713.0

714.0

0.5

 <500






716.0

716.5

0.5

 <500 - 15000






716.5

717.0

0.5

 <500 - 2800






725.5

726.0

0.5

 <500 - 9500






729.5

730.0

0.5

 <500 - 1100






731.5

732.0

0.5

 <500-1300






732.0

732.5

0.5

 < 300 - 2300






734.0

734.5

0.5

 <500 - 2300






737.0

737.5

0.5

 <500

RK-25-232

330

-70

501.0

112.5

395.0

395.5

0.5

 <500 - 750






408.0

408.5

0.5

 <500






408.5

409.0

0.5

 <500 - 650






409.5

410.0

0.5

 <500 - 900






411.5

412.0

0.5

 <500 - 700






411.5

412.0

0.5

 <500 - 1100






424.5

425.0

0.5

 <500






426.5

428.0

1.5

 <500






435.5

438.0

2.5

 <500 - 660






444.5

445.5

1.0

 <500 - 500






449.5

450.0

0.5

 <500 - 650






450.5

451.0

0.5

 <500






452.0

452.5

0.5

 <500 - 1100






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

 <500 - 1100






466.0

466.5

0.5

 <500 - 800






466.5

467.0

0.5

 <500 - 5500






467.0

467.5

0.5

 <500






467.5

468.0

0.5

 <500 - 650






468.0

468.5

0.5

 <500






468.5

469.0

0.5

 <500






469.0

469.5

0.5

 <500






469.5

470.0

0.5

 <500






470.0

470.5

0.5

 <500






470.5

471.0

0.5

 <500






471.0

471.5

0.5

 <500






471.5

472.0

0.5

 <500






472.5

473.0

0.5

 <500






480.0

480.5

0.5

 <500






481.5

482.0

0.5

 <500






482.0

482.5

0.5

 <500 - 610






482.5

483.0

0.5

 <500






483.5

484.0

0.5

 <500 - 520






484.0

484.5

0.5

 <500






484.5

485.0

0.5

1100 - 1100






485.0

485.5

0.5

 <500






485.5

486.0

0.5

 <500 - 1400






486.0

486.5

0.5

 <500 - 600






486.5

487.0

0.5

 <500






491.0

491.5

0.5

 <500






491.5

492.0

0.5

 <500






495.5

496.0

0.5

 <500 - 3400






496.0

496.5

0.5

 <500 - 750






496.5

497.0

0.5

 <500 - 700






499.0

499.5

0.5

 <500






499.5

500.0

0.5

 <500 - 1200






500.0

500.5

0.5

 <500 - 1200






500.5

501.0

0.5

 <500






502.0

502.5

0.5

 <500 - 800






502.5

503.0

0.5

900 - 900






503.0

503.5

0.5

 <500 - 650






505.0

505.5

0.5

 <500






509.5

510.0

0.5

 <500






510.0

510.5

0.5

 <500






515.5

516.0

0.5

 <500






516.0

516.5

0.5

 <500

RK-25-233

330

-70

694.0

109.7

561.0

561.5

0.5

 <500 - 600






561.5

562.0

0.5

 <500






562.0

563.5

1.5

 <500






563.5

564.0

0.5

 <500 - 650






564.0

565.0

1.0

 <500






565.0

565.5

0.5

 <500 - 700






565.5

566.0

0.5

 <500






566.0

566.5

0.5

 <500 - 600






566.5

567.0

0.5

 <500






567.0

567.5

0.5

 <500 - 600






567.5

569.5

2.0

 <500






570.0

571.0

1.0

 <500






571.0

571.5

0.5

 <500 - 600






571.5

572.0

0.5

 <500






575.0

575.5

0.5

 <500






576.0

576.5

0.5

 <500 - 1000






576.5

577.0

0.5

 <500 - 600






577.0

577.5

0.5

600 - 1200






577.5

578.0

0.5

 <500 - 1100






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

 <500 - 600






581.5

582.0

0.5

 <500






582.5

584.0

1.5

 <500






584.0

584.5

0.5

 <500 - 4000






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

 <500 - 650






589.0

589.5

0.5

700 - 2400






589.5

591.0

1.5

 <500






591.0

591.5

0.5

 <500 - 1000






591.5

592.5

1.0

 <500






592.5

593.0

0.5

 <500 - 650






593.0

593.5

0.5

 <500






593.5

594.0

0.5

 <500 - 600






594.0

594.5

0.5

 <500 - 1200






594.5

595.0

0.5

1200 - 2400






595.0

595.5

0.5

500 - 700






603.0

603.5

0.5

 <500






603.5

604.0

0.5

 <500 - 4500






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

 <500






607.0

607.5

0.5

500 - 1500






607.5

608.0

0.5

 <500 - 1300






608.0

609.0

1.0

 <500






609.0

609.5

0.5

 <500






624.5

625.0

0.5

 <500 - 600






625.0

625.5

0.5

 <500 - 1100






625.5

626.0

0.5

 <500 - 550






629.5

630.0

0.5

 <500






630.0

630.5

0.5

 <500 - 750






633.5

634.0

0.5

 <500






634.0

634.5

0.5

 <500 - 550






634.5

635.0

0.5

 <500 - 900






635.0

635.5

0.5

 <500 - 1100






635.5

636.0

0.5

2500 - 5000

RK-25-234

330

-70

747.0

113.0

668.0

668.5

0.5

 <500






672.0

672.5

0.5

 <500 - 1200






672.5

673.0

0.5

 <500 - 630






675.0

675.5

0.5

 <500 -520






675.5

676.0

0.5

 <500






677.0

677.5

0.5

 <500 - 520






677.5

678.0

0.5

 <500






679.5

680.0

0.5

 <500






682.0

682.5

0.5

 <500






685.0

685.5

0.5

 <500






687.0

687.5

0.5

 <500 - 9000






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

 <500 - 8800

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

 <500






379.0

379.5

0.5

 <500 - 600






379.5

380.0

0.5

 <500 - 1100






380.0

380.5

0.5

 <500






380.5

381.0

0.5

870 - 3400






381.0

381.5

0.5

1300 - 4400






381.5

382.0

0.5

 <500 - 1450






382.0

382.5

0.5

 <500






393.0

394.0

1.0

 <500






395.0

396.0

1.0

 <500






396.0

396.5

0.5

 <500 - 1000






396.5

397.0

0.5

600 - 1050






397.0

397.5

0.5

550 - 1180






400.5

401.0

0.5

 <500






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

 <500 - 2250






404.0

404.5

0.5

 <500






411.0

414.0

3.0

 <500






414.5

415.0

0.5

 <500






427.5

428.0

0.5

 <500 - 570






428.0

428.5

0.5

 <500 - 600






457.5

458.0

0.5

 <500 - 525






458.0

458.5

0.5

 <500 - 720






458.5

459.0

0.5

 <500 - 530






459.0

459.5

0.5

 <500 - 600






459.5

460.0

0.5

 <500






460.0

460.5

0.5

 <500 - 550






461.5

462.0

0.5

 <500






464.0

465.0

1.0

 <500






465.0

465.5

0.5

 <500 - 3000






465.5

466.0

0.5

 <500 -980






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

 <500 - 550






475.5

477.5

2.0

 <500






477.5

478.0

0.5

 <500 - 860






478.0

478.5

0.5

 <500






478.5

479.0

0.5

 <500 - 950






516.5

517.0

0.5

 <500

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 <500 cps, this refers to local low radiometric zones within the overall radioactive 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 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.

Cision View original content to download multimedia:https://www.prnewswire.com/news-releases/nexgen-announces-best-ever-discovery-phase-intercept-at-rook-i-property-302409044.html

SOURCE NexGen Energy Ltd.

FAQ

What are the key findings from NexGen's (NXE) latest drilling results at Rook I?

Drillhole RK-25-232 intercepted 3.9m of >61,000 cps uranium mineralization within a 13.8m interval, representing the best discovery-phase intercept at any NexGen property.

How has the high-grade zone at Patterson Corridor East (PCE) expanded in 2025?

The high-grade subdomain has doubled since November 2024, now reaching 210m strike length and 335m vertical extent, up from 100m strike and 170m vertical extent.

What is the significance of RK-25-232's results for NexGen's (NXE) exploration program?

The results indicate PCE could rival the Arrow Deposit at the same development stage, suggesting a significant regional mineralizing event at Rook I.

When will NexGen (NXE) report the assay results from their 2024 drilling program?

Assay results from 2024 drilling are expected to be reported in April 2025, once all results have been received and verified.
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