Patterson Corridor East Delivers Exceptional Results

VANCOUVER - NexGen Energy Ltd. on 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 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, 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, 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, said, ”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."