NexGen Energy Ltd. has expanded the vertical extent of the high-grade uranium subdomain at the Patterson Corridor East discovery within the Rook I project in Saskatchewan by 94 metres, reaching a total vertical extent of 644 metres at a depth of 930 metres.

The milestone result came from drill hole RK-26-293, which intersected a cumulative 4.7 metres of radioactivity exceeding 10,000 counts per second, including a 0.1-metre interval above 61,000 counts per second.

Meanwhile, a down-plunge test hole, RK-26-290c1, encountered multiple stacked uranium veins across a 40-metre section of the high-grade subdomain. The hole returned a cumulative 19.5 metres of radioactivity exceeding 10,000 counts per second, which includes a 12.9-metre zone surrounding a 5.2-metre interval of off-scale radioactivity above 61,000 counts per second.

Internal continuity was further reinforced by hole RK-26-294, intersecting a cumulative 6.9 metres above 10,000 counts per second, including 3.1 metres of off-scale mineralization. In addition, hole RK-26-296 expanded the shallowest portion of the high-grade subdomain by 50 metres along strike, returning a cumulative 3.5 metres above 10,000 counts per second.

“Growth of the high-grade subdomain continues to exceed expectations with expansions across the areas of focus with mineralization still open in most directions. Establishing clear connectivity between intense high-grade intersections with RK-26-290c1 and RK-26-294, which both hit broad zones of intense uranium mineralization is a material advancement of this discovery. In addition, RK-26-293 is extremely exciting as it has expanded the high-grade subdomain by 94 m and opened this area up for potential high-impact growth of this high-grade mineralization.” — Jason Craven, Vice President of Exploration

The Patterson Corridor East discovery is situated 3.5 kilometres east of the Arrow deposit. Drilling at the project recommenced on May 28, 2026, with 20,138.7 metres completed out of a planned 42,000-metre program for the year. Eleven summer drill holes totalling 7,425.2 metres have tested the mineralized footprint to date.

“Given today's results at PCE, the team is adding a fifth drill rig for the remainder of the 2026 program. In parallel, with construction of the Rook I Project, the team is delivering on multiple fronts and simultaneously expanding the long-term growth profile of NexGen as a world leader in the provision of this key energy fuel.” — Leigh Curyer, Chief Executive Officer

Drill core samples from the ongoing campaign are being continuously submitted to the Saskatchewan Research Council Geoanalytical Laboratory for formal assay analysis.

Read the full announcement: NexGen Expands High-Grade Subdomain Vertical Extent by 17% to 644 m and Intersects Continuous Strong Mineralization Across Patterson Corridor East (PCE) while Adding Fifth Drill to Advance Optimally