Announcement • Apr 09
Isoenergy Ltd Announces Results from Winter Exploration Drilling Program At Larocque East Project
IsoEnergy Ltd. announced results from its recently completed 2026 winter exploration drilling program at the Larocque East project, home to the high-grade Hurricane deposit in the eastern Athabasca Basin, Canada. The program was expanded based on encouraging results, increasing from an initial plan of 13 diamond drill holes totaling 5,200 m to 17 diamond drill holes totaling 6,804 m, targeting potential resource expansion at the Deposit and testing greenfield targets up to three kilometres east along the Larocque Trend. Hurricane hosts a current Mineral Resource of 48.6 Mlb U3O8 at 34.5% U3O8 Indicated, and 2.7 Mlb U3O8 at 2.2% U3O8 Inferred. Additional mineralized fault strands have been identified across the width of the Hurricane South Trend, highlighting a broader and more prospective corridor than previously interpreted, with potential for additional zones within underexplored areas. Drill hole LE26-248, drilled within the low-grade resource envelope, intersected strongly elevated radioactivity returning an average RS-125 spectrometer reading on drill core of 30,050 counts per second over 1.0 m (local off-scale readings of >65,500 cps), within a broader zone of 11,275 cps over 3.5 m, in the newly reinterpreted L fault zone within the South Trend. Mineralization has now been intersected in multiple holes along the South Trend up to 540 m east of the Deposit footprint. Strongly elevated radioactivity intersected in multiple 2026 holes builds on past results in demonstrating the growing scale and prospectivity of this trend. LE26-241 (100 m east of LE26-248): Intersected strongly elevated radioactivity in the lower 8 m of sandstone above the unconformity at 325.9 m, including 3,712 cps over 0.5 m. LE26-243 (180 m east of LE26-248): Intersected an average of 10,000 cps over a 0.5 m within an interval of elevated radioactivity in the lower 6 m of sandstone above the unconformity at 328.9 m. LE26-234 (560 m east of LE26-248): Intersected two intervals of elevated radioactivity. A 1.5 m interval, including 6,450 cps over 0.5 m, within altered lower sandstone (moderate to strong clay alteration, quartz dissolution, and faults) located 26 m above the unconformity at 358.9 m; and a 2.5 m interval in the basal sandstone immediately above the unconformity, including 1,270 cps over 0.5 m. Geochemical results are pending as IsoEnergy prepares for summer drilling. All samples from the winter drill program have been submitted to the Saskatchewan Research Council Geoanalytical Laboratory, with assay results anticipated in due course. Winter drilling focused on resource expansion targets along the North and South trends that flank the Hurricane deposit. These trends are situated within a low seismic velocity anomaly identified by ambient noise tomography, which is interpreted to map the prospective Hurricane alteration zone. Uranium mineralization was intersected on both trends in 2026 drill holes, building on intersections along these two trends in 2025. Additionally, three drill holes tested targets up to three kilometres along trend to the east of the Hurricane deposit. The Hurricane South Trend is a compelling exploration trend with mineralization intersected in multiple holes over a 540 m strike length to the east of the Deposit. Winter 2026 drilling continued to test the South Trend of the Deposit and along strike to the east, building on positive results from 2025 that intersected mineralization near the unconformity in drill holes LE25-207 and LE25-210, and in previous holes LE21-101 and LE22-115A. Results from the 2026 winter drilling program continue to demonstrate the potential for a significant unconformity-style uranium discovery along this trend. Two holes, LE26-244 and LE26-248, were drilled within the footprint of the low-grade zone in the southwestern portion of the Deposit, with LE26-249 drilled approximately 40 m along strike to the east of LE26-248 to follow up on strongly elevated radioactivity intersected in LE26-248 on the newly redefined L Fault Zone. The L Fault Zone is the southernmost east-striking structure recognized at Hurricane, consisting of one or more fault strands within the South Trend. Exploration on the South Trend has historically focused on the J and K faults that control mineralization in the southern high-grade lens of the Hurricane deposit. The 30,050 cps result in LE26-248 highlights the prospectivity of the L Fault Zone, and future drilling will look to better define its geometry, controls on mineralization, and continuity along strike. LE26-248 returned 30,050 cps over 1.0 m (with local off-scale peak readings >65,500 cps) straddling the unconformity at 330.2 m within a broader interval that averaged 11,275 cps over 3.5 m. Anomalous radioactivity exceeding 400 cps commences within the sooty pyrite zone in the basal sandstone, extending into the graphitic pelite below. The sandstone column from 143.5 m to the unconformity is characterized by strongly pervasive bleaching associated with illitic and kaolinitic clay alteration, indicative of a well-developed hydrothermal system characteristic of unconformity-style uranium deposits in the Athabasca Basin. Two zones of structural disruption were intersected: a 14.3 m (drill width) wide fault zone at 251.7 m characterized by intermittent broken core and quartz dissolution, preceded above by a weak to moderate pervasive hematite overprint from 143.5 m; and a 13.3 m (drill width) wide fault zone at 303.7 m characterized by broken, blocky and friable sandstone with a strong hydrothermal hematite overprint transitioning to a pervasive sooty pyrite overprint at 312.1 m that extends to the unconformity. LE26-244 returned up to 1,150 cps over 0.5 m within a broader interval averaging 717 cps over 1.5 m, associated with sooty pyrite in the basal sandstone immediately above the unconformity at 332.8 m. The sandstone column is characterized by progressive bleaching and illitic clay alteration from surface, with three discrete zones of structural disruption: an 8.6 m (drill width) wide fault zone associated with strong pervasive limonite staining at 164.4 m, a 22.7 m (drill width) wide fault zone characterized by quartz dissolution and broken and blocky core from 276.9 to 299.6 m, and a 10.7 m (drill width) wide fault zone from 313.0 to 323.7 m associated with a strong hydrothermal hematite overprint. Below the lowermost fault zone, the sandstone is grey and reduced with a pervasive sooty pyrite overprint, transitioning to very reduced dark grey to black core from 329.8 m to the unconformity. Graphitic pelite was intersected in the basement below. While the radioactivity returned in LE26-244 is lower grade than the adjacent LE26-248, the well-developed alteration, the degree of structural disruption, and sooty pyrite reduction front at the unconformity contact remain highly prospective and warrant further evaluation.