IsoEnergy Resumes Summer Drilling at Hurricane South Trend, Larocque East Project, Saskatchewan – Resource World Magazine

IsoEnergy Ltd. (TSX:ISO) - Strong Radioactivity Extends the L Fault on the South Trend - Research Portal

IsoEnergy (ISO) reported spectrometer results from the first four holes of its summer drill program at the Larocque East project located in the eastern Athabasca Basin. All four holes intersected elevated radioactivity, with LE26-250 returning one of the strongest radioactive intervals on the Hurricane South Trend to date and confirming the newly identified L Fault Zone as a continuous structure along strike. We believe the high-grade mineralization along the fault was previously underweighted in the geological model and had flagged the L Fault re-interpretation as a potential re-rating event. Assays are pending, though winter grades correlated well with spectrometer readings. The zone sits at the southern edge of the trend, and its recognition as a separate control opens ground that earlier programs had ranked as secondary. Winter drilling had already pushed mineralization 540m east of the current MRE. Further step-outs could grow the resource or open new zones along the trend. Drilling has now resumed following a temporary wildfire suspension and evacuation. With the program back on schedule, we see a clean continuation of the South Trend growth story.

IsoEnergy resumes summer drilling at Hurricane South Trend, Larocque East Project, Saskatchewan – Resource World Magazine

IsoEnergy Ltd. [NYSE American: ISOU; TSX: ISO] reported that summer drilling has recommenced at the Larocque East Project, which hosts the high-grade Hurricane deposit in the eastern Athabasca Basin, Saskatchewan, Canada, following a temporary suspension and precautionary evacuation due to nearby wildfires. Prior to the temporary suspension, four of a planned 20 holes were completed with all holes intersecting mineralization, including 43,160 cps over 0.5 metres, confirming the continuity of the newly identified L Fault Zone along the Hurricane South Trend. IsoEnergy’s summer program is targeting 8,000 metres of diamond drilling, in up to 20 drill holes, focused on the highly prospective Hurricane South 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. The project benefits from excellent infrastructure, located approximately 40 km northwest of the McClean Lake mill, and features relatively shallow mineralization at approximately 325 metres depth, supporting efficient exploration and future development optionality. The deposit is located on the Larocque Trend, an important regional structure that also hosts other notable high-grade occurrences including those on Cameco and Orano’s Dawn Lake joint venture. Highlights – Mineralization Confirmed Along Strike on the L Fault Zone: LE26-250, drilled approximately 75 metres east of the high-grade winter 2026 intercept in LE26-248 (4.21% U3O8 over 3.5 m, including 11.61% U3O8 over 1.0 m), intersected 11,075 cps over 3.5 metres, including 43,160 cps over 0.5 meters (all radioactivity reported herein are averages of three points measured over 0.5 metres on drill core with an RS-125 spectrometer), extending the continuity of mineralization east of LE26-248 along strike on the L Fault Zone on the Hurricane South Trend. Mineralization Intersected in Every Completed Hole: All four completed drill holes returned elevated radioactivity, reinforcing the continuity and prospectivity of the Hurricane South Trend identified during the 2025 and winter 2026 results along the Hurricane South Trend. Summer Drilling Resumes: Approximately 2,100 metres of drilling had been drilled across four completed holes and two in progress prior to the temporary suspension due to nearby wildfire, with two additional holes in progress. The Company remains on track to complete the ~8,000 metres, 20-hole summer program as planned. Strategic Land Position Strengthened: 61,830 ha were added through staking in 2026 across the Dorado Joint Venture and IsoEnergy’s Larocque West, Hawk, Evergreen, East Rim and Ledge projects, enhancing exposure to prospective uranium targets across the eastern Athabasca Basin. Coverage of Prospective Corridors Expanded: The addition of 31,293 ha under option from GEM Oil Inc. extends the Larocque West project, increasing coverage of highly prospective structural corridors and regional exploration targets. Dan Brisbin, Vice President of Exploration, stated, “Our team is excited to resume drilling on the Hurricane South Trend, where early results from the summer program continue to reinforce the prospectivity of the trend. Every completed hole has intersected anomalous radioactivity, including 43,160 cps over 0.5 metres. These results continue to demonstrate the potential to expand Hurricane mineralization beyond the current resource footprint. With the immediate fire risk abated, we anticipate completing the 8,000 metres summer drill program as designed. In addition, we have expanded and consolidated coverage of prospective corridors though staking and through an option agreement.” Drilling has resumed on the Hurricane South Trend. LE26-250, drilled approximately 75 metres to the east of LE26-248, which returned 4.21% U3O8 over 3.5 metres, including 11.61% U3O8 over 1.0 metre, successfully intersected the L Fault Zone extrapolated from LE26-248. The sandstone is strongly bleached with white interstitial clay below 193.0 metres. A 1.5-metre (all widths reported are widths along the drill hole which are not necessarily true widths) fault zone from 208.1 to 209.6 metres is broken and blocky and is grey in colour due to pervasive sooty pyrite alteration, with weak hydrothermal hematite-clay alteration. Below the fault, the sandstone is more intensely bleached, with a pervasive overprint of white interstitial clay, with weak, fracture-controlled quartz dissolution localized to fracture zones. A 43.6-metre-wide interval of several local half metre-scale zones of broken and blocky core was intersected above a fault zone, with local zones of weak quartz dissolution from 264.5 to 308.1 metres. A 10.2 metre-wide fault zone was intersected from 308.1 to 318.3 metres. Its top, from 308.1 to 309.6 metres, is characterized by broken core with a strong sooty pyrite overprint and brick red hematitic clay. Below the fault, the sandstone is strongly bleached with strong white interstitial clay, giving the core a chalky appearance. The base of the fault, from 312.3 to 318.3 metres, is characterized by several clay-coated fractures oriented nearly parallel to the core axis, one of which is associated with a pervasive brick-red hydrothermal hematite clay. Below the fault, the sandstone remains strongly bleached with moderate white interstitial clay, and overprinted by pervasive brick-red hematite to 334.8 metres. Below 334.8 metres, the sandstone remains relatively competent with a moderate, pervasive sooty pyrite overprint from 334.8 to 340.9 metres that strengthens from 340.9 to 344.0 metres. This interval returned a maximum of 43,160 cps over 0.5 metres from 342.0 to 342.5 metres, which includes a 0.3-metre zone of unconsolidated core, within a broader interval averaging 11,075 cps over 3.5 metres (341.0 – 344.5 m) above the unconformity at 345.4 metres. The sooty pyrite overprint is moderate from 344.0 metres to the unconformity. Graphitic cordierite pelite was intersected below the unconformity to 361.8 metres followed by pegmatite, semipelite, and pelite to the end of the hole at 449.0 metres. Weakly elevated radioactivity (415 cps over 0.5 m) was intersected between 346.0 m and 346.5 metres. LE26-251 tested the J Fault approximately 45 metres to the east of LE21-107, which intersected 6.5 metres averaging 20.4% U3O8 from 325.5 to 332.0 metres, including 3.5 metres averaging 34.5% U3O8 from 327.5 to 331.0 metres. The sandstone is moderately to strongly bleached below 179.0 metres, coincident with moderate pervasive hematite staining, which weakens below 221.0 metres. A 13.5-metre-wide fault zone from 211.3 to 224.8 metres is characterized by broken, blocky and fractured core with weak fracture-controlled quartz dissolution and minor fracture-hosted hematite. From 224.8 to 278.9 metres the sandstone is relatively competent and moderately bleached, with weak to moderate interstitial clay, minor fracture zones, and 0.3 metre-scale zones of increased quartz dissolution. A second 32.1-metre-wide fault zone from 278.9 to 311.0 metres is similar to the fault above but is characterized by a stronger sooty pyrite overprint, which strengthens in intervals of stronger quartz dissolution and in fracture zones. Below 311.0 metres the core is relatively competent, strongly bleached, and overprinted by white interstitial clay, with minor pervasive limonite staining. A 2.5 metre-wide fault zone from 323.5 to 326.0 metres is characterized by broken and blocky core throughout with strong quartz dissolution from 323.4 to 323.8 metres. Below the fault, the core is moderately silicified to 328.1 metres, below which the sandstone is more competent and overprinted by sooty pyrite (reduced) to the unconformity at 332.2 metres. Elevated radioactivity up to 1,580 cps was intersected over 0.5 metres from 331.5 metres to 332.0 metres within an interval with strong sooty pyrite alteration, and within a broader interval straddling the unconformity which averages 980 cps over 3.0 metres from 331.0 metres to 334.0 metres. Semipelite to pelite was intersected below the unconformity, with graphitic pelite from 344.4 m to the end of hole at 398.0 metres. A 3.4-metre fault was intersected within the graphitic pelite from 353.4 to 356.8 metres. The intersection of graphitic pelite and the interpreted target fault in the basement suggests LE26-251 was positioned slightly hanging wall of the optimal target. LE26-252 was drilled 30 metres east of LE26-234 which intersected 1.00% U3O8 over 1.5 metres (332.0-333.5 m), including 2.75% U3O8 over 0.5 metres (332.0-332.5 m). The sandstone is moderately bleached below 143.5 metres. A 21.8-metre-wide fault zone from 221.0 to 242.8 metres is characterized by broken and blocky core with strong quartz dissolution around fracture zones and strong white interstitial clay that gives the core a chalky appearance, with minor limonite present within fracture zones and intervals with increased quartz dissolution within the fault. Below the fault, the sandstone is more competent and strongly bleached with a weak pervasive limonite overprint from 242.8 to 314.0 metres, with limonite stronger in local fracture zones. From 314.0 metres the sandstone is strongly bleached with lesser limonite and moderate interstitial clay, with strong clay alteration closer to a 0.9 metre-wide fault zone from 316.1 to 317.0 metres. The fault is characterized by broken and blocky core with increased quartz dissolution. Below the fault, from 317.0 m to the unconformity, the core is relatively competent with minor local zones of strong quartz dissolution, a weak limonite overprint, and moderate to strong interstitial white clay. Minor local zones of pervasive brick-red hematite are present around fractures from 324.3 to 325.4 metres. The unconformity was intersected at 329.8 metres. Below the unconformity, semipelite to pelite with intercalated pegmatite extend to the end of the hole at 419 metres. The basement rocks are moderately to strongly clay altered to 337.7 metres, with weakly elevated radioactivity intersected within the clay altered zone (450 cps over 0.5 m from 333.5 m to 334.0 m). LE26-253 intersected the unconformity 11 metres south of LE26-249 and 44 metres east of LE21-103. The sandstone is moderately to strongly bleached below 208.5 metres and strongly bleached below 261.8 metres, with weak to moderate interstitial clay. The core is competent to 290.0 metres, below which several localized (0.2-0.5 m scale) faults characterized by clay gouge to 314.0 metres. The localized faults below 310.8 metres are overprinted by brick-red hematite staining, with lesser limonite. Below the fault zone the core is strongly bleached, weakly overprinted by sooty pyrite, and is relatively competent to 329.5 metres, with the exception of a 1.0 metre-wide broken and rubbly fault zone with increased quartz dissolution from 318.7 to 319.7 metres. Below 329.5 metres the sandstone is overprinted by moderate to strong interstitial clay to the unconformity at 340.5 metres, with a moderate pervasive hydrothermal hematite and lesser limonite overprint from 336.2 metres to the unconformity. Elevated radioactivity averaging 620 cps over 0.5 meters was recorded between 337.5 and 338.0 metres, about 3 metres above the unconformity. Graphitic pelite was intersected in the basement to 349.2 m, including an interval of weakly radioactivity (360 cps over 0.5 m between 343.0 and 343.5 m). Intercalated pelite and semipelite were intersected below the graphite to the end of the drillhole at 401.0 metres. LE26-253 tested ideal target as the drillhole intersected the L-fault at the unconformity. IsoEnergy has expanded and consolidated its land position along prospective corridors in the eastern Athabasca Basin, staking approximately 61,830 hectares across 32 claims. In addition, the company has optioned the Larocque West Extension claims from GEM Oil Inc., comprising approximately 31,293 hectares across 20 claims. The optioned claims are notably underexplored for uranium mineralization: while four drill holes have been completed on the Larocque West Extension claims, only two targeted uranium. Concurrently, IsoEnergy has elected to divest its Bulyea River property. Following the divestment, recent staking, and the GEM Oil option, IsoEnergy now holds or has access to approximately 344,812 hectares of land in the eastern Athabasca Basin, including its interest in the joint venture with Purepoint Uranium Group Inc. IsoEnergy is a leading, globally diversified uranium company with substantial current and historical mineral resources in top uranium mining jurisdictions of Canada, the U.S. and Australia at varying stages of development, providing near-, medium- and long-term leverage to rising uranium prices. IsoEnergy is currently advancing its Larocque East project in Canada’s Athabasca basin, which is home to the Hurricane deposit, boasting the world’s highest-grade indicated uranium mineral resource. IsoEnergy also holds a portfolio of permitted past-producing, conventional uranium and vanadium mines in Utah with a toll milling arrangement in place with Energy Fuels. These mines are currently on standby, ready for rapid restart as market conditions permit, positioning IsoEnergy as a near-term uranium producer.

IsoEnergy Resumes Summer Drilling at Hurricane South Trend with Strong Initial Results; 11,075 cps over 3.5 m, Including 43,160 cps Over 0.5 m, Intersected on South Trend

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