IsoEnergy Completes Summer Drilling at Larocque East, Intersecting Widespread and Strongest Radioactivity to Date Along the Hurricane South Trend

IsoEnergy Ltd. ("IsoEnergy", or the "Company") (NYSE American: ISOU ); (TSX: ISO) is pleased to report on radioactive zones intersected in summer drilling along the Hurricane South Trend on the Larocque East project (the " Project "), which hosts the high-grade Hurricane deposit (" Hurricane " or the " Deposit ").

Summer drilling at Larocque East totaled 10,159 m in 26 holes, for a year-to-date total of 16,963 m in 43 drill holes (Figure 1). The summer program was expanded from a planned 8,000 m, 20-hole program to follow up on encouraging winter and early summer results ( see news release dated July 8, 2026 ). Highlights of drill core radiometric results and uranium geochemistry from the winter holes were reported on April 7, 2026 and May 12, 2026 , respectively. All samples from the summer program have been submitted to SRC Geoanalytical Laboratories and results will be reported when available.

The J, K and L faults, which comprise the Hurricane South Trend, were the focus of summer drilling. 2026 summer drill holes are colour-coded by radioactivity (cps) x core length (m) product (e.g. 1200 cps intersected along a 2 m core interval has a cps.m product of 2400). Previously released geochemical results for winter drill holes (see May 12, 2026 news release) are also shown. Unmineralized winter holes are labelled but not colour-coded for cps. 2025 and earlier drill holes are not labelled. Radiometric results for mineralized intervals in summer 2026 drill holes are provided in Table 2.

Hurricane hosts a current Mineral Resource of 48.6 Mlb U 3 O 8 at 34.5% U 3 O 8 Indicated, and 2.7 Mlb U 3 O 8 at 2.2% U 3 O 8 Inferred (see "Qualified Person Statement" below). The Project benefits from excellent infrastructure, located approximately 40 km northwest of the McClean Lake mill, and features relatively shallow mineralization at approximately 325 m 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.

The summer drill program successfully intersected widespread, strongly elevated radioactivity over a strike length of 600 m along the South Trend. 18 of the 26 holes returned intervals at or above the cut-off of >350 cps threshold over 0.5 m, 13 holes returned 1,000 cps or greater , and three holes returned over 35,000 cps including the strongest radioactivity drilled to date on the South Trend. All radioactivity results reported herein are measured on drill core as total counts per second ("cps") with three readings averaged over each 0.5 m sample interval.

Drill holes LE26-250 and LE26-273 intersected strongly elevated radioactivity on the L fault zone along strike east and west of mineralization previously reported in winter drill hole LE26-248 (4.21% U 3 O 8 over 3.5 m, including up to 11.6% U 3 O 8 over 1.0 m). LE26-250, drilled 75 m east of LE26-248 and outside the existing Hurricane footprint, intersected 11,075 cps over 3.5 m, including 43,160 cps over 0.5 m (see news release dated July 8, 2026). LE26-273, drilled 11 m west of LE26-248, intersected 14,135 cps over 3.0 m, including 36,292 cps over 1.0 m. Like LE26-248, LE6-273 was d...