IsoEnergy Drills 8.5m of 3.2% U3O8 in Drill Hole LE19-12, Including 1.0m of 14.3% U3O8 at the Hurricane Zone

VANCOUVER, April 16, 2019 - IsoEnergy Ltd. ("IsoEnergy" or the "Company") (TSXV: ISO; OTCQX: ISENF) is pleased to announce assay results for the last drill holes from the winter 2019 drilling program.  Drill hole LE19-12 was collared 75m to the west of the discovery section and intersected 8.5m of 3.2% U₃O₈, 2.1% Ni and 0.2% Co, including 1.0m of 14.3% U₃O₈ and 1.1% Ni.  The final drill hole of the program, LE19-13, was collared 75m east of the discovery section and intersected 2.5m of 0.6% U₃O₈, 0.2% Ni and 0.5% Co, including 0.5m of 1.6% U₃O₈, 0.4% Ni and 1.1% Co.

Highlights

• Drill hole LE19-12 intersected 8.5m of 3.2% U₃O₈, 2.1% Ni and 0.2% Co
• The mineralization at Hurricane remains open along strike and on each section drilled to date
• The company is fully funded for an aggressive follow-up drill campaign this summer

The Hurricane zone is a new discovery of shallow (330m below surface), high-grade uranium mineralization on the Company's 100% owned Larocque East property (the "Property") in the eastern Athabasca Basin of northern Saskatchewan (Figure 1).  The Company recently completed the first follow-up drilling program after the discovery intersection in July 2018.  Eleven of the twelve drill holes in the follow-up winter campaign intersected significant uranium mineralization.  Hurricane now measures 150m (long) x 38m (wide) x up to 8.5m thick.  The zone is open on all five sections drilled to date and along strike in both directions.  The Company, having raised $5.5 million in December 2018, remains fully funded for a follow-up drilling campaign that is planned for the summer.

Craig Parry, Chief Executive Officer commented: "I am impressed by the continued growth of our Hurricane discovery.  The thicknesses and grades of these intercepts are consistent with other high-grade deposits in the eastern Athabasca Basin.  It is worth noting that Hurricane is in an excellent location, at a relatively shallow depth, not covered by any bodies of water and is within 40 km of the modern, high-grade McClean Lake uranium mill that currently has excess capacity.  The team has done a tremendous job in making this discovery and advancing the project and are now eagerly preparing for our summer drill program.  Given our strike rate to date – twelve of the thirteen holes we have drilled have hit mineralization – and the nature and extent of the discovery, we are optimistic about being able to deliver more positive news flow in the coming months."

Steve Blower, Vice President, Exploration commented: "These 50m step-out intersections confirm the substantial size of the Hurricane zone.  We're about to kick off a program of ground DC-Resistivity geophysics that covers the Hurricane zone plus over five km of high-potential strike length extending to the east.  These results will be used to help with targeting for a 14-hole, 6,000m follow-up drilling campaign in the immediate Hurricane area planned for this summer and will also aid future exploration efforts further afield."

LE19-12

Vertical drill hole LE19-12 was drilled on section 4485E, 75m west of the discovery section and 76m east of the property boundary.  The drill hole intersected an 8.5m interval of fracture controlled, disseminated, replacement and breccia fill styles of pitchblende uranium mineralization that averages 3.2% U₃O₈, 2.1% Ni and 0.2% Co.  This long interval includes a 1.0m section that averages 14.3% U₃O₈ and 1.1% Ni, plus another 0.5m section that averages 12.8% U₃O₈, 15.0% Ni and 0.4% Co.  The results are summarized in Table 1.  Figure 2 shows the location of the drill hole in plan-view and Figure 3 shows the location relative to contoured grade X thickness values.  Figure 4 shows the location on a cross-section.  Note that the only other drill hole on this section, LE19-11, is located 28 metres to the north of LE19-12 and is also mineralized.  The mineralization can be seen in the core photos of Figure 5.

LE19-13

Collared on section 4635E, 75 metres east of the discovery section, drill hole LE19-13 is the furthest hole drilled to the east on the Hurricane zone.  It intersected uranium mineralization 50 metres east of previously disclosed drill hole LE19-06 (Table 1).  Extensive faulting in the basal sandstone suggests that the optimal location on this section was overshot.  The main intersection consists of 2.5m of fracture controlled, disseminated and replacement styles of pitchblende uranium mineralization that averages 0.6% U₃O₈.  This includes a 0.5m section that averages 1.6% U₃O₈, as summarized in Table 1.  Figure 6 shows the location of the drill hole on a cross-section. 

Next Steps

A 53 line-km ground DC-resistivity survey will begin shortly on the Larocque East property.  The survey will cover the Hurricane zone area and approximately 5.5km of highly prospective graphitic conductors that extend to the east of the zone.  The results of the survey will be used to help target a planned follow-up drilling campaign in the immediate Hurricane zone area expected to begin in July, 2019. 

Larocque East

Larocque East consists of 6 mineral claims totaling 3,200 hectares and was purchased in May, 2018.  The Property is owned 100% by IsoEnergy and is not encumbered by any royalties or other interests.  Larocque East is immediately adjacent to the north end of IsoEnergy's Geiger property and is 35 kilometres northwest of Orano Canada's McClean Lake uranium mine and mill. 

The Property covers a 15-kilometre-long northeast extension of the Larocque Lake conductor system; a trend of graphitic metasedimentary basement rocks that is associated with significant uranium mineralization at the Hurricane zone, and in several occurrences on a neighbouring property to the southwest of Larocque East.  The closest of these to Larocque East are the Larocque Lake and Larocque North zones, which are located 6.5 kilometres and 0.4 kilometres, respectively, to the southwest of the western Larocque East property boundary.  Drilling at the Larocque Lake zone has returned historical intersections of up to 29.9% U₃O₈ over 7.0 metres in drill hole Q22-040.  Drilling at the Larocque North zone has returned intersections of up to 2.05% U₃O₈ over 0.6 metres in drill hole Q22-16.  Like the nearby Geiger property, Larocque East is located adjacent to the Wollaston-Mudjatik transition zone - a major crustal suture related to most of the major uranium deposits in the eastern Athabasca Basin.  Importantly, the sandstone cover on Larocque East is thin, ranging between 140 metres and 330 metres in previous drilling. 

In addition to the Hurricane zone discovery, four historical drill holes have intersected weak uranium mineralization at other locations on the Larocque East property to date, including drill hole KER-07 (0.12% U₃O₈ over 0.1 metre), located 400 metres east of the discovery section. 

Table 1 – Hurricane Zone 2019 Drilling Radioactive Intervals

Qualified Person Statement

The scientific and technical information contained in this news release was prepared by Andy Carmichael, P.Geo., IsoEnergy's Senior Geologist, who is a "qualified person" (as defined in National Instrument 43-101 – Standards of Disclosure for Mineral Projects).  Mr. Carmichael has verified the data disclosed.  This news release refers to properties other than those in which the Company has an interest. Mineralization on those other properties is not necessarily indicative of mineralization on the Company's properties.  An RS-125 hand-held spectrometer was used to verify that the radioactivity is due to uranium.  As the drill holes reported herein are vertical or near-vertical, and the mineralization is interpreted to be horizontal, the true thickness is expected to be within 90% of the cored intervals.

About IsoEnergy

IsoEnergy is a well-funded uranium exploration and development company with a portfolio of prospective projects in the eastern Athabasca Basin in Saskatchewan, Canada and a historic inferred mineral resource estimate at the Mountain Lake uranium deposit in Nunavut.  IsoEnergy is led by a Board and Management team with a track record of success in uranium exploration, development and operations.  The Company was founded and is supported by the team at its major shareholder, NexGen Energy Ltd.

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SOURCE IsoEnergy Ltd.