IsoEnergy Drills 4.0 m of 3.8% U3O8 in 30 m Step‐out to the East and Intersects Strong Radioactivity in 30 m Step‐Out Hole to the West, Mineralization Remains Open Along Strike Company expands drilling program based on exploration results at the Hurricane zone high‐grade uranium
IsoEnergy Drills 4.0 m of 3.8% U3O8 in 30 m Step‐out to the East and
Intersects Strong Radioactivity in 30 m Step‐Out Hole to the West,
Mineralization Remains Open Along Strike
Company expands drilling program based on exploration results at the Hurricane zone high‐grade uranium
discovery
Vancouver, BC, February 28, 2019 – IsoEnergy Ltd. (“IsoEnergy” or the “Company”) (TSXV: ISO; OTCQX: ISENF)
is pleased to announce that drill hole LE19‐06 assayed 4.0 metres of 3.8% U3O8, including 0.5 metres @ 13.7%
U3O8. LE19‐06 was collared 30 metres to the east of drill hole LE18‐0 1A, the original discovery drill hole which
returned 8.5 metres @ 1.3% U3O8 including 2.5m @ 3.6% U3O8.
LE19‐09, a 30 metre step out to the west, intersected strong radioactivity that consists of 4.5 metres of fracture
controlled, disseminated and replacement styles of pitchblende uranium mineralization (>1,000 cps RS‐125),
as summarized in Table 1. This includes 2.0 metres of strongly elevated radioactivity that averages >20,000
cps (RS‐125).
The Hurricane zone is a new discovery of high‐grade uranium min eralization on the Company’s 100% owned
Larocque East property (the “Property”) in the eastern Athabasc a Basin of northern Saskatchewan (Figure 1).
A s a r e s u l t o f i t s s u c c e s s f u l e x p l o r a t i o n e f f o r t s , t h e C o m p a n y i s e x p a n d i n g i t s 2 0 1 9 w i n t e r d r i l l p r o g r a m t o
further define the extent of the mineralization which currently stands at 60 metres long and 38 metres wide
and remains open along strike in both directions. The Company, having raised $5.5 million in December 2018,
remains fully funded for this expanded program and a follow‐up drilling campaign that is planned for the
summer.
Craig Parry, Chief Executive Officer commented: “The results of along‐strike drilling are excellent and confirm
we have made a high‐grade uranium discovery. Based on historical drilling we know the mineralized system is
at least one kilometre long and with uranium mineralization intersected in seven of eight drill holes completed
to date, an expansion of our on‐going drill program was an easy decision. The additional drilling will help to
set us up for an exciting fully funded follow‐up drilling campaign after spring break‐up.”
Steve Blower, Vice President, Exploration commented: “I’m pleas ed that our along‐strike step‐out drill holes
have hit strong uranium mineralization in both directions. With current dimensions already measuring 60
m e t r e s l o n g a n d 3 8 m e t r e s w i d e , t h e H u r r i c a n e z o n e i s g r o w i n g and is open for expansion. The tenor of
alteration in the sandstone and basement is strong and there is elevated uranium geochemistry to the top of
the sandstone – all key features of larger uranium deposits in the Athabasca basin.”
LE19‐06 (Eastern Step‐Out)
Drill hole LE19‐06 is the first along‐strike step‐out to the ea st of the discovery section. The drill hole pierced
the sub‐Athabasca unconformity 30 metres east of the discovery section and intersected two main intervals of
fracture controlled, disseminated and replacement styles of pit chblende uranium mineralization (>1,000 cps
RS‐125), as reported earlier (see news release dated February 11, 2019) and summarized in Table 1. An upper
zone of sandstone‐hosted uranium mineralization is followed by strong uranium mineralization at the
unconformity that averages 3.8% U 3O8 and 1.1% Ni over 4.0 metres. Included in the interval are max imum
values of 13.7% U3O8 and 1.2% Ni over 0.5 metres. Figure 2 shows the location of the drill hole in planview and
Figure 3 shows the location on a cross‐section. Note that the strong mineralization in LE19‐06 is open to the
south. A core photo of the mineralization is included as Figure 4.
LE19‐09 (Western Step‐Out)
Collared 30 metres west of the discovery section, drill hole LE 19‐09 intersected substantial uranium
mineralization along‐strike of previously disclosed drill holes LE18‐01A and LE19‐02 (Table 1). The main
intersection consists of 4.5 metres of fracture controlled, disseminated and replacement styles of pitchblende
uranium mineralization (>1,000 cps RS‐125), as summarized in Ta ble 1. This includes 2.0 metres of strongly
elevated radioactivity that averages >20,000 cps (RS‐125). Fig ure 5 shows the location of the drill hole on a
cross‐section. Note that the strong mineralization in drill hole LE19‐09 is open to the south. Figure 6 is a core
photo of the mineralization.
Table 1 – Hurricane Zone Radioactive Intervals
Hole‐ID From (m) To (m) Length (m) Radioactivity 1,2 (CPS) Chemical Assays Location
U 3O8 (%) Ni (%)
LE19‐023 316.5 320.0 3.5 >1,000 0.2 0.1 Section 4560E
and 326.5 330.0 3.5 >1,000 10.4 0.8
incl. 328.5 330.0 1.5 >20,000 23.6 1.6
incl. 329.0 329.5 0.5 >50,000 38.2 1.5
LE19‐033 324.0 324.5 0.5 >1,000 0.2 0.1 Section 4560E
and 326.5 329.5 3.0 >1,000 2.7 2.3
incl. 328.5 329.5 1.0 >5,000 7.6 6.6
incl. 329.0 329.5 0.5 >20,000 13.3 11.8
LE19‐044 329.0 329.5 0.5 >1,000 0.1 0 Section 4560E
333.0 333.5 0.5 >1,000 0.4 0.2
LE19‐054 No significantly elev ated radioactivity Section 4560E
LE19‐064 328.0 330.0 2.0 >1,000 0.4 0.1 Section 4585E
and 332.0 336.0 4.0 >5,000 3.8 1.1
incl. 333.5 335.5 2.0 >10,000 5.5 0.7
incl. 333.5 334.0 0.5 >20,000 13.7 1.2
LE19‐07 325.0 331.0 6.0 >1,000 Pending Section 4585E
incl. 328.0 328.5 0.5 >5,000 Pending
LE19‐08 326.5 327.0 0.5 >1,000 Pending Section 4535E
and 333.0 336.5 3.5 >1,000 Pending
incl. 335.5 336.0 0.5 >10,000 Pending
LE19‐09 325.0 329.5 4.5 >1,000 Pending Section 4535E
incl. 327.0 329.0 2.0 >20,000 Pending
Notes: 1. Radioactivity is total gamma from drill core measure d with an RS‐125 hand‐held spectrometer (RS‐125).
2. Measurements of total gamma cps on drill core are an indication of uranium content, but may not correlate with
uranium chemical assays.
3. Radioactivity and chemical assays previously disclosed.
4. Radioactivity previously disclosed.
LE19‐07 and LE19‐08
Drill holes LE19‐07 and LE19‐08 both intersected substantial le ngths of elevated radioactivity. LE19‐07 was
drilled to the north of LE19‐06 on section 4585E. It intersected a long interval (6.0 metres) of weak to moderate
radioactivity at the sub‐Athabasca unconformity. Drill hole LE 19‐08 is the first hole drilled along‐strike to the
west of the discovery section. It intersected two intervals of elevated radioactivity, including 3.5 metres of
weak to moderate radioactivity at the sub‐Athabasca unconformity. Assay results for both of these drill holes
are pending.
Expanded Program
Due to the successful intersection of uranium mineralization in all but one of the eight drill holes completed to
date, the Company has expanded the current drilling program to 12 drill holes from 10. The expanded program
allows an acceleration of more aggressive step‐outs along‐strik e of the existing intersections and is expected
to be complete by mid‐March.
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 p r o pe r t y a n d i s 3 5 k i l o m e t r e s n o r t h w e s t o f
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
c l o s e s t o f t h e s e t o L a r o c q u e E a s t a r e t h e L a r o c q u e L a k e a n d L a rocque 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, L a r o c q u e E a s t i s l o c a t e d a d j a c e n t t o t h e
Wollaston‐Mudjatik transition zone ‐ a major crustal suture rel ated 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 dr ill 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.
Figure 1 – Larocque East Property Location Map
Figure 2 –Hurricane Zone Detailed Planview
Figure 3 – Cross‐Section 4585E (Showing Drill Hole LE19‐06)
Figure 4 – Core Photo of Mineralization in Drill Hole LE19‐06
Figure 5 – Cross‐Section 4535E (Showing Drill Hole LE19‐09)