IsoEnergy Intersects 4.0m of 20.5% U3O8 in Drill Hole LE20‐40 and Drills More Off‐Scale Uranium Mineralization
IsoEnergy Intersects 4.0m of 20.5% U3O8 in Drill Hole LE20‐40
and Drills More Off‐Scale Uranium Mineralization
V a n c o u v e r , B C , M a r c h 1 8 , 2 0 2 0 – I s o E n e r g y L t d . ( “IsoEnergy” or the “Company”) (TSXV: ISO; OTCQX: ISENF) is
pleased to report additional results from the winter 2020 drill ing program at the Hurricane zone. The Hurricane
zone is a new discovery of high‐grade uranium mineralization on the Company’s 100% owned Larocque East property
(the “Property”) in the Eastern Athabasca Basin of Saskatchewan (Figure 1).
Highlights:
Assays received from previously reported drill hole LE20‐40 ave rage 20.5% U3O8 over 4.0m from 322.5 to
326.5m
The last six drill holes at the Hurricane zone all intersected thick intervals (>7m) of strong uranium
mineralization, including two with off‐scale sub‐intervals (>65 ,000CPS on the RS‐125 hand‐held
spectrometer, the “RS‐125”)
Assays from the final six drill holes at the Hurricane zone are still pending
Craig Parry, Chief Executive Officer commented: “I’d like to congratulate our field crews on a very successful drilling
program. The program was delivered safely and efficiently whilst generating many intersections of strong uranium
mineralization.”
Steve Blower, Vice President of Exploration commented: “I’m enc ouraged by the number of thick intersections of
very strong uranium mineralization encountered in this drilling p r o g r a m . T h e p o t e n t i a l f o r m o r e o f t h e s e
intersections at the Hurricane zone remains very high, as most of the cross‐sections are yet to be closed off.”
Assays Received
Drill Hole LE20‐40 (Hurricane Section 4435E)
Drill hole LE20‐40 was completed o n section with (and 8.5m sout h of) previously reported drill hole LE20‐34 (8.5m
@ 33.9% U 3O8) to evaluate the extent of high‐grade mineralization to the so uth of that drill hole. It successfully
intersected 4.0m of strong uranium mineralization that averages 20.5% U3O8 from 322.5 to 326.5m, including a sub‐
interval of very strong mineralization that averages 53.8% U 3O8 over 1.5m. Figure 2 shows the drill holes in plan‐
view. Figure 3 shows the drill holes plotted on a cross‐section . T a b l e 1 s u m m a r i z e s t h e assay and radioactivity
results at the Hurricane zone.
Drill holes LE20‐36 and 38 (Hurricane Section 4460E)
Drill holes LE20‐36 and 38 were co mpleted on section 4460E as follow‐ups to the north and south, respectively, of
mineralization previously reported in drill hole LE20‐30 (5.5m @ 7.1% U3O8). Radioactivity in these drill holes was
reported previously. Drill hole LE20‐36 was completed 15m north of LE20‐30 and it intersected 3.7% U3O8 over 1.0m
from 332.5 to 333.5m, toward the northern margin of the Hurrica ne zone. Drill hole LE20‐38 was completed 14m
south of LE20‐30 and intersected 7.5m @ 2.0% U 3O8 from 319.5 to 327.0m. Figures 2 and 4 show the drill holes in
plan and cross‐section view, respectively.
Drill holes LE20‐42 and LE20‐44 (Hurricane Sections 4410E and 4460E, respectively)
Drill holes LE20‐42 and 44 were completed 16m west and 36m east , respectively, of strongly mineralized drill hole
LE20‐34 (Figure 2). Both drill holes intersected weak uranium mineralization averaging 0.4% U3O8 over 3.0m in LE20‐
42 (Figure 5) and 0.3% U3O8 over 1.5m in LE20‐44 (Figure 4). These drill holes are interpreted to be just north of the
trend of higher‐grade mineralization intersected in drill hole LE20‐34.
New Intersections of Radioactivity
Drill Hole LE20‐51 (Hurricane Section 4510E)
Drilled on section with, and 8m south of drill hole LE20‐32A, drill hole LE20‐51 was designed to evaluate the potential
for additional high‐grade mineralization south of that drill hole. LE20‐51 successfully intersected a 7.5m thick zone
of strong uranium mineralization from 322.5 to 330.0m that includes a 3.0m subinterval of continuous mineralization
measuring >30,000CPS (RS‐125) (Figures 2 and 6). The subinterv al contains abundant “worm‐rock” textured
intergrowths of pitchblende and hematite along with common nick el mineralization. A core photo is provided in
Figure 7.
Drill Hole LE20‐52 (Hurricane Section 4435E)
This drill hole was designed to evaluate the potential for addi tional high‐grade mineralization to the south of drill
holes LE20‐40 and LE20‐34. It successfully intersected 7.5m of strong uranium mineralization from 318.5 to 326.0m,
7m south of drill hole LE20‐40 (Figures 2 and 3). The interval includes 1.5m of continuous off‐scale radioactivity on
the RS‐125.
Drill Hole LE20‐53 (Hu rricane Section 4410E)
Completed 25m along‐strike to the west of drill hole LE20‐52, this drill hole successfully intersected 10.5m of strong
uranium mineralization from 317.5 to 328.0m (Figures 2 and 5). The intersection includes a 3.0m subinterval of very
strong uranium mineralization measuring >20,000CPS (RS‐125). It also includes a 0.5m zone from 326.0 to 326.5m
that is off‐scale on the RS‐125.
Drill Holes LE20‐46 and LE20‐ 48 (Hurricane Section 4485E)
These drill holes were designed to evaluate the potential for a dditional high‐grade uranium mineralization to the
north and south of drill hole LE19‐12 (Figures 2 and 8). Both of the drill holes intersected thick intervals of uranium
mineralization. Drill hole LE20‐46 intersected 10m (from 318.0 to 328.0m) of strong uranium mineralization 6m
north of LE19‐12, including 2.0m that averages >20,000CPS (RS‐1 25). Drill hole LE20‐48 i ntersected 11.5m (from
316.0‐317.5m) of uranium mineralization 12m south of LE19‐12, including 0.5m that averages >20,000 CPS (RS‐125).
Drill Hole LE20‐49 (Hu rricane Section 4510E)
Drilled 15m north of drill hole LE20‐32A, drill hole LE20‐49 in tersected 9m of uranium mineralization from 320.5 to
329.5m, including 1m that averages >10,000CPS (RS‐125) (Figures 2 and 6).
Drilling to the East of the Hurricane Zone
Drill holes LE20‐43, 45A, 47 and 50 were completed up to 1.6km east of the Hurricane zone. Although no uranium
mineralization was intersected, several important features were observed in the drill core that will require follow‐
up drilling in the area. These include strong graphitic brittle faults in the basement and strong sandstone alteration
zones similar to those associated with uranium mineralization a t the Hurricane zone. Geochemical analyses from
the fault zones and alteration haloes are pending.
Next Steps
Winter drilling is now complete at the Larocque East property. Assays for the final six drill holes completed at the
Hurricane zone are pending. Data compilation and interpretation are underway. Plans for a summer drilling
program that will continue to define the extent of the Hurricane zone are being developed.
The Larocque East Property and the Hurricane Zone
The 100% owned Larocque East property consists of 20 mineral claims totaling 8,371 ha and is not encumbered by
any royalties or other interests. Larocque East is immediately a d j a c e n t t o t h e n o r t h e n d o f I s o E n e r g y ’ s G e i g e r
property and is 35 km northwest of Orano Canada’s McClean Lake uranium mine and mill.
Along with other target areas, the Property covers a 15‐kilomet re‐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 occurrence s on Cameco Corp.’s neighbouring property to the
southwest of Larocque East. The Hurricane zone was discovered in July, 2018 and was followed up with 29 drill holes
in 2019. Dimensions are currently 575m along‐strike, 40m wide and up to 11m thick. The zone is open for expansion
along‐strike to the east and on most sections. Mineralization is polymetallic and commonly straddles the sub‐
Athabasca unconformity 320 m below surface. The best intersect ion to date is 33.9% U 3O8 over 8.5m in drill hole
LE20‐34. Drilling at Cameco Corp.’s Larocque Lake zone on the neighbouring property to the southwest has returned
historical intersections of up to 29.9% U3O8 over 7.0m in drill hole Q22‐040. 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 uranium deposits in the eastern Athabasca Basin. Import antly, the sandstone cover on the Property is thin,
ranging between 140m and 330m in previous drilling. In additio n to the Hurricane zone discovery, four historical
drill holes have intersected weak uranium mineralization at other locations on the Property to date.
Table 1 – Drill 1 2020 Hurricane Zone Results
Hole‐ID From (m) To (m) Length (m) Radioactivity 1,2 Chemical Assays Orientation Location
(CPS) U 3O8 (%) Ni (%) Co (%) (Azm/Dip)
LE20‐303 330.0 335.5 5.5 >500 7.1 0.9 0.3 180/‐80 Section 4460E
incl. 331.0 331.5 0.5 >10,000 3.4 0.1 0.1
and incl. 332.0 333.5 1.5 >20,000 24.0 2.7 0.5
LE20‐32A3 329.5 338.0 8.5 >500 19.6 1.1 0.1 180/‐80 Section 4510E
incl. 334.5 337.0 2.5 >20,000 63.6 0.4 0.0
incl. 335.0 336.5 1.5 Off‐scale 5 76.7 0.3 0.0
LE20‐343 326.0 334.5 8.5 >500 33.9 0.5 0.1 180/‐80 Section 4435E
incl. 328.0 333.0 5.0 >20,000 57.1 0.7 0.1
incl. 329.5 331.5 2.0 Off‐scale 5 62.8 0.4 0.1
LE20‐364 332.5 333.5 1.0 >500 3.7 1.0 0.8 180/‐80 Section 4460E
incl. 332.5 333.0 0.5 >20,000 5.5 1.3 1.0
LE20‐384 319.5 327.0 7.5 >500 2.0 0.2 0.2 000/‐90 Section 4460E
incl. 325.0 325.5 0.5 >20,000 3.5 0.0 0.0
and incl. 326.0 326.5 0.5 >20,000 9.8 0.1 0.2
LE20‐404 319.5 320.5 1.0 >500 0.1 0.1 0.1 000/‐90 Section 4435E
and 322.5 326.5 4.0 >500 20.5 1.0 0.0
incl. 323.0 324.5 1.5 >20,000 53.8 2.3 0.0
incl. 323.0 323.5 0.5 Off‐scale 5 64.9 0.2 0.1
LE20‐42 326.0 329.0 3.0 >500 0.4 0.2 0.4 000/‐90 Section 4410E
LE20‐44 325.5 326.0 0.5 >500 0.2 0.0 0.0 000/‐90 Section 4460E
and 327.5 329.0 1.5 >500 0.3 0.6 0.7
LE20‐46 318.0 328.0 10.0 >500 Pending 000/‐90 Section 4485E
Incl. 323.0 325.0 2.0 >20,000
and 326.0 327.0 1.0 >10,000
LE20‐48 316.0 327.5 11.5 >500 Pending 000/‐90 Section 4485E
Incl. 321.0 321.5 0.5 >10,000
and incl. 324.0 327.0 3.0 >10,000
incl. 324.5 325.0 0.5 >20,000
LE20‐49 320.5 329.5 9.0 >500 Pending 000/‐90 Section 4510E
incl. 326.5 327.5 1.0 >10,000
LE20‐51 322.5 330.0 7.5 >500 Pending 000/‐90 Section 4510E
incl. 325.5 329.0 3.5 >10,000
Incl. 326.0 329.0 3.0 >20,000
LE20‐52 312.5 313.0 0.5 >500 Pending 000/‐90 Section 4435E
and 318.5 326.0 7.5 >500
incl. 322.5 325.0 2.5 >10,000
incl. 322.5 324.0 1.5 Off‐scale 5
LE20‐53 317.5 328.0 10.5 >500 Pending 000/‐90 Section 4410E
incl. 324.5 327.5 3.0 >20,000
incl. 326.0 326.5 0.5 Off‐scale 5
Notes: 1. Radioactivity is total gamma from drill core measur ed with an RS‐125 hand‐held spectrometer
2. Measurements of total gamma on drill core are an indication of uranium content, but may not correlate with chemical assays
3. Radioactivity and chemical assays previously disclosed
4. Radioactivity previously disclosed
5. Off‐scale radioactivity is defined as exceeding 65,536 cps, the maximum measurable by an RS‐125 spectrometer
Figure 1 – Larocque East Property Map
Figure 2 – Western Hurricane Zone Drill Hole Location Map
Figure 3 – Cross Section 4435E (Drill Holes LE20‐40 and LE20‐52)
Figure 4 – Cross Section 4460E (Drill Holes LE20‐36 and LE20‐38 and LE20‐44)