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IsoEnergy Intersects 7.5m of 22.7% U3O8 in Drill Hole LE20-52 Including 2.5m of 67.2% U3O8

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IsoEnergy Intersects 7.5m of 22.7% U3O8 in Drill Hole LE20-52 Including 2.5m of 67.2% U3O8






IsoEnergy Ltd. (TSX-V: ISO) (OTCQX: ISENF) is pleased to report final assay results from the winter 2020 drilling program at the Hurricane zone.  Discovered in 2018 at the Larocque East property, the Hurricane zone is a recent discovery of high-grade uranium mineralization.  Larocque East is 100% owned by IsoEnergy and is located in the prolific Eastern Athabasca Basin of Saskatchewan (Figure 1).


Winter Drilling Selected Highlights:


  • Drill hole LE20-52 assays average 22.7% U3O8 over 7.5m from 318.5 to 326.0m, including 67.2% U3O8 over 2.5m from 322.5 to 325.0m
  • Drill hole LE20-53 assays average 11.7% U3O8 over 10.5m from 317.5 to 328.0m, including 40.4% U3O8 over 3.0m from 324.5 to 327.5m
  • Drill Hole LE20-51 assays average 14.5% U3O8 and 3.5% Ni over 7.5m from 322.5 to 330.0m*
  • Drill Hole LE20-40 assays average 20.5% U3O8 over 4.0m from 322.5 to 326.5m*
  • Drill Hole LE20-34 assays average 33.9% U3O8 over 8.5m from 326.0 to 334.5m, including 5.0m averaging 57.1% U3O8 from 328.0 to 333.0m*
  • Drill Hole LE20-32A assays average 19.6% U3O8 over 8.5m from 329.5 to 338.0m, including 2.5m of 63.6% U3O8 from 334.5 to 337.0m*
*Previously released assay results



Craig Parry, Chief Executive Officer commented: “I’d like to congratulate our technical team on these latest results and on the highly successful winter drilling program. Drilling has continued to deliver long intervals of high-grade pitchblende uranium mineralization, confirming Hurricane as major discovery. It is worth noting that the Hurricane deposit is in an exceptional location in the eastern Athabasca close to key infrastructure and only 40km from Orano’s McLean Lake Mill.  These latest results from our winter program come at a crucial time for the uranium exploration and mining sector. In recent days we have seen the major producers announce extended closures of their mines and mills which we estimate has reduced global uranium production volumes by over 50%. Already we have seen the uranium spot price rise over 30% from $24/lb three weeks ago to $31.50/lb today, breaking the important psychological barrier of $30/lb in the process. This rise has occurred without the full impact of physical product being removed from the market and when these announced supply cuts take full effect in coming weeks, we expect to see further upward pressure on prices. Against this backdrop IsoEnergy remains well positioned with $3.5m in cash and we look forward to reporting on plans for further drilling at our high-grade Hurricane discovery.”


Steve Blower, Vice President of Exploration commented: “The last two drill holes of the campaign have returned very high-grade uranium assays over long intervals.  The southernmost drill holes on all five sections in the western end of the Hurricane zone are now all strongly mineralized.  Clearly there is room for expansion of this very high-grade area within the larger Hurricane zone footprint, which now measures 575m long, up to 40m wide and up to 11m thick.”


Final Assays Received          


 Drill Hole LE20-52 (Hurricane Section 4435E)

Drill hole LE20-52 was designed to evaluate the potential for additional high-grade mineralization to the south of drill holes LE20-40 and LE20-34 (Figures 2 and 3).  It successfully intersected a thick interval of strong uranium mineralization at the sub-Athabasca unconformity that averages 22.7% U3O8 over 7.5m from 318.5 to 326.0m.  The interval includes a very high-grade section that averages 67.2% U3O8 over 2.5m from 322.5 to 325.0m.  Within the very high-grade section is a subinterval of continuous off-scale (>65K CPS on an RS-125 handheld spectrometer) mineralization that averages 79.9% U3O8 over 1.5m from 322.5 to 324.0m.  Figure 4 is a core photo of the mineralized interval.


          Drill Hole LE20-53 (Hurricane Section 4410E)

Drill hole LE20-53 was completed 25m along-strike to the west of drill hole LE20-52 (Figures 2 and 5).  It successfully intersected 10.5m of strong uranium mineralization at the sub-Athabasca unconformity from 317.5 to 328.0m that averages 11.7% U3O8 (Figures 2 and 4).  The intersection includes a 3.0m subinterval of very strong uranium mineralization that averages 40.4% U3O8 from 324.5 to 327.5m.  Within the very high-grade section is a subinterval of off-scale (>65K CPS on an RS-125 handheld spectrometer) mineralization that averages 62.7% U3O8 over 0.5m from 326.0 to 326.5m.  Figure 6 is a core photo of the mineralized interval.


Next Steps


All assays from the 2020 winter drilling program at the Hurricane zone have now been received.  Data compilation and interpretation of the drilling results are well underway, as is planning for a summer drilling program that will continue to define the extent of the Hurricane zone.  The timing and amount of summer drilling may be impacted by the COVID-19 pandemic. The Company continues to monitor the situation will make decisions regarding future work programs in due course.


The Larocque East Property and the Hurricane Zone


The 100% owned Larocque East property consists of 20 mineral claims totaling 8,371 ha that are 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 km northwest of Orano Canada’s McClean Lake uranium mine and mill. 


Along with other target areas, 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 Cameco Corp. and Orano Canada Inc.’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 and an additional 14 drill holes to date in 2020.  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 intersection to date is 33.9% U3O8 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.  Importantly, the sandstone cover on the Property is thin, ranging between 140m and 330m in previous drilling. 


Table 1 – 2020 Hurricane Zone Results



Hole-ID From (m) To (m) Length (m) Radioactivity1,2 Chemical Assays Orientation Location
        (CPS) U3O8 (%) Ni (%) (Azm/Dip)  
LE20-303 330.0 335.5 5.5 >500 7.1 0.9 180/-80 Section 4460E
incl. 331.0 331.5 0.5 >10,000 3.4 0.1  
and incl. 332.0 333.5 1.5 >20,000 24.0 2.7  
LE20-32A3 329.5 338.0 8.5 >500 19.6 1.1 180/-80 Section 4510E
incl. 334.5 337.0 2.5 >20,000 63.6 0.4  
incl. 335.0 336.5 1.5 Off-scale5 76.7 0.3  
LE20-343 326.0 334.5 8.5 >500 33.9 0.5 180/-80 Section 4435E
incl. 328.0 333.0 5.0 >20,000 57.1 0.7  
incl. 329.5 331.5 2.0 Off-scale5 62.8 0.4  
LE20-363 332.5 333.5 1.0 >500 3.7 1.0 180/-80 Section 4460E
incl. 332.5 333.0 0.5 >20,000 5.5 1.3  
LE20-383 319.5 327.0 7.5 >500 2.0 0.2 000/-90 Section 4460E
incl. 325.0 325.5 0.5 >20,000 3.5 0.0  
and incl. 326.0 326.5 0.5 >20,000 9.8 0.1  
LE20-403 319.5 320.5 1.0 >500 0.1 0.1 000/-90 Section 4435E
and 322.5 326.5 4.0 >500 20.5 1.0  
incl. 323.0 324.5 1.5 >20,000 53.8 2.3  
incl. 323.0 323.5 0.5 Off-scale5 64.9 0.2  
LE20-423 326.0 329.0 3.0 >500 0.4 0.2 000/-90 Section 4410E
LE20-443 325.5 326.0 0.5 >500 0.2 0.0 000/-90 Section 4460E
and 327.5 329.0 1.5 >500 0.3 0.6    
LE20-463 318.0 328.0 10.0 >500 3.6 1.4 000/-90 Section 4485E
incl. 323.0 325.0 2.0 >20,000 12.8 1.6  
and 326.0 327.0 1.0 >10,000 4.5 4.9  
LE20-483 316.0 327.5 11.5 >500 1.3 0.3 000/-90 Section 4485E
incl. 321.0 321.5 0.5 >10,000 3.6 1.2    
and incl. 324.0 327.0 3.0 >10,000 3.3 0.2    
incl. 324.5 325.0 0.5 >20,000 5.1 0.2    
LE20-493 320.5 329.5 9.0 >500 1.1 0.1 000/-90 Section 4510E
incl. 326.5 327.5 1.0 >10,000 3.4 0.0  
LE20-513 322.5 330.0 7.5 >500 14.5 3.5 000/-90 Section 4510E
incl. 325.5 329.0 3.5 >10,000 30.9 7.1  
Incl. 326.0 329.0 3.0 >20,000 35.2 8.2  
LE20-524 318.5 326.0 7.5 >500 22.7 0.4 000/-90 Section 4435E
incl. 322.5 325.0 2.5 >10,000 67.2 0.7    
incl. 322.5 324.0 1.5 Off-scale5 79.9 0.5    
LE20-534 317.5 328.0 10.5 >500 11.7 0.3 000/-90 Section 4410E
incl. 324.5 327.5 3.0 >20,000 40.4 0.8    
incl. 326.0 326.5 0.5 Off-scale5 62.7 0.3    
Notes: 1.  Radioactivity is total gamma from drill core measured 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



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 NI 43-101 – Standards of Disclosure for Mineral Projects).  Mr. Carmichael has verified the data disclosed.  All radioactivity measurements reported herein are total gamma from an RS-125 hand-held spectrometer.  As mineralized drill holes at the Hurricane zone are oriented very steeply (-80 to -90 degrees) into a zone of mineralization that is interpreted to be horizontal, the true thickness of the intersections is expected to be greater than or equal to 90% of the core lengths.  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.  All chemical analyses are completed for the Company by SRC Geoanalytical Laboratories in Saskatoon, SK.  For additional information regarding the Company’s Larocque East Project, including its quality assurance and quality control procedures, please see the Technical Report dated effective May 15, 2019 on the Company’s profile at


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.  The Company recently discovered the high-grade Hurricane Zone of uranium mineralization on its 100% owned Larocque East property in the Eastern Athabasca Basin.  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.  


Figure 1 – Larocque East Property Map (CNW Group/IsoEnergy Ltd.)


Figure 2 – Western Hurricane Zone Drill Hole Location Map (CNW Group/IsoEnergy Ltd.)


Figure 3 – Cross Section 4435E (Drill Hole LE20-52) (CNW Group/IsoEnergy Ltd.)


Figure 4 – Drill Hole LE20-52 Core Photo of Mineralization (CNW Group/IsoEnergy Ltd.)


Figure 5 – Cross Section 4410E (Drill Hole LE20-53) (CNW Group/IsoEnergy Ltd.)


Figure 6 – Drill Hole LE20-53 Core Photo of Mineralization (CNW Group/IsoEnergy Ltd.)


Posted April 15, 2020

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