The Larocque East property, home of the newly discovered Hurricane zone, consists of 20 mineral claims totaling 8,371 hectares. It was recently purchased in May, 2018 and subsequently expanded through staking. The unencumbered property is owned 100% by IsoEnergy. Larocque East is located 35 kilometres northwest of Orano Canada’s McClean Lake uranium mine and mill and is immediately adjacent to, but not quite contiguous with, the north end of IsoEnergy’s recently expanded Geiger property.
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 in several occurrences to the southwest of the Larocque East property. The closest of these 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 historic 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 0.8 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 is thin, ranging between 140 metres and 330 metres in previous drilling. A total of 23 historical drill holes have been completed on the property along approximately 22 kilometres of graphitic conductors. Five historical drill holes have intersected weak uranium mineralization on the Larocque East property to date, including drill holes KER-07 (0.12% U3O8 over 0.1 metre) and KER-11 (0.06% U3O8 over 0.5 metre) near the western property boundary, within the general vicinity of 2018 discovery drill hole LE18-01A.
Discovery (July 2018)
The Hurricane zone was discovered by drill hole LE18-01A, IsoEnergy’s first ever drill hole at Larocque East and the final drill hole of an 8-hole summer drilling program that included 7 drill holes at the Geiger property. Drill hole LE18-01A intersected a broad, 8.5-metre-long interval of elevated radioactivity averaging 1.26% U3O8 and includes a higher-grade subinterval of 3.58% U3O8 over 2.5 metres. Within the higher-grade subinterval is a zone of off-scale radioactivity (>15,000 cps on an SRAT SPP2 scintillometer (the “SPP2”)) that averages 6.45% U3O8 over 1.0 metre.
Winter 2019 Drilling
The first follow-up drilling program was completed in the winter (January to March) drilling season of 2019. The program was very successful with 11 of 12 drill holes intersecting significant uranium mineralization. Highlights include:
- LE19-02: 3.5m @ 10.4% U3O8,
- LE19-03: 3.0m @ 2.7% U3O8, 2.3% Ni,
- LE19-06: 4.0m @ 3.8% U3O8,
- LE19-09: 4.5m @ 4.2% U3O8, 1.1% Ni, 0.8% Co
- LE19-12: 8.5m @ 3.2% U3O8 and 2.1% Ni
Following the winter drilling campaign, the Hurricane zone was open for expansion on most sections, open along-strike in both directions, and measured 150 metres long, 40 metres across and up to 10 metres thick. Continued expansion drilling was clearly warranted.
Summer 2019 Drilling
Drilling resumed in the summer of 2019 with a 17 drill hole campaign designed primarily to evaluate the potential for expansion along-strike to the east of the winter drilling. This program was also successful, with the best intersection to date being obtained from drill hole LE19-16A (7.0m @ 5.4% U3O8, 0.7% Ni and 0.1% Co). Drill holes LE19-18 (3.0m @ 1.5% U3O8) and LE19-18C1 (5.0m @ 1.2% U3O8) successfully extended high-grade uranium mineralization 100 metres to the east.
This was followed by a large, 250m further step-out to the historical drill hole KER-07 section. Weak uranium mineralization in drill hole LE19-22 successfully extended the Hurricane zone footprint to 500 metres long. A 40 metre gap on-section between drill holes LE19-22 and KER-07 may contain significant uranium mineralization.
The next large step-out section 200m along-strike to the east was begun with drill hole LE19-26. This drill hole remains the only drill hole on the section. Intended to be a stratigraphic drill hole angled beneath the Hurricane zone target area, LE19-26 encountered a thick zone of sandstone alteration and structure characterized by elevated trace element geochemistry and radioactivity. All of this occurs well north of the expected trace of the Hurricane zone. The drill hole is located on the western edge of a prominent basement DC-resistivity low anomaly that extends to the east for several kilometres, likely indicating the presence of highly graphitic basement rocks – the preferred host for uranium deposits in the Athabasca basin.
Larocque East Property Map
Hurricane Zone Plan View
Discovery Cross Section
LE19-16A Uranium Mineralization Core Photo
Drill Hole LE19-26 Results
|Hole-ID||From (m)||To (m)||Length (m)||Radioactivity1,2 (CPS)||Chemical Assays||Location|
|U3O8 (%)||Ni (%)||Co (%)|
|LE19-053||No significantly elevated radioactivity||Section 4560E|
|LE19-153||No significantly elevated radioactivity||Section 4735E|
|LE19-173||No significantly elevated radioactivity||Section 4635E|
|LE19-193||No significantly elevated radioactivity||Section 4985E|
|LE19-203||No significantly elevated radioactivity||Section 4735E|
|LE19-213||No significantly elevated radioactivity||Section 4985E|
|LE19-243||No significantly elevated radioactivity||Section 4735E|
|LE19-263||No significantly elevated radioactivity||Section 5185E|
|LE19-27A3||No significantly elevated radioactivity||Section 4610E|
|Notes:||1. Radioactivity is total gamma from drill core measured with an RS-125 hand-held spectrometer.
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
5. Collared 59m down-hole in LE19-18