THORBURN LAKE
IsoEnergy holds a 100%-interest in the Thorburn Lake property located just 7 kilometers east of Cameco's Cigar Lake mine and 300 metres north of Cameco’s Thorburn Lake uranium occurrence.
Prior to IsoEnergy, previous owners completed only 14 drill holes on the Thorburn Lake property. Four were drilled in 2008 and identified uranium enrichment at the Athabasca Group-basement unconformity, with uranium analyses as high as 90 ppm over 5.1 metres. A follow-up program was completed in 2011. Of the ten holes drilled in 2011, four had significant uranium anomalies associated with alteration envelopes at the unconformity. Drill hole TBN-11-05a intersected visible pitchblende veins and disseminations. This drill hole yielded a best result of 3610 ppm U (0.43% U3O8) over 0.6 metres, in the basement directly below the sub-Athabasca unconformity. The interval occurs within a larger weakly mineralized zone with a grade of 0.019% U3O8 over 8.0 metres straddling the unconformity.
Thorburn Lake Geology, Drill Holes and Key Features
Uranium mineralization intersected in TBN-11-05a, Thorburn Lake Property
IsoEnergy completed a total of 7,100 metres of drilling in 16 drill holes at Thorburn Lake in two programs in 2016 and 2017. The focus of the programs was to evaluate extensions of the uranium mineralization intersected in 2011, especially along-strike to the northeast beneath lake ice. Depth to the sub-Athabasca unconformity at Thorburn Lake ranges from 290 to 350 metres.
Drilling in 2016 and 2017 extended favourable structure and graphitic units to the northeast and continued to intersect sporadic uranium mineralization and alteration. Additional drilling in this area is warranted.
Additionally, a program of DC-resistivity surveying was completed in 2017 to extend coverage onto the relatively unexplored southwest half of the property. Future work on the Thorburn Lake property will include follow up drilling in the area of the 2016 and 2017 drilling campaigns, plus drilling of geophysical targets remaining from the 2016 and 2017 DC-resistivity surveys.
Exploration at Thorburn Lake is at a very early stage and the property is highly prospective for both unconformity and basement hosted uranium mineralization.
Drill Hole Locations at Thorburn Lake
The Cigar Lake mine haul road passes through the Thorburn Lake property. Total mineral reserves at Cigar Lake are 221.6 million lbs of U3O8 at 16.7% U3O8 (www.cameco.ca). The Thorburn Lake property also sits within 300 metres of the Thorburn Lake uranium occurrence where mineralized intersections including 3.2% U3O8 over 8.8 metres have been reported.
RADIO
IsoEnergy holds a 100%-interest in the Radio project in the eastern Athabasca Basin contiguous with Rio Tinto's Roughrider deposit (Rio Tinto bought Hathor Exploration in 2012 for C$654 million).
Before IsoEnergy, only one campaign of drilling had ever been completed on the Radio project. NexGen Energy drilled a total of nine holes (totaling 3,472.9 metres) during the summer of 2013 and identified clay alteration, structural disruption in the Athabasca sandstone and alteration and structures in the basement rocks. These features are known to occur at or in the vicinity of high-grade uranium mineralization in the Athabasca Basin.
Radio Property Regional Magnetics and Target Areas
IsoEnergy has completed 23 drill holes totaling 8,859 metres in two campaigns in 2016 and 2017. Drilling targeted three east-west oriented magnetic lows on the property, including the Roughrider corridor that extends onto Radio from Rio Tinto’s Roughrider deposit, 2km to the west.
The drilling successfully located a large zone of strong basement hosted clay alteration in the southern magnetic low corridor. The zone is similar to the alteration zone surrounding the Roughrider deposit and is associated with strongly graphitic structures and locally elevated uranium and uranium pathfinder geochemistry.
2Z
The 2Z project is located 30 kilometers southeast of Cigar Lake mine and 11 kilometers southeast of Sand Lake uranium deposit. The project consists of four mineral claims totaling 354 hectares. The vertical depth to the unconformity is 60 to 100 meters. The Wolf grid conductive trend extends onto the eastern part of 2Z.
CABLE
The Cable project is situated in the east-central portion of the Athabasca Basin. The project comprises ten contiguous claims and one non-contiguous claim covering 44,425 hectares with a vertical depth to the unconformity between 870 to 1,000 metres.
CARLSON CREEK
The Carlson Creek project is located 19 kilometres northeast of the McArthur River mine and five kilometres east of the Paul Bay, Ken-Pen, and Orora zones. Carlson Creek comprises one claim covering 759 hectares in the Key Lake – McArthur River – Cigar Lake corridor. The vertical depth to the unconformity is 410 to 460 metres.
COLLINS BAY EXTENSION
The Collins Bay Extension (CBX) project is located 10 km northeast of Eagle point mine, 17 km east of McClean Lake mine, and 20 km northeast of Rabbit Lake mine and mill. The project consists of 15 mineral claims totaling 9,337 hectares. Significant regional trends and structures extend onto the CBX property including the Collins Bay Fault and Collins Bay and Tent-Seal conductive trends. The project is proximal to the edge of the Athabasca Basin.
EAGLE
The Eagle project is located 47 kilometres west of McClean Lake mine and 37 kilometers southwest of Hurricane Zone. The project comprises one claim covering 5,887 hectares. The vertical depth to the unconformity intersected in neighboring drill holes is 530 to 675 metres.
EDGE
The Edge Project is located 19 kilometres northeast of the Hurricane zone and comprises 3 claims totaling 6,515 hectares. Drilling indicates the vertical depth to the unconformity is 40 metres.
FULL MOON
The Full Moon Project is located 18 kilometres north of the McClean Lake Mill, 14 kilometres east of the Hurricane zone, and comprises 17 claims totaling 11,107 hectares. Drilling indicates the vertical depth to the unconformity is 27 to 133 metres.
HORIZON
The Horizon project is located 30 kilometres northeast of the McClean Lake mine, 35 kilometers north of the Eagle point mine, and 45 kilometres north of the Rabbit Lake mine and mill. The project comprises three mineral claims totalling 15,748 hectares proximal to the eastern edge of the Athabasca Basin.
LAROCQUE WEST
The Larocque West project is located 5 kilometres west of the Larocque Lake Zone, 10 kilometres southwest the Hurricane zone, and 35 kilometres northwest of McClean Lake mine. The project consists of 6 mineral claims totalling 509 hectares. The vertical depth to the unconformity is 335 metres.
MADISON
The Madison Project is located 14 kilometres east from the Sand Lake uranium deposit (1.3 metres at 22% U3O8) and only 7 kilometres west of Highway 905. The Madison property has seen 11 historic drill holes by Eldorado, Denison, and Cameco, with only one occurring after 1989. Sandstone cover is very thin at only 60 metres. The property comprises one claim covering 1,347 hectares.
NORTH THORBURN
The North Thorburn project is located 13 kilometres east of the Cigar Lake mine, four kilometres south of the Natona Bay Pod, and 4 kilometres north of the Thorburn Lake deposit. North Thorburn comprises one claim covering 1,708 hectares which is transected by the Cigar Lake Road. The vertical depth to the unconformity is approximately 300 metres.
WHITEWATER
The Whitewater Project is located 32 kilometres northwest of Stony Rapids and 15 kilometres northeast of the Athabasca Basin. The property comprises 5 claims totalling 7,833 hectares and covering 11 km of the Grease River Shear.
WHITEWATER EAST
The Whitewater East Project is located 29 kilometres northwest of Stony Rapids, 20 kilometres north of the Athabasca Basin, and 11 kilometres east of IsoEnergy’s Whitewater property. Whitewater East is one claim of 1,147 hectares within the Tantato Domain and is adjacent to the Grease River Shear.
