Toronto Geological Discussion Group
Andrew Carmichael, P.Geo, Senior Geologist, and Steve Blower, P.Geo., Vice President of Exploration, IsoEnergy Ltd.
Located along the fertile Larocque conductor trend, IsoEnergy’s Hurricane zone is a new discovery of high-grade unconformity-related uranium mineralization in the northeastern Athabasca Basin of Saskatchewan. The Hurricane zone was discovered with IsoEnergy’s first drill hole (8.5m @ 1.3% U3O8 in drill hole LE18-01A) on the Larocque East property, just 10 weeks after the property was acquired.
Located 320m below surface, mineralization is polymetallic (U, Ni and Co) and straddles the sub-Athabasca unconformity or is perched in the sandstone immediately above it. Anomalous concentrations of uranium and uranium pathfinder elements have been intersected throughout the sandstone pile in several drill holes. Similar to many Athabasca uranium deposits, mineralization is strongly structurally controlled and is spatially related to the intersection of graphitic fault zones with the unconformity. At Hurricane, brittle reactivation of east-west oriented fault zones has created a subtle ridge in the basement, the top of which is the preferred location for uranium mineralization. A total of 53 drill holes have now been completed by IsoEnergy in the general vicinity of the Hurricane zone which has grown to at least 575m long, up to 40m across, and up to 11m thick. The best intersection to date is 8.5m @ 34% U3O8 in drill hole LE20-34, including 5.0m @ 57% U3O8.
The target for the discovery drill hole was the unconformity beneath a zone of sandstone alteration and elevated uranium geochemistry in historical drill hole KER-12, located immediately east of the western property boundary along the Larocque conductor trend. The trend hosts significant uranium mineralization at the Larocque Lake zone and the Larocque North zone, both of which are located on the neighboring property to the west. Although several features contributed to the top tier ranking of the target, its location along the Larocque trend, proximal to weak uranium mineralization in several drill holes was paramount.
The Larocque East property encompasses approximately 15 km of the Larocque conductor trend, of which the western half is characterized by highly illitic sandstones above strong basement conductors that are only sparsely drilled.
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