The ZTEM system is considered ideal for furthering the exploration of the Stewardson Lake project where the underlying basement is locally overlain by low resistivity Athabasca Group sediments and unconformity depths range from an estimated 900 m in the south to greater than 1100 m in the north. The key features of the ZTEM system that will provide high quality data collection over the Stewardson Lake project, are 1) its high spatial resolution (8 to 10 meters), 2) excellent resistivity discrimination for detection of conductive anomalies, and 3) low frequency penetration (as low as 30 Hz) through the conductive Athabasca sediments, resulting in depth resolution to >1500 meters..
Following the completion of the ZTEM survey, follow-up ground EM survey(s) and infill surface geochemistry over prospective areas are anticipated. This work will focus on key EM geophysical targets that are supported by anomalous surface geochemical signatures.
A multifaceted surface geochemical sampling program (1663 sample sites at about 500 meter spacing) over the Stewardson Lake project area was completed by Uravan in July 20112 and identified several anomalous zones The program consisted of collecting Bor C-horizon soil samples, along with vegetation and tree core samples from black spruce and jack pine trees3 . The southwest and south-central portion of the Stewardson Lake property is highlighted by correlations of low radiogenic lead (Pb) isotope values ( 207Pb/206Pb ratios) between clay and tree core samples that are preferentially distributed in proximity to interpreted structural trends. The airborne ZTEM survey could potentially highlight conductive features that are supported by anomalous surface geochemical trends thereby refining future drill targets.
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