Passive AirborneEM and Magnetic Survey Results over SEDEX Lead-Zinc Deposits at Howard's Pass in Selwyn Basin,Yukon

摘要

In 2008 Geotech flew a regional scale 24,675 line-km survey covering a 25,000 km~2 area (1 km line spacing) in the Selwyn Basin. The survey footprint straddles eastcentral Yukon and overlaps into the weatern Northwest Territories. In march 2013 Yukon Geological Survey purchased the survey data, and in November 2013, released the data publicly. The Selwyn Basin area is prospective for SEDEX-style Pb-Zn-Ag mineralization and the ZTEM survey data provide insights into regional structures and plutons in the region. The Selwyn Project at Howard's Pass occupies a ~10x50km region at the southeastern edge of the Selwyn Basin survey area and hosts a ~250 million tonne resource with ~4.5% Zn and ~1.5% Pb that occurs along a 38km long mineralized SEDEX deposit horizon. This case-study presents the regional AEM and magnetic survey results but focuses on the Howard's Pass SEDEX region, supported by 2D and 3D inversions.