First vertical derivative of the magnetic field, McQuesten Aeromagnetic Survey, NTS 115P/5, 115O/8 and part of 115O/7, Yukon

Map of the first vertical derivative of the magnetic field derived from data acquired during an aeromagnetic survey carried out by Goldak Airborne Surveys from November 19, 2008 to February 19, 2009. The data were recorded using a split-beam cesium vapour magnetometer mounted in the tail boom of a Piper Navajo aircraft.