Helicopter-borne magnetic, electromagnetic and radiometric geophysical survey in Raudsand area, Nesset municipality, Møre og Romsdal county

Abstract

NGU conducted an airborne geophysical survey in the Raudsand area in October 2016 on equest from the company Bergmesteren Raudsand AS. This report describes and documents the acquisition, processing and visualization of recorded datasets.The geophysical survey results reported herein are from approximately 700 line km, covering an area of 70 km2. he NGU modified Geotech Ltd. Hummingbird frequency domain EM system supplemented by optically pumped Cesium magnetometer and a 1024 channels RSX-5 spectrometer was used for data acquisition. The survey was flown with 100 m line spacing, line direction 160o (NNW to SSE) at an average speed 80 km\/h. The average terrain clearance of the EM bird was 47 m, and 75 meters for the spectrometer.