Airborne magnetic and radiometric survey, Idaho Cobalt Belt, Central Idaho, 2021; Radiometric Data

This publication provides digital flight line data for a high resolution magnetic and radiometric survey over an area of central Idaho, USA. The survey includes airborne geophysical data collected as part of the U.S. Geological Survey (USGS) Earth Mapping Resource Initiative (Earth MRI) effort (Day, 2019). Earth MRI is a cooperative effort between the USGS, the Association of American State Geologists, and other federal, state, and private sector organizations to improve our knowledge of the geologic framework of the United States. Data for this survey were collected by Sander Geophysics Ltd. under contract with the USGS using a rotary wing aircraft with a magnetometer mounted in the forward stinger and a fully calibrated gamma ray spectrometer. The survey operated out of the Salmon Idaho airport from September of 2021 to October of 2021. The survey covers an approximately 65 kilometer by 90 kilometer area centered on the igneous complex underlying the Salmon Challis National Forest. Data were collected along east west flight lines spaced 200 meters apart with north south tie lines flown every 2,000 meters. A mean terrain clearance of 200 meters was maintained except where safety dictated a higher elevation. A total of 16,950 line kilometers of data were collected. Files that are available in this publication include flight line data for the magnetic survey, flight line data for the radiometric survey and a report describing the survey parameters, field operations, quality control and data reduction procedures.