A high sensitivity fixed-wing magnetic airborne survey was carried out for U.S. Geological Survey (Client) from Skwentna Roadhouse, AK, USA, over the survey blocks known as: Sustina (A1), and Add-On. New-Sense Geophysics Ltd. (NSG) flew the survey under the terms of an agreement with Client dated September 7th, 2012. The survey was flown between October 11th and November 1st, 2012. A total of 10,827* line kilometers of field magnetic data were flown, collected, processed and plotted. Sustina (A1) Block: 7,700 km; Add-On Block: 3,127 km. The primary geophysical sensor was a high-sensitivity Cesium-3 magnetometer, mounted in a fixed tail stinger assembly. Airborne ancillary equipment included; iCAM (digital video recorder), iDAS data acquisition system, fluxgate magnetometer, radar altimeter, and global positioning system (GPS) receiver. The GPS system provided accurate real-time navigation and subsequent flight path recovery. Ground equipment included; high-sensitivity Cesium-3 magnetometer, iBASE data acquisition system, global positioning system (GPS) receiver, and PC-based field workstation. The GPS receiver was used for time synchronization with airborne data. The field computer was used to check the data quality and completeness on a daily basis.