Middle Styx Geophysical Survey

The Middle Styx geophysical survey is located about 150 kilometers northwest of Anchorage, Alaska in the upper South Fork of the Kuskokwim River drainage and south of Rainy Pass in south-central Alaska. The survey is in or near the Yentna, Redoubt, and McGrath mining districts. Frequency domain electromagnetic, magnetic, and radiometric data were collected with the DIGHEMV system from September 12th to November 3rd, 2012 and June 29th to September 27th, 2013. A total of 1154.9 line kilometers were collected covering 406.38 square kilometers. Line spacing was 400 meters (m). Data were collected 30 m above the ground surface from a helicopter towed sensor platform ('bird') on a 30 m long line.

Publications

• GPR 2019-10. Middle Styx electromagnetic, magnetic, and radiometric airborne geophysical survey data compilation. Supersedes GPR 2013-2 and GPR 2014-4.
• GPR 2014-4. Farewell and Middle Styx survey areas: Project report, interpretation maps, EM anomalies, stacked multi-channel profiles, and other products of the airborne geophysical surveys, parts of the McGrath, Lime Hills, and Tyonek quadrangles, south-central Alaska. The data and maps for this publication were initially released as a compilation of two distinct geophysical surveys. The maps and digital data have subsequently been divided into the original acquisition areas: Farewell, GPR 2019-12 and Middle Styx, GPR 2019-10.
• GPR 2013-2. Middle Styx survey area: Airborne magnetic, electromagnetic, and radiometric data in line (point), grid, vector, and map formats, Lime Hills and Tyonek quadrangles, southcentral Alaska.