Farewell Geophysical Survey

The digital data below was produced from airborne geophysical surveys conducted in 2012 and 2013 for the Farewell survey area in the McGrath and Yentna mining districts, McGrath and Lime Hills quadrangles, south-central Alaska. Aeromagnetic, electromagnetic (EM), and radiometric data were acquired by helicopter for about 954 sq miles, which includes the 100 sq mile Dalzell Creek area previously released. This publication incorporates data from the previously published Dalzell Creek area into the linedata, grids, maps, and other derivative pieces of this publication. CGG's frequency-domain DIGHEM V system was used for the EM data. The dataset includes (1) raw and processed linedata; (2) gridded, Google Earth, and GeoTIFF formats of the calculated linedata; (3) maps of the data; and (4) vector files of data contours and flight lines.

Available Data Metadata Overview
File Name Data File Format Download File Size
farewell-middle-styx-vectors Vector data Download 604.3 M
gpr2014-2_vectors-DXF Vector data Download 420.5 M
gpr2014-2_vectors-SHP Shapefile Download 326.4 M
farewell-middle-styx-maps-hpgl2 Plot files Download 242.0 M
farewell-middle-styx-sm-profiles Plot files Download 1.2 G
gpr2014-2_maps-HPGL2_01A-13D Plot files Download 587.6 M
gpr2014-2_maps-HPGL2_14A-29D Plot files Download 684.3 M
gpr2014-2_EMandMAG_linedata-XYZ Line data XYZ files Download 394.6 M
gpr2014-2_rad_linedata-XYZ Line data XYZ files Download 123.4 M
gpr2014-2_EMandMAG_linedata-GDB Line data GDB files Download 716.5 M
gpr2014-2_rad_linedata-GDB Line data GDB files Download 531.0 M
gpr2014-2_grids-GRD Gridded data Geosoft format Download 302.5 M
gpr2014-2_grids-ERS Gridded data ER Mapper Download 302.5 M
farewell-middle-styx-geotiffs-kmzs Google Earth files Download 137.4 M
gpr2014-2_kmz Google Earth files Download 427.1 M
gpr2014-2_geotiffs Georeferenced raster files Download 212.4 M
farewell-middle-styx-maps-pdf Adobe PDF files Download 248.9 M
farewell-middle-styx-report-em Adobe PDF files Download 13.8 M
gpr2014-2_maps-PDF_01A-13D Adobe PDF files Download 887.6 M
gpr2014-2_maps-PDF_14A-21D Adobe PDF files Download 498.0 M
gpr2014-2_maps-PDF_22A-29D Adobe PDF files Download 549.4 M


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  • 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.
  • GPR 2014-2. Farewell survey area: Airborne magnetic, electromagnetic and radiometric data in line (point), grid, vector, and map formats, McGrath and Lime Hills quadrangles, south-central Alaska.