Tofty airborne magnetic and radiometric survey, Alaska, Geophysical Report 2025-4, covers an area within the Tanana Quadrangle west of Fairbanks, Alaska. Magnetic and radiometric data were collected with a helicopter between August 25, 2024, and August 30, 2024, by EON Geosciences Inc. The survey contains a single block covering 298 km2. A total of 2,231.3 line-kilometers were collected. The magnetometer was installed inside the stinger attached to the helicopter nose. The airborne gamma-ray spectrometer was mounted on the interior floor of the helicopter cabin. The block was flown with a line spacing of 200 m, except for the northeastern portion of the block that was flown with a 100 m spacing. The nominal height of the survey was 134 m. Tie-lines for magnetic leveling were flown at 1,200 m spacing.
| File Name | Data File Format | File Size | Info |
|---|---|---|---|
| Download gpr2025_4v2-tofty-vector_data | Vector data | 190.8 K | Read me |
| Download gpr2025_4v2-tofty-grids_tif | Image files | 18.8 K | Read me |
| Download gpr2025_4v2-tofty-grids_geosoft | Gridded data Geosoft format | 14.1 M | Read me |
| Download gpr2025_4v2-tofty-kmz | Google Earth files | 26.6 M | Read me |
| Download gpr2025_4v2-tofty-databases_geosoft | Database files | 290.2 M | Read me |
| Download gpr2025_4v2-tofty-ascii_data | ASCII tabular files | 126.8 M | Read me |
| Download gpr2025_4v2-tofty-documents | Adobe PDF files | 2.6 M | Read me |
| Download gpr2025_4v2-tofty-maps_pdf_format | Adobe PDF files | 45.2 M | Read me |
