Open File NFLD/3383

Airborne Survey of the Twillick Brook Area

G.J. Kilfoil

St. John’s, Newfoundland, March, 2020

Open File NFLD/3383 comprises results from a recent high-resolution airborne magnetic gradiometer, radiometric and VLF-EM survey of the Twillick Brook area, south-central Newfoundland. This Open File consists of 13 maps for NTS map area 002D/04 and limited parts of surrounding map areas. Results are presented as full-colour maps in pdf format (1:75 000 scale).

Magnetic Maps

  • Map 2020-01  Residual Magnetic Intensity  (30 MB)
  • Map 2020-02  First Vertical Derivative of the Magnetic Field  (35 MB)

Radiometric Maps

  • Map 2020-03  Percent Potassium  (47 MB)
  • Map 2020-04  Equivalent Uranium  (50 MB)
  • Map 2020-05  Equivalent Thorium  (47 MB)
  • Map 2020-06  Ratio of Equivalent Thorium to Percent Potassium  (40 MB)
  • Map 2020-07  Ratio of Equivalent Uranium to Percent Potassium  (40 MB)
  • Map 2020-08  Ratio of Equivalent Uranium to Equivalent Thorium  (40 MB)
  • Map 2020-09  Natural Air Absorbed Dose Rate (45 MB)
  • Map 2020-10  Ternary Radioelement Image  (32 MB)

VLF-EM Maps

  • Map 2020-11  VLF-EM Total Field – 25.2 kHz (39 MB)
  • Map 2020-12  VLF-EM Total Field – 23.4 and 22.1 kHz (35 MB)
  • Map 2020-13  VLF-EM Quadrature – 25.2, 23.4 and 22.1 kHz (40 MB)

Additional data will be available from the Geological Survey Division’s online Geoscience Atlas: Metadata Link

  • Airborne survey profile data
  • Interpolated grids
  • GIS layers and map images
  • The contractor’s logistics and data processing report