Airborne Survey Specifications

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Airborne Survey Specifications

As detailed specifications are provided in Open File 2817, only factors pertinent to data interpretation or application are summarized below.

The airborne survey was flown to international standards established by the Radiation Geophysics Section, Geological Survey of Canada, ensuring collection of high quality, properly calibrated data. Gamma ray spectrometric measurements were made using an Exploranium GR820 spectrometer with ten 102 x 102 x 406 mm NaI(Tl) crystals (33.8 litres downward, 8.5 litres upward). Gamma ray spectra were recorded at one second intervals at a mean terrain clearance of 120 m, an air speed of 120 km/h, along NE-SW oriented flight lines spaced at 500 m intervals . With this configuration, each measurement corresponds to a ground area of approximately 50 along track by 100 m across track, with overlapping, consecutive1 second readings every 35 m along the ground. This resolution is maintained on the stacked profile presentations, but gridding required to generate the colour interval maps requires interpolation to 120 m.

Magnetic total field (MTF) measurements were made using a Scintrex cesium vapour magnetic sensor in a bird towed 30 m below the helicopter. Half second readings were corrected for diurnal variations and the International Geomagnetic Reference Field (IGRF) was removed (hence the magnetic data displayed is referred to as “residual”). Flown control lines were used to level the data, which was then interpolated to a 100 m grid using a minimum curvature algorithm. The magnetic vertical gradient (MVG) was calculated from the magnetic total intensity grid.

VLF total field and quadrature components for two stations were recorded using a Hertz Totem 2A system. The line station was tuned to 24.0 kHz , from station NAA at Cutler, Maine, and the ortho station was tuned to 24.8 kHz from NLK at Seattle, Washington. As the VLF data was collected on a secondary “as-is” basis, no effort was taken to ensure complete coverage. A long wavelength interference signal is evident in the data, and extreme caution must be exercised in any interpretation of the VLF data. For this reason, the VLF data has not shown particular relevance to known mineralization and it is not considered in this report. (Contact the author if additional information is required).