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Ministry of Energy Mines and Responsible for Core Review

The MapPlace - Endako Geophysics

(BCMEM OF 2005-11 /GSC OF 3534)

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Details: Endako Geophysics covers the 1997 Endako area survey and is available as Geological Survey of Canada Open File 3534 for downloads.  This survey was published to MapPlace on April 8, 2005. The MapPlace data includes digital gridded images for 2 magnetic and 7 radiometric parameters for each survey area. The downloadable files from this website are in georeferenced TIF – tagged image and PNG formats (UTM NAD 83 and Albers projections) and GRD - Geosoft gridded data format (UTM NAD 83 only). PDF theme files are also available.

View Endako Geophysics Map


Go to Endako Geophysics Map

 

Survey Summary:

ENDAKO GEOPHYSICAL SURVEY
BCMEM Open File 2005-11 / GSC Open File 3534

Airborne geophysical survey, Endako, British Columbia
(Parts of NTS 93F/15NW; 93K/02W; 93K/03E)
Geological Survey of Canada; 9 maps

 

Analogue and digital products include data for seven radiometric and two magnetic parameters:

 

Map Layer Themes Endako
PDF Themes Files
see Note 1
MTF - Magnetic total field (nT)  
CVG - Calculated magnetic vertical gradient (computed, nT/m)  
POT - Potassium (K, %)  
URA - equivalent Uranium (eU, ppm)  
THO - equivalent Thorium (eTh, ppm)  
ADRN - Natural air absorbed dose rate (ADRN, nGy/h)  
RUT - equivalent Uranium/equivalent Thorium (eU/eTh)  
RUK - equivalent Uranium/Potassium (eU/K, ppm/%)  
RTK - equivalent Thorium/Potassium (eTh/K, ppm/%)  
1:250K Scale Geology, Mineral Occurrences & Titles  
All Themes in one file (11 by 17 images)  
File Downloads Zip Files
Georeferenced TIFF files (UTM Zone 10 NAD 83) E_tif_Z10.zip (3.6MB)
Georeferenced TIFF files (Albers NAD 83) E_tif_AL.zip (3.6MB)
Georeferenced PNG files (UTM Zone 10 NAD 83) E_png_Z10.zip (1.8MB)
Georeferenced PNG files (Albers NAD 83) E_png_AL.zip (1.9MB)
Original GSC SurView data files for viewing and printing only (.gri & .grx) E_gri.zip (10.9MB)
Original GSC Geosoft gridded data format (.grd) E_grid.zip  (12.5MB)

Note 1: The PDF maps were created from MapPlace using the Rasterize print job option to eliminate the black background. The TIF and PNG download images include the geophysical information without topographic base information.

Legend:

K - potassium, i.e. K40 (units: %)
eU - equivalent uranium concentration by weight (the spectrometer directly measures Bi214, that is an indirect measure of uranium) (units: ppm)
eTh - equivalent thorium concentration by weight (the spectrometer directly measures Tl208, that is an indirect measure of thorium) (units: ppm)
Total Count - all counts from 400 to 3000 keV. (units: cps or uR/h)
Natural Exposure - computed from K (%), eU (ppm), eTh (ppm) concentrations:
Exposure = 1.505 K + 0.625 eU + 0.31 eTh (uR/h)
(Grasty et al, 1984) 'Exposure' is different from the traditional 'Total Count', in that it excludes radiation from man-made contaminants.
Natural Air Absorbed Dose Rate - computed from K (%), eU (ppm), eTh (ppm) concentrations:
Absorbed Dose Rate = 13.08 K + 5.43 eU + 2.69 eTh (nGy/h) 'Natural Air Absorbed Dose Rate' is different from the traditional 'Total Count', in that it excludes radiation from man-made contaminants.
eU/eTh, eU/K, eTh/K - ratios of K, eU, eTh that are useful for interpretation

Units:

nT - unit of magnetic total field (nano Tesla)
ppm - unit of concentration by weight (part per million), used for eU (uranium) and eTh (thorium)
% - for potassium (K40): unit of concentration by weight
Ur - unit of radioelement concentration by weight
(1 Ur is defined as the total count rate from 1 ppm uranium in equilibrium)
µR/h - unit of Exposure (micro Roentgen/hour)
nGy/h - unit of Natural Air Absorbed Dose Rate (nano Gray/hour)