Ministry of Mines
Publication: GDS1089
Title: Ontario Airborne Geophysical Surveys, Magnetic and Electromagnetic Data, Grid and Profile Data (ASCII and Geosoft® Formats) and Vector Data, Saganash Lake Area
Publication Year: 2021
Type: Digital data
Author(s): Ontario Geological Survey
Series: Geophysical Data Set
Type: Digital data
Price: $25.00
NTS Number: 42B, 42G
Abstract: Geophysical Data Set (GDS) 1089 includes the results of an airborne magnetic and electromagnetic survey, totalling 4848 line-kilometres, flown over the Saganash Lake area of northeastern Ontario, and covers an area of approximately 826 square kilometres. The survey was flown by Geotech Limited (Aurora, Ontario).
This geophysical data set includes 1) airborne magnetic and electromagnetic profile data—both raw and processed—in ASCII (.xyz) and Geosoft® (.gdb) file formats; 2) 40 m × 40 m grids (in ASCII (.gxf) and Geosoft® (.grd) file formats) of the magnetic and electromagnetic profile data and derivatives; 3) database of picked electromagnetic anomalies in ASCII (.csv) and Geosoft® (.gdb) file formats; 4) database of Keating correlation coefficient anomalies in ASCII (.csv) and Geosoft® (.gdb) file formats; 5) GeoTIFF (.tif) images of magnetic and electromagnetic grids; 6) vector (.dxf) files of flight path, EM anomalies, Keating correlation coefficient anomalies, contours of the residual magnetic field, EM decay constant and apparent conductivity; and 7) the survey report in portable document format (.pdf).
Survey Parameters:
Survey type: magnetic and electromagnetic
Dates flown: January 26 to March 19, 2021
Survey conducted by: Geotech Limited, Aurora, Ontario
Survey size: 4848 line-kilometres
Survey area: 826 square kilometres
Traverse-line direction: 125°–305°
Traverse-line spacing: 200 m
Control-line direction: 35°–215°
Control-line spacing: 1500 m
Aircraft nominal terrain clearance: 93 m
Magnetic survey type: single sensor total field
Magnetic sampling interval: 10 readings per second
EM survey type: VTEM® Plus
EM domain: TDEM
EM height: 42 m
VLF-EM: N/A
Gamma-ray survey: N/A
These data accompany geophysical Maps 83026 to 83037; all maps are available separately from the digital data set.
Purpose: Airborne geophysics is an integral part and core function of the Ontario Geological Survey’s (OGS) geoscience activities. This magnetic and electromagnetic survey was carried out as part of the Ontario Geological Survey’s Precambrian bedrock mapping program provide high-quality and high-resolution geophysical data to assist in mapping the bedrock geology of the area.
Keywords: Airborne Magnetic (Residual):Airborne Magnetic (Total):Geophysical:Geophysics, General:High Resolution Total Field Magnetics:Residual Magnetic Field:Residual Total Magnetic Field:Apparent Conductance:Apparent Conductivity:Electromagnetic (EM) Decay Constant:Electromagnetic (EM) Anomalies:Keating Correlation Coefficients:Magnetic and Electromagnetic (EM) Data
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