NTGO Minerals - Snowbird Aeromagnetic Survey

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Snowbird Aeromagnetic Survey (Project Leader: Beth Fischer)

NWT Open File 2004-04
Aeromagnetic Survey of the Snowbird-Wholdaia Lakes Area
Northwest Territories, 065D, 075A (East half)

Click here to view an order form (to download in Internet Explorer: right click the link and choose "save target as"). Once you've completed the form, email your request to ntgo@gov.nt.ca. If you need assistance with your order please call 867-669-2636.

Or go directly to the Gateway Reference Browser to choose which files to download. Under NTGO Publications, select NWT Open Files.

During the winter of 2003-04, the Northwest Territories Geoscience Office (NTGO) flew an airborne magnetic survey over the southeastern corner of the NWT, covering NTS sheets 065D and 075A (East half), between -102 and -105 degrees west, and 60 and 61 degrees north. The survey was initiated following a brief reconnaissance of the area during the summer of 2003, and was followed by a mapping project in the summer of 2004.

The survey was drape-flown on northwest trending lines at 400 m spacing, at a nominal height of 150 m. Tie lines were flown at 2400 m spacing. Specifications were established by the Geological Survey of Canada, who also provided quality control checks and technical expertise as a contribution to the Western Churchill Metallogeny Project. NTGO (formerly the CS Lord Northern Geoscience Centre) administered the contract, managed the project, and provided additional processing quality control.

Industry assistance enabled us to acquire horizontal gradient data, which is included in the final digital line archive. The measured lateral gradient was used during calculation of the total field grid to improve accuracy and continuity of the gridded data between lines. This gradient enhanced, total field grid was used to produce first vertical derivative and apparent magnetic susceptibility grids. The east and north components of the measured horizontal gradient were used to calculate an anomalous total field by integration.

The final product was published under the NWT Open File series, number 2004-04. It includes maps at 1:100,000 and 1:250,000 scale of gradient enhanced, gridded, contoured total magnetic field and its first vertical derivative, and maps at 1:100,00 scale of apparent magnetic susceptibility and anomalous total field, available on paper and as PDF or postscript files. The final digital line archive contains leveled total magnetic field, leveled north and east components of the horizontal gradient, location data in geographic and NAD83 UTM coordinates, and calculated topographic elevation data derived from GPS altitude and radar altimeter. Six types of digital grid are provided in Geosoft and grid exchange (gxf) formats: total magnetic field, gradient enhanced total magnetic field, first vertical derivative of the enhanced total field, apparent magnetic susceptibility, anomalous total field integrated from horizontal gradients, and calculated topographic elevation (DEM). Geotiffs of the grids can be requested as well.