NTGO Information Update
Tuesday, August 4, 2009

The Northwest Territories Geoscience Office (NTGO), in conjunction with the Geological Survey of Canada (GSC), is pleased to announce the upcoming release of NWT Open File 2009-01:

Central Mackenzie Valley Airborne Gravity Survey, Northwest Territories

The survey will be released simultaneously by the NTGO and GSC on Friday August 7, 2009, at 11:00 am Mountain Standard Time. Survey maps, digital data, and related files will be available at that time through NTGO’s Gateway web portal. Simply click on the Gateway button at the NTGO website here, then click on Newest NTGO Publications to discover the Open File. A process that allows existing users to log-in and new users to set up a Gateway account will occur at the time of the download request. Gateway downloads are free of charge.

Project Description: A high-definition airborne gravity survey was conducted in the Norman Wells area by Sander Geophysics Limited between November 26 and December 19, 2008. The data were acquired with an AIRGrav gravimeter installed in an AStar helicopter. The nominal traverse line spacing was 2,000 m with control line spacings of 10 km. The nominal aircraft altitude was 150 m above ground. Leveled Bouguer anomalies along the flight lines were interpolated to a 400 m grid. The values of the Bouguer anomaly were calculated at a frequency of 2 Hz along the traverse, corresponding to a data spacing of approximately 20 m. The precision of the Bouguer anomaly is estimated at ±0.5 mGal. The total size of the survey was 7,868 line kilometers.

This survey is a joint open file publication by the NTGO and the GSC. It was administered by the GSC and by the NTGO through the Government of the Northwest Territories. Funding was provided by the Geo-mapping for Energy and Minerals (GEM) program of Natural Resources Canada and by the Strategic Investments in Northern Economic Development (SINED) program of Indian and Northern Affairs Canada.

PDF maps of the Bouguer anomaly and the first vertical derivative of the Bouguer anomaly will be provided at a scale of 1:250,000, along with PostScript files, Geosoft data files, and a contractor’s report. The same information will also be available from the GSC at http://gdr.nrcan.gc.ca/gravity.

Citation: Dumont, R., 2009. Geophysical series, NTS 96 E, 106 H and parts of 96 C, 96 D , 96 F, and 106 A, Norman Wells, Northwest Territories; Geological Survey of Canada, Open File 6154; Northwest Territories Geoscience Office, Open File 2009-01; scale 1:250 000.

About NTGO: The Northwest Territories Geoscience Office is a federal-territorial partnership between Indian and Northern Affairs Canada and the Department of Industry, Tourism and Investment. It advances geological knowledge of the Northwest Territories for the benefit of Northerners and all Canadians.

For a listing of our recently released publications, click here.