Description

This map of the first vertical derivative of the magnetic field was derived from data acquired during an aeromagnetic survey carried out by EON Geosciences Inc. during the period between April 12, 2010 to June 2, 2010. The data were recorded using a split-beam cesium vapour magnetometer (sensitivity = 0.005 nT) mounted in the tail boom of a Piper Navajo aircraft. The nominal traverse and control line spacings were, respectively, 800 m and 2 400 m, and the aircraft flew at a nominal terrain clearance of 250 m. Traverse lines were oriented N45°E with orthogonal control lines. The flight path was recovered following post-flight differential corrections to the raw Global Positioning System data and inspection of ground images recorded by a vertically-mounted video camera. The survey was flown on a pre-determined flight surface to minimize differences in magnetic values at the intersections of control and traverse lines. These differences were computer-analysed to obtain a mutually levelled set of flight-line magnetic data. The levelled values were then interpolated to a 200 m grid. The International Geomagnetic Reference Field (IGRF) was not removed from the magnetic field.

Resources

Name	Format	Description	Link
Yukon Geological Survey publication metadata	HTML		https://data.geology.gov.yk.ca/Reference/43177
Original metadata (https://open.yukon.ca)	HTML		https://open.yukon.ca/information/ef623255-6b4a-413c-b5d5-09c83c4d3302
Technical Report	PDF		https://ygsftp.gov.yk.ca/publications/openfile/2010/of2010-29-34/Little_Nahanni_Final_Survey_Report.pdf
Grid Data	ZIP		https://ygsftp.gov.yk.ca/publications/openfile/2010/of2010-29-34/Nahanni_grids.zip
Map	PDF		https://ygsftp.gov.yk.ca/publications/openfile/2010/of2010-30.pdf

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