Environment

In February 2012 GNS, the Crown Research Institute responsible for geologic surveys, will report to the Northland Regional Council and the Far North District Council on findings of the recent geomagnetic survey of Northland.  The project has been jointly funded by the Government and the two councils.

The survey involved an aeroplane flying a low grid-pattern over the region measuring the magnetic signals emitted by the different rocks beneath the surface.  Whereas past geologic surveys have required geologist to make intelligent guesses as to which way rock strata dipped or lay between outcrops and bore log data, this survey removes that guesswork.  Knowing what the various layers are from the outcrops and bores, the survey data will enable their extent and depth to be mapped in 3D.

The data from the survey will enable accurate identification of potential mineral-bearing rocks, sources of rock for roading and building aggregate, possible groundwater aquifers, areas of crushed and unstable rock and clay, depth of soil for horticulture and agriculture, and the boundaries of these soil types.  This information will be of particular value to landowners and roading authorities, as well as to the minerals industry and local authorities.

Find background information about the Northland Airborne Geophysical Survey on the Far North District Council's website:

http://www.fndc.govt.nz/about-the-district/economic-development/northland-airborne-geophysical-survey