Geological Survey of Norway (NGU)
Geological Survey of Norway (NGU) is a governmental agency under the Ministry of Trade, Industry and Fisheries (NFD), and the national institution for knowledge about Norway’s bedrock, mineral resources, superficial deposits and groundwater.
Geological, geophysical and geochemical mapping are essential in mineral exploration and tunneling planning. In 2010, the Norwegian Government provided extra funding to the Geological Survey of Norway (NGU) for mapping of mineral deposits in Northern Norway (MINN). Two years later, an extra funding for the same kind of program in Southern Norway was granted (MINS). An important task within these programs was to improve the quality of airborne geophysical data, and in this way give a better basis for mineral exploration and planning for underground constructions.
During the five following years, an extensive acquisition of high resolution geophysical data was performed, both from helicopters and from fixed-wing aircrafts. By the end of 2015, about 70 % of mainland Norway is covered with modern geophysical data. In almost all areas, magnetic and radiometric data were measured. In areas prospective for sulphide and graphite deposits, electromagnetic data in the frequency domain were collected. Based on processed data, compilations of total magnetic field and its derivates are produced, ground concentrations of potassium, uranium and thorium are calculated as well as apparent resistivity in the ground from 4 – 5 different frequencies.
Data are available as colored map images of the data as jpg-files, georeferenced tiff files and Geosoft XYZ-files, which can be downloaded free of charge from www.ngu.no
The data are used and will be used in the following activities:
• Bedrock and structural geological mapping
• Identification and evaluation of iron, sulphide and graphite deposits
• Indirect identification of other mineral deposits
• Tunnel planning and mapping of deep weathering
• Risk assessment through mapping and characterization of Quaternary clay deposits
• Reduce people’s radioactive exposure to radon and cesium
• Estimate heat production in the bedrock