Geophysical (Ground and Airborne) : Geoelectric, GPR, Geomagnetic
A. Geophysic Survey
From wikipedia geophysics is a subject of natural science concerned with the physical processes and physical properties of the Earth and its surrounding space environment. It is the analysis of nature as it pertains to Earth, its environment, and its structure. Geophysical survey can be used for any purposes such as identification prospected area for mineral deposits, coal, oil and gas, underground surveys to identified-cable-pipe or other objects are buried and analysis of subsurface geological conditions. There are several geophysical survey methods we used to do that:
Subsurface survey using geoelectrical method, based on measurement of rock electricity. This method is used to determine type of minerals.
Subsurface survey using magnetic method, base on measurement of rock magnetism. Specially use to determine minerals that content iron, for example iron ore, and manganese.
3. Geo Penetrating Radar (GPR)
Geophysical survey that uses radar waves to detect objects or objects that are buried under the surface. This survey is suitable for detecting pipes, cables, construction buried. Depth achieved by this method can reach 7 meters below the ground surface.
B. Airborne Geophysic
Airborne Geophysical Survey is a survey in which data collection was taken by plane or helicopter. This survey was carried out very suitable for large areas and regional. The data were taken in the work we’ve ever done airborne magnetic data and radiometric is. The survey is usually to look at the potential of the existing mineral like iron ore, bauxite, nickel, gold and other minerals. However, this survey can also be performed to search for other commodities such as coal, oil and natural gas.