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...Mineral exploration mining akhil kumar dwivedi assistant professor mlsu udaipur methods direct mapping drilling geochemical soil sampling stream geophysical techniques used for finding hydrocarbons coal and metals seismic reflection refraction gravity surveys magnetic survey using proton magnetometer electrical resistivity down hole logging there are main in an area is often the only way of being absolutely sure what underground will give a clue analysing samples noting depths at which rocks occur can help decide whether ore worth if exposed surface then them clear indication geology not on but also you may be able to work out cross section...