The Drilling Practice in the Geothermal Area of the Northern Kurikoma District

Abstract

The Kurikoma district is located in the volcanic region of the northeastern part of Japan, and is well known as a hot-spring area.
The Dowa Mining Co., Ltd. organized exploration team for the geothermal area in 1972, and geological and geophysical works were made and also five drill holes were sunk up to the end of 1974. The drilling techniques adopted for this area are described in this paper in comparison with ordinary techniques for the exploration of mineral deposits.