Geological Structure Modeling Around Mill Tailing Yard

Takano, Hitoshi*; Sugimoto, Yoshihiro*; Yamashita, Tadashi*; Yamada, Naoyuki*

Drilling and high resolution electrical survey was carried out to make a geological structure model around mill tailing yard. Following by drill investigation, Distribution of the granite which became fragility was confirmed by the development of fractures with hydrothermal vein. However, fresh bedrock is distributed deeper than 40m. Permeability of weathering granite is about in 1.1510m/sec. The value agrees previous findings. In fresh granite, permeability is 4.3310m/sec, and it value is larger than existing data. It is for developing of fractures in fresh granite. At high resolution electrical survey, analysis is done by 3 dimensions. By analyzing it with 3 dimensions, good resistivity distribution was provided. From resistivity distribution, tailing, weathered granite or sedimentary rock and fresh granite are classified. Resistivity distribution was taken out from lines or seismic exploration refraction method, and compared between two methods. As a result, low resistivity region is fitted low velocity zone and high resistivity region is fitted high velocity zone. Topography and 4 geological models are created. These models are output as versatile text data to show relation of a coordinate and the point of contact.