lineament analysis and computer simulation analysis were carried out in order to understand the fracture systems around the Hishikari mine and the mechanism of the gold-quartz vein systems.
Pull-apart structure, fault gauge and drag fold, which are ovserbed in the quartz veins, indicate uplift of the basement(NAITO, 1993). Lineaments are divided into four directions, NW, NE, EW and NS directions, and four ring shaped lineaments are extracted by aerial photographic interpretation. The Hishikari mine is located in the central part of ring shaped lineaments. The distribution of ring shaped lineaments coincides with the basement structure estimated from gravity anomaly. It was understood that the ring shaped lineaments indicate the tectonic uplift of the Cretaceous basement, from the results of computer simulation analysis (Vertical Basement Displacement Method).
It is resulted that the fracture analysis provides the practical information about the buried vein systems in prospecting for epithermal gold deposits.
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