Abstract
A tracer migration test carried out around the KD-90 drift in the Kamaishi Mine, Japan was analyzed usingthe computer code “Don-Chan”. Geological structure developing in the rock mass near this drift was carefullystudied for making a 3-D channel network model. It was found that two major fracture sets are developing in therock mass and that the lineations observed on the fracture planes mainly develope in the perpendicular directionto the intersection line between these fracture sets. Those nature of the fracture system implies that these fracturessets were initially formed as the conjugate sets and the stress conditions acting on the rock mass have not somuch changed. A channel network was constructed on the basis of those features of the fracture system. Thetracer migration was fairly well analyzed by the “Don-Chan” code. The applicability of this code was also examined.
