Statistical Analysis of the Veins of the Kishu Mine

Abstract

This study on the vein-type mineralization in the Josen Honpi mining area, Kishu mine, involves statistical analyses and some genetic considerations derived from various results of the analyses and conventional geological data. The factors used for the analyses are strike, dip, width and grade of the veins. The statistical distribution charts obtained from these factors are given in figures on the Schmidt's net and frequency figures of the veins. These figures respectively show the vein structure and close relationship between the vein system and the geologic structure. Some situations of mineralization are calculated from the correlation between Cu% and S%, dip and strike, richness (grade × width of vein), width, etc.
The distribution graphs of Cu% and value of S/Cu show the position of copper bonanza and suggest ore shoot. The main current of copper-bearing solution passed through the E14 block at No.5 adit level and rose diagonally to the west and then went through the E12 block at No.3 adit level and reached No.2 adit level. In other words, it rose to the upper part in the D member (alternation of sandstone and shale) and then farther to the C member (medium-grained sandstone).One of the tributaries to the main current flowed into fissures at right angles to the synclinal axis of the country rocks in this area and formed the veins of the W1 block at No.2 adit level. Then, the tributary went down to the W1 block at No.3 adit level.