Ore Deposits of the Kanagato Mine:With Special Reference to the Genesis of Deposits
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Small and large ore bodies, irregularly scattered in the fracture zone, are roughly grouped into southern, central and northern bodies, ore shoots of the former two having tendency to converge into a fan shape. In a longitudinal section of the zone, a remarkable zonal arrangement is noticed in regard to the minor contents of Co and Bi, and to the ratio of Cu to As. The nearer the granodiorite, that is situated to south and in the lower horizon, the larger the contents of Co and Bi and the ratio of Cu to As, as shown in Fig. 2 in the text.<BR>Stages of mineralization are : 1st, tourmaline-topaz-scheelite-bismuth minerals-arsenopyrite stage; 2nd, chalcopyrite-arsenopyrite-stage; 3rd, chalcopyrite-pyrite stage. These three stages are regarded as successive without intermission. Afterwards, longitudinal fault cut the pre-existing fracture zone filled with ore bodies, succeeded by formation of calcite veins as the 4th stage.<BR>An intimate relation Shipe between magma behavior and ore mineralization can be exemplified as follows : (a) Invasion of the granodiorite magma causing several shear fracture zones in the country rocks; (b) consolidation of outer cell of the magma, giving rise in intrusion of ore-mineralized solution into certain shear fractures ; (c) further consolidation of intrusives causing tensile faults cutting ore bodies ; and, (d) consolidation of deeper portion of the magma, mineralizing the outer cells of the intrusives.<BR>Zones of ore deposits have certain relations with the wall of intrusives in both Kanagato Mine and Taishu Mine of Tsushima Island, Kyushu. Inclination of the zone of ore deposits is roughly parallel to that of the wall of intrusives in both mines. In the Kanagato hypothermal deposits of Cu, 550-600 meters, and in the Taishu mesothermal deposit of lead and zinc, 1200-1500 meters from the wall belong to the mineralized zone. The top of the former mine and the bottom of the latter mine have the character similar to quartz vein with Cu and As.
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