Geology and Ore Deposit of the Omine Mine, with Reference to the Status of Prospecting

概要

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The Omine Mine is located at about 20 km east of Tono City, Iwate Prefecture, or about 1.2 km northwest of the Sahinai iron ore deposit of the Kamaishi Mine.<BR>Geology of the mine area consists of Permian slate, sandy slate, sandstone and hornfels, intruded by quartz diorite and granodiorite.<BR>The genesis of the ore deposit is intimately related to the granodiorite intrusien. The deposit is a contact metasomatic-high temperature hydrothermal cupper ore deposit, and is characterized by abundant occurrence of cubanite along with chalcopyrite.<BR>The skarn of the ore deposit comprises four types, namely, "banded skarn", "breccia skarn", "green skarn" and "garnet skarn". The "breccia skarn" characteristically contains a large amount of microcline in its brecciated part, and the ore is found in the green-tinted interspace of the breccia. The ore, occurring in network or impregnation, or forming veinlets, has high contents of gold and silver.<BR>Prospecting is performed by geological survey, land survey and boring, keeping a close contact with the mining team. Recently the "underground wireline method" has been adopted to the boring work, by which the efficiency has been greatly raised.
資源地質学会の論文