Gold mineralization of the Akeshi Mine, Kagoshima Prefecture

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Authors:Nakamura, Kiyoshi; Yamanaka, Kazuhiko; Yamasaki, Tatsuo
Author Affiliations:Primary:
Mitsui-Kushikino Mining Company, Kagoshima, Japan
Mitsui Mining & Smelting Company, Japan
Volume Title:Shigen Chishitsu
Source:Shigen Chishitsu, 44( 3(245)), p.155-171. Publisher: Nihon Shigen Chishitsu Gakkai - Society of Resource Geologists of Japan, Tokyo, Japan. ISSN: 0918-2454
Publication Date:1994
Note:In Japanese with English summary. 34 refs.; illus., incl. 7 tables, geol. sketch maps
Summary:The gold mineralization occurs in massive silicified bodies hosted by Neogene andesitic rocks. Three silicified ore-bodies in the mine area are distributed linearly along a NNE-SSW direction and appear to be controlled by the existing regional stress field of southern Kyushu. The deposit has a mushroom shape with an area of 300 × 200 m and is ∼ 270 m thick. It is composed of leached vuggy and/or compact silicified rock enveloped by a narrow argillic zone with kaolinite, dickite, smectite and alunite. The dominant ore minerals are pyrite, goethite, luzonite and native gold. NE-SW fractures are closely related to the orebodies with high Au grade. Gold mineralization may have been formed by neutralized and low saline fluids after the silicification stage, which is characterized by more acid fluids. An exploration program aimed at NE-SW trending fractures led to the discovery of No. 4 orebody. [Y.K.]
Sections:Economic minerals and ore deposits
Subsections:Metallic deposits: specific
Subjects:Fluid inclusions; Gold ores; Hydrothermal alteration; Inclusions; Massive deposits; Metal ores; Metasomatism; Mineral deposits, genesis; Mineralization; Ore-forming fluids; Asia; Far East; Japan; Kagoshima Japan; Kyushu; Satsuma Peninsula; Akeshi Deposit; Hydrothermal processes
Coordinates:N311500 N311500 E1302000 E1302000
Abstract Numbers:01M/227
Record ID:1996058031
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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