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Hishikari Gold Mineralization: A Case Study of the Hosen No. 1 Vein Hosted by Basement Shimanto Sedimentary Rocks, Southern Kyushu, Japan

By
Eiji Izawa
Eiji Izawa
Department of Earth Resources Engineering, Kyushu University, Fukuoka 812-8581, Japan
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Jiro Etho
Jiro Etho
Department of Earth Resources Engineering, Kyushu University, Fukuoka 812-8581, Japan
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Misuzu Honda
Misuzu Honda
Department of Earth Resources Engineering, Kyushu University, Fukuoka 812-8581, Japan
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Yoshinobu Motomura
Yoshinobu Motomura
Department of Earth and Planetary Sciences, Kyushu University, Fukuoka 812-8581, Japan
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Ryota Sekine
Ryota Sekine
Hishikari Mine, Sumitomo Metal Mining Co., Ltd., Kagoshima Prefecture, 895-2701, Japan
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Published:
January 01, 2001

Abstract

The Hishikari high-grade low-sulfidation epithermal gold deposit is located in the Hokusatsu district, about 30 km north of the Kagoshima International Airport, Kagoshima Prefecture (Fig. 1). In early 1981, a narrow (15 cm) but high-grade (290 g/t Au) vein was discovered 200 m below the surface by the Metal Mining Agency of Japan (MITI, 1982), and subsequent development has proved Hishikari to have substantial reserves of high-grade ore. Production from July 1985 to March 2000 totaled 105 tonnes (t) of gold and 58 t of silver from 1.87 Mt of ore. The production plus total reserves are estimated to be 5.5 Mt, including 3.5 Mt at an average grade of 60 to 70 g/t Au in the Honko-Sanjin ore zone and 2 Mt at 20 to 25 g/t Au in the Yamada ore zone, for a total of approximately 260 t of contained gold.

The Hishikari deposit, especially the Honko-Sanjin zone, is characterized by high gold contents in almost all veins and by a very high aluminum content in the veins due to abundant adularia and common smectite. This article presents a summary of the gold deposit at Hishikari and the detailed mineralogical description of a high-grade vein, the Hosen no. 1 vein, hosted by basement sedimentary rocks.

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Contents

Society of Economic Geologists Guidebook Series

Epithermal Gold Mineralization and Modern Analogues, Kyushu, Japan

Craig A. Feebrey
Craig A. Feebrey
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Toshihiko Hayashi
Toshihiko Hayashi
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Sachihiro Taguchi
Sachihiro Taguchi
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Society of Economic Geologists
Volume
34
ISBN electronic:
9781934969878
Publication date:
January 01, 2001

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