Geology and development of the Hishikari mine
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概要
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The Hishikari deposit, which is now regarded as one of the best gold mines in the world, was discovered in 1981 during a scout-drilling programme carried out by the Metal Mining Agency of Japan (MMAJ). The original aim of the programme was to explore the target located by geophysical surveys and geological interpretation.<BR>Subsequently, 18 follow-up surface DDHs were carried out by the Sumitomo Metal Mining Co. Ltd., the property owner, and all the holes successfully intersected high grade ores.<BR>In March 1983, the company made an official statement that the potential gold content of the deposit may reach some 120 tonnes as metal with a grade 80 g/t.<BR>The underground development was commenced in December 1982, and the first crosscut intersected the orebody in July 1985.<BR>The purpose of this paper is to describe geological facts so far acquired during extensive exploration and development works. The facts are summarized as follows:<BR>(1) Most of veins show extremely high gold content between 100 m and 0 m above sea level.<BR>(2) The ore deposit is apparently located within the area where a gravity high anomaly and a resistivity low anomaly overlap.<BR>(3) A low resistivity anomaly down to the depth some 30 km from the surface is located by the magnetotelluric survey in a section through the deposit. The anomaly resembels to the one in a typical geothermal area.<BR>(4) A large volume of hot spring water occurs within the vein system itself.<BR>(5) The fissures and veins are likely to develop preferably in brittle rocks (andesite lava, shale, sandstone, etc.) and less in ductile rocks ( argillized. fault zone, clayey tuffs, etc.)
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