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Kamikita |
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Honshu, Japan |
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Cu Zn Pb Ag Au
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
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The Kamikita cluster of kuroko type Cu-Zn-pyrite orebodies are hosted by middle Miocene volcanics in Aomori Prefecture, northern Honshu, Japan.
This part of Honshu is the northern part of the Tohoku Green Tuff Region with a similar Miocene geological history to the Hokuroko Basin 50 km to the south that hosts the largest of the kuroko type deposits. For background information on the geology and setting of the Hokuroko Basin see the Hokuroko Basin - Kuroko Deposits record.
A cluster of at least five ore deposits (each made up of a series of lenses) are hosted by middle Miocene rhyolites and rhyolitic tuff breccias of the Okunosawa formation which correlates with the regional Nishikurasawa Stage, the same stage as the hosts to the deposits of the Hokuroko Basin ores.
Mineralisation is present in a variety of styles, including from lower to higher levels in the system of: 1). Stockwork pyrite, 2). Massive pyrite, 3). Stockwork sphalerite (occurring above or overprinting bedded pyritic ore and always in association with overlying bedded sphalerite rich ore), 4). Bedded, compact, chalcopyrite rich ore, 5). Bedded, compact, sphalerite rich ore, 6). Bedded fragmental ore.
The individual orebodies can be summarised as follows:
* Tteishi - a rhyolite hosted massive sulphide pyritic ore lens of 80x60x80 m with silicification and sericitisation, and a rhyolite hosted massive to layered sulphide Cu-Zn-pyrite lens 120x30x165 m with sericitic alteration, for approximately 1.1 to 1.2 Mt of ore.
* Honko - a rhyolite hosted cylindrical pyritic ore deposit of 40x30x230 m with pyrophyllite and argillitic alteration for approximately 0.6 to 0.7 Mt of ore.
* Kaminosawa - three layered and massive orebodies (250x60x5 m, 40x25x40 m, 500x400x3 m) hosted by rhyolites and tuff breccias with Cu-Zn-pyrite ore and hydromica alteration - for 1.5 to 1.7 Mt of ore.
* Okunosawa - three tuff breccia orebodies - a 170x140x30 m massive sulphide pyritic orebody, a 150x30x40 m massive sulphide Cu orebody and a 40x25x70 m cylindrical Cu-pyrite orebody, for a total of 1.1 to 1.2 Mt of ore.
* Donosawa - a rhyolite hosted layered (300x150x2 m) and massive (50x30x5 m) Cu-Zn-pyrite sulphide ore deposit with sericitic alteration.
For detail consult the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 1975.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Lee M S, Miyajima T, Mizumoto H 1974 - Geology of the Kamikita Mine, Aomori Prefecture, with special reference to genesis of fragmental ores: in Ishihara S (Ed.), 1974 Geology of Kuroko Deposits The Society of Mining Geologists of Japan Mining Geology Special Issue 6 pp 53-66
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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