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Asian Gold reserves DB
Hishikari Gold mine (Japan)
      paishanlou gold mine (china)
      gaolong gold mine (china)
      ..................
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  Page 371
 
اولينقبليبعديآخرين
   The orebody is an epithermal gold-silver bearing quartz-adularia vein deposit. The ore veins have been dated as Pleistocene, closely related to the lower andesites of the sequence and the first overlying dacite. They fall within a 2.4 km long and 800 m wide NE-SW trending altered and mineralised corridor. The individual veins are steeply dipping (70 to 90░ NW) and are 300 to 400 m long, composed of crustiform banded quartz-adularia with subordinate smectite. They are generally 1 to 3 m thick, to a maximum of 8 m.
   Hydrothermal alteration within the volcanic hosts can be grouped into four zones, namely a: i) cristobalite-smectite zone (cristobalite and/tridymite with smectite), ii) quartz-smectite zone (quartz with smectite and/or kaolin minerals, with pyrite), iii) a mixed-layer clay zone (chlorite/smectite and/or illite/smectite together with quartz, adularia, calcite, and laumontite) and iv) chlorite-illite (quartz-chlorite-adularia-calcite).

Mining in the Hishikari Gold mine

Close view of underground Hishikari Gold mine
    Chlorite and illite/sericite are the principal alteration minerals surrounding the high grade Honko-Sanjin veins, while the lower grade Yamada vein extends into a smectite-mixed layer clay alteration phase. Mixed layer clays (zone iii) and quartz-smectite (zone ii) form a near horizontal layer of intense argillisation 50 to 100 m above the main mineralisation centre, with an argillic zone at the top consisting of quartz, kaolinite, and pyrite. These are followed by the shallowest and outermost alteration characterised by cristobalite-smectite (zone i), commonly with hydrothermal K feldspar, which in turn grades into unaltered andesite or dacite. The veins only contain a few percent sulphides, including prominent chalcopyrite, sulphosalts, selenides and electrum.
 
 
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