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Asian Gold reserves DB
      paishanlou gold mine (china)
      gaolong gold mine (china)
      ..................
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  Page 277
 
اولينقبليبعديآخرين
   Geology and Mineralisation
   The Pongkor deposit comprises a swarm of sub-parallel veins striking north-north-west to south-south-east, generally composed of quartz-carbonate and adularia and set in volcanic host rocks of Tertiary age. Most commonly the mineralised veins occur within a subaerial volcanic lapilli tuff of andesitic composition.

area geology map
    The gold occurs as electrum, an alloy of gold and silver, in which the gold content varies 48% to 74%. Associated minerals are pyrite and silver sulfosalts (acanthite, aguilarite, pearcite-polybasite) and rare amounts of sphalerite, galena, chalcopyrite and traces of hessite; in general the mineralisation is low in sulphides. This is an epithermal deposit interpreted to have formed on the north-western rim of a collapsed caldera associated with the Bayah Dome, a feature on the volcanic arc of the Sunda Orogenic Belt, which marks a major tectonic subduction zone.
  
  
 
 
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