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Modern Mining ›› 2022, Vol. 38 ›› Issue (11): 148-.

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Mineralogical Characteristics of Epithermal Hydrothermal Type Gold Deposit in Ciemas，Indone⁃ sia

ZONG Qingxin1 HU Jiakun1 WU Wei2 XIAO Jingshan1   

  1. In order to clarify the metallogenic geological conditions of the Ciemas gold deposit，a comprehensive study of mineralogy，electron probe and mineral inclusions was carried out for the problems of ore mineral assemblage，element distribution characteristics and fluid inclusions. The results show that the ore mineral assemblages include natural gold，pyrite，arsenopyrite，chalcopyrite，stibnite，galenite and pyrrhotite. The alteration is mainly silicification，sericitization，pyritization，epidote and argillization. Gold is closely related to pyrite and arsenopyrite，pyrite Fe，S are depleted，relatively more depleted Fe， cobalt-nickel ratio average 13.25，Co content is much greater than Ni ; the temperature of the main oreforming period is 240~320 ℃，and the initial ore-forming depth is 0.33~1.73 km. The hydrogen and oxy⁃ gen isotope characteristics show that the ore-forming fluid is mainly derived from primary magmatic water and a small amount of atmospheric precipitation. The ore of the deposit has typical characteristics of lowtemperature hydrothermal mineral assemblage. The deposit may be caused by the superposition of horn⁃ blende quartz porphyry construction. The metallogenic conditions of the deposit conform to the general char⁃ acteristics of epithermal gold deposits.
  • Online:2022-11-25 Published:2023-05-17

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Abstract: mineralogy，epithermal hydrothermal，Ciemas gold deposit，Indonesia