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PUBLIC Resti Andriani 2021 CHARACTERISTICS OF EPITHERMAL GOLD DEPOSITS 1-PAPER.pdf?
PUBLIC Resti Andriani
This study was aimed at characterizing epithermal gold deposits in Cineam, West Java, Indonesia. The geology of
Cineam is composed of an Oligo-Miocene series of volcanic Jampang formations. The Jampang formation is
composed of Andecitic and Dasitic groups. The volcanic group was invaded by diorite, granodiorite, andesite,
and dacite intrusive. Deposit formations are affected by the faults and anticlines of geology structures.
Underground mining. for gold has been conducted in this region using a simple tunnel cross in the direction of the
vein. Characteristics and modeling deposits were observed using microscopes,reflectance, X-ray fluorescence
spectroscopy (XRF), and inductively coupled plasma mass spectrometry (ICP-MS). Based on a survey, the vein
guartz direction was generally followed from N 330-350” E with a 70—90” dip and a thickness ranging from a
Jew centimeters to 60 cm. Mineralization in the Cineam area comprises gold deposits attributed to andesitic and
dacite intrusions caused by the fault structure. Epithermal type is characterized by presences of gold- and base
metal-bearing guartz vein that occurred in lava and volcanic rocks. Samples were collected at different depths to
determine the profile of the alteration zone. The argillic alteration zone was characterized by mineral illite,
smectite, and chlorite. Gold is associated with sulfide minerals, such as pyrite, chalcopyrite, sphalerite, and
galena.