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Ephitermal gold-silver-tellurides deposit of cineam, Tasikmalaya District, West Java Indonesia

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Study on epithermal gold and silver deposits which is located at the Cineam area, Tasikmalaya has given a new perspective, particularly in term of mineralization zone occurring in the eastern ofsouthern West Java Mountain Range.
Geologically, the deposits are hosted by Oligo - Miocene Jampang Formation
volcanic rock which principally consist ofandesitic to basaltic lava, volcanic breccia and andesitic to dacitic tuf.f
Alteration and mineralization were typified by the presence of a number ofgold•
silver and base metal mineral bearing quartz veins, that caused kaolinization,
propylitization, argilitization and silicification within the host rocks itself. Gold and silver as electrum are intimately associated with sulfide minerals such as sphalerite, galena, chalcopyrite, stibnite and telluride minerals like hessite (AgTe) and petite (AuAg·Te). The average gold bearing quartz veins range from a few cm to 20 cm in thickness with high grade one (contain visible gold) less than 5 cm
Mineralogy and paragenesis studies indicate that the mineralization is principally
divided into two main stages; first stage is situated in the northern area (Ckondang), and the second stage consisting of 7 substages , occupiesy the central area (Ctambal + Cikurawet) and southern area (Cseel). Gold is particularly formed at stage I and substage I and III of stage II whereas tellurium bearing mineral, hessite (Ag»Te) and petite (AuAgTe) are only present within substage III ofstage II.
The most important and interestingthing is the presence of telluride group
mineral ,which was though as mineral guidefor gold precipitation. On the other hand, a number of fahlor (tetrahedrite group), Ag-As-Sb group (proustite+ pyrargyrite), Arsenic group (realgar and orpiment) minerals are also found as new additional minerals for the deposit.
According to mineralogy and paragenesis, 3 (three) areas of mineralization have been classified, viz Ckondang, for shallow environment (Stibnite and realgar as guide minerals), Citambal and Cseelfor the deeper environment (typified by arsenopyrite).
Fluid inclusion studies show that the homogenization temperature are formed
from about 200C to 22C with boiling inclusion 210"C, and salinity ranges from 1.65 to
2.35 wt % NaCL equiv. Calculation according to Haas formula (1971), indicates the
mineralization formation at the central and southern part occurred 200 -- 350 meters, in depth, beneath the paleosurface
Mineralizing ages determination using K-Ar dating inicates that the mineralization and alteration events are getting youngerfrom the north to the south to be
13.5 to 8. 0 Ma (Miocene).

The final result of the latest studies which is conducted at this area has verified, that the raise of new minerals from telluride, fahlors, Ag-As-Sb and arsenic groups which are combined with K-Argon dating and fluid inclusion studies has given a new perspective with respect to mineralization genesis in this region, particularly in connection with the concept of exploration model in the southern of the West Java Mountain Range region.

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

PK No. 96

Penerbit

Bandung : Direktorat Sumber Daya Mineral., 1998

Deskripsi Fisik

26p.,ill. 14 x 21 cm

Bahasa

English

ISBN/ISSN

0216-0765

Klasifikasi

NONE

Tipe Isi

text

Tipe Media

unmediated

Tipe Pembawa

other (unmediated)

Edisi

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Subjek

Gold
silver
Cineam

Info Detail Spesifik

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Pernyataan Tanggungjawab

Direktorat Sumber Daya Mineral

Informasi Lainnya

Kode Wilayah

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Pulau Dan Lembar Peta

Lainnya

Provinsi

Sumatera Utara

Koordinat - Latitude

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Koordinat - Longitude

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Versi lain/terkait

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