Mineralogy and Ore Characteristics of the Kujang Pb-Zn Skarn Deposit, Sukabumi Regency, West Java

Eka Harris Suryawan; Arifudin Idrus; Imam Suyanto; Ilham Ilmawan; M.Dzulfikar Faruqi

doi:10.22146/jag.78105

Mineralogy and Ore Characteristics of the Kujang Pb-Zn Skarn Deposit, Sukabumi Regency, West Java

https://doi.org/10.22146/jag.78105

Eka Harris Suryawan^(1*), Arifudin Idrus⁽²⁾, Imam Suyanto⁽³⁾, Ilham Ilmawan⁽⁴⁾, M.Dzulfikar Faruqi⁽⁵⁾

(1) Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta
(2) Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta
(3) Department of Physics, Universitas Gadjah Mada, Yogyakarta
(4) PT. Generasi Muda Bersatu, Jakarta
(5) PT. Generasi Muda Bersatu, Jakarta
(*) Corresponding Author

Abstract

The Kujang Pb-Zn skarn deposit is known to be the newest skarn deposit found in the Sunda-Banda magmatic arc. The skarn orebodies are mostly hosted by limestone which might be the part of the Jampang Formation where dacite porphyry is interpreted to be the ore causative intrusion. Orebodies are mostly found at the contact between marbleized limestone and volcanic rocks and are controlled by NW-SE-trending strike-slip faults. Previous research on the mineralogy and ore characteristics of the Kujang Prospect remains limited on the preliminary studies. Using fieldwork data, petrography, ore microscopy, and assay data from core samples, this study is aimed to characterize the mineralogy of both alteration and ore of the deposit. The alteration of the Kujang Prospect skarn can be divided into 2 phases of alteration i.e. prograde and retrograde. The prograde alteration is characterized by the occurrence of clinopyroxene, wollastonite, and vesuvianite. Garnet is present in very rare amounts. the retrograde alteration is typified by epidote, chlorite, calcite and actinolite. Metalliferous minerals are represented by sphalerite, galena, pyrrhotite, chalcopyrite and pyrite. All ore minerals are formed at the early retrograde stage. the deposit’s average grade is 2.06% Pb, 6.45% Zn and 1.81% Cu.

Keywords

mineralogy and ore characteristics; skarn deposit; Sukabumi.

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DOI: https://doi.org/10.22146/jag.78105