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Journal : Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)

FLUID INCLUSION CHARACTERISTICS OF AURIFEROUS ARINEM AND BANTARHUNI QUARTZ VEINS, ARINEM, WEST JAVA, INDONESIA Yuningsih, Euis Tintin
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 6 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

A microthermometric study of fluid inclusions were carried out on the samples from the epithermal gold-silver-base metal mineralization of Arinem and Bantarhuni veins of Arinem deposit from different levels, stages and minerals types (quartz, sphalerite and calcite) to understand the characteristics of the fluid inclusions trapped, and to determine the physical and chemical environments of ore mineral deposition. The results of primary fluid inclusions measurement of stages I and II of main ore mineralization revealed that Arinem and Bantarhuni quartz veins are in the average range of 194.0º–267.3ºC, and sphalerite samples are 194.1º–241.2ºC. The measurement indicates a general decrease of temperature with decreasing depth and an increasing paragenetic time. The evidence of boiling was measured from substage IA of the Arinem vein with the filling temperatures of these inclusions range from 216.8º–247.3ºC. Under such condition, with an average fluid density of 0.861 g/cm3 and a pressure of about 21.7 bars, the paleo-depth would have about 235 meters. Fluid inclusions assemblages from main stages I and II from all levels commonly show a narrow range in Tm values (0.18–4.43 wt.% NaClequiv.). This is also marked in fluid inclusions assemblages from late stage (stage III) of barren quartz (0.35–3.87 wt.% NaClequiv.). Raman spectroscopic analyses of CO2, N2, H2S and CH4 on selected fluid inclusions of the Arinem vein samples, shows no volatile components other than H2O.Keywords: Arinem, Bantarhuni, fluid inclusion, microthermometry, quartz, salinity.
Karakteristik Jasper Merah di Pulau Jawa Bagian Selatan Berdasarkan Analisis SEM dan XRF Wijayanti, Kemala; Rosana, Mega Fatimah; Yuningsih, Euis Tintin; Sulistyawan, Raden Isnu Hajar
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 1 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

Jasper is one type of microcrystalline silica which include to gemstone variety. Indonesia has a high potential of jasper because its variety and a huge number of jasper that widely spread in Indonesia. There are 3 (three) types of jaspers that usually found in Indonesia, red jasper, yellow jasper, and green jasper. Among three of them, red jasper is much more abundant especially in Southern Java.Therefore, this research was held to observe the differences of red jasper's characteristic in three places in Java, i.e., Bungbulang – Garut, Samigaluh – Yogyakarta, and Donorojo – Pacitan areas. To attain the purpose of this research, SEM analysis is used to compare their textures and XRF for the chemical compositions.The research concludes that the red jaspers from those three places have the same texture, the granulated texture which derived from quartz texture. The grain size seems to increased from west to east. From the chemical composition it can be seen that the red color of jasper is strongly affected by Fe, Cr, and V. The Ti elements of red jasper also increased from west to east because there is a high Ti content in Pacitan's red jasper and perhaps by the combination of those elements resulting the purple color in red jasper.Keywords - red jasper, gemstone, composition, element, Southern Java
COMPOSITIONAL VARIATIONS OF Au-Ag TELLURIDE MINERALS OF ARINEM DEPOSIT, WEST JAVA Yuningsih, Euis Tintin
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 3 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The epithermal Arinem veins system of gold-silver-base metal mineralization is located in the Arinem area in the southwestern part of Java Island, Indonesia. The veins are composed predominantly of quartz+calcite±illite±kaolinite with variable amount of manganese oxide and limonite and high amount of sulfides. The deposit contains a number of Te-bearing minerals, notably tellurides and tellurosulfide minerals. The tellurium mineral assemblages in the Arinem and Bantarhuni veins are similar in the presence of hessite (Ag2Te), petzite (Ag3AuTe2), stutzite (Ag5Te3), tetradymite (Bi2Te2S) dan altaite (PbTe). The tellurium mineral assemblages vary from sample to sample and most of the observed telluride occurrences consist of at least 2 different phases (e.g. petzite-hessite, tetradymite-hessite, petzite-hessite-altaite). Gold concentrations measured in Te-mineral of petzite from the Arinem vein are in the range between 14.24 to 18.32 wt%. Some hessite and stutzite contain gold up to 3.48 and 1.10 wt%, respectively. Some of electrums are present as inclusions in Te-mineral patches in both veins.Keywords : Electrum, petzite, sulfide, tellurides, Arinem, Bantarhuni
Geokimia Endapan Nikel Laterit di Tambang Utara, Kecamatan Pomalaa, Kabupaten Kolaka, Provinsi Sulawesi Tengara Indra Kusuma, Riko Ardiansyah; Kamaruddin, Hashari; Rosana, Mega Fatimah; Tintin Yuningsih, Euis
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 2 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (232.392 KB) | DOI: 10.33332/jgsm.geologi.20.2.85-92

Abstract

Pomalaa is administratively located in Kolaka Regency, Southeast Sulawesi Province. The nickel mining business area in Pomalaa is managed by State-Owned Enterprises and Private Enterprises. Pomalaa is a sub-district that has natural resources in the form of nickel. Nickel Laterite deposits is a result weathering of ultramafic rock that is leaching process and accumulates in the supergen enrichment zone. The lateritization factor is controlled by lithology, morphology, and structure. In general, the profile of laterite nickel deposits in the North Mine area from top to bottom consists of top soil, limonite, saprolite, and bedrock zones. The laterite nickel precipitate in the North Mine shows varying thickness, based on color, texture, size and mineral composition. Laterite deposits from drilling results reaches an range of 25 - 30 meters. Soil and rocks sampling from each laterite zone every meter resulting from drilling are carried out by laboratory testing using XRF (X-Ray Fluorescence) analysis method with 283 total sample. High Ni element show enrichment in the saprolite zone, whereas in the high Fe (iron) element in the limonite zone.Keywords: nickel, laterite, geochemical, Pomalaa
Co-Authors Adi Hardiyono -, Adi Hardiyono Agus Didit Haryanto Agus Didit Haryanto -, Agus Didit Haryanto Ahadi Ahmat Lamburu Akhmad Fauzan Al Adawiah, Nabila. Anna Yushantarti, Anna Arie Noor Rakhman Arief Nur Muchamad Asep Nurdin, Asep Asri Arifin Aton Patonah, Aton Bensaman, Benny Bensaman, Benny. Boy Yoseph Cahya Sunan Sakti Syah Alam DEWI FITRIANI Dewi Gentana Dicky Muslim Electricia, K.S. Emi Sukiyah F, Kurnia. Arfiansyah F. G, Aiwoy Fachrudin, Kurnia Arfiansyah Faizal, Reza Mochammad Faizal, Reza Mochammad Fivry Wellda Maulana Gentana, Dewi Gentana, Dewi Gentana, Dewi Haris Siagian Hashari Kamaruddin Heriawan, Mohammad N Heru Sigit Purwanto Hiroharu Matsueda Hiroharu Matsueda Hiroharu Matsueda Hutauruk, Gita Agnes Meilani Ildrem Syafri Imam Santosa Indra Kusuma, Riko Ardiansyah Indrakususma, Riko Ardiansyah Indrakususma, Riko Ardiansyah Ismail, Fajar Kamaruddin, Hashari Kamaruddin, Hashari Kemala Wijayanti, Kemala Kurnia Arfiansyah, Kurnia Matsueda, Hiroharu Matsueda, Hiroharu Mega F. Rosana Mega F. Rosana, Mega F. Mega Fatimah Rosana Mega Fatimah Rosana Mega Fatimah Rosana Mega Fatimah Rosana -, Mega Fatimah Rosana Meiriyanto, Fernandy Mohamad Nur Heriawan Nada Salsabila Deva Nana Sulaksana Nana Sulaksana Purbiyantoro, Aldila Jasmine Purwaiswanto, Bambang Antoro Raden Isnu Hajar Sulistyawan, Raden Isnu Hajar Riko Ardiansyah Indra Kusuma Rinawan, Fiandri Indra Rinawan, Fiandri Indra Rinawan, Fiandri Indragunawan Rinawan, Fiandri Indragunawan Rompo, Ahmad Iryanto Rompo, Iryanto Rosana, M.Sc., Ph.D, Prof. Ir. Mega Fatimah Rosana, M.Sc., Ph.D, Prof. Ir. Mega Fatimah Rosana, Mega F. Rosana, Mega Fatimah Ruswanto, . Saala, Nur Afrianti Santoso, STJ Budi Saputra, Dwie H. Selasian Gussyak Soepriadi, Soepriadi Soepriadi, Soepriadi Sulaksana, Nana Sutopo, S.T., Dipl. Geoth. En., P, Bronto Sutopo, S.T., Dipl. Geoth. En., P, Bronto Tampubolon, Armin Triyunita, Ade Viqnoriva, S.N. Wirdan, Muhammad Faisal Yuano Rezky, Yuano Zufialdi Zakaria, Zufialdi