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All Journal IJOG : Indonesian Journal on Geoscience Journal of Degraded and Mining Lands Management Jurnal Geomine Jurnal GEOSAPTA Journal TEPAT: Teknologi Terapan untuk Pengabdian Masyarakat Jurnal Penelitian Enjiniring Fakultas Teknik Unhas Indonesian Journal on Geoscience Indonesian Journal on Geoscience Journal of Metallurgical Engineering and Processing Technology Journal of Applied Geology Mining Science and Technology Journal

Sufriadin, Sufriadin

Departemen Teknik Pertambangan, Fakultas Teknik, Universitas Hasanuddin,

Author-ID : 2755259

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Public Health

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Study on mineralogy and chemistry of the saprolitic nickel ores from Soroako, Sulawesi, Indonesia: Implication for the lateritic ore processing Sufriadin Sufriadin; Arifudin Idrus; Subagyo Pramumijoyo; I Wayan Warmada; Akira Imai
Journal of Applied Geology Vol 3, No 1 (2011)
Publisher : Geological Engineering Department Universitas Gadjah Mada

An investigation of mineralogy and chemistry of saprolitic nickel ores developed on ultramafic rock with different serpentinization degree from Soroako, Sulawesi has been conducted using X ray diffraction, thermal analysis, FTIR, and ICP-AES. The implication for the processing of these ores under acidic media was also studied. Weathering of unserpentinized peridotite in the Soroako west block produces saprolitic ore containing minerals such as relict olivine, goethite, quartz, talc with minor serpentine and smectite; whereas the weathered materials overlaying serpentinized peridotite in the Petea area are mainly composed of residual serpentine with lesser chlorite, maghemite, and remnant pyroxene and amphibole. Chemical analysis determined by ICP-AES demonstrates that west ore is higher in Si, Mg, and Ni, as compared to that Petea ore. Conversely, Fe and Al concentrations are higher in Petea ore than in west block ore. SEM-EDX examination reveals that olivine, talc, serpentine and goethite are the Ni-bearing phases occurring in west block ore; while serpentine is the principal host for Ni in the Petea ore. Chemical leaching under sulfuric acid reveals that olivine has highest dissolution rate in the west ore followed by serpentine; while talc, pyroxene, and iron oxides have slow dissolution rates. In contrast, serpentine in Petea ore is easily dissolved and is followed by chlorite; whereas amphibole, pyroxene, and maghemite are difficult to leach. Quartz is present in both ores and it seems to be undissolved during the chemical leaching. It is shown that Ni recovery from Petea saprolitic ore is higher than that of West Block ore.

Low-Sulfidation Epithermal Carbonate-Base metal-Gold Mineralization Hosted by Tertiary Sedimentary Rocks in Bastem Prospect, Luwu District, Sulawesi Island, Indonesia: A Preliminary Study Arifudin Idrus; Irzal Nur; Sufriadin Sufriadin; Fadlin Fadlin; Indra Sanjaya; Rohaya Langkoke
Journal of Applied Geology Vol 5, No 1 (2020)
Publisher : Geological Engineering Department Universitas Gadjah Mada

In Indonesia, gold is typically mined out from epithermal, porphyry and skarn deposit types occurred within volcanic belts along magmatic arc or active continental margin setting. Numerous gold prospects, however, are recently discovered in association with metamorphic and sedimentary rocks. This paper is aimed to discuss a preliminary study on the occurrences and characteristics of the sedimentary rock-hosted low-sulfidation (LS) epithermal gold mineralization in Bastem (Bessengan Tempe) prospect, Luwu district, Sulawesi Island, Indonesia. Detailed geological and hydrothermal alteration mapping was performed to understand the distribution and characteristics of ore mineralization. Representative ore samples taken were analysed for ore chemistry by means of Fire Assay – Atomic Absorption Spectrometry (FA-AAS) and Acid Geochemical Digest - Atomic Absorption Spectrometry (GA-AAS). The results from this work that the Bastem prospect is stratigrapically occupied by Tertiary sedimentary rocks of Toraja formation, which is adjacent to volcanic rocks of Lamasi formation. Gold-bearing quartz±carbonate veins are hosted by mudstone and siltstone of Toraja formation. The quartz-carbonate veins show a typical LS epithermal open space filling texture containing erratic gold grade of up to 7.16 g/t with relatively high besemetals (Pb and Zn) grades of up to >0.4 and >1%, respectively. Based on those various features, the LS epithermal deposit is categorized as “carbonate-basemetal-gold mineralization type”, which might be originated in back arc rift/basin setting. This ‘unconventional’ sedimentary rock hosted-gold mineralization type would be the new target of gold exploration in Indonesia.

Co-Authors A. Ikram Fikriawan A. Imai A. Imai A. M. Imran Agus Ardianto Budiman Akane Ito Akira Imai Angelia Santoso Ansyariah Ansyariah Arga Gautama Arifudin Idrus Aryanti V A Aryanti Virtanti Anas Asran Ilyas Asri Jaya Asta Arjunoarwan Hatta Astina Aras Chairil Sastria Erwin Suhendar Fadlin Fadlin Faiz, Mifta Achmad Fuad Bawazir Halilintar Rangga Swara Hatta, Asta Arjunoarwan I Wayan Warmada I. Nur I. Nur Imai, A. Imai, Akira Indra Sanjaya Indra Sanjaya Irzal Nur Irzal Nur, Irzal Kabangnga, Chrisadna Marchia Kaharuddin Kaharuddin Kaharuddin, Kaharuddin Kenzo Sanematsu Lestari, Ananda Nur Meinarni Thamrin Miftah Hujannah Miftah Hujannah Monika Sroyer Mudinillah, Adam Muh. Firman Babay Muhammad - Ramli Muhammad - Ramli Muhammad Fuad Avicenna Muhammad Rahmatul Jihad Mukhlis, Mukhilis Nanda Pratiwi Rapele Nirmana Fiqra Qaidahiyani Nur Asmiani Nur, I. Nurlia Jafar Parissing, Yoshita P Pramumijoyo, S. Prasetyono, Agus Purwanto - Purwanto Purwanto Purwanto Purwanto Rahmat Sira Reski Fausi Amanda Rini Novrianti Sutardjo Rizki Amalia Rohaya Langkoke Rohaya Langkoke Rony, Zahara Tussoleha S. Pramumijoyo S. Pramumijoyo Saputra, Ridwan Shany Sofiah Fauth Sri Widodo Sri Widodo Sri Widodo Sri Widodo Sri Widodo Sri Widodo Subagyo Pramumijoyo Subagyo Pramumijoyo, Subagyo Tsubasa Otake Umar Triadi Rivai Widodo sri William, Gabriel Wendiarto Yulinaus Mendaun

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