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All Journal Buletin Sumber Daya Geologi
Herfien Samalehu
Dinas Energi dan Sumber Daya Mineral, Pemerintah Daerah Provinsi Maluku
Education Energy Engineering Environmental Science

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MINERALISASI ENDAPAN SINABAR DAERAH BUKIT TEMBAGA KECAMATAN HUAMUAL, KABUPATEN SERAM BAGIAN BARAT, MALUKU: MINERALIZATION OF CINNABAR DEPOSIT AT TEMBAGA HILL, HUAMUAL DISTRICT, WESTERN SERAM REGENCY, MALUKU Herfien Samalehu; Arifudin Idrus; Nugroho Imam Setiawan
Buletin Sumber Daya Geologi Vol. 17 No. 1 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i1.348

Abstract

Iha – Luhu is located in the western part of Seram Island, Maluku which is placed at an elevation of 9 up to 341 meters above sea level and occupies Taunusa Metamorphic Complex. This study aims to study geological control, mineralization characteristics and ore geochemistry of cinnabar deposit in Iha - Luhu. Research method applies a literature review, fieldwork for sampling, geological mapping, alteration & mineralization and laboratory analysis including polished section, ore geochemistry (FA/AAS and ICP-AES, XRF) and elemental mapping (Micro-XRF). The results showed that characteristics of cinnabar deposits in Iha – Luhu were formed in two type of veins (fracture-related mineralization) and disseminated in metapelites and quartz-muscovite phyllite hostrocks and controlled by NNW-SE and NE- SW trending faults. Mineralization consists of cinnabar (±metacinnabar), arsenopyrite, stibnite, sphalerite, hematite, minor pyrite±pyrrhotite with gangue minerals consisting of quartz, illite, smectite and kaolinite. Cinnabar ore contains an abundance of Zn, Sb, Fe, As, indicating presence of precious metal (gold) and mercury (Hg) content reaching 72.4%.
ALTERASI HIDROTERMAL ENDAPAN SINABAR DAERAH BUKIT TEMBAGA, IHA – LUHU, PULAU SERAM, MALUKU : HYDROTHERMAL ALTERATION OF CINNABAR DEPOSIT IN TEMBAGA HILL, IHA – LUHU - SERAM ISLAND, MALUKU Herfien Samalehu; Arifudin Idrus; Nugroho Imam Setiawan
Buletin Sumber Daya Geologi Vol. 17 No. 3 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i3.357

Abstract

Iha – Luhu area is located in the western part of Seram Island, which is about 59.2 km from city of Piru. Geographically, it is located at 128o0’35” to 128o2’42”East Longitude and 3o20’40” s.d 3o22’05”South Latitude and is included in Huamual sub-district, West Seram Regency, Maluku. Stratigraphy of Iha – Luhu is composed of metapelitic rock and low grade metamorphic lithologies, namely meta quartz – muscovite sandstone units and quartz – muscovite phyllite unit and is unconformaby covered by alluvial deposits. Research area consists of three hydrothermal alteration zones which are mentioned as illite±kaolinite alteration zone, illite±chlorite alteration zone and Illit±smectite±kaolinite alteration zone. Illite±kaolinite alteration zone is characterized by assemblage of clay minerals, presumably illite and kaolinite. This alteration is associated with quartz-muscovite meta-siltstone and dominant occurred to quartz-muscovite meta-sandstone. Intensity of alteration is moderate to strong altered which mainly describing percentage of alteration mineral presence more than 75%. Based on assemblage of kaolinite and illite alteration minerals thus illite±kaolinite alteration zone was formed at temperatures <220o-300o C. Illite±chlorite alteration zone is associated with fracture-related mineralization and disseminated enrichment of cinnabar ore deposits where alteration pattern is a pervasive alteration show. This zone is characterized by presence of mica (illite) clay mineral and chlorite and quartz as well. Illite±chlorite alteration is more dominantly associated with quartz-muscovite phyllite and quartz-muscovite meta-siltstone and spread over in the middle of Bukit Tembaga. Formation Temperature of this alteration zone is estimated at 250o – 300o C. Illite±smectite±kaolinite alteration zone spread widely on top of Bukit Tembaga to lowlands and reaching area of ​​> 9.6 Km2. This alteration covers illite ± chlorite and illite ± kaolinite alterations with pervasive alteration pattern and strong altered alteration. Clay in this zone occurred due to alteration of muscovite/sericite and plagioclase minerals. Presence of smectite in this alteration zone reflects vertical depth that is relatively far from ore zone or at top of formation with temperature tend to be lower than illite and kaolinite minerals. Formation temperature of this alteration zone is estimated at 220o-300o C.
KARAKTERISTIK MINERALISASI CEBAKAN AU±LOGAM DASAR DI TAMILOUW – HAYA, PULAU SERAM, MALUKU: MINERALIZATION CHARACTERISTIC OF AU±BASE METAL DEPOSIT AT TAMILOUW - HAYA, SERAM ISLAND, MALUKU Herfien Samalehu; Arifudin Idrus; Nugroho Imam Setiawan
Buletin Sumber Daya Geologi Vol. 18 No. 1 (2023): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v18i1.400

Abstract

The research area is located in the southern part of Seram Island, Maluku, which is at an elevation of 3 to 675 meters above sea level; is composed of metapelites to low-grade metamorphic rocks, coralline limestone and alluvial deposits. The purpose of this investigation is to study geological control, mineralization characteristics and ore geochemistry of Au±basemetal deposit in Tamilouw – Haya. Investigation activities began with literature review, field investigations for sampling, geological mapping, alteration & mineralization and laboratory analysis which including polish sections and ore geochemistry (FA/AAS). Based on the results of investigation, it shows that mineralization in Tamilouw - Haya is associated with 3 type of veins, namely quartz veins (V1) that parallel to the foliation plane (concordant), quartz veins that cutting through foliation plane (V2) and third generation veins (V3) are quartz ±carbonate veins associated with breccia - stockwork and formed at the end of veins formation. Massive texture is found in most of the veins, especially those with relatively large dimensions. Vein filling minerals are dominated by quartz, sulfide minerals and precious metals while dominant sulfide veins consist of pyrite and arsenopyrite. Metal sulfide mineralizations at Tamilouw – Haya are pyrite, gold, chalcopyrite, sphalerite, galena, pyrhotite, tetrahydrite, tenantite, marcasite, arsenopyrite, sinabar, kalininite and realgar. Gold grades reaching 0.006 to 7.45 ppm.
Co-Authors Arifudin Idrus Arifudin Idrus Nugroho Imam Setiawan