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Journal : Journal of Geoscience, Engineering, Environment, and Technology

Metamorphic rock-hosted orogenic gold deposit style at Bombana (Southeast Sulawesi) and Buru Island (Maluku): Their key features and significances for gold exploration in Eastern Indonesia Idrus, Arifudin; Prihatmoko, Sukamandaru; Harjanto, Ernowo; Meyer, Franz Michael; Nur, Irzal; Widodo, Wahyu; Agung, Lia Novelia
Journal of Geoscience, Engineering, Environment, and Technology Vol 2 No 2 (2017): JGEET Vol 02 No 02 : June (2017)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1215.235 KB) | DOI: 10.24273/jgeet.2017.2.2.291

Abstract

In Indonesia, gold is commonly mined from epithermal-, porphyry-, and skarn-type deposits that are commonly found in volcanic belts along island arcs or active continental margin settings. Numerous gold prospects, however, were recently discovered in association with metamorphic rocks. This paper focuses on metamorphic rock-hosted gold mineralization in Eastern Indonesia, in particular the Bombana (SE Sulawesi) and Buru Island (Maluku) prospects. At Bombana, gold-bearing quartz-veins are hosted by the Pompangeo metamorphic complex. Sheared, segmented veins vary in thickness from 2 cm to 2 m. Gold is mainly present in the form of ‘free gold’ among silicate minerals and closely related to cinnabar, stibnite, tripuhyite, and in places, minor arsenopyrite. The gold distribution is erratic, however, ranging from below detection limit up to 134 g/t. At least three generations of veins are identified. The first is parallel to the foliation, the second crosscuts the first generation of veins as well as the foliation, and the late-stage laminated deformed quartz-calcite vein represents the third mineralization stage. The early veins are mostly massive to crystalline, occasionally brecciated, and sigmoidal, whereas the second-stage veins are narrower than the first ones and less subjected to brecciation. Gold grades in the second- and third-stage veins are on average higher than that in the earlier veins. Microthermometric and Raman spectrometric studies of fluid inclusions indicate abundant H2O-NaCl and minor H2O-NaCl-CO2 fluids. Homogenization temperatures and salinities vary from 114 to 283 ºC and 0.35 to 9.08 wt.% NaCl eq., respectively. Crush-leach analysis of fluid inclusions suggests that the halogen fluid chemistry is not identical to sea water, magmatic or epithermal related fluids, but tends to be similar to fluids in mesothermal-type gold deposits. In Buru Island (Gunung Botak and Gogorea prospects), two distinct generations of quartz veins are identified. Early quartz veins are segmented, sigmoidal discontinuous and parallel to the foliation of the host rock. This generation of quartz veins is characterized by crystalline relatively clear quartz, and weakly mineralized with low sulfide and gold contents. The second type of quartz veins occurs within the ‘mineralized zone’ of about 100 m in width and ~1,000 m in length. Gold mineralization is intensely overprinted by argillic alteration. The mineralization-alteration zone is probably parallel to the mica schist foliation and strongly controlled by N-S or NE-SW-trending structures. Gold-bearing quartz veins are characterized by banded texture particularly following host rock foliation and sulphide banding, brecciated and rare bladed-like texture. Alteration types consist of propylitic (chlorite, calcite, sericite), argillic and carbonation represented by graphite banding and carbon flakes. Ore mineral comprises pyrite, native gold, pyrrhotite, and arsenopyrite. Cinnabar and stibnite are present in association with gold. Ore chemistry indicates that 11 out of 15 samples yielded more than 1 g/t Au, in which 6 of them graded in excess of 3 g/t Au. All high-grade samples are composed of limonite or partly contain limonitic material. This suggests the process of supergene enrichment. Interestingly, most of the high-grade samples contain also high concentrations of As (up to 991ppm), Sb (up to 885ppm), and Hg (up to 75ppm). Fluid inclusions in both quartz vein types consist of 4 phases including L-rich, V-rich, L-V-rich and L1-L2-V (CO2)-rich phases. The mineralizing hydrothermal fluid typically is CO2-rich, of moderate temperature (300-400 ºC), and low salinity (0.36 to 0.54 wt.% NaCl eq). Based on those key features, gold mineralization in Bombana and Buru Island tends to meet the characteristics of orogenic, mesothermal types of gold deposit. Metamorphic rock-hosted gold deposits could represent the new targets for gold exploration particularly in Eastern Indonesia.
Co-Authors A.A. Ketut Agung Cahyawan W Abd. Rohman Abdillah, Bagas Abdul Hafidz Abdul Majid Achmad Arifulloh, Achmad Achmad Fauzi Kamal Adi Susanto Adi Sutanto Adly, Emil Agnita Siska Pramasdyahsari, Agnita Siska Agus Arifin, Agus Agus Sutono Ahmad Muzaki ahmad yani Ahmad Yudianto Aini, Sindi Nur Aisyah, ⁠Siti Nurul Akhirul Aminulloh al-Jaberi, Mushir Abdul Wahid Alfi Azizah Alies Poetri Lintangsari Aljaberi, Abdulwahid Andy Rachman Anggoro, Windika Yanuar Ani Hairani, Ani Anisatul M., Siti Anita Rahmawati Anna Nur Nazilah Chamim Antarianto, Radiana Dhewayani Aprilia, I.T. Apriliana Devi Anggraini Aprilya, Dina Aria Kekalih Arif Pujiyono Arifudin Idrus Aris Winaya Arum, Julia Puspita Astutik, Iin Dwi Aulia, Rifdah Ayudha, Nora Titahning Ayun, Qurratu Baharuddin Ahmad, Baharuddin Barthos, Megawati Bayu Etti Tri Adiyastiti Boy Nurdin Burhan Barid Caesarani, Sarah Cahyadi, Andhi Cahyati, Martyana Dwi Canintika, Anissa Feby Chandra Adi Prabowo, Chandra Adi Choiri, Moh Miftachul Chusnul Chotimah Citaningati, Putri Rizka Citra Y., Nisye Dafiyanti , Aprilia Danar, Danar Dany Ardhian Darmawan, Rizki Piet Dasrizal Dasrizal Dasumiati Dasumiati Department, administratio Dewi, Putri Kumala Diantoro, Fery Djaja Surya Atmadja Dwi Rachmawati Efriyani Sumastuti Elsye Maria Rosa Endayani, Endayani Ende, Ende Ernowo Ernowo Harjanto, Ernowo Eti Setiawati, Eti Evi Yulia Purwanti Evi Yulia Purwanti Fachry Abda El Rahman Fajar Surya Ari Anggara, Fajar Surya Ari Farhanto, Aliif Satyo Farida Farida Farida, Vetriana Nur Fasya Zahra Fauziyyah Ramdani Fatmawati Fatmawati fatoni, malik Febry Wijayanti Fiolin, Jessica Firmansyah Firmansyah Fitri Octaviana Franz Michael Meyer, Franz Michael FX Sugiyanto Galang Windi Pratama, Toebagus Galang Windi Pratama, Toebagus Hamidah . Hanacendekia, Syifa Hardiyanti, Marzellina Harefa, Mei Brilian Harwin Harwin, Harwin Haryono Haryono Haryono, Aulia Hammidah Hasan Basri Herdiman, Joshua Alward Heri Suroto Herkutanto Hermawati, Kiki Ayu Huda, M. Bahrul I Made Gery Inggrayana, I Made Gery I Nyoman Sudana Degeng Idayu, Riyanthi Iin Dwi Astutik Imam Ahmad Imanuel Hitipeuw Imbang Dwi Rahayu Indah Prihartini Indah Wahyuningrum Irzal Nur, Irzal Ishaq, Ubaidilah Ismail Hadisoebroto Dilogo Istiningsih, Istiningsih Iswanto, Enrico Dwiki Jaka Wijaya Kusuma Jati Isnawang, Jalu Sancoko Jayawarsa, A.A. Ketut Jazaul Ikhsan Julia Puspita Arum Juristo, Juristo Karsinah - Kartika D., Mega Khairunnisak Khairunnisak, Khairunnisak Khoiriya Latifah, Khoiriya Komala, Messayu Dara Krida, Graha Wira Kurniasari, Novita Kusuma, Trio Yonathan Teja Laila Indra Lestari LENI TRIANA, LENI Leonardo Lia Novelia Agung, Lia Novelia Luis Fiska Rahayu Luky Agus Hermanto, Luky Agus Ma'arif, Muhamad Syamsul Mahfudah, Siti Nazihah Maizayanti, Maizayanti Mamay Komarudin Marhamah, Aliatun Marthen Pali, Marthen Maryadi Maryadi Marzellina Hardiyanti Maulidya, Anggi Lelia Meri Susanti Mochammad Imron Awalludin Mochlis, M. Moh. 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Said, Faridah Mohd Said Salmah, Ummy Salsabila, Unik Hanifah Sapto Budoyo Saputra, Ilham Rizki Saputri, Estining Galih Satriawan, Bunsa Jondan Sayyid, Farida Muhad Sefriyandi, Andi Setiawan, Wahid Nur Setioko, Sigit Setyawan, Apriaji Shanty Oktavilia Shokhwatunnisa Sindi Nur Aini Sintia, Bella Siti Fatonah Soeprijanto, Troeboes Sofyani, Fitri Sony Sukmawan, Sony Sri Mulyani Sudarman Mersa Sugiharto, Ade Firmansyah Sugiyanto Suherman Arifin Sukamandaru Prihatmoko, Sukamandaru Sulistyowati Sulistyowati Sulystiadi, Eko Sulystiadi, Eko Sunarjo, Anwar Surya Budi Lesmana Susanto, Roni Sutawi Sutawi Suwarno Widodo Suyadi Suyadi Suyatno Suyatno Syahroni, Imam Syahrudin Syahrudin, Syahrudin Toebagus Galang Tri Utari Tri Widodo TRIYUDANTO, ARYO NUGROHO Tukadi Tukadi, Tukadi U.R, Saihah Rofiati Ujang Sumarwan Ukima Nusuki Ulum, M Miftahul Umi Salamah Ummy Salmah Usran Masahere Wahyiah, Ita Rosita Wahyu , Didin Rasyiddin Wahyu, Didin Rasyiddin Wahyudi, Amelinda Kusbandiah Waris.P, Achmad Nur Warsiman Wehandaka Pancapalaga Wicaksana, Tania Wicaksono, Trio Arreza Widodo, Nova Maulud wirasanto, Inang Fausi Wresti Indriatmi B. 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