Tampubolon, Armin
Buletin Sumber Daya Geologi

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THE INDONESIAN TITANIUM DEPOSIT TYPES AND THEIR RESOURCES: THE ASPCETS FOR TITANIUM COMMODITY DEVELOPMENT Tampubolon, Armin
Buletin Sumber Daya Geologi Vol 8, No 3 (2013): Buletin Sumber Daya Geologi
Publisher : Buletin Sumber Daya Geologi

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Abstract

Indonesia has several Titanium deposit types: beach placer, alluvial and lateritic types. The source of Titanium minerals in beach placer is derived from Tertiary Volcanic Rocks.The occurence of alluvial Titanium deposit is closely associated with cassiterite (tin minerals) alluvial in Bangka-Belitung Islands. The source of Titanium minerals (ilmenite) are derived fromweathering on tin mineralization hosted in metamorphic and granitic rocks within uplifted morphology areas. Lateritic Titanium deposits are formed by lateritization process in association with bauxite and nickel in Riau, Kalimantan and Sulawesi Islands. The sources of Titanium are in granitic and metamorphic basement rocks.Java beach placer resources are quite big in tonnage, nearly 50 million tons in total, with significant TiO  contents ranging from 8.91 % to 3.17 %. Beach placer along the south shoreline of Java seems to indicate consistency in their mineralogical and genetic types with relativelyhomogenous in TiO  contents. Sumatra shows significant resources for lateritic Titanium deposit that is up to 107,800,859 tons with 0.5% to 15 % TiO . The quite interesting resources are indicated by very significant TiO average (15%) with the total of 19,243,757 tons of lateritic deposit type in Bintan Island, Riau,Sumatra.  The total resources of beach placer type deposits in Sumatra are much  lower than lateritic ones.Sulawesi has both beach placer and lateritic types where the interesting resources of this island are indicated by quite big resources and significant values in TiO  grades in North Sulawesi; the tonnage is up to 31,400,000 tons with TiO  content average is 9.85 %. On the basis of resources and processing technologies, beach placer deposits in Sumatera,Java and Sulawesi are thought to have potentially economic significance. However, such available resources are needed to upgrade by performing detailed and systematic exploration.Government policies and environment concerns are important aspects for consideration in Titanium commodity development of this country
Penafsiran Tipe Mineralisasi Emas Berdasarkan Data Inklusi Fluida di Daerah Siulak Deras, Kabupaten Kerinci, Propinsi Jambi Tampubolon, Armin
Buletin Sumber Daya Geologi Vol 3, No 1 (2008): Buletin Sumber Daya Geologi
Publisher : Buletin Sumber Daya Geologi

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Abstract

Dengan memanfaatkan data inklusi fluida hasil proyek penyelidikan Pusat Sumber Daya Geologi tahun Anggaran 2006, dicoba ditafsirkan tipe mineralisasi emas di Daerah Siulak Deras, Kabupaten Kerinci, Propinsi Jambi. Tipe endapan emas sangat penting diketahui karena berkaitan dengan potensi endapan emas di daerah ini.Litologi daerah ini terdiri dari andesit, batuan gunungapi, kwarsa porfir dan granodiorit. Petunjuk mineralisasi logam selain berupa ubahan juga ditemukan sulfida logam termasuk logam dasar pada urat-urat kwarsa.Ada dua conto urat kwarsa yang diamati inklusi fluidanya yaitu conto AT/PR1 / 2 /Fi Ujung Ladang yang diambil dari urat kwarsa tekstur “sugary” pada batuan granodiorit dari parit uji (PR 1) dan conto STL/02/R/03/Fi yang diambil dari zona urat pada batuan andesit. Pengamatan dilakukan di Laboratorium LIPI Bandung. Hasil pengukuran mikrotermometri didapatkan Th 129 - 198 o C, Dengan tiga modus pada 129oC, 177oC  dan 198o C, kadar NaCl 1,4 – 2,2 % W, besaran ini mengindikasikan tipe mineralisasi epitermal yang berasosiasi dengan logam dasar.Dari data inklusi fluida ditafsirkan bahwa kedalaman mineralisasi masih cukuptebal oleh karena proses erosi mencapai sekitar 72, 13 meter dari paleo surface. Dengan asumsi mineralisasi memiliki penetrasi hingga kedalaman 400 meter berarti mineralisasi tersisa (terawetkan) atau belum tererosi adalah sekitar 300 meter lebih. Dengan demikian masih relatif cukup tebal sehingga diduga memiliki potensi, karenanyaperlu diselidiki lebih rinci.