Path: TopS1-Final ProjectMining Engineering-FTTM2017

KARAKTERISTIK DAN GENESA MINERALISASI TUNGSTEN DI KECAMATAN SIJUK, KABUPATEN BELITUNG, PROVINSI KEPULAUAN BANGKA BELITUNG

TUNGSTEN CHARACTERISTICS AND MINERALIZATION GENESIS IN SUB-DISTRICT OF SIJUK, BELITUNG REGENCY, PROVINCE OF BANGKA BELITUNG

Undergraduate Theses from JBPTITBPP / 2017-09-27 10:39:06
Oleh : FARAH RIZKA RAHMATIA (NIM : 12113044), S1 - Department of Mining Engineering
Dibuat : 2017-09-20, dengan 1 file

Keyword : Tungsten, Greisen, Pluton Tanjungpandan, Pengamatan Mikroskopis, Pengujian XRD, Pengujian SEM-EDS, Pengujian SEM-Mapping

Dewasa ini, perkembangan teknologi industri turut meningkatkan penggunaan bahan logam, tidak terkecuali logam tungsten. Namun, masih sedikit data dan informasi yang berkenaan dengan sumberdaya dan cadangan logam tungsten di Indonesia. Penelitian dilakukan agar dapat memberikan wawasan terkait karakteristik maupun genesa endapan yang dapat mendorong upaya eksplorasi logam tungsten di masa depan. Sampel daerah penelitian dikelompokkan menjadi badan bijih tungsten, konsentrat dan batuan beku granitik yang berasal dari tambang tungsten berskala kecil. Penelitian dilakukan dengan beberapa metode yaitu pengamatan makroskopis, pengamatan mikroskopis, pengujian XRD serta pengujian SEM-EDS dan SEM- MAPPING. Dari hasil analisis laboratorium tersebut, diketahui karakteristik mineralogi serta komposisi mineralnya dari sampel daerah penelitian. Badan bijih tungsten daerah penelitian terdiri atas mineral wolframit ± felspar, kasiterit, mika dan kuarsa. Mineral mika yang teridentifikasi pada pengujian XRD adalah zinwaldit dan muskovit. Sampel badan bijih tungsten dicirikan dengan besar butir mineral yang kasar sampai sangat kasar. Sampel konsentrat terdiri atas mineral wolframit dan kasiterit yang berbentuk granular dan berukuran sedang sampai sangat halus. Sedangkan, batuan beku granitik didominasi oleh mineral kuarsa dan muskovit yang hadir bersama mineral bijih (wolframit dan kasiterit), topaz, mineral oksida besi, mineral lempung dan mineral mika yaitu zinwaldit. Umumnya mineral pada sampel batuan beku granitik memiliki ukuran yang relatif lebih halus jika dibandingkan badan bijih tungsten. Melalui perbandingan karakteristik mineralogi sampel batuan dengan studi literatur, diduga sampel badan bijih tungsten merupakan bagian dari badan kuarsa (quartz body), sampel konsentrat diduga merupakan hasil pengolahan dari badan bijih tungsten maupun batuan sampingnya dan sampel batuan beku granitik diduga merupakan bagian dari batuan greisen yang ada pada pluton Tanjungpandan yang mengalami mineralisasi hasil greisenisasi. Berdasarkan analisis SEM-EDS dan SEM-Mapping, mineral pembawa bijih tungsten dalam sampel badan bijih tungsten (kode sampel : SP-3) adalah mineral wolframit yang memiliki komposisi campuran Fe dan Mn. Selain itu, unsur tanah jarang juga teridentifiksi dalam sampel tersebut yaitu unsur Eu (Europium), Tb (Terbium) dan Th (thorium). Hanya saja unsur tanah jarang tersebut tidak terdapat sebagai mineral tanah jarang melainkan tersebar dalam mineral lain (wolframit, kasiterit dan klorit).

Deskripsi Alternatif :

Today, the development of industrial technology also increases the use of metal materials, including the use of tungsten. However, data and information related to tungsten deposit resources and reserves are still limited. The study is conducted in order to provide insight related to the characteristics and the genesis of tungsten deposit that could encourage tungsten exploration in the future. Samples of research area, the small scale tungsten mine, are divided into tungsten ore body, concentrate and granitic igneous rock. The research was conducted by several methods, including macroscopic observation, microscopic observation, XRD examination, SEM-EDS and SEM-Mapping examination. From the result of laboratory analysis, mineralogy characteristics and mineral composition of sample could be obtained. The tungsten ore body of the research area consists of wolframite ± feldspar, cassiterite, mica and quartz. Mica mineral which identified by XRD examination is zinnwaldite and muscovite. This sample of tungsten ore body is characterized by its coarse mineral grains. The concentrate sample consists of wolframite and cassiterite which is granular and medium to fine. Whereas, granitic igneous rocks are dominated by quartz and muscovite present with ore minerals (wolframite and cassiterite), topaz, iron oxide mineral, clay mineral and mica mineral (zinwaldite). Minerals’ grains within the granitic igneous rocks are relatively finer than tungsten ore body. Through comparison of mineralogy characteristic of rock samples with literature study, it is assumed that tungsten ore sample is part of quartz body, concentrate sample is allegedly the result of tungsten ore body and its wall rock processing, and granitic igneous rocks is allegedly part of greisen rock which is in Tanjungpandan pluton that undergoes greisenization mineralization. Based on SEM analysis, tungsten ore bearing mineral within tungsten ore body samples (sample code : SP-3) is wolframite having mixed Fe and Mn compositions. Rare earth elements are also identified within the sample SP-3, they are Eu (Europium), Tb (Terbium) and Th (Thorium). However, the elements are found as elements scattered within other minerals (wolframite, cassiterite, and chlorite) instead as rare earth minerals.

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PropertiNilai Properti
ID PublisherJBPTITBPP
OrganisasiS1 - Department of Mining Engineering
Nama KontakUPT Perpustakaan ITB
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NegaraIndonesia
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  • Ir., Teti Indriati, M.T., Editor: Resti Andriani

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