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Potential of some industrial minerals in Indonesia

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Industrial minerals in Indonesia are widely distributed, although in some cases the deposits are not sufficiently abundant to be exploited in large scales. The Directorate of Mineral Resources is assigned to conduct mineral explorations and inventories, and has a long experience on these jobs. The mineral deposits will be discussed include bentonite, kaolin, natural zeolite, diatomite, feldspar, limestone, dolomite, silica, precious and dimension stones, phosphate, perlite, pumice, toseki and pyrophylite. Almost all of Indonesian bentonites belong to the bleaching grades. They are mostly derived from devitrivication of the Miocene vitric tuffs by alteration or diagenetic process. They occur together with the natural zeolite and diagenetic feldspar fanning a zonal distribution. While kaolin occurs in two types, i.e. primary and secondary deposit. The fonner is derived from in-situ alteration of Jurassic granites, while the later is derived from reworking of altered granites dan deposited within the Quarternary sedimentary rock formations. Most of kaolins belong to the ceramic grades and more rarely the paper grades. Silica sands are widely distributed in Indonesia, mostly within the quarternary deposits or older. Diatomite mainly associates with the quaternary basins along the volcanic belts. Limestone and dolomite occur together in the same formation, but dolomite is less abundant, because it derived from dolomitization of limestone. Limestone is now utilized by l O cement factories with total production of about 14 millions ton/year, while dolomite is utilized just for soil conditioner. Feldspar occurs in three types, i.e. primary, diagenetic and alluvial deposit. Primary deposits associate with the granitic or other feldspar-beraing rocks, but no mining have been recorded other than diagenetic deposit. Constrnction and dimension stones are widely distributed, consisted of sands, gravels and pebles. granite and marble with lesser amount of sandstones and tuffs. Precious stones found in Indonesia consist of diamond, amethyst, opal, chrysophrase, agate, jasper and various chalcedonies, garnet, and jade.

There are no accurate statistical data on the production, consumption, export and import of industrial minerals, except limestone for cement raw materials. Although several industrial minerals in Indonesia have good qualities, but the same minerals or their products are still imported. However, industrial minerals in Indonesia have good prospect being developed.

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

PK No. 74

Penerbit

Bandung : Direktorat Sumber Daya Mineral., 1995

Deskripsi Fisik

46p.,ill. 14 x 21 cm

Bahasa

English

ISBN/ISSN

0216-0765

Klasifikasi

NONE

Tipe Isi

text

Tipe Media

unmediated

Tipe Pembawa

other (unmediated)

Edisi

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Subjek

Minerals
pyrophylite
Silica sands

Info Detail Spesifik

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Pernyataan Tanggungjawab

Direktorat Sumber Daya Mineral

Informasi Lainnya

Kode Wilayah

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Pulau Dan Lembar Peta

Lainnya

Provinsi

Sumatera Utara

Koordinat - Latitude

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Koordinat - Longitude

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Versi lain/terkait

Lampiran Berkas