Kebutuhan akan felspar, sienit nefelin dan mine• ral - mineral felspar lainnya dalam industri keramik, gel as, cat , karet dan plastik dari tahun ke tahun ma• kin mem.ngkat , Pro dukef felspar di .lunia secara ke seluruhan selama tahun 1979 mencapai 3.400.000 ton. Hasil felspar dunia sebagian besar-datang • negara Uni Sovyet, USA,…
Investigations of the acid volcanic rocks in New• Zealand have shown that the must promising perlite deposits are the glassy rhyolites of the Taupo-Rotorua and Tuirua districts. Tl,c Lest-grade rock is at Ongaroto, Maroa, Tairua, and Lake lfotoma. Large quantities …
The Calaveritas quadrangle is in the western foothills of the Sierra Nevada, east of the Mother Lode gold belt. Most of the quadrangle is underlain by a strongly de• formed bedrock complex that is locally covered by small deposits of undeformed stream gravels and rhyolite tuff.
The bedrock complex consists of met…
geochemistry indicated several copper values of grea't'er than 1000 ppm. where the eastern cr o ss l Lne of the soil grid is still open to the ea s t . Follow-up geological work in Ligi was based on the above date focussed attention on Ligi Stream and its tributaries. were started on February 12 and lasted to Harch 26, 1974.…
Quartz sand based on its properties or characteristics could be used in the industry of glass, glass palte, cement, ceramics, metal casting, etc. Indonesia has a large potential of quartz sand with the deposits spread out in 56 locations within 16 provinces in Indonesia. The total reserve ia estimated to amount of 4.48 billion tons. Most to them ar…
Naturally, gypsum occures as a sulphate mineral containing water of crystallization. Gypsum is used widely in industrial, construction and medical sectors. Anhydrite as its name implies is the sulphate without water of crystallization. In addition anhydrite is found in association with gypsum. Recently, domestic gypsum end-users show some sig…
Preliminary studies have shown that a petrochemical project for the manufacture of ethylene and selected ethylene derivatives using an ethane feedstock extracted from natural gas to be produced from the Arun field would b…
Operational Research was born in the chaos of war but h~!,;boon matured in industry and peace. Now approaching manhood it is yet another tool of effective Management, attempting to provide the best decision relative to the information provided. In some circumstances O.R, cannot specify an optimum solution because one.or more…
Since the discovery of Kasim oil field in 1972, some eighty-five wells have been drilled by Petromer Trend in the Salawati Basin. This subsurface information, together with earlier Shell Oil and Pertamina
data, provides a fairly complete picture of basin history with its Miocene reef growth, burial, tilt and subsequent deformation. Until Eocene tim…