Nissho-Iwai Co., Ltd. and Aso Cement Co., Ltd. carried out the reconnaissance survey of Berau Coalfield in East Kalimantan in order to investigate the development possibility of the coalfield, from the middle of November to the middle of December, 1977, under the Survey permit No. 07/SKIP/SJPM/1977 by the Ministry of Mines, Republic of Indonesia.
The geology of the area is described in blad 30 van de geologische kaart van java by Ludwig (1) Folded and faulted dark concretion bearing shales of the widdle miocene Annualatushorizon are overlain by andesitic bearing tuff and breccia amd puntured by contemporaneus (?) plugs, dikes and small stocks of diorite porphyry and andesite.
Sesuai dengan rentjana pembangunan sementara berentjana kita sekarang ini,memebuka projek2 besar jang mana termasuk projek besi badja.disini kami aturkan satu di antaranya penyelidikan projek besi badja lampung,jang diperintahkan djawatan geologi bandung,pada tanggal 20 oktober 1962
It is Proposed to recover and produce on a commercial basis: a. gypsum, by Precipitation this material from a natural, dilute nut impure sulphuric acid salution throught a reaction with limestone
Pekerjaan eksplorasi batubara yang dilaksanakan pada Triwulan I Tahun anggaran 1976/1977 ini adalah kelanjutan dari pelaksanaan pekerjaan dari tahun anggaran sebelumnya, yaitu eksplorasi batubara di daerah Sapandalam dan Parambahan yang merupakan kuassa pertambangan eksplorasi dari P.N Tambang Batubara Ombilin
the reports mentioned in dr. leithe's expert opinion of may 15, 1956, have also been used for the present report. before the departure of the "wedexro" experts to indonesia a detailed program for the taking of coal samples had been set up.
Indonesia has been known quite a long past for its rich coal deposits. Our company was given a reconnaissance permit in coal Blocks No.I and II in North Kalimantan in February of this year and conducted an on-spot survey in the area.