Tulisan ini merupakan suatu kompilasi dari beberapa laporan penyelidikan terdahulu yang telah dilakukan didaerah kalimantan Timur dan Selatan, yang terdapat di Perpustakaan Direktorat Geologi Bandung dan di P.N. Pertamina Jakarta.
In the framework of the ,,iron and project" of the Biro Perantjang Negara, geological investigations on the coal deposits in the Sungup-Selaro region, in the northern part of Pulau Laut (Southeast Kalimantan), were carried out in 1959 by the Geological Survey of Indonesia.
The first information about the occurrence of the minerals in the residency of benkoelen, whitch may be considered as accurate, came from MARSDEN (See bibliography Nr. 5 at the end of this treatise). on the page 168 the aouthor reports, thath from a reliable source in became known to him that (annually?)
the survey started in june, 1917, and was suspended on the 15th of february, 1918, due to illness, on account of which the survey of the concession "Boenian" could not entirely be completed
In order to be able to included the project of a steelworks in the second Five-year Plan (beginning in 1959), Biro perantjang Negara (hereinafter called BPN), after having made an invitation for offers in spring 1955, decided in March 1956 to entrust Westdeutsches Ingenieur-Buro Dr.Rohland KG., Dusseldorf (hereinafter called WEDEXRO) with the task …
pemanfaatan batubara baik sebagai sumber energi primer maupun sebagai bahan baku untuk industri perlu mendapat perhatian yang sunguh-sunguh dari pemerintah.
In the framework of the work entrusted to WEDEXRO in 1958 "the suitability of the sigihan coal for metallurgical purposes was to be determined" and at the same time "it appeared advisable to carry out a critical examination of the state of the sigihan mine".
pada tahun 1979,proyek inventiarisasi dan eksplorasi batubara telah mulai menyelidiki endapan batubara di alimantan timur,di daerah antara samarinda-balikpapan
in the framework of the iron and street project of the biro pranjang negara,geological investigation on the coal deposits in te sungup-salero region in the northen part of pulau laut(southhest Kalimantan),were carried our in the 1958 by the geoogical survey indonesia
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